Zions Bancorporation, National Association (ZION) 10-K 29 Feb 16 2015 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 16, 2016	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	zion
Entity Registrant Name	ZIONS BANCORPORATION /UT/
Entity Central Index Key	109,380
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 6,337,925,184
Entity Common Stock, Shares Outstanding		204,506,825

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 798,319	$ 841,942
Money market investments:
Interest-bearing deposits	6,108,124	7,178,097
Federal funds sold and security resell agreements	619,758	1,386,291
Investment securities:
Held-to-maturity, at adjusted cost (approximate fair value $552,088 and $677,196)	545,648	647,252
Available-for-sale, at fair value	7,643,116	3,844,248
Trading account, at fair value	48,168	70,601
Marketable securities, total	8,236,932	4,562,101
Loans held for sale	149,880	132,504
Loans, net of allowance
Total loans, net of unearned income and fees	40,649,542	40,063,658
Less allowance for loan losses	606,048	604,663
Loans, net of allowance	40,043,494	39,458,995
Other noninterest-bearing investments	848,144	865,950
Premises and equipment, net	905,462	829,809
Goodwill	1,014,129	1,014,129
Core deposit and other intangibles	16,272	25,520
Other real estate owned	7,092	18,916
Other assets	921,919	894,620
Total assets	59,669,525	57,208,874
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing demand	22,276,664	20,529,124
Interest-bearing:
Savings and Money Market	25,672,356	24,583,636
Time	2,130,680	2,406,924
Foreign	294,391	328,391
Total deposits	50,374,091	47,848,075
Federal funds and other short-term borrowings	346,987	244,223
Long-term debt	817,348	1,092,282
Reserve for unfunded lending commitments	74,838	81,076
Other liabilities	548,742	573,688
Total liabilities	52,162,006	49,839,344
Shareholders' equity:
Preferred stock, without par value, authorized 4,400,000 shares	828,490	1,004,011
Common stock, without par value; authorized 350,000,000 shares; issued and outstanding 204,417,093 and 203,014,903 shares	4,766,731	4,723,855
Retained earnings	1,966,910	1,769,705
Accumulated Other Comprehensive Income (Loss)	(54,612)	(128,041)
Total shareholders' equity	7,507,519	7,369,530
Total liabilities and shareholders' equity	$ 59,669,525	$ 57,208,874

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Held-to-maturity, fair value	$ 552,088	$ 677,196
Preferred stock, authorized shares	4,400,000	4,400,000
Common stock, authorized shares	350,000,000	350,000,000
Common stock, issued shares	204,417,093	203,014,903
Common stock, outstanding shares	204,417,093	203,014,903

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income:
Interest and fees on loans	$ 1,686,220	$ 1,729,652	$ 1,814,631
Interest on money market investments	23,165	21,414	23,363
Interest on securities	124,086	101,936	103,442
Total interest income	1,833,471	1,853,002	1,941,436
Interest expense:
Interest on deposits	49,344	49,736	58,913
Interest on short- and long-term borrowings	68,867	123,262	186,164
Total interest expense	118,211	172,998	245,077
Net interest income	1,715,260	1,680,004	1,696,359
Provision for loan losses	40,035	(98,082)	(87,136)
Net interest income after provision for loan losses	1,675,225	1,778,086	1,783,495
Noninterest income:
Service charges and fees on deposit accounts	168,451	168,291	171,036
Other service charges, commissions and fees	206,786	193,978	183,961
Wealth management income	31,224	30,573	29,913
Loan sales and servicing income	30,731	29,154	38,113
Capital markets and foreign exchange	25,655	22,584	28,051
Dividends and other investment income	30,150	43,662	46,062
Fair value and nonhedge derivative loss	(111)	(11,390)	(18,152)
Equity securities gains, net	11,875	13,471	8,520
Fixed income securities gains (losses), net	(138,735)	10,419	(2,898)
Impairment losses on investment securities:
Impairment losses on investment securities	0	(27)	(188,606)
Less amounts recognized in other comprehensive income	0	0	23,472
Net impairment losses on investment securities	0	(27)	(165,134)
Other	11,094	7,914	17,904
Total noninterest income	377,120	508,629	337,376
Noninterest expense:
Salaries and employee benefits	972,712	956,411	912,902
Occupancy, net	119,529	115,701	112,303
Furniture, equipment, and software	123,196	115,312	106,629
Other real estate expense	(647)	(1,251)	(1,712)
Credit-related expense	28,541	28,134	33,795
Provision for unfunded lending commitments	(6,238)	(8,629)	(17,104)
Professional and Legal services	50,421	66,011	67,968
Advertising	25,314	25,100	23,362
FDIC premiums	34,422	32,174	38,019
Amortization of core deposit and other intangibles	9,247	10,923	14,375
Debt extinguishment cost	(2,530)	(44,422)	(120,192)
Other	241,459	280,984	300,286
Total noninterest expense	1,600,486	1,665,292	1,714,439
Income before income taxes	451,859	621,423	406,432
Income taxes	142,388	222,961	142,977
Net income	309,471	398,462	263,455
Net loss applicable to noncontrolling interests	0	0	(336)
Net income applicable to controlling interest	309,471	398,462	263,791
Preferred stock dividends	(62,857)	(71,894)	(95,512)
Preferred stock redemption	0	0	125,700
Net earnings applicable to common shareholders	$ 246,614	$ 326,568	$ 293,979
Weighted average common shares outstanding during the period:
Basic shares	203,265	192,207	183,844
Diluted shares	203,698	192,789	184,297
Net earnings per common share:
Basic, per share	$ 1.20	$ 1.68	$ 1.58
Diluted, per share	$ 1.20	$ 1.68	$ 1.58

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 309,471	$ 398,462	$ 263,455
Other comprehensive income, net of tax:
Net unrealized Holding Gains (Losses) on Investment Securities	(23,409)	82,204	145,902
Reclassification of HTM securities to AFS securities	10,938	0	0
Noncredit-related impairment losses on investment securities not expected to be sold	0	0	(13,751)
Reclassification to earnings for realized net fixed income securities losses (gains)	86,023	(6,447)	1,775
Reclassification to earnings for net credit-related impairment losses on investment securities	0	17	99,903
Accretion of securities with noncredit-related impairment losses not expected to be sold	0	1,111	1,258
Net unrealized losses on other noninterest-bearing investments	(2,552)	(390)	(4,503)
Net unrealized holding gains (losses) on derivative instruments	7,455	2,664	(431)
Reclassification adjustment for increase in interest income recognized in earnings on derivative instruments	(5,583)	(1,605)	(1,580)
Pension and postretirement	557	(13,494)	25,483
Other comprehensive income	73,429	64,060	254,056
Comprehensive income	382,900	462,522	517,511
Comprehensive loss applicable to noncontrolling interests	0	0	(336)
Comprehensive income applicable to controlling interest	$ 382,900	$ 462,522	$ 517,847

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2012	$ 6,048,641	$ 1,128,302	$ 4,166,109	$ 1,203,815	$ (446,157)	$ (3,428)
Balance (in shares) at Dec. 31, 2012			184,199,198
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	263,455			263,791		(336)
Other comprehensive income (loss)	254,056				254,056
Stock Issued During Period, Value, New Issues	784,318	800,000	$ (15,682)
Preferred stock redemption	799,468	925,748	(580)	(125,700)
Subordinated debt converted to preferred stock	1,210	$ 1,416	$ (206)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures			478,498
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	32,389		$ 32,389
Dividends on preferred stock	(95,512)			(95,512)
Dividends on common stock	(24,094)			(24,094)
Increase (Decrease) in Deferred Compensation	(30)			(30)
Other changes in noncontrolling interests	(402)		(4,166)			3,764
Balance at Dec. 31, 2013	6,464,563	$ 1,003,970	$ 4,179,024	1,473,670	(192,101)	$ 0
Balance (in shares) at Dec. 31, 2013			184,677,696
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	398,462			398,462
Other comprehensive income (loss)	64,060				64,060
Stock Issued During Period, Value, New Issues	515,856		$ 515,856
Subordinated debt converted to preferred stock	34	$ 41	$ (7)
Stock Issued During Period, Shares, New Issues			17,617,450
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures			719,757
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	28,982		$ 28,982
Dividends on preferred stock	(71,894)			(71,894)
Dividends on common stock	(31,216)			(31,216)
Increase (Decrease) in Deferred Compensation	683			683
Balance at Dec. 31, 2014	$ 7,369,530	$ 1,004,011	$ 4,723,855	1,769,705	(128,041)	$ 0
Balance (in shares) at Dec. 31, 2014	203,014,903		203,014,903
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 309,471			309,471
Other comprehensive income (loss)	73,429				73,429
Preferred stock redemption	176,049	175,669	$ (3,069)	3,449
Subordinated debt converted to preferred stock	104	148	$ (44)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures			1,402,190
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	39,851		$ 39,851
Dividends on preferred stock	(62,857)			(62,857)
Dividends on common stock	(45,133)			(45,133)
Increase (Decrease) in Deferred Compensation	(827)			(827)
Balance at Dec. 31, 2015	$ 7,507,519	$ 828,490	$ 4,766,731	$ 1,966,910	$ (54,612)	$ 0
Balance (in shares) at Dec. 31, 2015	204,417,093		204,417,093

Consolidated Statements Of Cha7

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Dividends on common stock, per share	$ 0	$ 0	$ 0

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 309,471	$ 398,462	$ 263,455
Adjustments to reconcile net income to net cash provided by operating activities:
Debt extinguishment cost	(2,530)	(44,422)	(120,192)
Net impairment losses on investment securities and long-lived assets	250	27	165,134
Provision for credit losses	33,797	(106,711)	(104,240)
Depreciation and amortization	151,088	128,648	130,616
Fixed income securities gains (losses), net	138,735	(10,419)	2,898
Deferred income tax expense (benefit)	(29,803)	25,938	(60,117)
Net decrease (increase) in trading securities	22,453	(36,045)	(6,286)
Net decrease (increase) in loans held for sale	(5,978)	38,610	75,058
Change in other liabilities	(5,759)	42,636	(1,949)
Change in other assets	(67,260)	(50,956)	255,569
Other, net	(14,355)	(20,291)	(5,223)
Net cash provided by operating activities	535,169	454,321	835,107
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	1,836,506	(105,066)	295,640
Proceeds from maturities and paydowns of investment securities held-to-maturity	123,178	108,404	130,938
Purchases of investment securities held-to-maturity	(61,036)	(164,704)	(155,328)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	1,681,280	1,779,327	1,104,010
Purchases of investment securities available-for-sale	(5,513,366)	(1,794,525)	(1,325,704)
Net change in loans and leases	(633,644)	(1,079,151)	(1,446,924)
Purchases of premises and equipment	(157,361)	(175,799)	(88,580)
Proceeds from sales of other real estate owned	24,806	54,056	110,058
Other, net	(48,919)	(34,916)	(22,895)
Net cash used in investing activities	(2,650,718)	(1,342,542)	(1,352,995)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	2,526,016	1,485,192	228,705
Net change in short-term funds borrowed	102,764	(96,125)	(12,274)
Proceeds from issuance of long-term debt	0	0	646,408
Repayments of long-term debt	(287,752)	(1,223,275)	(832,122)
Debt Extinguishment Costs Paid	(2,530)	(35,435)	(45,812)
Cash paid for preferred stock redemption	(175,669)	0	(799,468)
Proceeds from Issuances of common and preferred stock	22,392	526,438	794,143
Dividends paid on common and preferred stock	(108,055)	(96,130)	(119,660)
Other, net	(5,240)	(3,559)	(10,252)
Net cash provided by financing activities	2,071,926	557,106	(150,332)
Net decrease in cash and due from banks	(43,623)	(331,115)	(668,220)
Cash and due from banks at beginning of period	841,942	1,173,057	1,841,277
Cash and due from banks at end of period	798,319	841,942	1,173,057
Cash paid for interest	101,623	152,783	191,897
Net cash paid for income taxes	$ 131,665	$ 182,954	$ 181,318

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Business Zions Bancorporation (“the Parent”) is a financial holding company headquartered in Salt Lake City, Utah, which in 2015 provided a full range of banking and related services through seven subsidiary banks in 11 Western and Southwestern states as follows: Zions Bank, in Utah, Idaho and Wyoming; California Bank & Trust (“CB&T”); Amegy Bank, N. A. (“Amegy”), in Texas; National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado, N.A. (“Vectra”), in Colorado and New Mexico; and The Commerce Bank of Washington (“TCBW”) which operates under that name in Washington and under the name The Commerce Bank of Oregon (“TCBO”) in Oregon. Pursuant to a Board resolution adopted November 21, 2014, The Commerce Bank of Oregon merged into TCBW effective March 31, 2015. The Parent also owns and operates certain nonbank subsidiaries that engage in financial services. Following the close of business on December 31, 2015, these banks and certain of our subsidiaries of the Parent were merged into a single bank which was renamed ZB, N.A. The Parent intends to conduct its future banking business through locally managed and branded units corresponding to these seven banks. Basis of Financial Statement Presentation The consolidated financial statements include the accounts of the Parent and its majority-owned subsidiaries (“the Company,” “we,” “our,” “us”). Unconsolidated investments in which there is a greater than 20% ownership are accounted for by the equity method of accounting; those in which there is less than 20% ownership are accounted for under cost, fair value, or equity methods of accounting. All significant intercompany accounts and transactions have been eliminated in consolidation. The consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and prevailing practices within the financial services industry. References to GAAP, including standards promulgated by the Financial Accounting Standards Board (“FASB”), are made according to sections of the Accounting Standards Codification (“ASC”). Changes to the ASC are made with Accounting Standards Updates (“ASU”) that include consensus issues of the Emerging Issues Task Force (“EITF”). In certain cases, ASUs are issued jointly with International Financial Reporting Standards (“IFRS”). In preparing the consolidated financial statements, we are required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Certain prior year amounts have been reclassified to conform with the current year presentation. These reclassifications did not affect net income or shareholders’ equity. Variable Interest Entities A variable interest entity (“VIE”) is consolidated when a company is the primary beneficiary of the VIE. Current accounting guidance requires continuous analysis on a qualitative rather than a quantitative basis to determine the primary beneficiary of a VIE. At the commencement of our involvement and periodically thereafter, we consider our consolidation conclusions for all entities with which we are involved. As of December 31, 2015 and 2014 , no VIEs have been consolidated in the Company’s financial statements. Statement of Cash Flows For purposes of presentation in the consolidated statements of cash flows, “cash and cash equivalents” are defined as those amounts included in cash and due from banks in the consolidated balance sheets. Security Resell Agreements Security resell agreements represent overnight and term agreements with the majority maturing within 30 days. These agreements are generally treated as collateralized financing transactions and are carried at amounts at which the securities were acquired plus accrued interest. Either the Company, or in some instances third parties on its behalf, take possession of the underlying securities. The fair value of such securities is monitored throughout the contract term to ensure that asset values remain sufficient to protect against counterparty default. We are permitted by contract to sell or repledge certain securities that we accept as collateral for security resell agreements. If sold, our obligation to return the collateral is recorded as “securities sold, not yet purchased” and included as a liability in “Federal funds and other short-term borrowings.” At December 31, 2015 , we held approximately $457 million of securities for which we were permitted by contract to sell or repledge. Security resell agreements averaged approximately $569 million during 2015 , and the maximum amount outstanding at any month-end during 2015 was approximately $1.6 billion . Investment Securities We classify our investment securities according to their purpose and holding period. Gains or losses on the sale of securities are recognized using the specific identification method and recorded in noninterest income. Held-to-maturity (“HTM”) debt securities are carried at amortized cost with purchase discounts or premiums accreted or amortized into interest income over the contractual life of the security. The Company has the intent and ability to hold such securities until maturity. Available-for-sale (“AFS”) securities are stated at fair value and generally consist of debt securities held for investment and marketable equity securities not accounted for under the equity method. Unrealized gains and losses of AFS securities, after applicable taxes, are recorded as a component of other comprehensive income (“OCI”). We review quarterly our investment securities portfolio for any declines in value that are considered to be other-than-temporary impairment (“OTTI”). The process, methodology and factors considered to evaluate securities for OTTI are discussed further in Note 5. Trading securities are stated at fair value and consist of securities acquired for short-term appreciation or other trading purposes. Realized and unrealized gains and losses are recorded in trading income, which is included in capital markets and foreign exchange. The fair values of investment securities, as estimated under current accounting guidance, are discussed in Note 20. Loans and Allowance for Credit Losses Loans are reported at the principal amount outstanding, net of unearned income. Unearned income, which includes deferred fees net of deferred direct loan origination costs, is amortized to interest income over the life of the loan using the interest method. Interest income is recognized on an accrual basis. Estimated prepayments are used in the determination of the amount of amortization. At the time of origination, we determine whether loans will be held for investment or held for sale. We may subsequently change our intent to hold loans for investment and reclassify them as held for sale. Loans held for sale are carried at the lower of aggregate cost or fair value. A valuation allowance is recorded when cost exceeds fair value based on reviews at the time of reclassification and periodically thereafter. Gains and losses are recorded in noninterest income based on the difference between sales proceeds and carrying value. Loans that become other than current with respect to contractual payments due may be accounted for separately depending on the status of the loan, which is determined from certain credit quality indicators and analysis under the circumstances. The loan status includes past due, nonaccrual, impaired, modified, and restructured (including troubled debt restructurings “TDRs”). Our accounting policies for these loan types and our estimation of the related allowance for loan losses are discussed further in Note 6. In the ordinary course of business, we transfer portions of loans under participation agreements to manage credit risk and our portfolio concentration. We evaluate the loan participations to determine if they meet the appropriate accounting guidance to qualify as sales. Certain purchased loans require separate accounting procedures that are also discussed in Note 6. The allowance for credit losses (“ACL”) includes the allowance for loan losses and the reserve for unfunded lending commitments, and represents our estimate of losses inherent in the loan portfolio that may be recognized from loans and lending commitments that are not recoverable. Further discussion of our estimation process for the ACL is included in Note 6. Other Noninterest-Bearing Investments These investments include investments in private equity funds (referred to in this document as private equity investments “PEIs”), venture capital securities, securities acquired for various debt and regulatory requirements, bank-owned life insurance, and certain other noninterest-bearing investments. See further discussions in Notes 5, 17 and 20. Certain PEIs and venture capital securities are accounted for under the equity method and reported at estimated fair value in the absence of readily ascertainable fair values. Changes in fair value and gains and losses from sales are recognized in noninterest income. The values assigned to the securities where no market quotations exist are based upon available information and may not necessarily represent amounts that will ultimately be realized. Such estimated amounts depend on future circumstances and will not be realized until the individual securities are liquidated. Bank-owned life insurance is accounted for at fair value based on the cash surrender values of the general account insurance policies. A third party service provides these values. Other PEIs and those acquired for various debt and regulatory requirements are accounted for at cost. Periodic reviews are conducted for impairment by comparing carrying values with estimates of fair value determined according to the previous discussion. Premises and Equipment Premises and equipment are stated at cost, net of accumulated depreciation and amortization. Depreciation, computed primarily on the straight-line method, is charged to operations over the estimated useful lives of the properties, generally 25 to 40 years for buildings, 3 to 10 years for furniture and equipment, and 3 to 10 years for software, including capitalized costs related to the Company’s new lending and deposit systems. Leasehold improvements are amortized over the terms of the respective leases or the estimated useful lives of the improvements, whichever is shorter. Goodwill and Identifiable Intangible Assets Goodwill and intangible assets deemed to have indefinite lives are not amortized. We subject these assets to annual specified impairment tests as of the beginning of the fourth quarter and more frequently if changing conditions warrant. Core deposit assets and other intangibles with finite useful lives are generally amortized on an accelerated basis using an estimated useful life of up to 12 years. Business Combinations Business combinations are accounted for under the acquisition method of accounting. Upon initially obtaining control, we recognize 100% of all acquired assets and all assumed liabilities regardless of the percentage owned. The assets and liabilities are recorded at their estimated fair values, with goodwill being recorded when such fair values are less than the cost of acquisition. Certain transaction and restructuring costs are expensed as incurred. Changes to estimated fair values from a business combination are recognized as an adjustment to goodwill over the measurement period, which cannot exceed one year from the acquisition date. Results of operations of the acquired business are included in our statement of income from the date of acquisition. Other Real Estate Owned Other real estate owned (“OREO”) consists principally of commercial and residential real estate obtained in partial or total satisfaction of loan obligations. Amounts are recorded initially at fair value (less any selling costs) based on property appraisals at the time of transfer and subsequently at the lower of cost or fair value (less any selling costs). Derivative Instruments We use derivative instruments, including interest rate swaps and floors and basis swaps, as part of our overall interest rate risk management strategy. These instruments enable us to manage to desired asset and liability duration and to reduce interest rate risk exposure by matching estimated repricing periods of interest-sensitive assets and liabilities. We also execute derivative instruments with commercial banking customers to facilitate their risk management strategies. These derivatives are immediately hedged by offsetting derivatives with third parties such that we minimize our net risk exposure as a result of such transactions. We record all derivatives at fair value in the balance sheet as either other assets or other liabilities. See further discussion in Note 7. Commitments and Letters of Credit In the ordinary course of business, we enter into commitments to extend credit, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded in the financial statements when they become payable. The credit risk associated with these commitments is evaluated in a manner similar to the allowance for loan losses. The RULC is presented separately in the balance sheet. Revenue Recognition Service charges and fees on deposit accounts are recognized in accordance with published deposit account agreements for customer accounts or contractual agreements for commercial accounts. Other service charges, commissions and fees include interchange fees, bank services, and other fees which are generally recognized when earned. Share-Based Compensation Share-based compensation generally includes grants of stock options, restricted stock, restricted stock units, and other awards to employees and nonemployee directors. We recognize compensation expense in the statement of income based on the fair value of the associated share-based awards. See further discussion in Note 16. Income Taxes Deferred tax assets and liabilities are determined based on temporary differences between financial statement asset and liability amounts and their respective tax bases, and are measured using enacted tax laws and rates. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are recognized subject to management’s judgment that realization is more likely than not. Unrecognized tax benefits for uncertain tax positions relate primarily to state tax contingencies. See further discussion in Note 14. Net Earnings Per Common Share Net earnings per common share is based on net earnings applicable to common shareholders, which is net of preferred stock dividends. Basic net earnings per common share is based on the weighted average outstanding common shares during each year. Unvested share-based awards with rights to receive nonforfeitable dividends are considered participating securities and included in the computation of basic earnings per share. Diluted net earnings per common share is based on the weighted average outstanding common shares during each year, including common stock equivalents. Stock options, restricted stock, restricted stock units, and stock warrants are converted to common stock equivalents using the treasury method. Diluted net earnings per common share excludes common stock equivalents whose effect is antidilutive. See further discussion in Note 15.

Other Recent Accounting Pronoun

Other Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2015
Other Recent Accounting Pronouncements [Abstract]
Certain Recent Accounting Pronouncements [Text Block]	RECENT ACCOUNTING PRONOUNCEMENTS Standard Description Date of adoption Effect on the financial statements or other significant matters Standards not yet adopted by the Company ASU 2016-02, Leases (Topic 842) The standard requires that a lessee recognize assets and liabilities for leases with lease terms of more than 12 months. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, the standard will require both types of leases to be recognized on the balance sheet. It also requires disclosures to better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. January 1, 2019 We are currently evaluating the potential impact of this new guidance on the Company’s financial statements. ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities The standard provides revised accounting guidance related to the accounting for and reporting of financial instruments. Some of the main provisions include: – Equity investments that do not result in consolidation and are not accounted for under the equity method would be measured at fair value through net income, unless they qualify for the proposed practicability exception for investments that do not have readily determinable fair values. – Changes in instrument-specific credit risk for financial liabilities that are measured under the fair value option would be recognized in other comprehensive income. – Elimination of the requirement to disclose the methods and significant assumptions used to estimate the fair value of financial instruments carried at amortized cost. However it will require the use of exit price when measuring the fair value of financial instruments measured at amortized cost for disclosure purposes. January 1, 2018 We do not currently expect this new guidance will have a material impact on the Company’s financial statements. ASU 2015-07, Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or its Equivalent), (Topic 820) The guidance eliminates the current requirement to categorize within the fair value hierarchy investments whose fair values are measured at net asset value (“NAV”) using the practical expedient in ASC 820. Fair value disclosure of these investments will be made to facilitate reconciliation to amounts reported on the balance sheet. Other related disclosures will continue when the NAV practical expedient is used. Adoption is retrospective and early adoption is permitted. January 1, 2016 We do not expect this new disclosure guidance will have a material impact on the Company’s financial statements. ASU 2015-05, Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement (Subtopic 350-40) The standard provides guidance to determine whether an arrangement includes a software license. If it does, the customer accounts for it the same way as for other software licenses. If no software license is included, the customer accounts for it as a service contract. Adoption may be retrospective or prospective. Early adoption is permitted. January 1, 2016 We do not expect this new guidance will have a material impact on the Company’s financial statements. ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs (Subtopic 835-30) The standard requires that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of the associated debt liability, consistent with debt discounts. Adoption is retrospective and early adoption is permitted. January 1, 2016 We currently include debt issuance costs in other assets. The amount to be reclassified to the debt liability is not material to the Company’s financial statements. Standard Description Date of adoption Effect on the financial statements or other significant matters Standards not yet adopted by the Company (continued) ASU 2015-02, Amendments to the Consolidation Analysis (Topic 810) The new standard changes certain criteria in the variable interest model and the voting model to determine whether certain legal entities are variable interest entities (“VIEs”) and whether they should be consolidated. Additional disclosures are required for entities not currently considered VIEs, but may become VIEs under the new guidance and may be subject to consolidation. Adoption may be retrospective or modified retrospective with a cumulative effect adjustment. Early adoption is permitted. January 1, 2016 We currently do not consolidate any VIEs and do not expect this new guidance will have a material impact on the Company’s financial statements. ASU 2014-09, Revenue from Contracts with Customers (Topic 606) The core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The banking industry does not expect significant changes because major sources of revenue are from financial instruments that have been excluded from the scope of the new standard, (including loans, derivatives, debt and equity securities, etc.). However, the new standard affects other fees charged by banks, such as asset management fees, credit card interchange fees, deposit account fees, etc. Adoption may be made on a full retrospective basis with practical expedients, or on a modified retrospective basis with a cumulative effect adjustment. Early adoption of the guidance is permitted as of January 1, 2017. January 1, 2018, as extended in August 2015 by ASU 2015-14 While we currently do not expect this standard will have a material impact on the Company’s financial statements, we are still in process of conducting our evaluation. Standards adopted by the Company ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure (Subtopic 310-40) The standard addresses the classification of certain foreclosed mortgage loans fully or partially guaranteed under government programs. Under certain such programs, qualifying creditors can extend mortgage loans with a guarantee entitling the creditor to recover all or a portion of the unpaid principal balance from the government if the borrower defaults. A separate other receivable is established that is measured based on the amount of the loans expected to be recovered. January 1, 2015 Our adoption of this standard had no impact on the accompanying financial statements. ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (Subtopic 310-40) The standard clarifies that a creditor should be considered to have physical possession of a residential real estate property collateralizing a residential mortgage loan and thus would reclassify the loan to other real estate owned when certain conditions are satisfied. Additional financial statement disclosures will be required. January 1, 2015 Our adoption of this standard added a nominal amount of additional disclosure to Note 6. ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects (Topic 323) The standard revised conditions an entity must meet to elect the effective yield method when accounting for qualified affordable housing project investments. The EITF final consensus changed the method of amortizing a Low-Income Housing Tax Credit (“LIHTC”) investment from the effective yield method to a proportional amortization method. Amortization would be proportional to the tax credits and tax benefits received but, under a practical expedient available in certain circumstances, amortization could be proportional to only the tax credits. Reporting entities that invest in LIHTC investments through a limited liability entity could elect the proportional amortization method if certain conditions are met. January 1, 2015 Our adoption of this standard did not have a material impact on the accompanying financial statements.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	SUPPLEMENTAL CASH FLOW INFORMATION Noncash activities are summarized as follows: (In thousands) Year Ended December 31, 2015 2014 2013 Loans and leases transferred to other real estate owned $ 11,924 $ 25,189 $ 60,749 Loans and leases reclassified as loans held for sale 5,048 (26,272 ) 36,301 Adjusted cost of HTM securities reclassified to AFS securities 79,276 — 181,915 Preferred stock/beneficial conversion feature transferred to retained earnings as result of the Series C preferred stock redemption — — 125,700

Offsetting Assets and Liabiliti

Offsetting Assets and Liabilities	12 Months Ended
	Dec. 31, 2015
Gross and net information for selecting financial instruments [Abstract]
Cash, Cash Equivalents, and Short-term Investments [Text Block]	. OFFSETTING ASSETS AND LIABILITIES Gross and net information for selected financial instruments in the balance sheet is as follows: December 31, 2015 (In thousands) Gross amounts not offset in the balance sheet Description Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Cash collateral received/pledged Net amount Assets: Federal funds sold and security resell agreements $ 619,758 $ — $ 619,758 $ — $ — $ 619,758 Derivatives (included in other assets) 77,638 — 77,638 (5,916 ) — 71,722 $ 697,396 $ — $ 697,396 $ (5,916 ) $ — $ 691,480 Liabilities: Federal funds and other short-term borrowings $ 346,987 $ — $ 346,987 $ — $ — $ 346,987 Derivatives (included in other liabilities) 72,568 — 72,568 (5,916 ) (61,134 ) 5,518 $ 419,555 $ — $ 419,555 $ (5,916 ) $ (61,134 ) $ 352,505 December 31, 2014 (In thousands) Gross amounts not offset in the balance sheet Description Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Cash collateral received/pledged Net amount Assets: Federal funds sold and security resell agreements $ 1,386,291 $ — $ 1,386,291 $ — $ — $ 1,386,291 Derivatives (included in other assets) 66,420 — 66,420 (3,845 ) (18 ) 62,557 $ 1,452,711 $ — $ 1,452,711 $ (3,845 ) $ (18 ) $ 1,448,848 Liabilities: Federal funds and other short-term borrowings $ 244,223 $ — $ 244,223 $ — $ — $ 244,223 Derivatives (included in other liabilities) 66,064 — 66,064 (3,845 ) (57,547 ) 4,672 $ 310,287 $ — $ 310,287 $ (3,845 ) $ (57,547 ) $ 248,895 Security repurchase and reverse repurchase (“resell”) agreements are offset, when applicable, in the balance sheet according to master netting agreements. Security repurchase agreements are included with “Federal funds and other short-term borrowings.” Derivative instruments may be offset under their master netting agreements; however, for accounting purposes, we present these items on a gross basis in the Company’s balance sheet. See Note 7 for further information regarding derivative instruments.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2015
Investments [Abstract]
Investment Securities	INVESTMENTS Investment Securities Investment securities are summarized below. Note 20 discusses the process to estimate fair value for investment securities. December 31, 2015 (In thousands) Amortized cost Gross unrealized gains Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 545,648 $ 11,218 $ 4,778 $ 552,088 Available-for-sale U.S. Government agencies and corporations: Agency securities 1,231,740 4,313 2,658 1,233,395 Agency guaranteed mortgage-backed securities 3,964,593 7,919 36,037 3,936,475 Small Business Administration loan-backed securities 1,932,817 12,602 14,445 1,930,974 Municipal securities 417,374 2,177 856 418,695 Other debt securities 25,454 152 2,665 22,941 7,571,978 27,163 56,661 7,542,480 Money market mutual funds and other 100,612 61 37 100,636 7,672,590 27,224 56,698 7,643,116 Total $ 8,218,238 $ 38,442 $ 61,476 $ 8,195,204 December 31, 2014 Recognized in OCI 1 Not recognized in OCI (In thousands) Amortized cost Gross unrealized gains Gross unrealized losses Carrying value Gross unrealized gains Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 607,675 $ — $ — $ 607,675 $ 13,018 $ 804 $ 619,889 Asset-backed securities: Trust preferred securities – banks and insurance 79,276 — 39,699 39,577 18,393 663 57,307 686,951 — 39,699 647,252 31,411 1,467 677,196 Available-for-sale U.S. Government agencies and corporations: Agency securities 607,523 1,572 8,343 600,752 600,752 Agency guaranteed mortgage-backed securities 935,164 12,132 2,105 945,191 945,191 Small Business Administration loan-backed securities 1,544,710 16,446 8,891 1,552,265 1,552,265 Municipal securities 189,059 1,143 945 189,257 189,257 Asset-backed securities: Trust preferred securities – banks and insurance 537,589 103 121,984 415,708 415,708 Other 5,252 207 7 5,452 5,452 3,819,297 31,603 142,275 3,708,625 3,708,625 Mutual funds and other 136,591 76 1,044 135,623 135,623 3,955,888 31,679 143,319 3,844,248 3,844,248 Total $ 4,642,839 $ 31,679 $ 183,018 $ 4,491,500 $ 4,521,444 1 The gross unrealized losses recognized in OCI on HTM securities resulted from a previous transfer of AFS securities to HTM and from OTTI. CDO Sales and Paydowns During the second quarter of 2015, we sold the remaining portfolio of our collateralized debt obligation (“CDO”) securities, or $574 million at amortized cost, and realized net losses of approximately $137 million . During the first quarter of 2015, we reclassified all of the remaining held-to-maturity CDO securities, or approximately $79 million at amortized cost, to AFS securities. The reclassification resulted from increased risk weights for these securities under the new Basel III capital rules, and was made in accordance with applicable accounting guidance that allows for such reclassifications when increased risk weights of debt securities must be used for regulatory risk-based capital purposes. No gain or loss was recognized in the statement of income at the time of reclassification. During 2014, we reduced the CDO portfolio by $1.02 billion amortized cost through sales and paydowns/payoffs which resulted in net fixed income securities gains of $10.4 million . These sales were made in part as a result of the Volcker Rule (“VR”). Maturities The amortized cost and estimated fair value of investment debt securities are shown subsequently as of December 31, 2015 by expected timing of principal payments. Actual principal payments may differ from contractual or expected principal payments because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Held-to-maturity Available-for-sale (In thousands) Amortized cost Estimated fair value Amortized cost Estimated fair value Due in one year or less $ 64,213 $ 64,453 $ 1,040,087 $ 1,036,107 Due after one year through five years 198,818 202,124 2,932,469 2,921,436 Due after five years through ten years 153,325 156,676 2,606,838 2,597,827 Due after ten years 129,292 128,835 992,584 987,110 $ 545,648 $ 552,088 $ 7,571,978 $ 7,542,480 The following is a summary of the amount of gross unrealized losses for debt securities and the estimated fair value by length of time the securities have been in an unrealized loss position: December 31, 2015 Less than 12 months 12 months or more Total (In thousands) Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 4,521 $ 122,197 $ 257 $ 13,812 $ 4,778 $ 136,009 Asset-backed securities: Trust preferred securities – banks and insurance — — — — — — 4,521 122,197 257 13,812 4,778 136,009 Available-for-sale U.S. Government agencies and corporations: Agency securities 2,176 559,196 482 131,615 2,658 690,811 Agency guaranteed mortgage-backed securities 34,583 3,639,824 1,454 65,071 36,037 3,704,895 Small Business Administration loan-backed securities 5,348 567,365 9,097 535,376 14,445 1,102,741 Municipal securities 735 102,901 121 5,733 856 108,634 Other — — 2,665 12,337 2,665 12,337 Asset-backed securities: Trust preferred securities – banks and insurance — — — — — — Auction rate securities — — — — — — 42,842 4,869,286 13,819 750,132 56,661 5,619,418 Mutual funds and other 37 35,488 — — 37 35,488 42,879 4,904,774 13,819 750,132 56,698 5,654,906 Total $ 47,400 $ 5,026,971 $ 14,076 $ 763,944 $ 61,476 $ 5,790,915 December 31, 2014 Less than 12 months 12 months or more Total (In thousands) Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 527 $ 62,762 $ 277 $ 14,003 $ 804 $ 76,765 Asset-backed securities: Trust preferred securities – banks and insurance 53 122 40,309 57,186 40,362 57,308 580 62,884 40,586 71,189 41,166 134,073 Available-for-sale U.S. Government agencies and corporations: Agency securities 4,510 295,694 3,833 101,188 8,343 396,882 Agency guaranteed mortgage-backed securities 1,914 425,114 191 12,124 2,105 437,238 Small Business Administration loan-backed securities 5,869 495,817 3,022 175,523 8,891 671,340 Municipal securities 258 36,551 687 4,616 945 41,167 Asset-backed securities: Trust preferred securities – banks and insurance — — 121,984 405,605 121,984 405,605 Auction rate securities 7 1,607 — — 7 1,607 12,558 1,254,783 129,717 699,056 142,275 1,953,839 Mutual funds and other 1,044 71,907 — — 1,044 71,907 13,602 1,326,690 129,717 699,056 143,319 2,025,746 Total $ 14,182 $ 1,389,574 $ 170,303 $ 770,245 $ 184,485 $ 2,159,819 At December 31, 2015 and 2014 , respectively, 187 and 153 HTM and 709 and 458 AFS investment securities were in an unrealized loss position. Other-Than-Temporary Impairment Ongoing Policy We review investment securities on a quarterly basis for the presence of other-than-temporary impairment (“OTTI”). We assess whether OTTI is present when the fair value of a debt security is less than its amortized cost basis at the balance sheet date (the majority of the investment portfolio are debt securities). Under these circumstances, OTTI is considered to have occurred if (1) we have formed a documented intent to sell identified securities or initiated such sales; (2) it is “more likely than not” we will be required to sell the security before recovery of its amortized cost basis; or (3) the present value of expected cash flows is not sufficient to recover the entire amortized cost basis. Noncredit-related OTTI in securities we intend to sell is recognized in earnings as is any credit-related OTTI in securities, regardless of our intent. Noncredit-related OTTI on AFS securities not expected to be sold is recognized in OCI. The amount of noncredit-related OTTI in a security is quantified as the difference in a security’s amortized cost after adjustment for credit impairment, and its lower fair value. Presentation of OTTI is made in the statement of income on a gross basis with an offset for the amount of OTTI recognized in OCI. Our OTTI evaluation process takes into consideration current market conditions; fair value in relationship to cost; extent and nature of change in fair value; severity and duration of the impairment; recent events specific to the issuer or industry; our assessment of the creditworthiness of the issuer, including external credit ratings, changes, recent downgrades, and trends; the cash flow priority position of the instrument that we hold in the case of structured securities; volatility of earnings and trends; current analysts’ evaluations; all available information relevant to the collectability of debt securities; and other key measures. In addition, for AFS securities with fair values below amortized cost, we must determine if we intend to sell the securities or if it is more likely than not that we will be required to sell the securities before recovery of their amortized cost basis. For HTM securities, we must determine we have the ability to hold the securities to maturity. We consider any other relevant factors before concluding our evaluation for the existence of OTTI in our securities portfolio. OTTI Conclusions The following summarizes the conclusions from our OTTI evaluation for those security types that had significant gross unrealized losses at December 31, 2015 : OTTI – U.S. Government Agencies and Corporations Agency Securities: These securities were issued by the Federal Agricultural Mortgage Corporation (“FAMC”) and the Export-Import Bank of the U.S. These securities are fixed or floating-rate and were generally purchased at par. They have maturity dates from 1 to 25 years and have contractual cash flows guaranteed by agencies of the U.S. Government. Unrealized losses relate to changes in interest rates subsequent to purchase and are not attributable to credit. At December 31, 2015, we did not have an intent to sell identified securities with unrealized losses or initiate such sales, and we believe it is more likely than not we would not be required to sell such securities before recovery of their amortized cost basis. Therefore, we did not record OTTI for these securities during 2015. Agency Guaranteed Mortgage-Backed Securities: These pass-through securities are comprised largely of fixed and floating-rate residential mortgage-backed securities issued by the Government National Mortgage Association (“GNMA”), the Federal National Mortgage Association (“FNMA”), or the Federal Home Loan Mortgage Corporation (“FHLMC”). They were generally purchased at premiums with maturity dates from 10 to 15 years for fixed-rate securities and 30 years for floating-rate securities. These securities benefit from certain guarantee provisions or, in the case of GNMA, direct U.S. government guarantees. Unrealized losses relate to changes in interest rates subsequent to purchase and are not attributable to credit. At December 31, 2015, we did not have an intent to sell identified securities with unrealized losses or initiate such sales, and we believe it is more likely than not we would not be required to sell such securities before recovery of their amortized cost basis. Therefore, we did not record OTTI for these securities during 2015. Small Business Administration (“SBA”) Loan-Backed Securities: These securities were generally purchased at premiums with maturities from 5 to 25 years and have principal cash flows guaranteed by the SBA. Unrealized losses relate to changes in interest rates subsequent to purchase and are not attributable to credit. At December 31, 2015, we did not have an intent to sell identified SBA securities with unrealized losses or initiate such sales, and we believe it is more likely than not we would not be required to sell such securities before recovery of their amortized cost basis. Therefore, we did not record OTTI for these securities during 2015. The following is a tabular rollforward of the total amount of credit-related OTTI, including amounts recognized in earnings: (In thousands) 2015 2014 HTM AFS Total HTM AFS Total Balance of credit-related OTTI at beginning of year $ (9,079 ) $ (95,472 ) $ (104,551 ) $ (9,052 ) $ (176,833 ) $ (185,885 ) Additions recognized in earnings during the year: Credit-related OTTI not previously recognized 1 — — — — — — Credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost basis 2 — — — (27 ) — (27 ) Subtotal of amounts recognized in earnings — — — (27 ) — (27 ) Transfers from HTM to AFS 9,079 (9,079 ) — — — — Reductions for securities sold or paid off during the year — 104,551 104,551 — 81,361 81,361 Reductions for securities the Company intends to sell or will be required to sell before recovery of its amortized cost basis — — — — — — Balance of credit-related OTTI at end of year $ — $ — $ — $ (9,079 ) $ (95,472 ) $ (104,551 ) 1 Relates to securities not previously impaired. 2 Relates to additional impairment on securities previously impaired. To determine the credit component of OTTI for all security types, we utilize projected cash flows. These cash flows are credit adjusted using, among other things, assumptions for default probability and loss severity. Certain other unobservable inputs such as prepayment rate assumptions are also utilized. In addition, certain internal models may be utilized. See Note 20 for further discussion. To determine the credit-related portion of OTTI in accordance with applicable accounting guidance, we use the security specific effective interest rate when estimating the present value of cash flows. For those securities with credit-related OTTI recognized in the statement of income, the amounts of pretax noncredit-related OTTI recognized in OCI were as follows: (In thousands) 2015 2014 2013 HTM $ — $ — $ 16,114 AFS — — 7,358 $ — $ — $ 23,472 The following summarizes gains and losses, including OTTI, that were recognized in the statement of income: 2015 2014 2013 (In thousands) Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Investment securities: Held-to-maturity $ 1 $ — $ 18 $ 27 $ 81 $ 403 Available-for-sale 8,443 147,656 92,525 83,815 13,881 181,591 Other noninterest-bearing investments 25,045 12,693 23,706 8,544 10,182 1,662 33,489 160,349 116,249 92,386 24,144 183,656 Net gains (losses) $ (126,860 ) $ 23,863 $ (159,512 ) Statement of income information: Net impairment losses on investment securities $ — $ (27 ) $ (165,134 ) Equity securities gains, net 11,875 13,471 8,520 Fixed income securities gains (losses), net (138,735 ) 10,419 (2,898 ) Net gains (losses) $ (126,860 ) $ 23,863 $ (159,512 ) Interest income by security type is as follows: (In thousands) 2015 2014 2013 Taxable Nontaxable Total Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 12,777 $ 10,892 $ 23,669 $ 14,770 $ 11,264 $ 26,034 $ 19,905 $ 11,375 $ 31,280 Available-for-sale 94,877 3,326 98,203 71,365 2,558 73,923 69,061 2,046 71,107 Trading 2,214 — 2,214 1,979 — 1,979 1,055 — 1,055 $ 109,868 $ 14,218 $ 124,086 $ 88,114 $ 13,822 $ 101,936 $ 90,021 $ 13,421 $ 103,442 Investment securities with a carrying value of approximately $2.3 billion and $1.4 billion at December 31, 2015 and 2014 , respectively, were pledged to secure public and trust deposits, advances, and for other purposes as required by law. Securities are also pledged as collateral for security repurchase agreements. Private Equity Investments Effect of Volcker Rule The VR, as published pursuant to the Dodd-Frank Act in December 2013 and amended in January 2014, significantly restricted certain activities by covered bank holding companies, including restrictions on certain types of securities, proprietary trading, and private equity investing. The Company’s PEIs consist of Small Business Investment Companies (“SBICs”) and non-SBICs. Following the sales of its CDO securities, the only prohibited investments under the VR requiring divestiture by the Company were certain of its PEIs. Of the recorded PEIs of $137 million at December 31, 2015 , approximately $18 million remain prohibited by the VR. As of December 31, 2015 , we have sold a total of approximately $ 17 million of PEIs, including $9 million during 2015 and $8 million during 2014. All of these sales related to prohibited PEIs. The 2015 sales resulted in insignificant amounts of realized gains or losses. The 2014 sales resulted in net realized gains of $5.6 million , of which $5.1 million was recorded in equity securities gains and $0.5 million was recorded in dividends and other investment income. Further, we recognized $4.7 million of net impairment in 2014 on prohibited PEIs. The remaining balance of PEIs are primarily recorded at estimated fair value at December 31, 2015 . We will dispose of the remaining $18 million of prohibited PEIs before the required deadline. However, the required deadline has been extended to July 21, 2016 from July 21, 2015 and the Federal Reserve has announced its intention to grant banking entities an additional one-year extension to July 21, 2017. See other discussions in Notes 17 and 20. As discussed in Note 17, we have $ 22 million at December 31, 2015 of unfunded commitments for PEIs, of which approximately $7 million relate to prohibited PEIs. Until we dispose of the prohibited PEIs, we expect to fund these commitments if and as capital calls are made, as allowed under the VR.

