Zions Bancorporation, National Association (ZION) 10-K 28 Feb 17 2016 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 13, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
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			$ 8,648,868,202
Entity Common Stock, Shares Outstanding		202,422,704

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 737,327	$ 798,319
Money market investments:
Interest-bearing deposits	1,410,852	6,108,124
Federal funds sold and security resell agreements	568,334	619,758
Investment securities:
Held-to-maturity, at adjusted cost (approximate fair value $850,473 and $552,088)	867,904	545,648
Available-for-sale, at fair value	13,372,194	7,643,116
Trading account, at fair value	114,803	48,168
Marketable securities, total	14,354,901	8,236,932
Loans held for sale	171,934	149,880
Loans, net of allowance
Total loans, net of unearned income and fees	42,649,265	40,649,542
Less allowance for loan losses	567,522	606,048
Loans, net of allowance	42,081,743	40,043,494
Other noninterest-bearing investments	884,407	848,144
Premises and equipment, net	1,019,508	905,462
Goodwill	1,014,129	1,014,129
Core deposit and other intangibles	8,420	16,272
Other real estate owned	4,255	7,092
Other assets	983,355	916,937
Total assets	63,239,165	59,664,543
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing demand	24,115,112	22,276,664
Interest-bearing:
Savings and Money Market	26,363,908	25,672,356
Time	2,756,810	2,130,680
Foreign	0	294,391
Total deposits	53,235,830	50,374,091
Federal funds and other short-term borrowings	827,269	346,987
Long-term debt	534,850	812,366
Reserve for unfunded lending commitments	64,911	74,838
Other liabilities	941,999	548,742
Total liabilities	55,604,859	52,157,024
Shareholders' equity:
Preferred stock, without par value, authorized 4,400,000 shares	709,601	828,490
Common stock, without par value; authorized 350,000,000 shares; issued and outstanding 203,085,100 and 204,417,093 shares	4,724,715	4,766,731
Retained earnings	2,321,571	1,966,910
Accumulated Other Comprehensive Income (Loss)	(121,581)	(54,612)
Total shareholders' equity	7,634,306	7,507,519
Total liabilities and shareholders' equity	$ 63,239,165	$ 59,664,543

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Held-to-maturity, fair value	$ 850,473	$ 552,088
Preferred stock, authorized shares	4,400,000	4,400,000
Common stock, authorized shares	350,000,000	350,000,000
Common stock, issued shares	203,085,100	204,417,093
Common stock, outstanding shares	203,085,100	204,417,093

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income:
Interest and fees on loans	$ 1,728,706	$ 1,686,220	$ 1,729,652
Interest on money market investments	21,688	23,165	21,414
Interest on securities	203,920	124,086	101,936
Total interest income	1,954,314	1,833,471	1,853,002
Interest expense:
Interest on deposits	49,247	49,344	49,736
Interest on short- and long-term borrowings	37,719	68,867	123,262
Total interest expense	86,966	118,211	172,998
Net interest income	1,867,348	1,715,260	1,680,004
Provision for loan losses	92,775	40,035	(98,082)
Net interest income after provision for loan losses	1,774,573	1,675,225	1,778,086
Noninterest income:
Service charges and fees on deposit accounts	171,185	168,451	168,291
Other service charges, commissions and fees	207,666	186,907	178,053
Wealth management income	37,434	31,224	30,573
Loan sales and servicing income	35,466	30,731	29,154
Capital markets and foreign exchange	21,713	25,655	22,584
Dividends and other investment income	24,053	30,150	43,662
Fair value and nonhedge derivative loss	2,206	(111)	(11,390)
Equity securities gains, net	7,168	11,875	13,471
Fixed income securities gains (losses), net	102	(138,735)	10,419
Impairment losses on investment securities:
Impairment losses on investment securities	0	0	(27)
Less amounts recognized in other comprehensive income	0	0	0
Net impairment losses on investment securities	0	0	(27)
Other	8,616	11,094	7,914
Total noninterest income	515,609	357,241	492,704
Noninterest expense:
Salaries and employee benefits	982,531	972,712	956,411
Occupancy, net	125,273	119,529	115,701
Furniture, equipment, and software	124,677	123,196	115,312
Other real estate expense	(1,597)	(647)	(1,251)
Credit-related expense	25,671	28,541	28,134
Provision for unfunded lending commitments	(9,927)	(6,238)	(8,629)
Professional and Legal services	55,094	50,421	66,011
Advertising	22,143	25,314	25,100
FDIC premiums	39,675	34,422	32,174
Amortization of core deposit and other intangibles	7,853	9,247	10,923
Debt extinguishment cost	(353)	(2,530)	(44,422)
Other	213,528	221,580	265,059
Total noninterest expense	1,585,274	1,580,607	1,649,367
Income before income taxes	704,908	451,859	621,423
Income taxes	235,858	142,388	222,961
Net income	469,050	309,471	398,462
Preferred stock dividends	(47,982)	(62,857)	(71,894)
Preferred stock redemption	(9,759)	0	0
Net earnings applicable to common shareholders	$ 411,309	$ 246,614	$ 326,568
Weighted average common shares outstanding during the period:
Basic shares	203,855	203,265	192,207
Diluted shares	204,269	203,698	192,789
Net earnings per common share:
Basic, per share	$ 2	$ 1.20	$ 1.68
Diluted, per share	$ 1.99	$ 1.20	$ 1.68

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 469,050	$ 309,471	$ 398,462
Other comprehensive income, net of tax:
Net unrealized Holding Gains (Losses) on Investment Securities	(73,985)	(23,409)	82,204
Reclassification of HTM securities to AFS securities	0	10,938	0
Reclassification to earnings for realized net fixed income securities losses (gains)	(63)	86,023	(6,447)
Reclassification to earnings for net credit-related impairment losses on investment securities	0	0	17
Accretion of securities with noncredit-related impairment losses not expected to be sold	0	0	1,111
Net unrealized losses on other noninterest-bearing investments	2,100	(2,552)	(390)
Net unrealized holding gains (losses) on derivative instruments	4,993	7,455	2,664
Reclassification adjustment for increase in interest income recognized in earnings on derivative instruments	(7,000)	(5,583)	(1,605)
Pension and postretirement	6,986	557	(13,494)
Other comprehensive income	(66,969)	73,429	64,060
Comprehensive income	$ 402,081	$ 382,900	$ 462,522