Loans And Allowance For Credit

Loans And Allowance For Credit Losses	12 Months Ended
	Dec. 31, 2015
Loans And Allowance For Credit Losses [Abstract]
Loans And Allowance For Credit Losses	LOANS AND ALLOWANCE FOR CREDIT LOSSES Loans and Loans Held for Sale Loans are summarized as follows according to major portfolio segment and specific loan class: December 31, (In thousands) 2015 2014 Loans held for sale $ 149,880 $ 132,504 Commercial: Commercial and industrial $ 13,211,481 $ 13,162,955 Leasing 441,666 408,974 Owner occupied 7,150,028 7,351,548 Municipal 675,839 520,887 Total commercial 21,479,014 21,444,364 Commercial real estate: Construction and land development 1,841,502 1,986,408 Term 8,514,401 8,126,600 Total commercial real estate 10,355,903 10,113,008 Consumer: Home equity credit line 2,416,357 2,321,150 1-4 family residential 5,382,099 5,200,882 Construction and other consumer real estate 385,240 370,542 Bankcard and other revolving plans 443,780 401,352 Other 187,149 212,360 Total consumer 8,814,625 8,506,286 Total loans $ 40,649,542 $ 40,063,658 Loan balances are presented net of unearned income and fees, which amounted to $150.3 million at December 31, 2015 and $144.7 million at December 31, 2014 . Owner occupied and commercial real estate (“CRE”) loans include unamortized premiums of approximately $26.2 million at December 31, 2015 and $36.5 million at December 31, 2014 . Municipal loans generally include loans to municipalities with the debt service being repaid from general funds or pledged revenues of the municipal entity, or to private commercial entities or 501(c)(3) not-for-profit entities utilizing a pass-through municipal entity to achieve favorable tax treatment. Land development loans included in the construction and land development loan class were $288.0 million at December 31, 2015 , and $484.9 million at December 31, 2014 . Loans with a carrying value of approximately $19.4 billion at December 31, 2015 and $22.5 billion at December 31, 2014 have been pledged at the Federal Reserve and various Federal Home Loan Banks (“FHLBs”) as collateral for potential borrowings. We sold loans totaling $1.4 billion in 2015 , $1.2 billion in 2014 , and $1.6 billion in 2013, that were classified as loans held for sale. The sold loans were derecognized from the balance sheet. Loans classified as loans held for sale primarily consist of conforming residential mortgages and the guaranteed portion of SBA loans. The principal balance of sold loans for which we retain servicing was approximately $1.3 billion at December 31, 2015 and 2014 . Amounts added to loans held for sale during these years were $1.4 billion , $1.2 billion , and $1.5 billion , respectively. Income from loans sold, excluding servicing, was $17.8 million in 2015 , $15.1 million in 2014 , and $24.1 million in 2013. During the third quarter of 2014, construction and land development loans decreased by $447 million due to conversions to term loans, and increased syndication and participation arrangements. Additionally, 1-4 family residential loans increased by $326 million , primarily due to the purchase of $249 million par amount of high quality jumbo adjustable rate mortgage (“ARM”) loans from another bank. Management took these actions to improve the risk profile of the Company’s loans and reduce portfolio concentration risk. Since 2009, CB&T and NSB have had loss-sharing agreements with the Federal Deposit Insurance Corporation (“FDIC”), which provided indemnification for credit losses of acquired loans and foreclosed assets up to specified thresholds. The agreements for commercial loans, which comprised the major portion of the acquired portfolio, expired as of September 30, 2014. The agreements for 1-4 family residential loans will expire in 2019. In previous periods, the FDIC-supported loan balances were presented separately in this footnote and in other disclosures, and included purchased credit-impaired (“PCI”) loans as subsequently discussed in Purchased Loans. Due to declining balances, for all years presented herein, the FDIC-supported/PCI loans have been reclassified to their respective loan segments and classes. Allowance for Credit Losses The allowance for credit losses (“ACL”) consists of the allowance for loan and lease losses (“ALLL”) (also referred to as the allowance for loan losses) and the RULC. Allowance for Loan and Lease Losses The ALLL represents our estimate of probable and estimable losses inherent in the loan and lease portfolio as of the balance sheet date. Losses are charged to the ALLL when recognized. Generally, commercial loans are charged off or charged down at the point at which they are determined to be uncollectible in whole or in part, or when 180 days past due, unless the loan is well secured and in the process of collection. Consumer loans are either charged off or charged down to net realizable value no later than the month in which they become 180 days past due. Closed-end loans that are not secured by residential real estate are either charged off or charged down to net realizable value no later than the month in which they become 120 days past due. We establish the amount of the ALLL by analyzing the portfolio at least quarterly, and we adjust the provision for loan losses so the ALLL is at an appropriate level at the balance sheet date. We determine our ALLL as the best estimate within a range of estimated losses. The methodologies we use to estimate the ALLL depend upon the impairment status and portfolio segment of the loan. The methodology for impaired loans is discussed subsequently. For the commercial and CRE segments, we use a comprehensive loan grading system to assign probability of default (“PD”) and loss given default (“LGD”) grades to each loan. The credit quality indicators discussed subsequently are based on this grading system. In addition, loan officers utilize their experience and judgment in assigning PD and LGD grades, subject to confirmation of the PD and LGD by either credit risk or credit examination. We create groupings of these grades for each banking affiliate and loan class and calculate historic loss rates using a loss migration analysis that attributes historic realized losses to these loan grade groupings over the period of January 2008 through the most recent full quarter. For the consumer loan segment, we use roll rate models to forecast probable inherent losses. Roll rate models measure the rate at which consumer loans migrate from one delinquency category to the next worse delinquency category, and eventually to loss. We estimate roll rates for consumer loans using recent delinquency and loss experience by segmenting our consumer loan portfolio into separate pools based on common risk characteristics and separately calculating historical delinquency and loss experience for each pool. These roll rates are then applied to current delinquency levels to estimate probable inherent losses. Roll rates incorporate housing market trends inasmuch as these trends manifest themselves in charge-offs and delinquencies. In addition, our qualitative and environmental factors discussed subsequently incorporate the most recent housing market trends. The current status and historical changes in qualitative and environmental factors may not be reflected in our quantitative models. Thus, after applying historical loss experience, as described above, we review the quantitatively derived level of ALLL for each segment using qualitative criteria and use those criteria to determine our estimate within the range. We track various risk factors that influence our judgment regarding the level of the ALLL across the portfolio segments. These factors primarily include: • Asset quality trends • Risk management and loan administration practices • Risk identification practices • Effect of changes in the nature and volume of the portfolio • Existence and effect of any portfolio concentrations • National economic and business conditions • Regional and local economic and business conditions • Data availability and applicability • Effects of other external factors The magnitude of the impact of these factors on our qualitative assessment of the ALLL changes from quarter to quarter according to the extent these factors are already reflected in historic loss rates and according to the extent these factors diverge from one to another. We also consider the uncertainty inherent in the estimation process when evaluating the ALLL. Reserve for Unfunded Lending Commitments We also estimate a reserve for potential losses associated with off-balance sheet commitments, including standby letters of credit. We determine the RULC using the same procedures and methodologies that we use for the ALLL. The loss factors used in the RULC are the same as the loss factors used in the ALLL, and the qualitative adjustments used in the RULC are the same as the qualitative adjustments used in the ALLL. We adjust the Company’s unfunded lending commitments that are not unconditionally cancelable to an outstanding amount equivalent using credit conversion factors, and we apply the loss factors to the outstanding equivalents. Changes in the ACL are summarized as follows: December 31, 2015 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of year $ 412,514 $ 145,009 $ 47,140 $ 604,663 Additions: Provision for loan losses 96,995 (51,777 ) (5,183 ) 40,035 Adjustment for FDIC-supported/PCI loans (57 ) 57 5 5 Deductions: Gross loan and lease charge-offs (110,437 ) (14,194 ) (14,298 ) (138,929 ) Recoveries 55,262 34,897 10,115 100,274 Net loan and lease (charge-offs) recoveries (55,175 ) 20,703 (4,183 ) (38,655 ) Balance at end of year $ 454,277 $ 113,992 $ 37,779 $ 606,048 Reserve for unfunded lending commitments Balance at beginning of year $ 58,931 $ 21,517 $ 628 $ 81,076 Provision credited to earnings (1,235 ) (4,991 ) (12 ) (6,238 ) Balance at end of year $ 57,696 $ 16,526 $ 616 $ 74,838 Total allowance for credit losses Allowance for loan losses $ 454,277 $ 113,992 $ 37,779 $ 606,048 Reserve for unfunded lending commitments 57,696 16,526 616 74,838 Total allowance for credit losses $ 511,973 $ 130,518 $ 38,395 $ 680,886 December 31, 2014 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of year $ 469,213 $ 216,012 $ 61,066 $ 746,291 Additions: Provision for loan losses (19,691 ) (67,825 ) (10,566 ) (98,082 ) Adjustment for FDIC-supported/PCI loans (1,209 ) — (96 ) (1,305 ) Deductions: Gross loan and lease charge-offs (76,345 ) (15,322 ) (14,543 ) (106,210 ) Recoveries 40,546 12,144 11,279 63,969 Net loan and lease charge-offs (35,799 ) (3,178 ) (3,264 ) (42,241 ) Balance at end of year $ 412,514 $ 145,009 $ 47,140 $ 604,663 Reserve for unfunded lending commitments Balance at beginning of year $ 48,345 $ 37,485 $ 3,875 $ 89,705 Provision charged (credited) to earnings 10,586 (15,968 ) (3,247 ) (8,629 ) Balance at end of year $ 58,931 $ 21,517 $ 628 $ 81,076 Total allowance for credit losses Allowance for loan losses $ 412,514 $ 145,009 $ 47,140 $ 604,663 Reserve for unfunded lending commitments 58,931 21,517 628 81,076 Total allowance for credit losses $ 471,445 $ 166,526 $ 47,768 $ 685,739 The ALLL and outstanding loan balances according to the Company’s impairment method are summarized as follows: December 31, 2015 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Individually evaluated for impairment $ 36,909 $ 3,154 $ 9,462 $ 49,525 Collectively evaluated for impairment 417,295 110,417 27,866 555,578 Purchased loans with evidence of credit deterioration 73 421 451 945 Total $ 454,277 $ 113,992 $ 37,779 $ 606,048 Outstanding loan balances Individually evaluated for impairment $ 289,629 $ 107,341 $ 92,605 $ 489,575 Collectively evaluated for impairment 21,129,125 10,193,840 8,712,079 40,035,044 Purchased loans with evidence of credit deterioration 60,260 54,722 9,941 124,923 Total $ 21,479,014 $ 10,355,903 $ 8,814,625 $ 40,649,542 December 31, 2014 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Individually evaluated for impairment $ 28,627 $ 4,027 $ 9,059 $ 41,713 Collectively evaluated for impairment 382,552 140,090 37,508 560,150 Purchased loans with evidence of credit deterioration 1,335 892 573 2,800 Total $ 412,514 $ 145,009 $ 47,140 $ 604,663 Outstanding loan balances Individually evaluated for impairment $ 259,207 $ 167,435 $ 95,267 $ 521,909 Collectively evaluated for impairment 21,105,217 9,861,862 8,395,371 39,362,450 Purchased loans with evidence of credit deterioration 79,940 83,711 15,648 179,299 Total $ 21,444,364 $ 10,113,008 $ 8,506,286 $ 40,063,658 Nonaccrual and Past Due Loans Loans are generally placed on nonaccrual status when payment in full of principal and interest is not expected, or the loan is 90 days or more past due as to principal or interest, unless the loan is both well secured and in the process of collection. Factors we consider in determining whether a loan is placed on nonaccrual include delinquency status, collateral value, borrower or guarantor financial statement information, bankruptcy status, and other information which would indicate that the full and timely collection of interest and principal is uncertain. A nonaccrual loan may be returned to accrual status when all delinquent interest and principal become current in accordance with the terms of the loan agreement; the loan, if secured, is well secured; the borrower has paid according to the contractual terms for a minimum of six months; and analysis of the borrower indicates a reasonable assurance of the ability and willingness to maintain payments. Payments received on nonaccrual loans are applied as a reduction to the principal outstanding. Closed-end loans with payments scheduled monthly are reported as past due when the borrower is in arrears for two or more monthly payments. Similarly, open-end credit such as charge-card plans and other revolving credit plans are reported as past due when the minimum payment has not been made for two or more billing cycles. Other multi-payment obligations (i.e., quarterly, semiannual, etc.), single payment, and demand notes are reported as past due when either principal or interest is due and unpaid for a period of 30 days or more. Nonaccrual loans are summarized as follows: December 31, (In thousands) 2015 2014 Commercial: Commercial and industrial $ 163,906 $ 105,591 Leasing 3,829 295 Owner occupied 73,881 87,243 Municipal 951 1,056 Total commercial 242,567 194,185 Commercial real estate: Construction and land development 7,045 23,880 Term 40,253 25,107 Total commercial real estate 47,298 48,987 Consumer: Home equity credit line 8,270 11,430 1-4 family residential 50,254 49,861 Construction and other consumer real estate 748 1,735 Bankcard and other revolving plans 537 196 Other 186 254 Total consumer loans 59,995 63,476 Total $ 349,860 $ 306,648 Past due loans (accruing and nonaccruing) are summarized as follows: December 31, 2015 (In thousands) Current 30-89 days past due 90+ days past due Total past due Total loans Accruing loans 90+ days past due Nonaccrual loans that are current 1 Commercial: Commercial and industrial $ 13,114,045 $ 60,523 $ 36,913 $ 97,436 $ 13,211,481 $ 3,065 $ 117,942 Leasing 440,963 183 520 703 441,666 — 3,309 Owner occupied 7,085,086 37,776 27,166 64,942 7,150,028 3,626 43,984 Municipal 668,207 7,586 46 7,632 675,839 46 951 Total commercial 21,308,301 106,068 64,645 170,713 21,479,014 6,737 166,186 Commercial real estate: Construction and land development 1,835,360 842 5,300 6,142 1,841,502 — 1,745 Term 8,469,390 10,424 34,587 45,011 8,514,401 21,697 24,867 Total commercial real estate 10,304,750 11,266 39,887 51,153 10,355,903 21,697 26,612 Consumer: Home equity credit line 2,407,972 4,717 3,668 8,385 2,416,357 — 3,053 1-4 family residential 5,340,549 14,828 26,722 41,550 5,382,099 1,036 20,939 Construction and other consumer real estate 374,987 8,593 1,660 10,253 385,240 1,337 408 Bankcard and other revolving plans 440,358 1,861 1,561 3,422 443,780 1,217 146 Other 186,436 647 66 713 187,149 — 83 Total consumer loans 8,750,302 30,646 33,677 64,323 8,814,625 3,590 24,629 Total $ 40,363,353 $ 147,980 $ 138,209 $ 286,189 $ 40,649,542 $ 32,024 $ 217,427 December 31, 2014 (In thousands) Current 30-89 days past due 90+ days past due Total past due Total loans Accruing loans 90+ days past due Nonaccrual loans that are current 1 Commercial: Commercial and industrial $ 13,092,731 $ 28,295 $ 41,929 $ 70,224 $ 13,162,955 $ 4,677 $ 64,385 Leasing 408,724 225 25 250 408,974 — 270 Owner occupied 7,275,842 29,182 46,524 75,706 7,351,548 3,334 39,649 Municipal 520,887 — — — 520,887 — 1,056 Total commercial 21,298,184 57,702 88,478 146,180 21,444,364 8,011 105,360 Commercial real estate: Construction and land development 1,972,206 2,711 11,491 14,202 1,986,408 92 12,481 Term 8,082,940 14,415 29,245 43,660 8,126,600 19,700 13,787 Total commercial real estate 10,055,146 17,126 40,736 57,862 10,113,008 19,792 26,268 Consumer: Home equity credit line 2,309,967 4,503 6,680 11,183 2,321,150 1 1,779 1-4 family residential 5,163,610 12,416 24,856 37,272 5,200,882 318 20,599 Construction and other consumer real estate 359,723 9,675 1,144 10,819 370,542 160 608 Bankcard and other revolving plans 397,882 2,425 1,045 3,470 401,352 946 80 Other 211,560 644 156 800 212,360 — 84 Total consumer loans 8,442,742 29,663 33,881 63,544 8,506,286 1,425 23,150 Total $ 39,796,072 $ 104,491 $ 163,095 $ 267,586 $ 40,063,658 $ 29,228 $ 154,778 1 Represents nonaccrual loans not past due more than 30 days; however, full payment of principal and interest is still not expected. Credit Quality Indicators In addition to the past due and nonaccrual criteria, we also analyze loans using loan risk grading systems, which vary based on the size and type of credit risk exposure. The internal risk grades assigned to loans follow our definitions of Pass, Special Mention, Substandard, and Doubtful, which are consistent with published definitions of regulatory risk classifications. Definitions of Pass, Special Mention, Substandard, and Doubtful are summarized as follows: Pass – A Pass asset is higher quality and does not fit any of the other categories described below. The likelihood of loss is considered remote. Special Mention – A Special Mention asset has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the bank’s credit position at some future date. Substandard – A Substandard asset is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Assets so classified have well-defined weaknesses and are characterized by the distinct possibility that the bank may sustain some loss if deficiencies are not corrected. Doubtful – A Doubtful asset has all the weaknesses inherent in a Substandard asset with the added characteristics that the weaknesses make collection or liquidation in full highly questionable. We generally assign internal risk grades to commercial and CRE loans with commitments equal to or greater than $750,000 based on financial and statistical models, individual credit analysis, and loan officer judgment. For these larger loans, we assign one of multiple grades within the Pass classification or one of the following four grades: Special Mention, Substandard, Doubtful, and Loss. Loss indicates that the outstanding balance has been charged off. We confirm our internal risk grades quarterly, or as soon as we identify information that affects the credit risk of the loan. For consumer loans or certain small commercial loans with commitments equal to or less than $750,000 , we generally assign internal risk grades similar to those described previously based on automated rules that depend on refreshed credit scores, payment performance, and other risk indicators. These are generally assigned either a Pass or Substandard grade and are reviewed as we identify information that might warrant a grade change. Outstanding loan balances (accruing and nonaccruing) categorized by these credit quality indicators are summarized as follows: December 31, 2015 (In thousands) Pass Special mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 12,007,076 $ 399,847 $ 804,403 $ 155 $ 13,211,481 Leasing 411,131 5,166 25,369 — 441,666 Owner occupied 6,720,052 139,784 290,192 — 7,150,028 Municipal 663,903 — 11,936 — 675,839 Total commercial 19,802,162 544,797 1,131,900 155 21,479,014 $ 454,277 Commercial real estate: Construction and land development 1,786,610 42,348 12,544 — 1,841,502 Term 8,319,348 47,245 139,036 8,772 8,514,401 Total commercial real estate 10,105,958 89,593 151,580 8,772 10,355,903 113,992 Consumer: Home equity credit line 2,404,635 — 11,722 — 2,416,357 1-4 family residential 5,325,519 — 56,580 — 5,382,099 Construction and other consumer real estate 381,738 — 3,502 — 385,240 Bankcard and other revolving plans 440,282 — 3,498 — 443,780 Other 186,836 — 313 — 187,149 Total consumer loans 8,739,010 — 75,615 — 8,814,625 37,779 Total $ 38,647,130 $ 634,390 $ 1,359,095 $ 8,927 $ 40,649,542 $ 606,048 December 31, 2014 (In thousands) Pass Special mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 12,515,846 $ 209,215 $ 426,002 $ 11,892 $ 13,162,955 Leasing 399,032 4,868 5,074 — 408,974 Owner occupied 6,844,310 168,423 338,815 — 7,351,548 Municipal 518,513 1,318 1,056 — 520,887 Total commercial 20,277,701 383,824 770,947 11,892 21,444,364 $ 412,514 Commercial real estate: Construction and land development 1,925,685 8,464 52,259 — 1,986,408 Term 7,802,571 96,347 223,324 4,358 8,126,600 Total commercial real estate 9,728,256 104,811 275,583 4,358 10,113,008 145,009 Consumer: Home equity credit line 2,304,352 — 16,798 — 2,321,150 1-4 family residential 5,138,660 — 62,222 — 5,200,882 Construction and other consumer real estate 367,932 — 2,610 — 370,542 Bankcard and other revolving plans 399,446 — 1,906 — 401,352 Other 211,811 — 549 — 212,360 Total consumer loans 8,422,201 — 84,085 — 8,506,286 47,140 Total $ 38,428,158 $ 488,635 $ 1,130,615 $ 16,250 $ 40,063,658 $ 604,663 Impaired Loans Loans are considered impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due in accordance with the contractual terms of the loan agreement, including scheduled interest payments. For our non-purchased credit-impaired loans, if a nonaccrual loan has a balance greater than $1 million , or if a loan is a TDR, including TDRs that subsequently default, or if the loan is no longer reported as a TDR, we individually evaluate the loan for impairment and estimate a specific reserve for the loan for all portfolio segments under applicable accounting guidance. Smaller nonaccrual loans are pooled for ALLL estimation purposes. PCI loans are included in impaired loans and are accounted for under separate accounting guidance. See subsequent discussion under Purchased Loans. When a loan is impaired, we estimate a specific reserve for the loan based on the projected present value of the loan’s future cash flows discounted at the loan’s effective interest rate, the observable market price of the loan, or the fair value of the loan’s underlying collateral. The process of estimating future cash flows also incorporates the same determining factors discussed previously under nonaccrual loans. When we base the impairment amount on the fair value of the loan’s underlying collateral, we generally charge-off the portion of the balance that is impaired, such that these loans do not have a specific reserve in the ALLL. Payments received on impaired loans that are accruing are recognized in interest income, according to the contractual loan agreement. Payments received on impaired loans that are on nonaccrual are not recognized in interest income, but are applied as a reduction to the principal outstanding. The amount of interest income recognized on a cash basis during the time the loans were impaired within the years ended December 31, 2015 and 2014 was not significant. Information on all impaired loans is summarized as follows, including the average recorded investment and interest income recognized for the years ended December 31, 2015 and 2014 : December 31, 2015 Year Ended (In thousands) Unpaid principal balance Recorded investment Total recorded investment Related allowance Average recorded investment Interest with no allowance with allowance Commercial: Commercial and industrial $ 272,161 $ 44,190 $ 163,729 $ 207,919 $ 30,538 $ 153,756 $ 7,506 Owner occupied 141,526 83,024 43,243 126,267 5,486 125,777 12,450 Municipal 1,430 951 — 951 — 994 — Total commercial 415,117 128,165 206,972 335,137 36,024 280,527 19,956 Commercial real estate: Construction and land development 22,791 5,076 9,558 14,634 618 16,192 6,410 Term 142,239 82,864 34,361 117,225 2,604 111,074 16,971 Total commercial real estate 165,030 87,940 43,919 131,859 3,222 127,266 23,381 Consumer: Home equity credit line 27,064 18,980 5,319 24,299 243 22,050 1,547 1-4 family residential 74,009 29,540 41,155 70,695 8,736 96,482 2,616 Construction and other consumer real estate 2,741 989 1,014 2,003 173 2,288 123 Bankcard and other revolving plans — — — — — 1 102 Other 3,187 36 2,570 2,606 299 3,781 838 Total consumer loans 107,001 49,545 50,058 99,603 9,451 124,602 5,226 Total $ 687,148 $ 265,650 $ 300,949 $ 566,599 $ 48,697 $ 532,395 $ 48,563 December 31, 2014 Year Ended (In thousands) Unpaid principal balance Recorded investment Total recorded investment Related allowance Average recorded investment Interest with no allowance with allowance Commercial: Commercial and industrial $ 185,520 $ 43,257 $ 103,565 $ 146,822 $ 22,852 $ 185,947 $ 10,803 Owner occupied 198,231 83,179 86,382 169,561 6,087 233,361 18,221 Municipal 1,535 1,056 — 1,056 — 9,208 — Total commercial 385,286 127,492 189,947 317,439 28,939 428,516 29,024 Commercial real estate: Construction and land development 60,993 16,500 26,977 43,477 1,773 61,068 6,384 Term 203,788 96,351 63,740 160,091 2,345 238,507 31,144 Total commercial real estate 264,781 112,851 90,717 203,568 4,118 299,575 37,528 Consumer: Home equity credit line 30,209 14,798 11,883 26,681 437 25,909 2,426 1-4 family residential 86,575 37,096 35,831 72,927 8,494 81,526 2,058 Construction and other consumer real estate 3,902 1,449 1,410 2,859 233 3,167 155 Bankcard and other revolving plans — — — — — 2 22 Other 6,580 — 5,254 5,254 133 7,585 1,665 Total consumer loans 127,266 53,343 54,378 107,721 9,297 118,189 6,326 Total $ 777,333 $ 293,686 $ 335,042 $ 628,728 $ 42,354 $ 846,280 $ 72,878 Modified and Restructured Loans Loans may be modified in the normal course of business for competitive reasons or to strengthen the Company’s position. Loan modifications and restructurings may also occur when the borrower experiences financial difficulty and needs temporary or permanent relief from the original contractual terms of the loan. These modifications are structured on a loan-by-loan basis and, depending on the circumstances, may include extended payment terms, a modified interest rate, forgiveness of principal, or other concessions. Loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for which the Company has granted a concession that it would not otherwise consider, are considered TDRs. We consider many factors in determining whether to agree to a loan modification involving concessions, and seek a solution that will both minimize potential loss to the Company and attempt to help the borrower. We evaluate borrowers’ current and forecasted future cash flows, their ability and willingness to make current contractual or proposed modified payments, the value of the underlying collateral (if applicable), the possibility of obtaining additional security or guarantees, and the potential costs related to a repossession or foreclosure and the subsequent sale of the collateral. TDRs are classified as either accrual or nonaccrual loans. A loan on nonaccrual and restructured as a TDR will remain on nonaccrual status until the borrower has proven the ability to perform under the modified structure for a minimum of six months, and there is evidence that such payments can and are likely to continue as agreed. Performance prior to the restructuring, or significant events that coincide with the restructuring, are included in assessing whether the borrower can meet the new terms and may result in the loan being returned to accrual at the time of restructuring or after a shorter performance period. If the borrower’s ability to meet the revised payment schedule is uncertain, the loan remains classified as a nonaccrual loan. A TDR loan that specifies an interest rate that at the time of the restructuring is greater than or equal to the rate the bank is willing to accept for a new loan with comparable risk may not be reported as a TDR or an impaired loan in the calendar years subsequent to the restructuring if it is in compliance with its modified terms. Selected information on TDRs at year-end that includes the recorded investment on an accruing and nonaccruing basis by loan class and modification type is summarized in the following schedules: December 31, 2015 Recorded investment resulting from the following modification types: (In thousands) Interest rate below market Maturity or term extension Principal forgiveness Payment deferral Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ 202 $ 3,236 $ 13 $ 100 $ 23,207 $ 34,473 $ 61,231 Owner occupied 1,999 681 929 — 9,879 16,339 29,827 Total commercial 2,201 3,917 942 100 33,086 50,812 91,058 Commercial real estate: Construction and land development 94 — — — — 9,698 9,792 Term 4,696 638 166 976 2,249 20,833 29,558 Total commercial real estate 4,790 638 166 976 2,249 30,531 39,350 Consumer: Home equity credit line 192 2,147 9,763 — 164 3,155 15,421 1-4 family residential 2,669 353 6,747 433 3,440 32,903 46,545 Construction and other consumer real estate 174 384 — — — 1,152 1,710 Total consumer loans 3,035 2,884 16,510 433 3,604 37,210 63,676 Total accruing 10,026 7,439 17,618 1,509 38,939 118,553 194,084 Nonaccruing Commercial: Commercial and industrial 28 455 — 1,879 3,577 49,617 55,556 Owner occupied 685 1,669 — 724 34 16,335 19,447 Municipal — 951 — — — — 951 Total commercial 713 3,075 — 2,603 3,611 65,952 75,954 Commercial real estate: Construction and land development — 333 — — 3,156 208 3,697 Term 1,844 — — — 2,960 5,203 10,007 Total commercial real estate 1,844 333 — — 6,116 5,411 13,704 Consumer: Home equity credit line 7 500 1,400 54 — 233 2,194 1-4 family residential — 275 2,052 136 1,180 7,299 10,942 Construction and other consumer real estate — 101 17 48 — 44 210 Bankcard and other revolving plans — — — — — — — Total consumer loans 7 876 3,469 238 1,180 7,576 13,346 Total nonaccruing 2,564 4,284 3,469 2,841 10,907 78,939 103,004 Total $ 12,590 $ 11,723 $ 21,087 $ 4,350 $ 49,846 $ 197,492 $ 297,088 December 31, 2014 Recorded investment resulting from the following modification types: (In thousands) Interest rate below market Maturity or term extension Principal forgiveness Payment deferral Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ 2,611 $ 6,509 $ 18 $ 3,203 $ 3,855 $ 34,585 $ 50,781 Owner occupied 19,981 1,124 960 1,251 10,960 17,505 51,781 Total commercial 22,592 7,633 978 4,454 14,815 52,090 102,562 Commercial real estate: Construction and land development — — — — 521 19,854 20,375 Term 7,328 9,027 179 3,153 2,546 39,007 61,240 Total commercial real estate 7,328 9,027 179 3,153 3,067 58,861 81,615 Consumer: Home equity credit line 742 70 11,320 — 166 1,281 13,579 1-4 family residential 2,425 552 6,828 446 753 34,719 45,723 Construction and other consumer real estate 290 422 42 90 — 1,227 2,071 Total consumer loans 3,457 1,044 18,190 536 919 37,227 61,373 Total accruing 33,377 17,704 19,347 8,143 18,801 148,178 245,550 Nonaccruing Commercial: Commercial and industrial 442 576 — 611 5,199 20,410 27,238 Owner occupied 2,714 1,219 — 883 2,852 12,040 19,708 Municipal — 1,056 — — — — 1,056 Total commercial 3,156 2,851 — 1,494 8,051 32,450 48,002 Commercial real estate: Construction and land development 11,080 68 — 93 3,300 6,427 20,968 Term 2,851 — — — 277 4,607 7,735 Total commercial real estate 13,931 68 — 93 3,577 11,034 28,703 Consumer: Home equity credit line — — 420 203 — 399 1,022 1-4 family residential 3,378 1,029 1,951 191 3,527 9,413 19,489 Construction and other

Derivative Instruments And Hedg

Derivative Instruments And Hedging Activities	12 Months Ended
	Dec. 31, 2015
Summary of Derivative Instruments [Abstract]
Derivative Instruments And Hedging Activities	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Objectives Our objectives in using derivatives are to add stability to interest income or expense, to modify the duration of specific assets or liabilities as we consider advisable, to manage exposure to interest rate movements or other identified risks, and/or to directly offset derivatives sold to our customers. We apply hedge accounting to certain derivatives executed for risk management purposes as described in more detail subsequently. However, we do not apply hedge accounting to all of the derivatives involved in our risk management activities. Derivatives not designated as accounting hedges are not speculative and are used to economically manage our exposure to interest rate movements and other identified risks, but do not meet the strict hedge accounting requirements. Accounting We record all derivatives on the balance sheet at fair value. Note 20 discusses the process to estimate fair value for derivatives. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative and the resulting designation. Derivatives used to hedge the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives used to hedge the exposure to variability in expected cash flows, or other types of forecasted transactions, are considered cash flow hedges. For derivatives designated as fair value hedges, changes in the fair value of the derivative are recognized in earnings together with changes in the fair value of the related hedged item. The net amount, if any, representing hedge ineffectiveness, is reflected in earnings. In previous years, we used fair value hedges to manage interest rate exposure to certain long-term debt. These hedges have been terminated and their remaining balances were completely amortized into earnings during 2015. For derivatives designated as cash flow hedges, the effective portion of changes in the fair value of the derivative are recorded in OCI and recognized in earnings when the hedged transaction affects earnings. The ineffective portion of changes in the fair value of cash flow hedges is recognized directly in earnings. We use interest rate swaps as part of our cash flow hedging strategy to hedge the variable cash flows associated with designated commercial loans. These interest rate swap agreements designated as cash flow hedges involve the receipt of fixed-rate amounts in exchange for variable-rate payments over the life of the agreements without exchange of the underlying notional amount. No derivatives have been designated for hedges of investments in foreign operations. We assess the effectiveness of each hedging relationship by comparing the changes in fair value or cash flows on the derivative hedging instrument with the changes in fair value or cash flows on the designated hedged item or transaction. For derivatives not designated as accounting hedges, changes in fair value are recognized in earnings. The remaining balances of any derivative instruments terminated prior to maturity, including amounts in accumulated other comprehensive income (“AOCI”) for swap hedges, are accreted or amortized to interest income or expense over the period to their previously stated maturity dates. Amounts in AOCI are reclassified to interest income as interest is earned on variable-rate loans and as amounts for terminated hedges are accreted or amortized to earnings. For the 12 months following December 31, 2015 , we estimate that an additional $6.0 million will be reclassified. Collateral and Credit Risk Exposure to credit risk arises from the possibility of nonperformance by counterparties. Financial institutions which are well capitalized and well established are the counterparties for those derivatives entered into for asset liability management and to offset derivatives sold to our customers. The Company reduces its counterparty exposure for derivative contracts by centrally clearing all eligible derivatives. For those derivatives that are not centrally cleared, the counterparties are typically financial institutions or customers of the Company. For those that are financial institutions, we manage our credit exposure through the use of a Credit Support Annex (“CSA”) to International Swaps and Derivative Association (“ISDA”) master agreements. Eligible collateral types are documented by the CSA and controlled under the Company’s general credit policies. They are typically monitored on a daily basis. A valuation haircut policy reflects the fact that collateral may fall in value between the date the collateral is called and the date of liquidation or enforcement. In practice, all of the Company’s collateral held as credit risk mitigation under a CSA is cash. We offer interest rate swaps to our customers to assist them in managing their exposure to changing interest rates. Upon issuance, all of these customer swaps are immediately offset through matching derivative contracts, such that the Company minimizes its interest rate risk exposure resulting from such transactions. Most of these customers do not have the capability for centralized clearing. Therefore we manage the credit risk through loan underwriting which includes a credit risk exposure formula for the swap, the same collateral and guarantee protection applicable to the loan and credit approvals, limits, and monitoring procedures. Fee income from customer swaps is included in other service charges, commissions and fees. No significant losses on derivative instruments have occurred as a result of counterparty nonperformance. Nevertheless, the related credit risk is considered and measured when and where appropriate. See Note 6 and 17 for further discussion of our underwriting, collateral requirements, and other procedures used to address credit risk. Our derivative contracts require us to pledge collateral for derivatives that are in a net liability position at a given balance sheet date. Certain of these derivative contracts contain credit-risk-related contingent features that include the requirement to maintain a minimum debt credit rating. We may be required to pledge additional collateral if a credit-risk-related feature were triggered, such as a downgrade of our credit rating. However, in past situations, not all counterparties have demanded that additional collateral be pledged when provided for under their contracts. At December 31, 2015 , the fair value of our derivative liabilities was $72.6 million , for which we were required to pledge cash collateral of approximately $56.6 million in the normal course of business. If our credit rating were downgraded one notch by either Standard & Poor’s or Moody’s at December 31, 2015 , the additional amount of collateral we could be required to pledge is approximately $1.6 million . As a result of the Dodd-Frank Act, all newly eligible derivatives entered into are cleared through a central clearinghouse. Derivatives that are centrally cleared do not have credit-risk-related features that require additional collateral if our credit rating were downgraded. Derivative Amounts Selected information with respect to notional amounts and recorded gross fair values at December 31, 2015 and 2014 , and the related gain (loss) of derivative instruments for the years then ended is summarized as follows: December 31, 2015 December 31, 2014 Notional amount Fair value Notional amount Fair value (In thousands) Other assets Other liabilities Other assets Other liabilities Derivatives designated as hedging instruments Cash flow hedges: 1 Interest rate swaps $ 1,387,500 $ 5,461 $ 956 $ 275,000 $ 1,508 $ 123 Total derivatives designated as hedging instruments 1,387,500 5,461 956 275,000 1,508 123 Derivatives not designated as hedging instruments Interest rate swaps 40,314 — 8 — — — Interest rate swaps for customers 2 3,256,190 51,353 53,843 2,770,052 48,287 50,669 Foreign exchange 463,064 20,824 17,761 443,721 16,625 15,272 Total derivatives not designated as hedging instruments 3,759,568 72,177 71,612 3,213,773 64,912 65,941 Total derivatives $ 5,147,068 $ 77,638 $ 72,568 $ 3,488,773 $ 66,420 $ 66,064 Year Ended December 31, 2015 Year Ended December 31, 2014 Amount of derivative gain (loss) recognized/reclassified (In thousands) OCI Reclassified from AOCI to interest income Noninterest income (expense) Offset to interest expense OCI Reclassified from AOCI to interest income Noninterest income (expense) Offset to interest expense Derivatives designated as hedging instruments Cash flow hedges: 1 Interest rate swaps $ 12,124 $ 9,004 $ 4,361 $ 2,594 12,124 9,004 3 4,361 2,594 3 Fair value hedges: Terminated swaps on long-term debt $ 1,504 $ 2,309 Total derivatives designated as hedging instruments 12,124 9,004 1,504 4,361 2,594 2,309 Derivatives not designated as hedging instruments Interest rate swaps $ — $ 355 Interest rate swaps for customers 2 7,438 467 Futures contracts 2 — Foreign exchange 9,519 8,344 Total return swap — (7,894 ) Total derivatives not designated as hedging instruments 16,959 1,272 Total derivatives $ 12,124 $ 9,004 $ 16,959 $ 1,504 $ 4,361 $ 2,594 $ 1,272 $ 2,309 Note: These schedules are not intended to present at any given time the Company’s long/short position with respect to its derivative contracts. 1 Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). 2 Amounts include both the customer swaps and the offsetting derivative contracts. 3 Amounts of $9.0 million for 2015 and $2.6 million for 2014 are the amounts of reclassification to earnings presented in the tabular changes of AOCI in Note 13. The fair value of derivative assets was reduced by a net credit valuation adjustment of $2.4 million at both December 31, 2015 and 2014 . The adjustment for derivative liabilities was not significant at December 31, 2015 and 2014 . These adjustments are required to reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Disclosure [Text Block]	. PREMISES AND EQUIPMENT Premises and equipment are summarized as follows: (In thousands) December 31, 2015 2014 Land $ 229,693 $ 233,300 Buildings 598,643 551,603 Furniture and equipment 459,975 458,703 Leasehold improvements 138,765 133,624 Software 295,428 239,670 Total 1,722,504 1,616,900 Less accumulated depreciation and amortization 817,042 787,091 Net book value $ 905,462 $ 829,809

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	. GOODWILL AND OTHER INTANGIBLE ASSETS Core deposit and other intangible assets and related accumulated amortization are as follows at December 31 : Gross carrying amount Accumulated amortization Net carrying amount (In thousands) 2015 2014 2015 2014 2015 2014 Core deposit intangibles $ 166,518 $ 170,688 $ (151,157 ) $ (146,842 ) $ 15,361 $ 23,846 Customer relationships and other intangibles 28,014 28,014 (27,103 ) (26,340 ) 911 1,674 Total $ 194,532 $ 198,702 $ (178,260 ) $ (173,182 ) $ 16,272 $ 25,520 The amount of amortization expense of core deposit and other intangible assets is separately reflected in the statement of income. Estimated amortization expense for core deposit and other intangible assets is as follows for the five years succeeding December 31, 2015 : (In thousands) 2016 $ 7,888 2017 6,369 2018 1,556 2019 459 2020 — Changes in the carrying amount of goodwill for operating segments with goodwill are as follows: (In thousands) Zions Bank CB&T Amegy Consolidated Company Balance at December 31, 2013 $ 19,514 $ 379,024 $ 615,591 $ 1,014,129 Impairment losses — — — — Balance at December 31, 2014 19,514 379,024 615,591 1,014,129 Impairment losses — — — — Balance at December 31, 2015 $ 19,514 $ 379,024 $ 615,591 $ 1,014,129 A Company-wide annual impairment test is conducted as of October 1 of each year and updated on a more frequent basis when events or circumstances indicate that impairment could have taken place. Results of the testing for 2015 and 2014 concluded that no impairment was present in any of the operating segments.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2015
Deposits [Abstract]
Deposit Liabilities Disclosures [Text Block]	10. DEPOSITS At December 31, 2015 , the scheduled maturities of all time deposits were as follows: (In thousands) 2016 $ 1,667,431 2017 248,709 2018 128,548 2019 86,471 2020 110,674 Thereafter 973 Total $ 2,242,806 At December 31, 2015 , the contractual maturities of domestic time deposits with a denomination of $100,000 and over were as follows: $334 million in 3 months or less, $219 million over 3 months through 6 months, $278 million over 6 months through 12 months, and $300 million over 12 months. Domestic time deposits in denominations that meet or exceed the current FDIC insurance limit of $250,000 were $584 million and $657 million at December 31, 2015 and 2014 , respectively. Domestic time deposits under $250,000 were $1.5 billion and $1.7 billion at December 31, 2015 and 2014 , respectively. Foreign time deposits $250,000 and over were $112 million and $135 million at December 31, 2015 and 2014 , respectively. Deposit overdrafts reclassified as loan balances were $14 million and $15 million at December 31, 2015 and 2014 , respectively.

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2015
Short-term Debt [Abstract]
Short-Term Borrowings	11. SHORT-TERM BORROWINGS Selected information for federal funds and other short-term borrowings is as follows: (Amounts in thousands) 2015 2014 2013 Federal funds purchased Average amount outstanding $ 105,910 $ 104,358 $ 150,217 Weighted average rate 0.18 % 0.17 % 0.15 % Highest month-end balance 122,461 124,093 206,450 Year-end balance 111,263 100,193 129,131 Weighted average rate on outstandings at year-end 0.25 % 0.15 % 0.14 % Security repurchase agreements Average amount outstanding 127,358 116,190 124,929 Weighted average rate 0.11 % 0.06 % 0.05 % Highest month-end balance 205,566 156,710 137,611 Year-end balance 205,566 118,600 137,611 Weighted average rate on outstandings at year-end 0.15 % 0.13 % 0.05 % Other short-term borrowings , year-end balances Securities sold, not yet purchased 30,158 24,230 73,606 Other — 1,200 — Total federal funds and other short-term borrowings $ 346,987 $ 244,223 $ 340,348 Federal funds purchased and security repurchase agreements generally mature in less than 30 days. Our participation in security repurchase agreements is on an overnight or term basis (e.g., 30 or 60 days). Our subsidiary bank executes overnight repurchase agreements with sweep accounts in conjunction with a master repurchase agreement. When this occurs, securities under their control are pledged and interest is paid on the collected balance of the customers’ accounts. For term repurchase agreements, securities are transferred to the applicable counterparty. The counterparty, in certain instances, is contractually entitled to sell or repledge securities accepted as collateral. Of the total security repurchase agreements at December 31, 2015 , $63 million were overnight and $143 million were term. Prior to the consolidation of our subsidiary bank charters on December 31, 2015, the subsidiary banks could borrow from the FHLB under their lines of credit that are secured under blanket pledge arrangements. The subsidiary banks maintained unencumbered collateral with carrying amounts adjusted for the types of collateral pledged, equal to at least 100% of the outstanding advances. At December 31, 2015 , the amount available for FHLB advances was approximately $9.1 billion and no short-term FHLB advances were outstanding. Additionally, prior to the consolidation of our subsidiary bank charters on December 31, 2015, the subsidiary banks could also borrow from the Federal Reserve based on the amount of collateral pledged to a Federal Reserve Bank. At December 31, 2015 , the amount available for additional Federal Reserve borrowings was approximately $4.3 billion .

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2015
Long-term Debt, Unclassified [Abstract]
Debt Disclosure [Text Block]	LONG-TERM DEBT Long-term debt is summarized as follows: December 31, (In thousands) 2015 2014 Junior subordinated debentures related to trust preferred securities $ 164,950 $ 168,043 Convertible subordinated notes — 132,838 Subordinated notes 249,891 335,798 Senior notes 401,595 432,385 FHLB advances — 22,156 Capital lease obligations 912 1,062 Total $ 817,348 $ 1,092,282 The preceding amounts represent the par value of the debt adjusted for any unamortized premium or discount or other basis adjustments, including the value of associated hedges for 2014. Trust Preferred Securities Junior subordinated debentures related to trust preferred securities issued to the following trusts were outstanding at December 31, 2015 as follows: (Amounts in thousands) Balance Coupon rate 1 Maturity Amegy Statutory Trust I $ 51,547 3mL+2.85% (3.38%) Dec 2033 Amegy Statutory Trust II 36,083 3mL+1.90% (2.22%) Oct 2034 Amegy Statutory Trust III 61,856 3mL+1.78% (2.29%) Dec 2034 Stockmen’s Statutory Trust II 7,732 3mL+3.15% (3.75%) Mar 2033 Stockmen’s Statutory Trust III 7,732 3mL+2.89% (3.42%) Mar 2034 Total $ 164,950 1 Designation of “3mL” is three-month LIBOR; effective interest rate at the beginning of the accrual period commencing on or before December 31, 2015 is shown in parenthesis. The junior subordinated debentures for the Amegy and Stockmen’s Trusts were assumed by the Parent through previous acquisitions and mergers, and are direct and unsecured obligations of the Parent. They are subordinate to other indebtedness and general creditors. The Parent has assumed the unconditional guarantees of the obligations of the Amegy and Stockmen’s trusts with respect to their respective series of trust preferred securities to the extent set forth in the applicable guarantee agreements. Each trust has issued a corresponding series of trust preferred security obligations. The trust obligations are in the form of capital securities subject to mandatory redemption upon repayment of the junior subordinated debentures by the Parent. The sole assets of the trusts are the junior subordinated debentures. Interest distributions are made quarterly at the same rates earned by the trusts on the junior subordinated debentures; however, we may defer the payment of interest on the junior subordinated debentures. Early redemption is currently possible on all of the debentures and requires the approval of banking regulators. Subordinated Notes Subordinated notes consist of the following at December 31, 2015 : (Amounts in thousands) Subordinated notes Coupon rate Balance Par amount Maturity 5.65% $ 162,000 $ 162,000 Nov 2023 6.95% 87,891 87,891 Sep 2028 Total $ 249,891 $ 249,891 These notes are unsecured, and interest is payable quarterly on the 6.95% notes and semiannually on the 5.65% notes. For the 6.95% notes, interest payments commenced December 15, 2013 to the earliest possible redemption date of September 15, 2023 , after which the interest rate changes to an annual floating rate equal to 3mL+3.89% . Interest payments on the 5.65% notes commenced May 15, 2014 to the earliest possible redemption date of November 15, 2018 , after which they are payable quarterly at an annual floating rate equal to 3mL+4.19% . Senior Notes Senior notes consist of the following at December 31, 2015 : (Amounts in thousands) Senior notes Coupon rate Balance Par amount Maturity 4.00% $ 88,210 $ 89,360 Jun 2016 4.50% 160,950 163,857 Mar 2017 4.50% 141,328 145,231 Jun 2023 3.60% 11,107 11,108 July 2018 Total $ 401,595 $ 409,556 These notes are unsecured and interest is payable semiannually. The notes were issued under a shelf registration filed with the SEC and were sold via the Company’s online auction process and direct sales. The notes are not redeemable prior to maturity except for the $11.1 million notes that have an optional early redemption in June 2016. Debt Redemptions and Repurchases We redeemed or repurchased the following amounts of long-term debt during 2015 and 2014 : (Amounts in thousands) 2015 2014 Note type Coupon rate Par amount Coupon rate Par amount Trust preferred 3mL + 2.85% $ 3,093 Convertible subordinated notes 5.65 % $ 75,674 6.00 % 79,276 5.50 % 71,592 150,868 75,674 Subordinated notes 5.65 % 30,173 3mL+1.25% 75,000 6.00 % 32,366 5.50 % 52,078 84,444 105,173 Senior notes 7.75 % 240,769 4.0%, 4.5% 499,980 3.50 % 50,000 2.55% - 5.50% 247,512 3.30% - 3.70% 27,281 27,281 1,038,261 FHLB Advances 22,009 Total $ 287,695 $ 1,219,108 Debt Extinguishment Costs Debt extinguishment costs are as follows for the years 2015 , 2014 and 2013 : (In thousands) 2015 2014 2013 Early tender premiums $ 2,395 $ 33,971 $ 45,812 Write-offs of unamortized debt discount and issuance costs and fees 135 10,451 74,380 Total $ 2,530 $ 44,422 $ 120,192 Maturities of Long-term Debt Maturities of long-term debt are as follows for the years succeeding December 31, 2015 : (In thousands) Consolidated Parent only 2016 $ 88,382 $ 88,210 2017 161,147 160,951 2018 11,332 11,107 2019 259 — 2020 60 — Thereafter 556,168 556,168 Total $ 817,348 $ 816,436 The $556.2 million of Parent only maturities payable after 2020 consist of the $165.0 million of trust preferred securities and $391.2 million of senior notes.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2015
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Shareholders' Equity	13. SHAREHOLDERS’ EQUITY Preferred Stock Preferred stock is without par value and has a liquidation preference of $1,000 per share, or $25 per depositary share. Except for Series I and J, all preferred shares were issued in the form of depositary shares, with each depositary share representing a 1/40 th ownership interest in a share of the preferred stock. All preferred shares are registered with the SEC. In general, preferred shareholders may receive asset distributions before common shareholders; however, preferred shareholders have only limited voting rights generally with respect to certain provisions of the preferred stock, the issuance of senior preferred stock, and the election of directors. Preferred stock dividends reduce earnings available to common shareholders and are paid on the 15th day of the months indicated in the following schedule. Dividends are approved by the Board of Directors and are subject to regulatory non-objection to a stress test and capital plan submitted to the Federal Reserve pursuant to the annual Comprehensive Capital Analysis and Review (“CCAR”) process. Redemption of the preferred stock is at the Company’s option after the expiration of any applicable redemption restrictions. The redemption amount is computed at the per share liquidation preference plus any declared but unpaid dividends. Redemptions are subject to certain regulatory provisions, including the previously noted capital plan non-objection for a submitted capital plan in a given year. Preferred stock is summarized as follows: (Amounts in thousands except share amounts) Carrying value at Shares at Dividends payable Earliest redemption date Rate following earliest redemption date Dividends payable after rate change 2015 2014 Authorized Outstanding Rate (when applicable) Series A $ 66,316 $ 66,168 140,000 66,139 > of 4.0% or 3mL+0.52% Qtrly Mar,Jun,Sep,Dec Dec 15, 2011 Series F 143,750 143,750 250,000 143,750 7.9% Qtrly Mar,Jun,Sep,Dec Jun 15, 2017 Series G 171,827 171,827 200,000 171,827 6.3% Qtrly Mar,Jun,Sep,Dec Mar 15, 2023 annual float-ing rate = 3mL+4.24% Series H 126,221 126,221 126,221 126,221 5.75% Qtrly Mar,Jun,Sep,Dec Jun 15, 2019 Series I 125,224 300,893 300,893 125,224 5.8% Semi-annually Jun,Dec Jun 15, 2023 annual float-ing rate = 3mL+3.8% Qtrly Mar,Jun,Sep,Dec Series J 195,152 195,152 195,152 195,152 7.2% Semi-annually Mar,Sep Sep 15, 2023 annual float-ing rate = 3mL+4.44% Qtrly Mar,Jun,Sep,Dec Total $ 828,490 $ 1,004,011 Preferred Stock Redemptions Effective November 18, 2015, we redeemed approximately $175.7 million of Series I preferred stock through a cash tender offer. The offer amount of $180 million , or $24.65 per share, differed from the redemption amount by approximately $4.3 million of accrued dividends. The size and terms of the offer were determined in accordance with the Company’s 2015 capital plan. In September 2013, we redeemed all of the outstanding $800 million par amount of Series C preferred stock through the issuance of an aggregate equivalent amount of other series of preferred stock. The reduction of $926 million carrying value in preferred stock differed from the par amount by $126 million , which was the intrinsic value of the beneficial conversion feature (“BCF”) associated with the convertible subordinated debt. The BCF had been accumulating as the convertible subordinated debt was converted to the Series C preferred stock. The $126 million BCF transfer was recorded as a preferred stock redemption in the 2013 statement of income. As shown in Note 12, the remaining convertible subordinated debt matured during 2015. Common Stock In July 2014 , we issued $525 million of common stock, which consisted of approximately 17.6 million shares at a price of $29.80 per share. Net of commissions and fees, this issuance added approximately $516 million to common stock and was permitted under the Company’s resubmitted capital plan. Common Stock Warrants We have 5.8 million common stock warrants at an exercise price of $36.27 per share which expire November 14, 2018 . These warrants were associated with the preferred stock issued under the Troubled Asset Relief Program (“TARP”) which was redeemed in 2012. In addition, we have issued a total of 29.3 million common stock warrants which can be exercised at a price of $36.14 as of December 31, 2015 through May 22, 2020. Accumulated Other Comprehensive Income Changes in AOCI by component are as follows: (In thousands) Net unrealized gains (losses) on investment securities Net unrealized gains (losses) on derivatives and other Pension and post-retirement Total 2015 Balance at December 31, 2014 $ (91,921 ) $ 2,226 $ (38,346 ) $ (128,041 ) Other comprehensive income (loss) before reclassifications, net of tax (12,471 ) 4,903 (3,161 ) (10,729 ) Amounts reclassified from AOCI, net of tax 86,023 (5,583 ) 3,718 84,158 Other comprehensive income (loss) 73,552 (680 ) 557 73,429 Balance at December 31, 2015 $ (18,369 ) $ 1,546 $ (37,789 ) $ (54,612 ) Income tax expense (benefit) included in other comprehensive income (loss) $ 48,422 $ (331 ) $ 374 $ 48,465 2014 Balance at December 31, 2013 $ (168,805 ) $ 1,556 $ (24,852 ) $ (192,101 ) Other comprehensive income (loss) before reclassifications, net of tax 82,204 2,275 (15,284 ) 69,195 Amounts reclassified from AOCI, net of tax (5,320 ) (1,605 ) 1,790 (5,135 ) Other comprehensive income (loss) 76,884 670 (13,494 ) 64,060 Balance at December 31, 2014 $ (91,921 ) $ 2,226 $ (38,346 ) $ (128,041 ) Income tax expense (benefit) included in other comprehensive income (loss) $ 60,795 $ 467 $ (8,764 ) $ 52,498 Statement of Income (SI) Balance Sheet (BS) (In thousands) Amounts reclassified from AOCI 1 Details about AOCI components 2015 2014 2013 Affected line item Net realized gains (losses) on investment securities $ (138,735 ) $ 10,419 $ (2,898 ) SI Fixed income securities gains (losses), net Income tax expense (benefit) (52,712 ) 3,971 (1,123 ) (86,023 ) 6,448 (1,775 ) Net unrealized losses on investment securities — (27 ) (164,732 ) SI Net impairment losses on investment securities Income tax benefit — (10 ) (64,829 ) — (17 ) (99,903 ) Accretion of securities with noncredit-related impairment losses not expected to be sold — (1,878 ) (2,106 ) BS Investment securities, held-to-maturity Deferred income taxes — 767 848 BS Other assets $ (86,023 ) $ 5,320 $ (102,936 ) Net unrealized gains on derivative instruments $ 9,004 $ 2,594 $ 2,647 SI Interest and fees on loans Income tax expense 3,421 989 1,067 $ 5,583 $ 1,605 $ 1,580 Amortization of net actuarial loss $ (5,996 ) $ (2,843 ) $ (8,127 ) SI Salaries and employee benefits Amortization of prior service credit (cost) — (50 ) 27 SI Salaries and employee benefits Income tax benefit (2,278 ) (1,103 ) (3,194 ) $ (3,718 ) $ (1,790 ) $ (4,906 ) 1 Negative reclassification amounts indicate decreases to earnings in the statement of income and increases to balance sheet assets. The opposite applies to positive reclassification amounts. Deferred Compensation Deferred compensation consists of invested assets, including the Company’s common stock, which are held in rabbi trusts for certain employees and directors. At December 31, 2015 and 2014 , the cost of the common stock included in retained earnings was approximately $15.2 million and $14.3 million , respectively. We consolidate the fair value of invested assets of the trusts along with the total obligations and include them in other assets and other liabilities, respectively, in the balance sheet. At December 31, 2015 and 2014 , total invested assets were approximately $81.8 million and $86.6 million and total obligations were approximately $96.9 million and $100.9 million , respectively. Noncontrolling Interests In 2013, we removed the entire noncontrolling interest amount of approximately $4.8 million from the Company’s balance sheet following settlement with the remaining owner.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Taxes [Abstract]
Income Taxes	INCOME TAXES Income tax expense is summarized as follows: (In thousands) 2015 2014 2013 Federal: Current $ 158,164 $ 178,450 $ 173,418 Deferred (31,843 ) 14,277 (51,475 ) 126,321 192,727 121,943 State: Current 14,027 18,573 29,676 Deferred 2,040 11,661 (8,642 ) 16,067 30,234 21,034 $ 142,388 $ 222,961 $ 142,977 Income tax expense computed at the statutory federal income tax rate of 35% reconciles to actual income tax expense as follows: (In thousands) 2015 2014 2013 Income tax expense at statutory federal rate $ 158,151 $ 217,498 $ 142,251 State income taxes including credits, net 10,443 19,652 13,672 Other nondeductible expenses 3,205 2,949 2,574 Nontaxable income (20,397 ) (17,869 ) (17,071 ) Tax credits and other taxes (2,926 ) (1,717 ) (2,628 ) Other (6,088 ) 2,448 4,179 $ 142,388 $ 222,961 $ 142,977 The tax effects of temporary differences that give rise to significant portions of the deferred tax assets (“DTA”) and deferred tax liabilities are presented below: (In thousands) December 31, 2015 2014 Gross deferred tax assets: Book loan loss deduction in excess of tax $ 254,223 $ 258,488 Pension and postretirement 24,749 25,142 Deferred compensation 91,665 93,023 Security investments and derivative fair value adjustments 11,254 22,440 Net operating losses, capital losses and tax credits 4,659 5,442 FDIC-supported transactions 9,157 15,636 Other 46,016 46,521 441,723 466,692 Valuation allowance (4,261 ) (4,261 ) Total deferred tax assets 437,462 462,431 Gross deferred tax liabilities: Core deposits and purchase accounting (3,392 ) (6,559 ) Premises and equipment, due to differences in depreciation (10,588 ) (10,361 ) FHLB stock dividends (10,042 ) (12,376 ) Leasing operations (85,255 ) (76,148 ) Prepaid expenses (9,001 ) (9,337 ) Prepaid pension reserves (18,087 ) (18,491 ) Mortgage servicing (6,845 ) (5,834 ) Subordinated debt modification (46,451 ) (64,030 ) Deferred loan fees (23,723 ) (22,774 ) Equity investments (21,037 ) (12,262 ) Total deferred tax liabilities (234,421 ) (238,172 ) Net deferred tax assets $ 203,041 $ 224,259 The amount of net DTAs is included with other assets in the balance sheet. The $4.3 million valuation allowance at December 31, 2015 and 2014 was for certain acquired net operating loss carryforwards included in our acquisition of the remaining interests in a less significant subsidiary. At December 31, 2015 , excluding the $4.3 million , the tax effect of remaining net operating loss and tax credit carryforwards was approximately $0.4 million expiring through 2030 . We evaluate the net DTAs on a regular basis to determine whether an additional valuation allowance is required. In conducting this evaluation, we have considered all available evidence, both positive and negative, based on the more likely than not criteria that such assets will be realized. This evaluation includes, but is not limited to: (1) available carryback potential to prior tax years; (2) potential future reversals of existing deferred tax liabilities, which historically have a reversal pattern generally consistent with DTAs; (3) potential tax planning strategies; and (4) future projected taxable income. Based on this evaluation, and considering the weight of the positive evidence compared to the negative evidence, we have concluded that an additional valuation allowance is not required as of December 31, 2015 . We have a liability for unrecognized tax benefits relating to uncertain tax positions primarily for various state tax contingencies in several jurisdictions. A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows: (In thousands) 2015 2014 2013 Balance at beginning of year $ 3,255 $ 2,385 $ 2,385 Tax positions related to current year: Additions 786 — — Reductions — — — Tax positions related to prior years: Additions 1,407 870 — Reductions — — — Settlements with taxing authorities — — — Lapses in statutes of limitations — — — Balance at end of year $ 5,448 $ 3,255 $ 2,385 At December 31, 2015 and 2014 , the liability for unrecognized tax benefits included approximately $3.9 million and $2.1 million , respectively (net of the federal tax benefit on state issues) that, if recognized, would affect the effective tax rate. There is approximately $3.3 million of gross unrecognized tax benefits that may decrease during the 12 months subsequent to December 31, 2015 . Interest and penalties related to unrecognized tax benefits are included in income tax expense in the statement of income. At December 31, 2015 and 2014 , accrued interest and penalties recognized in the balance sheet, net of any federal and/or state tax benefits, were approximately $0.7 million and $0.6 million , respectively. The Company and its subsidiaries file income tax returns in U.S. federal and various state jurisdictions. The Company is no longer subject to income tax examinations for years prior to 2012 for federal returns and 2007 for certain state returns.

Net Earnings Per Common Share

Net Earnings Per Common Share	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Net Earnings Per Common Share	15. NET EARNINGS PER COMMON SHARE Basic and diluted net earnings per common share based on the weighted average outstanding shares are summarized as follows: (In thousands, except per share amounts) 2015 2014 2013 Basic: Net income applicable to controlling interest $ 309,471 $ 398,462 $ 263,791 Less common and preferred dividends 107,990 103,111 (6,094 ) Undistributed earnings 201,481 295,351 269,885 Less undistributed earnings applicable to nonvested shares 1,836 2,933 2,832 Undistributed earnings applicable to common shares 199,645 292,418 267,053 Distributed earnings applicable to common shares 44,816 30,983 23,916 Total earnings applicable to common shares $ 244,461 $ 323,401 $ 290,969 Weighted average common shares outstanding 203,265 192,207 183,844 Net earnings per common share $ 1.20 $ 1.68 $ 1.58 Diluted: Total earnings applicable to common shares $ 244,461 $ 323,401 $ 290,969 Additional undistributed earnings allocated to incremental shares — — — Diluted earnings applicable to common shares $ 244,461 $ 323,401 $ 290,969 Weighted average common shares outstanding 203,265 192,207 183,844 Additional weighted average dilutive shares 433 582 453 Weighted average diluted common shares outstanding 203,698 192,789 184,297 Net earnings per common share $ 1.20 $ 1.68 $ 1.58 For 2013, preferred dividends were offset by a preferred stock redemption of approximately $126 million that resulted from the redemption of the Company’s Series C preferred stock. See further discussion in Note 13.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation	16. SHARE-BASED COMPENSATION We have a stock option and incentive plan which allows us to grant stock options, restricted stock, restricted stock units (“RSUs”), and other awards to employees and nonemployee directors. Total shares authorized under the plan were 9,000,000 at December 31, 2015 , of which 7,523,768 were available for future grants. All share-based payments to employees, including grants of employee stock options, are recognized in the statement of income based on their fair values. The fair value of an equity award is estimated on the grant date without regard to service or performance vesting conditions. We classify all share-based awards as equity instruments. Compensation expense is included in salaries and employee benefits in the statement of income, with the corresponding increase included in common stock. Substantially all awards of stock options, restricted stock, and RSUs have graded vesting that is recognized on a straight-line basis over the vesting period. Compensation expense and the related tax benefit for all share-based awards were as follows: (In thousands) 2015 2014 2013 Compensation expense $ 24,974 $ 23,632 $ 28,052 Reduction of income tax expense 8,284 7,767 9,123 As of December 31, 2015 , compensation expense not yet recognized for nonvested share-based awards was approximately $26.6 million , which is expected to be recognized over a weighted average period of 2.4 years. The tax effects recognized from the exercise of stock options and the vesting of restricted stock and RSUs decreased common stock by approximately $0.8 million in 2015 , and increased common stock by approximately $0.4 million in 2014 , and $0.3 million in 2013. These amounts are included in the net activity under employee plans and related tax benefits in the statement of changes in shareholders’ equity. Stock Options Stock options granted to employees generally vest at the rate of one third each year and expire seven years after the date of grant. For all stock options granted in 2015 , 2014 , and 2013 , we used the Black-Scholes option pricing model to estimate the fair values of stock options in determining compensation expense. The following summarizes the weighted average of fair value and the significant assumptions used in applying the Black-Scholes model for options granted: 2015 2014 2013 Weighted average of fair value for options granted $ 6.17 $ 6.10 $ 6.79 Weighted average assumptions used: Expected dividend yield 1.3 % 1.3 % 1.3 % Expected volatility 25.0 % 25.1 % 32.5 % Risk-free interest rate 1.57 % 1.55 % 0.78 % Expected life (in years) 5.0 5.0 4.5 The assumptions for expected dividend yield, expected volatility, and expected life reflect management’s judgment and include consideration of historical experience. Expected volatility is based in part on historical volatility. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option. The following summarizes our stock option activity for the three years ended December 31, 2015 : Number of shares Weighted average exercise price Balance at December 31, 2012 5,962,325 $ 38.87 Granted 1,047,781 27.41 Exercised (488,479 ) 20.11 Expired (574,157 ) 70.12 Forfeited (72,880 ) 22.25 Balance at December 31, 2013 5,874,590 35.54 Granted 947,758 28.67 Exercised (489,905 ) 21.60 Expired (618,207 ) 73.28 Forfeited (83,734 ) 25.72 Balance at December 31, 2014 5,630,502 31.60 Granted 740,300 29.01 Exercised (1,165,287 ) 25.11 Expired (1,322,067 ) 48.44 Forfeited (79,353 ) 28.09 Balance at December 31, 2015 3,804,095 27.30 Outstanding stock options exercisable as of: December 31, 2015 2,187,259 $ 26.35 December 31, 2014 3,804,873 33.86 December 31, 2013 4,101,928 40.40 We issue new authorized shares for the exercise of stock options. The total intrinsic value of stock options exercised was approximately $6.7 million in 2015 , $3.9 million in 2014 , and $4.0 million in 2013 . Cash received from the exercise of stock options was $22.7 million in 2015 , $10.6 million in 2014 , and $9.8 million in 2013 . Additional selected information on stock options at December 31, 2015 follows: Outstanding stock options Exercisable stock options Number of shares Weighted average exercise price Weighted average remaining contractual life (years) Exercise price range Number of shares Weighted average exercise price $ 0.32 to $19.99 552,618 $ 17.20 2.6 1 552,618 $ 17.20 $20.00 to $24.99 709,462 23.84 1.9 700,060 23.83 $25.00 to $29.99 2,344,883 28.35 5.3 772,369 27.88 $30.00 to $44.99 52,379 30.10 4.3 17,459 30.10 $45.00 to $59.99 70,200 47.10 2.2 70,200 47.10 $60.00 to $79.99 2,553 72.08 1.1 2,553 72.08 $80.00 to $81.99 36,000 80.65 0.3 36,000 80.65 $82.00 to $83.38 36,000 83.38 1.4 36,000 83.38 3,804,095 27.30 4.1 1 2,187,259 26.35 1 The weighted average remaining contractual life excludes 21,252 stock options without a fixed expiration date that were assumed with the Amegy acquisition. They expire between the date of termination and one year from the date of termination, depending upon certain circumstances. The aggregate intrinsic value of outstanding stock options at December 31, 2015 and 2014 was $8.0 million and $14.4 million , respectively, while the aggregate intrinsic value of exercisable options was $8.0 million and $11.3 million at the same respective dates. For exercisable options, the weighted average remaining contractual life was 3.1 years and 1.8 years at December 31, 2015 and 2014 , respectively, excluding the stock options previously noted without a fixed expiration date. At December 31, 2015 , 1,579,501 stock options with a weighted average exercise price of $28.59 , a weighted average remaining life of 5.6 years, and an aggregate intrinsic value of $27.3 thousand , were expected to vest. Restricted Stock and Restricted Stock Units Restricted stock is common stock with certain restrictions that relate to trading and the possibility of forfeiture. Generally, restricted stock vests over four years. Holders of restricted stock have full voting rights and receive dividend equivalents during the vesting period. In addition, holders of restricted stock can make an election to be subject to income tax on the grant date rather than the vesting date. RSUs represent rights to one share of common stock for each unit and generally vest over four years. Holders of RSUs receive dividend equivalents during the vesting period, but do not have voting rights. Compensation expense is determined based on the number of restricted shares or RSUs granted and the market price of our common stock at the issue date. Nonemployee directors were granted 31,080 RSUs in 2015 ; 16,670 shares of restricted stock and 6,656 RSUs in 2014 ; and 17,444 shares of restricted stock and 4,984 RSUs in 2013 . The 2015 RSUs vested immediately upon grant, and the 2014 and 2013 awards vested over six months. The following summarizes our restricted stock activity for the three years ended December 31, 2015 : Number of shares Weighted average issue price Nonvested restricted shares at December 31, 2012 851,236 $ 22.07 Issued 56,774 24.55 Vested (452,743 ) 21.80 Forfeited (44,317 ) 24.31 Nonvested restricted shares at December 31, 2013 410,950 22.46 Issued 16,670 28.87 Vested (256,890 ) 23.23 Forfeited (9,510 ) 23.68 Nonvested restricted shares at December 31, 2014 161,220 21.82 Issued 22,441 29.02 Vested (123,161 ) 22.32 Forfeited (1,130 ) 23.54 Nonvested restricted shares at December 31, 2015 59,370 23.49 The following summarizes our RSU activity for the three years ended December 31, 2015 : Number of restricted stock units Weighted average grant price Restricted stock units at December 31, 2012 822,753 $ 19.04 Granted 949,418 25.99 Vested (160,580 ) 20.17 Forfeited (89,553 ) 20.13 Restricted stock units at December 31, 2013 1,522,038 23.19 Granted 727,300 28.81 Vested (416,755 ) 22.26 Forfeited (63,163 ) 25.48 Restricted stock units at December 31, 2014 1,769,420 25.64 Granted 790,929 29.06 Vested (673,385 ) 24.78 Forfeited (88,421 ) 27.17 Restricted stock units at December 31, 2015 1,798,543 27.39 The total fair value at grant date of restricted stock and RSUs vested during the year was $19.4 million in 2015 , $15.2 million in 2014 , and $13.1 million in 2013 . At December 31, 2015 , 59,370 shares of restricted stock and 1,192,702 RSUs were expected to vest with an aggregate intrinsic value of $1.6 million and $32.6 million , respectively.

Commitments, Guarantees, Contin

Commitments, Guarantees, Contingent Liabilities, and Related Parties	12 Months Ended
	Dec. 31, 2015
Guarantees, Commitments And Contingencies [Abstract]
Commitments Contingencies and Guarantees [Text Block]	17. COMMITMENTS, GUARANTEES, CONTINGENT LIABILITIES, AND RELATED PARTIES Commitments and Guarantees We use certain financial instruments, including derivative instruments, in the normal course of business to meet the financing needs of our customers, to reduce our own exposure to fluctuations in interest rates, and to make a market in U.S. Government, agency, corporate, and municipal securities. These financial instruments involve, to varying degrees, elements of credit, liquidity, and interest rate risk in excess of the amounts recognized in the balance sheet. Derivative instruments are discussed in Notes 7 and 20. Contractual amounts of the off-balance sheet financial instruments used to meet the financing needs of our customers are as follows: December 31, (In thousands) 2015 2014 Net unfunded commitments to extend credit 1 $ 17,169,785 $ 16,658,757 Standby letters of credit: Financial 661,554 745,895 Performance 216,843 183,482 Commercial letters of credit 18,447 32,144 Total unfunded lending commitments $ 18,066,629 $ 17,620,278 1 Net of participations. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require the payment of a fee. The amount of collateral obtained, if deemed necessary by us upon extension of credit, is based on our initial credit evaluation of the counterparty. Types of collateral vary, but may include accounts receivable, inventory, property, plant and equipment, and income-producing properties. While establishing commitments to extend credit creates credit risk, a significant portion of such commitments is expected to expire without being drawn upon. As of December 31, 2015 , $4.9 billion of commitments expire in 2016 . We use the same credit policies and procedures in making commitments to extend credit and conditional obligations as we do for on-balance sheet instruments. These policies and procedures include credit approvals, limits, and monitoring. We issue standby and commercial letters of credit as conditional commitments generally to guarantee the performance of a customer to a third party. The guarantees are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing, and similar transactions. Standby letters of credit include remaining commitments of $684 million expiring in 2016 and $195 million expiring thereafter through 2027 . The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. We generally hold marketable securities and cash equivalents as collateral when necessary. At December 31, 2015 , the Company recorded $5.3 million as a liability for these guarantees, which consisted of $2.2 million attributable to the RULC and $3.1 million of deferred commitment fees. Certain mortgage loans sold have limited recourse provisions for periods ranging from three months to one year. The amount of losses resulting from the exercise of these provisions has not been significant. At December 31, 2015 , we had unfunded commitments for PEIs of approximately $22 million . These obligations have no stated maturity. Approximately $7 million of the PEIs related to these commitments are prohibited by the VR. See related discussions about these investments in Notes 5 and 20. The contractual or notional amount of financial instruments indicates a level of activity associated with a particular financial instrument class and is not a reflection of the actual level of risk. As of December 31, 2015 and 2014 , the regulatory risk-weighted values assigned to all off-balance sheet financial instruments and derivative instruments described herein were $6.3 billion and $5.9 billion , respectively. At December 31, 2015 , we were required to maintain cash balances of $295.2 million with the Federal Reserve Banks to meet minimum balance requirements in accordance with Federal Reserve Board (“FRB”) regulations. As of December 31, 2015 , the Parent has guaranteed approximately $165 million of debt of affiliated trusts issuing trust preferred securities, as discussed in Note 12. Leases We have commitments for leasing premises and equipment under the terms of noncancelable capital and operating leases expiring from 2016 and 2052 . Premises leased under capital leases at December 31, 2015 , were $1.2 million and accumulated amortization was $0.9 million . Amortization applicable to premises leased under capital leases is included in depreciation expense. Future aggregate minimum rental payments under existing noncancelable operating leases at December 31, 2015 , are as follows: (in thousands) 2016 $ 44,668 2017 43,730 2018 39,158 2019 32,524 2020 27,258 Thereafter 102,313 $ 289,651 Future aggregate minimum rental payments have been reduced by noncancelable subleases as follows: $1.5 million in 2016 , $1.7 million in 2017 , $1.6 million in 2018 , $1.5 million in 2019 , $0.6 million in 2020 , and $2.7 million thereafter. Aggregate rental expense on operating leases amounted to $62.5 million in 2015 , $59.2 million in 2014 , and $58.4 million in 2013 . Legal Matters We are subject to litigation in court and arbitral proceedings, as well as proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies. Litigation may relate to lending, deposit and other customer relationships, vendor and contractual issues, employee matters, intellectual property matters, personal injuries and torts, regulatory and legal compliance, and other matters. While most matters relate to individual claims, we are also subject to putative class action claims and similar broader claims. Proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies may relate to our banking, investment advisory, trust, securities, and other products and services; our customers’ involvement in money laundering, fraud, securities violations and other illicit activities or our policies and practices relating to such customer activities; and our compliance with the broad range of banking, securities and other laws and regulations applicable to us. At any given time, we may be in the process of responding to subpoenas, requests for documents, data and testimony relating to such matters and engaging in discussions to resolve the matters. As of December 31, 2015 , we were subject to the following material litigation and governmental inquiries: • a class action case, Reyes v. Zions First National Bank, et. al., which was brought in the United States District Court for the Eastern District of Pennsylvania in early 2010. This case relates to our banking relationships with customers that allegedly engaged in wrongful telemarketing practices. The plaintiff is seeking a trebled monetary award under the federal RICO Act. In the third quarter of 2013, the District Court denied the plaintiff’s motion for class certification in the Reyes case. The plaintiff appealed the District Court decision to the Third Circuit Court of Appeals. In the third quarter of 2015, the Third Circuit vacated the District Court’s decision denying class certification and remanded the matter to the District Court with instructions to reconsider the class certification determination in light of particular standards articulated by the Third Circuit in its opinion. Following the Third Circuit’s decision, the parties participated in mediation sessions in the fourth quarter of 2015 and the first quarter of 2016. We do not know whether these discussions will result in a settlement. • a governmental inquiry into possible money laundering activities of one of our bank customers and our anti-money laundering practices relating to that customer (conducted by the United States Attorney’s Office for the Southern District of New York). Our first contact with the United States Attorney’s Office relating to this matter occurred in early 2012. We are unclear about the status of this inquiry. • a governmental inquiry into our payment processing practices relating primarily to certain allegedly fraudulent telemarketers and other customer types (conducted by the Department of Justice). Similar inquiries directed towards banks unrelated to us have resulted in a number of enforcement actions. Our first contact with the Department of Justice relating to this matter occurred in early 2013. It appears that the Department of Justice’s inquiry into our practice is continuing. • a civil suit, Liu Aifang, et al. v. Velocity VIII, et al. , brought against us in the United States District Court for the Central District of California in April 2015. The case relates to our banking relationships with customers who were approved promoters of an EB-5 Visa Immigrant Investment Program that allegedly misappropriated investors’ funds. On September 30, 2015, the Court granted in part and denied in part our Motion to Dismiss Plaintiffs’ claims. The Plaintiffs’ remaining claims assert negligence and that the bank aided and abetted the promoter customers’ conversion of the investors’ funds deposited with us. Discovery is ongoing and trial is scheduled for June 2016. At least quarterly, we review outstanding and new legal matters, utilizing then available information. In accordance with applicable accounting guidance, if we determine that a loss from a matter is probable and the amount of the loss can be reasonably estimated, we establish an accrual for the loss. In the absence of such a determination, no accrual is made. Once established, accruals are adjusted to reflect developments relating to the matters. In our review, we also assess whether we can determine the range of reasonably possible losses for significant matters in which we are unable to determine that the likelihood of a loss is remote. Because of the difficulty of predicting the outcome of legal matters, discussed subsequently, we are able to meaningfully estimate such a range only for a limited number of matters. Based on information available as of December 31, 2015 , we estimated that the aggregate range of reasonably possible losses for those matters to be from $0 million to roughly $60 million in excess of amounts accrued. The matters underlying the estimated range will change from time to time, and actual results may vary significantly from this estimate. Those matters for which a meaningful estimate is not possible are not included within this estimated range and, therefore, this estimated range does not represent our maximum loss exposure. Based on our current knowledge, we believe that our current estimated liability for litigation and other legal actions and claims, reflected in our accruals and determined in accordance with applicable accounting guidance, is adequate and that liabilities in excess of the amounts currently accrued, if any, arising from litigation and other legal actions and claims for which an estimate as previously described is possible, will not have a material impact on our financial condition, results of operations, or cash flows. However, in light of the significant uncertainties involved in these matters, and the very large or indeterminate damages sought in some of these matters, an adverse outcome in one or more of these matters could be material to our financial condition, results of operations, or cash flows for any given reporting period. Any estimate or determination relating to the future resolution of litigation, arbitration, governmental or self-regulatory examinations, investigations or actions or similar matters is inherently uncertain and involves significant judgment. This is particularly true in the early stages of a legal matter, when legal issues and facts have not been well articulated, reviewed, analyzed, and vetted through discovery, preparation for trial or hearings, substantive and productive mediation or settlement discussions, or other actions. It is also particularly true with respect to class action and similar claims involving multiple defendants, matters with complex procedural requirements or substantive issues or novel legal theories, and examinations, investigations and other actions conducted or brought by governmental and self-regulatory agencies, in which the normal adjudicative process is not applicable. Accordingly, we usually are unable to determine whether a favorable or unfavorable outcome is remote, reasonably likely, or probable, or to estimate the amount or range of a probable or reasonably likely loss, until relatively late in the course of a legal matter, sometimes not until a number of years have elapsed. Accordingly, our judgments and estimates relating to claims will change from time to time in light of developments and actual outcomes will differ from our estimates. These differences may be material. Related Party Transactions We have no material related party transactions requiring disclosure. In the ordinary course of business, the Company and its subsidiary bank extend credit to related parties, including executive officers, directors, principal shareholders, and their associates and related interests. These related party loans are made in compliance with applicable banking regulations.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2015
Regulatory Capital Requirements [Abstract]
Regulatory Matters	18. REGULATORY MATTERS We are subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory – and possibly additional discretionary – actions by regulators that, if undertaken, could have a direct material effect on our financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, we must meet specific capital guidelines that involve quantitative measures of our assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. Required capital levels are also subject to judgmental review by regulators. The Basel III capital rules, which effectively replaced the Basel I rules, became effective for the Company on January 1, 2015 (subject to phase-in periods for certain of their components). In 2013, the FRB, FDIC, and OCC published final rules (the “Basel III Capital Rules”) establishing a new comprehensive capital framework for U.S. banking organizations. The rules implement the Basel Committee’s December 2010 framework, commonly referred to as Basel III, for strengthening international capital standards as well as certain provisions of the Dodd-Frank Act. The Basel III capital rules substantially revised the risk-based capital requirements applicable to bank holding companies and depository institutions, including the Company, compared to the Basel I U.S. risk-based capital rules. Under prior Basel I capital standards, the effects of AOCI items included in capital were excluded for purposes of determining regulatory capital and capital ratios. As a “non-advanced approaches banking organization,” we made a one-time permanent election as of January 1, 2015 to continue to exclude these items, as allowed under the Basel III Capital Rules. Quantitative measures established by regulation to ensure capital adequacy require us to maintain minimum amounts and ratios (set forth in the following schedule) of Total and Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier 1 capital (as defined) to average assets (as defined). As of December 31, 2015 , all capital ratios of the Company and its subsidiary bank exceeded the “well-capitalized” levels under the regulatory framework for prompt corrective action. Dividends declared by our subsidiary bank in any calendar year may not, without the approval of the appropriate federal regulators, exceed specified criteria. Appropriate capital levels and distributions of capital to shareholders for the Company and other “systemically important financial institutions” (“SIFIs”) are also subject to annual “stress tests” performed as a part of the Federal Reserve’s CCAR process. The stress tests seek to comprehensively measure all risks to which the institution is exposed, including credit, liquidity, market, operating and other risks, the losses that could result from those risk exposures under adverse scenarios, and the institution’s resulting capital levels. These stress tests have both a qualitative and a quantitative component. The qualitative component evaluates the robustness of the Company’s risk identification, stress risk modeling, policies, capital planning, governance processes, and other components of a Capital Adequacy Process. The quantitative process subjects the Company’s balance sheet and other risk characteristics to stress testing and independent determination by the Federal Reserve using its own models. Most capital actions, including for example, payment of dividends and repurchasing stock, are subject to non-objection by the Federal Reserve to a capital plan based on both the qualitative and quantitative assessments of the plan. Because the Company’s subsidiary bank has assets greater than $10 billion also it is subject to annual stress testing and capital planning processes examined by the Office of the Comptroller of the Currency (“OCC”), known as the Dodd-Frank Act Stress Test (“DFAST”). The actual capital amounts and ratios for the Company and its subsidiary bank under Basel III are as follows: December 31, 2015 To be well-capitalized (Amounts in thousands) Amount Ratio Amount Ratio Transitional Basis Basel III Regulatory Capital Rules Total capital (to risk-weighted assets) The Company $ 7,535,760 16.12 % $ 4,674,725 10.00 % ZB, National Association 6,918,312 14.84 4,661,581 10.00 Tier 1 capital (to risk-weighted assets) The Company 6,580,326 14.08 3,739,780 8.00 ZB, National Association 6,334,391 13.59 3,729,265 8.00 Common equity tier 1 capital (Basel III) The Company 5,711,836 12.22 3,038,571 6.50 ZB, National Association 5,503,491 11.81 3,030,028 6.50 Tier 1 capital (to average assets) The Company 6,580,326 11.26 na na 1 ZB, National Association 6,334,391 10.97 2,886,732 5.00 1 There is no Tier 1 leverage ratio component in the definition of a well-capitalized bank holding company . The actual capital amounts and ratios for the Company and its three largest subsidiary banks prior to the charter consolidation under Basel I are as follows: December 31, 2014 To be well-capitalized (Amounts in thousands) Amount Ratio Amount Ratio Basel I Regulatory Capital Rule Total capital (to risk-weighted assets) The Company $ 7,443,301 16.27 % $ 4,573,768 10.00 % Zions Bank 2,108,904 15.27 1,381,243 10.00 California Bank & Trust 1,286,095 14.18 906,915 10.00 Amegy Bank 1,741,586 14.09 1,236,244 10.00 Tier 1 capital (to risk-weighted assets) The Company 6,620,282 14.47 2,744,261 6.00 Zions Bank 1,942,856 14.07 828,746 6.00 California Bank & Trust 1,179,129 13.00 544,149 6.00 Amegy Bank 1,586,686 12.83 741,747 6.00 Tier 1 capital (to average assets) The Company 6,620,282 11.82 na na 1 Zions Bank 1,942,856 10.52 923,193 5.00 California Bank & Trust 1,179,129 10.78 547,086 5.00 Amegy Bank 1,586,686 11.79 672,996 5.00 1 There is no Tier 1 leverage ratio component in the definition of a well-capitalized bank holding company . Zions is also subject to “capital conservation buffer” regulatory requirements. When fully phased-in on January 1, 2019, the Basel III Capital Rules will require the Company and its subsidiary bank to maintain a 2.5% capital conservation buffer, designed to absorb losses during periods of economic stress, composed entirely of CET1, on top of the minimum risk-weighted asset ratios, effectively resulting in minimum ratios of (i) CET1 to risk-weighted assets of at least 7%, (ii) Tier 1 capital to risk-weighted assets of at least 8.5%, and (iii) Total capital to risk-weighted assets of at least 10.5%. Banking institutions with a ratio of CET1 to risk-weighted assets above the minimum but below the capital conservation buffer will face constraints on dividends, equity repurchases, and compensation. The implementation of the buffer will be phased-in beginning January 1, 2016 at the 0.625% level and increase by 0.625% on each subsequent January 1, until it reaches 2.5% on January 1, 2019. Zions’ triggers and limits under actual conditions and baseline projections are more restrictive than the capital conservation buffer requirements.

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Retirement Plans	RETIREMENT PLANS Defined Benefit Plans Pension – This qualified noncontributory defined benefit plan has been frozen to new participation. No service-related benefits accrued for existing participants except for those with certain grandfathering provisions. Effective July 1, 2013, the plan was amended to remove the exception for grandfathered participants. The effect of this change was not significant to the plan. All participants in the Plan are currently 100% vested in their benefits. Plan assets consist principally of corporate equity securities, mutual fund investments, real estate, and fixed income investments. Plan benefits are paid as a lump-sum cash value or an annuity at retirement age. Contributions to the plan are based on actuarial recommendation and pension regulations. Currently, it is expected that no minimum regulatory contributions will be required in 2016. Supplemental Retirement – These unfunded nonqualified plans are for certain current and former employees. Each year, Company contributions to these plans are made in amounts sufficient to meet benefit payments to plan participants. Postretirement Medical/Life – This unfunded health care and life insurance plan provides postretirement medical benefits to certain full-time employees who meet minimum age and service requirements. The plan also provides specified life insurance benefits to certain employees. The plan is contributory with retiree contributions adjusted annually, and contains other cost-sharing features such as deductibles and coinsurance. Plan coverage is provided by self-funding or health maintenance organization options. Our contribution towards the retiree medical premium has been permanently frozen at an amount that does not increase in any future year. Retirees pay the difference between the full premium rates and our capped contribution. Because our contribution rate is capped, there is no effect on the postretirement plan from assumed increases or decreases in health care cost trends. Each year, Company contributions to the plan are made in amounts sufficient to meet the portion of the premiums that are the Company’s responsibility. The following presents the change in benefit obligation, change in fair value of plan assets, and funded status, of the plans and amounts recognized in the balance sheet as of the measurement date of December 31: (In thousands) Pension Supplemental Retirement Postretirement 2015 2014 2015 2014 2015 2014 Change in benefit obligation: Benefit obligation at beginning of year $ 185,944 $ 169,092 $ 10,595 $ 10,276 $ 1,067 $ 1,062 Service cost — — — — 33 31 Interest cost 7,094 7,468 403 454 40 47 Actuarial (gain) loss (8,085 ) 20,859 (226 ) 738 (121 ) 19 Benefits paid (11,745 ) (11,475 ) (778 ) (873 ) (65 ) (92 ) Benefit obligation at end of year 173,208 185,944 9,994 10,595 954 1,067 Change in fair value of plan assets: Fair value of plan assets at beginning of year 170,199 171,905 — — — — Actual return on plan assets (1,136 ) 9,769 — — — — Employer contributions — — 778 873 65 92 Benefits paid (11,745 ) (11,475 ) (778 ) (873 ) (65 ) (92 ) Fair value of plan assets at end of year 157,318 170,199 — — — — Funded status $ (15,890 ) $ (15,745 ) $ (9,994 ) $ (10,595 ) $ (954 ) $ (1,067 ) Amounts recognized in balance sheet: Liability for pension/postretirement benefits $ (15,890 ) $ (15,745 ) $ (9,994 ) $ (10,595 ) $ (954 ) $ (1,067 ) Accumulated other comprehensive income (loss) (60,067 ) (60,581 ) (2,288 ) (2,637 ) (332 ) 264 Accumulated other comprehensive income (loss) consists of: Net gain (loss) $ (60,067 ) $ (60,581 ) $ (2,288 ) $ (2,637 ) $ (332 ) $ 264 For 2015 , the pension plan benefit obligation at end of year decreased due to the updated mortality table issued by the Society of Actuaries that reflects increased life expectancy assumptions, and an increase in the year-end discount rate. The liability for pension/postretirement benefits is included in other liabilities in the balance sheet. The accumulated benefit obligation is the same as the benefit obligation shown in the preceding schedule. The amounts in AOCI (loss) at December 31, 2015 expected to be recognized as an expense component of net periodic benefit cost in 2016 for the plans are estimated as follows: (In thousands) Pension Supplemental Retirement Postretirement Net gain (loss) $ (6,638 ) $ (117 ) $ 66 The following presents the components of net periodic benefit cost (credit) for the plans: Pension Supplemental Retirement Postretirement (In thousands) 2015 2014 2013 2015 2014 2013 2015 2014 2013 Service cost $ — $ — $ — $ — $ — $ — $ 33 $ 31 $ 32 Interest cost 7,094 7,468 6,885 403 454 404 40 47 41 Expected return on plan assets (12,360 ) (13,305 ) (12,109 ) Amortization of net actuarial (gain) loss 5,926 2,895 8,132 123 19 70 (53 ) (71 ) (75 ) Amortization of prior service (credit) cost — 50 124 — — (151 ) Settlement loss — — 1,814 — — — Net periodic benefit cost (credit) $ 660 $ (2,942 ) $ 4,722 $ 526 $ 523 $ 598 $ 20 $ 7 $ (153 ) Weighted average assumptions based on the pension plan are the same where applicable for each of the plans and are as follows: 2015 2014 2013 Used to determine benefit obligation at year-end: Discount rate 4.20 % 3.95 % 4.60 % Rate of compensation increase 1 na na na Used to determine net periodic benefit cost for the years ended December 31: Discount rate 3.95 4.60 3.75 Expected long-term return on plan assets 7.50 8.00 8.00 Rate of compensation increase 1 na na 3.50 1 As previously discussed, the pension plan became fully frozen effective July 1, 2013 by a plan amendment that eliminated the remaining grandfather provisions. This action eliminated the need to continue using the rate of compensation increase assumption as of December 31, 2013. The discount rate reflects the yields available on long-term, high-quality fixed income debt instruments with cash flows similar to the obligations of the pension plan, and is reset annually on the measurement date. The expected long-term rate of return on plan assets is based on a review of the target asset allocation of the plan. This rate is intended to approximate the long-term rate of return that we anticipate receiving on the plan’s investments, considering the mix of the assets that the plan holds as investments, the expected return on these underlying investments, the diversification of these investments, and the rebalancing strategies employed. An expected long-term rate of return is assumed for each asset class and an underlying inflation rate assumption is determined. Benefit payments to the plans’ participants are estimated as follows for the years succeeding December 31, 2015 : (In thousands) Pension Supplemental Retirement Postretirement 2016 $ 9,876 $ 1,870 $ 80 2017 10,307 845 93 2018 10,373 838 98 2019 10,253 871 98 2020 10,702 819 102 Years 2021 - 2025 53,028 3,459 445 We are also obligated under other supplemental retirement plans for certain current and former employees. Our liability for these plans was $6.9 million and $6.3 million at December 31, 2015 and 2014 , respectively. For the pension plan, the investment strategy is predicated on its investment objectives and the risk and return expectations of asset classes appropriate for the plan. Investment objectives have been established by considering the plan’s liquidity needs and time horizon and the fiduciary standards under the Employee Retirement Income Security Act of 1974. The asset allocation strategy is developed to meet the plan’s long-term needs in a manner designed to control volatility and to reflect risk tolerance. Target investment allocation percentages as of December 31, 2015 are 65% in equity, 30% in fixed income and cash, and 5% in real estate assets. The following presents the fair values of pension plan investments according to the fair value hierarchy described in Note 20, and the weighted average allocations: (Amounts in thousands) December 31, 2015 December 31, 2014 Level 1 Level 2 Level 3 Total % Level 1 Level 2 Level 3 Total % Company common stock $ 6,482 $ 6,482 4 $ 7,560 $ 7,560 4 Mutual funds: Debt 5,250 5,250 4 6,047 6,047 4 Insurance company pooled separate accounts: Equity investments $ 88,355 88,355 56 $ 97,094 97,094 57 Debt investments 31,659 31,659 20 33,167 33,167 19 Real estate 9,909 9,909 6 8,611 8,611 5 Guaranteed deposit account $ 9,484 9,484 6 $ 11,515 11,515 7 Limited partnerships 6,179 6,179 4 6,205 6,205 4 $ 11,732 $ 129,923 $ 15,663 $ 157,318 100 $ 13,607 $ 138,872 $ 17,720 $ 170,199 100 No transfers of assets occurred among Levels 1, 2 or 3 during 2015 or 2014 . The following describes the pension plan investments and the valuation methodologies used to measure their fair value: Company common stock – Shares of the Company’s common stock are valued at the last reported sales price on the last business day of the plan year in the active market where individual securities are traded. Mutual funds – These funds are valued at quoted market prices which represent the NAVs of shares held by the plan at year-end. Insurance company pooled separate accounts – These funds are invested in by more than one investor. They are offered through separate accounts of the trustee’s insurance company and managed by internal and professional advisors. Participation units in these accounts are valued at the NAV as the practical expedient for fair value as determined by the insurance company. Guaranteed deposit account – This account is a group annuity product issued by the trustee’s insurance company with guaranteed crediting rates established at the beginning of each calendar year. The account balance is stated at fair value as estimated by the trustee. The account is credited with deposits made, plus earnings at guaranteed crediting rates, less withdrawals and administrative expenses. The underlying investments generally include investment-grade public and privately traded debt securities, mortgage loans and, to a lesser extent, real estate and other equity investments. Market value adjustments are applied at the time of redemption if certain withdrawal limits are exceeded. Additional fair value quantitative information for the guaranteed deposit account is a follows: Principal valuation techniques Significant unobservable inputs Range (weighted average) of significant input values For the underlying investments – reported fair values when available for market traded investments; when not applicable, discounted cash flows under an income approach using U.S. Treasury rates and spreads based on cash flow timing and quality of assets. Earnings at guaranteed crediting rate Gross guaranteed crediting rate must be greater than or equal to contractual minimum crediting rate Composite market value factor At December 31, 2015 0.995927 - 1.049539 (actual = 1.042254) 2014 1.018148 - 1.081039 (actual = 1.063133) The Company’s Benefits Committee evaluates the methodology and factors used, including review of the contract, economic conditions, industry and market developments, and overall credit ratings of the underlying investments. Limited partnerships – These partnerships invest in limited partnerships, limited liability companies, or similar investment vehicles that consist of PEIs in a wide variety of investment types, including venture and growth capital, real estate, energy and natural resources, and other private investments. The plan’s investments are valued by the limited partnerships at NAV as the practical expedient for fair value. The estimation process takes into account the plan’s proportional interests credited with realized and unrealized earnings from the underlying investments and charged for operating expenses and distributions. Investments are increased by capital calls and are part of an overall capital commitment by the plan of up to approximately $8.75 million at December 31, 2015 . The following presents additional information as of December 31, 2015 and 2014 for the pooled separate accounts and limited partnerships whose fair values under Levels 2 and 3 are based on NAV per share: Investment Unfunded commitments (in thousands, approximately) Redemption Frequency Notice period Pooled separate accounts na Daily < $1 million, 1 day >= $1 million, 3 days Limited partnerships $ 1,600 Investments in these limited partnerships are illiquid and voluntary withdrawal is prohibited. The following reconciles the beginning and ending balances of assets measured at fair value on a recurring basis using Level 3 inputs: Level 3 Instruments Year Ended December 31, 2015 2014 (In thousands) Guaranteed deposit account Limited partnerships Guaranteed deposit account Limited partnerships Balance at beginning of year $ 11,515 $ 6,205 $ 12,582 $ 5,292 Net increases (decreases) included in plan statement of change in net assets available for benefits: Net operating fees and expenses (376 ) (88 ) (267 ) (93 ) Net appreciation (depreciation) in fair value of investments: Realized — 539 — 211 Unrealized (628 ) 157 375 925 Interest and dividends 284 — 359 — Purchases 10,428 1,110 9,995 1,014 Sales (11,739 ) — (11,529 ) — Settlements — (1,744 ) — (1,144 ) Balance at end of year $ 9,484 $ 6,179 $ 11,515 $ 6,205 Shares of Company common stock were 233,849 and 262,209 at December 31, 2015 and 2014 , respectively. Dividends received by the plan were approximately $56 thousand in 2015 and $43 thousand in 2014 . Defined Contribution Plan The Company offers a 401(k) and employee stock ownership plan under which employees select from several investment alternatives. Employees can contribute up to 80% of their earnings subject to the annual maximum allowed contribution. The Company matches 100% of the first 3% of employee contributions and 50% of the next 2% of employee contributions. Matching contributions to participants, which were shares of the Company’s common stock purchased in the open market, amounted to $25.5 million in 2015 , $24.3 million in 2014 , and $22.7 million in 2013 . The 401(k) plan also has a noncontributory profit sharing feature which is discretionary and may range from 0% to 6% of eligible compensation based upon the Company’s return on average common equity for the year. The profit sharing expense was computed at a contribution rate of 1% for 2015 and 2% for 2014 and 2013 , and amounted to $6.1 million for 2015 , $12.0 million for 2014 and $11.8 million for 2013 . The profit sharing contribution to participants consisted of shares of the Company’s common stock purchased in the open market.

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Measurement Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. To measure fair value, a hierarchy has been established that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs. This hierarchy uses three levels of inputs to measure the fair value of assets and liabilities as follows: Level 1 – Quoted prices in active markets for identical assets or liabilities in active markets that the Company has the ability to access; Level 2 – Observable inputs other than Level 1 including quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in less active markets, observable inputs other than quoted prices that are used in the valuation of an asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means; and Level 3 – Unobservable inputs supported by little or no market activity for financial instruments whose value is determined by pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. The level in the fair value hierarchy within which the fair value measurement is classified is determined based on the lowest level input that is significant to the fair value measure in its entirety. Market activity is presumed to be orderly in the absence of evidence of forced or disorderly sales, although such sales may still be indicative of fair value. Applicable accounting guidance precludes the use of blockage factors or liquidity adjustments due to the quantity of securities held by an entity. We use fair value to measure certain assets and liabilities on a recurring basis when fair value is the primary measure for accounting. Fair value is used on a nonrecurring basis to measure certain assets when adjusting carrying values, such as the application of lower of cost or fair value accounting, including recognition of impairment on assets. Fair value is also used when providing required disclosures for certain financial instruments. Fair Value Policies and Procedures We have various policies, processes and controls in place to ensure that fair values are reasonably developed, reviewed and approved for use. These include a Securities Valuation Committee (“SVC”) comprised of executive management appointed by the Board of Directors. The SVC reviews and approves on a quarterly basis the key components of fair value estimation, including critical valuation assumptions for Level 3 modeling. A Model Risk Management Group conducts model validations, including internal models, and sets policies and procedures for revalidation, including the timing of revalidation. Third Party Service Providers We use a third party pricing service to fair value measurements for approximately 92% of our AFS Level 2 securities. Fair value measurements for other AFS Level 2 generally use certain inputs corroborated by market data and include standard form discounted cash flow modeling. For Level 2 securities, the third party pricing service provides documentation on an ongoing basis that presents market corroborative data, including detail pricing information and market reference data. The documentation includes benchmark yields, reported trades, broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data, including information from the vendor trading platform. We review, test and validate this information as appropriate. Absent observable trade data, we do not adjust prices from our third party sources. The following describes the hierarchy designations, valuation methodologies, and key inputs to measure fair value on a recurring basis for designated financial instruments: Available-for-Sale U.S. Treasury, Agencies and Corporations U.S. Treasury securities are measured under Level 1 using quoted market prices when available. U.S. agencies and corporations are measured under Level 2 generally using the previously discussed third party pricing service. Municipal Securities Municipal securities are measured under Level 2 generally using the third party pricing service or an internal model. Valuation inputs include Baa municipal curves, as well as FHLB and London Interbank Offered Rate (“LIBOR”) swap curves. Our valuation methodology for non-rated municipal securities changed at year end to utilize more observable inputs, primarily municipal market yield curves, and fewer unobservable inputs as compared to our previous valuation method. The resulting values were determined to be Level 2. Money Market Mutual Funds and Other Money market mutual funds and other securities are measured under Level 1 or Level 2. For Level 1, quoted market prices are used which may include NAVs or their equivalents. Level 2 valuations generally use quoted prices for similar securities. Trading Account Securities in the trading account are generally measured under Level 2 using third party pricing service providers as described previously. Bank-Owned Life Insurance Bank-owned life insurance (“BOLI”) is measured under Level 2 according to cash surrender values (“CSVs”) of the insurance policies that are provided by a third party service. Nearly all policies are general account policies with CSVs based on the Company’s claims on the assets of the insurance companies. The insurance companies’ investments include predominantly fixed income securities consisting of investment-grade corporate bonds and various types of mortgage instruments. Management regularly reviews its BOLI investment performance, including concentrations among insurance providers. Private Equity Investments Private equity investments are measured under Level 3. The Equity Investments Committee, consisting of executives familiar with the investments, reviews periodic financial information, including audited financial statements when available. Certain analytics may be employed that include current and projected financial performance, recent financing activities, economic and market conditions, market comparables, market liquidity, sales restrictions, and other factors. The amount of unfunded commitments to invest is disclosed in Note 17. Certain restrictions apply for the redemption of these investments and certain investments are prohibited by the VR. See discussions in Notes 5 and 17. Agriculture Loan Servicing This asset results from our servicing of agriculture loans approved and funded by FAMC. We provide this servicing under an agreement with FAMC for loans they own. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies. Interest-Only Strips Interest-only strips are created as a by-product of the securitization process. When the guaranteed portions of SBA 7(a) loans are pooled, interest-only strips may be created in the pooling process. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies. Deferred Compensation Plan Assets and Obligations Invested assets in the deferred compensation plan consist of shares of registered investment companies. These mutual funds are valued under Level 1 at quoted market prices, which represents the NAV of shares held by the plan at the end of the period. Derivatives Derivatives are measured according to their classification as either exchange-traded or over-the-counter (“OTC”). Exchange-traded derivatives consist of foreign currency exchange contracts measured under Level 1 because they are traded in active markets. OTC derivatives, including those for customers, consist of interest rate swaps and options. These derivatives are measured under Level 2 using third party services. Observable market inputs include yield curves (the LIBOR swap curve and relevant overnight index swap curves), foreign exchange rates, commodity prices, option volatilities, counterparty credit risk, and other related data. Credit valuation adjustments are required to reflect nonperformance risk for both the Company and the respective counterparty. These adjustments are determined generally by applying a credit spread to the total expected exposure of the derivative. Securities Sold, Not Yet Purchased Securities sold, not yet purchased, included in “Federal funds and other short-term borrowings” on the balance sheet, are measured under Level 1 using quoted market prices. If not available, quoted prices under Level 2 for similar securities are used. Quantitative Disclosure by Fair Value Hierarchy Assets and liabilities measured at fair value by class on a recurring basis are summarized as follows: (In thousands) December 31, 2015 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: U.S. Treasury, agencies and corporations $ — $ 7,100,844 $ — $ 7,100,844 Municipal securities 418,695 418,695 Other debt securities 22,941 22,941 Money market mutual funds and other 61,807 38,829 100,636 61,807 7,581,309 — 7,643,116 Trading account 48,168 48,168 Other noninterest-bearing investments: Bank-owned life insurance 485,978 485,978 Private equity investments 120,027 120,027 Other assets: Agriculture loan servicing and interest-only strips 13,514 13,514 Deferred compensation plan assets 84,570 84,570 Derivatives: Interest rate related and other 5,966 5,966 Interest rate swaps for customers 51,353 51,353 Foreign currency exchange contracts 20,824 20,824 20,824 57,319 78,143 $ 167,201 $ 8,172,774 $ 133,541 $ 8,473,516 LIABILITIES Securities sold, not yet purchased $ 30,158 $ — $ — $ 30,158 Other liabilities: Deferred compensation plan obligations 84,570 84,570 Derivatives: Interest rate related and other 835 835 Interest rate swaps for customers 53,843 53,843 Foreign currency exchange contracts 17,761 17,761 17,761 54,678 — 72,439 Other — $ 132,489 $ 54,678 $ — $ 187,167 (In thousands) December 31, 2014 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: U.S. Treasury, agencies and corporations $ — $ 3,098,208 $ — $ 3,098,208 Municipal securities 185,093 4,164 189,257 Asset-backed securities: Trust preferred – banks and insurance 22,701 393,007 415,708 Auction rate 4,761 4,761 Other 666 25 691 Money market mutual funds and other 105,348 30,275 135,623 105,348 3,336,943 401,957 3,844,248 Trading account 70,601 70,601 Other noninterest-bearing investments: Bank-owned life insurance 476,290 476,290 Private equity investments 97,649 97,649 Other assets: Agriculture loan servicing and interest-only strips 12,227 12,227 Deferred compensation plan assets 88,878 88,878 Derivatives: Interest rate related and other 1,508 1,508 Interest rate swaps for customers 48,287 48,287 Foreign currency exchange contracts 16,625 16,625 16,625 49,795 66,420 $ 210,851 $ 3,933,629 $ 511,833 $ 4,656,313 LIABILITIES Securities sold, not yet purchased $ 24,230 $ — $ — $ 24,230 Other liabilities: Deferred compensation plan obligations 88,878 88,878 Derivatives: Interest rate related and other 297 297 Interest rate swaps for customers 50,669 50,669 Foreign currency exchange contracts 15,272 15,272 15,272 50,966 — 66,238 Other 13 13 $ 128,380 $ 50,966 $ 13 $ 179,359 Reconciliation of Level 3 Fair Value Measurements The following reconciles the beginning and ending balances of assets and liabilities that are measured at fair value by class on a recurring basis using Level 3 inputs: Level 3 Instruments Year Ended December 31, 2015 (In thousands) Municipal Trust Other Private Ag loan svcg and int-only strips Derivatives Balance at December 31, 2014 $ 4,164 $ 393,007 $ 4,761 $ 97,649 $ 12,227 $ (12 ) Total net gains (losses) included in: Statement of income: Accretion of purchase discount on securities available-for-sale 3 471 Dividends and other investment loss (3,657 ) Equity securities gains, net 7,270 Fixed income securities losses, net (344 ) (136,691 ) (606 ) Other noninterest income 1,480 Other noninterest expense 12 Other comprehensive income (loss) 687 141,547 (74 ) Fair Value of HTM securities reclassified as AFS 57,308 Purchases 24,898 993 Sales (2,651 ) (440,055 ) (4,081 ) (4,107 ) Redemptions and paydowns (1,859 ) (15,587 ) (2,026 ) (1,186 ) Balance at December 31, 2015 $ — $ — $ — $ 120,027 $ 13,514 $ — Level 3 Instruments Year Ended December 31, 2014 (In thousands) Municipal Trust Trust 1 Auction Other Private Ag loan svcg and int-only strips Derivatives Balance at December 31, 2013 $ 10,662 $ 1,238,820 $ 22,996 $ 6,599 $ 25,800 $ 82,410 $ 8,852 $ (4,303 ) Total net gains (losses) included in: Statement of income: Accretion of purchase discount on securities available-for-sale 32 2,151 3 Dividends and other investment income 3,976 Fair value and nonhedge derivative loss (7,894 ) Equity securities gains, net 5,869 Fixed income securities gains (losses), net 126 (3,097 ) 1,399 50 10,917 Other noninterest income 857 Other noninterest expense 228 Other comprehensive income (loss) (376 ) 146,303 (19 ) (15 ) Purchases 21,768 3,351 Sales (5,679 ) (818,647 ) (24,395 ) (922 ) (36,670 ) (10,448 ) Redemptions and paydowns (601 ) (103,330 ) (950 ) (7 ) (5,926 ) (833 ) 11,956 Transfers to Level 2 (69,193 ) Balance at December 31, 2014 $ 4,164 $ 393,007 $ — $ 4,761 $ 25 $ 97,649 $ 12,227 $ (13 ) 1 Real Estate Investment Trust Except for the transfers included in the previous schedule, no transfers of assets or liabilities occurred among Levels 1, 2 or 3 for 2015 and 2014 . Transfers are considered to have occurred as of the end of the reporting period. The preceding reconciling amounts using Level 3 inputs include the following realized gains/losses in the statement of income: (In thousands) Year Ended December 31, 2015 2014 Dividends and other investment income (loss) $ (2 ) $ 518 Equity securities losses, net (11,311 ) — Fixed income securities gains (losses), net (137,641 ) 9,395 Nonrecurring Fair Value Measurements Included in the balance sheet amounts are the following amounts of assets that had fair value changes measured on a nonrecurring basis: (In thousands) Fair value at December 31, 2015 Gains (losses) from fair value changes Year Ended December 31, 2015 Level 1 Level 2 Level 3 Total ASSETS Private equity investments, carried at cost $ — $ — $ 10,707 $ 10,707 $ (5,119 ) Impaired loans — 10,991 — 10,991 (12,039 ) Other real estate owned — 2,388 — 2,388 (2,467 ) $ — $ 13,379 $ 10,707 $ 24,086 $ (19,625 ) (In thousands) Fair value at December 31, 2014 Gains (losses) from fair value changes Year Ended December 31, 2014 Level 1 Level 2 Level 3 Total ASSETS Private equity investments, carried at cost $ — $ — $ 23,454 $ 23,454 $ (2,527 ) Impaired loans — 19,453 — 19,453 (9,776 ) Other real estate owned — 8,034 — 8,034 (6,784 ) $ — $ 27,487 $ 23,454 $ 50,941 $ (19,087 ) The previous fair values may not be current as of the dates indicated, but rather as of the date the fair value change occurred, such as a charge for impairment. Accordingly, carrying values may not equal current fair value. We recognized net gains of $4.0 million in 2015 and $8.8 million in 2014 from the sale of OREO properties that had a carrying value at the time of sale of approximately $19.2 million in 2015 and $41.4 million in 2014 . Previous to their sale in these years, we recognized impairment on these properties of $0.6 million in 2015 and $0.7 million in 2014 . Private equity investments carried at cost were measured at fair value for impairment purposes according to the methodology previously discussed for these investments. Amounts of PEIs carried at cost were $25.3 million and $39.1 million at December 31, 2015 and 2014 , respectively. Amounts of other noninterest-bearing investments carried at cost were $191.5 million and $224.4 million at December 31, 2015 and 2014 , respectively, which were comprised of Federal Reserve and FHLB stock. Impaired (or nonperforming) loans that are collateral-dependent were measured at fair value based on the fair value of the collateral. OREO was measured initially at fair value based on property appraisals at the time of transfer and subsequently at the lower of cost or fair value. Measurement of fair value for collateral-dependent loans and OREO was based on third party appraisals that utilize one or more valuation techniques (income, market and/or cost approaches). Any adjustments to calculated fair value were made based on recently completed and validated third party appraisals, third party appraisal services, automated valuation services, or our informed judgment. Evaluations were made to determine that the appraisal process met the relevant concepts and requirements of applicable accounting guidance. Automated valuation services may be used primarily for residential properties when values from any of the previous methods were not available within 90 days of the balance sheet date. These services use models based on market, economic, and demographic values. The use of these models has only occurred in a very few instances and the related property valuations have not been significant to consider disclosure under Level 3 rather than Level 2. Impaired loans that are not collateral-dependent were measured based on the present value of future cash flows discounted at the expected coupon rates over the lives of the loans. Because the loans were not discounted at market interest rates, the valuations do not represent fair value and have been excluded from the nonrecurring fair value balance in the preceding schedules. Fair Value of Certain Financial Instruments Following is a summary of the carrying values and estimated fair values of certain financial instruments: December 31, 2015 December 31, 2014 (Amounts in thousands) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 545,648 $ 552,088 2 $ 647,252 $ 677,196 3 Loans and leases (including loans held for sale), net of allowance 40,193,374 39,535,365 3 39,591,499 39,426,141 3 Financial liabilities: Time deposits 2,130,680 2,129,742 2 2,406,924 2,408,550 2 Foreign deposits 294,391 294,321 2 328,391 328,447 2 Long-term debt (less fair value hedges) 817,348 838,796 2 1,090,778 1,159,287 2 This summary excludes financial assets and liabilities for which carrying value approximates fair value and financial instruments that are recorded at fair value on a recurring basis. Financial instruments for which carrying values approximate fair value include cash and due from banks, money market investments, demand, savings and money market deposits, and federal funds purchased and security repurchase agreements. The estimated fair value of demand, savings and money market deposits is the amount payable on demand at the reporting date. Carrying value is used because the accounts have no stated maturity and the customer has the ability to withdraw funds immediately. HTM investment securities primarily consist of municipal securities. They were measured at fair value according to the methodology previously discussed. Loans are measured at fair value according to their status as nonimpaired or impaired. For nonimpaired loans, fair value is estimated by discounting future cash flows using the LIBOR yield curve adjusted by a factor which reflects the credit and interest rate risk inherent in the loan. These future cash flows are then reduced by the estimated “life-of-the-loan” aggregate credit losses in the loan portfolio. These adjustments for lifetime future credit losses are derived from the methods used to estimate the ALLL for our loan portfolio and are adjusted quarterly as necessary to reflect the most recent loss experience. Impaired loans that are collateral-dependent are already considered to be held at fair value. Impaired loans that are not collateral-dependent have future cash flows reduced by the estimated “life-of-the-loan” credit loss derived from methods used to estimate the ALLL for these loans. See Impaired Loans in Note 6 for details on the impairment measurement method for impaired loans. Loans, other than those held for sale, are not normally purchased and sold by the Company, and there are no active trading markets for most of this portfolio. At December 31, 2015, oil and gas-related loan fair value measurement incorporated an illiquidity risk premium in addition to credit and interest rate risk adjustments. Time and foreign deposits, and any other short-term borrowings, are measured at fair value by discounting future cash flows using the LIBOR yield curve to the given maturity dates. Long-term debt is measured at fair value based on actual market trades (i.e., an asset value) when available, or discounting cash flows to maturity using the LIBOR yield curve adjusted for credit spreads. These fair value disclosures represent our best estimates based on relevant market information and information about the financial instruments. Fair value estimates are based on judgments regarding current economic conditions, future expected loss experience, risk characteristics of the various instruments, and other factors. These estimates are subjective in nature, involve uncertainties and matters of significant judgment, and cannot be determined with precision. Changes in these methodologies and assumptions could significantly affect the estimates.