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]
Balance at Dec. 31, 2013	$ 6,464,563	$ 1,003,970	$ 4,179,024	$ 1,473,670	$ (192,101)
Balance (in shares) at Dec. 31, 2013			184,677,696
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	398,462			398,462
Other comprehensive income (loss)	64,060				64,060
Stock Issued During Period, Value, New Issues			$ 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)
Balance (in shares) at Dec. 31, 2014			203,014,903
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	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)
Balance (in shares) at Dec. 31, 2015	204,417,093		204,417,093
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 469,050			469,050
Other comprehensive income (loss)	(66,969)				(66,969)
Preferred stock redemption	$ (126,144)	(118,889)	$ 2,504	(9,759)
Stock Repurchased During Period, Shares	2,890,000		(2,888,946)
Stock Repurchased and Retired During Period, Value	$ (90,057)		$ (90,057)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures			1,556,953
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	45,537		$ 45,537
Dividends on preferred stock	(47,982)			(47,982)
Dividends on common stock	(57,677)			(57,677)
Increase (Decrease) in Deferred Compensation	1,029			1,029
Balance at Dec. 31, 2016	$ 7,634,306	$ 709,601	$ 4,724,715	$ 2,321,571	$ (121,581)
Balance (in shares) at Dec. 31, 2016	203,085,100		203,085,100

Consolidated Statements Of Cha7

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 469,050	$ 309,471	$ 398,462
Adjustments to reconcile net income to net cash provided by operating activities:
Debt extinguishment cost	(353)	(2,530)	(44,422)
Provision for credit losses	82,848	33,797	(106,711)
Depreciation and amortization	123,086	85,878	57,691
Fixed income securities gains (losses), net	(102)	138,735	(10,419)
Deferred income tax expense (benefit)	(8,442)	(29,803)	25,938
Net decrease (increase) in trading securities	(66,635)	22,453	(36,045)
Net decrease (increase) in loans held for sale	972	(5,978)	38,610
Change in other liabilities	1,194	(5,759)	42,636
Change in other assets	(9,609)	(67,260)	(50,956)
Other, net	3,352	(19,712)	(23,287)
Net cash provided by operating activities	596,067	464,352	380,341
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	4,748,696	1,836,506	(105,066)
Proceeds from maturities and paydowns of investment securities held-to-maturity	93,306	123,178	108,404
Purchases of investment securities held-to-maturity	(415,654)	(61,036)	(164,704)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	3,787,309	1,681,280	1,779,327
Purchases of investment securities available-for-sale	(9,358,633)	(5,513,366)	(1,794,525)
Net change in loans and leases	(2,101,518)	(562,827)	(1,005,171)
Purchases of premises and equipment	(195,663)	(157,361)	(175,799)
Proceeds from sales of other real estate owned	20,146	24,806	54,056
Other, net	14,243	(48,919)	(34,916)
Net cash used in investing activities	(3,436,254)	(2,579,901)	(1,268,562)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	2,883,322	2,526,016	1,485,192
Net change in short-term funds borrowed	480,282	102,764	(96,125)
Repayments of long-term debt	(280,120)	(287,752)	(1,223,275)
Debt Extinguishment Costs Paid	(353)	(2,530)	(35,435)
Payments for Repurchase of Common Stock	(97,240)	(6,681)	(5,589)
Cash paid for preferred stock redemption	(126,144)	(175,669)	0
Proceeds from Issuances of common and preferred stock	25,072	22,392	526,438
Dividends paid on common and preferred stock	(107,851)	(108,055)	(96,130)
Other, net	2,227	1,441	2,030
Net cash provided by financing activities	2,779,195	2,071,926	557,106
Net decrease in cash and due from banks	(60,992)	(43,623)	(331,115)
Cash and due from banks at beginning of period	798,319	841,942	1,173,057
Cash and due from banks at end of period	737,327	798,319	841,942
Cash paid for interest	83,338	101,623	152,783
Net cash paid for income taxes	$ 214,300	$ 131,665	$ 182,954

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
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 owns and operates a commercial bank. The Parent and its subsidiaries (collectively “the Company”) provide a full range of banking and related services in 11 Western and Southwestern states through seven separately managed and branded units as follows: Zions Bank, in Utah, Idaho and Wyoming; California Bank & Trust (“CB&T”); Amegy Bank (“Amegy”), in Texas; National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“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 The consolidated financial statements include the accounts of the Parent and its majority-owned subsidiaries (“the Company,” “we,” “our,” “us”). Unconsolidated investments where we have the ability to exercise significant influence over the operating and financial policies of the respective investee are accounted for using the equity method of accounting; those that are not consolidated or accounted for using the equity method of accounting are accounted for under cost or fair value 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. 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, 2016 and 2015 , 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, 2016 , we held $347 million of securities for which we were permitted by contract to sell or repledge. Security resell agreements averaged $464 million during 2016 , and the maximum amount outstanding at any month-end during 2016 was $2.2 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. 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. We evaluate loans throughout their lives for signs of credit deterioration, which may impact the loan’s status, and potentially impact our accounting for that loan. Loan status categories include past due as to contractual payments, nonaccrual, impaired, and restructured (including trouble debt restructurings “TDRs”). Our accounting policies for these loan statuses and our estimation of the related allowance for loan losses (“ALLL”) 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 ALLL and the reserve for unfunded lending commitments (“RULC”), 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 fair value. 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 (“CSVs”) 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, Equipment and Software, Net Premises, equipment and software, 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 Core Transformation project to install 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 ALLL. 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 (“RSUs”), 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, RSUs, and stock warrants are converted to common stock equivalents using the treasury stock 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, 2016
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 2016-09, Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting The standard requires entities to recognize the income tax effects of share-based awards in the income statement when the awards vest or are settled (i.e. the additional paid-in capital pools will be eliminated). The guidance on employers’ accounting for an employee’s use of shares to satisfy the employer’s statutory income tax withholding obligation and for forfeitures is changing. The standard also provides an entity the option to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. January 1, 2017 We plan to account for forfeitures when they occur. The cumulative effect adjustment of this election and the other requirements of the ASU are not expected to have a material impact 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: January 1, 2018 We do not expect this guidance will have a material impact on the Company’s financial statements. We do not have a significant amount of equity securities classified as AFS. Additionally, we do not have any financial liabilities accounted for under the fair value option. Therefore, the transition adjustment upon adoption of this guidance is not expected to be material. We have formed a working group to evaluate the fair value measurements of financial instruments for disclosure purposes. ASU 2014-09, Revenue from Contracts with Customers (Topic 606) and subsequent related ASUs The core principle of the new guidance 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, these new standards affect 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. Additionally, the new guidance significantly increases the disclosures related to revenue recognition practices. January 1, 2018 More than 75% of our revenue comes from net interest income, and is explicitly out of scope of the guidance. For our noninterest income, approximately 20% is out of scope of the guidance. The contracts that are in scope of the guidance are primarily related to service charges and fees on deposit accounts, wealth management income, and other service charges, commissions and fees. We have created an implementation team that is analyzing the individual contracts in scope to determine if our current accounting will change. This review is expected to be complete in the second quarter of 2017. We plan to adopt this guidance using the modified retrospective transition method. Standard Description Date of adoption Effect on the financial statements Standards not yet adopted by the Company (continued) 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. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. 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 guidance on the Company’s financial statements. As of December 31, 2016, the Company had minimum noncancelable operating lease payments of $275 million that are being evaluated. The implementation team is working on gathering all key lease data elements to meet the requirements of the new guidance. Additionally, we are implementing new lease software that will accommodate the new accounting requirements. ASU 2016-13, Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments The standard significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The standard replaces today’s “incurred loss” approach with an “expected loss” model for instruments such as loans and HTM securities that are measured at amortized cost. The standard requires credit losses relating to AFS debt securities to be recorded through an ACL rather than a reduction of the carrying amount. It also changes the accounting for purchased credit-impaired debt securities and loans. The standard retains many of the current disclosure requirements in current GAAP and expands certain disclosure requirements. Early adoption of the guidance is permitted as of January 1, 2019. January 1, 2020 We have formed an implementation team led jointly by Credit and the Corporate Controller’s group, that also includes other lines of business and functions within the Company. The implementation team is working on developing models that can meet the requirements of the new guidance. While we expect this standard will have a material impact on the Company’s financial statements, we are still in process of conducting our evaluation. ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment The standard eliminates the requirement to calculate the implied fair value of goodwill (i.e. Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, entities would record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current guidance). The standard does not change the guidance on completing Step 1 of the goodwill impairment test. The standard also continues to allow entities to perform the optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The standard is effective for the Company as of January 1, 2020. Early adoption is allowed for any goodwill impairment test performed after January 1, 2017. January 1, 2020 We do not currently expect this guidance will have a material impact on the Company’s financial statements since the fair values of our reporting units were not lower than their respective carrying amounts at the time of our goodwill impairment analysis for 2016. Standard Description Date of adoption Effect on the financial statements Standards adopted by the Company ASU 2014-15, Presentation of Financial Statements (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern The standard requires management to evaluate conditions or events, considered in the aggregate, that raise substantial doubts about the entity’s ability to continue as a going concern within one year after the date the financial statements are issued. The analysis must be completed for each annual and interim reporting period. Disclosure must be made if management’s evaluation reveals substantial doubt. January 1, 2016 Our adoption of this standard did not have a material impact on the accompanying financial statements. ASU 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis The new standard changes certain criteria in the variable interest model and the voting model to determine whether certain legal entities are 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. January 1, 2016 We do not currently consolidate any VIEs and our adoption of this standard did not have a material impact on the Company’s financial statements. ASU 2015-03, Interest – Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs 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. January 1, 2016 Our adoption of this standard did not have a material impact on the accompanying financial statements. ASU 2015-05, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement 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. January 1, 2016 We adopted this standard on a prospective basis and it did not have a material impact on the accompanying financial statements. ASU 2015-07, Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or its Equivalent) 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. January 1, 2016 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, 2016
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, 2016 2015 2014 Loans held for investment transferred to other real estate owned $ 14,632 $ 11,924 $ 25,189 Loans held for investment reclassified to (from) loans held for sale, net 50,353 5,048 (26,272 ) Adjusted cost of HTM securities reclassified as AFS securities — 79,276 — AFS securities purchased, not settled 395,079 — — Prior period amounts in the Consolidated Statements of Cash Flows have been adjusted to reflect a reclassification of certain items. These reclassifications resulted in a decrease in net cash provided by operating activities of $70.8 million and $74.0 million in 2015 and 2014, respectively. Net cash used in investing decreased by the same amounts.