Operating Segment Information

Operating Segment Information	12 Months Ended
	Dec. 31, 2015
Operating Segment Information [Abstract]
Segment Reporting Disclosure [Text Block]	OPERATING SEGMENT INFORMATION We manage our operations and prepare management reports and other information with a primary focus on geographical area. As discussed in Note 1, following the close of business on December 31, 2015, the Company’s seven subsidiary banks and certain other subsidiaries were merged into a single entity, whose name was changed to ZB, N.A. Effective April 1, 2015, TCBO was merged into TCBW. These consolidations will affect the presentation of segment reporting, although certain geographical information will continue. Certain prior year amounts have been reclassified to conform with the current year presentation. These reclassifications did not affect net income. As of December 31, 2015 , our banking business is conducted through seven locally managed and branded segments in distinct geographical areas. Performance assessment and resource allocation are based upon this geographical structure. Zions Bank operates 99 branches in Utah, 24 branches in Idaho, and one branch in Wyoming. CB&T operates 94 branches in California. Amegy operates 77 branches in Texas. NBAZ operates 67 branches in Arizona. NSB operates 49 branches in Nevada. Vectra operates 36 branches in Colorado and one branch in New Mexico. TCBW operates one branch in the Washington and one branch in Oregon. The operating segment identified as “Other” includes the Parent, Zions Management Services Company (“ZMSC”) (which was merged into Zions First National Bank on December 31,2015), certain nonbank financial service subsidiaries, and eliminations of transactions between segments. The Parent’s operations are significant to the Other segment. The Company’s net interest income is substantially affected by the Parent’s interest expense on long-term debt. The Parent’s financial statements in Note 23 provide more information about the Parent’s activities. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the Other segment. ZMSC provided internal technology and operational services to affiliated operating businesses of the Company. ZMSC charges most of its costs to the affiliates on an approximate break-even basis. The accounting policies of the individual operating segments are the same as those of the Company. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations. Operating segments pay for centrally provided services based upon estimated or actual usage of those services. The following is a summary of selected operating segment information: (In millions) Zions Bank Amegy CB&T 2015 2014 2013 2015 2014 2013 2015 2014 2013 CONDENSED INCOME STATEMENT Net interest income $ 583.0 $ 581.4 $ 595.0 $ 398.0 $ 386.8 $ 386.5 $ 390.8 $ 412.5 $ 469.0 Provision for loan losses (28.3 ) (58.5 ) (40.5 ) 91.3 32.2 4.2 (4.4 ) (20.1 ) (16.7 ) Net interest income after provision for loan losses 611.3 639.9 635.5 306.7 354.6 382.3 395.2 432.6 485.7 Net impairment losses on investment securities — — (7.7 ) — — — — — — Loss on sale of investment securities to Parent — — — — — — — — — Other noninterest income 136.3 206.4 199.9 137.9 140.4 137.0 74.1 53.9 79.3 Noninterest expense 514.7 494.3 481.4 379.8 357.3 333.3 295.9 321.3 352.4 Income (loss) before income taxes and minority interest 232.9 352.0 346.3 64.8 137.7 186.0 173.4 165.2 212.6 Income tax expense (benefit) 82.6 130.4 121.7 20.0 44.5 58.6 67.2 63.9 72.5 Net income (loss) 150.3 221.6 224.6 44.8 93.2 127.4 106.2 101.3 140.1 Net income (loss) applicable to noncontrolling interests 0.9 1.2 — — — — — — — Net income (loss) applicable to controlling interest $ 149.4 $ 220.4 $ 224.6 $ 44.8 $ 93.2 $ 127.4 $ 106.2 $ 101.3 $ 140.1 YEAR-END BALANCE SHEET DATA Total assets $ 19,744 $ 19,079 $ 18,590 $ 14,062 $ 13,888 $ 13,620 $ 12,187 $ 11,340 $ 10,923 Cash and due from banks 375 385 362 228 219 407 56 85 157 Money market investments 1,118 3,384 3,890 2,072 2,199 2,551 1,814 1,670 1,108 Total securities 5,103 2,331 1,520 465 277 362 714 296 331 Total loans 12,334 12,251 12,259 10,115 10,077 9,217 8,832 8,530 8,574 Total deposits 16,900 16,633 16,257 11,634 11,491 11,199 10,520 9,707 9,328 Shareholders’ equity: Preferred equity 280 280 280 226 226 226 162 162 162 Common equity 1,693 1,615 1,523 2,030 1,998 1,988 1,424 1,390 1,342 Noncontrolling interests 32 11 — — — — — — — Total shareholders’ equity 2,005 1,906 1,803 2,256 2,224 2,214 1,586 1,552 1,504 (In millions) NBAZ NSB Vectra 2015 2014 2013 2015 2014 2013 2015 2014 2013 CONDENSED INCOME STATEMENT Net interest income $ 160.6 $ 162.0 $ 163.0 $ 112.9 $ 112.9 $ 113.6 $ 103.7 $ 102.1 $ 102.7 Provision for loan losses 7.9 (21.5 ) (15.0 ) (28.3 ) (20.9 ) (12.0 ) 4.7 (8.4 ) (4.9 ) Net interest income after provision for loan losses 152.7 183.5 178.0 141.2 133.8 125.6 99.0 110.5 107.6 Net impairment losses on investment securities — — — — — (3.3 ) — — (0.1 ) Loss on sale of investment securities to Parent — — — — — — — — — Other noninterest income 38.6 36.0 35.0 35.7 32.2 37.8 21.0 19.9 24.6 Noninterest expense 131.5 145.1 142.7 129.5 132.8 131.8 97.2 98.3 99.5 Income (loss) before income taxes and minority interest 59.8 74.4 70.3 47.4 33.2 28.3 22.8 32.1 32.6 Income tax expense (benefit) 17.8 27.9 26.4 15.9 10.9 9.5 7.1 10.7 11.2 Net income (loss) 42.0 46.5 43.9 31.5 22.3 18.8 15.7 21.4 21.4 Net income (loss) applicable to noncontrolling interests — — — — — — — — — Net income (loss) applicable to controlling interest $ 42.0 $ 46.5 $ 43.9 $ 31.5 $ 22.3 $ 18.8 $ 15.7 $ 21.4 $ 21.4 YEAR-END BALANCE SHEET DATA Total assets $ 5,024 $ 4,771 $ 4,579 $ 4,441 $ 4,096 $ 3,980 $ 3,310 $ 2,999 $ 2,571 Cash and due from banks 80 51 77 54 51 79 32 28 51 Money market investments 238 371 221 1,036 655 710 475 407 6 Total securities 601 395 362 920 831 774 274 179 166 Total loans 3,909 3,750 3,724 2,285 2,421 2,297 2,468 2,320 2,278 Total deposits 4,369 4,133 3,931 4,035 3,690 3,590 2,889 2,591 2,178 Shareholders’ equity: Preferred equity 85 85 120 50 50 50 25 25 70 Common equity 522 481 418 330 332 317 331 315 246 Noncontrolling interests — — — — — — — — — Total shareholders’ equity 607 566 538 380 382 367 356 340 316 (In millions) TCBW Other Consolidated Company 2015 2014 2013 2015 2014 2013 2015 2014 2013 CONDENSED INCOME STATEMENT Net interest income $ 30.2 $ 31.5 $ 30.1 $ (63.9 ) $ (109.2 ) $ (163.6 ) $ 1,715.3 $ 1,680.0 $ 1,696.3 Provision for loan losses (2.9 ) (0.9 ) (2.3 ) — — 0.1 40.0 (98.1 ) (87.1 ) Net interest income after provision for loan losses 33.1 32.4 32.4 (63.9 ) (109.2 ) (163.7 ) 1,675.3 1,778.1 1,783.4 Net impairment losses on investment securities — — — — — (154.0 ) — — (165.1 ) Loss on sale of investment securities to Parent — — (2.7 ) — — 2.7 — — — Other noninterest income 4.8 2.5 4.6 (71.3 ) 17.3 (15.7 ) 377.1 508.6 502.5 Noninterest expense 16.5 33.4 22.2 35.4 82.8 151.1 1,600.5 1,665.3 1,714.4 Income (loss) before income taxes and minority interest 21.4 1.5 12.1 (170.6 ) (174.7 ) (481.8 ) 451.9 621.4 406.4 Income tax expense (benefit) 7.2 0.5 4.2 (75.4 ) (65.9 ) (161.2 ) 142.4 222.9 142.9 Net income (loss) 14.2 1.0 7.9 (95.2 ) (108.8 ) (320.6 ) 309.5 398.5 263.5 Net income (loss) applicable to noncontrolling interests — — — (0.9 ) (1.2 ) (0.3 ) — — (0.3 ) Net income (loss) applicable to controlling interest $ 14.2 $ 1.0 $ 7.9 $ (94.3 ) $ (107.6 ) $ (320.3 ) $ 309.5 $ 398.5 $ 263.8 YEAR-END BALANCE SHEET DATA Total assets $ 1,198 $ 970 $ 1,010 $ (296 ) $ 66 $ 758 $ 59,670 $ 57,209 $ 56,031 Cash and due from banks 22 34 31 (49 ) (11 ) 9 798 842 1,173 Money market investments 349 123 182 (374 ) (245 ) (209 ) 6,728 8,564 8,459 Total securities 110 83 93 50 170 717 8,237 4,562 4,325 Total loans 704 713 689 3 2 5 40,650 40,064 39,043 Total deposits 986 816 845 (959 ) (1,213 ) (965 ) 50,374 47,848 46,363 Shareholders’ equity: Preferred equity 3 3 3 (2 ) 173 93 829 1,004 1,004 Common equity 116 103 101 233 132 (474 ) 6,679 6,366 5,461 Noncontrolling interests — — — (32 ) (11 ) — — — — Total shareholders’ equity 119 106 104 199 294 (381 ) 7,508 7,370 6,465

Quarterly Financial Information

Quarterly Financial Information	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	22. QUARTERLY FINANCIAL INFORMATION (UNAUDITED) Financial information by quarter for 2015 and 2014 is as follows: Quarters (In thousands, except per share amounts) First Second Third Fourth Year 2015 Gross interest income $ 448,446 $ 455,236 $ 456,230 $ 473,559 $ 1,833,471 Net interest income 417,346 423,704 425,377 448,833 1,715,260 Provision for loan losses (1,494 ) 566 18,262 22,701 40,035 Noninterest income: Investment securities gains (losses), net 3,114 (133,597 ) 3,577 46 (126,860 ) Other noninterest income 118,708 134,018 127,236 124,018 503,980 Noninterest expense 397,461 404,100 396,149 402,776 1,600,486 Income before income taxes 143,201 19,459 141,779 147,420 451,859 Net income 92,025 13,960 100,999 102,487 309,471 Preferred stock dividends (16,746 ) (15,060 ) (16,761 ) (14,290 ) (62,857 ) Net earnings (loss) applicable to common shareholders 75,279 (1,100 ) 84,238 88,197 246,614 Net earnings (loss) per common share: Basic $ 0.37 $ (0.01 ) $ 0.41 $ 0.43 $ 1.20 Diluted 0.37 (0.01 ) 0.41 0.43 1.20 2014 Gross interest income $ 467,574 $ 463,192 $ 460,276 $ 461,960 $ 1,853,002 Net interest income 416,471 416,284 416,819 430,430 1,680,004 Provision for loan losses (610 ) (54,416 ) (54,643 ) 11,587 (98,082 ) Noninterest income: Net impairment losses on investment securities (27 ) — — — (27 ) Investment securities gains (losses), net 31,826 7,539 (13,461 ) (2,014 ) 23,890 Other noninterest income 106,514 117,310 129,532 131,410 484,766 Noninterest expense 398,063 406,027 438,536 422,666 1,665,292 Income before income taxes 157,331 189,522 148,997 125,573 621,423 Net income 101,210 119,550 95,888 81,814 398,462 Preferred stock dividends (25,020 ) (15,060 ) (16,761 ) (15,053 ) (71,894 ) Net earnings applicable to common shareholders 76,190 104,490 79,127 66,761 326,568 Net earnings per common share: Basic $ 0.41 $ 0.56 $ 0.40 $ 0.33 $ 1.68 Diluted 0.41 0.56 0.40 0.33 1.68 Certain prior year amounts have been reclassified to conform with the current year presentation. These reclassifications did not affect net income. See related discussion in Note 1. As discussed in Note 5, we recognized a loss during the second quarter of 2015 on the sale of our remaining CDO investment securities.

Parent Company Financial Inform

Parent Company Financial Information	12 Months Ended
	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	23. PARENT COMPANY FINANCIAL INFORMATION CONDENSED BALANCE SHEETS (In thousands) December 31, 2015 2014 ASSETS Cash and due from banks $ 18,375 $ 23,774 Interest-bearing deposits 775,649 1,007,916 Security resell agreements 100,000 — Investment securities: Held-to-maturity, at adjusted cost (approximate fair value $0 and $34,691) — 17,292 Available-for-sale, at fair value 45,168 130,964 Other noninterest-bearing investments 28,178 33,577 Investments in subsidiaries: Commercial bank 7,312,654 7,094,597 Other subsidiaries 84,010 94,681 Receivables from subsidiaries: Other subsidiaries 60 15,060 Other assets 83,710 106,233 $ 8,447,804 $ 8,524,094 LIABILITIES AND SHAREHOLDERS’ EQUITY Other liabilities $ 123,849 $ 85,480 Subordinated debt to affiliated trusts 164,950 168,043 Long-term debt: Due to affiliates — 20 Due to others 651,486 901,021 Total liabilities 940,285 1,154,564 Shareholders’ equity: Preferred stock 828,490 1,004,011 Common stock 4,766,731 4,723,855 Retained earnings 1,966,910 1,769,705 Accumulated other comprehensive loss (54,612 ) (128,041 ) Total shareholders’ equity 7,507,519 7,369,530 $ 8,447,804 $ 8,524,094 Prior period amounts have been adjusted to reflect changes in the legal entity structure resulting from our charter consolidation discussed in Note 1. CONDENSED STATEMENTS OF INCOME (In thousands) Year Ended December 31, 2015 2014 2013 Interest income: Commercial bank $ 1,162 $ 1,489 $ 862 Other subsidiaries 3 16 — Other loans and securities 3,014 10,900 17,764 Total interest income 4,179 12,405 18,626 Interest expense: Affiliated trusts 4,308 4,265 12,202 Other borrowed funds 63,665 117,700 172,480 Total interest expense 67,973 121,965 184,682 Net interest loss (63,794 ) (109,560 ) (166,056 ) Provision for loan losses — — (23 ) Net interest loss after provision for loan losses (63,794 ) (109,560 ) (166,033 ) Other income: Dividends from consolidated subsidiaries: Commercial bank 233,853 236,012 421,406 Other subsidiaries 100 400 200 Equity and fixed income securities gains (losses), net 37,161 300,275 (7,332 ) Net impairment losses on investment securities — — (95,637 ) Other income (loss) 12,512 6,475 (8,285 ) 283,626 543,162 310,352 Expenses: Salaries and employee benefits 24,674 17,457 26,014 Debt extinguishment cost 135 44,422 120,192 Other operating expenses 10,473 10,559 1,436 35,282 72,438 147,642 Income (loss) before income taxes and undistributed income (loss) of consolidated subsidiaries 184,550 361,164 (3,323 ) Income tax expense (benefit) (27,140 ) 55,865 (135,472 ) Income before equity in undistributed income of consolidated subsidiaries 211,690 305,299 132,149 Equity in undistributed income (loss) of consolidated subsidiaries: Commercial bank 108,350 97,673 129,562 Other subsidiaries (10,569 ) (4,510 ) 2,080 Net income 309,471 398,462 263,791 Preferred stock dividends (62,857 ) (71,894 ) (95,512 ) Preferred stock redemption — — 125,700 Net earnings applicable to common shareholders $ 246,614 $ 326,568 $ 293,979 Prior period amounts have been adjusted to reflect changes in the legal entity structure resulting from our charter consolidation discussed in Note 1. CONDENSED STATEMENTS OF CASH FLOWS (In thousands) Year Ended December 31, 2015 2014 2013 CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 309,471 $ 398,462 $ 263,791 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed net income of consolidated subsidiaries (97,781 ) (93,163 ) (131,642 ) Net impairment losses on investment securities — — 95,637 Debt extinguishment cost 135 44,422 120,192 Other, net 78,580 149,280 69,394 Net cash provided by operating activities 290,405 499,001 417,372 CASH FLOWS FROM INVESTING ACTIVITIES Net decrease (increase) in money market investments 132,267 (1,007,844 ) 650,736 Collection of advances to subsidiaries 56,000 15,000 10,000 Advances to subsidiaries (41,000 ) (30,060 ) (10,000 ) Proceeds from sales and maturities of investment securities 124,419 372,357 27,916 Purchases of investment securities (46,851 ) — (4,858 ) Decrease of investment in subsidiaries 15,000 6,310 175,000 Other, net 4,010 24,319 10,642 Net cash provided by (used in) investing activities 243,845 (619,918 ) 859,436 CASH FLOWS FROM FINANCING ACTIVITIES Net change in short-term funds borrowed — — (3,368 ) Proceeds from issuance of long-term debt — — 646,408 Repayments of long-term debt (271,120 ) (1,147,641 ) (835,031 ) Debt extinguishment cost paid (135 ) (35,435 ) (45,812 ) Proceeds from issuance of preferred stock — — 784,318 Proceeds from issuance of common stock 22,392 526,438 9,825 Cash paid for preferred stock redemptions (175,669 ) — (799,468 ) Dividends paid on preferred stock (62,857 ) (64,868 ) (95,512 ) Dividends paid on common stock (45,198 ) (31,262 ) (24,148 ) Other, net (7,062 ) (5,619 ) (16,137 ) Net cash used in financing activities (539,649 ) (758,387 ) (378,925 ) Net increase (decrease) in cash and due from banks (5,399 ) (879,304 ) 897,883 Cash and due from banks at beginning of year 23,774 903,078 5,195 Cash and due from banks at end of year $ 18,375 $ 23,774 $ 903,078 The Parent paid interest of $51.4 million in 2015 , $100.6 million in 2014 , and $130.9 million in 2013 . Prior period amounts have been adjusted to reflect changes in the legal entity structure resulting from our charter consolidation discussed in Note 1.

Summary Of Significant Accoun32

Summary Of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Business	Business Zions Bancorporation (“the Parent”) is a financial holding company headquartered in Salt Lake City, Utah, which in 2015 provided a full range of banking and related services through seven subsidiary banks in 11 Western and Southwestern states as follows: Zions Bank, in Utah, Idaho and Wyoming; California Bank & Trust (“CB&T”); Amegy Bank, N. A. (“Amegy”), in Texas; National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado, N.A. (“Vectra”), in Colorado and New Mexico; and The Commerce Bank of Washington (“TCBW”) which operates under that name in Washington and under the name The Commerce Bank of Oregon (“TCBO”) in Oregon. Pursuant to a Board resolution adopted November 21, 2014, The Commerce Bank of Oregon merged into TCBW effective March 31, 2015. The Parent also owns and operates certain nonbank subsidiaries that engage in financial services.
Basis Of Financial Statement Presentation	Basis of Financial Statement Presentation The consolidated financial statements include the accounts of the Parent and its majority-owned subsidiaries (“the Company,” “we,” “our,” “us”). Unconsolidated investments in which there is a greater than 20% ownership are accounted for by the equity method of accounting; those in which there is less than 20% ownership are accounted for under cost, fair value, or equity methods of accounting. All significant intercompany accounts and transactions have been eliminated in consolidation. The consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and prevailing practices within the financial services industry. References to GAAP, including standards promulgated by the Financial Accounting Standards Board (“FASB”), are made according to sections of the Accounting Standards Codification (“ASC”). Changes to the ASC are made with Accounting Standards Updates (“ASU”) that include consensus issues of the Emerging Issues Task Force (“EITF”). In certain cases, ASUs are issued jointly with International Financial Reporting Standards (“IFRS”). In preparing the consolidated financial statements, we are required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Reclassification Policy	Certain prior year amounts have been reclassified to conform with the current year presentation.
Variable Interest Entities	Variable Interest Entities A variable interest entity (“VIE”) is consolidated when a company is the primary beneficiary of the VIE. Current accounting guidance requires continuous analysis on a qualitative rather than a quantitative basis to determine the primary beneficiary of a VIE. At the commencement of our involvement and periodically thereafter, we consider our consolidation conclusions for all entities with which we are involved. As of December 31, 2015 and 2014 , no VIEs have been consolidated in the Company’s financial statements.
Statement Of Cash Flows	Statement of Cash Flows For purposes of presentation in the consolidated statements of cash flows, “cash and cash equivalents” are defined as those amounts included in cash and due from banks in the consolidated balance sheets.
Security Resell Agreements	Security Resell Agreements Security resell agreements represent overnight and term agreements with the majority maturing within 30 days. These agreements are generally treated as collateralized financing transactions and are carried at amounts at which the securities were acquired plus accrued interest. Either the Company, or in some instances third parties on its behalf, take possession of the underlying securities. The fair value of such securities is monitored throughout the contract term to ensure that asset values remain sufficient to protect against counterparty default. We are permitted by contract to sell or repledge certain securities that we accept as collateral for security resell agreements. If sold, our obligation to return the collateral is recorded as “securities sold, not yet purchased” and included as a liability in “Federal funds and other short-term borrowings.” At December 31, 2015 , we held approximately $457 million of securities for which we were permitted by contract to sell or repledge. Security resell agreements averaged approximately $569 million during 2015 , and the maximum amount outstanding at any month-end during 2015 was approximately $1.6 billion .
Investment Securities	Investment Securities We classify our investment securities according to their purpose and holding period. Gains or losses on the sale of securities are recognized using the specific identification method and recorded in noninterest income. Held-to-maturity (“HTM”) debt securities are carried at amortized cost with purchase discounts or premiums accreted or amortized into interest income over the contractual life of the security. The Company has the intent and ability to hold such securities until maturity. Available-for-sale (“AFS”) securities are stated at fair value and generally consist of debt securities held for investment and marketable equity securities not accounted for under the equity method. Unrealized gains and losses of AFS securities, after applicable taxes, are recorded as a component of other comprehensive income (“OCI”). We review quarterly our investment securities portfolio for any declines in value that are considered to be other-than-temporary impairment (“OTTI”). The process, methodology and factors considered to evaluate securities for OTTI are discussed further in Note 5. Trading securities are stated at fair value and consist of securities acquired for short-term appreciation or other trading purposes. Realized and unrealized gains and losses are recorded in trading income, which is included in capital markets and foreign exchange. The fair values of investment securities, as estimated under current accounting guidance, are discussed in Note 20.
Loans And Allowance For Credit Losses	Loans and Allowance for Credit Losses Loans are reported at the principal amount outstanding, net of unearned income. Unearned income, which includes deferred fees net of deferred direct loan origination costs, is amortized to interest income over the life of the loan using the interest method. Interest income is recognized on an accrual basis. Estimated prepayments are used in the determination of the amount of amortization. At the time of origination, we determine whether loans will be held for investment or held for sale. We may subsequently change our intent to hold loans for investment and reclassify them as held for sale. Loans held for sale are carried at the lower of aggregate cost or fair value. A valuation allowance is recorded when cost exceeds fair value based on reviews at the time of reclassification and periodically thereafter. Gains and losses are recorded in noninterest income based on the difference between sales proceeds and carrying value. Loans that become other than current with respect to contractual payments due may be accounted for separately depending on the status of the loan, which is determined from certain credit quality indicators and analysis under the circumstances. The loan status includes past due, nonaccrual, impaired, modified, and restructured (including troubled debt restructurings “TDRs”). Our accounting policies for these loan types and our estimation of the related allowance for loan losses are discussed further in Note 6. In the ordinary course of business, we transfer portions of loans under participation agreements to manage credit risk and our portfolio concentration. We evaluate the loan participations to determine if they meet the appropriate accounting guidance to qualify as sales. Certain purchased loans require separate accounting procedures that are also discussed in Note 6. The allowance for credit losses (“ACL”) includes the allowance for loan losses and the reserve for unfunded lending commitments, and represents our estimate of losses inherent in the loan portfolio that may be recognized from loans and lending commitments that are not recoverable. Further discussion of our estimation process for the ACL is included in Note 6.
Other Real Estate Owned
Nonmarketable Securities
Premises And Equipment	Premises and Equipment Premises and equipment are stated at cost, net of accumulated depreciation and amortization. Depreciation, computed primarily on the straight-line method, is charged to operations over the estimated useful lives of the properties, generally 25 to 40 years for buildings, 3 to 10 years for furniture and equipment, and 3 to 10 years for software, including capitalized costs related to the Company’s new lending and deposit systems. Leasehold improvements are amortized over the terms of the respective leases or the estimated useful lives of the improvements, whichever is shorter.
Business Combinations	Business Combinations Business combinations are accounted for under the acquisition method of accounting. Upon initially obtaining control, we recognize 100% of all acquired assets and all assumed liabilities regardless of the percentage owned. The assets and liabilities are recorded at their estimated fair values, with goodwill being recorded when such fair values are less than the cost of acquisition. Certain transaction and restructuring costs are expensed as incurred. Changes to estimated fair values from a business combination are recognized as an adjustment to goodwill over the measurement period, which cannot exceed one year from the acquisition date. Results of operations of the acquired business are included in our statement of income from the date of acquisition.
Goodwill And Identifiable Intangible Assets
Derivative Instruments	Derivative Instruments We use derivative instruments, including interest rate swaps and floors and basis swaps, as part of our overall interest rate risk management strategy. These instruments enable us to manage to desired asset and liability duration and to reduce interest rate risk exposure by matching estimated repricing periods of interest-sensitive assets and liabilities. We also execute derivative instruments with commercial banking customers to facilitate their risk management strategies. These derivatives are immediately hedged by offsetting derivatives with third parties such that we minimize our net risk exposure as a result of such transactions. We record all derivatives at fair value in the balance sheet as either other assets or other liabilities. See further discussion in Note 7.
Commitments And Letters Of Credit	Commitments and Letters of Credit In the ordinary course of business, we enter into commitments to extend credit, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded in the financial statements when they become payable. The credit risk associated with these commitments is evaluated in a manner similar to the allowance for loan losses. The RULC is presented separately in the balance sheet.
Share-Based Compensation	Share-Based Compensation Share-based compensation generally includes grants of stock options, restricted stock, restricted stock units, and other awards to employees and nonemployee directors. We recognize compensation expense in the statement of income based on the fair value of the associated share-based awards. See further discussion in Note 16.
Income Taxes	Income Taxes Deferred tax assets and liabilities are determined based on temporary differences between financial statement asset and liability amounts and their respective tax bases, and are measured using enacted tax laws and rates. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are recognized subject to management’s judgment that realization is more likely than not. Unrecognized tax benefits for uncertain tax positions relate primarily to state tax contingencies. See further discussion in Note 14.
Net Earnings Per Common Share	Net Earnings Per Common Share Net earnings per common share is based on net earnings applicable to common shareholders, which is net of preferred stock dividends. Basic net earnings per common share is based on the weighted average outstanding common shares during each year. Unvested share-based awards with rights to receive nonforfeitable dividends are considered participating securities and included in the computation of basic earnings per share. Diluted net earnings per common share is based on the weighted average outstanding common shares during each year, including common stock equivalents. Stock options, restricted stock, restricted stock units, and stock warrants are converted to common stock equivalents using the treasury method. Diluted net earnings per common share excludes common stock equivalents whose effect is antidilutive. See further discussion in Note 15.

Supplemental Cash Flow Inform33

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]
Schedule Of Noncash Activities	Noncash activities are summarized as follows: (In thousands) Year Ended December 31, 2015 2014 2013 Loans and leases transferred to other real estate owned $ 11,924 $ 25,189 $ 60,749 Loans and leases reclassified as loans held for sale 5,048 (26,272 ) 36,301 Adjusted cost of HTM securities reclassified to AFS securities 79,276 — 181,915 Preferred stock/beneficial conversion feature transferred to retained earnings as result of the Series C preferred stock redemption — — 125,700

Offsetting Assets and Liabili34

Offsetting Assets and Liabilities Gross and net information for selecting financial instruments (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value, by Balance Sheet Grouping [Table Text Block]	December 31, 2015 (In thousands) Gross amounts not offset in the balance sheet Description Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Cash collateral received/pledged Net amount Assets: Federal funds sold and security resell agreements $ 619,758 $ — $ 619,758 $ — $ — $ 619,758 Derivatives (included in other assets) 77,638 — 77,638 (5,916 ) — 71,722 $ 697,396 $ — $ 697,396 $ (5,916 ) $ — $ 691,480 Liabilities: Federal funds and other short-term borrowings $ 346,987 $ — $ 346,987 $ — $ — $ 346,987 Derivatives (included in other liabilities) 72,568 — 72,568 (5,916 ) (61,134 ) 5,518 $ 419,555 $ — $ 419,555 $ (5,916 ) $ (61,134 ) $ 352,505 December 31, 2014 (In thousands) Gross amounts not offset in the balance sheet Description Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Cash collateral received/pledged Net amount Assets: Federal funds sold and security resell agreements $ 1,386,291 $ — $ 1,386,291 $ — $ — $ 1,386,291 Derivatives (included in other assets) 66,420 — 66,420 (3,845 ) (18 ) 62,557 $ 1,452,711 $ — $ 1,452,711 $ (3,845 ) $ (18 ) $ 1,448,848 Liabilities: Federal funds and other short-term borrowings $ 244,223 $ — $ 244,223 $ — $ — $ 244,223 Derivatives (included in other liabilities) 66,064 — 66,064 (3,845 ) (57,547 ) 4,672 $ 310,287 $ — $ 310,287 $ (3,845 ) $ (57,547 ) $ 248,895 December 31, 2015 December 31, 2014 (Amounts in thousands) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 545,648 $ 552,088 2 $ 647,252 $ 677,196 3 Loans and leases (including loans held for sale), net of allowance 40,193,374 39,535,365 3 39,591,499 39,426,141 3 Financial liabilities: Time deposits 2,130,680 2,129,742 2 2,406,924 2,408,550 2 Foreign deposits 294,391 294,321 2 328,391 328,447 2 Long-term debt (less fair value hedges) 817,348 838,796 2 1,090,778 1,159,287 2

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2015
Net Investment Income [Line Items]
Summary Of Investment Securities	December 31, 2015 (In thousands) Amortized cost Gross unrealized gains Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 545,648 $ 11,218 $ 4,778 $ 552,088 Available-for-sale U.S. Government agencies and corporations: Agency securities 1,231,740 4,313 2,658 1,233,395 Agency guaranteed mortgage-backed securities 3,964,593 7,919 36,037 3,936,475 Small Business Administration loan-backed securities 1,932,817 12,602 14,445 1,930,974 Municipal securities 417,374 2,177 856 418,695 Other debt securities 25,454 152 2,665 22,941 7,571,978 27,163 56,661 7,542,480 Money market mutual funds and other 100,612 61 37 100,636 7,672,590 27,224 56,698 7,643,116 Total $ 8,218,238 $ 38,442 $ 61,476 $ 8,195,204 December 31, 2014 Recognized in OCI 1 Not recognized in OCI (In thousands) Amortized cost Gross unrealized gains Gross unrealized losses Carrying value Gross unrealized gains Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 607,675 $ — $ — $ 607,675 $ 13,018 $ 804 $ 619,889 Asset-backed securities: Trust preferred securities – banks and insurance 79,276 — 39,699 39,577 18,393 663 57,307 686,951 — 39,699 647,252 31,411 1,467 677,196 Available-for-sale U.S. Government agencies and corporations: Agency securities 607,523 1,572 8,343 600,752 600,752 Agency guaranteed mortgage-backed securities 935,164 12,132 2,105 945,191 945,191 Small Business Administration loan-backed securities 1,544,710 16,446 8,891 1,552,265 1,552,265 Municipal securities 189,059 1,143 945 189,257 189,257 Asset-backed securities: Trust preferred securities – banks and insurance 537,589 103 121,984 415,708 415,708 Other 5,252 207 7 5,452 5,452 3,819,297 31,603 142,275 3,708,625 3,708,625 Mutual funds and other 136,591 76 1,044 135,623 135,623 3,955,888 31,679 143,319 3,844,248 3,844,248 Total $ 4,642,839 $ 31,679 $ 183,018 $ 4,491,500 $ 4,521,444 1 The gross unrealized losses recognized in OCI on HTM securities resulted from a previous transfer of AFS securities to HTM
Contractual Maturities Debt Securities	Held-to-maturity Available-for-sale (In thousands) Amortized cost Estimated fair value Amortized cost Estimated fair value Due in one year or less $ 64,213 $ 64,453 $ 1,040,087 $ 1,036,107 Due after one year through five years 198,818 202,124 2,932,469 2,921,436 Due after five years through ten years 153,325 156,676 2,606,838 2,597,827 Due after ten years 129,292 128,835 992,584 987,110 $ 545,648 $ 552,088 $ 7,571,978 $ 7,542,480
Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value	December 31, 2015 Less than 12 months 12 months or more Total (In thousands) Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 4,521 $ 122,197 $ 257 $ 13,812 $ 4,778 $ 136,009 Asset-backed securities: Trust preferred securities – banks and insurance — — — — — — 4,521 122,197 257 13,812 4,778 136,009 Available-for-sale U.S. Government agencies and corporations: Agency securities 2,176 559,196 482 131,615 2,658 690,811 Agency guaranteed mortgage-backed securities 34,583 3,639,824 1,454 65,071 36,037 3,704,895 Small Business Administration loan-backed securities 5,348 567,365 9,097 535,376 14,445 1,102,741 Municipal securities 735 102,901 121 5,733 856 108,634 Other — — 2,665 12,337 2,665 12,337 Asset-backed securities: Trust preferred securities – banks and insurance — — — — — — Auction rate securities — — — — — — 42,842 4,869,286 13,819 750,132 56,661 5,619,418 Mutual funds and other 37 35,488 — — 37 35,488 42,879 4,904,774 13,819 750,132 56,698 5,654,906 Total $ 47,400 $ 5,026,971 $ 14,076 $ 763,944 $ 61,476 $ 5,790,915 December 31, 2014 Less than 12 months 12 months or more Total (In thousands) Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 527 $ 62,762 $ 277 $ 14,003 $ 804 $ 76,765 Asset-backed securities: Trust preferred securities – banks and insurance 53 122 40,309 57,186 40,362 57,308 580 62,884 40,586 71,189 41,166 134,073 Available-for-sale U.S. Government agencies and corporations: Agency securities 4,510 295,694 3,833 101,188 8,343 396,882 Agency guaranteed mortgage-backed securities 1,914 425,114 191 12,124 2,105 437,238 Small Business Administration loan-backed securities 5,869 495,817 3,022 175,523 8,891 671,340 Municipal securities 258 36,551 687 4,616 945 41,167 Asset-backed securities: Trust preferred securities – banks and insurance — — 121,984 405,605 121,984 405,605 Auction rate securities 7 1,607 — — 7 1,607 12,558 1,254,783 129,717 699,056 142,275 1,953,839 Mutual funds and other 1,044 71,907 — — 1,044 71,907 13,602 1,326,690 129,717 699,056 143,319 2,025,746 Total $ 14,182 $ 1,389,574 $ 170,303 $ 770,245 $ 184,485 $ 2,159,819
Rollforward Of Total Amount Of Credit-Related OTTI	The following is a tabular rollforward of the total amount of credit-related OTTI, including amounts recognized in earnings: (In thousands) 2015 2014 HTM AFS Total HTM AFS Total Balance of credit-related OTTI at beginning of year $ (9,079 ) $ (95,472 ) $ (104,551 ) $ (9,052 ) $ (176,833 ) $ (185,885 ) Additions recognized in earnings during the year: Credit-related OTTI not previously recognized 1 — — — — — — Credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost basis 2 — — — (27 ) — (27 ) Subtotal of amounts recognized in earnings — — — (27 ) — (27 ) Transfers from HTM to AFS 9,079 (9,079 ) — — — — Reductions for securities sold or paid off during the year — 104,551 104,551 — 81,361 81,361 Reductions for securities the Company intends to sell or will be required to sell before recovery of its amortized cost basis — — — — — — Balance of credit-related OTTI at end of year $ — $ — $ — $ (9,079 ) $ (95,472 ) $ (104,551 )
Noncredit Related OTTI	(In thousands) 2015 2014 2013 HTM $ — $ — $ 16,114 AFS — — 7,358 $ — $ — $ 23,472
Gains And Losses, Including OTTI, Recognized In Statement Of Income	The following summarizes gains and losses, including OTTI, that were recognized in the statement of income: 2015 2014 2013 (In thousands) Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Investment securities: Held-to-maturity $ 1 $ — $ 18 $ 27 $ 81 $ 403 Available-for-sale 8,443 147,656 92,525 83,815 13,881 181,591 Other noninterest-bearing investments 25,045 12,693 23,706 8,544 10,182 1,662 33,489 160,349 116,249 92,386 24,144 183,656 Net gains (losses) $ (126,860 ) $ 23,863 $ (159,512 ) Statement of income information: Net impairment losses on investment securities $ — $ (27 ) $ (165,134 ) Equity securities gains, net 11,875 13,471 8,520 Fixed income securities gains (losses), net (138,735 ) 10,419 (2,898 ) Net gains (losses) $ (126,860 ) $ 23,863 $ (159,512 )
Tax and Nontaxable Interest Income by Investment Type [Table Text Block]	(In thousands) 2015 2014 2013 Taxable Nontaxable Total Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 12,777 $ 10,892 $ 23,669 $ 14,770 $ 11,264 $ 26,034 $ 19,905 $ 11,375 $ 31,280 Available-for-sale 94,877 3,326 98,203 71,365 2,558 73,923 69,061 2,046 71,107 Trading 2,214 — 2,214 1,979 — 1,979 1,055 — 1,055 $ 109,868 $ 14,218 $ 124,086 $ 88,114 $ 13,822 $ 101,936 $ 90,021 $ 13,421 $ 103,442

Loans And Allowance For Credi36

Loans And Allowance For Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2015
Loans And Allowance For Credit Losses [Abstract]
Summary Of Major Portfolio Segment And Specific Loan Class	December 31, (In thousands) 2015 2014 Loans held for sale $ 149,880 $ 132,504 Commercial: Commercial and industrial $ 13,211,481 $ 13,162,955 Leasing 441,666 408,974 Owner occupied 7,150,028 7,351,548 Municipal 675,839 520,887 Total commercial 21,479,014 21,444,364 Commercial real estate: Construction and land development 1,841,502 1,986,408 Term 8,514,401 8,126,600 Total commercial real estate 10,355,903 10,113,008 Consumer: Home equity credit line 2,416,357 2,321,150 1-4 family residential 5,382,099 5,200,882 Construction and other consumer real estate 385,240 370,542 Bankcard and other revolving plans 443,780 401,352 Other 187,149 212,360 Total consumer 8,814,625 8,506,286 Total loans $ 40,649,542 $ 40,063,658
Summary Of Changes in The Allowance For Credit Losses	December 31, 2015 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of year $ 412,514 $ 145,009 $ 47,140 $ 604,663 Additions: Provision for loan losses 96,995 (51,777 ) (5,183 ) 40,035 Adjustment for FDIC-supported/PCI loans (57 ) 57 5 5 Deductions: Gross loan and lease charge-offs (110,437 ) (14,194 ) (14,298 ) (138,929 ) Recoveries 55,262 34,897 10,115 100,274 Net loan and lease (charge-offs) recoveries (55,175 ) 20,703 (4,183 ) (38,655 ) Balance at end of year $ 454,277 $ 113,992 $ 37,779 $ 606,048 Reserve for unfunded lending commitments Balance at beginning of year $ 58,931 $ 21,517 $ 628 $ 81,076 Provision credited to earnings (1,235 ) (4,991 ) (12 ) (6,238 ) Balance at end of year $ 57,696 $ 16,526 $ 616 $ 74,838 Total allowance for credit losses Allowance for loan losses $ 454,277 $ 113,992 $ 37,779 $ 606,048 Reserve for unfunded lending commitments 57,696 16,526 616 74,838 Total allowance for credit losses $ 511,973 $ 130,518 $ 38,395 $ 680,886 December 31, 2014 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of year $ 469,213 $ 216,012 $ 61,066 $ 746,291 Additions: Provision for loan losses (19,691 ) (67,825 ) (10,566 ) (98,082 ) Adjustment for FDIC-supported/PCI loans (1,209 ) — (96 ) (1,305 ) Deductions: Gross loan and lease charge-offs (76,345 ) (15,322 ) (14,543 ) (106,210 ) Recoveries 40,546 12,144 11,279 63,969 Net loan and lease charge-offs (35,799 ) (3,178 ) (3,264 ) (42,241 ) Balance at end of year $ 412,514 $ 145,009 $ 47,140 $ 604,663 Reserve for unfunded lending commitments Balance at beginning of year $ 48,345 $ 37,485 $ 3,875 $ 89,705 Provision charged (credited) to earnings 10,586 (15,968 ) (3,247 ) (8,629 ) Balance at end of year $ 58,931 $ 21,517 $ 628 $ 81,076 Total allowance for credit losses Allowance for loan losses $ 412,514 $ 145,009 $ 47,140 $ 604,663 Reserve for unfunded lending commitments 58,931 21,517 628 81,076 Total allowance for credit losses $ 471,445 $ 166,526 $ 47,768 $ 685,739
Summary Of ALLL And Outstanding Loan Balances According To The Company's Impairment Method	December 31, 2015 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Individually evaluated for impairment $ 36,909 $ 3,154 $ 9,462 $ 49,525 Collectively evaluated for impairment 417,295 110,417 27,866 555,578 Purchased loans with evidence of credit deterioration 73 421 451 945 Total $ 454,277 $ 113,992 $ 37,779 $ 606,048 Outstanding loan balances Individually evaluated for impairment $ 289,629 $ 107,341 $ 92,605 $ 489,575 Collectively evaluated for impairment 21,129,125 10,193,840 8,712,079 40,035,044 Purchased loans with evidence of credit deterioration 60,260 54,722 9,941 124,923 Total $ 21,479,014 $ 10,355,903 $ 8,814,625 $ 40,649,542 December 31, 2014 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Individually evaluated for impairment $ 28,627 $ 4,027 $ 9,059 $ 41,713 Collectively evaluated for impairment 382,552 140,090 37,508 560,150 Purchased loans with evidence of credit deterioration 1,335 892 573 2,800 Total $ 412,514 $ 145,009 $ 47,140 $ 604,663 Outstanding loan balances Individually evaluated for impairment $ 259,207 $ 167,435 $ 95,267 $ 521,909 Collectively evaluated for impairment 21,105,217 9,861,862 8,395,371 39,362,450 Purchased loans with evidence of credit deterioration 79,940 83,711 15,648 179,299 Total $ 21,444,364 $ 10,113,008 $ 8,506,286 $ 40,063,658
Summary Of Nonaccrual Loans	Nonaccrual loans are summarized as follows: December 31, (In thousands) 2015 2014 Commercial: Commercial and industrial $ 163,906 $ 105,591 Leasing 3,829 295 Owner occupied 73,881 87,243 Municipal 951 1,056 Total commercial 242,567 194,185 Commercial real estate: Construction and land development 7,045 23,880 Term 40,253 25,107 Total commercial real estate 47,298 48,987 Consumer: Home equity credit line 8,270 11,430 1-4 family residential 50,254 49,861 Construction and other consumer real estate 748 1,735 Bankcard and other revolving plans 537 196 Other 186 254 Total consumer loans 59,995 63,476 Total $ 349,860 $ 306,648
Summary Of Past Due Loans (Accruing And Nonaccruing)	Past due loans (accruing and nonaccruing) are summarized as follows: December 31, 2015 (In thousands) Current 30-89 days past due 90+ days past due Total past due Total loans Accruing loans 90+ days past due Nonaccrual loans that are current 1 Commercial: Commercial and industrial $ 13,114,045 $ 60,523 $ 36,913 $ 97,436 $ 13,211,481 $ 3,065 $ 117,942 Leasing 440,963 183 520 703 441,666 — 3,309 Owner occupied 7,085,086 37,776 27,166 64,942 7,150,028 3,626 43,984 Municipal 668,207 7,586 46 7,632 675,839 46 951 Total commercial 21,308,301 106,068 64,645 170,713 21,479,014 6,737 166,186 Commercial real estate: Construction and land development 1,835,360 842 5,300 6,142 1,841,502 — 1,745 Term 8,469,390 10,424 34,587 45,011 8,514,401 21,697 24,867 Total commercial real estate 10,304,750 11,266 39,887 51,153 10,355,903 21,697 26,612 Consumer: Home equity credit line 2,407,972 4,717 3,668 8,385 2,416,357 — 3,053 1-4 family residential 5,340,549 14,828 26,722 41,550 5,382,099 1,036 20,939 Construction and other consumer real estate 374,987 8,593 1,660 10,253 385,240 1,337 408 Bankcard and other revolving plans 440,358 1,861 1,561 3,422 443,780 1,217 146 Other 186,436 647 66 713 187,149 — 83 Total consumer loans 8,750,302 30,646 33,677 64,323 8,814,625 3,590 24,629 Total $ 40,363,353 $ 147,980 $ 138,209 $ 286,189 $ 40,649,542 $ 32,024 $ 217,427 December 31, 2014 (In thousands) Current 30-89 days past due 90+ days past due Total past due Total loans Accruing loans 90+ days past due Nonaccrual loans that are current 1 Commercial: Commercial and industrial $ 13,092,731 $ 28,295 $ 41,929 $ 70,224 $ 13,162,955 $ 4,677 $ 64,385 Leasing 408,724 225 25 250 408,974 — 270 Owner occupied 7,275,842 29,182 46,524 75,706 7,351,548 3,334 39,649 Municipal 520,887 — — — 520,887 — 1,056 Total commercial 21,298,184 57,702 88,478 146,180 21,444,364 8,011 105,360 Commercial real estate: Construction and land development 1,972,206 2,711 11,491 14,202 1,986,408 92 12,481 Term 8,082,940 14,415 29,245 43,660 8,126,600 19,700 13,787 Total commercial real estate 10,055,146 17,126 40,736 57,862 10,113,008 19,792 26,268 Consumer: Home equity credit line 2,309,967 4,503 6,680 11,183 2,321,150 1 1,779 1-4 family residential 5,163,610 12,416 24,856 37,272 5,200,882 318 20,599 Construction and other consumer real estate 359,723 9,675 1,144 10,819 370,542 160 608 Bankcard and other revolving plans 397,882 2,425 1,045 3,470 401,352 946 80 Other 211,560 644 156 800 212,360 — 84 Total consumer loans 8,442,742 29,663 33,881 63,544 8,506,286 1,425 23,150 Total $ 39,796,072 $ 104,491 $ 163,095 $ 267,586 $ 40,063,658 $ 29,228 $ 154,778 1 Represents nonaccrual loans not past due more than 30 days; however, full payment of principal and interest is still not expected.
Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators	December 31, 2015 (In thousands) Pass Special mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 12,007,076 $ 399,847 $ 804,403 $ 155 $ 13,211,481 Leasing 411,131 5,166 25,369 — 441,666 Owner occupied 6,720,052 139,784 290,192 — 7,150,028 Municipal 663,903 — 11,936 — 675,839 Total commercial 19,802,162 544,797 1,131,900 155 21,479,014 $ 454,277 Commercial real estate: Construction and land development 1,786,610 42,348 12,544 — 1,841,502 Term 8,319,348 47,245 139,036 8,772 8,514,401 Total commercial real estate 10,105,958 89,593 151,580 8,772 10,355,903 113,992 Consumer: Home equity credit line 2,404,635 — 11,722 — 2,416,357 1-4 family residential 5,325,519 — 56,580 — 5,382,099 Construction and other consumer real estate 381,738 — 3,502 — 385,240 Bankcard and other revolving plans 440,282 — 3,498 — 443,780 Other 186,836 — 313 — 187,149 Total consumer loans 8,739,010 — 75,615 — 8,814,625 37,779 Total $ 38,647,130 $ 634,390 $ 1,359,095 $ 8,927 $ 40,649,542 $ 606,048 December 31, 2014 (In thousands) Pass Special mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 12,515,846 $ 209,215 $ 426,002 $ 11,892 $ 13,162,955 Leasing 399,032 4,868 5,074 — 408,974 Owner occupied 6,844,310 168,423 338,815 — 7,351,548 Municipal 518,513 1,318 1,056 — 520,887 Total commercial 20,277,701 383,824 770,947 11,892 21,444,364 $ 412,514 Commercial real estate: Construction and land development 1,925,685 8,464 52,259 — 1,986,408 Term 7,802,571 96,347 223,324 4,358 8,126,600 Total commercial real estate 9,728,256 104,811 275,583 4,358 10,113,008 145,009 Consumer: Home equity credit line 2,304,352 — 16,798 — 2,321,150 1-4 family residential 5,138,660 — 62,222 — 5,200,882 Construction and other consumer real estate 367,932 — 2,610 — 370,542 Bankcard and other revolving plans 399,446 — 1,906 — 401,352 Other 211,811 — 549 — 212,360 Total consumer loans 8,422,201 — 84,085 — 8,506,286 47,140 Total $ 38,428,158 $ 488,635 $ 1,130,615 $ 16,250 $ 40,063,658 $ 604,663
Summary Of Information On Impaired Loans	December 31, 2015 Year Ended (In thousands) Unpaid principal balance Recorded investment Total recorded investment Related allowance Average recorded investment Interest with no allowance with allowance Commercial: Commercial and industrial $ 272,161 $ 44,190 $ 163,729 $ 207,919 $ 30,538 $ 153,756 $ 7,506 Owner occupied 141,526 83,024 43,243 126,267 5,486 125,777 12,450 Municipal 1,430 951 — 951 — 994 — Total commercial 415,117 128,165 206,972 335,137 36,024 280,527 19,956 Commercial real estate: Construction and land development 22,791 5,076 9,558 14,634 618 16,192 6,410 Term 142,239 82,864 34,361 117,225 2,604 111,074 16,971 Total commercial real estate 165,030 87,940 43,919 131,859 3,222 127,266 23,381 Consumer: Home equity credit line 27,064 18,980 5,319 24,299 243 22,050 1,547 1-4 family residential 74,009 29,540 41,155 70,695 8,736 96,482 2,616 Construction and other consumer real estate 2,741 989 1,014 2,003 173 2,288 123 Bankcard and other revolving plans — — — — — 1 102 Other 3,187 36 2,570 2,606 299 3,781 838 Total consumer loans 107,001 49,545 50,058 99,603 9,451 124,602 5,226 Total $ 687,148 $ 265,650 $ 300,949 $ 566,599 $ 48,697 $ 532,395 $ 48,563 December 31, 2014 Year Ended (In thousands) Unpaid principal balance Recorded investment Total recorded investment Related allowance Average recorded investment Interest with no allowance with allowance Commercial: Commercial and industrial $ 185,520 $ 43,257 $ 103,565 $ 146,822 $ 22,852 $ 185,947 $ 10,803 Owner occupied 198,231 83,179 86,382 169,561 6,087 233,361 18,221 Municipal 1,535 1,056 — 1,056 — 9,208 — Total commercial 385,286 127,492 189,947 317,439 28,939 428,516 29,024 Commercial real estate: Construction and land development 60,993 16,500 26,977 43,477 1,773 61,068 6,384 Term 203,788 96,351 63,740 160,091 2,345 238,507 31,144 Total commercial real estate 264,781 112,851 90,717 203,568 4,118 299,575 37,528 Consumer: Home equity credit line 30,209 14,798 11,883 26,681 437 25,909 2,426 1-4 family residential 86,575 37,096 35,831 72,927 8,494 81,526 2,058 Construction and other consumer real estate 3,902 1,449 1,410 2,859 233 3,167 155 Bankcard and other revolving plans — — — — — 2 22 Other 6,580 — 5,254 5,254 133 7,585 1,665 Total consumer loans 127,266 53,343 54,378 107,721 9,297 118,189 6,326 Total $ 777,333 $ 293,686 $ 335,042 $ 628,728 $ 42,354 $ 846,280 $ 72,878
Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type	December 31, 2015 Recorded investment resulting from the following modification types: (In thousands) Interest rate below market Maturity or term extension Principal forgiveness Payment deferral Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ 202 $ 3,236 $ 13 $ 100 $ 23,207 $ 34,473 $ 61,231 Owner occupied 1,999 681 929 — 9,879 16,339 29,827 Total commercial 2,201 3,917 942 100 33,086 50,812 91,058 Commercial real estate: Construction and land development 94 — — — — 9,698 9,792 Term 4,696 638 166 976 2,249 20,833 29,558 Total commercial real estate 4,790 638 166 976 2,249 30,531 39,350 Consumer: Home equity credit line 192 2,147 9,763 — 164 3,155 15,421 1-4 family residential 2,669 353 6,747 433 3,440 32,903 46,545 Construction and other consumer real estate 174 384 — — — 1,152 1,710 Total consumer loans 3,035 2,884 16,510 433 3,604 37,210 63,676 Total accruing 10,026 7,439 17,618 1,509 38,939 118,553 194,084 Nonaccruing Commercial: Commercial and industrial 28 455 — 1,879 3,577 49,617 55,556 Owner occupied 685 1,669 — 724 34 16,335 19,447 Municipal — 951 — — — — 951 Total commercial 713 3,075 — 2,603 3,611 65,952 75,954 Commercial real estate: Construction and land development — 333 — — 3,156 208 3,697 Term 1,844 — — — 2,960 5,203 10,007 Total commercial real estate 1,844 333 — — 6,116 5,411 13,704 Consumer: Home equity credit line 7 500 1,400 54 — 233 2,194 1-4 family residential — 275 2,052 136 1,180 7,299 10,942 Construction and other consumer real estate — 101 17 48 — 44 210 Bankcard and other revolving plans — — — — — — — Total consumer loans 7 876 3,469 238 1,180 7,576 13,346 Total nonaccruing 2,564 4,284 3,469 2,841 10,907 78,939 103,004 Total $ 12,590 $ 11,723 $ 21,087 $ 4,350 $ 49,846 $ 197,492 $ 297,088 December 31, 2014 Recorded investment resulting from the following modification types: (In thousands) Interest rate below market Maturity or term extension Principal forgiveness Payment deferral Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ 2,611 $ 6,509 $ 18 $ 3,203 $ 3,855 $ 34,585 $ 50,781 Owner occupied 19,981 1,124 960 1,251 10,960 17,505 51,781 Total commercial 22,592 7,633 978 4,454 14,815 52,090 102,562 Commercial real estate: Construction and land development — — — — 521 19,854 20,375 Term 7,328 9,027 179 3,153 2,546 39,007 61,240 Total commercial real estate 7,328 9,027 179 3,153 3,067 58,861 81,615 Consumer: Home equity credit line 742 70 11,320 — 166 1,281 13,579 1-4 family residential 2,425 552 6,828 446 753 34,719 45,723 Construction and other consumer real estate 290 422 42 90 — 1,227 2,071 Total consumer loans 3,457 1,044 18,190 536 919 37,227 61,373 Total accruing 33,377 17,704 19,347 8,143 18,801 148,178 245,550 Nonaccruing Commercial: Commercial and industrial 442 576 — 611 5,199 20,410 27,238 Owner occupied 2,714 1,219 — 883 2,852 12,040 19,708 Municipal — 1,056 — — — — 1,056 Total commercial 3,156 2,851 — 1,494 8,051 32,450 48,002 Commercial real estate: Construction and land development 11,080 68 — 93 3,300 6,427 20,968 Term 2,851 — — — 277 4,607 7,735 Total commercial real estate 13,931 68 — 93 3,577 11,034 28,703 Consumer: Home equity credit line — — 420 203 — 399 1,022 1-4 family residential 3,378 1,029 1,951 191 3,527 9,413 19,489 Construction and other consumer real estate — 463 — — — 100 563 Total consumer loans 3,378 1,492 2,371 394 3,527 9,912 21,074 Total nonaccruing 20,465 4,411 2,371 1,981 15,155 53,396 97,779 Total $ 53,842 $ 22,115 $ 21,718 $ 10,124 $ 33,956 $ 201,574 $ 343,329 1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc. 2 Includes TDRs that resulted from a combination of any of the previous modification types.
Schedule Of Net Financial Impact On Interest Income Due To Interest Rate Modifications Below Market For Accruing TDR Loans	(In thousands) 2015 2014 Commercial: Commercial and industrial $ (261 ) $ (84 ) Owner occupied (279 ) (519 ) Total commercial (540 ) (603 ) Commercial real estate: Construction and land development (90 ) (197 ) Term (378 ) (573 ) Total commercial real estate (468 ) (770 ) Consumer: Home equity credit line (2 ) (5 ) 1-4 family residential (1,037 ) (1,130 ) Construction and other consumer real estate (27 ) (32 ) Total consumer loans (1,066 ) (1,167 ) Total decrease to interest income 1 $ (2,074 ) $ (2,540 ) 1 Calculated based on the difference between the modified rate and the premodified rate applied to the recorded investment.
Schedule Of Investment Of Accruing And Nonaccruing Loans Modified As Troubled Debt Restructurings	(In thousands) December 31, 2015 December 31, 2014 Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ 883 $ 116 $ 999 $ — $ 1,008 $ 1,008 Owner occupied — 1,684 1,684 — 378 378 Total commercial 883 1,800 2,683 — 1,386 1,386 Commercial real estate: Construction and land development — — — — — — Term — — — — — — Total commercial real estate — — — — — — Consumer: Home equity credit line — — — — 201 201 1-4 family residential — 722 722 192 310 502 Construction and other consumer real estate — — — — 55 55 Total consumer loans — 722 722 192 566 758 Total $ 883 $ 2,522 $ 3,405 $ 192 $ 1,952 $ 2,144 Note: Total loans modified as TDRs during the 12 months previous to December 31, 2015 and 2014 were $134.0 million and $84.7 million , respectively.
Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans	December 31, (In thousands) 2015 2014 Commercial $ 72,440 $ 104,942 Commercial real estate 65,167 118,217 Consumer 11,082 17,910 Outstanding balance $ 148,689 $ 241,069 Carrying amount $ 125,029 $ 179,299 Less ALLL 945 2,800 Carrying amount, net $ 124,084 $ 176,499
Schedule Of Changes In The Accretable Yield For PCI Loans	(In thousands) 2015 2014 Balance at beginning of year $ 45,055 $ 77,528 Accretion (40,077 ) (58,140 ) Reclassification from nonaccretable difference 22,190 17,647 Disposals and other 12,635 8,020 Balance at end of year $ 39,803 $ 45,055

Derivative Instruments And He37

Derivative Instruments And Hedging Activities Amount of Derivative Gain/Loss Recognized/Reclassified (Tables)	12 Months Ended
	Dec. 31, 2015
Summary of Derivative Instruments [Abstract]
Schedule of Derivative Instruments	December 31, 2015 December 31, 2014 Notional amount Fair value Notional amount Fair value (In thousands) Other assets Other liabilities Other assets Other liabilities Derivatives designated as hedging instruments Cash flow hedges: 1 Interest rate swaps $ 1,387,500 $ 5,461 $ 956 $ 275,000 $ 1,508 $ 123 Total derivatives designated as hedging instruments 1,387,500 5,461 956 275,000 1,508 123 Derivatives not designated as hedging instruments Interest rate swaps 40,314 — 8 — — — Interest rate swaps for customers 2 3,256,190 51,353 53,843 2,770,052 48,287 50,669 Foreign exchange 463,064 20,824 17,761 443,721 16,625 15,272 Total derivatives not designated as hedging instruments 3,759,568 72,177 71,612 3,213,773 64,912 65,941 Total derivatives $ 5,147,068 $ 77,638 $ 72,568 $ 3,488,773 $ 66,420 $ 66,064
Schedule Of Gain (Loss) Of Derivative Instruments	Year Ended December 31, 2015 Year Ended December 31, 2014 Amount of derivative gain (loss) recognized/reclassified (In thousands) OCI Reclassified from AOCI to interest income Noninterest income (expense) Offset to interest expense OCI Reclassified from AOCI to interest income Noninterest income (expense) Offset to interest expense Derivatives designated as hedging instruments Cash flow hedges: 1 Interest rate swaps $ 12,124 $ 9,004 $ 4,361 $ 2,594 12,124 9,004 3 4,361 2,594 3 Fair value hedges: Terminated swaps on long-term debt $ 1,504 $ 2,309 Total derivatives designated as hedging instruments 12,124 9,004 1,504 4,361 2,594 2,309 Derivatives not designated as hedging instruments Interest rate swaps $ — $ 355 Interest rate swaps for customers 2 7,438 467 Futures contracts 2 — Foreign exchange 9,519 8,344 Total return swap — (7,894 ) Total derivatives not designated as hedging instruments 16,959 1,272 Total derivatives $ 12,124 $ 9,004 $ 16,959 $ 1,504 $ 4,361 $ 2,594 $ 1,272 $ 2,309 Note: These schedules are not intended to present at any given time the Company’s long/short position with respect to its derivative contracts. 1 Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). 2 Amounts include both the customer swaps and the offsetting derivative contracts. 3 Amounts of $9.0 million for 2015 and $2.6 million for 2014 are the amounts of reclassification to earnings presented in the tabular changes of AOCI in Note 13.

Goodwill And Other Intangible38

Goodwill And Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortizing Intangible Assets	Gross carrying amount Accumulated amortization Net carrying amount (In thousands) 2015 2014 2015 2014 2015 2014 Core deposit intangibles $ 166,518 $ 170,688 $ (151,157 ) $ (146,842 ) $ 15,361 $ 23,846 Customer relationships and other intangibles 28,014 28,014 (27,103 ) (26,340 ) 911 1,674 Total $ 194,532 $ 198,702 $ (178,260 ) $ (173,182 ) $ 16,272 $ 25,520
Schedule Of Estimated Amortization Expense	(In thousands) 2016 $ 7,888 2017 6,369 2018 1,556 2019 459 2020 —
Schedule Of Goodwill	(In thousands) Zions Bank CB&T Amegy Consolidated Company Balance at December 31, 2013 $ 19,514 $ 379,024 $ 615,591 $ 1,014,129 Impairment losses — — — — Balance at December 31, 2014 19,514 379,024 615,591 1,014,129 Impairment losses — — — — Balance at December 31, 2015 $ 19,514 $ 379,024 $ 615,591 $ 1,014,129

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2015
Deposits [Abstract]
Deposit Liabilities Disclosures [Text Block]	10. DEPOSITS At December 31, 2015 , the scheduled maturities of all time deposits were as follows: (In thousands) 2016 $ 1,667,431 2017 248,709 2018 128,548 2019 86,471 2020 110,674 Thereafter 973 Total $ 2,242,806 At December 31, 2015 , the contractual maturities of domestic time deposits with a denomination of $100,000 and over were as follows: $334 million in 3 months or less, $219 million over 3 months through 6 months, $278 million over 6 months through 12 months, and $300 million over 12 months. Domestic time deposits in denominations that meet or exceed the current FDIC insurance limit of $250,000 were $584 million and $657 million at December 31, 2015 and 2014 , respectively. Domestic time deposits under $250,000 were $1.5 billion and $1.7 billion at December 31, 2015 and 2014 , respectively. Foreign time deposits $250,000 and over were $112 million and $135 million at December 31, 2015 and 2014 , respectively. Deposit overdrafts reclassified as loan balances were $14 million and $15 million at December 31, 2015 and 2014 , respectively.
Maturity of All Time Deposits [Table Text Block]	(In thousands) 2016 $ 1,667,431 2017 248,709 2018 128,548 2019 86,471 2020 110,674 Thereafter 973 Total $ 2,242,806

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Short-term Debt [Line Items]
Summary Of Short-Term Borrowings	Selected information for federal funds and other short-term borrowings is as follows: (Amounts in thousands) 2015 2014 2013 Federal funds purchased Average amount outstanding $ 105,910 $ 104,358 $ 150,217 Weighted average rate 0.18 % 0.17 % 0.15 % Highest month-end balance 122,461 124,093 206,450 Year-end balance 111,263 100,193 129,131 Weighted average rate on outstandings at year-end 0.25 % 0.15 % 0.14 % Security repurchase agreements Average amount outstanding 127,358 116,190 124,929 Weighted average rate 0.11 % 0.06 % 0.05 % Highest month-end balance 205,566 156,710 137,611 Year-end balance 205,566 118,600 137,611 Weighted average rate on outstandings at year-end 0.15 % 0.13 % 0.05 % Other short-term borrowings , year-end balances Securities sold, not yet purchased 30,158 24,230 73,606 Other — 1,200 — Total federal funds and other short-term borrowings $ 346,987 $ 244,223 $ 340,348

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Instrument [Line Items]
Schedule of Maturities of Long-term Debt [Table Text Block]	(In thousands) Consolidated Parent only 2016 $ 88,382 $ 88,210 2017 161,147 160,951 2018 11,332 11,107 2019 259 — 2020 60 — Thereafter 556,168 556,168 Total $ 817,348 $ 816,436
Schedule Of Long-Term Debt	December 31, (In thousands) 2015 2014 Junior subordinated debentures related to trust preferred securities $ 164,950 $ 168,043 Convertible subordinated notes — 132,838 Subordinated notes 249,891 335,798 Senior notes 401,595 432,385 FHLB advances — 22,156 Capital lease obligations 912 1,062 Total $ 817,348 $ 1,092,282
Schedule Of Trust Preferred Securities	(Amounts in thousands) Balance Coupon rate 1 Maturity Amegy Statutory Trust I $ 51,547 3mL+2.85% (3.38%) Dec 2033 Amegy Statutory Trust II 36,083 3mL+1.90% (2.22%) Oct 2034 Amegy Statutory Trust III 61,856 3mL+1.78% (2.29%) Dec 2034 Stockmen’s Statutory Trust II 7,732 3mL+3.15% (3.75%) Mar 2033 Stockmen’s Statutory Trust III 7,732 3mL+2.89% (3.42%) Mar 2034 Total $ 164,950
Schedule Of Subordinated Notes	(Amounts in thousands) Subordinated notes Coupon rate Balance Par amount Maturity 5.65% $ 162,000 $ 162,000 Nov 2023 6.95% 87,891 87,891 Sep 2028 Total $ 249,891 $ 249,891
Schedule Of Senior Medium-Term Notes	(Amounts in thousands) Senior notes Coupon rate Balance Par amount Maturity 4.00% $ 88,210 $ 89,360 Jun 2016 4.50% 160,950 163,857 Mar 2017 4.50% 141,328 145,231 Jun 2023 3.60% 11,107 11,108 July 2018 Total $ 401,595 $ 409,556
Debt Redemptions and Repurchases	(Amounts in thousands) 2015 2014 Note type Coupon rate Par amount Coupon rate Par amount Trust preferred 3mL + 2.85% $ 3,093 Convertible subordinated notes 5.65 % $ 75,674 6.00 % 79,276 5.50 % 71,592 150,868 75,674 Subordinated notes 5.65 % 30,173 3mL+1.25% 75,000 6.00 % 32,366 5.50 % 52,078 84,444 105,173 Senior notes 7.75 % 240,769 4.0%, 4.5% 499,980 3.50 % 50,000 2.55% - 5.50% 247,512 3.30% - 3.70% 27,281 27,281 1,038,261 FHLB Advances 22,009 Total $ 287,695 $ 1,219,108
Schedule Of Maturities On Long-Term Debt	Senior Notes: Coupon rate Maturity 3.60% Jul 2018

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2015
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Summary Of Preferred Stock	Preferred stock is summarized as follows: (Amounts in thousands except share amounts) Carrying value at Shares at Dividends payable Earliest redemption date Rate following earliest redemption date Dividends payable after rate change 2015 2014 Authorized Outstanding Rate (when applicable) Series A $ 66,316 $ 66,168 140,000 66,139 > of 4.0% or 3mL+0.52% Qtrly Mar,Jun,Sep,Dec Dec 15, 2011 Series F 143,750 143,750 250,000 143,750 7.9% Qtrly Mar,Jun,Sep,Dec Jun 15, 2017 Series G 171,827 171,827 200,000 171,827 6.3% Qtrly Mar,Jun,Sep,Dec Mar 15, 2023 annual float-ing rate = 3mL+4.24% Series H 126,221 126,221 126,221 126,221 5.75% Qtrly Mar,Jun,Sep,Dec Jun 15, 2019 Series I 125,224 300,893 300,893 125,224 5.8% Semi-annually Jun,Dec Jun 15, 2023 annual float-ing rate = 3mL+3.8% Qtrly Mar,Jun,Sep,Dec Series J 195,152 195,152 195,152 195,152 7.2% Semi-annually Mar,Sep Sep 15, 2023 annual float-ing rate = 3mL+4.44% Qtrly Mar,Jun,Sep,Dec Total $ 828,490 $ 1,004,011
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Statement of Income (SI) Balance Sheet (BS) (In thousands) Amounts reclassified from AOCI 1 Details about AOCI components 2015 2014 2013 Affected line item Net realized gains (losses) on investment securities $ (138,735 ) $ 10,419 $ (2,898 ) SI Fixed income securities gains (losses), net Income tax expense (benefit) (52,712 ) 3,971 (1,123 ) (86,023 ) 6,448 (1,775 ) Net unrealized losses on investment securities — (27 ) (164,732 ) SI Net impairment losses on investment securities Income tax benefit — (10 ) (64,829 ) — (17 ) (99,903 ) Accretion of securities with noncredit-related impairment losses not expected to be sold — (1,878 ) (2,106 ) BS Investment securities, held-to-maturity Deferred income taxes — 767 848 BS Other assets $ (86,023 ) $ 5,320 $ (102,936 ) Net unrealized gains on derivative instruments $ 9,004 $ 2,594 $ 2,647 SI Interest and fees on loans Income tax expense 3,421 989 1,067 $ 5,583 $ 1,605 $ 1,580 Amortization of net actuarial loss $ (5,996 ) $ (2,843 ) $ (8,127 ) SI Salaries and employee benefits Amortization of prior service credit (cost) — (50 ) 27 SI Salaries and employee benefits Income tax benefit (2,278 ) (1,103 ) (3,194 ) $ (3,718 ) $ (1,790 ) $ (4,906 ) 1 Negative reclassification amounts indicate decreases to earnings in the statement of income and increases to balance sheet assets. The opposite applies to positive reclassification amounts.
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	Changes in AOCI by component are as follows: (In thousands) Net unrealized gains (losses) on investment securities Net unrealized gains (losses) on derivatives and other Pension and post-retirement Total 2015 Balance at December 31, 2014 $ (91,921 ) $ 2,226 $ (38,346 ) $ (128,041 ) Other comprehensive income (loss) before reclassifications, net of tax (12,471 ) 4,903 (3,161 ) (10,729 ) Amounts reclassified from AOCI, net of tax 86,023 (5,583 ) 3,718 84,158 Other comprehensive income (loss) 73,552 (680 ) 557 73,429 Balance at December 31, 2015 $ (18,369 ) $ 1,546 $ (37,789 ) $ (54,612 ) Income tax expense (benefit) included in other comprehensive income (loss) $ 48,422 $ (331 ) $ 374 $ 48,465 2014 Balance at December 31, 2013 $ (168,805 ) $ 1,556 $ (24,852 ) $ (192,101 ) Other comprehensive income (loss) before reclassifications, net of tax 82,204 2,275 (15,284 ) 69,195 Amounts reclassified from AOCI, net of tax (5,320 ) (1,605 ) 1,790 (5,135 ) Other comprehensive income (loss) 76,884 670 (13,494 ) 64,060 Balance at December 31, 2014 $ (91,921 ) $ 2,226 $ (38,346 ) $ (128,041 ) Income tax expense (benefit) included in other comprehensive income (loss) $ 60,795 $ 467 $ (8,764 ) $ 52,498
Shareholders' Equity	13. SHAREHOLDERS’ EQUITY Preferred Stock Preferred stock is without par value and has a liquidation preference of $1,000 per share, or $25 per depositary share. Except for Series I and J, all preferred shares were issued in the form of depositary shares, with each depositary share representing a 1/40 th ownership interest in a share of the preferred stock. All preferred shares are registered with the SEC. In general, preferred shareholders may receive asset distributions before common shareholders; however, preferred shareholders have only limited voting rights generally with respect to certain provisions of the preferred stock, the issuance of senior preferred stock, and the election of directors. Preferred stock dividends reduce earnings available to common shareholders and are paid on the 15th day of the months indicated in the following schedule. Dividends are approved by the Board of Directors and are subject to regulatory non-objection to a stress test and capital plan submitted to the Federal Reserve pursuant to the annual Comprehensive Capital Analysis and Review (“CCAR”) process. Redemption of the preferred stock is at the Company’s option after the expiration of any applicable redemption restrictions. The redemption amount is computed at the per share liquidation preference plus any declared but unpaid dividends. Redemptions are subject to certain regulatory provisions, including the previously noted capital plan non-objection for a submitted capital plan in a given year. Preferred stock is summarized as follows: (Amounts in thousands except share amounts) Carrying value at Shares at Dividends payable Earliest redemption date Rate following earliest redemption date Dividends payable after rate change 2015 2014 Authorized Outstanding Rate (when applicable) Series A $ 66,316 $ 66,168 140,000 66,139 > of 4.0% or 3mL+0.52% Qtrly Mar,Jun,Sep,Dec Dec 15, 2011 Series F 143,750 143,750 250,000 143,750 7.9% Qtrly Mar,Jun,Sep,Dec Jun 15, 2017 Series G 171,827 171,827 200,000 171,827 6.3% Qtrly Mar,Jun,Sep,Dec Mar 15, 2023 annual float-ing rate = 3mL+4.24% Series H 126,221 126,221 126,221 126,221 5.75% Qtrly Mar,Jun,Sep,Dec Jun 15, 2019 Series I 125,224 300,893 300,893 125,224 5.8% Semi-annually Jun,Dec Jun 15, 2023 annual float-ing rate = 3mL+3.8% Qtrly Mar,Jun,Sep,Dec Series J 195,152 195,152 195,152 195,152 7.2% Semi-annually Mar,Sep Sep 15, 2023 annual float-ing rate = 3mL+4.44% Qtrly Mar,Jun,Sep,Dec Total $ 828,490 $ 1,004,011 Preferred Stock Redemptions Effective November 18, 2015, we redeemed approximately $175.7 million of Series I preferred stock through a cash tender offer. The offer amount of $180 million , or $24.65 per share, differed from the redemption amount by approximately $4.3 million of accrued dividends. The size and terms of the offer were determined in accordance with the Company’s 2015 capital plan. In September 2013, we redeemed all of the outstanding $800 million par amount of Series C preferred stock through the issuance of an aggregate equivalent amount of other series of preferred stock. The reduction of $926 million carrying value in preferred stock differed from the par amount by $126 million , which was the intrinsic value of the beneficial conversion feature (“BCF”) associated with the convertible subordinated debt. The BCF had been accumulating as the convertible subordinated debt was converted to the Series C preferred stock. The $126 million BCF transfer was recorded as a preferred stock redemption in the 2013 statement of income. As shown in Note 12, the remaining convertible subordinated debt matured during 2015. Common Stock In July 2014 , we issued $525 million of common stock, which consisted of approximately 17.6 million shares at a price of $29.80 per share. Net of commissions and fees, this issuance added approximately $516 million to common stock and was permitted under the Company’s resubmitted capital plan. Common Stock Warrants We have 5.8 million common stock warrants at an exercise price of $36.27 per share which expire November 14, 2018 . These warrants were associated with the preferred stock issued under the Troubled Asset Relief Program (“TARP”) which was redeemed in 2012. In addition, we have issued a total of 29.3 million common stock warrants which can be exercised at a price of $36.14 as of December 31, 2015 through May 22, 2020. Accumulated Other Comprehensive Income Changes in AOCI by component are as follows: (In thousands) Net unrealized gains (losses) on investment securities Net unrealized gains (losses) on derivatives and other Pension and post-retirement Total 2015 Balance at December 31, 2014 $ (91,921 ) $ 2,226 $ (38,346 ) $ (128,041 ) Other comprehensive income (loss) before reclassifications, net of tax (12,471 ) 4,903 (3,161 ) (10,729 ) Amounts reclassified from AOCI, net of tax 86,023 (5,583 ) 3,718 84,158 Other comprehensive income (loss) 73,552 (680 ) 557 73,429 Balance at December 31, 2015 $ (18,369 ) $ 1,546 $ (37,789 ) $ (54,612 ) Income tax expense (benefit) included in other comprehensive income (loss) $ 48,422 $ (331 ) $ 374 $ 48,465 2014 Balance at December 31, 2013 $ (168,805 ) $ 1,556 $ (24,852 ) $ (192,101 ) Other comprehensive income (loss) before reclassifications, net of tax 82,204 2,275 (15,284 ) 69,195 Amounts reclassified from AOCI, net of tax (5,320 ) (1,605 ) 1,790 (5,135 ) Other comprehensive income (loss) 76,884 670 (13,494 ) 64,060 Balance at December 31, 2014 $ (91,921 ) $ 2,226 $ (38,346 ) $ (128,041 ) Income tax expense (benefit) included in other comprehensive income (loss) $ 60,795 $ 467 $ (8,764 ) $ 52,498 Statement of Income (SI) Balance Sheet (BS) (In thousands) Amounts reclassified from AOCI 1 Details about AOCI components 2015 2014 2013 Affected line item Net realized gains (losses) on investment securities $ (138,735 ) $ 10,419 $ (2,898 ) SI Fixed income securities gains (losses), net Income tax expense (benefit) (52,712 ) 3,971 (1,123 ) (86,023 ) 6,448 (1,775 ) Net unrealized losses on investment securities — (27 ) (164,732 ) SI Net impairment losses on investment securities Income tax benefit — (10 ) (64,829 ) — (17 ) (99,903 ) Accretion of securities with noncredit-related impairment losses not expected to be sold — (1,878 ) (2,106 ) BS Investment securities, held-to-maturity Deferred income taxes — 767 848 BS Other assets $ (86,023 ) $ 5,320 $ (102,936 ) Net unrealized gains on derivative instruments $ 9,004 $ 2,594 $ 2,647 SI Interest and fees on loans Income tax expense 3,421 989 1,067 $ 5,583 $ 1,605 $ 1,580 Amortization of net actuarial loss $ (5,996 ) $ (2,843 ) $ (8,127 ) SI Salaries and employee benefits Amortization of prior service credit (cost) — (50 ) 27 SI Salaries and employee benefits Income tax benefit (2,278 ) (1,103 ) (3,194 ) $ (3,718 ) $ (1,790 ) $ (4,906 ) 1 Negative reclassification amounts indicate decreases to earnings in the statement of income and increases to balance sheet assets. The opposite applies to positive reclassification amounts. Deferred Compensation Deferred compensation consists of invested assets, including the Company’s common stock, which are held in rabbi trusts for certain employees and directors. At December 31, 2015 and 2014 , the cost of the common stock included in retained earnings was approximately $15.2 million and $14.3 million , respectively. We consolidate the fair value of invested assets of the trusts along with the total obligations and include them in other assets and other liabilities, respectively, in the balance sheet. At December 31, 2015 and 2014 , total invested assets were approximately $81.8 million and $86.6 million and total obligations were approximately $96.9 million and $100.9 million , respectively. Noncontrolling Interests In 2013, we removed the entire noncontrolling interest amount of approximately $4.8 million from the Company’s balance sheet following settlement with the remaining owner.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Schedule Of Income Taxes (Benefit)	(In thousands) 2015 2014 2013 Federal: Current $ 158,164 $ 178,450 $ 173,418 Deferred (31,843 ) 14,277 (51,475 ) 126,321 192,727 121,943 State: Current 14,027 18,573 29,676 Deferred 2,040 11,661 (8,642 ) 16,067 30,234 21,034 $ 142,388 $ 222,961 $ 142,977
Schedule Of Statutory Federal Income Tax Rate Reconciles To Actual Income Tax Expense (Benefit)	(In thousands) 2015 2014 2013 Income tax expense at statutory federal rate $ 158,151 $ 217,498 $ 142,251 State income taxes including credits, net 10,443 19,652 13,672 Other nondeductible expenses 3,205 2,949 2,574 Nontaxable income (20,397 ) (17,869 ) (17,071 ) Tax credits and other taxes (2,926 ) (1,717 ) (2,628 ) Other (6,088 ) 2,448 4,179 $ 142,388 $ 222,961 $ 142,977
Schedule Of Tax Effects Of Deferred Tax Assets And Deferred Tax Liabilities	(In thousands) December 31, 2015 2014 Gross deferred tax assets: Book loan loss deduction in excess of tax $ 254,223 $ 258,488 Pension and postretirement 24,749 25,142 Deferred compensation 91,665 93,023 Security investments and derivative fair value adjustments 11,254 22,440 Net operating losses, capital losses and tax credits 4,659 5,442 FDIC-supported transactions 9,157 15,636 Other 46,016 46,521 441,723 466,692 Valuation allowance (4,261 ) (4,261 ) Total deferred tax assets 437,462 462,431 Gross deferred tax liabilities: Core deposits and purchase accounting (3,392 ) (6,559 ) Premises and equipment, due to differences in depreciation (10,588 ) (10,361 ) FHLB stock dividends (10,042 ) (12,376 ) Leasing operations (85,255 ) (76,148 ) Prepaid expenses (9,001 ) (9,337 ) Prepaid pension reserves (18,087 ) (18,491 ) Mortgage servicing (6,845 ) (5,834 ) Subordinated debt modification (46,451 ) (64,030 ) Deferred loan fees (23,723 ) (22,774 ) Equity investments (21,037 ) (12,262 ) Total deferred tax liabilities (234,421 ) (238,172 ) Net deferred tax assets $ 203,041 $ 224,259
Schedule Of Reconciliation Of Gross Unrecognized Tax Benefits	(In thousands) 2015 2014 2013 Balance at beginning of year $ 3,255 $ 2,385 $ 2,385 Tax positions related to current year: Additions 786 — — Reductions — — — Tax positions related to prior years: Additions 1,407 870 — Reductions — — — Settlements with taxing authorities — — — Lapses in statutes of limitations — — — Balance at end of year $ 5,448 $ 3,255 $ 2,385

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2015
Share-based Compensation [Abstract]
Compensation Expense And Related Tax Benefit For All Share-Based Awards	(In thousands) 2015 2014 2013 Compensation expense $ 24,974 $ 23,632 $ 28,052 Reduction of income tax expense 8,284 7,767 9,123
Summary Of Stock Option Activity	Number of shares Weighted average exercise price Balance at December 31, 2012 5,962,325 $ 38.87 Granted 1,047,781 27.41 Exercised (488,479 ) 20.11 Expired (574,157 ) 70.12 Forfeited (72,880 ) 22.25 Balance at December 31, 2013 5,874,590 35.54 Granted 947,758 28.67 Exercised (489,905 ) 21.60 Expired (618,207 ) 73.28 Forfeited (83,734 ) 25.72 Balance at December 31, 2014 5,630,502 31.60 Granted 740,300 29.01 Exercised (1,165,287 ) 25.11 Expired (1,322,067 ) 48.44 Forfeited (79,353 ) 28.09 Balance at December 31, 2015 3,804,095 27.30 Outstanding stock options exercisable as of: December 31, 2015 2,187,259 $ 26.35 December 31, 2014 3,804,873 33.86 December 31, 2013 4,101,928 40.40

Commitments, Guarantees, Cont45

Commitments, Guarantees, Contingent Liabilities, and Related Parties Operating Leases, Future Aggregate Minimum Rental Payments (Tables) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Operating Leased Assets [Line Items]
Summary of Unfunded Commitments and Redemption [Table Text Block]	December 31, (In thousands) 2015 2014 Net unfunded commitments to extend credit 1 $ 17,169,785 $ 16,658,757 Standby letters of credit: Financial 661,554 745,895 Performance 216,843 183,482 Commercial letters of credit 18,447 32,144 Total unfunded lending commitments $ 18,066,629 $ 17,620,278
Operating Leases, Future Minimum Payments Due	$ 289,651
Operating Leases, Future Minimum Payments Due, Next Twelve Months	44,668
Operating Leases, Future Minimum Payments, Due in Two Years	43,730
Operating Leases, Future Minimum Payments, Due in Three Years	39,158
Operating Leases, Future Minimum Payments, Due in Four Years	32,524
Operating Leases, Future Minimum Payments, Due in Five Years	27,258
Operating Leases, Future Minimum Payments, Due Thereafter	$ 102,313

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2015
Regulatory Capital Requirements [Abstract]
Summary Of Actual Capital Amounts And Ratios For The Company And Its Three Largest Subsidiary Banks	December 31, 2015 To be well-capitalized (Amounts in thousands) Amount Ratio Amount Ratio Transitional Basis Basel III Regulatory Capital Rules Total capital (to risk-weighted assets) The Company $ 7,535,760 16.12 % $ 4,674,725 10.00 % ZB, National Association 6,918,312 14.84 4,661,581 10.00 Tier 1 capital (to risk-weighted assets) The Company 6,580,326 14.08 3,739,780 8.00 ZB, National Association 6,334,391 13.59 3,729,265 8.00 Common equity tier 1 capital (Basel III) The Company 5,711,836 12.22 3,038,571 6.50 ZB, National Association 5,503,491 11.81 3,030,028 6.50 Tier 1 capital (to average assets) The Company 6,580,326 11.26 na na 1 ZB, National Association 6,334,391 10.97 2,886,732 5.00 1 There is no Tier 1 leverage ratio component in the definition of a well-capitalized bank holding company . The actual capital amounts and ratios for the Company and its three largest subsidiary banks prior to the charter consolidation under Basel I are as follows: December 31, 2014 To be well-capitalized (Amounts in thousands) Amount Ratio Amount Ratio Basel I Regulatory Capital Rule Total capital (to risk-weighted assets) The Company $ 7,443,301 16.27 % $ 4,573,768 10.00 % Zions Bank 2,108,904 15.27 1,381,243 10.00 California Bank & Trust 1,286,095 14.18 906,915 10.00 Amegy Bank 1,741,586 14.09 1,236,244 10.00 Tier 1 capital (to risk-weighted assets) The Company 6,620,282 14.47 2,744,261 6.00 Zions Bank 1,942,856 14.07 828,746 6.00 California Bank & Trust 1,179,129 13.00 544,149 6.00 Amegy Bank 1,586,686 12.83 741,747 6.00 Tier 1 capital (to average assets) The Company 6,620,282 11.82 na na 1 Zions Bank 1,942,856 10.52 923,193 5.00 California Bank & Trust 1,179,129 10.78 547,086 5.00 Amegy Bank 1,586,686 11.79 672,996 5.00

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Retirement Plans, Unfunded Commitments and Redemption [Table Text Block]	Investment Unfunded commitments (in thousands, approximately) Redemption Frequency Notice period Pooled separate accounts na Daily < $1 million, 1 day >= $1 million, 3 days Limited partnerships $ 1,600 Investments in these limited partnerships are illiquid and voluntary withdrawal is prohibited.
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	2015 2014 Profit sharing expense $6,062 $12,034 Level 3 - significant input assumptions: 2015 2014 Composite market value factor: Minimum in range 0.995927 1.018148 Maximum in range 1.049539 1.081039 Actual at year end 1.04225 1.06313
Schedule Of Amounts In Accumulated Other Comprehensive Income (Loss) Expected To Be Recognized As An Expense Component Of Net Periodic Benefit Cost For The Plans	(In thousands) Pension Supplemental Retirement Postretirement Net gain (loss) $ (6,638 ) $ (117 ) $ 66
Schedule Of Weighted Average Assumptions Based On The Pension Plan	2015 2014 2013 Used to determine benefit obligation at year-end: Discount rate 4.20 % 3.95 % 4.60 % Rate of compensation increase 1 na na na Used to determine net periodic benefit cost for the years ended December 31: Discount rate 3.95 4.60 3.75 Expected long-term return on plan assets 7.50 8.00 8.00 Rate of compensation increase 1 na na 3.50

Retirement Plans Weighted avera

Retirement Plans Weighted average assumptions on pension plan (Tables)	12 Months Ended
	Dec. 31, 2015
Weighted average assumptions on pension plan [Abstract]
Schedule Of Weighted Average Assumptions Based On The Pension Plan	2015 2014 2013 Used to determine benefit obligation at year-end: Discount rate 4.20 % 3.95 % 4.60 % Rate of compensation increase 1 na na na Used to determine net periodic benefit cost for the years ended December 31: Discount rate 3.95 4.60 3.75 Expected long-term return on plan assets 7.50 8.00 8.00 Rate of compensation increase 1 na na 3.50

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis	(In thousands) December 31, 2015 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: U.S. Treasury, agencies and corporations $ — $ 7,100,844 $ — $ 7,100,844 Municipal securities 418,695 418,695 Other debt securities 22,941 22,941 Money market mutual funds and other 61,807 38,829 100,636 61,807 7,581,309 — 7,643,116 Trading account 48,168 48,168 Other noninterest-bearing investments: Bank-owned life insurance 485,978 485,978 Private equity investments 120,027 120,027 Other assets: Agriculture loan servicing and interest-only strips 13,514 13,514 Deferred compensation plan assets 84,570 84,570 Derivatives: Interest rate related and other 5,966 5,966 Interest rate swaps for customers 51,353 51,353 Foreign currency exchange contracts 20,824 20,824 20,824 57,319 78,143 $ 167,201 $ 8,172,774 $ 133,541 $ 8,473,516 LIABILITIES Securities sold, not yet purchased $ 30,158 $ — $ — $ 30,158 Other liabilities: Deferred compensation plan obligations 84,570 84,570 Derivatives: Interest rate related and other 835 835 Interest rate swaps for customers 53,843 53,843 Foreign currency exchange contracts 17,761 17,761 17,761 54,678 — 72,439 Other — $ 132,489 $ 54,678 $ — $ 187,167 (In thousands) December 31, 2014 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: U.S. Treasury, agencies and corporations $ — $ 3,098,208 $ — $ 3,098,208 Municipal securities 185,093 4,164 189,257 Asset-backed securities: Trust preferred – banks and insurance 22,701 393,007 415,708 Auction rate 4,761 4,761 Other 666 25 691 Money market mutual funds and other 105,348 30,275 135,623 105,348 3,336,943 401,957 3,844,248 Trading account 70,601 70,601 Other noninterest-bearing investments: Bank-owned life insurance 476,290 476,290 Private equity investments 97,649 97,649 Other assets: Agriculture loan servicing and interest-only strips 12,227 12,227 Deferred compensation plan assets 88,878 88,878 Derivatives: Interest rate related and other 1,508 1,508 Interest rate swaps for customers 48,287 48,287 Foreign currency exchange contracts 16,625 16,625 16,625 49,795 66,420 $ 210,851 $ 3,933,629 $ 511,833 $ 4,656,313 LIABILITIES Securities sold, not yet purchased $ 24,230 $ — $ — $ 24,230 Other liabilities: Deferred compensation plan obligations 88,878 88,878 Derivatives: Interest rate related and other 297 297 Interest rate swaps for customers 50,669 50,669 Foreign currency exchange contracts 15,272 15,272 15,272 50,966 — 66,238 Other 13 13 $ 128,380 $ 50,966 $ 13 $ 179,359
Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs	Level 3 Instruments Year Ended December 31, 2015 (In thousands) Municipal Trust Other Private Ag loan svcg and int-only strips Derivatives Balance at December 31, 2014 $ 4,164 $ 393,007 $ 4,761 $ 97,649 $ 12,227 $ (12 ) Total net gains (losses) included in: Statement of income: Accretion of purchase discount on securities available-for-sale 3 471 Dividends and other investment loss (3,657 ) Equity securities gains, net 7,270 Fixed income securities losses, net (344 ) (136,691 ) (606 ) Other noninterest income 1,480 Other noninterest expense 12 Other comprehensive income (loss) 687 141,547 (74 ) Fair Value of HTM securities reclassified as AFS 57,308 Purchases 24,898 993 Sales (2,651 ) (440,055 ) (4,081 ) (4,107 ) Redemptions and paydowns (1,859 ) (15,587 ) (2,026 ) (1,186 ) Balance at December 31, 2015 $ — $ — $ — $ 120,027 $ 13,514 $ — Level 3 Instruments Year Ended December 31, 2014 (In thousands) Municipal Trust Trust 1 Auction Other Private Ag loan svcg and int-only strips Derivatives Balance at December 31, 2013 $ 10,662 $ 1,238,820 $ 22,996 $ 6,599 $ 25,800 $ 82,410 $ 8,852 $ (4,303 ) Total net gains (losses) included in: Statement of income: Accretion of purchase discount on securities available-for-sale 32 2,151 3 Dividends and other investment income 3,976 Fair value and nonhedge derivative loss (7,894 ) Equity securities gains, net 5,869 Fixed income securities gains (losses), net 126 (3,097 ) 1,399 50 10,917 Other noninterest income 857 Other noninterest expense 228 Other comprehensive income (loss) (376 ) 146,303 (19 ) (15 ) Purchases 21,768 3,351 Sales (5,679 ) (818,647 ) (24,395 ) (922 ) (36,670 ) (10,448 ) Redemptions and paydowns (601 ) (103,330 ) (950 ) (7 ) (5,926 ) (833 ) 11,956 Transfers to Level 2 (69,193 ) Balance at December 31, 2014 $ 4,164 $ 393,007 $ — $ 4,761 $ 25 $ 97,649 $ 12,227 $ (13 )
Schedule Of Realized Gains (Losses) Using Level 3 Inputs	(In thousands) Year Ended December 31, 2015 2014 Dividends and other investment income (loss) $ (2 ) $ 518 Equity securities losses, net (11,311 ) — Fixed income securities gains (losses), net (137,641 ) 9,395
Schedule Of Assets With Fair Value Changes On Nonrecurring Basis	(In thousands) Fair value at December 31, 2015 Gains (losses) from fair value changes Year Ended December 31, 2015 Level 1 Level 2 Level 3 Total ASSETS Private equity investments, carried at cost $ — $ — $ 10,707 $ 10,707 $ (5,119 ) Impaired loans — 10,991 — 10,991 (12,039 ) Other real estate owned — 2,388 — 2,388 (2,467 ) $ — $ 13,379 $ 10,707 $ 24,086 $ (19,625 )	(In thousands) Fair value at December 31, 2014 Gains (losses) from fair value changes Year Ended December 31, 2014 Level 1 Level 2 Level 3 Total ASSETS Private equity investments, carried at cost $ — $ — $ 23,454 $ 23,454 $ (2,527 ) Impaired loans — 19,453 — 19,453 (9,776 ) Other real estate owned — 8,034 — 8,034 (6,784 ) $ — $ 27,487 $ 23,454 $ 50,941 $ (19,087 )
Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments	December 31, 2015 (In thousands) Gross amounts not offset in the balance sheet Description Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Cash collateral received/pledged Net amount Assets: Federal funds sold and security resell agreements $ 619,758 $ — $ 619,758 $ — $ — $ 619,758 Derivatives (included in other assets) 77,638 — 77,638 (5,916 ) — 71,722 $ 697,396 $ — $ 697,396 $ (5,916 ) $ — $ 691,480 Liabilities: Federal funds and other short-term borrowings $ 346,987 $ — $ 346,987 $ — $ — $ 346,987 Derivatives (included in other liabilities) 72,568 — 72,568 (5,916 ) (61,134 ) 5,518 $ 419,555 $ — $ 419,555 $ (5,916 ) $ (61,134 ) $ 352,505 December 31, 2014 (In thousands) Gross amounts not offset in the balance sheet Description Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Cash collateral received/pledged Net amount Assets: Federal funds sold and security resell agreements $ 1,386,291 $ — $ 1,386,291 $ — $ — $ 1,386,291 Derivatives (included in other assets) 66,420 — 66,420 (3,845 ) (18 ) 62,557 $ 1,452,711 $ — $ 1,452,711 $ (3,845 ) $ (18 ) $ 1,448,848 Liabilities: Federal funds and other short-term borrowings $ 244,223 $ — $ 244,223 $ — $ — $ 244,223 Derivatives (included in other liabilities) 66,064 — 66,064 (3,845 ) (57,547 ) 4,672 $ 310,287 $ — $ 310,287 $ (3,845 ) $ (57,547 ) $ 248,895 December 31, 2015 December 31, 2014 (Amounts in thousands) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 545,648 $ 552,088 2 $ 647,252 $ 677,196 3 Loans and leases (including loans held for sale), net of allowance 40,193,374 39,535,365 3 39,591,499 39,426,141 3 Financial liabilities: Time deposits 2,130,680 2,129,742 2 2,406,924 2,408,550 2 Foreign deposits 294,391 294,321 2 328,391 328,447 2 Long-term debt (less fair value hedges) 817,348 838,796 2 1,090,778 1,159,287 2

Operating Segment Information O

Operating Segment Information Operating Segment Information (Tables)	12 Months Ended
	Dec. 31, 2015
Operating Segment Information [Abstract]
Schedule of Segment Reporting Information, by Segment	(In millions) Zions Bank Amegy CB&T 2015 2014 2013 2015 2014 2013 2015 2014 2013 CONDENSED INCOME STATEMENT Net interest income $ 583.0 $ 581.4 $ 595.0 $ 398.0 $ 386.8 $ 386.5 $ 390.8 $ 412.5 $ 469.0 Provision for loan losses (28.3 ) (58.5 ) (40.5 ) 91.3 32.2 4.2 (4.4 ) (20.1 ) (16.7 ) Net interest income after provision for loan losses 611.3 639.9 635.5 306.7 354.6 382.3 395.2 432.6 485.7 Net impairment losses on investment securities — — (7.7 ) — — — — — — Loss on sale of investment securities to Parent — — — — — — — — — Other noninterest income 136.3 206.4 199.9 137.9 140.4 137.0 74.1 53.9 79.3 Noninterest expense 514.7 494.3 481.4 379.8 357.3 333.3 295.9 321.3 352.4 Income (loss) before income taxes and minority interest 232.9 352.0 346.3 64.8 137.7 186.0 173.4 165.2 212.6 Income tax expense (benefit) 82.6 130.4 121.7 20.0 44.5 58.6 67.2 63.9 72.5 Net income (loss) 150.3 221.6 224.6 44.8 93.2 127.4 106.2 101.3 140.1 Net income (loss) applicable to noncontrolling interests 0.9 1.2 — — — — — — — Net income (loss) applicable to controlling interest $ 149.4 $ 220.4 $ 224.6 $ 44.8 $ 93.2 $ 127.4 $ 106.2 $ 101.3 $ 140.1 YEAR-END BALANCE SHEET DATA Total assets $ 19,744 $ 19,079 $ 18,590 $ 14,062 $ 13,888 $ 13,620 $ 12,187 $ 11,340 $ 10,923 Cash and due from banks 375 385 362 228 219 407 56 85 157 Money market investments 1,118 3,384 3,890 2,072 2,199 2,551 1,814 1,670 1,108 Total securities 5,103 2,331 1,520 465 277 362 714 296 331 Total loans 12,334 12,251 12,259 10,115 10,077 9,217 8,832 8,530 8,574 Total deposits 16,900 16,633 16,257 11,634 11,491 11,199 10,520 9,707 9,328 Shareholders’ equity: Preferred equity 280 280 280 226 226 226 162 162 162 Common equity 1,693 1,615 1,523 2,030 1,998 1,988 1,424 1,390 1,342 Noncontrolling interests 32 11 — — — — — — — Total shareholders’ equity 2,005 1,906 1,803 2,256 2,224 2,214 1,586 1,552 1,504 (In millions) NBAZ NSB Vectra 2015 2014 2013 2015 2014 2013 2015 2014 2013 CONDENSED INCOME STATEMENT Net interest income $ 160.6 $ 162.0 $ 163.0 $ 112.9 $ 112.9 $ 113.6 $ 103.7 $ 102.1 $ 102.7 Provision for loan losses 7.9 (21.5 ) (15.0 ) (28.3 ) (20.9 ) (12.0 ) 4.7 (8.4 ) (4.9 ) Net interest income after provision for loan losses 152.7 183.5 178.0 141.2 133.8 125.6 99.0 110.5 107.6 Net impairment losses on investment securities — — — — — (3.3 ) — — (0.1 ) Loss on sale of investment securities to Parent — — — — — — — — — Other noninterest income 38.6 36.0 35.0 35.7 32.2 37.8 21.0 19.9 24.6 Noninterest expense 131.5 145.1 142.7 129.5 132.8 131.8 97.2 98.3 99.5 Income (loss) before income taxes and minority interest 59.8 74.4 70.3 47.4 33.2 28.3 22.8 32.1 32.6 Income tax expense (benefit) 17.8 27.9 26.4 15.9 10.9 9.5 7.1 10.7 11.2 Net income (loss) 42.0 46.5 43.9 31.5 22.3 18.8 15.7 21.4 21.4 Net income (loss) applicable to noncontrolling interests — — — — — — — — — Net income (loss) applicable to controlling interest $ 42.0 $ 46.5 $ 43.9 $ 31.5 $ 22.3 $ 18.8 $ 15.7 $ 21.4 $ 21.4 YEAR-END BALANCE SHEET DATA Total assets $ 5,024 $ 4,771 $ 4,579 $ 4,441 $ 4,096 $ 3,980 $ 3,310 $ 2,999 $ 2,571 Cash and due from banks 80 51 77 54 51 79 32 28 51 Money market investments 238 371 221 1,036 655 710 475 407 6 Total securities 601 395 362 920 831 774 274 179 166 Total loans 3,909 3,750 3,724 2,285 2,421 2,297 2,468 2,320 2,278 Total deposits 4,369 4,133 3,931 4,035 3,690 3,590 2,889 2,591 2,178 Shareholders’ equity: Preferred equity 85 85 120 50 50 50 25 25 70 Common equity 522 481 418 330 332 317 331 315 246 Noncontrolling interests — — — — — — — — — Total shareholders’ equity 607 566 538 380 382 367 356 340 316 (In millions) TCBW Other Consolidated Company 2015 2014 2013 2015 2014 2013 2015 2014 2013 CONDENSED INCOME STATEMENT Net interest income $ 30.2 $ 31.5 $ 30.1 $ (63.9 ) $ (109.2 ) $ (163.6 ) $ 1,715.3 $ 1,680.0 $ 1,696.3 Provision for loan losses (2.9 ) (0.9 ) (2.3 ) — — 0.1 40.0 (98.1 ) (87.1 ) Net interest income after provision for loan losses 33.1 32.4 32.4 (63.9 ) (109.2 ) (163.7 ) 1,675.3 1,778.1 1,783.4 Net impairment losses on investment securities — — — — — (154.0 ) — — (165.1 ) Loss on sale of investment securities to Parent — — (2.7 ) — — 2.7 — — — Other noninterest income 4.8 2.5 4.6 (71.3 ) 17.3 (15.7 ) 377.1 508.6 502.5 Noninterest expense 16.5 33.4 22.2 35.4 82.8 151.1 1,600.5 1,665.3 1,714.4 Income (loss) before income taxes and minority interest 21.4 1.5 12.1 (170.6 ) (174.7 ) (481.8 ) 451.9 621.4 406.4 Income tax expense (benefit) 7.2 0.5 4.2 (75.4 ) (65.9 ) (161.2 ) 142.4 222.9 142.9 Net income (loss) 14.2 1.0 7.9 (95.2 ) (108.8 ) (320.6 ) 309.5 398.5 263.5 Net income (loss) applicable to noncontrolling interests — — — (0.9 ) (1.2 ) (0.3 ) — — (0.3 ) Net income (loss) applicable to controlling interest $ 14.2 $ 1.0 $ 7.9 $ (94.3 ) $ (107.6 ) $ (320.3 ) $ 309.5 $ 398.5 $ 263.8 YEAR-END BALANCE SHEET DATA Total assets $ 1,198 $ 970 $ 1,010 $ (296 ) $ 66 $ 758 $ 59,670 $ 57,209 $ 56,031 Cash and due from banks 22 34 31 (49 ) (11 ) 9 798 842 1,173 Money market investments 349 123 182 (374 ) (245 ) (209 ) 6,728 8,564 8,459 Total securities 110 83 93 50 170 717 8,237 4,562 4,325 Total loans 704 713 689 3 2 5 40,650 40,064 39,043 Total deposits 986 816 845 (959 ) (1,213 ) (965 ) 50,374 47,848 46,363 Shareholders’ equity: Preferred equity 3 3 3 (2 ) 173 93 829 1,004 1,004 Common equity 116 103 101 233 132 (474 ) 6,679 6,366 5,461 Noncontrolling interests — — — (32 ) (11 ) — — — — Total shareholders’ equity 119 106 104 199 294 (381 ) 7,508 7,370 6,465

Parent Company Financial Info51

Parent Company Financial Information (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	(In thousands) December 31, 2015 2014 ASSETS Cash and due from banks $ 18,375 $ 23,774 Interest-bearing deposits 775,649 1,007,916 Security resell agreements 100,000 — Investment securities: Held-to-maturity, at adjusted cost (approximate fair value $0 and $34,691) — 17,292 Available-for-sale, at fair value 45,168 130,964 Other noninterest-bearing investments 28,178 33,577 Investments in subsidiaries: Commercial bank 7,312,654 7,094,597 Other subsidiaries 84,010 94,681 Receivables from subsidiaries: Other subsidiaries 60 15,060 Other assets 83,710 106,233 $ 8,447,804 $ 8,524,094 LIABILITIES AND SHAREHOLDERS’ EQUITY Other liabilities $ 123,849 $ 85,480 Subordinated debt to affiliated trusts 164,950 168,043 Long-term debt: Due to affiliates — 20 Due to others 651,486 901,021 Total liabilities 940,285 1,154,564 Shareholders’ equity: Preferred stock 828,490 1,004,011 Common stock 4,766,731 4,723,855 Retained earnings 1,966,910 1,769,705 Accumulated other comprehensive loss (54,612 ) (128,041 ) Total shareholders’ equity 7,507,519 7,369,530 $ 8,447,804 $ 8,524,094
Condensed Statements Of Income	(In thousands) Year Ended December 31, 2015 2014 2013 Interest income: Commercial bank $ 1,162 $ 1,489 $ 862 Other subsidiaries 3 16 — Other loans and securities 3,014 10,900 17,764 Total interest income 4,179 12,405 18,626 Interest expense: Affiliated trusts 4,308 4,265 12,202 Other borrowed funds 63,665 117,700 172,480 Total interest expense 67,973 121,965 184,682 Net interest loss (63,794 ) (109,560 ) (166,056 ) Provision for loan losses — — (23 ) Net interest loss after provision for loan losses (63,794 ) (109,560 ) (166,033 ) Other income: Dividends from consolidated subsidiaries: Commercial bank 233,853 236,012 421,406 Other subsidiaries 100 400 200 Equity and fixed income securities gains (losses), net 37,161 300,275 (7,332 ) Net impairment losses on investment securities — — (95,637 ) Other income (loss) 12,512 6,475 (8,285 ) 283,626 543,162 310,352 Expenses: Salaries and employee benefits 24,674 17,457 26,014 Debt extinguishment cost 135 44,422 120,192 Other operating expenses 10,473 10,559 1,436 35,282 72,438 147,642 Income (loss) before income taxes and undistributed income (loss) of consolidated subsidiaries 184,550 361,164 (3,323 ) Income tax expense (benefit) (27,140 ) 55,865 (135,472 ) Income before equity in undistributed income of consolidated subsidiaries 211,690 305,299 132,149 Equity in undistributed income (loss) of consolidated subsidiaries: Commercial bank 108,350 97,673 129,562 Other subsidiaries (10,569 ) (4,510 ) 2,080 Net income 309,471 398,462 263,791 Preferred stock dividends (62,857 ) (71,894 ) (95,512 ) Preferred stock redemption — — 125,700 Net earnings applicable to common shareholders $ 246,614 $ 326,568 $ 293,979
Condensed Statements Of Cash Flows	(In thousands) Year Ended December 31, 2015 2014 2013 CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 309,471 $ 398,462 $ 263,791 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed net income of consolidated subsidiaries (97,781 ) (93,163 ) (131,642 ) Net impairment losses on investment securities — — 95,637 Debt extinguishment cost 135 44,422 120,192 Other, net 78,580 149,280 69,394 Net cash provided by operating activities 290,405 499,001 417,372 CASH FLOWS FROM INVESTING ACTIVITIES Net decrease (increase) in money market investments 132,267 (1,007,844 ) 650,736 Collection of advances to subsidiaries 56,000 15,000 10,000 Advances to subsidiaries (41,000 ) (30,060 ) (10,000 ) Proceeds from sales and maturities of investment securities 124,419 372,357 27,916 Purchases of investment securities (46,851 ) — (4,858 ) Decrease of investment in subsidiaries 15,000 6,310 175,000 Other, net 4,010 24,319 10,642 Net cash provided by (used in) investing activities 243,845 (619,918 ) 859,436 CASH FLOWS FROM FINANCING ACTIVITIES Net change in short-term funds borrowed — — (3,368 ) Proceeds from issuance of long-term debt — — 646,408 Repayments of long-term debt (271,120 ) (1,147,641 ) (835,031 ) Debt extinguishment cost paid (135 ) (35,435 ) (45,812 ) Proceeds from issuance of preferred stock — — 784,318 Proceeds from issuance of common stock 22,392 526,438 9,825 Cash paid for preferred stock redemptions (175,669 ) — (799,468 ) Dividends paid on preferred stock (62,857 ) (64,868 ) (95,512 ) Dividends paid on common stock (45,198 ) (31,262 ) (24,148 ) Other, net (7,062 ) (5,619 ) (16,137 ) Net cash used in financing activities (539,649 ) (758,387 ) (378,925 ) Net increase (decrease) in cash and due from banks (5,399 ) (879,304 ) 897,883 Cash and due from banks at beginning of year 23,774 903,078 5,195 Cash and due from banks at end of year $ 18,375 $ 23,774 $ 903,078

Summary Of Significant Accoun52

Summary Of Significant Accounting Policies (Details) $ in Millions	Dec. 31, 2015USD ($)Banks	Dec. 31, 2015USD ($)Banks
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of States in which Entity Operates | Banks	11	11
Percentage of ownership in equity investments (greater than)	20.00%	20.00%
Security resell agreements maturity days	30
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value	$ 500	$ 500
Security resell agreements maximum amount, outstanding	$ 1,600	$ 1,600
Percentage of acquired assets and all assumed liabilities recognized in business combination	100.00%
Estimated useful lives of core deposit assets and other intangibles (in years)	12 years
Unconsolidated subsidiaries accounted for under the cost, fair value, or equity method when ownerhsip is less than	20.00%	20.00%
Number of variable interest entities consolidated	0	0
Security resell agreements average amount		$ 569
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives of properties, Minimum (in years)	25 years
Minimum [Member] | Furniture And Equipment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives of properties, Minimum (in years)	3 years
Minimum [Member] | Software License Arrangement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives of properties, Minimum (in years)	3 years
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives of properties, Minimum (in years)	40 years
Maximum [Member] | Furniture And Equipment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives of properties, Minimum (in years)	10 years
Maximum [Member] | Software License Arrangement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives of properties, Minimum (in years)	10 years

Merger And Acquisition Activity

Merger And Acquisition Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Recognized gain on sale of stock	$ 11,875	$ 13,471	$ 8,520