Offsetting Assets and Liabiliti

Offsetting Assets and Liabilities	12 Months Ended
	Dec. 31, 2016
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, 2016 (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 $ 568,334 $ — $ 568,334 $ — $ — $ 568,334 Derivatives (included in other assets) 64,195 — 64,195 (17,118 ) (162 ) 46,915 $ 632,529 $ — $ 632,529 $ (17,118 ) $ (162 ) $ 615,249 Liabilities: Federal funds and other short-term borrowings $ 827,269 $ — $ 827,269 $ — $ — $ 827,269 Derivatives (included in other liabilities) 59,221 — 59,221 (17,118 ) (16,570 ) 25,533 $ 886,490 $ — $ 886,490 $ (17,118 ) $ (16,570 ) $ 852,802 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 (6,990 ) 70,648 $ 697,396 $ — $ 697,396 $ (6,990 ) $ — $ 690,406 Liabilities: Federal funds and other short-term borrowings $ 346,987 $ — $ 346,987 $ — $ — $ 346,987 Derivatives (included in other liabilities) 72,568 — 72,568 (6,990 ) (60,923 ) 4,655 $ 419,555 $ — $ 419,555 $ (6,990 ) $ (60,923 ) $ 351,642 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, 2016
Investments [Abstract]
Investment Securities	INVESTMENTS Investment Securities Securities are classified as HTM, AFS or trading. HTM securities, which management has the intent and ability to hold until maturity, are carried at amortized cost. AFS securities are carried at fair value and unrealized gains and losses are reported as net increases or decreases to accumulated other comprehensive income (“AOCI”). Trading securities are carried at fair value with gains and losses recognized in current period earnings. The purchase premiums and discounts for both HTM and AFS securities are amortized and accreted at a constant effective yield to the contractual maturity date and no assumption is made concerning prepayments. As principal prepayments occur, the portion of the unamortized premium or discount associated with the principal reduction is recognized as interest income in the period the principal is reduced. Note 20 discusses the process to estimate fair value for investment securities. December 31, 2016 (In thousands) Amortized cost Gross unrealized gains Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 867,904 $ 5,975 $ 23,406 $ 850,473 Available-for-sale U.S. Government agencies and corporations: Agency securities 1,845,825 2,338 9,188 1,838,975 Agency guaranteed mortgage-backed securities 7,985,630 6,596 109,392 7,882,834 Small Business Administration loan-backed securities 2,297,935 8,439 18,507 2,287,867 Municipal securities 1,181,560 969 28,319 1,154,210 Other debt securities 25,359 103 1,570 23,892 13,336,309 18,445 166,976 13,187,778 Money market mutual funds and other 184,407 9 — 184,416 13,520,716 18,454 166,976 13,372,194 Total $ 14,388,620 $ 24,429 $ 190,382 $ 14,222,667 December 31, 2015 (In thousands) Amortized Gross Gross Estimated 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 Collateralized Debt Obligation Securities - 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. Maturities The amortized cost and estimated fair value of investment debt securities are shown subsequently as of December 31, 2016 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 $ 181,416 $ 181,686 $ 1,548,685 $ 1,532,345 Due after one year through five years 276,753 276,470 4,971,404 4,920,537 Due after five years through ten years 198,667 195,541 4,305,373 4,251,664 Due after ten years 211,068 196,776 2,510,847 2,483,232 $ 867,904 $ 850,473 $ 13,336,309 $ 13,187,778 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, 2016 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 $ 15,754 $ 467,056 $ 7,652 $ 61,389 $ 23,406 $ 528,445 Available-for-sale U.S. Government agencies and corporations: Agency securities 8,682 949,608 506 127,249 9,188 1,076,857 Agency guaranteed mortgage-backed securities 102,524 6,649,246 6,868 326,417 109,392 6,975,663 Small Business Administration loan-backed securities 2,490 527,472 16,017 840,535 18,507 1,368,007 Municipal securities 28,077 991,973 242 9,103 28,319 1,001,076 Other — — 1,570 13,433 1,570 13,433 141,773 9,118,299 25,203 1,316,737 166,976 10,435,036 Mutual funds and other — — — — — — 141,773 9,118,299 25,203 1,316,737 166,976 10,435,036 Total $ 157,527 $ 9,585,355 $ 32,855 $ 1,378,126 $ 190,382 $ 10,963,481 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 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 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 At December 31, 2016 and 2015 , respectively, 642 and 187 HTM and 2,398 and 709 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 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, 2016 : 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, or the Federal Home Loan Mortgage Corporation. 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, 2016 , we did not have an intent to sell identified securities with unrealized losses or initiate such sales, and we believe it is not more likely than not we would be required to sell such securities before recovery of their amortized cost basis. Therefore, we did not record OTTI for these securities during 2016 . Small Business Administration 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 small business administration (“SBA”). Unrealized losses relate to changes in interest rates subsequent to purchase and are not attributable to credit. At December 31, 2016 , we did not have an intent to sell identified SBA securities with unrealized losses or initiate such sales, and we believe it is not more likely than not we would be required to sell such securities before recovery of their amortized cost basis. Therefore, we did not record OTTI for these securities during 2016 . Municipal Securities: These securities were fixed or variable-rate securities purchased at premiums or at par and with maturities from 1 to 30 years. Unrealized losses may relate to changes in interest rates subsequent to purchase and/or may be attributable to credit. Securities with significant credit deterioration and fair value declines are subject to further assessment for impairment including analysis of the creditworthiness of the issuer. We take into account all available information relevant to the collectability of municipal security, including the extent and nature of change in fair value; recent events specific to the issuer; current analysts’ evaluations; and other key measures. At December 31, 2016 , we did not have an intent to sell identified securities with unrealized losses or initiate such sales, and we believe it is not more likely than not we would be required to sell such securities before recovery of their amortized cost basis. Therefore, we did not record OTTI for these securities during 2016 . The following is a tabular rollforward of the total amount of credit-related OTTI, including amounts recognized in earnings: (In thousands) 2016 2015 HTM AFS Total HTM AFS Total Balance of credit-related OTTI at beginning of year $ — $ — $ — $ (9,079 ) $ (95,472 ) $ (104,551 ) Transfers from HTM to AFS — — — 9,079 (9,079 ) — Reductions for securities sold or paid off during the year — — — — 104,551 104,551 Balance of credit-related OTTI at end of year $ — $ — $ — $ — $ — $ — 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. The following summarizes gains and losses, including OTTI, that were recognized in the statement of income: 2016 2015 2014 (In thousands) Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Investment securities: Held-to-maturity $ 12 $ — $ 1 $ — $ 18 $ 27 Available-for-sale 120 30 8,443 147,656 92,525 83,815 Other noninterest-bearing investments 21,176 14,008 25,045 12,693 23,706 8,544 21,308 14,038 33,489 160,349 116,249 92,386 Net gains (losses) $ 7,270 $ (126,860 ) $ 23,863 Statement of income information: Net impairment losses on investment securities $ — $ — $ (27 ) Equity securities gains, net 7,168 11,875 13,471 Fixed income securities gains (losses), net 102 (138,735 ) 10,419 Net gains (losses) $ 7,270 $ (126,860 ) $ 23,863 Interest income by security type is as follows: (In thousands) 2016 2015 2014 Taxable Nontaxable Total Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 10,306 $ 12,628 $ 22,934 $ 12,777 $ 10,892 $ 23,669 $ 14,770 $ 11,264 $ 26,034 Available-for-sale 166,281 11,582 177,863 94,877 3,326 98,203 71,365 2,558 73,923 Trading 3,123 — 3,123 2,214 — 2,214 1,979 — 1,979 $ 179,710 $ 24,210 $ 203,920 $ 109,868 $ 14,218 $ 124,086 $ 88,114 $ 13,822 $ 101,936 Investment securities with a carrying value of approximately $1.4 billion and $2.3 billion at December 31, 2016 and 2015 , 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 Volcker Rule, 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 Volcker Rule requiring divestiture by the Company were certain of its PEIs. Of the recorded PEIs of $139 million at December 31, 2016 , approximately $6 million remain prohibited by the Volcker Rule. As of December 31, 2016 , we have sold a total of $ 19 million of PEIs during 2016 and 2015 , including $10 million during 2016 and $9 million during 2015 . All of these sales were related to prohibited PEIs and resulted in insignificant amounts of realized gains or losses. We will dispose of the remaining $6 million of prohibited PEIs before the required deadline. The Federal Reserve Board (“FRB”) announced in December 2016 that it would allow banks to apply for an additional five-year extension to comply with the Dodd-Frank Act requirement for these investments. The Company applied for an extension for the vast majority of its remaining portfolio of PEIs. See other discussion in Notes 17 . As discussed in Note 17 , we have $ 26 million at December 31, 2016 of unfunded commitments for PEIs, of which approximately $4 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 Volcker Rule.

Loans And Allowance For Credit

Loans And Allowance For Credit Losses	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 Loans held for sale $ 171,934 $ 149,880 Commercial: Commercial and industrial $ 13,451,886 $ 13,211,481 Leasing 422,969 441,666 Owner-occupied 6,961,807 7,150,028 Municipal 778,335 675,839 Total commercial 21,614,997 21,479,014 Commercial real estate: Construction and land development 2,018,655 1,841,502 Term 9,322,138 8,514,401 Total commercial real estate 11,340,793 10,355,903 Consumer: Home equity credit line 2,645,192 2,416,357 1-4 family residential 5,890,714 5,382,099 Construction and other consumer real estate 486,712 385,240 Bankcard and other revolving plans 481,063 443,780 Other 189,794 187,149 Total consumer 9,693,475 8,814,625 Total loans $ 42,649,265 $ 40,649,542 Loan balances are presented net of unearned income and fees, which amounted to $77.0 million at December 31, 2016 and $81.0 million at December 31, 2015 . Owner-occupied and commercial real estate (“CRE”) loans include unamortized premiums of approximately $19.9 million at December 31, 2016 and $26.2 million at December 31, 2015 . 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 $289.8 million at December 31, 2016 , and $288.0 million at December 31, 2015 . Loans with a carrying value of approximately $24.0 billion at December 31, 2016 and $19.4 billion at December 31, 2015 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 2016 , $1.4 billion in 2015 , and $1.2 billion in 2014 , 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 loans are mainly sold to U.S. government agencies or participated to third parties. We generally have continuing involvement with the transferred loans, typically in the form of servicing rights or securities that are backed by the transferred loans in addition to a guarantee from the respective agency. The securities we receive in a loan transfer are not restricted from being pledged or exchanged. Amounts added to loans held for sale during these years were $1.4 billion , $1.4 billion , and $1.2 billion , respectively. The principal balance of sold loans for which we retain servicing was approximately $2.0 billion at both December 31, 2016 and December 31, 2015 . Income from loans sold, excluding servicing, was $18.1 million in 2016 , $17.8 million in 2015 , and $15.1 million in 2014 . Allowance for Credit Losses The ACL consists of the ALLL 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 and CRE loans are charged off or charged down when 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 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 consumer 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 loan portfolio. The methodology for impaired loans is discussed subsequently. For commercial and CRE loans with commitments equal to or greater than $750,000, we assign internal risk grades using a comprehensive loan grading system based on financial and statistical models, individual credit analysis, and loan officer experience and judgment. The credit quality indicators discussed subsequently are based on this grading system. Estimated losses for these commercial and CRE loans are derived from a statistical analysis of our historical default and loss given default (“LGD”) experience over the period of January 2008 through the most recent full quarter. For consumer and small commercial and CRE loans with commitments less than $750,000, we primarily use roll rate models to forecast probable inherent losses. Roll rate models measure the rate at which these loans migrate from one delinquency category to the next worse delinquency category, and eventually to loss. We estimate roll rates for these loans using recent delinquency and loss experience by segmenting our loan portfolios 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. 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: • Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices; • Changes in international, national, regional, and local economic and business conditions; • Changes in the nature and volume of the portfolio and in the terms of loans; • Changes in the experience, ability, and depth of lending management and other relevant staff; • Changes in the volume and severity of past due loans, the volume of nonaccrual loans, and the volume and severity of adversely classified or graded loans; • Changes in the quality of the loan review system; • Changes in the value of underlying collateral for collateral-dependent loans; • The existence and effect of any concentration of credit, and changes in the level of such concentrations; • The effect of other external factors such as competition and legal and regulatory requirements; The magnitude of the impact of these factors on our qualitative assessment of the ALLL changes from quarter to quarter according to changes made by management in its assessment of these factors, the extent these factors are already reflected in historic loss rates, and the extent changes in 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 Allowance for Credit Losses Assumptions During the first quarter of 2016, due to the consolidation of our separate banking charters, we enhanced our methodology to estimate the ACL on a company-wide basis. As described previously, for large commercial and CRE loans, we began estimating historic loss factors by separately calculating historic default and LGD rates, instead of directly calculating loss rates for groupings of probability of default and LGD grades using a loss migration approach. For small commercial and CRE loans, we began using roll rate models to estimate probable inherent losses. For consumer loans, we began pooling loans by current loan-to-value, where applicable. The impact of these changes was largely neutral to the total ACL at implementation. Changes in the allowance for credit losses are summarized as follows: December 31, 2016 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of year $ 454,277 $ 113,992 $ 37,779 $ 606,048 Additions: Provision for loan losses 92,796 217 (238 ) 92,775 Adjustment for FDIC-supported/PCI loans — — — — Deductions: Gross loan and lease charge-offs (169,260 ) (12,146 ) (15,959 ) (197,365 ) Recoveries 42,907 13,864 9,293 66,064 Net loan and lease (charge-offs) recoveries (126,353 ) 1,718 (6,666 ) (131,301 ) Balance at end of year $ 420,720 $ 115,927 $ 30,875 $ 567,522 Reserve for unfunded lending commitments Balance at beginning of year $ 57,696 $ 16,526 $ 616 $ 74,838 Provision credited to earnings (3,464 ) (5,847 ) (616 ) (9,927 ) Balance at end of year $ 54,232 $ 10,679 $ — $ 64,911 Total allowance for credit losses Allowance for loan losses $ 420,720 $ 115,927 $ 30,875 $ 567,522 Reserve for unfunded lending commitments 54,232 10,679 — 64,911 Total allowance for credit losses $ 474,952 $ 126,606 $ 30,875 $ 632,433 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 (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 The ALLL and outstanding loan balances according to the Company’s impairment method are summarized as follows: December 31, 2016 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Individually evaluated for impairment $ 55,951 $ 2,620 $ 5,995 $ 64,566 Collectively