Supplemental Cash Flow Inform54

Supplemental Cash Flow Information (Schedule Of Noncash Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Information [Abstract]
Real Estate Owned, Transfer to Real Estate Owned	$ 11,924	$ 25,189	$ 60,749
Transfer of Portfolio Loans and Leases to Held-for-sale	(5,048)	(26,272)	(36,301)
PreferredStockTransferredToRetainedEarningsAsAResultOfPreferredStockRedemption	0	0	125,700
Amortized Cost of Securities Reclassified from HTM to AFS	$ 79,276	$ 0	$ 181,915

Offsetting Assets and Liabili55

Offsetting Assets and Liabilities Cash and Money Market Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Gain (Loss) on Investments [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 72,600
Assets [Member] | Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts recognized	619,758	$ 1,386,291
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	619,758	1,386,291
Gross amounts not offset in the balance sheet	0	0
Net amount	619,758	1,386,291
Assets [Member] | Assets, Total [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts recognized	697,396	1,452,711
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	697,396	1,452,711
Gross amounts not offset in the balance sheet	0	(18)
Net amount	691,480	1,448,848
Assets [Member] | Derivative Assets Included In Other Assets [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts recognized	77,638	66,420
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	77,638	66,420
Gross amounts not offset in the balance sheet	0	(18)
Net amount	71,722	62,557
Other Liabilities [Member]
Gain (Loss) on Investments [Line Items]
Derivative Liability, Fair Value, Gross Liability	72,568	66,064
Other Liabilities [Member] | Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts recognized	346,987	244,223
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	346,987	244,223
Gross amounts not offset in the balance sheet	0	0
Net amount	346,987	244,223
Other Liabilities [Member] | Liabilities, Total [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts recognized	419,555	310,287
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	419,555	310,287
Gross amounts not offset in the balance sheet	(61,134)	(57,547)
Net amount	352,505	248,895
Other Liabilities [Member] | Derivative Liabilities Included Other liabilities [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	72,568	66,064
Gross amounts not offset in the balance sheet	(61,134)	(57,547)
Net amount	5,518	4,672
Derivative Liability, Fair Value, Gross Liability		66,064
Financial Instruments [Domain] | Assets [Member] | Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts not offset in the balance sheet	0	0
Financial Instruments [Domain] | Assets [Member] | Assets, Total [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts not offset in the balance sheet	(5,916)	(3,845)
Financial Instruments [Domain] | Assets [Member] | Derivative Assets Included In Other Assets [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts not offset in the balance sheet	(5,916)	(3,845)
Financial Instruments [Domain] | Other Liabilities [Member] | Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts not offset in the balance sheet	0	0
Financial Instruments [Domain] | Other Liabilities [Member] | Liabilities, Total [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts not offset in the balance sheet	(5,916)	(3,845)
Financial Instruments [Domain] | Other Liabilities [Member] | Derivative Liabilities Included Other liabilities [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts not offset in the balance sheet	$ (5,916)	$ (3,845)

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Thousands	6 Months Ended	12 Months Ended			24 Months Ended
	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)Securities	Dec. 31, 2014USD ($)Securities	Dec. 31, 2013USD ($)	Dec. 31, 2015USD ($)Securities
Investment [Line Items]
Interest on securities		$ 124,086	$ 101,936	$ 103,442
Amortized cost of CDO securities sold	$ 574,000		$ 1,020,000
Number of HTM investment securities in an unrealized loss position | Securities		187	153		187
Number of AFS investment securities in an unrealized loss position | Securities		709	458		709
Amortized Cost of Securities Reclassified from HTM to AFS		$ 79,276	$ 0	181,915
Asset Impairment Charges		250	27	$ 165,134
Carrying value of pledged securities		2,300,000	1,400,000		$ 2,300,000
Available-for-sale Securities, Amortized Cost Basis		7,672,590	3,955,888		7,672,590
Private equity investments prohibited by Volker rule		18,000			18,000
Private Equity Investments		137,000			137,000
Private Equity Investments Sold Prohibited by Volcker Rule		9,000	8,000		17,000
Net Realized Gains on Sale of Private Equity Investments Prohibited by Volcker Rule		5,600
Net Impairment on Private Equity Investments Prohibited by Volcker Rule		4,700
Commitments for private equity and onther noninterest bearing investments		22,000			22,000
Net Fixed Income Securities Gains From Sale of CDOs	$ 137,000
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule		7,000			$ 7,000
Volcker Rule and Interim Final Rule [Member] | CDO Trust Preferred Securities [Member]
Investment [Line Items]
Asset Impairment Charges			10,400
Available-for-sale Securities [Member]
Investment [Line Items]
Amortized Cost of Securities Reclassified from HTM to AFS			$ 79,000
Equity Securities [Member]
Investment [Line Items]
Net Realized Gains on Sale of Private Equity Investments Prohibited by Volcker Rule		5,100
Dividends And Other Investment Income [Member]
Investment [Line Items]
Net Realized Gains on Sale of Private Equity Investments Prohibited by Volcker Rule		$ 500

Investment Securities (Summary

Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Held-to-maturity Securities, Unrecognized Holding Loss			$ 1,467
Held-to-maturity, fair value		$ 552,088	677,196
Held To Maturity Securities Gross Unrealized Losses	[1]		39,699
Held-to-maturity, Amortized cost		545,648	686,951
Held To Maturity Securities Gross Unrealized Gains	[1]		0
Available-for-sale debt securities, Amortized cost		7,571,978
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	[1]	27,163
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	[1]	56,661
Available-for-sale debt securities, Estimated fair value		7,542,480	3,708,625
Available-for-sale equity securities, Gross unrealized gains, Recognized in OCI	[1]		31,603
Available-for-sale equity securities, Gross unrealized losses, Recognized in OCI	[1]		142,275
Available-for-sale equity securities, Carrying value			3,708,625
Available-for-sale, at fair value		7,643,116	3,844,248
Available-for-sale Equity Securities, Amortized Cost Basis			3,819,297
Available-for-sale Securities, Amortized Cost Basis		7,672,590	3,955,888
Available-for-sale, Gross unrealized gains, Recognized in OCI	[1]	27,224	31,679
Available-for-sale, Gross unrealized losses, Recognized in OCI	[1]	56,698	143,319
Available-for-sale, Carrying value			3,844,248
amortized cost of investment securities		8,218,238	4,642,839
Gross Unrealized Gains of Investment Securities Recognized in OCI		38,442	31,679
Gross Unrealized Losses of Investment Securities Recognized in OCI		61,476	183,018
Carrying Value of Investment Securities			4,491,500
Estimated Fair Value of Investment Securities		8,195,204	4,521,444
Held-to-maturity Securities		545,648	647,252
Held-to-maturity Securities, Unrecognized Holding Gain			31,411
Municipal Securities [Member]
Investment [Line Items]
Held-to-maturity Securities, Unrecognized Holding Loss			804
Held-to-maturity, fair value		552,088	619,889
Held To Maturity Securities Gross Unrealized Losses	[1]	4,778	0
Held-to-maturity, Amortized cost		545,648	607,675
Held To Maturity Securities Gross Unrealized Gains	[1]	11,218	0
Available-for-sale debt securities, Amortized cost		417,374	189,059
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	[1]	2,177	1,143
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	[1]	856	945
Available-for-sale debt securities, Carrying value			189,257
Available-for-sale debt securities, Estimated fair value		418,695	189,257
Held-to-maturity Securities			607,675
Held-to-maturity Securities, Unrecognized Holding Gain			13,018
Available-for-sale, Other debt securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost		25,454
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	[1]	152
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	[1]	2,665
Available-for-sale debt securities, Estimated fair value		22,941
Trust Preferred Securities - Banks And Insurance [Member] | Asset-Backed Securities [Member]
Investment [Line Items]
Held-to-maturity Securities, Unrecognized Holding Loss			663
Held-to-maturity, fair value			57,307
Held To Maturity Securities Gross Unrealized Losses	[1]		39,699
Held-to-maturity, Amortized cost			79,276
Held To Maturity Securities Gross Unrealized Gains	[1]		0
Available-for-sale equity securities, Gross unrealized gains, Recognized in OCI	[1]		103
Available-for-sale equity securities, Gross unrealized losses, Recognized in OCI	[1]		121,984
Available-for-sale equity securities, Carrying value			415,708
Available-for-sale, at fair value			415,708
Available-for-sale Equity Securities, Amortized Cost Basis			537,589
Held-to-maturity Securities			39,577
Held-to-maturity Securities, Unrecognized Holding Gain			18,393
Other [Member] | Asset-Backed Securities [Member]
Investment [Line Items]
Available-for-sale equity securities, Gross unrealized gains, Recognized in OCI	[1]		207
Available-for-sale equity securities, Gross unrealized losses, Recognized in OCI	[1]		7
Available-for-sale equity securities, Carrying value			5,452
Available-for-sale, at fair value			5,452
Available-for-sale Equity Securities, Amortized Cost Basis			5,252
Agency Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost		1,231,740	607,523
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	[1]	4,313	1,572
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	[1]	2,658	8,343
Available-for-sale debt securities, Carrying value			600,752
Available-for-sale debt securities, Estimated fair value		1,233,395	600,752
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost		3,964,593	935,164
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	[1]	7,919	12,132
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	[1]	36,037	2,105
Available-for-sale debt securities, Carrying value			945,191
Available-for-sale debt securities, Estimated fair value		3,936,475	945,191
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost		1,932,817	1,544,710
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	[1]	12,602	16,446
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	[1]	14,445	8,891
Available-for-sale debt securities, Carrying value			1,552,265
Available-for-sale debt securities, Estimated fair value		1,930,974	1,552,265
Mutual Funds And Other [Member]
Investment [Line Items]
Available-for-sale, at fair value			135,623
Available-for-sale Securities, Amortized Cost Basis			136,591
Available-for-sale, Gross unrealized gains, Recognized in OCI	[1]		76
Available-for-sale, Gross unrealized losses, Recognized in OCI	[1]		1,044
Available-for-sale, Carrying value			$ 135,623
Mutual Funds And Stock [Member]
Investment [Line Items]
Available-for-sale, at fair value		100,636
Available-for-sale Securities, Amortized Cost Basis		100,612
Available-for-sale, Gross unrealized gains, Recognized in OCI	[1]	61
Available-for-sale, Gross unrealized losses, Recognized in OCI	[1]	$ 37
[1]	The gross unrealized losses recognized in OCI on HTM securities resulted from a previous transfer of AFS securities to HTM

Investment Securities (Contract

Investment Securities (Contractual Maturities Debt Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Held-to-maturity, Due in one year or less, Amortized cost	$ 64,213
Held-to-maturity, Due in one year or less, Estimated fair value	64,453
Held-to-maturity, Due after one year through five years, Estimated fair value	202,124
Held-to-maturity, Due after five years through ten years, Estimated fair value	156,676
Held-to-maturity, Due after ten years, Amortized cost	129,292
Held-to-maturity, Due after ten years, Estimated fair value	128,835
Held-to-maturity, Amortized cost	545,648	$ 686,951
Held-to-maturity, fair value	552,088	677,196
Available-for-sale, Due in one year or less, Amortized cost	1,040,087
Available-for-sale, Due in one year or less, Estimated fair value	1,036,107
Held To Maturity Securities Debt Maturities One Year Through Five Years, Amortized Cost	198,818
Available-for-sale, Due after one year through five years, Amortized cost	2,932,469
Available-for-sale, Due after one year through five years, Estimated fair value	2,921,436
Held To Maturity Securities Debt Maturities Five Years Through Ten Years, Amortized Cost	153,325
Available-for-sale, Due after five years through ten years, Amortized cost	2,606,838
Available-for-sale, Due after five years through ten years, Estimated fair value	2,597,827
Available-for-sale, Due after ten years, Amortized cost	992,584
Available-for-sale, Due after ten years, Estimated fair value	987,110
Available-for-sale, Amortized cost	7,571,978
Available-for-sale, Estimated fair value	$ 7,542,480	$ 3,708,625

Investment Securities (Summar59

Investment Securities (Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	$ 42,879	$ 13,602
Available-for-sale, Less than 12 months - Estimated fair value	4,904,774	1,326,690
Available-for-sale, 12 months or more - Gross unrealized losses	13,819	129,717
Available-for-sale, 12 months or more - Estimated fair value	750,132	699,056
Available-for-sale, Total - Gross unrealized losses	56,698	143,319
Available-for-sale, Total - Estimated fair value	5,654,906	2,025,746
Investment Securities Gross Unrealized Losses Less Than 12 Months	47,400	14,182
Investment Securities Estimated Fair Value Less Than 12 Months	5,026,971	1,389,574
Investment Securities Gross Unrealized Losses 12 Months or More	14,076	170,303
Investment Securities Estimated Fair Value 12 Months or More	763,944	770,245
Investment Securities Gross Unrealized Losses Total	61,476	184,485
Investment Securities Estimated Fair Value Total	5,790,915	2,159,819
Municipal Securities [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses	4,521	527
Held-to-maturity, Less than 12 months - Estimated fair value	122,197	62,762
Held-to-maturity, 12 months or more - Gross unrealized losses	257	277
Held-to-maturity, 12 months or more - Estimated fair value	13,812	14,003
Held-to-maturity, Total - Gross unrealized losses	4,778	804
Held-to-maturity, Total - Estimated fair value	136,009	76,765
Available-for-sale, Less than 12 months - Gross unrealized losses	735	258
Available-for-sale, Less than 12 months - Estimated fair value	102,901	36,551
Available-for-sale, 12 months or more - Gross unrealized losses	121	687
Available-for-sale, 12 months or more - Estimated fair value	5,733	4,616
Available-for-sale, Total - Gross unrealized losses	856	945
Available-for-sale, Total - Estimated fair value	108,634	41,167
Available-for-sale, Unrealized losses, Other [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	0
Available-for-sale, Less than 12 months - Estimated fair value	0
Available-for-sale, 12 months or more - Gross unrealized losses	2,665
Available-for-sale, 12 months or more - Estimated fair value	12,337
Available-for-sale, Total - Gross unrealized losses	2,665
Available-for-sale, Total - Estimated fair value	12,337
Agency Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	2,176	4,510
Available-for-sale, Less than 12 months - Estimated fair value	559,196	295,694
Available-for-sale, 12 months or more - Gross unrealized losses	482	3,833
Available-for-sale, 12 months or more - Estimated fair value	131,615	101,188
Available-for-sale, Total - Gross unrealized losses	2,658	8,343
Available-for-sale, Total - Estimated fair value	690,811	396,882
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	34,583	1,914
Available-for-sale, Less than 12 months - Estimated fair value	3,639,824	425,114
Available-for-sale, 12 months or more - Gross unrealized losses	1,454	191
Available-for-sale, 12 months or more - Estimated fair value	65,071	12,124
Available-for-sale, Total - Gross unrealized losses	36,037	2,105
Available-for-sale, Total - Estimated fair value	3,704,895	437,238
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	5,348	5,869
Available-for-sale, Less than 12 months - Estimated fair value	567,365	495,817
Available-for-sale, 12 months or more - Gross unrealized losses	9,097	3,022
Available-for-sale, 12 months or more - Estimated fair value	535,376	175,523
Available-for-sale, Total - Gross unrealized losses	14,445	8,891
Available-for-sale, Total - Estimated fair value	1,102,741	671,340
Mutual Funds And Other [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	37	1,044
Available-for-sale, Less than 12 months - Estimated fair value	35,488	71,907
Available-for-sale, 12 months or more - Gross unrealized losses	0	0
Available-for-sale, 12 months or more - Estimated fair value	0	0
Available-for-sale, Total - Gross unrealized losses	37	1,044
Available-for-sale, Total - Estimated fair value	35,488	71,907
Held-to-maturity Securities [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses	4,521	580
Held-to-maturity, Less than 12 months - Estimated fair value	122,197	62,884
Held-to-maturity, 12 months or more - Gross unrealized losses	257	40,586
Held-to-maturity, 12 months or more - Estimated fair value	13,812	71,189
Held-to-maturity, Total - Gross unrealized losses	4,778	41,166
Held-to-maturity, Total - Estimated fair value	136,009	134,073
Available-for-sale Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	42,842	12,558
Available-for-sale, Less than 12 months - Estimated fair value	4,869,286	1,254,783
Available-for-sale, 12 months or more - Gross unrealized losses	13,819	129,717
Available-for-sale, 12 months or more - Estimated fair value	750,132	699,056
Available-for-sale, Total - Gross unrealized losses	56,661	142,275
Available-for-sale, Total - Estimated fair value	5,619,418	1,953,839
Asset-Backed Securities [Member] | Trust Preferred Securities - Banks And Insurance [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses	0	53
Held-to-maturity, Less than 12 months - Estimated fair value	0	122
Held-to-maturity, 12 months or more - Gross unrealized losses	0	40,309
Held-to-maturity, 12 months or more - Estimated fair value	0	57,186
Held-to-maturity, Total - Gross unrealized losses	0	40,362
Held-to-maturity, Total - Estimated fair value	0	57,308
Available-for-sale, Less than 12 months - Gross unrealized losses	0	0
Available-for-sale, Less than 12 months - Estimated fair value	0	0
Available-for-sale, 12 months or more - Gross unrealized losses	0	121,984
Available-for-sale, 12 months or more - Estimated fair value	0	405,605
Available-for-sale, Total - Gross unrealized losses	0	121,984
Available-for-sale, Total - Estimated fair value	0	405,605
Asset-Backed Securities [Member] | Auction Rate Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	0	7
Available-for-sale, Less than 12 months - Estimated fair value	0	1,607
Available-for-sale, 12 months or more - Gross unrealized losses	0	0
Available-for-sale, 12 months or more - Estimated fair value	0	0
Available-for-sale, Total - Gross unrealized losses	0	7
Available-for-sale, Total - Estimated fair value	$ 0	$ 1,607

Investment Securities (Rollforw

Investment Securities (Rollforward Of Total Amount Of Credit-Related OTTI) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Balance of credit-related OTTI at beginning of period		$ (104,551)	$ (185,885)
Credit-related OTTI not previously recognized	[1]	0	0
Credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost basis	[2]	0	(27)
Subtotal of amounts recognized in earnings		0	27
HTM Securities Transfered to AFS Securities		0	0
Reductions for securities sold during the period		104,551	81,361
Balance of credit-related OTTI at end of period		0	(104,551)
Reductions for Securities the Company Intends to Sell or Will be Required to Sell Before Recovery of Amortized Cost Basis		0	0
Held-to-maturity Securities [Member]
Investment [Line Items]
Balance of credit-related OTTI at beginning of period		(9,079)	(9,052)
Credit-related OTTI not previously recognized	[1]	0	0
Credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost basis	[2]	0	(27)
Subtotal of amounts recognized in earnings		0	27
HTM Securities Transfered to AFS Securities		9,079	0
Reductions for securities sold during the period		0	0
Balance of credit-related OTTI at end of period		0	(9,079)
Reductions for Securities the Company Intends to Sell or Will be Required to Sell Before Recovery of Amortized Cost Basis		0	0
Available-for-sale Securities [Member]
Investment [Line Items]
Balance of credit-related OTTI at beginning of period		(95,472)	(176,833)
Credit-related OTTI not previously recognized	[1]	0	0
Credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost basis	[2]	0	0
Subtotal of amounts recognized in earnings		0	0
HTM Securities Transfered to AFS Securities		(9,079)	0
Reductions for securities sold during the period		104,551	81,361
Balance of credit-related OTTI at end of period		0	(95,472)
Reductions for Securities the Company Intends to Sell or Will be Required to Sell Before Recovery of Amortized Cost Basis		$ 0	$ 0
[1]	Relates to securities not previously impaired.
[2]	Relates to additional impairment on securities previously impaired.

Investment Securities Noncredit

Investment Securities Noncredit Related Other Than Temporary Impairment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Noncredit Related Losses On Securities Not Expected To Be Sold [Line Items]
Noncredit-related losses on securities not expected to be sold (recognized in other comprehensive income)	$ 0	$ 0	$ 23,472
Held-to-maturity Securities [Member]
Noncredit Related Losses On Securities Not Expected To Be Sold [Line Items]
Noncredit-related losses on securities not expected to be sold (recognized in other comprehensive income)	0	0	16,114
Available-for-sale Securities [Member]
Noncredit Related Losses On Securities Not Expected To Be Sold [Line Items]
Noncredit-related losses on securities not expected to be sold (recognized in other comprehensive income)	$ 0	$ 0	$ 7,358

Investment Securities (Gains An

Investment Securities (Gains And Losses, Including OTTI, Recognized In Statement Of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]
Noncredit-related losses on securities not expected to be sold (recognized in other comprehensive income)	$ 0	$ 0	$ 23,472
Equity securities gains (losses)	11,875	13,471	8,520
Investment securities, Held-to-maturity, Gross gains	1	18	81
Investment securities Held-to-maturity, Gross losses	0	27	403
Investment securities, Available-for-sale, Gross gains	8,443	92,525	13,881
Investment securities, Available-for-sale, Gross losses	147,656	83,815	181,591
Other noninterest-bearing investments, Nonmarketable equity securities, Gross gains	25,045	23,706	10,182
Other noninterest-bearing investments, Nonmarketable equity securities, Gross losses	12,693	8,544	1,662
Total investment securities and other noninterest-bearing investments, Gross gains	33,489	116,249	24,144
Total investment securities and other noninterest-bearing investments, Gross losses	160,349	92,386	183,656
Net losses	(126,860)	23,863	(159,512)
Net impairment losses on investment securities	0	(27)	(165,134)
Fixed income securities gains (losses), net	(138,735)	10,419	(2,898)
Available-for-sale Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Noncredit-related losses on securities not expected to be sold (recognized in other comprehensive income)	$ 0	$ 0	$ 7,358

Investment Securities Investmen

Investment Securities Investment Securities (Tax and Nontaxable Income by Investment Type) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investment [Line Items]
Interest on securities	$ 124,086	$ 101,936	$ 103,442
Trading Securities [Member]
Investment [Line Items]
Interest on securities	2,214	1,979	1,055
Available-for-sale Securities [Member]
Investment [Line Items]
Interest on securities	98,203	73,923	71,107
Held-to-maturity Securities [Member]
Investment [Line Items]
Interest on securities	23,669	26,034	31,280
Taxable [Member]
Investment [Line Items]
Interest on securities	109,868	88,114	90,021
Taxable [Member] | Trading Securities [Member]
Investment [Line Items]
Interest on securities	2,214	1,979	1,055
Taxable [Member] | Available-for-sale Securities [Member]
Investment [Line Items]
Interest on securities	94,877	71,365	69,061
Taxable [Member] | Held-to-maturity Securities [Member]
Investment [Line Items]
Interest on securities	12,777	14,770	19,905
Nontaxable [Member]
Investment [Line Items]
Interest on securities	14,218	13,822	13,421
Nontaxable [Member] | Trading Securities [Member]
Investment [Line Items]
Interest on securities	0	0	0
Nontaxable [Member] | Available-for-sale Securities [Member]
Investment [Line Items]
Interest on securities	3,326	2,558	2,046
Nontaxable [Member] | Held-to-maturity Securities [Member]
Investment [Line Items]
Interest on securities	$ 10,892	$ 11,264	$ 11,375

Loans And Allowance For Credi64

Loans And Allowance For Credit Losses (Narrative) (Details)	3 Months Ended	12 Months Ended
	Sep. 30, 2014USD ($)	Dec. 31, 2015USD ($)moBilling_CyclesdPayments	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable Commercial Construction and Land Development		$ 287,991,000	$ 484,888,000
Impaired Financing Receivable, Recorded Investment		566,599,000	628,728,000
Loans Pledged as Collateral		19,400,000,000	22,500,000,000
Unearned income and fees, net of related costs		150,300,000	144,700,000
Owner occupied and commercial real estate loans, unamortized premiums		26,200,000	36,500,000
Principle amount of loans held for sale sold		1,400,000,000	1,200,000,000	$ 1,600,000,000
Loans Sold and Serviced		1,300,000,000	1,300,000,000
Additions to Loans Held For Sale		1,400,000,000	1,200,000,000	1,500,000,000
Income from loans sold, excluding servicing		$ 17,800,000	15,100,000	24,100,000
Number of days for consumer loans to be charged off | d		180
Number of days for closed-end loans to be charged off | d		120
Minimum number of days past due for nonaccrual status | d		90
Minimum number of monthly payments in arrears when reporting past due | Payments		2
Minimum number of billing cycles in arrears when reported as past due | Billing_Cycles		2
Minimum number of days unpaid when reported as past due | d		30
Maximum loan amount for internally assigned loan grades		$ 750,000
Threshold for nonaccrual loans for evaluation of impairment		$ 1,000,000
Minimum number of months for borrower to meet terms For TDR status | mo		6
Unused commitments to extend credit on TDR loans		$ 7,000,000	6,000,000
Recorded investment in TDR loans modified with interest rates below market		188,000,000	219,300,000
Loans modified as troubled debt restructuring loans		134,000,000	84,700,000
Increase (decrease) on gross provision for loan losses		300,000	(1,700,000)	(10,100,000)
Total reversal amount to ALLL		3,700,000	4,600,000	15,100,000
Additional interest income due to increased cash flows from acquired loans		31,600,000	46,700,000	$ 90,900,000
Construction and land development loans, decrease	$ 447,000,000
Residential loans, increase	326,000,000
Financing Receivable, Significant Purchases	$ 248,626,000
Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		126,267,000	169,561,000
Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		$ 335,137,000	317,439,000
Subsequent payment default period, number of days | d		90
Consumer [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		$ 99,603,000	$ 107,721,000
Subsequent payment default period, number of days | d		60

Loans And Allowance For Credi65

Loans And Allowance For Credit Losses (Summary Of Major Portfolio Segment And Specific Loan Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 149,880	$ 132,504
Commercial and industrial	13,211,481	13,162,955
Leasing	441,666	408,974
Owner occupied	7,150,028	7,351,548
Municipal	675,839	520,887
Total commercial	21,479,014	21,444,364
Construction and land development	1,841,502	1,986,408
Term	8,514,401	8,126,600
Loans Receivable, Gross, Commercial, Real Estate	10,355,903	10,113,008
Home equity credit line	2,416,357	2,321,150
1-4 family residential	5,382,099	5,200,882
Construction and other consumer real estate	385,240	370,542
Bankcard and other revolving plans	443,780	401,352
Other	187,149	212,360
Total consumer	8,814,625	8,506,286
Total loans	$ 40,649,542	$ 40,063,658

Loans And Allowance For Credi66

Loans And Allowance For Credit Losses (Summary Of Changes In The Allowance For Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				$ 604,663				$ 746,291	$ 604,663	$ 746,291
Provision for loan losses	$ 22,701	$ 18,262	$ 566	(1,494)	$ 11,587	$ (54,643)	$ (54,416)	(610)	40,035	(98,082)	$ (87,136)
Adjustment for FDIC-supported loans									5	(1,305)
Gross loan and lease charge-offs									(138,929)	(106,210)
Recoveries									100,274	63,969
Net loan and lease charge-offs									(38,655)	(42,241)
Balance at end of period	606,048				604,663				606,048	604,663	746,291
Balance at beginning of period				81,076				89,705	81,076	89,705
Provision charged (credited) to earnings									(6,238)	(8,629)
Balance at end of period	74,838				81,076				74,838	81,076	89,705
Allowance for loan losses	606,048			604,663	604,663			746,291	604,663	746,291	746,291	$ 606,048	$ 604,663
Reserve for unfunded lending commitments	74,838			81,076	81,076			89,705	81,076	89,705	89,705	74,838	81,076
Total allowance for credit losses												680,886	685,739
Commercial [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				412,514				469,213	412,514	469,213
Provision for loan losses									96,995	(19,691)
Adjustment for FDIC-supported loans									(57)	(1,209)
Gross loan and lease charge-offs									(110,437)	(76,345)
Recoveries									55,262	40,546
Net loan and lease charge-offs									(55,175)	(35,799)
Balance at end of period	454,277				412,514				454,277	412,514	469,213
Balance at beginning of period				58,931				48,345	58,931	48,345
Provision charged (credited) to earnings									(1,235)	10,586
Balance at end of period	57,696				58,931				57,696	58,931	48,345
Allowance for loan losses	454,277			412,514	412,514			469,213	412,514	469,213	469,213	454,277	412,514
Reserve for unfunded lending commitments	57,696			58,931	58,931			48,345	58,931	48,345	48,345	57,696	58,931
Total allowance for credit losses												511,973	471,445
Commercial Real Estate [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				145,009				216,012	145,009	216,012
Provision for loan losses									(51,777)	(67,825)
Adjustment for FDIC-supported loans									57	0
Gross loan and lease charge-offs									(14,194)	(15,322)
Recoveries									34,897	12,144
Net loan and lease charge-offs									20,703	(3,178)
Balance at end of period	113,992				145,009				113,992	145,009	216,012
Balance at beginning of period				21,517				37,485	21,517	37,485
Provision charged (credited) to earnings									(4,991)	(15,968)
Balance at end of period	16,526				21,517				16,526	21,517	37,485
Allowance for loan losses	113,992			145,009	145,009			216,012	145,009	216,012	216,012	113,992	145,009
Reserve for unfunded lending commitments	16,526			21,517	21,517			37,485	21,517	37,485	37,485	16,526	21,517
Total allowance for credit losses												130,518	166,526
Consumer [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				47,140				61,066	47,140	61,066
Provision for loan losses									(5,183)	(10,566)
Adjustment for FDIC-supported loans									5	(96)
Gross loan and lease charge-offs									(14,298)	(14,543)
Recoveries									10,115	11,279
Net loan and lease charge-offs									(4,183)	(3,264)
Balance at end of period	37,779				47,140				37,779	47,140	61,066
Balance at beginning of period				628				3,875	628	3,875
Provision charged (credited) to earnings									(12)	(3,247)
Balance at end of period	616				628				616	628	3,875
Allowance for loan losses	37,779			47,140	47,140			61,066	47,140	61,066	61,066	37,779	47,140
Reserve for unfunded lending commitments	$ 616			$ 628	$ 628			$ 3,875	$ 628	$ 3,875	$ 3,875	616	628
Total allowance for credit losses												$ 38,395	$ 47,768

Loans And Allowance For Credi67

Loans And Allowance For Credit Losses (Summary Of ALLL And Outstanding Loan Balances According To The Company's Impairment Method) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	$ (49,525)	$ (41,713)
Allowance for loan losses: Collectively evaluated for impairment	555,578	560,150
Allowance for loan losses: Purchased loans with evidence of credit deterioration	945	2,800
Allowance for loan losses: Total	606,048	604,663	$ 746,291
Total loans	40,649,542	40,063,658
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	(36,909)	(28,627)
Allowance for loan losses: Collectively evaluated for impairment	417,295	382,552
Allowance for loan losses: Purchased loans with evidence of credit deterioration	73	1,335
Allowance for loan losses: Total	454,277	412,514	469,213
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	(3,154)	(4,027)
Allowance for loan losses: Collectively evaluated for impairment	110,417	140,090
Allowance for loan losses: Purchased loans with evidence of credit deterioration	421	892
Allowance for loan losses: Total	113,992	145,009	216,012
Total loans	1,841,502	1,986,408
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	(9,462)	(9,059)
Allowance for loan losses: Collectively evaluated for impairment	27,866	37,508
Allowance for loan losses: Purchased loans with evidence of credit deterioration	451	573
Allowance for loan losses: Total	37,779	47,140	$ 61,066
Total loans	187,149	212,360
Outstanding Loan Balances [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Outstanding loan balances: Individually evaluated for impairment	489,575	521,909
Outstanding loan balances: Collectively evaluated for impairment	40,035,044	39,362,450
Total loans	40,649,542	40,063,658
Financing Receivable, Acquired Deteriorated Credit Quality	124,923	179,299
Outstanding Loan Balances [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Outstanding loan balances: Individually evaluated for impairment	289,629	259,207
Outstanding loan balances: Collectively evaluated for impairment	21,129,125	21,105,217
Total loans	21,479,014	21,444,364
Financing Receivable, Acquired Deteriorated Credit Quality	60,260	79,940
Outstanding Loan Balances [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Outstanding loan balances: Individually evaluated for impairment	107,341	167,435
Outstanding loan balances: Collectively evaluated for impairment	10,193,840	9,861,862
Total loans	10,355,903	10,113,008
Financing Receivable, Acquired Deteriorated Credit Quality	54,722	83,711
Outstanding Loan Balances [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Outstanding loan balances: Individually evaluated for impairment	92,605	95,267
Outstanding loan balances: Collectively evaluated for impairment	8,712,079	8,395,371
Total loans	8,814,625	8,506,286
Financing Receivable, Acquired Deteriorated Credit Quality	$ 9,941	$ 15,648

Loans And Allowance For Credi68

Loans And Allowance For Credit Losses (Summary Of Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 349,860	$ 306,648
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	242,567	194,185
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	47,298	48,987
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	186	254
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	59,995	63,476
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	163,906	105,591
Leasing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	3,829	295
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	73,881	87,243
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	951	1,056
Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	7,045	23,880
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	40,253	25,107
Home Equity Credit Line [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	8,270	11,430
1-4 Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	50,254	49,861
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	748	1,735
Bankcard And Other Revolving Plans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 537	$ 196

Loans And Allowance For Credi69

Loans And Allowance For Credit Losses (Summary Of Past Due Loans (Accruing And Nonaccruing)) (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Receivable Held-for-sale, Net		$ 149,880	$ 132,504
Current		40,363,353	39,796,072
30-89 days past due		147,980	104,491
90+ days past due		138,209	163,095
Total past due		286,189	267,586
Total loans		40,649,542	40,063,658
Accruing loans 90+ days past due		32,024	29,228
Nonaccrual loans that are current	[1]	217,427	154,778
Financing Receivable, Recorded Investment, Nonaccrual Status		349,860	306,648
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		242,567	194,185
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		21,308,301	21,298,184
30-89 days past due		106,068	57,702
90+ days past due		64,645	88,478
Total past due		170,713	146,180
Total loans		21,479,014	21,444,364
Accruing loans 90+ days past due		6,737	8,011
Nonaccrual loans that are current		166,186	105,360
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		1,835,360	1,972,206
30-89 days past due		842	2,711
90+ days past due		5,300	11,491
Total past due		6,142	14,202
Total loans		1,841,502	1,986,408
Accruing loans 90+ days past due		0	92
Nonaccrual loans that are current	[1]	1,745	12,481
Financing Receivable, Recorded Investment, Nonaccrual Status		47,298	48,987
Home Equity Credit Line [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		2,407,972	2,309,967
30-89 days past due		4,717	4,503
90+ days past due		3,668	6,680
Total past due		8,385	11,183
Total loans		2,416,357	2,321,150
Accruing loans 90+ days past due		0	1
Nonaccrual loans that are current	[1]	3,053	1,779
Financing Receivable, Recorded Investment, Nonaccrual Status		8,270	11,430
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		186,436	211,560
30-89 days past due		647	644
90+ days past due		66	156
Total past due		713	800
Total loans		187,149	212,360
Accruing loans 90+ days past due		0	0
Nonaccrual loans that are current	[1]	83	84
Financing Receivable, Recorded Investment, Nonaccrual Status		186	254
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		13,114,045	13,092,731
30-89 days past due		60,523	28,295
90+ days past due		36,913	41,929
Total past due		97,436	70,224
Total loans		13,211,481	13,162,955
Accruing loans 90+ days past due		3,065	4,677
Nonaccrual loans that are current	[1]	117,942	64,385
Financing Receivable, Recorded Investment, Nonaccrual Status		163,906	105,591
Leasing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		440,963	408,724
30-89 days past due		183	225
90+ days past due		520	25
Total past due		703	250
Total loans		441,666	408,974
Accruing loans 90+ days past due		0	0
Nonaccrual loans that are current	[1]	3,309	270
Financing Receivable, Recorded Investment, Nonaccrual Status		3,829	295
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		7,085,086	7,275,842
30-89 days past due		37,776	29,182
90+ days past due		27,166	46,524
Total past due		64,942	75,706
Total loans		7,150,028	7,351,548
Accruing loans 90+ days past due		3,626	3,334
Nonaccrual loans that are current	[1]	43,984	39,649
Financing Receivable, Recorded Investment, Nonaccrual Status		73,881	87,243
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		668,207	520,887
30-89 days past due		7,586	0
90+ days past due		46	0
Total past due		7,632	0
Total loans		675,839	520,887
Accruing loans 90+ days past due		46	0
Nonaccrual loans that are current	[1]	951	1,056
Financing Receivable, Recorded Investment, Nonaccrual Status		951	1,056
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		8,469,390	8,082,940
30-89 days past due		10,424	14,415
90+ days past due		34,587	29,245
Total past due		45,011	43,660
Total loans		8,514,401	8,126,600
Accruing loans 90+ days past due		21,697	19,700
Nonaccrual loans that are current	[1]	24,867	13,787
Financing Receivable, Recorded Investment, Nonaccrual Status		40,253	25,107
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		10,304,750	10,055,146
30-89 days past due		11,266	17,126
90+ days past due		39,887	40,736
Total past due		51,153	57,862
Total loans		10,355,903	10,113,008
Accruing loans 90+ days past due		21,697	19,792
Nonaccrual loans that are current		26,612	26,268
1-4 Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		5,340,549	5,163,610
30-89 days past due		14,828	12,416
90+ days past due		26,722	24,856
Total past due		41,550	37,272
Total loans		5,382,099	5,200,882
Accruing loans 90+ days past due		1,036	318
Nonaccrual loans that are current	[1]	20,939	20,599
Financing Receivable, Recorded Investment, Nonaccrual Status		50,254	49,861
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		374,987	359,723
30-89 days past due		8,593	9,675
90+ days past due		1,660	1,144
Total past due		10,253	10,819
Total loans		385,240	370,542
Accruing loans 90+ days past due		1,337	160
Nonaccrual loans that are current	[1]	408	608
Financing Receivable, Recorded Investment, Nonaccrual Status		748	1,735
Bankcard And Other Revolving Plans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		440,358	397,882
30-89 days past due		1,861	2,425
90+ days past due		1,561	1,045
Total past due		3,422	3,470
Total loans		443,780	401,352
Accruing loans 90+ days past due		1,217	946
Nonaccrual loans that are current	[1]	146	80
Financing Receivable, Recorded Investment, Nonaccrual Status		537	196
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		8,750,302	8,442,742
30-89 days past due		30,646	29,663
90+ days past due		33,677	33,881
Total past due		64,323	63,544
Total loans		8,814,625	8,506,286
Accruing loans 90+ days past due		3,590	1,425
Nonaccrual loans that are current		24,629	23,150
Financing Receivable, Recorded Investment, Nonaccrual Status		59,995	63,476
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans		$ 634,390	$ 488,635
[1]	Represents nonaccrual loans not past due more than 30 days; however, full payment of principal and interest is still not expected.

Loans And Allowance For Credi70

Loans And Allowance For Credit Losses (Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	$ 13,211,481	$ 13,162,955
Leasing	441,666	408,974
Commercial Lending Loans - Owner Occupied	7,150,028	7,351,548
Loans and Leases Receivable, Gross, Commercial, Governments	675,839	520,887
Loans and Leases Receivable, Gross, Commercial	21,479,014	21,444,364
Construction and land development	1,841,502	1,986,408
Term	8,514,401	8,126,600
Loans Receivable, Gross, Commercial, Real Estate	10,355,903	10,113,008
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,416,357	2,321,150
1-4 family residential	5,382,099	5,200,882
Loans and Leases Receivable, Gross, Consumer, Construction	385,240	370,542
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	443,780	401,352
Loans and Leases Receivable, Gross, Consumer, Other	187,149	212,360
Loans and Leases Receivable, Gross, Consumer	8,814,625	8,506,286
Loans and Leases Receivable, Gross	40,649,542	40,063,658
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	13,211,481
Leasing	441,666
Commercial Lending Loans - Owner Occupied	7,150,028
Loans and Leases Receivable, Gross, Commercial, Governments	675,839
Loans and Leases Receivable, Gross, Commercial	21,479,014
Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	1,841,502
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	8,514,401
Loans Receivable, Gross, Commercial, Real Estate	10,355,903
Loans and Leases Receivable, Gross	1,841,502	1,986,408
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,416,357
1-4 family residential	5,382,099
Loans and Leases Receivable, Gross, Consumer, Construction	385,240
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	443,780
Loans and Leases Receivable, Gross, Consumer, Other	187,149
Loans and Leases Receivable, Gross, Consumer	8,814,625
Loans and Leases Receivable, Gross	187,149	212,360
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		12,515,846
Leasing		399,032
Commercial Lending Loans - Owner Occupied		6,844,310
Loans and Leases Receivable, Gross, Commercial, Governments		518,513
Loans and Leases Receivable, Gross, Commercial		20,277,701
Construction and land development		1,925,685
Term		7,802,571
Loans Receivable, Gross, Commercial, Real Estate		9,728,256
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,304,352
1-4 family residential		5,138,660
Loans and Leases Receivable, Gross, Consumer, Construction		367,932
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		399,446
Loans and Leases Receivable, Gross, Consumer, Other		211,811
Loans and Leases Receivable, Gross, Consumer		8,422,201
Loans and Leases Receivable, Gross	38,647,130	38,428,158
Pass [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	12,007,076
Leasing	411,131
Commercial Lending Loans - Owner Occupied	6,720,052
Loans and Leases Receivable, Gross, Commercial, Governments	663,903
Loans and Leases Receivable, Gross, Commercial	19,802,162
Pass [Member] | Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	1,786,610
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	8,319,348
Loans Receivable, Gross, Commercial, Real Estate	10,105,958
Pass [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,404,635
1-4 family residential	5,325,519
Loans and Leases Receivable, Gross, Consumer, Construction	381,738
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	440,282
Loans and Leases Receivable, Gross, Consumer, Other	186,836
Loans and Leases Receivable, Gross, Consumer	8,739,010
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		209,215
Leasing		4,868
Commercial Lending Loans - Owner Occupied		168,423
Loans and Leases Receivable, Gross, Commercial, Governments		1,318
Loans and Leases Receivable, Gross, Commercial		383,824
Construction and land development		8,464
Term		96,347
Loans Receivable, Gross, Commercial, Real Estate		104,811
Loans and Leases Receivable, Gross, Consumer, Home Equity		0
1-4 family residential		0
Loans and Leases Receivable, Gross, Consumer, Construction		0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0
Loans and Leases Receivable, Gross, Consumer, Other		0
Loans and Leases Receivable, Gross, Consumer		0
Loans and Leases Receivable, Gross	634,390	488,635
Special Mention [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	399,847
Leasing	5,166
Commercial Lending Loans - Owner Occupied	139,784
Loans and Leases Receivable, Gross, Commercial, Governments	0
Loans and Leases Receivable, Gross, Commercial	544,797
Special Mention [Member] | Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	42,348
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	47,245
Loans Receivable, Gross, Commercial, Real Estate	89,593
Special Mention [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	0
1-4 family residential	0
Loans and Leases Receivable, Gross, Consumer, Construction	0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	0
Loans and Leases Receivable, Gross, Consumer, Other	0
Loans and Leases Receivable, Gross, Consumer	0
Sub-Standard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		426,002
Leasing		5,074
Commercial Lending Loans - Owner Occupied		338,815
Loans and Leases Receivable, Gross, Commercial, Governments		1,056
Loans and Leases Receivable, Gross, Commercial		770,947
Construction and land development		52,259
Term		223,324
Loans Receivable, Gross, Commercial, Real Estate		275,583
Loans and Leases Receivable, Gross, Consumer, Home Equity		16,798
1-4 family residential		62,222
Loans and Leases Receivable, Gross, Consumer, Construction		2,610
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		1,906
Loans and Leases Receivable, Gross, Consumer, Other		549
Loans and Leases Receivable, Gross, Consumer		84,085
Loans and Leases Receivable, Gross	1,359,095	1,130,615
Sub-Standard [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	804,403
Leasing	25,369
Commercial Lending Loans - Owner Occupied	290,192
Loans and Leases Receivable, Gross, Commercial, Governments	11,936
Loans and Leases Receivable, Gross, Commercial	1,131,900
Sub-Standard [Member] | Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	12,544
Sub-Standard [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	139,036
Loans Receivable, Gross, Commercial, Real Estate	151,580
Sub-Standard [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	11,722
1-4 family residential	56,580
Loans and Leases Receivable, Gross, Consumer, Construction	3,502
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	3,498
Loans and Leases Receivable, Gross, Consumer, Other	313
Loans and Leases Receivable, Gross, Consumer	75,615
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		11,892
Leasing		0
Commercial Lending Loans - Owner Occupied		0
Loans and Leases Receivable, Gross, Commercial, Governments		0
Loans and Leases Receivable, Gross, Commercial		11,892
Construction and land development		0
Term		4,358
Loans Receivable, Gross, Commercial, Real Estate		4,358
Loans and Leases Receivable, Gross, Consumer, Home Equity		0
1-4 family residential		0
Loans and Leases Receivable, Gross, Consumer, Construction		0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0
Loans and Leases Receivable, Gross, Consumer, Other		0
Loans and Leases Receivable, Gross, Consumer		0
Loans and Leases Receivable, Gross	8,927	16,250
Doubtful [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	155
Leasing	0
Commercial Lending Loans - Owner Occupied	0
Loans and Leases Receivable, Gross, Commercial, Governments	0
Loans and Leases Receivable, Gross, Commercial	155
Doubtful [Member] | Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	0
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	8,772
Loans Receivable, Gross, Commercial, Real Estate	8,772
Doubtful [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	0
1-4 family residential	0
Loans and Leases Receivable, Gross, Consumer, Construction	0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	0
Loans and Leases Receivable, Gross, Consumer, Other	0
Loans and Leases Receivable, Gross, Consumer	0
Total Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Commercial		412,514
Loans Receivable, Gross, Commercial, Real Estate		145,009
Loans and Leases Receivable, Gross, Consumer		47,140
Loans and Leases Receivable, Gross	606,048	$ 604,663
Total Allowance [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Commercial	454,277
Total Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	113,992
Total Allowance [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer	$ 37,779

Loans And Allowance For Credi71

Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 532,395	$ 846,280
Impaired Financing Receivable, Recorded Investment	566,599	628,728
Impaired Financing Receivable, Related Allowance	48,697	42,354
Impaired Financing Receivable, Interest Income, Accrual Method	48,563	72,878
Impaired Financing Receivable, Unpaid Principal Balance	687,148	777,333
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	153,756	185,947
Impaired Financing Receivable, Recorded Investment	207,919	146,822
Impaired Financing Receivable, Related Allowance	30,538	22,852
Impaired Financing Receivable, Interest Income, Accrual Method	7,506	10,803
Impaired Financing Receivable, Unpaid Principal Balance	272,161	185,520
Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	125,777	233,361
Impaired Financing Receivable, Recorded Investment	126,267	169,561
Impaired Financing Receivable, Related Allowance	5,486	6,087
Impaired Financing Receivable, Interest Income, Accrual Method	12,450	18,221
Impaired Financing Receivable, Unpaid Principal Balance	141,526	198,231
Municipal [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	994	9,208
Impaired Financing Receivable, Recorded Investment	951	1,056
Impaired Financing Receivable, Related Allowance	0	0
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Impaired Financing Receivable, Unpaid Principal Balance	1,430	1,535
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	280,527	428,516
Impaired Financing Receivable, Recorded Investment	335,137	317,439
Impaired Financing Receivable, Related Allowance	36,024	28,939
Impaired Financing Receivable, Interest Income, Accrual Method	19,956	29,024
Impaired Financing Receivable, Unpaid Principal Balance	415,117	385,286
Term [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	111,074	238,507
Impaired Financing Receivable, Recorded Investment	117,225	160,091
Impaired Financing Receivable, Related Allowance	2,604	2,345
Impaired Financing Receivable, Interest Income, Accrual Method	16,971	31,144
Impaired Financing Receivable, Unpaid Principal Balance	142,239	203,788
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	127,266	299,575
Impaired Financing Receivable, Recorded Investment	131,859	203,568
Impaired Financing Receivable, Related Allowance	3,222	4,118
Impaired Financing Receivable, Interest Income, Accrual Method	23,381	37,528
Impaired Financing Receivable, Unpaid Principal Balance	165,030	264,781
Home Equity Credit Line [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	22,050	25,909
Impaired Financing Receivable, Recorded Investment	24,299	26,681
Impaired Financing Receivable, Related Allowance	243	437
Impaired Financing Receivable, Interest Income, Accrual Method	1,547	2,426
Impaired Financing Receivable, Unpaid Principal Balance	27,064	30,209
One Through Four Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	96,482	81,526
Impaired Financing Receivable, Recorded Investment	70,695	72,927
Impaired Financing Receivable, Related Allowance	8,736	8,494
Impaired Financing Receivable, Interest Income, Accrual Method	2,616	2,058
Impaired Financing Receivable, Unpaid Principal Balance	74,009	86,575
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2,288	3,167
Impaired Financing Receivable, Recorded Investment	2,003	2,859
Impaired Financing Receivable, Related Allowance	173	233
Impaired Financing Receivable, Interest Income, Accrual Method	123	155
Impaired Financing Receivable, Unpaid Principal Balance	2,741	3,902
Bankcard And Other Revolving Plans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	1	2
Impaired Financing Receivable, Recorded Investment	0	0
Impaired Financing Receivable, Related Allowance	0	0
Impaired Financing Receivable, Interest Income, Accrual Method	102	22
Impaired Financing Receivable, Unpaid Principal Balance	0	0
Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	3,781	7,585
Impaired Financing Receivable, Recorded Investment	2,606	5,254
Impaired Financing Receivable, Related Allowance	299	133
Impaired Financing Receivable, Interest Income, Accrual Method	838	1,665
Impaired Financing Receivable, Unpaid Principal Balance	3,187	6,580
Consumer Other Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	124,602	118,189
Impaired Financing Receivable, Recorded Investment	99,603	107,721
Impaired Financing Receivable, Related Allowance	9,451	9,297
Impaired Financing Receivable, Interest Income, Accrual Method	5,226	6,326
Impaired Financing Receivable, Unpaid Principal Balance	107,001	127,266
Commercial Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	16,192	61,068
Impaired Financing Receivable, Recorded Investment	14,634	43,477
Impaired Financing Receivable, Related Allowance	618	1,773
Impaired Financing Receivable, Interest Income, Accrual Method	6,410	6,384
Impaired Financing Receivable, Unpaid Principal Balance	22,791	60,993
Impaired Financing Receivable Recorded Investment With an Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	300,949	335,042
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	163,729	103,565
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	43,243	86,382
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Municipal [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	206,972	189,947
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Term [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	34,361	63,740
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	43,919	90,717
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Home Equity Credit Line [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	5,319	11,883
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	41,155	35,831
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	1,014	1,410
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Bankcard And Other Revolving Plans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	2,570	5,254
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	50,058	54,378
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	9,558	26,977
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	265,650	293,686
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	44,190	43,257
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	83,024	83,179
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	951	1,056
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	128,165	127,492
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	82,864	96,351
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	87,940	112,851
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Home Equity Credit Line [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	18,980	14,798
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	29,540	37,096
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	989	1,449
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Bankcard And Other Revolving Plans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	36	0
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	49,545	53,343
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 5,076	$ 16,500

Loans And Allowance For Credi72

Loans And Allowance For Credit Losses (Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 3,405	$ 2,144
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		443,780	401,352
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		194,084	245,550
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		297,088	343,329
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		999	1,008
Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		61,231	50,781
Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		55,556	27,238
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1,684	378
Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		29,827	51,781
Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		19,447	19,708
Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		951	1,056
Commercial Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		91,058	102,562
Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		75,954	48,002
Construction And Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		9,792	20,375
Construction And Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,697	20,968
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		29,558	61,240
Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		10,007	7,735
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		39,350	81,615
Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		13,704	28,703
Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	201
Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		15,421	13,579
Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,194	1,022
One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		722	502
One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		46,545	45,723
One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		10,942	19,489
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	55
Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,710	2,071
Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		210	563
Revolving Credit Facility [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0
Consumer Other Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		443,780
Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		63,676	61,373
Consumer Other Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		13,346	21,074
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2,683	1,386
Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		722	758
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		883	192
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		883	0
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Accruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	192
Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		883	0
Accruing [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Accruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	192
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2,522	1,952
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		116	1,008
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1,684	378
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Nonaccruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Nonaccruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	201
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		722	310
Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	55
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1,800	1,386
Nonaccruing [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0
Nonaccruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		722	566
Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		103,004	97,779
Multiple Modification Types [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		118,553	148,178
Multiple Modification Types [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		197,492	201,574
Multiple Modification Types [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		34,473	34,585
Multiple Modification Types [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		49,617	20,410
Multiple Modification Types [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		16,339	17,505
Multiple Modification Types [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		16,335	12,040
Multiple Modification Types [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Multiple Modification Types [Member] | Commercial Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		50,812	52,090
Multiple Modification Types [Member] | Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		65,952	32,450
Multiple Modification Types [Member] | Construction And Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		9,698	19,854
Multiple Modification Types [Member] | Construction And Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		208	6,427
Multiple Modification Types [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		20,833	39,007
Multiple Modification Types [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		5,203	4,607
Multiple Modification Types [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		30,531	58,861
Multiple Modification Types [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		5,411	11,034
Multiple Modification Types [Member] | Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,155	1,281
Multiple Modification Types [Member] | Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		233	399
Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		32,903	34,719
Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		7,299	9,413
Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,152	1,227
Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		44	100
Multiple Modification Types [Member] | Revolving Credit Facility [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0
Multiple Modification Types [Member] | Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		37,210	37,227
Multiple Modification Types [Member] | Consumer Other Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		7,576	9,912
Multiple Modification Types [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		78,939	53,396
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	38,939	18,801
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	49,846	33,956
Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	23,207	3,855
Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	3,577	5,199
Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	9,879	10,960
Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	34	2,852
Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	0	0
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	33,086	14,815
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	3,611	8,051
Other Recorded Investment Resulting From Following Modification [Member] | Construction And Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	0	521
Other Recorded Investment Resulting From Following Modification [Member] | Construction And Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	3,156	3,300
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	2,249	2,546
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	2,960	277
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	2,249	3,067
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	6,116	3,577
Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	164	166
Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	0	0
Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	3,440	753
Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1,180	3,527
Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	0	0
Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	0	0
Other Recorded Investment Resulting From Following Modification [Member] | Revolving Credit Facility [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	[1]	0
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	3,604	919
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Other Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1,180	3,527
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	10,907	15,155
Payment Deferral [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,509	8,143
Payment Deferral [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4,350	10,124
Payment Deferral [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		100	3,203
Payment Deferral [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,879	611
Payment Deferral [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	1,251
Payment Deferral [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		724	883
Payment Deferral [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Payment Deferral [Member] | Commercial Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		100	4,454
Payment Deferral [Member] | Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,603	1,494
Payment Deferral [Member] | Construction And Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Payment Deferral [Member] | Construction And Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	93
Payment Deferral [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		976	3,153
Payment Deferral [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Payment Deferral [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		976	3,153
Payment Deferral [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	93
Payment Deferral [Member] | Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Payment Deferral [Member] | Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		54	203
Payment Deferral [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		433	446
Payment Deferral [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		136	191
Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	90
Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		48	0
Payment Deferral [Member] | Revolving Credit Facility [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0
Payment Deferral [Member] | Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		433	536
Payment Deferral [Member] | Consumer Other Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		238	394
Payment Deferral [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,841	1,981
Principal Forgiveness [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		17,618	19,347
Principal Forgiveness [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		21,087	21,718
Principal Forgiveness [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		13	18
Principal Forgiveness [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Principal Forgiveness [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		929	960
Principal Forgiveness [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Principal Forgiveness [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		942	978
Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Principal Forgiveness [Member] | Construction And Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Principal Forgiveness [Member] | Construction And Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Principal Forgiveness [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		166	179
Principal Forgiveness [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Principal Forgiveness [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		166	179
Principal Forgiveness [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Principal Forgiveness [Member] | Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		9,763	11,320
Principal Forgiveness [Member] | Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,400	420
Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6,747	6,828
Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,052	1,951
Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	42
Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		17	0
Principal Forgiveness [Member] | Revolving Credit Facility [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0
Principal Forgiveness [Member] | Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		16,510	18,190
Principal Forgiveness [Member] | Consumer Other Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,469	2,371
Principal Forgiveness [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,469	2,371
Maturity Or Team Extension [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		7,439	17,704
Maturity Or Team Extension [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		11,723	22,115
Maturity Or Team Extension [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,236	6,509
Maturity Or Team Extension [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		455	576
Maturity Or Team Extension [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		681	1,124
Maturity Or Team Extension [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,669	1,219
Maturity Or Team Extension [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		951	1,056
Maturity Or Team Extension [Member] | Commercial Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,917	7,633
Maturity Or Team Extension [Member] | Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,075	2,851
Maturity Or Team Extension [Member] | Construction And Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Maturity Or Team Extension [Member] | Construction And Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		333	68
Maturity Or Team Extension [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		638	9,027
Maturity Or Team Extension [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Maturity Or Team Extension [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		638	9,027
Maturity Or Team Extension [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		333	68
Maturity Or Team Extension [Member] | Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,147	70
Maturity Or Team Extension [Member] | Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		500	0
Maturity Or Team Extension [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		353	552
Maturity Or Team Extension [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		275	1,029
Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		384	422
Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		101	463
Maturity Or Team Extension [Member] | Revolving Credit Facility [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0
Maturity Or Team Extension [Member] | Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,884	1,044
Maturity Or Team Extension [Member] | Consumer Other Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		876	1,492
Maturity Or Team Extension [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4,284	4,411
Interest Rate Below Market [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		10,026	33,377
Interest Rate Below Market [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		12,590	53,842
Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		202	2,611
Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		28	442
Interest Rate Below Market [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,999	19,981
Interest Rate Below Market [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		685	2,714
Interest Rate Below Market [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Interest Rate Below Market [Member] | Commercial Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,201	22,592
Interest Rate Below Market [Member] | Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		713	3,156
Interest Rate Below Market [Member] | Construction And Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		94	0
Interest Rate Below Market [Member] | Construction And Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	11,080
Interest Rate Below Market [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4,696	7,328
Interest Rate Below Market [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,844	2,851
Interest Rate Below Market [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4,790	7,328
Interest Rate Below Market [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,844	13,931
Interest Rate Below Market [Member] | Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		192	742
Interest Rate Below Market [Member] | Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		7	0
Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,669	2,425
Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	3,378
Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		174	290
Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Interest Rate Below Market [Member] | Revolving Credit Facility [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0
Interest Rate Below Market [Member] | Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,035	3,457
Interest Rate Below Market [Member] | Consumer Other Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		7	3,378
Interest Rate Below Market [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		$ 2,564	$ 20,465
[1]	Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.2 Includes TDRs that resulted from a combination of any of the previous modification types.