evaluated for impairment 364,703 113,202 24,483 502,388 Purchased loans with evidence of credit deterioration 66 105 397 568 Total $ 420,720 $ 115,927 $ 30,875 $ 567,522 Outstanding loan balances Individually evaluated for impairment $ 466,187 $ 78,190 $ 75,063 $ 619,440 Collectively evaluated for impairment 21,111,071 11,230,486 9,611,096 41,952,653 Purchased loans with evidence of credit deterioration 37,739 32,117 7,316 77,172 Total $ 21,614,997 $ 11,340,793 $ 9,693,475 $ 42,649,265 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 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) 2016 2015 Loans held for sale $ 40,330 $ — Commercial: Commercial and industrial $ 354,172 $ 163,906 Leasing 13,920 3,829 Owner-occupied 73,794 73,881 Municipal 852 951 Total commercial 442,738 242,567 Commercial real estate: Construction and land development 7,109 7,045 Term 29,012 40,253 Total commercial real estate 36,121 47,298 Consumer: Home equity credit line 10,842 8,270 1-4 family residential 35,577 50,254 Construction and other consumer real estate 1,677 748 Bankcard and other revolving plans 1,235 537 Other 139 186 Total consumer loans 49,470 59,995 Total $ 528,329 $ 349,860 Past due loans (accruing and nonaccruing) are summarized as follows: December 31, 2016 (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 Loans held for sale $ 171,934 $ — $ — $ — $ 171,934 $ — $ 40,330 Commercial: Commercial and industrial $ 13,306,132 $ 71,446 $ 74,308 $ 145,754 $ 13,451,886 $ 10,321 $ 286,883 Leasing 422,969 — — — 422,969 — 13,920 Owner-occupied 6,893,739 40,655 27,413 68,068 6,961,807 7,450 43,148 Municipal 778,334 — 1 1 778,335 1 852 Total commercial 21,401,174 112,101 101,722 213,823 21,614,997 17,772 344,803 Commercial real estate: Construction and land development 2,009,344 7,208 2,103 9,311 2,018,655 368 310 Term 9,290,756 8,806 22,576 31,382 9,322,138 12,349 18,469 Total commercial real estate 11,300,100 16,014 24,679 40,693 11,340,793 12,717 18,779 Consumer: Home equity credit line 2,635,321 3,868 6,003 9,871 2,645,192 1,500 4,474 1-4 family residential 5,857,429 11,982 21,303 33,285 5,890,714 121 11,342 Construction and other consumer real estate 479,383 3,258 4,071 7,329 486,712 2,557 162 Bankcard and other revolving plans 477,426 2,406 1,231 3,637 481,063 1,181 1,151 Other 189,044 711 39 750 189,794 — 70 Total consumer loans 9,638,603 22,225 32,647 54,872 9,693,475 5,359 17,199 Total $ 42,339,877 $ 150,340 $ 159,048 $ 309,388 $ 42,649,265 $ 35,848 $ 380,781 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 Loans held for sale $ 149,880 $ — $ — $ — $ 149,880 $ — $ — 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 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 low. 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 and improbable. 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 experience and 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 and certain small commercial and CRE loans with commitments 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, 2016 (In thousands) Pass Special mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 12,184,707 $ 266,027 $ 997,872 $ 3,280 $ 13,451,886 Leasing 387,275 4,689 30,017 988 422,969 Owner-occupied 6,560,030 96,464 305,313 — 6,961,807 Municipal 765,025 7,236 6,074 — 778,335 Total commercial 19,897,037 374,416 1,339,276 4,268 21,614,997 $ 420,720 Commercial real estate: Construction and land development 1,941,411 51,931 25,313 — 2,018,655 Term 9,096,745 81,698 143,695 — 9,322,138 Total commercial real estate 11,038,156 133,629 169,008 — 11,340,793 115,927 Consumer: Home equity credit line 2,629,285 — 15,907 — 2,645,192 1-4 family residential 5,850,771 — 39,943 — 5,890,714 Construction and other consumer real estate 482,167 — 4,545 — 486,712 Bankcard and other revolving plans 477,756 — 3,307 — 481,063 Other 189,360 — 434 — 189,794 Total consumer loans 9,629,339 — 64,136 — 9,693,475 30,875 Total $ 40,564,532 $ 508,045 $ 1,572,420 $ 4,268 $ 42,649,265 $ 567,522 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 Impaired Loans Loans are considered impaired when, based on currprobent 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. Purchased credit-impaired (“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, 2016 and 2015 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, 2016 and 2015 : December 31, 2016 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 $ 469,880 $ 82,197 $ 310,740 $ 392,937 $ 52,164 $ 332,775 $ 4,783 Owner-occupied 110,779 70,983 29,713 100,696 3,138 98,903 9,082 Municipal 1,331 852 — 852 — 892 — Total commercial 581,990 154,032 340,453 494,485 55,302 432,570 13,865 Commercial real estate: Construction and land development 21,891 7,093 6,614 13,707 224 10,906 2,325 Term 78,991 52,987 16,725 69,712 1,305 76,421 12,810 Total commercial real estate 100,882 60,080 23,339 83,419 1,529 87,327 15,135 Consumer: Home equity credit line 24,531 15,466 6,831 22,297 477 21,680 1,324 1-4 family residential 59,271 27,366 28,430 55,796 5,549 56,573 1,683 Construction and other consumer real estate 3,128 859 1,763 2,622 364 2,487 132 Bankcard and other revolving plans — — — — — — 18 Other 1,592 1,110 30 1,140 2 2,019 353 Total consumer loans 88,522 44,801 37,054 81,855 6,392 82,759 3,510 Total $ 771,394 $ 258,913 $ 400,846 $ 659,759 $ 63,223 $ 602,656 $ 32,510 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 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. Trouble debt restructurings (“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, 2016 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 $ 241 $ 18,674 $ — $ 67 $ 43 $ 27,679 $ 46,704 Owner-occupied 2,543 191 887 — 7,832 10,616 22,069 Total commercial 2,784 18,865 887 67 7,875 38,295 68,773 Commercial real estate: Construction and land development 40 3,425 — — — 3,414 6,879 Term 4,491 224 162 979 1,776 10,403 18,035 Total commercial real estate 4,531 3,649 162 979 1,776 13,817 24,914 Consumer: Home equity credit line 195 1,451 9,903 4 161 2,554 14,268 1-4 family residential 2,301 419 6,476 252 2,608 29,487 41,543 Construction and other consumer real estate 160 226 13 — — 897 1,296 Other — — 122 — — — 122 Total consumer loans 2,656 2,096 16,514 256 2,769 32,938 57,229 Total accruing 9,971 24,610 17,563 1,302 12,420 85,050 150,916 Nonaccruing Commercial: Commercial and industrial 775 185 — 1,085 33,037 24,716 59,798 Owner-occupied 601 837 — 2,821 1,045 12,482 17,786 Municipal — 852 — — — — 852 Total commercial 1,376 1,874 — 3,906 34,082 37,198 78,436 Commercial real estate: Construction and land development — 39 — — 1,725 — 1,764 Term 1,659 1,058 — — 2,474 2,939 8,130 Total commercial real estate 1,659 1,097 — — 4,199 2,939 9,894 Consumer: Home equity credit line — 431 1,036 35 — 670 2,172 1-4 family residential — 158 1,643 292 1,253 4,830 8,176 Construction and other consumer real estate — 88 92 1,145 1 — 1,326 Total consumer loans — 677 2,771 1,472 1,254 5,500 11,674 Total nonaccruing 3,035 3,648 2,771 5,378 39,535 45,637 100,004 Total $ 13,006 $ 28,258 $ 20,334 $ 6,680 $ 51,955 $ 130,687 $ 250,920 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 Other — — — — — — — 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 5