Loans And Allowance For Credi73

Loans And Allowance For Credit Losses (Summary Of Net Financial Impact On Interest Income Due To Interest Rate Modifications Below Market For Accruing TDR Loans) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	[1]	$ (2,074)	$ (2,540)
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(540)	(603)
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(468)	(770)
Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(2)	(5)
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(1,066)	(1,167)
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(261)	(84)
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(279)	(519)
Construction And Land Development [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(90)	(197)
Term [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(378)	(573)
1-4 Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(1,037)	(1,130)
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		$ (27)	$ (32)
[1]	Calculated based on the difference between the modified rate and the premodified rate applied to the recorded investment.

Loans And Allowance For Credi74

Loans And Allowance For Credit Losses (Schedule Of Investment Of Accruing And Nonaccruing Loans Modified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3,405	$ 2,144
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	883	192
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2,522	1,952
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	201
Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	201
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	999	1,008
Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	883	0
Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	116	1,008
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,684	378
Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,684	378
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2,683	1,386
Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	883	0
Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,800	1,386
Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Construction and Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Construction and Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
1-4 Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	722	502
1-4 Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	192
1-4 Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	722	310
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	55
Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	55
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	722	758
Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	192
Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 722	$ 566

Loans And Allowance For Credi75

Loans And Allowance For Credit Losses (Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Loans And Allowance For Credit Losses [Abstract]
Commercial	$ 72,440	$ 104,942
Commercial real estate	65,167	118,217
Consumer	11,082	17,910
Outstanding balance	148,689	241,069
Carrying amount	125,029	179,299
ALLL	945	2,800
Carrying amount, net	$ 124,084	$ 176,499

Loans And Allowance For Credi76

Loans And Allowance For Credit Losses (Schedule Of Changes In The Accretable Yield For PCI Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Changes in Accretable Yield [Roll Forward]
Balance at beginning of period	$ 45,055	$ 77,528
Accretion	(40,077)	(58,140)
Reclassification from nonaccretable difference	22,190	17,647
Disposals and other	12,635	8,020
Balance at end of period	$ 39,803	$ 45,055

Derivative Instruments And He77

Derivative Instruments And Hedging Activities (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Other Comprehensvie Income Loss Reclassification Adjustment From AOCI on Derivative Instruments, Gross		$ 9,000	$ 2,600
Derivatives designated for hedges of investments in foreign operations		0
Derivative Liability, Fair Value, Gross Liability		72,600
Fair values of derivative assets reduced (increased) by net credit valuation adjustments		2,400	2,400
Cash collateral used to offset fair value amount under master neeting arrangements		0	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 6,000
Notional amount of bank and insurance trust preferred CDOs		5,147,068	$ 3,488,773
Cash collateral pledged for derivative liabilities		56,600
Additional collateral that would be required to be pledge if credit rating was downgraded by one notch		$ 1,600

Derivative Instruments And He78

Derivative Instruments And Hedging Activities (Schedule Of Notional Amounts And Recorded Gross Fair Values And Related Gain (Loss) Of Derivative Instruments) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014
Derivative [Line Items]
Total derivatives, Notional amount		$ 5,147,068		$ 3,488,773
Derivatives hedging instruments, liabilities		72,600
Amount of derivative gain (loss), recognized in OCI		12,124		4,361
Amount of derivative gain (loss), Reclassified from AOCI to interest income		9,004		2,594
Derivatives instruments, Noninterest income (expense)		16,959		1,272
Derivatives designated as hedging instruments, Offset to interest expense		1,504		2,309
Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		77,638		66,420
Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		72,568		66,064
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		1,387,500		275,000
Amount of derivative gain (loss), recognized in OCI		12,124		4,361
Amount of derivative gain (loss), Reclassified from AOCI to interest income		9,004		2,594
Derivatives designated as hedging instruments, Offset to interest expense		1,504		2,309
Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Amount of derivative gain (loss), recognized in OCI		12,124		4,361
Amount of derivative gain (loss), Reclassified from AOCI to interest income		9,004		2,594	[1]
Derivatives Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		5,461		1,508
Derivatives Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		956		123
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Total derivatives, Notional amount	[2]	1,387,500		275,000
Amount of derivative gain (loss), recognized in OCI		12,124	[2]	4,361
Amount of derivative gain (loss), Reclassified from AOCI to interest income		9,004	[2]	2,594
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	[2]	5,461		1,508
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	[2]	956		123
Derivatives Designated As Hedging Instruments [Member] | Terminated Swaps On Long-Term Debt [Member] | Fair Value Hedges [Member]
Derivative [Line Items]
Derivatives designated as hedging instruments, Offset to interest expense		1,504		2,309
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		3,759,568		3,213,773
Derivatives instruments, Noninterest income (expense)		16,959		1,272
Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		72,177		64,912
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		71,612		65,941
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Total derivatives, Notional amount		40,314		0
Derivatives instruments, Noninterest income (expense)		0		355
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		0		0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		8		0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Total derivatives, Notional amount	[3]	3,256,190		2,770,052
Derivatives instruments, Noninterest income (expense)		7,438	[3]	467
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	[3]	51,353		48,287
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	[3]	53,843		50,669
Derivatives Not Designated As Hedging Instruments [Member] | Options Held [Member]
Derivative [Line Items]
Total derivatives, Notional amount		463,064		443,721
Derivatives Not Designated As Hedging Instruments [Member] | Options Held [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		20,824		16,625
Derivatives Not Designated As Hedging Instruments [Member] | Options Held [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		17,761		15,272
Derivatives Not Designated As Hedging Instruments [Member] | Futures Contracts [Member]
Derivative [Line Items]
Derivatives instruments, Noninterest income (expense)		2		0
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Derivatives instruments, Noninterest income (expense)		9,519		8,344
Derivatives Not Designated As Hedging Instruments [Member] | Total Return Swap [Member]
Derivative [Line Items]
Derivatives instruments, Noninterest income (expense)		$ 0		$ (7,894)
[1]	Amounts of $9.0 million for 2015 and $2.6 million for 2014 are the amounts of reclassification to earnings presented in the tabular changes of AOCI in Note 13.
[2]	Note: These schedules are not intended to present at any given time the Company’s long/short position with respect to its derivative contracts.1 Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss).
[3]	Amounts include both the customer swaps and the offsetting derivative contracts.

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Land	$ 229,693	$ 233,300
Investment Building and Building Improvements	598,643	551,603
Fixtures and Equipment, Gross	459,975	458,703
Leasehold Improvements, Gross	138,765	133,624
Capitalized Computer Software, Gross	295,428	239,670
Property, Plant and Equipment, Gross	1,722,504	1,616,900
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	817,042	787,091
Premises and equipment, net	$ 905,462	$ 829,809

Goodwill And Other Intangible80

Goodwill And Other Intangible Assets Goodwill and Other Intangible Assets (Narative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0
Bank Susidiaries except The Commerce Bank of Oregon [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0

Goodwill And Other Intangible81

Goodwill And Other Intangible Assets (Amortizing Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 194,532	$ 198,702
Accumulated amortization	(178,260)	(173,182)
Net carrying amount	16,272	25,520
Goodwill impairment	0
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	166,518	170,688
Accumulated amortization	(151,157)	(146,842)
Net carrying amount	15,361	23,846
Customer Relationships And Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	28,014	28,014
Accumulated amortization	(27,103)	(26,340)
Net carrying amount	$ 911	$ 1,674

Goodwill And Other Intangible82

Goodwill And Other Intangible Assets (Schedule Of Estimated Amortization Expense) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Goodwill [Line Items]
2,013	$ 7,888
2,014	6,369
2,015	1,556
2,016	459
2,017	$ 0

Goodwill And Other Intangible83

Goodwill And Other Intangible Assets (Schedule Of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 1,014,129	$ 1,014,129
Impairment losses	0
Adjustment		0
Goodwill, Ending Balance	1,014,129	1,014,129
Zions Bank [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	19,514	19,514
Impairment losses	0
Adjustment		0
Goodwill, Ending Balance	19,514	19,514
California Bank And Trust [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	379,024	379,024
Impairment losses	0
Adjustment		0
Goodwill, Ending Balance	379,024	379,024
Amegy [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	615,591	615,591
Impairment losses	0
Adjustment		0
Goodwill, Ending Balance	$ 615,591	$ 615,591

Deposits (Narrative) (Details)

Deposits (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deposits [Abstract]
Contractual maturities, time deposits, $100,000 or more, domestic, less than 3 months [Abstract] [Abstract]	$ 334
Contractual maturities, time deposits, $100,000 or more, domestic, between 3 and 6 months [Abstract]	219
Contractual maturities, time deposits, $100,000 or more, between 6 and 12 months [Abstract]	278
Contractual maturities, time deposits, $100,000 or more, after 12 months [Abstract] [Abstract]	300
Domestic time deposits under $100,000	1,500	$ 1,700
Domestic time deposits $100,000 and over	600	700
Foreign time deposits $100,000 and over	112	135
Deposit overdrafts reclassified as loan balances	$ 14	$ 15

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of All Time Deposits) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Deposits [Abstract]
2,016	$ 1,667,431
2,017	248,709
2,018	128,548
2,019	86,471
2,020	110,674
Thereafter	973
Time Deposits, total	$ 2,242,806

Short-Term Borrowings (Narrativ

Short-Term Borrowings (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)
Short-term Debt [Abstract]
Number of maturity days of short-term borrowings, maximum	30
Secured Debt, Repurchase Agreements Overnight	$ 63
Example1 of term repurchase security agreement term	30
Term repurchase securitiy agreement term example2	60
Secured Debt, Repurchase Agreements Term	$ 143
Percentage of outstanding advance for unencumbered collateral	100.00%
Amount available for FHLB advances	$ 9,100
Amount available for federal reserve borrowings	$ 4,300

Short-Term Borrowings (Summary

Short-Term Borrowings (Summary Of Short-Term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Short-term Debt [Member]
Short-term Debt [Line Items]
Year-end balance	$ 346,987	$ 244,223	$ 340,348
Security Owned and Sold, Not yet Purchased Fair Value, Security Sold, Not yet Purchased	30,158	24,230	73,606
Other short-term borrowings	0	1,200	0
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Average amount outstanding	$ 105,910	$ 104,358	$ 150,217
Weighted average rate	0.18%	0.17%	0.15%
Highest month-end balance	$ 122,461	$ 124,093	$ 206,450
Year-end balance	$ 111,263	$ 100,193	$ 129,131
Weighted average rate on outstandings at year-end	0.25%	0.15%	0.14%
Security Repurchase Agreements [Member]
Short-term Debt [Line Items]
Average amount outstanding	$ 127,358	$ 116,190	$ 124,929
Weighted average rate	0.11%	0.06%	0.05%
Highest month-end balance	$ 205,566	$ 156,710	$ 137,611
Year-end balance	$ 205,566	$ 118,600	$ 137,611
Weighted average rate on outstandings at year-end	0.15%	0.13%	0.05%

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands	Sep. 15, 2023	Nov. 15, 2018	May. 15, 2014	Dec. 15, 2013	Sep. 16, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt, Interest Rate 6.95%						6.95%
Long-Term Debt, Interest Rate 5.65%						5.65%
Stock Redeemed or Called During Period, Value						$ (176,049)		$ (799,468)
Subordinated debt converted to preferred stock						104	$ 34	1,210
Senior medium-term notes						401,595	432,385
Gains (Losses) on Extinguishment of Debt						(2,530)	$ (44,422)	$ (120,192)
Long-term debt, Parent only maturities						556,168
Series C Preferred Stock [Member]
Debt Instrument [Line Items]
Stock Redeemed or Called During Period, Value					$ 800,000
Parent Company [Member]
Debt Instrument [Line Items]
Long-term debt, Parent only maturities						556,168
4.00%
Debt Instrument [Line Items]
Senior medium-term notes						88,210
4.50%
Debt Instrument [Line Items]
Senior medium-term notes						160,950
Senior Medium-Term Note two point five five percent to five point five zero percent [Member]
Debt Instrument [Line Items]
Senior medium-term notes						11,107
Junior subordinated debentures payable to ZCTB and Stockmen's Trust II and III [Member]
Debt Instrument [Line Items]
Long-term debt, Parent only maturities						165,000
Medium-term Notes [Member]
Debt Instrument [Line Items]
Long-term debt, Parent only maturities						$ 391,200
Subordinated Notes Interest Rate 5.65 Percent [Member]
Debt Instrument [Line Items]
New interest rate		3mL+4.19%
Interest payments begin			May 15, 2014
Subordinated Notes Interest Rate 6.95 Percent [Member]
Debt Instrument [Line Items]
New interest rate	3mL+3.89%
Interest payments begin				Dec. 15, 2013

Long-Term Debt (Schedule Of Lon

Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Junior subordinated debentures related to trust preferred securities	$ 164,950	$ 168,043
Convertible subordinated notes	0	132,838
Subordinated notes	249,891	335,798
Senior medium-term notes	401,595	432,385
Long-term Federal Home Loan Bank Advances	0	22,156
Capital Lease Obligations	912	1,062
Long-term debt, total	$ 817,348	$ 1,092,282

Long-Term Debt (Schedule Of Tru

Long-Term Debt (Schedule Of Trust Preferred Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	$ 164,950	$ 164,950	$ 168,043
Amegy Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	51,547	$ 51,547
Maturity		Dec. 1, 2033
Amegy Trust II [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	36,083	$ 36,083
Maturity		Oct. 1, 2034
Amegy Trust III [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	61,856	$ 61,856
Maturity		Dec. 1, 2034
Stockmen's Trust II [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	7,732	$ 7,732
Maturity		Mar. 1, 2033
Stockmen's Trust III [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	$ 7,732	$ 7,732
Maturity		Mar. 1, 2034
Effective Interest Rate [Member] | Amegy Trust I [Member]
Subordinated Borrowing [Line Items]
Interest rate	3.38%
Effective Interest Rate [Member] | Amegy Trust II [Member]
Subordinated Borrowing [Line Items]
Interest rate	2.22%
Effective Interest Rate [Member] | Amegy Trust III [Member]
Subordinated Borrowing [Line Items]
Interest rate	2.29%
Effective Interest Rate [Member] | Stockmen's Trust II [Member]
Subordinated Borrowing [Line Items]
Interest rate	3.75%
Effective Interest Rate [Member] | Stockmen's Trust III [Member]
Subordinated Borrowing [Line Items]
Interest rate	3.42%
Contractual Interest Rate [Member] | Amegy Trust I [Member]
Subordinated Borrowing [Line Items]
Stated/contractual Interest Rate	3mL+2.85%
Contractual Interest Rate [Member] | Amegy Trust II [Member]
Subordinated Borrowing [Line Items]
Stated/contractual Interest Rate	3mL+1.90%
Contractual Interest Rate [Member] | Amegy Trust III [Member]
Subordinated Borrowing [Line Items]
Stated/contractual Interest Rate	3mL+1.78%
Contractual Interest Rate [Member] | Stockmen's Trust II [Member]
Subordinated Borrowing [Line Items]
Stated/contractual Interest Rate	3mL+3.15%
Contractual Interest Rate [Member] | Stockmen's Trust III [Member]
Subordinated Borrowing [Line Items]
Stated/contractual Interest Rate	3mL+2.89%

Long-Term Debt (Schedule Of Sub

Long-Term Debt (Schedule Of Subordinated Notes) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Subordinated Borrowing [Line Items]
Long-Term Debt, Interest Rate 5.65%	5.65%
Convertible subordinated notes	$ 0	$ 132,838
Subordinated notes, Balance	249,891	$ 335,798
Subordinated Notes Par Amount	$ 249,891
Long-term Debt, Interest Rate 6.95%	6.95%
Subordinated Notes Interest Rate 5.65 Percent [Member]
Subordinated Borrowing [Line Items]
Subordinated notes, Balance	$ 162,000
Subordinated Notes Par Amount	$ 162,000
Subordinated notes, Maturity	Nov. 1, 2023
Subordinated Notes Interest Rate 6.95 Percent [Member]
Subordinated Borrowing [Line Items]
Subordinated notes, Balance	$ 87,891
Subordinated Notes Par Amount	$ 87,891
Subordinated notes, Maturity	Sep. 1, 2028

Long-Term Debt (Schedule Of Sen

Long-Term Debt (Schedule Of Senior Medium-Term Notes) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Senior medium-term notes	$ 401,595	$ 401,595	$ 432,385
Senior Medium Term Notes, Par Amount	409,556	$ 409,556
Schedule Of Maturities On Long-Term Debt		Senior Notes: Coupon rate Maturity 3.60% Jul 2018
4.00%
Debt Instrument [Line Items]
Senior medium-term notes	88,210	$ 88,210
Senior Medium Term Notes, Par Amount	89,360	$ 89,360
Schedule Of Maturities On Long-Term Debt		June 1, 2016
4.50%
Debt Instrument [Line Items]
Senior medium-term notes	160,950	$ 160,950
Senior Medium Term Notes, Par Amount	163,857	$ 163,857
Schedule Of Maturities On Long-Term Debt		March 1, 2017
Senior Medium-Term Notes four point five zero percent with maturity of June 2023 [Member]
Debt Instrument [Line Items]
Senior medium-term notes	141,328	$ 141,328
Senior Medium Term Notes, Par Amount	$ 145,231	$ 145,231
Schedule Of Maturities On Long-Term Debt		June 1, 2023
Senior Medium-Term Note 3.3% to 3.70% [Member]
Debt Instrument [Line Items]
Schedule Of Maturities On Long-Term Debt		July 2,018
Senior Medium-Term Note 3.3% to 3.70% [Member] | Maximum [Member]
Debt Instrument [Line Items]
Schedule Of Maturities On Long-Term Debt	July 1, 2018

Long-Term Debt (Schedule Of Mat

Long-Term Debt (Schedule Of Maturities On Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Senior Medium Term Notes, Par Amount	$ 409,556	$ 409,556
Schedule Of Maturities On Long-Term Debt		Senior Notes: Coupon rate Maturity 3.60% Jul 2018
2,013	88,382	$ 88,382
2,014	161,147	161,147
2,015	11,332	11,332
2,016	259	259
2,017	60	60
Thereafter	556,168	556,168
Long-term debt, excluding associated hedges	817,348	817,348
Long-term debt (less fair value hedges)	817,348	817,348	$ 1,092,282
Parent Company [Member]
Debt Instrument [Line Items]
2,013	88,210	88,210
2,014	160,951	160,951
2,015	11,107	11,107
2,016	0	0
2,017	0	0
Thereafter	556,168	556,168
Long-term debt, excluding associated hedges	816,436	816,436
Senior Medium-Term Note two point five five percent to five point five zero percent [Member]
Debt Instrument [Line Items]
Senior Medium Term Notes, Par Amount	$ 11,108	$ 11,108
Senior Medium-Term Note 3.3% to 3.70% [Member]
Debt Instrument [Line Items]
Schedule Of Maturities On Long-Term Debt		July 2,018
Senior Medium-Term Note 3.3% to 3.70% [Member] | Maximum [Member]
Debt Instrument [Line Items]
Schedule Of Maturities On Long-Term Debt	July 1, 2018
Senior Notes, Coupon Rate Range Min [Member]
Debt Instrument [Line Items]
Senior Notes, rate		3.60%

Long-Term Debt Long-Term Debt (

Long-Term Debt Long-Term Debt (Schedule Of Early Redemption)(Details) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-Term Subordinated Notes Redeemed, Par	$ 84,444	$ 105,173
Convertible subordinated notes	0	132,838
Debt Redemptions and Repurchases, Par	287,695	1,219,108
Long-term Senior notes redeemed	27,281	1,038,261
FHLB Advances Redeemed, Par	22,009
Long-term Convertible Subordinated Notes Redeemed, Par	$ 150,868	75,674
Senior Notes, Coupon Rate Range Min [Member]
Debt Instrument [Line Items]
Senior Notes, rate	3.60%
Senior Notes, Coupon Rate Range Max [Member]
Debt Instrument [Line Items]
Senior Notes, rate	4.50%
Junior Subordinated Notes, Coupon Rate, 3mL 2.85% [Member]
Debt Instrument [Line Items]
Junior Subordinated Debt Redeemed, Par	$ 3,093
Long-Term Debt, Subordinated Note at 3mL1.25% [Member]
Debt Instrument [Line Items]
Long-Term Subordinated Notes Redeemed, Par		75,000
Subordinated Note, Coupon Rate, 6.00% [Member]
Debt Instrument [Line Items]
Long-Term Subordinated Notes Redeemed, Par	32,366
Subordinated Note, Coupon Rate, 5.50% [Member]
Debt Instrument [Line Items]
Long-Term Subordinated Notes Redeemed, Par	52,078
Long-Term Debt, Senior Note at 2.55-5.5% [Member]
Debt Instrument [Line Items]
Long-term Senior notes redeemed		247,512
Long-Term Debt, Senior Note at 3.30-3.70% [Member]
Debt Instrument [Line Items]
Long-term Senior notes redeemed	27,281
Long-Term Debt, Senior Note at 7.75% [Member]
Debt Instrument [Line Items]
Long-term Senior notes redeemed		240,769
Long-Term Debt, Senior Note at 4.0-4.5% [Member]
Debt Instrument [Line Items]
Long-term Senior notes redeemed		499,980
Long-Term Debt, Senior Note at 3.50% [Member]
Debt Instrument [Line Items]
Long-term Senior notes redeemed		50,000
Long-Term Debt, Senior Note at 7.75% [Member] [Member]
Debt Instrument [Line Items]
Long-term Convertible Subordinated Notes Redeemed, Par		75,674
Convertible Subordinated Notes, Coupon Rate, 6.00% [Member]
Debt Instrument [Line Items]
Long-term Convertible Subordinated Notes Redeemed, Par	79,276
Convertible Subordinated Notes, Coupon Rate, 5.50% [Member]
Debt Instrument [Line Items]
Long-term Convertible Subordinated Notes Redeemed, Par	$ 71,592
Subordinated Notes, Coupon Rate, 5.65% [Member]
Debt Instrument [Line Items]
Long-Term Subordinated Notes Redeemed, Par		$ 30,173

Long-Term Debt Debt Extinguishm

Long-Term Debt Debt Extinguishment Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Extinguishment of Debt [Line Items]
Redemption Premium	$ 2,395	$ 33,971	$ 45,812
Schedule of Debt Extinguishment Costs [Table Text Block]	Debt extinguishment costs are as follows for the years 2015 , 2014 and 2013 : (In thousands) 2015 2014 2013 Early tender premiums $ 2,395 $ 33,971 $ 45,812 Write-offs of unamortized debt discount and issuance costs and fees 135 10,451 74,380 Total $ 2,530 $ 44,422 $ 120,192
Write off of unamortized debt discount and issuance costs	$ 135	10,451	74,380
Gains (Losses) on Extinguishment of Debt	$ (2,530)	$ (44,422)	$ (120,192)

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details)	Jul. 29, 2014USD ($)	Sep. 16, 2013USD ($)	Jun. 03, 2013USD ($)	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013USD ($)	Dec. 31, 2010shares	Jul. 28, 2014USD ($)$ / sharesshares	Dec. 05, 2012$ / shares
Schedule of Equity Method Investments [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax					$ 48,422,000	$ 60,795,000
Liquidation preference of preferred stock (per share) | $ / shares				$ 1,000	$ 1,000
Preferred stock, authorized shares | shares				4,400,000	4,400,000	4,400,000
Carrying value, Preferred stock				$ 828,490,000	$ 828,490,000	$ 1,004,011,000
Price per share | $ / shares										$ 36.27
Common Stock				$ 4,766,731,000	$ 4,766,731,000	$ 4,723,855,000			$ 525,000,000
Common Stock, Shares, Issued | shares				204,417,093	204,417,093	203,014,903			17,600,000
Common Stock, Par or Stated Value Per Share | $ / shares									$ 29.80
Common stock value, net of commissions and fees	$ 516,000,000
Warrants sold | shares								29,300,000
Common stock issued for preferred stock redemption					$ (176,049,000)		$ (799,468,000)
Total invested assets of trusts				$ 81,800,000	81,800,000	$ 86,600,000
Total obligations of trusts				$ 96,900,000	96,900,000	100,900,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax					(331,000)	467,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax					$ 374,000	(8,764,000)
Preferred stock, liquidation preference per depositary share | $ / shares				$ 25	$ 25
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			$ 4,800,000
Common Stock Held in Trust				$ 15,200,000	$ 15,200,000	14,300,000
Warrant Exercise Price | $ / shares				$ 36.14	$ 36.14
Depositary Share, Preferred Stock Ownership Interest					1/40
Series I Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Preferred stock, authorized shares | shares				300,893,000	300,893,000
Carrying value, Preferred stock				$ 125,224,000	$ 125,224,000	300,893,000
Preferred Stock, Dividend Rate, Percentage					5.80%
Common stock issued for preferred stock redemption				175,700,000
Preferred Stock, Tender Offer				180,000,000
Stock Redemption Tender Offer, Per Share				24.65
Preferred Stock [Text Block]				$ 4,300,000
Series A Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Preferred stock, authorized shares | shares				140,000,000	140,000,000
Variable dividend payment rate					> of 4.0% or 3mL+0.52%
Carrying value, Preferred stock				$ 66,316,000	$ 66,316,000	66,168,000
Series C Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Common stock issued for preferred stock redemption		$ 800,000,000
Stock Redeemed or Called During Period, Carrying Value		926,000,000
Preferred Stock, Beneficial Conversion Feature, Intrinsic Value		$ 126,000,000
Series F Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Preferred stock, authorized shares | shares				250,000,000	250,000,000
Carrying value, Preferred stock				$ 143,750,000	$ 143,750,000	143,750,000
Preferred Stock, Dividend Rate, Percentage					7.90%
Series G Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Preferred stock, authorized shares | shares				200,000,000	200,000,000
Carrying value, Preferred stock				$ 171,827,000	$ 171,827,000	$ 171,827,000
Preferred Stock, Dividend Rate, Percentage					6.30%
Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Common stock issued for preferred stock redemption					$ (175,669,000)		(925,748,000)
Retained Earnings [Member]
Schedule of Equity Method Investments [Line Items]
Common stock issued for preferred stock redemption					(3,449,000)		125,700,000
Warrant [Member]
Schedule of Equity Method Investments [Line Items]
Common stock warrants issued to the U.S. Treasury										5,800,000
Common Stock [Member]
Schedule of Equity Method Investments [Line Items]
Common stock issued for preferred stock redemption					$ 3,069,000		$ 580,000

Shareholders' Equity (Summary O

Shareholders' Equity (Summary Of Preferred Stock) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Common Stock Held in Trust	$ 14,300	$ 15,200
Preferred stock, authorized shares	4,400,000	4,400,000
Carrying value, Preferred stock	$ 1,004,011	$ 828,490
Series A Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Rate		> of 4.0% or 3mL+0.52%
Earliest redemption date		Dec. 15, 2011
Preferred stock, authorized shares		140,000,000
Outstanding Shares at December 31, 2012		66,139,000
Carrying value, Preferred stock	66,168	$ 66,316
Series F Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Earliest redemption date		Jun. 15, 2017
Preferred stock, authorized shares		250,000,000
Outstanding Shares at December 31, 2012		143,750,000
Carrying value, Preferred stock	$ 143,750	$ 143,750
Preferred Stock, Dividend Rate, Percentage		7.90%
Series G Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Interest rate following earliest redemption date	3mL+4.24%
Earliest redemption date		Mar. 15, 2023
Preferred stock, authorized shares		200,000,000
Outstanding Shares at December 31, 2012		171,827,000
Carrying value, Preferred stock	$ 171,827	$ 171,827
Preferred Stock, Dividend Rate, Percentage		6.30%
Series H Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Earliest redemption date		Jun. 15, 2019
Preferred stock, authorized shares		126,221,000
Outstanding Shares at December 31, 2012		126,221,000
Carrying value, Preferred stock	$ 126,221	$ 126,221
Preferred Stock, Dividend Rate, Percentage		5.75%
Series I Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Interest rate following earliest redemption date	3mL+3.80%
Earliest redemption date		Jun. 15, 2023
Preferred stock, authorized shares		300,893,000
Outstanding Shares at December 31, 2012		125,224,000
Carrying value, Preferred stock	$ 300,893	$ 125,224
Preferred Stock, Dividend Rate, Percentage		5.80%
Series J Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Interest rate following earliest redemption date	3mL+4.44%
Earliest redemption date		Sep. 15, 2023
Preferred stock, authorized shares		195,152,000
Outstanding Shares at December 31, 2012		195,152,000
Carrying value, Preferred stock	$ 195,152	$ 195,152
Preferred Stock, Dividend Rate, Percentage		7.20%

Shareholders' Equity (Summary98

Shareholders' Equity (Summary Of Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (54,612)				$ (128,041)				$ (54,612)	$ (128,041)	$ (192,101)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax									48,422	60,795
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax									(331)	467
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax									374	(8,764)
Other Comprehensive Income (Loss), Tax									48,465	52,498
Other comprehensive income (loss)									73,429	64,060	254,056
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									(10,729)	69,195
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									84,158	(5,135)
Income Tax Expense (Benefit)									142,388	222,961	142,977
Net earnings (loss) applicable to common shareholders	88,197	$ 84,238	$ (1,100)	$ 75,279	66,761	$ 79,127	$ 104,490	$ 76,190	246,614	326,568	293,979
Reclassification of amortization of net actuarial gains losses pension and post retirement from AOCI, gross									(5,996)	(2,843)	(8,127)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax									0	(50)	27
Reclassification of pension and postretirement from accumulated other comprehensive income, tax									(2,278)	(1,103)	(3,194)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated other comprehensive income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(18,369)				(91,921)				(18,369)	(91,921)	(168,805)
Other comprehensive income (loss)									73,552	76,884
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									(12,471)	82,204
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									86,023	(5,320)	102,936
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated other comprehensive income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,546				2,226				1,546	2,226	1,556
Other comprehensive income (loss)									(680)	670
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									4,903	2,275
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(5,583)	(1,605)
Net earnings (loss) applicable to common shareholders									5,583	1,605	1,580
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated other comprehensive income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (37,789)				$ (38,346)				(37,789)	(38,346)	(24,852)
Other comprehensive income (loss)									557	(13,494)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									(3,161)	(15,284)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									3,718	1,790	4,906
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated other comprehensive income [Line Items]
Accretion Of Securities With Noncredit Related Impairment Losses									0	(1,878)	(2,106)
Income Tax Expense (Benefit)									0	(10)	(64,829)
Net earnings (loss) applicable to common shareholders									0	(17)	(99,903)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net									0	(27)	(164,732)
Increase (Decrease) in Deferred Income Taxes									0	767	848
Fixed income securities gain loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated other comprehensive income [Line Items]
Gain (Loss) on Investments, Excluding Other than Temporary Impairments									(138,735)	10,419	(2,898)
Income Tax Expense (Benefit)									(52,712)	3,971	(1,123)
Net earnings (loss) applicable to common shareholders									(86,023)	6,448	(1,775)
Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated other comprehensive income [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax									9,004	2,594	2,647
Income Tax Expense (Benefit)									$ 3,421	$ 989	$ 1,067

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended			180 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2030
Investments, Owned, Federal Income Tax Note [Line Items]
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	$ 0	$ 0	$ 0
Effective income tax rate reconciliation, at federal statutory income tax rate	35.00%
Deferred tax assets, valuation allowance	$ 4,261	4,261
Deferred tax assets net operating loss and tax credit carryforwards expiring through 2030	400
Year which tax effect of remaining net operating loss and tax credit carryforwards expire				Dec. 31, 2030
Unrecognized tax benefits that would impact on effective tax rate	3,900	2,100
Gross unrecogized tax benefits that may decrease during the 12 subsequent months	3,300
Accrued interest and penalties recognized net of federal and/or state tax benefits	$ 700	$ 600
Year thru which company is no longer subject to income tax examinations	2,012

Income Taxes (Schedule Of Incom

Income Taxes (Schedule Of Income Taxes (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Current Federal, Income taxes (benefit)	$ 158,164	$ 178,450	$ 173,418
Deferred Federal Income taxes (benefit)	(31,843)	14,277	(51,475)
Federal Income taxes (benefit) total	126,321	192,727	121,943
Current State, Income taxes (benefit)	14,027	18,573	29,676
Deferred State, Income taxes (benefit)	2,040	11,661	(8,642)
State Income taxes (benefit) total	16,067	30,234	21,034
Income Tax Expense (Benefit), Total	$ 142,388	$ 222,961	$ 142,977

Income Taxes (Schedule Of Statu

Income Taxes (Schedule Of Statutory Federal Income Tax Rate Reconciles To Actual Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Income tax expense (benefit) at statutory federal rate	$ 158,151	$ 217,498	$ 142,251
State income taxes, net	10,443	19,652	13,672
Other nondeductible expenses	3,205	2,949	2,574
Nontaxable income	(20,397)	(17,869)	(17,071)
Tax credits and other taxes	(2,926)	(1,717)	(2,628)
Other	(6,088)	2,448	4,179
Income Tax Expense (Benefit), Total	$ 142,388	$ 222,961	$ 142,977

Income Taxes (Schedule Of Tax E

Income Taxes (Schedule Of Tax Effects Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Gross deferred tax assets, Book loan loss deduction in excess of tax	$ 254,223	$ 258,488
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	24,749	25,142
Gross deferred tax assets, Deferred compensation	91,665	93,023
Gross deferred tax assets, Security investments and derivative fair value adjustments	11,254	22,440
Gross deferred tax assets, Net operating losses, capital losses and tax credits	4,659	5,442
FDIC Supported Transactions	9,157	15,636
Gross deferred tax assets, Other	46,016	46,521
Gross deferred tax assets	441,723	466,692
Gross deferred tax assets, Valuation allowance	(4,261)	(4,261)
Total deferred tax assets	437,462	462,431
Gross deferred tax liabilities, Core deposits and purchase accounting	(3,392)	(6,559)
Gross deferred tax liabilities, Premises and equipment, due to differences in depreciation	(10,588)	(10,361)
Gross deferred tax liabilities, FHLB stock dividends	(10,042)	(12,376)
Gross deferred tax liabilities, Leasing operations	(85,255)	(76,148)
Gross deferred tax liabilities, Prepaid expenses	(9,001)	(9,337)
Gross deferred tax liabilities, Prepaid pension reserves	(18,087)	(18,491)
Deferred Tax Liabilities, Mortgage Servicing Rights	(6,845)	(5,834)
Gross deferred tax liabilities, Subordinated debt modification	(46,451)	(64,030)
Deferred Tax Liabilities, Financing Arrangements	23,723	22,774
Deferred Tax Liabilities, Investments	21,037	12,262
Total deferred tax liabilities	(234,421)	(238,172)
Net deferred tax assets	$ 203,041	$ 224,259

Income Taxes (Schedule Of Recon

Income Taxes (Schedule Of Reconciliation Of Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Balance at beginning of year	$ 5,448	$ 3,255	$ 2,385	$ 2,385
Tax positions related to current year, Additions	786	0	0
Tax positions related to current year, Reductions	0	0	0
Tax positions related to prior years, Additions	1,407	870	0
Tax positions related to prior years, Reductions	0	0	0
Tax Adjustments, Settlements, and Unusual Provisions	0	0	0
Lapses in statutes of limitations	0	0	0
Balance at end of year	$ 5,448	$ 3,255	$ 2,385

Net Earnings Per Common Share (

Net Earnings Per Common Share (Basic And Diluted Net Earnings Per Common Share Based On The Weighted Average Outstanding Shares) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) applicable to controlling interest									$ 309,471	$ 398,462	$ 263,791
Less common and preferred dividends, Basic									(107,990)	(103,111)	6,094
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									1,836	2,933	2,832
Undistributed earnings (loss) applicable to nonvested shares, Basic									199,645	292,418	267,053
Distributed earnings applicable to common shares, Basic									(44,816)	(30,983)	(23,916)
Net earnings (loss) applicable to common shareholders									244,461	323,401	290,969
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted									0	0	0
Undistributed Earnings, Diluted									$ 201,481	$ 295,351	$ 269,885
Weighted average common shares outstanding									203,265	192,207	183,844
Net earnings (loss) per common share, Basic	$ 0.43	$ 0.41	$ (0.01)	$ 0.37	$ 0.33	$ 0.40	$ 0.56	$ 0.41	$ 1.20	$ 1.68	$ 1.58
Diluted earnings (loss) applicable to common shares, Diluted									$ 244,461	$ 323,401	$ 290,969
Additional weighted average dilutive shares, Diluted									433	582	453
Weighted average diluted common shares outstanding, Diluted									203,698	192,789	184,297
Net earnings (loss) per common share, Diluted	$ 0.43	$ 0.41	$ (0.01)	$ 0.37	$ 0.33	$ 0.40	$ 0.56	$ 0.41	$ 1.20	$ 1.68	$ 1.58

Net Earnings Per Common Share N

Net Earnings Per Common Share Net Earnings Per Common Share Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Preferred stock redemption	$ 0	$ 0	$ 125,700

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units expected to vest			1,192,702
Share Based Compensation Restricted Stock Units Aggregate Intrinsic Value			$ 32.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price			$ 28.59
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	5 years 7 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value			$ 0
Restricted Stock Units Outstanding	1,769,420	1,522,038	1,798,543	1,769,420	1,522,038	822,753
Weighted Average Grant Price of Restricted Stock Forfeited			$ 27.17	$ 25.48	$ 20.13
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 31.60	$ 35.54	$ 27.30	$ 31.60	$ 35.54	$ 38.87
Stock Options without a fixed expiration date			21,250
Total shares authorized under stock option and incentive plan			9,000,000
Number of shares available for future grants of stock options or restricted stock			7,523,768
Compensation expense not yet recognized for nonvested share-based awards			$ 26.6
Nonvested share-based awards, expected weighted average period to be recognized, years	2 years 4 months 18 days
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options			0.8	$ 0.4	$ 0.3
Total intrinsic value of stock options exercised			6.7	3.9	4
Cash received from the exercise of stock options			22.7	10.6	$ 9.8
Aggregate intrinsic value of outstanding stock options	$ 14.4		8	14.4
Aggregate intrinsic value of exercisable options	$ 11.3		$ 8	$ 11.3
Outstanding stock options, Weighted average remaining contractual life (years)	3 years 36 days	1 year 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number			1,579,501
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	5,630,502	5,874,590	3,804,095	5,630,502	5,874,590	5,962,325
Total fair value of restricted stock vesting			$ 19.4	$ 15.2	$ 13.1
Weighted average issue price			$ 29.02	$ 28.87	$ 24.55
Total fair value granted			$ 19.4	$ 15.2	$ 13.1
Stock Issued During Period, Shares, Restricted Stock Award, Gross			22,441	16,670	56,774
Restricted Stock Units Granted			790,929	727,300	949,418
Weighted Average Grant Price of Restricted Stock Units Granted			$ 29.06	$ 28.81	$ 25.99
Restricted Stock Units Vested			(673,385)	(416,755)	(160,580)
Weighted Average Grant Price of Restricted Stock Units Vested			$ 24.78	$ 22.26	$ 20.17
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross				16,670	17,444
Restricted Stock Units Granted			31,080	6,656	4,984

Share-Based Compensation (Compe

Share-Based Compensation (Compensation Expense And Related Tax Benefit For All Share-Based Awards) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation [Abstract]
Compensation expense	$ 24,974	$ 23,632	$ 28,052
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 8,284	$ 7,767	$ 9,123

Share-Based Compensation (Weigh

Share-Based Compensation (Weighted Average Of Fair Value And Significant Assumptions Used In Applying Black-Scholes Model For Options Granted) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation [Abstract]
Weighted average of fair value for options granted	$ 6.17	$ 6.10	$ 6.79
Expected dividend yield	1.30%	1.30%	1.30%
Expected volatility	25.00%	25.10%	32.50%
Risk-free interest rate	1.57%	1.55%	0.78%
Expected life (in years)	5 years	5 years	4 years 6 months

Share-Based Compensation (Summa

Share-Based Compensation (Summary Of Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Balance, Number of shares	5,630,502	5,874,590	5,962,325
Balance, Weighted average exercise price	$ 31.60	$ 35.54	$ 38.87
Granted, Number of shares	740,300	947,758	1,047,781
Granted, Weighted average exercise price	$ 29.01	$ 28.67	$ 27.41
Exercised, Number of shares	1,165,287	489,905	488,479
Exercised, Weighted average exercise price	$ 25.11	$ 21.60	$ 20.11
Expired, Number of shares	(1,322,067)	(618,207)	(574,157)
Expired, Weighted average exercise price	$ 48.44	$ 73.28	$ 70.12
Forfeited, Number of shares	(79,353)	(83,734)	(72,880)
Forfeited, Weighted average exercise price	$ 28.09	$ 25.72	$ 22.25
Balance, Number of shares	3,804,095	5,630,502	5,874,590
Balance, Weighted average exercise price	$ 27.30	$ 31.60	$ 35.54
Outstanding stock options exercisable, Number of shares	2,187,259	3,804,873	4,101,928
Outstanding stock options exercisable, Weighted average exercise price	$ 26.35	$ 33.86	$ 40.40

Share-Based Compensation (Sched

Share-Based Compensation (Schedule Of Additional Selected Information On Stock Options) (Details) - $ / shares	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding stock options, Number of shares	5,630,502	5,874,590	3,804,095	5,962,325
Outstanding stock options, Weighted average exercise price	$ 31.60	$ 35.54	$ 27.30	$ 38.87
share-based compensation award, options, outstanding, weighted average remaining contractual term			4 years 1 month 12 days
Outstanding stock options, Weighted average remaining contractual life (years)	3 years 36 days	1 year 9 months 18 days
Exercisable stock options, Number of shares	3,804,873	4,101,928	2,187,259
Exercisable stock options, Weighted average exercise price	$ 33.86	$ 40.40	$ 26.35
Exercise Price Range $0.32 To $19.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding stock options, Number of shares			552,618
Outstanding stock options, Weighted average exercise price			$ 17.20
Outstanding stock options, Weighted average remaining contractual life (years)			2 years 7 months
Exercisable stock options, Number of shares			552,618
Exercisable stock options, Weighted average exercise price			$ 17.20
Exercise Price Range $20.00 To $24.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding stock options, Number of shares			709,462
Outstanding stock options, Weighted average exercise price			$ 23.84
Outstanding stock options, Weighted average remaining contractual life (years)			1 year 10 months 15 days
Exercisable stock options, Number of shares			700,060
Exercisable stock options, Weighted average exercise price			$ 23.83
Exercise Price Range $25.00 To $29.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding stock options, Number of shares			2,344,883
Outstanding stock options, Weighted average exercise price			$ 28.35
Outstanding stock options, Weighted average remaining contractual life (years)			5 years 4 months
Exercisable stock options, Number of shares			772,369
Exercisable stock options, Weighted average exercise price			$ 27.88
Exercise Price Range $30.00 To $39.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding stock options, Number of shares			52,379
Outstanding stock options, Weighted average exercise price			$ 30.10
Outstanding stock options, Weighted average remaining contractual life (years)			4 years 4 months
Exercisable stock options, Number of shares			17,459
Exercisable stock options, Weighted average exercise price			$ 30.10
Exercise Price Range $45.00 To $49.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding stock options, Number of shares			70,200
Outstanding stock options, Weighted average exercise price			$ 47.10
Outstanding stock options, Weighted average remaining contractual life (years)			2 years 2 months 24 days
Exercisable stock options, Number of shares			70,200
Exercisable stock options, Weighted average exercise price			$ 47.10
Exercise Price Range $60.00 To $79.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding stock options, Number of shares			2,553
Outstanding stock options, Weighted average exercise price			$ 72.08
Outstanding stock options, Weighted average remaining contractual life (years)			1 year 1 month 15 days
Exercisable stock options, Number of shares			2,553
Exercisable stock options, Weighted average exercise price			$ 72.08
Exercise Price Range $80.00 To $81.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding stock options, Number of shares			36,000
Outstanding stock options, Weighted average exercise price			$ 80.65
Outstanding stock options, Weighted average remaining contractual life (years)			3 months 18 days
Exercisable stock options, Number of shares			36,000
Exercisable stock options, Weighted average exercise price			$ 80.65
Exercise Price Range $82.00 To $83.38 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding stock options, Number of shares			36,000
Outstanding stock options, Weighted average exercise price			$ 83.38
Outstanding stock options, Weighted average remaining contractual life (years)			1 year 4 months 18 days
Exercisable stock options, Number of shares			36,000
Exercisable stock options, Weighted average exercise price			$ 83.38

Share-Based Compensation (Su111

Share-Based Compensation (Summary Of Restricted Stock Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation [Abstract]
Nonvested restricted shares, Number of shares	59,370	161,220	410,950	851,236
Nonvested restricted shares, Weighted average issue price	$ 23.49	$ 21.82	$ 22.46	$ 22.07
Issued, Number of shares	22,441	16,670	56,774
Issued, Weighted average issue price	$ 29.02	$ 28.87	$ 24.55
Vested, Number of shares	(123,161)	(256,890)	(452,743)
Vested, Weighted average issue price	$ 22.32	$ 23.23	$ 21.80
Forfeited, Number of shares	(1,130)	(9,510)	(44,317)
Forfeited, Weighted average issue price	$ 23.54	$ 23.68	$ 24.31

Share-Based Compensation Share

Share-Based Compensation Share Based Compensation (Summmary of Restricted Stock Unit Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units Outstanding	1,798,543	1,769,420	1,522,038	822,753
Weighted Average Grant Price of Restricted Stock Units	$ 27.39	$ 25.64	$ 23.19	$ 19.04
Restricted Stock Units Granted	790,929	727,300	949,418
Weighted Average Grant Price of Restricted Stock Units Granted	$ 29.06	$ 28.81	$ 25.99
Restricted Stock Units Vested	(673,385)	(416,755)	(160,580)
Restricted Stock Units Forfeited	(88,421)	(63,163)	(89,553)
Weighted Average Grant Price of Restricted Stock Units Vested	$ 24.78	$ 22.26	$ 20.17
Weighted Average Grant Price of Restricted Stock Forfeited	$ 27.17	$ 25.48	$ 20.13

Guarantees, Commitments And Con

Guarantees, Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Guarantor Obligations [Line Items]
Operating Leases, Future Minimum Payments, Due in Three Years	$ 39,158
Operating Leases, Future Minimum Payments, Due in Four Years	32,524
Operating Leases, Future Minimum Payments, Due in Five Years	27,258
Operating Leases, Future Minimum Payments Due, Next Twelve Months	44,668
Operating Leases, Future Minimum Payments, Due Thereafter	102,313
Commitments to Extend Credit Expiring in One Year	4,900,000
standby letters of credit expiring in one year	684,000
Standby Letters of Credit, Thereafter	195,000
Guarantor Obligations, Current Carrying Value	5,300
Reserve for Unfunded Lending Commitments	2,200
Letters of Credit, Deferred Commitment Fees	3,100
Private Equity and other noninterest bearing investments [Table Text Block]	22,000
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule	7,000
Risk-weighted values assigned to all off-balance sheet financial and derivative instruments	6,300,000	$ 5,900,000
Cash Reserve Deposit Required and Made	295,200
Guarantee Of Trust Preferred Securities Issued By Affiliated Trusts	165,000
Capital Lease Obligations, Current	1,200
Accumulated Amortization, Deferred Finance Costs	900
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	1,500
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Two Years	1,700
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Three Years	1,600
Operating Leases, Future Minimum Payments Receivable, in Four Years	1,500
Operating Leases, Future Minimum Payments Receivable, in Five Years	600
Operating Leases, Future Minimum Payments Receivable, Thereafter	2,700
Operating Leases, Rent Expense, Net	62,500	$ 59,200	$ 58,400
Loss Contingency, Range of Possible Loss, Minimum	0
Loss Contingency, Range of Possible Loss, Maximum	$ 60,000

Guarantees, Commitments And 114

Guarantees, Commitments And Contingencies (Schedule Of Guarantees Issued) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Guarantor Obligations [Line Items]
Unused Commitments to Extend Credit	$ 17,169,785	$ 16,658,757
Commercial letters of credit	18,447	32,144
Total Unfunded Lending Commitments	18,066,629	17,620,278
Financial Guarantee [Member]
Guarantor Obligations [Line Items]
Letters Of Credit Standby	661,554	745,895
Performance Guarantee [Member]
Guarantor Obligations [Line Items]
Letters Of Credit Standby	$ 216,843	$ 183,482

Regulatory Matters (Summary Of

Regulatory Matters (Summary Of Actual Capital Amounts And Ratios For The Company And Its Three Largest Subsidiary Banks) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Total capital (to risk-weighted assets), Actual Amount	$ 7,535,760	$ 7,443,301
Capital to Risk Weighted Assets	16.00%	16.00%
Total capital (to risk-weighted assets), To be well capitalized, Amount	$ 4,674,725	$ 4,573,768
Total capital (to risk-weighted assets), To be well capitalized, Ratio	10.00%	10.00%
Tier 1 capital (to risk-weighted assets), Actual Amount	$ 6,580,326	$ 6,620,282
Tier 1 capital (to risk-weighted assets), Actual Ratio	14.00%	1447.00%
Tier 1 capital (to risk-weighted assets), To be well capitalized, Ratio	8.00%	600.00%
Common Equity Tier One Capital	$ 5,711,836
Common Equity Tier One Capital Ratio	12.00%
Common Equity Tier One Capital to be Well Capitalized Ratio	7.00%
Tier 1 capital (to average assets), Actual Ratio	11.00%	1182.00%
Parent [Member]
Tier 1 capital (to risk-weighted assets), Actual Amount	$ 6,580,326	$ 6,620,282
Tier 1 capital (to risk-weighted assets), To be well capitalized, Amount	3,739,780	2,744,261
Common Equity Tier One Capital to be Well Capitalized	3,038,571
ZB National Association [Member]
Total capital (to risk-weighted assets), Actual Amount	$ 6,918,312
Capital to Risk Weighted Assets	15.00%
Total capital (to risk-weighted assets), To be well capitalized, Amount	$ 4,661,581
Total capital (to risk-weighted assets), To be well capitalized, Ratio	10.00%
Tier 1 capital (to risk-weighted assets), Actual Amount	$ 6,334,391
Tier 1 capital (to risk-weighted assets), Actual Ratio	14.00%
Tier 1 capital (to risk-weighted assets), To be well capitalized, Amount	$ 3,729,265
Tier 1 capital (to risk-weighted assets), To be well capitalized, Ratio	8.00%
Common Equity Tier One Capital	$ 5,503,491
Common Equity Tier One Capital Ratio	12.00%
Common Equity Tier One Capital to be Well Capitalized	$ 3,030,028
Common Equity Tier One Capital to be Well Capitalized Ratio	7.00%
Zions First National Bank [Member]
Total capital (to risk-weighted assets), Actual Amount		$ 2,108,904
Capital to Risk Weighted Assets		1527.00%
Total capital (to risk-weighted assets), To be well capitalized, Amount		$ 1,381,243
Total capital (to risk-weighted assets), To be well capitalized, Ratio		1000.00%
Tier 1 capital (to risk-weighted assets), Actual Amount	$ 6,334,391	$ 1,942,856
Tier 1 capital (to risk-weighted assets), Actual Ratio		1407.00%
Tier 1 capital (to risk-weighted assets), To be well capitalized, Amount		$ 828,746
Tier 1 capital (to risk-weighted assets), To be well capitalized, Ratio		600.00%
Tier 1 capital (to average assets), Actual Ratio	11.00%	1052.00%
Tier One Leverage Capital Required to be Well Capitalized	$ 2,886,732	$ 923,193
Tier 1 capital (to average assets), To be well capitalized, Ratio	5.00%	500.00%
California Bank Trust [Member]
Total capital (to risk-weighted assets), Actual Amount		$ 1,286,095
Capital to Risk Weighted Assets		1418.00%
Total capital (to risk-weighted assets), To be well capitalized, Amount		$ 906,915
Total capital (to risk-weighted assets), To be well capitalized, Ratio		1000.00%
Tier 1 capital (to risk-weighted assets), Actual Amount		$ 1,179,129
Tier 1 capital (to risk-weighted assets), Actual Ratio		1300.00%
Tier 1 capital (to risk-weighted assets), To be well capitalized, Amount		$ 544,149
Tier 1 capital (to risk-weighted assets), To be well capitalized, Ratio		600.00%
Tier 1 capital (to average assets), Actual Ratio		1078.00%
Tier One Leverage Capital Required to be Well Capitalized		$ 547,086
Tier 1 capital (to average assets), To be well capitalized, Ratio		500.00%
Amegy Bank N.A. [Member]
Total capital (to risk-weighted assets), Actual Amount		$ 1,741,586
Capital to Risk Weighted Assets		1409.00%
Total capital (to risk-weighted assets), To be well capitalized, Amount		$ 1,236,244
Total capital (to risk-weighted assets), To be well capitalized, Ratio		1000.00%
Tier 1 capital (to risk-weighted assets), Actual Amount		$ 1,586,686
Tier 1 capital (to risk-weighted assets), Actual Ratio		1283.00%
Tier 1 capital (to risk-weighted assets), To be well capitalized, Amount		$ 741,747
Tier 1 capital (to risk-weighted assets), To be well capitalized, Ratio		600.00%
Tier 1 capital (to average assets), Actual Ratio		1179.00%
Tier One Leverage Capital Required to be Well Capitalized		$ 672,996
Tier 1 capital (to average assets), To be well capitalized, Ratio		500.00%

Retirement Plans (Schedule Of N

Retirement Plans (Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 7,094	$ 7,468	$ 6,885
Expected return on plan assets	(12,360)	(13,305)	(12,109)
Defined Benefit Plan, Amortization of Gains (Losses)	5,926	2,895	8,132
Defined Benefit Plan, Fair Value of Plan Assets	157,318	170,199
Settlement loss - net periodic benefit cost (credit)	0	0	1,814
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) in AOCI expected to be recognized in next year	(6,638)
Defined Benefit Plan, Benefit Obligation	173,208	185,944	169,092
Service cost	0	0	0
Interest cost	7,094	7,468
Defined Benefit Plan, Actuarial Net (Gains) Losses	(8,085)	20,859
Defined Benefit Plan, Fair Value of Plan Assets	157,318	170,199	171,905
Defined Benefit Plan, Actual Return on Plan Assets	(1,136)	9,769
Defined Benefit Plan, Contributions by Employer	0	0
Defined Benefit Plan, Benefits Paid	(11,745)	(11,475)
Defined Benefit Plan, Funded Status of Plan	(15,890)	(15,745)
Defined Benefit Plan, Net Periodic Benefit Cost	660	(2,942)	4,722
Supplemental Employee Retirement Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) in AOCI expected to be recognized in next year	(117)
Defined Benefit Plan, Benefit Obligation	9,994	10,595	10,276
Service cost	0	0	0
Interest cost	403	454	404
Defined Benefit Plan, Amortization of Gains (Losses)	123	19	70
Amortization of prior service cost (credit)	0	50	124
Defined Benefit Plan, Actuarial Net (Gains) Losses	(226)	738
Defined Benefit Plan, Fair Value of Plan Assets	0	0	0
Defined Benefit Plan, Actual Return on Plan Assets	0	0
Defined Benefit Plan, Contributions by Employer	778	873
Defined Benefit Plan, Benefits Paid	(778)	(873)
Defined Benefit Plan, Funded Status of Plan	(9,994)	(10,595)
Settlement loss - net periodic benefit cost (credit)	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	526	523	598
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) in AOCI expected to be recognized in next year	66
Defined Benefit Plan, Benefit Obligation	954	1,067	1,062
Service cost	33	31	32
Interest cost	40	47	41
Defined Benefit Plan, Amortization of Gains (Losses)	(53)	(71)	(75)
Amortization of prior service cost (credit)	0	0	(151)
Defined Benefit Plan, Actuarial Net (Gains) Losses	(121)	19
Defined Benefit Plan, Fair Value of Plan Assets	0	0	0
Defined Benefit Plan, Actual Return on Plan Assets	0	0
Defined Benefit Plan, Contributions by Employer	65	92
Defined Benefit Plan, Benefits Paid	(65)	(92)
Defined Benefit Plan, Funded Status of Plan	(954)	(1,067)
Defined Benefit Plan, Net Periodic Benefit Cost	$ 20	$ 7	$ (153)

Retirement Plans (Narrative) (D

Retirement Plans (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013USD ($)
Defined Benefit Plan Disclosure [Line Items]
Composite market value factor, minimum range	0.995927	1.018148
Composite market value factor, maximum range	1.049539	1.081039
Fair Value Level Transfers Among Levels 1, 2, and 3	0	0
Owner Occupied And Commercial Real Estate Loans Unamortized Premiums	$ 26,200	$ 36,500
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	0
Benefit liability other supplement retirement plans	$ 6,900	$ 6,300
Shares of company common stock | shares	233,849	262,209
Dividends received under the plan	$ 56	$ 43
Rate of employee contribution from earnings	80.00%
Matching contribution allocation rate first time	0.00%
Employee contribution rate for first time matching	3.00%
Matching contribution allocation rate second time	50.00%
Employees contribution rate for second time matching	2.00%
Employer contribution in common stock	$ 25,500	24,300	$ 22,700
Minimum range of eligible compensation for noncontributory profit sharing feature	0.00%
Maximum range of eligible compensation for noncontributory profit sharing feature	6.00%
Accrued profit sharing expense	$ 6,100	$ 12,000	$ 11,800
Contribution rate of profit sharing expenses	0.01	0
Composite market value factor, at end of period	1.042254	1.063133
Limited Partnerships, Capital Commitment	$ 8,750
Defined Benefit Plans [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Level Transfers Among Levels 1, 2, and 3	0	0
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation percentage in equity	65.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation percentage in equity	30.00%
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation percentage in equity	5.00%

Retirement Plans (Summary Of Re

Retirement Plans (Summary Of Reconciliation Of The Beginning And Ending Balances Of Assets Measured At Fair Value On A Recurring Basis Using Level 3 Inputs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 170,199
Fair value of plan assets at end of year	157,318	$ 170,199
Limited Partner [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Administration Expenses	(88)	(93)
Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Administration Expenses	(376)	(267)
Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	6,205
Fair value of plan assets at end of year	6,179	6,205
Defined benefit plan investment purchases	1,110	1,014
Purchases	0	0
Defined Benefit Plan, Settlements, Plan Assets	(1,744)	(1,144)
Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	11,515
Fair value of plan assets at end of year	9,484	11,515
Defined benefit plan investment purchases	10,428	9,995
Purchases	(11,739)	(11,529)
Defined Benefit Plan, Settlements, Plan Assets	0	0
Realized Appreciation (Depreciation) In Fair Value Of Investments [Member] | Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Net increases (decreases) included in plan statement of changes in net assets available for benefits	539	211
Realized Appreciation (Depreciation) In Fair Value Of Investments [Member] | Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Net increases (decreases) included in plan statement of changes in net assets available for benefits	0	0
Unrealized Appreciation (Depreciation) In Fair Value Of Investments [Member] | Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Net increases (decreases) included in plan statement of changes in net assets available for benefits	157	925
Unrealized Appreciation (Depreciation) In Fair Value Of Investments [Member] | Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Net increases (decreases) included in plan statement of changes in net assets available for benefits	(628)	375
Interest And Dividends [Member] | Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Net increases (decreases) included in plan statement of changes in net assets available for benefits	0	0
Interest And Dividends [Member] | Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Net increases (decreases) included in plan statement of changes in net assets available for benefits	284	359
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	138,872
Fair value of plan assets at end of year	129,923	138,872
Fair Value, Inputs, Level 2 [Member] | Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	6,205	5,292
Fair value of plan assets at end of year	6,179	6,205
Fair Value, Inputs, Level 2 [Member] | Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	11,515	12,582
Fair value of plan assets at end of year	9,484	11,515
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	17,720
Fair value of plan assets at end of year	15,663	17,720
Fair Value, Inputs, Level 3 [Member] | Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	6,205
Fair value of plan assets at end of year	6,179	6,205
Fair Value, Inputs, Level 3 [Member] | Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	11,515
Fair value of plan assets at end of year	$ 9,484	$ 11,515

Retirement Plans (Schedule Of W

Retirement Plans (Schedule Of Weighted Average Assumptions Based On The Pension Plan) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Discount rate, benefit obligation	4.20%	3.95%	4.60%
Discount rate, net periodic benefit cost	395.00%	460.00%	375.00%
Expected long-term return on plan assets, net periodic benefit cost	750.00%	800.00%	800.00%
Rate of compensation increase, net periodic benefit cost			350.00%

Retirement Plans (Summary Of Th

Retirement Plans (Summary Of The Fair Values Of Pension Plan Investments According To The Fair Value Hierarchy And The Weighted Average Allocations) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 157,318	$ 170,199
Investment Owned, Percent of Net Assets	10000.00%	10000.00%
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 11,732	$ 13,607
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	129,923	138,872
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	15,663	17,720
Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 9,484	$ 11,515
Investment Owned, Percent of Net Assets	600.00%	700.00%
Guaranteed Deposit Account [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 9,484	$ 11,515	$ 12,582
Guaranteed Deposit Account [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	9,484	11,515
Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 6,179	$ 6,205
Investment Owned, Percent of Net Assets	400.00%	400.00%
Limited Partnerships [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 6,179	$ 6,205	$ 5,292
Limited Partnerships [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	6,179	6,205
Common Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 6,482	$ 7,560
Investment Owned, Percent of Net Assets	400.00%	400.00%
Common Stock [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 6,482	$ 7,560
Common Stock [Member] | Insurance Company Pooled Separate Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 88,355	$ 97,094
Investment Owned, Percent of Net Assets	5600.00%	5700.00%
Common Stock [Member] | Insurance Company Pooled Separate Accounts [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 88,355	$ 97,094
Debt Investments [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 5,250	$ 6,047
Investment Owned, Percent of Net Assets	400.00%	400.00%
Debt Investments [Member] | Mutual Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 5,250	$ 6,047
Debt Investments [Member] | Insurance Company Pooled Separate Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 31,659	$ 33,167
Investment Owned, Percent of Net Assets	2000.00%	1900.00%
Debt Investments [Member] | Insurance Company Pooled Separate Accounts [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 31,659	$ 33,167
Real Estate [Member] | Insurance Company Pooled Separate Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 9,909	$ 8,611
Investment Owned, Percent of Net Assets	600.00%	500.00%
Real Estate [Member] | Insurance Company Pooled Separate Accounts [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 9,909	$ 8,611

Retirement Plans Fair values of

Retirement Plans Fair values of pension plan assets - Level 3 rolforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 157,318	$ 170,199
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	129,923	138,872
Limited Liability Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan investment sales	0	0
Defined Benefit Plan, Settlements, Plan Assets	(1,744)	(1,144)
Defined Benefit Plan, Fair Value of Plan Assets	6,179	6,205
Defined benefit plan investment purchases	1,110	1,014
Limited Liability Company [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	6,179	6,205	$ 5,292
Limited Liability Company [Member] | Realized Investment Gains (Losses) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)	539	211
Limited Liability Company [Member] | Marketable Securities Unrealized Gain (Loss) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)	157	925
Limited Liability Company [Member] | Investment Income, Interest and Dividends [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)	0	0
Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan investment sales	(11,739)	(11,529)
Defined Benefit Plan, Settlements, Plan Assets	0	0
Defined Benefit Plan, Fair Value of Plan Assets	9,484	11,515
Defined benefit plan investment purchases	10,428	9,995
Guaranteed Deposit Account [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	9,484	11,515	$ 12,582
Guaranteed Deposit Account [Member] | Realized Investment Gains (Losses) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)	0	0
Guaranteed Deposit Account [Member] | Marketable Securities Unrealized Gain (Loss) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)	(628)	375
Guaranteed Deposit Account [Member] | Investment Income, Interest and Dividends [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)	284	359
Limited Partner [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Administration Expenses	88	93
Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Administration Expenses	$ 376	$ 267

Retirement Plans Retirement Pla

Retirement Plans Retirement Plans (Unfunded Commitments and Redemption) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Compensation and Retirement Disclosure [Abstract]
Retirement Plans, Limited Partnership, Unfunded Commitments	$ 1,600

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Other noninterest-bearing investments valued under the cost method	$ 25,300,000	$ 39,100,000
Principal amount of other real estate owned property sold	19,200,000	41,400,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	191,500,000	224,400,000
OREO Properties [Member]
Derivatives, Fair Value [Line Items]
Net gains on sale of OREO properties	4,000,000	8,800,000
Impairment of OREO properties	600,000	700,000
Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	7,581,309,000	3,336,943,000
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0	$ 401,957,000
Third Party Pricing Service [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	$ 0.92

Fair Value (Schedule Of Assets

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading account, at fair value	$ 48,168	$ 70,601
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	61,807	105,348
Total assets	167,201	210,851
Securities sold, not yet purchased	30,158	24,230
Total liabilities	132,489	128,380
Level 1 [Member] | Mutual Funds And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	61,807	105,348
Level 1 [Member] | Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	84,570	88,878
Other liabilities	84,570	88,878
Level 1 [Member] | Available-for-sale Securities [Member] | U.S. Treasury, Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	0	0
Level 1 [Member] | Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	20,824	16,625
Other liabilities	17,761	15,272
Level 1 [Member] | Derivatives [Member] | Foreign Currency Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	20,824	16,625
Other liabilities	17,761	15,272
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	7,581,309	3,336,943
Trading account, at fair value	48,168	70,601
Total assets	8,172,774	3,933,629
Securities sold, not yet purchased	0	0
Total liabilities	54,678	50,966
Level 2 [Member] | Mutual Funds And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	38,829	30,275
Level 2 [Member] | Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	$ 485,978	$ 476,290
Level 2 [Member] | Private Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments
Level 2 [Member] | Available-for-sale Securities [Member] | U.S. Treasury, Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	$ 7,100,844	$ 3,098,208
Level 2 [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	418,695	185,093
Level 2 [Member] | Asset-Backed Securities [Member] | Trust Preferred - Banks And Insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities		22,701
Level 2 [Member] | Asset-Backed Securities [Member] | Other (Including ABS CDOs) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities		666
Level 2 [Member] | Asset-Backed Securities [Member] | Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	22,941
Level 2 [Member] | Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	57,319	49,795
Other liabilities	54,678	50,966
Level 2 [Member] | Derivatives [Member] | Interest Rate Related And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	5,966	1,508
Other liabilities	835	297
Level 2 [Member] | Derivatives [Member] | Interest Rate Swaps For Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	51,353	48,287
Other liabilities	53,843	50,669
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	0	401,957
Total assets	133,541	511,833
Securities sold, not yet purchased	$ 0	0
Other liabilities		13
Total liabilities	$ 0	13
Fair Value, Inputs, Level 3 [Member] | Private Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	120,027	97,649
Fair Value, Inputs, Level 3 [Member] | Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	13,514	12,227
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | U.S. Treasury, Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	$ 0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities		4,164
Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member] | Trust Preferred - Banks And Insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities		393,007
Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member] | Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities		4,761
Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member] | Other (Including ABS CDOs) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities		25
Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member] | Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities
Fair Value, Inputs, Level 3 [Member] | Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	$ 0	0
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	7,643,116	3,844,248
Trading account, at fair value	48,168	70,601
Total assets	8,473,516	4,656,313
Securities sold, not yet purchased	30,158	24,230
Other liabilities	0	13
Total liabilities	187,167	179,359
Estimated Fair Value [Member] | Mutual Funds And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	100,636	135,623
Estimated Fair Value [Member] | Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	485,978	476,290
Estimated Fair Value [Member] | Private Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	120,027	97,649
Estimated Fair Value [Member] | Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	13,514	12,227
Estimated Fair Value [Member] | Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	84,570	88,878
Other liabilities	84,570	88,878
Estimated Fair Value [Member] | Available-for-sale Securities [Member] | U.S. Treasury, Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	7,100,844	3,098,208
Estimated Fair Value [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	418,695	189,257
Estimated Fair Value [Member] | Asset-Backed Securities [Member] | Trust Preferred - Banks And Insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities		415,708
Estimated Fair Value [Member] | Asset-Backed Securities [Member] | Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities		4,761
Estimated Fair Value [Member] | Asset-Backed Securities [Member] | Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	22,941	691
Estimated Fair Value [Member] | Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	78,143	66,420
Other liabilities	72,439	66,238
Estimated Fair Value [Member] | Derivatives [Member] | Interest Rate Related And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	5,966	1,508
Other liabilities	835	297
Estimated Fair Value [Member] | Derivatives [Member] | Interest Rate Swaps For Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	51,353	48,287
Other liabilities	53,843	50,669
Estimated Fair Value [Member] | Derivatives [Member] | Foreign Currency Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	20,824	16,625
Other liabilities	$ 17,761	$ 15,272

Fair Value (Schedule Of Asse125

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Instruments, Gain (Loss) [Table Text Block]	Year Ended December 31, 2015 Year Ended December 31, 2014 Amount of derivative gain (loss) recognized/reclassified (In thousands) OCI Reclassified from AOCI to interest income Noninterest income (expense) Offset to interest expense OCI Reclassified from AOCI to interest income Noninterest income (expense) Offset to interest expense Derivatives designated as hedging instruments Cash flow hedges: 1 Interest rate swaps $ 12,124 $ 9,004 $ 4,361 $ 2,594 12,124 9,004 3 4,361 2,594 3 Fair value hedges: Terminated swaps on long-term debt $ 1,504 $ 2,309 Total derivatives designated as hedging instruments 12,124 9,004 1,504 4,361 2,594 2,309 Derivatives not designated as hedging instruments Interest rate swaps $ — $ 355 Interest rate swaps for customers 2 7,438 467 Futures contracts 2 — Foreign exchange 9,519 8,344 Total return swap — (7,894 ) Total derivatives not designated as hedging instruments 16,959 1,272 Total derivatives $ 12,124 $ 9,004 $ 16,959 $ 1,504 $ 4,361 $ 2,594 $ 1,272 $ 2,309 Note: These schedules are not intended to present at any given time the Company’s long/short position with respect to its derivative contracts. 1 Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). 2 Amounts include both the customer swaps and the offsetting derivative contracts. 3 Amounts of $9.0 million for 2015 and $2.6 million for 2014 are the amounts of reclassification to earnings presented in the tabular changes of AOCI in Note 13.
Total net gains (losses) included in, Other noninterest expense	$ 241,459	$ 280,984	$ 300,286
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	1,480	857
Total net gains (losses) included in, Purchases	993
Total net gains (losses) included in, Redemptions and paydowns	(1,186)
Total net gains (losses) included, in Redemptions and paydowns, Liabilities		(833)
Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	4,164	10,662
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	3	32
Total net gains (losses) included in, Fixed income securities gains (losses), net	(344)	126
Total net gains (losses) included in, Other comprehensive income (loss)	687	(376)
Total net gains (losses) included in, Sales	2,651	5,679
Total net gains (losses) included in, Redemptions and paydowns	(1,859)	(601)
Fair value of assets, Ending balance	0	4,164	10,662
Trust Preferred - Banks And Insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	393,007	1,238,820
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	471	2,151
Total net gains (losses) included in, Fixed income securities gains (losses), net	(136,691)	(3,097)
Total net gains (losses) included in, Other comprehensive income (loss)	141,547	146,303
Fair Value of Securities Reclassified from HTM to AFS	$ 57,308
Total net gains (losses) included in, Purchases
Total net gains (losses) included in, Sales	$ 440,055	818,647
Total net gains (losses) included in, Redemptions and paydowns	(15,587)	(103,330)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Reclassification		(69,193)
Fair value of assets, Ending balance	0	393,007	1,238,820
Trust Preferred Securities - Real Estate Investment Trusts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	0	$ 22,996
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale
Total net gains (losses) included in, Fixed income securities gains (losses), net		$ 1,399
Total net gains (losses) included in, Other comprehensive income (loss)
Total net gains (losses) included in, Sales		$ 24,395
Fair value of assets, Ending balance		0	22,996
Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	4,761	6,599
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale		3
Total net gains (losses) included in, Fixed income securities gains (losses), net		50
Total net gains (losses) included in, Other comprehensive income (loss)		(19)
Total net gains (losses) included in, Sales		922
Total net gains (losses) included in, Redemptions and paydowns		(950)
Fair value of assets, Ending balance		4,761	6,599
Other Asset-Backed [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	$ 25	$ 25,800
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale
Total net gains (losses) included in, Fixed income securities gains (losses), net	$ (606)	$ 10,917
Total net gains (losses) included in, Other comprehensive income (loss)	(74)	(15)
Total net gains (losses) included in, Sales	$ 4,081	36,670
Total net gains (losses) included in, Redemptions and paydowns		(7)
Fair value of assets, Ending balance	$ 0	25	25,800
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	97,649	82,410
Total net gains (losses) included in, Dividends and other investment income	(3,657)	3,976
Total net gains (losses) included in, Equity securities gains, net	7,270	5,869
Total net gains (losses) included in, Purchases	24,898	21,768
Total net gains (losses) included in, Sales	(4,107)	(10,448)
Total net gains (losses) included in, Redemptions and paydowns	(2,026)	(5,926)
Fair value of assets, Ending balance	120,027	$ 97,649	82,410
Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Instruments, Gain (Loss) [Table Text Block]
Total net gains (losses) included in, Purchases		$ 3,351
Other [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	(12)
Fair value of liabilities, Ending balance	0	(12)
Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	$ 12,227	8,852
Derivative, Gain (Loss) on Derivative, Net		(7,894)
Total net gains (losses) included, in Redemptions and paydowns, Liabilities		(11,956)
Fair value of liabilities, Ending balance	$ 13,514	12,227	8,852
Other Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	(13)	(4,303)
Total net gains (losses) included in, Other noninterest expense	$ 12	228
Fair value of liabilities, Ending balance		$ (13)	$ (4,303)

Fair Value (Schedule Of Realize

Fair Value (Schedule Of Realized Gains (Losses) Using Level 3 Inputs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Dividends And Other Investment Income [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Realized gains (losses) from Level 3 inputs	$ (2)	$ 518
Level 3 Equity securities gains (losses), net [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Realized gains (losses) from Level 3 inputs	(11,311)	0
Fixed Income Securities Gains (Losses), Net [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Realized gains (losses) from Level 3 inputs	$ (137,641)	$ 9,395

Fair Value Fair Value (Summary

Fair Value Fair Value (Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Investment securities	$ 0	$ 401,957

Fair Value (Schedule Of Asse128

Fair Value (Schedule Of Assets With Fair Value Changes On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount of other real estate owned property sold	$ 19,200	$ 41,400
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	(12,039)	(9,776)
Private equity investments, carried at cost [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	10,707	23,454
Gains (losses) from fair value changes	(5,119)	(2,527)
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	2,388	8,034
Gains (losses) from fair value changes	(2,467)	(6,784)
Nonrecurring Fair Value Measurements Asset Totals [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	24,086	50,941
Total gains (losses) from fair value changes measured on nonrecurring basis [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	(19,625)	(19,087)
Level 1 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0	0
Level 1 [Member] | Private equity investments, carried at cost [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0	0
Level 1 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0	0
Level 1 [Member] | Nonrecurring Fair Value Measurements Asset Totals [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0	0
Level 2 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	10,991	19,453
Level 2 [Member] | Private equity investments, carried at cost [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0	0
Level 2 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	2,388	8,034
Level 2 [Member] | Nonrecurring Fair Value Measurements Asset Totals [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	13,379	27,487
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0	0
Fair Value, Inputs, Level 3 [Member] | Private equity investments, carried at cost [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	10,707	23,454
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0	0
Fair Value, Inputs, Level 3 [Member] | Nonrecurring Fair Value Measurements Asset Totals [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	10,707	23,454
Estimated Fair Value [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	$ 10,991	$ 19,453

Fair Value (Schedule Of Carryin

Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	$ 552,088	$ 677,196
Loans and Leases Receivable, Net Amount	40,043,494	39,458,995
Time deposits	2,130,680	2,406,924
Long-term debt (less fair value hedges)	817,348	1,092,282
Fair Value, Inputs, Level 2 [Member] | Carrying Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Time deposits	2,130,680	2,406,924
Foreign deposits	294,391	328,391
Long-term debt (less fair value hedges)	817,348	1,090,778
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Time deposits	2,129,742	2,408,550
Foreign deposits	294,321	328,447
Long-term debt (less fair value hedges)	838,796	1,159,287
Fair Value, Inputs, Level 3 [Member] | Carrying Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	545,648	647,252
Loans and Leases Receivable, Net Amount	40,193,374	39,591,499
Fair Value, Inputs, Level 3 [Member] | Estimated Fair Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	552,088	677,196
Loans and Leases Receivable, Net Amount	$ 39,535,365	$ 39,426,141

Operating Segment Information (

Operating Segment Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015USD ($)BranchesBanks	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)BranchesBanks	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)
Segment Reporting Information [Line Items]
Net interest income	$ 448,833	$ 425,377	$ 423,704	$ 417,346	$ 430,430	$ 416,819	$ 416,284	$ 416,471	$ 1,715,260	$ 1,680,004	$ 1,696,359
Provision for loan losses	22,701	18,262	566	(1,494)	11,587	(54,643)	(54,416)	(610)	40,035	(98,082)	(87,136)
Loans and Leases Receivable, Net of Deferred Income	40,649,542				40,063,658				40,649,542	40,063,658
Deposits	50,374,091				47,848,075				50,374,091	47,848,075
Carrying value, Preferred stock	828,490				1,004,011				828,490	1,004,011
Net interest income after provision for loan losses									1,675,225	1,778,086	1,783,495
Net impairment losses on investment securities					0	0	0	27	0	(27)	(165,134)
Other noninterest income									(11,094)	(7,914)	(17,904)
Noninterest expense	402,776	396,149	404,100	397,461	422,666	438,536	406,027	398,063	1,600,486	1,665,292	1,714,439
Income (loss) before income taxes	147,420	141,779	19,459	143,201	125,573	148,997	189,522	157,331	451,859	621,423	406,432
Income Tax Expense (Benefit)									142,388	222,961	142,977
Net loss applicable to noncontrolling interests									0	0	(336)
Net income (loss)	102,487	$ 100,999	$ 13,960	$ 92,025	81,814	$ 95,888	$ 119,550	$ 101,210	309,471	398,462	263,455
Cash and due from banks	798,319				841,942				798,319	841,942	1,173,057	$ 1,841,277
Assets	$ 59,669,525				57,208,874				$ 59,669,525	57,208,874
Number of community/regional banks operating in distinct geographical areas | Banks	7								7
Total shareholders' equity	$ 7,507,519				7,369,530				$ 7,507,519	7,369,530	6,464,563	$ 6,048,641
Zions Bank [Member]
Segment Reporting Information [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	32,000				11,000				32,000	11,000	0
Net interest income									583,000	581,400	595,000
Provision for loan losses									(28,300)	(58,500)	(40,500)
Money Market Funds, at Carrying Value	1,118,000				3,384,000				1,118,000	3,384,000	3,890,000
Investment and Trading Securities	5,103,000				2,331,000				5,103,000	2,331,000	1,520,000
Loans and Leases Receivable, Net of Deferred Income	12,334,000				12,251,000				12,334,000	12,251,000	12,259,000
Deposits	16,900,000				16,633,000				16,900,000	16,633,000	16,257,000
Carrying value, Preferred stock	280,000				280,000				280,000	280,000	280,000
Average Common Equity	1,693,000				1,615,000				1,693,000	1,615,000	1,523,000
Net interest income after provision for loan losses									611,300	639,900	635,500
Net impairment losses on investment securities									0	0	7,700
Loss on sale of investment securities to Parent									0	0	0
Other noninterest income									(136,300)	(206,400)	(199,900)
Noninterest expense									514,700	494,300	481,400
Income (loss) before income taxes									232,900	352,000	346,300
Income Tax Expense (Benefit)									82,600	130,400	121,700
Income (Loss) from Subsidiaries, Net of Tax									150,300	221,600	224,600
Net loss applicable to noncontrolling interests									900	1,200	0
Net income (loss)									149,400	220,400	224,600
Cash and due from banks	375,000				385,000				375,000	385,000	362,000
Assets	19,744,000				19,079,000				19,744,000	19,079,000	18,590,000
Total shareholders' equity	$ 2,005,000				1,906,000				$ 2,005,000	1,906,000	1,803,000
California Bank Trust [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	94								94
Amegy [Member]
Segment Reporting Information [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	$ 0				0				$ 0	0	0
Net interest income									390,800	412,500	469,000
Provision for loan losses									(4,400)	(20,100)	(16,700)
Money Market Funds, at Carrying Value	1,814,000				1,670,000				1,814,000	1,670,000	1,108,000
Investment and Trading Securities	714,000				296,000				714,000	296,000	331,000
Loans and Leases Receivable, Net of Deferred Income	8,832,000				8,530,000				8,832,000	8,530,000	8,574,000
Deposits	10,520,000				9,707,000				10,520,000	9,707,000	9,328,000
Carrying value, Preferred stock	162,000				162,000				162,000	162,000	162,000
Average Common Equity	1,424,000				1,390,000				1,424,000	1,390,000	1,342,000
Net interest income after provision for loan losses									306,700	354,600	382,300
Net impairment losses on investment securities									0	0	0
Loss on sale of investment securities to Parent									0	0	0
Other noninterest income									(74,100)	(53,900)	(79,300)
Noninterest expense									295,900	321,300	352,400
Income (loss) before income taxes									64,800	137,700	186,000
Income Tax Expense (Benefit)									67,200	63,900	72,500
Income (Loss) from Subsidiaries, Net of Tax									44,800	93,200	127,400
Net loss applicable to noncontrolling interests									0	0	0
Net income (loss)									44,800	93,200	127,400
Cash and due from banks	56,000				85,000				56,000	85,000	157,000
Assets	12,187,000				11,340,000				12,187,000	11,340,000	10,923,000
Total shareholders' equity	$ 2,256,000				2,224,000				$ 2,256,000	2,224,000	2,214,000
Number of Branches | Branches	77								77
California Bank And Trust [Member]
Segment Reporting Information [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	$ 0				0				$ 0	0	0
Net interest income									398,000	386,800	386,500
Provision for loan losses									91,300	32,200	4,200
Money Market Funds, at Carrying Value	2,072,000				2,199,000				2,072,000	2,199,000	2,551,000
Investment and Trading Securities	465,000				277,000				465,000	277,000	362,000
Loans and Leases Receivable, Net of Deferred Income	10,115,000				10,077,000				10,115,000	10,077,000	9,217,000
Deposits	11,634,000				11,491,000				11,634,000	11,491,000	11,199,000
Carrying value, Preferred stock	226,000				226,000				226,000	226,000	226,000
Average Common Equity	2,030,000				1,998,000				2,030,000	1,998,000	1,988,000
Net interest income after provision for loan losses									395,200	432,600	485,700
Net impairment losses on investment securities									0	0	0
Loss on sale of investment securities to Parent									0	0	0
Other noninterest income									(137,900)	(140,400)	(137,000)
Noninterest expense									379,800	357,300	333,300
Income (loss) before income taxes									173,400	165,200	212,600
Income Tax Expense (Benefit)									20,000	44,500	58,600
Income (Loss) from Subsidiaries, Net of Tax									106,200	101,300	140,100
Net loss applicable to noncontrolling interests									0	0	0
Net income (loss)									106,200	101,300	140,100
Cash and due from banks	228,000				219,000				228,000	219,000	407,000
Assets	14,062,000				13,888,000				14,062,000	13,888,000	13,620,000
Total shareholders' equity	1,586,000				1,552,000				1,586,000	1,552,000	1,504,000
NBA [Member]
Segment Reporting Information [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	0				0				0	0	0
Net interest income									160,600	162,000	163,000
Provision for loan losses									7,900	(21,500)	(15,000)
Money Market Funds, at Carrying Value	238,000				371,000				238,000	371,000	221,000
Investment and Trading Securities	601,000				395,000				601,000	395,000	362,000
Loans and Leases Receivable, Net of Deferred Income	3,909,000				3,750,000				3,909,000	3,750,000	3,724,000
Deposits	4,369,000				4,133,000				4,369,000	4,133,000	3,931,000
Carrying value, Preferred stock	85,000				85,000				85,000	85,000	120,000
Average Common Equity	522,000				481,000				522,000	481,000	418,000
Net interest income after provision for loan losses									152,700	183,500	178,000
Net impairment losses on investment securities									0	0	0
Loss on sale of investment securities to Parent									0	0	0
Other noninterest income									(38,600)	(36,000)	(35,000)
Noninterest expense									131,500	145,100	142,700
Income (loss) before income taxes									59,800	74,400	70,300
Income Tax Expense (Benefit)									17,800	27,900	26,400
Income (Loss) from Subsidiaries, Net of Tax									42,000	46,500	43,900
Net loss applicable to noncontrolling interests									0	0	0
Net income (loss)									42,000	46,500	43,900
Cash and due from banks	80,000				51,000				80,000	51,000	77,000
Assets	5,024,000				4,771,000				5,024,000	4,771,000	4,579,000
Total shareholders' equity	$ 607,000				566,000				$ 607,000	566,000	538,000
Number of Branches | Branches	67								67
NSB [Member]
Segment Reporting Information [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	$ 0				0				$ 0	0	0
Net interest income									112,900	112,900	113,600
Provision for loan losses									(28,300)	(20,900)	(12,000)
Money Market Funds, at Carrying Value	1,036,000				655,000				1,036,000	655,000	710,000
Investment and Trading Securities	920,000				831,000				920,000	831,000	774,000
Loans and Leases Receivable, Net of Deferred Income	2,285,000				2,421,000				2,285,000	2,421,000	2,297,000
Deposits	4,035,000				3,690,000				4,035,000	3,690,000	3,590,000
Carrying value, Preferred stock	50,000				50,000				50,000	50,000	50,000
Average Common Equity	330,000				332,000				330,000	332,000	317,000
Net interest income after provision for loan losses									141,200	133,800	125,600
Net impairment losses on investment securities									0	0	3,300
Loss on sale of investment securities to Parent									0	0	0
Other noninterest income									(35,700)	(32,200)	(37,800)
Noninterest expense									129,500	132,800	131,800
Income (loss) before income taxes									47,400	33,200	28,300
Income Tax Expense (Benefit)									15,900	10,900	9,500
Income (Loss) from Subsidiaries, Net of Tax									31,500	22,300	18,800
Net loss applicable to noncontrolling interests									0	0	0
Net income (loss)									31,500	22,300	18,800
Cash and due from banks	54,000				51,000				54,000	51,000	79,000
Assets	4,441,000				4,096,000				4,441,000	4,096,000	3,980,000
Total shareholders' equity	$ 380,000				382,000				$ 380,000	382,000	367,000
Number of Branches | Branches	49								49
Vectra [Member]
Segment Reporting Information [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	$ 0				0				$ 0	0	0
Net interest income									103,700	102,100	102,700
Provision for loan losses									4,700	(8,400)	(4,900)
Money Market Funds, at Carrying Value	475,000				407,000				475,000	407,000	6,000
Investment and Trading Securities	274,000				179,000				274,000	179,000	166,000
Loans and Leases Receivable, Net of Deferred Income	2,468,000				2,320,000				2,468,000	2,320,000	2,278,000
Deposits	2,889,000				2,591,000				2,889,000	2,591,000	2,178,000
Carrying value, Preferred stock	25,000				25,000				25,000	25,000	70,000
Average Common Equity	331,000				315,000				331,000	315,000	246,000
Net interest income after provision for loan losses									99,000	110,500	107,600
Net impairment losses on investment securities									0	0	100
Loss on sale of investment securities to Parent									0	0	0
Other noninterest income									(21,000)	(19,900)	(24,600)
Noninterest expense									97,200	98,300	99,500
Income (loss) before income taxes									22,800	32,100	32,600
Income Tax Expense (Benefit)									7,100	10,700	11,200
Income (Loss) from Subsidiaries, Net of Tax									15,700	21,400	21,400
Net loss applicable to noncontrolling interests									0	0	0
Net income (loss)									15,700	21,400	21,400
Cash and due from banks	32,000				28,000				32,000	28,000	51,000
Assets	3,310,000				2,999,000				3,310,000	2,999,000	2,571,000
Total shareholders' equity	356,000				340,000				356,000	340,000	316,000
TCBW [Member]
Segment Reporting Information [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	0				0				0	0	0
Net interest income									30,200	31,500	30,100
Provision for loan losses									(2,900)	(900)	(2,300)
Money Market Funds, at Carrying Value	349,000				123,000				349,000	123,000	182,000
Investment and Trading Securities	110,000				83,000				110,000	83,000	93,000
Loans and Leases Receivable, Net of Deferred Income	704,000				713,000				704,000	713,000	689,000
Deposits	986,000				816,000				986,000	816,000	845,000
Carrying value, Preferred stock	3,000				3,000				3,000	3,000	3,000
Average Common Equity	116,000				103,000				116,000	103,000	101,000
Net interest income after provision for loan losses									33,100	32,400	32,400
Net impairment losses on investment securities									0	0	0
Loss on sale of investment securities to Parent									0	0	(2,700)
Other noninterest income									(4,800)	(2,500)	(4,600)
Noninterest expense									16,500	33,400	22,200
Income (loss) before income taxes									21,400	1,500	12,100
Income Tax Expense (Benefit)									7,200	500	4,200
Income (Loss) from Subsidiaries, Net of Tax									14,200	1,000	7,900
Net loss applicable to noncontrolling interests									0	0	0
Net income (loss)									14,200	1,000	7,900
Cash and due from banks	22,000				34,000				22,000	34,000	31,000
Assets	1,198,000				970,000				1,198,000	970,000	1,010,000
Total shareholders' equity	$ 119,000				106,000				$ 119,000	106,000	104,000
Number of Branches | Branches	1								1
Other Affiliates [Member]
Segment Reporting Information [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	$ (32,000)				(11,000)				$ (32,000)	(11,000)	0
Net interest income									(63,900)	(109,200)	(163,600)
Provision for loan losses									0	0	100
Money Market Funds, at Carrying Value	(374,000)				(245,000)				(374,000)	(245,000)	(209,000)
Investment and Trading Securities	50,000				170,000				50,000	170,000	717,000
Loans and Leases Receivable, Net of Deferred Income	3,000				2,000				3,000	2,000	5,000
Deposits	(959,000)				(1,213,000)				(959,000)	(1,213,000)	(965,000)
Carrying value, Preferred stock	(2,000)				173,000				(2,000)	173,000	93,000
Average Common Equity	233,000				132,000				233,000	132,000	(474,000)
Net interest income after provision for loan losses									(63,900)	(109,200)	(163,700)
Net impairment losses on investment securities									0	0	154,000
Loss on sale of investment securities to Parent									0	0	2,700
Other noninterest income									(71,300)	(17,300)	(15,700)
Noninterest expense									35,400	82,800	151,100
Income (loss) before income taxes									(170,600)	(174,700)	(481,800)
Income Tax Expense (Benefit)									(75,400)	(65,900)	(161,200)
Income (Loss) from Subsidiaries, Net of Tax									(95,200)	(108,800)	(320,600)
Net loss applicable to noncontrolling interests									(900)	(1,200)	(300)
Net income (loss)									(94,300)	(107,600)	(320,300)
Cash and due from banks	(49,000)				(11,000)				(49,000)	(11,000)	9,000
Assets	(296,000)				66,000				(296,000)	66,000	758,000
Total shareholders' equity	199,000				294,000				199,000	294,000	(381,000)
Consolidated Company [Member]
Segment Reporting Information [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	0				0				0	0	0
Net interest income									1,715,300	1,680,000	1,696,300
Provision for loan losses									40,000	(98,100)	(87,100)
Money Market Funds, at Carrying Value	6,728,000				8,564,000				6,728,000	8,564,000	8,459,000
Investment and Trading Securities	8,237,000				4,562,000				8,237,000	4,562,000	4,325,000
Loans and Leases Receivable, Net of Deferred Income	40,650,000				40,064,000				40,650,000	40,064,000	39,043,000
Deposits	50,374,000				47,848,000				50,374,000	47,848,000	46,363,000
Carrying value, Preferred stock	829,000				1,004,000				829,000	1,004,000	1,004,000
Average Common Equity	6,679,000				6,366,000				6,679,000	6,366,000	5,461,000
Net interest income after provision for loan losses									1,675,300	1,778,100	1,783,400
Net impairment losses on investment securities									0	0	165,100
Loss on sale of investment securities to Parent									0	0	0
Other noninterest income									(377,100)	(508,600)	(502,500)
Noninterest expense									1,600,500	1,665,300	1,714,400
Income (loss) before income taxes									451,900	621,400	406,400
Income Tax Expense (Benefit)									142,400	222,900	142,900
Income (Loss) from Subsidiaries, Net of Tax									309,500	398,500	263,500
Net loss applicable to noncontrolling interests									0	0	(300)
Net income (loss)									309,500	398,500	263,800
Cash and due from banks	798,000				842,000				798,000	842,000	1,173,000
Assets	59,670,000				57,209,000				59,670,000	57,209,000	56,031,000
Total shareholders' equity	$ 7,508,000				$ 7,370,000				$ 7,508,000	$ 7,370,000	$ 6,465,000
The Commerce Bank Of Oregon [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1								1
Utah [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	99								99
Idaho [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	24								24
WYOMING | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1								1
Colorado [Member] | Vectra [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	36								36
New Mexico [Member] | Vectra [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1								1

Quarterly Financial Informat131

Quarterly Financial Information (Financial Information By Quarter) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Gross interest income	$ 473,559	$ 456,230	$ 455,236	$ 448,446	$ 461,960	$ 460,276	$ 463,192	$ 467,574	$ 1,833,471	$ 1,853,002	$ 1,941,436
Net interest income	448,833	425,377	423,704	417,346	430,430	416,819	416,284	416,471	1,715,260	1,680,004	1,696,359
Provision for loan losses	22,701	18,262	566	(1,494)	11,587	(54,643)	(54,416)	(610)	40,035	(98,082)	(87,136)
Net impairment losses on investment securities					0	0	0	27	0	(27)	(165,134)
Investment securities gains (losses), net	46	3,577	(133,597)	3,114	(2,014)	(13,461)	7,539	31,826	(126,860)	23,890
Other noninterest income	124,018	127,236	134,018	118,708	131,410	129,532	117,310	106,514	503,980	484,766
Noninterest expense	402,776	396,149	404,100	397,461	422,666	438,536	406,027	398,063	1,600,486	1,665,292	1,714,439
Income before income taxes	147,420	141,779	19,459	143,201	125,573	148,997	189,522	157,331	451,859	621,423	406,432
Net income (loss)	102,487	100,999	13,960	92,025	81,814	95,888	119,550	101,210	309,471	398,462	263,455
Net income (loss) applicable to controlling interest									309,471	398,462	263,791
Preferred stock dividends	(14,290)	(16,761)	(15,060)	(16,746)	(15,053)	(16,761)	(15,060)	(25,020)	(62,857)	(71,894)	(95,512)
Preferred stock redemption									0	0	125,700
Net earnings applicable to common shareholders	$ 88,197	$ 84,238	$ (1,100)	$ 75,279	$ 66,761	$ 79,127	$ 104,490	$ 76,190	$ 246,614	$ 326,568	$ 293,979
Basic, per share	$ 0.43	$ 0.41	$ (0.01)	$ 0.37	$ 0.33	$ 0.40	$ 0.56	$ 0.41	$ 1.20	$ 1.68	$ 1.58
Diluted	$ 0.43	$ 0.41	$ (0.01)	$ 0.37	$ 0.33	$ 0.40	$ 0.56	$ 0.41	$ 1.20	$ 1.68	$ 1.58

Parent Company Financial Inf132

Parent Company Financial Information (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Jul. 28, 2014	Dec. 31, 2013	Dec. 31, 2012
Held-to-maturity, fair value	$ 552,088	$ 677,196
Cash and due from banks	798,319	841,942		$ 1,173,057	$ 1,841,277
Interest-bearing deposits	6,108,124	7,178,097
Held-to-maturity Securities	545,648	647,252
Available-for-sale, at fair value	7,643,116	3,844,248
Other noninterest-bearing investments	848,144	865,950
Other assets	921,919	894,620
Total assets	59,669,525	57,208,874
Other liabilities	548,742	573,688
Long-term debt	817,348	1,092,282
Total liabilities	52,162,006	49,839,344
Preferred stock	828,490	1,004,011
Common Stock	4,766,731	4,723,855	$ 525,000
Retained earnings	1,966,910	1,769,705
Accumulated Other Comprehensive Income (Loss), Net of Tax	(54,612)	(128,041)		(192,101)
Total shareholders' equity	7,507,519	7,369,530		6,464,563	6,048,641
Total liabilities and shareholders' equity	59,669,525	57,208,874
Allowance for loan losses	606,048	604,663		746,291
Parent Company [Member]
Cash and due from banks	18,375	23,774		$ 903,078	$ 5,195
Interest-bearing deposits	775,649	1,007,916
Security Resell Agreements Amount Outstanding	100,000	0
Held-to-maturity Securities	0	17,292
Available-for-sale, at fair value	45,168	130,964
Other noninterest-bearing investments	28,178	33,577
Receivables From Subsidiaries, Others	60	15,060
Other assets	83,710	106,233
Total assets	8,447,804	8,524,094
Other liabilities	123,849	85,480
Subordinated debt to affiliated trusts	164,950	168,043
Total liabilities	940,285	1,154,564
Preferred stock	828,490	1,004,011
Common Stock	4,766,731	4,723,855
Retained earnings	1,966,910	1,769,705
Accumulated Other Comprehensive Income (Loss), Net of Tax	(54,612)	(128,041)
Total shareholders' equity	7,507,519	7,369,530
Total liabilities and shareholders' equity	8,447,804	8,524,094
Parent Company [Member] | Due To Others [Member]
Long-term debt	651,486	901,021
Parent Company [Member] | Due To Affiliates [Member]
Long-term debt	0	20
Parent Company [Member] | Other Operating Companies [Member]
Investments in subsidiaries	84,010	94,681
Parent Company [Member] | Commercial Banks And Bank Holding Company [Member]
Investments in subsidiaries	$ 7,312,654	$ 7,094,597

Parent Company Financial Inf133

Parent Company Financial Information (Condensed Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other loans and securities									$ 1,686,220	$ 1,729,652	$ 1,814,631
Total interest income	$ 473,559	$ 456,230	$ 455,236	$ 448,446	$ 461,960	$ 460,276	$ 463,192	$ 467,574	1,833,471	1,853,002	1,941,436
Total interest expense									118,211	172,998	245,077
Net interest loss	(448,833)	(425,377)	(423,704)	(417,346)	(430,430)	(416,819)	(416,284)	(416,471)	(1,715,260)	(1,680,004)	(1,696,359)
Provision for loan losses	(22,701)	(18,262)	(566)	1,494	(11,587)	54,643	54,416	610	(40,035)	98,082	87,136
Net interest loss after provision for loan losses									1,675,225	1,778,086	1,783,495
Net impairment losses on investment securities					0	0	0	27	0	(27)	(165,134)
Other income (loss)									(11,094)	(7,914)	(17,904)
Total noninterest income									377,120	508,629	337,376
Salaries and employee benefits									972,712	956,411	912,902
Total noninterest expense	402,776	396,149	404,100	397,461	422,666	438,536	406,027	398,063	1,600,486	1,665,292	1,714,439
Income taxes (benefit)									142,388	222,961	142,977
Preferred stock dividends	(14,290)	(16,761)	(15,060)	(16,746)	(15,053)	(16,761)	(15,060)	(25,020)	(62,857)	(71,894)	(95,512)
Net earnings applicable to common shareholders	$ 88,197	$ 84,238	$ (1,100)	$ 75,279	$ 66,761	$ 79,127	$ 104,490	$ 76,190	246,614	326,568	293,979
Parent Company [Member]
Commercial bank subsidiaries									1,162	1,489	862
Other subsidiaries and affiliates									3	16	0
Other loans and securities									3,014	10,900	17,764
Total interest income									4,179	12,405	18,626
Affiliated trusts									4,308	4,265	12,202
Other borrowed funds									63,665	117,700	172,480
Total interest expense									67,973	121,965	184,682
Net interest loss									63,794	109,560	166,056
Provision for loan losses									0	0	23
Net interest loss after provision for loan losses									(63,794)	(109,560)	(166,033)
Equity and fixed income securities gains (losses), net									37,161	300,275	(7,332)
Net impairment losses on investment securities									0	0	95,637
Other income (loss)									(12,512)	(6,475)	(8,285)
Total noninterest income									283,626	543,162	310,352
Salaries and employee benefits									24,674	17,457	26,014
Extinguishment of Debt, Amount									135	44,422	120,192
Other operating expenses									10,473	10,559	1,436
Total noninterest expense									35,282	72,438	147,642
Income (loss) before income taxes and undistributed income (loss) of consolidated subsidiaries									184,550	361,164	(3,323)
Income taxes (benefit)									(27,140)	55,865	(135,472)
Income before equity in undistributed income (loss) of consolidated subsidiaries									211,690	305,299	132,149
Net Income (Loss) Attributable to Parent									309,471	398,462	263,791
Preferred stock dividends									(62,857)	(71,894)	(95,512)
Preferred stock redemption									0	0	125,700
Net earnings applicable to common shareholders									246,614	326,568	293,979
Parent Company [Member] | Other Operating Companies [Member]
Dividends from consolidated subsidiaries									100	400	200
Equity in undistributed income (loss) of consolidated subsidiaries									(10,569)	(4,510)	2,080
Parent Company [Member] | Commercial Banks And Bank Holding Company [Member]
Dividends from consolidated subsidiaries									233,853	236,012	421,406
Equity in undistributed income (loss) of consolidated subsidiaries									$ 108,350	$ 97,673	$ 129,562

Parent Company Financial Inf134

Parent Company Financial Information (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income (loss) applicable to controlling interest	$ 309,471	$ 398,462	$ 263,791
Net cash used in operating activities	535,169	454,321	835,107
Other, net	(48,919)	(34,916)	(22,895)
Net cash provided by (used in) investing activities	(2,650,718)	(1,342,542)	(1,352,995)
Net change in short-term funds borrowed	102,764	(96,125)	(12,274)
Proceeds from issuance of long-term debt	0	0	646,408
Repayments of long-term debt	(287,752)	(1,223,275)	(832,122)
Debt Extinguishment Costs Paid	(2,530)	(35,435)	(45,812)
Other, net	(5,240)	(3,559)	(10,252)
Net cash provided by (used in) financing activities	2,071,926	557,106	(150,332)
Net increase (decrease) in cash and due from banks	(43,623)	(331,115)	(668,220)
Cash and Due From Banks - Beginning of Year	798,319	841,942	1,173,057	$ 1,841,277
Interest paid	101,623	152,783	191,897
Asset Impairment Charges	250	27	165,134
Other Noncash Income (Expense)	14,355	20,291	5,223
Parent Company [Member]
Net income (loss) applicable to controlling interest	309,471	398,462	263,791
Undistributed net losses (income) of consolidated subsidiaries	97,781	93,163	131,642
Net cash used in operating activities	290,405	499,001	417,372
Net decrease (increase) in interest-bearing deposits	132,267	(1,007,844)	650,736
Collection of advances to subsidiaries	56,000	15,000	10,000
Advances to subsidiaries	41,000	30,060	10,000
Proceeds from Sale and Maturity of Marketable Securities	124,419	372,357	27,916
Purchases of investment securities	46,851	0	4,858
Decrease (increase) of investment in subsidiaries	15,000	6,310	175,000
Other, net	4,010	24,319	10,642
Net cash provided by (used in) investing activities	243,845	(619,918)	859,436
Net change in short-term funds borrowed	0	0	(3,368)
Proceeds from issuance of long-term debt	0	0	646,408
Repayments of long-term debt	271,120	1,147,641	835,031
Debt Extinguishment Costs Paid	(135)	(35,435)	(45,812)
Proceeds from issuance of preferred stock	0	0	784,318
Proceeds from issuance of common stock and warrants	22,392	526,438	9,825
Cash paid for preferred stock redemption	175,669	0	799,468
Dividends paid on preferred stock	(62,857)	(64,868)	(95,512)
Dividends paid on common stock	45,198	31,262	24,148
Other, net	(7,062)	(5,619)	(16,137)
Net cash provided by (used in) financing activities	(539,649)	(758,387)	(378,925)
Net increase (decrease) in cash and due from banks	(5,399)	(879,304)	897,883
Cash and Due From Banks - Beginning of Year	18,375	23,774	903,078	$ 5,195
Interest paid	51,400	100,600	130,900
Asset Impairment Charges	0	0	95,637
Extinguishment of Debt, Amount	135	44,422	120,192
Other Noncash Income (Expense)	$ 78,580	$ 149,280	$ 69,394

Uncategorized Items - zion-2015

Label	Element	Value
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	$ 98,000
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	80,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	264,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	(332,000)
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	102,000
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	445,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	93,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	98,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	264,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	(332,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities	us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	(1,067,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities	us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	(954,000)
Pension Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	10,373,000
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	9,876,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	(60,581,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	(60,067,000)
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	10,702,000
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	53,028,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	10,307,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	10,253,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	(60,581,000)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	(60,067,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities	us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	(15,745,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities	us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	(15,890,000)
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	838,000
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	1,870,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	(2,637,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	(2,288,000)
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	819,000
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	3,459,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	845,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	871,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	(2,637,000)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	(2,288,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities	us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	(10,595,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities	us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	$ (9,994,000)