Derivative Instruments And Hedg

Derivative Instruments And Hedging Activities	12 Months Ended
	Dec. 31, 2016
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 accounting 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. During 2016 we closed our branch in Grand Cayman, Grand Cayman Islands B.W.I. and no longer have foreign operations. No derivatives were designated as hedges of investments in foreign operations during 2016. 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 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 related variable-rate loans and as amounts for terminated hedges are accreted or amortized to earnings. For the 12 months following December 31, 2016 , we estimate that an additional $2.0 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 master agreements. Eligible collateral types are documented by the CSA and controlled under the Company’s general credit policies. Collateral balances 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, 2016 , the fair value of our derivative liabilities was $59.2 million , for which we were required to pledge cash collateral of approximately $43.8 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, 2016 , the additional amount of collateral we could be required to pledge is approximately $1.1 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, 2016 and 2015 , and the related gain (loss) of derivative instruments for the years then ended is summarized as follows: December 31, 2016 December 31, 2015 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 $ 2,289 $ 1,148 $ 1,387,500 $ 5,461 $ 956 Total derivatives designated as hedging instruments 1,387,500 2,289 1,148 1,387,500 5,461 956 Derivatives not designated as hedging instruments Interest rate swaps 235,167 1,876 351 40,314 — 8 Interest rate swaps for customers 2 4,162,264 48,754 49,050 3,256,190 51,353 53,843 Foreign exchange 424,215 11,276 8,672 463,064 20,824 17,761 Total derivatives not designated as hedging instruments 4,821,646 61,906 58,073 3,759,568 72,177 71,612 Total derivatives $ 6,209,146 $ 64,195 $ 59,221 $ 5,147,068 $ 77,638 $ 72,568 Year Ended December 31, 2016 Year Ended December 31, 2015 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 $ 7,912 $ 11,290 $ 12,124 $ 9,004 7,912 11,290 3 12,124 9,004 3 Fair value hedges: Terminated swaps on long-term debt $ — $ 1,504 Total derivatives designated as hedging instruments 7,912 11,290 — 12,124 9,004 1,504 Derivatives not designated as hedging instruments Interest rate swaps $ 1,096 $ — Interest rate swaps for customers 2 13,952 7,438 Futures contracts — 2 Foreign exchange 10,696 9,519 Total derivatives not designated as hedging instruments 25,744 16,959 Total derivatives $ 7,912 $ 11,290 $ 25,744 $ — $ 12,124 $ 9,004 $ 16,959 $ 1,504 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 $11.3 million for 2016 and $9.0 million for 2015 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 $1.7 million and $2.4 million at December 31, 2016 and 2015 , respectively. The fair value of derivative liabilities was reduced by a net debit valuation adjustment of $1.4 million at December 31, 2016 . This amount was not significant at December 31, 2015 . 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, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Disclosure [Text Block]	. PREMISES, EQUIPMENT AND SOFTWARE, NET Premises, equipment and software, net are summarized as follows: (In thousands) December 31, 2016 2015 Land $ 229,398 $ 229,693 Buildings 683,450 598,643 Furniture and equipment 457,745 459,975 Leasehold improvements 139,568 138,765 Software 354,763 295,428 Total 1,864,924 1,722,504 Less accumulated depreciation and amortization 845,416 817,042 Net book value $ 1,019,508 $ 905,462

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 2016 2015 2016 2015 Core deposit intangibles $ 166,518 $ 166,518 $ (158,444 ) $ (151,157 ) $ 8,074 $ 15,361 Customer relationships and other intangibles 28,014 28,014 (27,668 ) (27,103 ) 346 911 Total $ 194,532 $ 194,532 $ (186,112 ) $ (178,260 ) $ 8,420 $ 16,272 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, 2016 : (In thousands) 2017 $ 6,404 2018 1,557 2019 459 2020 — 2021 — 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, 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 Impairment losses — — — — Balance at December 31, 2016 $ 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 2016 and 2015 concluded that no impairment was present in any of the operating segments.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Deposit Liabilities Disclosures [Text Block]	DEPOSITS At December 31, 2016 , the scheduled maturities of all time deposits were as follows: (In thousands) 2017 $ 2,139,822 2018 291,826 2019 110,993 2020 109,927 2021 103,738 Thereafter 504 Total $ 2,756,810 At December 31, 2016 , the contractual maturities of domestic time deposits with a denomination of $100,000 and over were as follows: $417 million in 3 months or less, $401 million over 3 months through 6 months, $679 million over 6 months through 12 months, and $364 million over 12 months. Domestic time deposits in denominations that meet or exceed the current FDIC insurance limit of $250,000 were $1.4 billion and $584 million at December 31, 2016 and 2015 , respectively. Domestic time deposits under $250,000 were $1.4 billion and $1.5 billion at December 31, 2016 and 2015 , respectively. As of December 31, 2016 there were no Foreign time deposits $250,000 and over, and $112 million at December 31, 2015 . Deposit overdrafts reclassified as loan balances were $11 million and $14 million at December 31, 2016 and 2015 , respectively.

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2016
Short-term Debt [Abstract]
Short-Term Borrowings	SHORT-TERM BORROWINGS Selected information for federal funds and other short-term borrowings is as follows: (In thousands) 2016 2015 2014 Federal funds purchased Average amount outstanding $ 104,866 $ 105,910 $ 104,358 Average rate 0.29 % 0.18 % 0.17 % Highest month-end balance 147,900 122,461 124,093 Year-end balance 105,563 111,263 100,193 Average rate on outstandings at year-end 0.51 % 0.25 % 0.15 % Security repurchase agreements Average amount outstanding 311,045 127,358 116,190 Average rate 0.23 % 0.11 % 0.06 % Highest month-end balance 823,744 205,566 156,710 Year-end balance 196,385 205,566 118,600 Average rate on outstandings at year-end 0.26 % 0.15 % 0.13 % Other short-term borrowings , year-end balances Securities sold, not yet purchased 25,321 30,158 24,230 Other 500,000 — 1,200 Total federal funds and other short-term borrowings $ 827,269 $ 346,987 $ 244,223 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). ZB, N.A. executes overnight repurchase agreements with sweep accounts in conjunction with a master repurchase agreement. When this occurs, securities under the Bank’s control are pledged and interest is paid on the collected balance of the customers’ accounts. For the non-sweep overnight and 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, 2016 , $58 million were overnight and $139 million were term. ZB, N.A. may borrow from the FHLB under their lines of credit that are secured under blanket pledge arrangements. ZB, N.A. 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, 2016 , the amount available for FHLB advances was approximately $13 billion and $500 million short-term FHLB advances were outstanding. ZB, N.A. may also borrow from the Federal Reserve based on the amount of collateral pledged to a Federal Reserve Bank. At December 31, 2016 , the amount available for additional Federal Reserve borrowings was approximately $4 billion .

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2016
Long-term Debt, Unclassified [Abstract]
Debt Disclosure [Text Block]	LONG-TERM DEBT Long-term debt is summarized as follows: December 31, (In thousands) 2016 2015 Junior subordinated debentures related to trust preferred securities $ — $ 164,950 Subordinated notes 246,550 246,170 Senior notes 287,560 400,334 Capital lease obligations 740 912 Total $ 534,850 $ 812,366 The preceding amounts represent the par value of the debt adjusted for any unamortized premium or discount or unamortized debt issuance costs. The amount of long-term debt as of December 31, 2015 presented in the schedule differs from the amount presented in our 2015 Form 10-K as a result of the reclassification of $5 million of unamortized debt issuance costs to long-term debt in compliance with ASU 2015-03. Trust Preferred Securities We elected to exercise our right to redeem the junior subordinated debentures related to trust preferred securities issued to the following trusts. Redemptions included a total of $129 million in the third quarter of 2016 , and $36 million in the fourth quarter of 2016 . The following schedule presents the outstanding trust preferred securities balances as of December 31, 2016 and 2015 . (In thousands) December 31, 2016 December 31, 2015 Coupon rate 1 Redemption Date Amegy Statutory Trust I $ — $ 51,547 3mL+2.85% (3.38%) September 17, 2016 Amegy Statutory Trust II — 36,083 3mL+1.90% (2.22%) October 7, 2016 Amegy Statutory Trust III — 61,856 3mL+1.78% (2.29%) September 15, 2016 Stockmen’s Statutory Trust II — 7,732 3mL+3.15% (3.75%) September 26, 2016 Stockmen’s Statutory Trust III — 7,732 3mL+2.89% (3.42%) September 17, 2016 Total $ — $ 164,950 1 Designation of “3mL” is three-month LIBOR. The junior subordinated debentures for the Amegy and Stockmen’s Trusts were assumed by the Parent through previous acquisitions and mergers, and were previously direct and unsecured obligations of the Parent. They were subordinate to other indebtedness and general creditors. Subordinated Notes Subordinated notes were issued by the Parent and consist of the following at December 31, 2016 : (In thousands) Subordinated notes Coupon rate Balance Par amount Maturity 5.65% $ 160,195 $ 162,000 Nov 2023 6.95% 86,355 87,891 Sep 2028 Total $ 246,550 $ 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 were issued by the Parent and consist of the following at December 31, 2016 : (In thousands) Senior notes Coupon rate Balance Par amount Maturity 4.50% 152,411 163,857 March 2017 4.50% 135,149 145,231 June 2023 Total $ 287,560 $ 309,088 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. Debt Redemptions and Repurchases We redeemed or repurchased the following amounts of long-term debt during 2016 and 2015 : (In thousands) 2016 2015 Note type Par amount Par amount Trust preferred: 3mL+2.85% $ 3,093 3mL+2.85% (3.38%) $ 51,547 3mL+1.90% (2.22%) 36,083 3mL+1.78% (2.29%) 61,856 3mL+3.15% (3.75%) 7,732 3mL+2.89% (3.42%) 7,732 164,950 3,093 Convertible subordinated notes: 6.00% 79,276 5.50% 71,592 — 150,868 Subordinated notes: 6.00% 32,366 5.50% 52,078 — 84,444 Senior notes: 3.30% - 3.70% 27,281 3.60% 11,108 4.00% 89,360 100,468 27,281 Federal Home Loan Bank Advances 22,009 Total $ 265,418 $ 287,695 Debt Extinguishment Costs Debt extinguishment costs are as follows for the years 2016 , 2015 and 2014 : (In thousands) 2016 2015 2014 Early tender premiums $ — $ 2,395 $ 33,971 Write-offs of unamortized debt discount and issuance costs and fees 353 135 10,451 Total $ 353 $ 2,530 $ 44,422 Maturities of Long-term Debt Maturities of long-term debt are as follows for the years succeeding December 31, 2016 : (In thousands) Consolidated Parent only 2017 $ 152,608 $ 152,411 2018 225 — 2019 259 — 2020 59 — 2021 — — Thereafter 381,699 381,699 Total $ 534,850 $ 534,110 The $381.7 million of Parent only maturities payable after 2021 consists of senior notes and subordinated notes.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2016
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 applicable 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 2016 2015 Authorized Outstanding Rate (when applicable) Series A $ 66,316 $ 66,316 140,000 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 138,391 171,827 200,000 138,391 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 98,555 125,224 300,893 98,555 5.8% Semi-annually Jun,Dec Jun 15, 2023 annual float-ing rate = 3mL+3.8% Qtrly Mar,Jun,Sep,Dec Series J 136,368 195,152 195,152 136,368 7.2% Semi-annually Mar,Sep Sep 15, 2023 annual float-ing rate = 3mL+4.44% Qtrly Mar,Jun,Sep,Dec Total $ 709,601 $ 828,490 Preferred Stock Redemptions During 2016 , we launched a cash tender offer to purchase up to $120 million par amount of certain outstanding preferred stock. Our preferred stock decreased by $119 million as a result of the tender offer, including the purchase of $27 million of our Series I preferred stock, $59 million of our Series J preferred stock, and $33 million of our Series G preferred stock for an aggregate cash payment of $126 million . The total one-time reduction to net earnings applicable to common shareholders associated with the preferred stock redemption was $9.8 million . We also launched a $180 million cash tender offer during 2015 , which resulted in a Series I preferred stock redemption of approximately $176 million . The size and terms of the offers in 2016 and 2015 were determined in accordance with the Company’s 2015 capital plan. Our 2016 capital plan (which spans the timeframe of July 2016 to June 2017) allows for the redemption of up to $144 million of preferred equity. Common Stock The Company commenced its common stock buyback program during 2016 and repurchased 2.89 million shares of common shares outstanding with a fair value of $90 million at an average price of $31.15 per share. During the first quarter of 2017, the Company repurchased an additional $45 million of common stock at an average price of $42.43 per share, leaving $45 million of buyback capacity remaining in the 2016 capital plan. Common Stock Warrants As of December 31, 2016, we have 5.8 million common stock warrants at an exercise price of $36.27 per share which expire on November 14, 2018 . These warrants were associated with the preferred stock issued under the Troubled Asset Relief Program which was redeemed in 2012. In addition, we have 29.3 million common stock warrants at an exercise price of $35.82 , as of December 31, 2016, which expire on 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 2016 Balance at December 31, 2015 $ (18,369 ) $ 1,546 $ (37,789 ) $ (54,612 ) Other comprehensive income (loss) before reclassifications, net of tax (73,985 ) 7,093 1,756 (65,136 ) Amounts reclassified from AOCI, net of tax (63 ) (7,000 ) 5,230 (1,833 ) Other comprehensive income (loss) (74,048 ) 93 6,986 (66,969 ) Balance at December 31, 2016 $ (92,417 ) $ 1,639 $ (30,803 ) $ (121,581 ) Income tax expense (benefit) included in other comprehensive income (loss) $ (44,898 ) $ (76 ) $ 5,356 $ (39,618 ) 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 Statement of Income (SI) Balance Sheet (BS) (In thousands) Amounts reclassified from AOCI 1 Details about AOCI components 2016 2015 2014 Affected line item Net realized gains (losses) on investment securities $ 102 $ (138,735 ) $ 10,419 SI Fixed income securities gains (losses), net Income tax expense (benefit) 39 (52,712 ) 3,971 63 (86,023 ) 6,448 Net unrealized losses on investment securities — — (27 ) SI Net impairment losses on investment securities Income tax benefit — — (10 ) — — (17 ) Accretion of securities with noncredit-related impairment losses not expected to be sold — — (1,878 ) BS Investment securities, held-to-maturity Deferred income taxes — — 767 BS Other assets $ 63 $ (86,023 ) $ 5,320 Net unrealized gains on derivative instruments $ 11,290 $ 9,004 $ 2,594 SI Interest and fees on loans Income tax expense 4,290 3,421 989 $ 7,000 $ 5,583 $ 1,605 Amortization of net actuarial loss $ (8,436 ) $ (5,996 ) $ (2,843 ) SI Salaries and employee benefits Amortization of prior service cost — — (50 ) SI Salaries and employee benefits Income tax benefit (3,206 ) (2,278 ) (1,103 ) $ (5,230 ) $ (3,718 ) $ (1,790 ) 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, 2016 and 2015 , the cost of the common stock included in retained earnings was approximately $14.1 million and $15.2 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, 2016 and 2015 , total invested assets were approximately $91.0 million and $81.8 million and total obligations were approximately $105.2 million and $96.9 million , respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Taxes [Abstract]
Income Taxes	INCOME TAXES Income tax expense is summarized as follows: (In thousands) 2016 2015 2014 Federal: Current $ 217,400 $ 158,164 $ 178,450 Deferred (4,108 ) (31,843 ) 14,277 213,292 126,321 192,727 State: Current 26,900 14,027 18,573 Deferred (4,334 ) 2,040 11,661 22,566 16,067 30,234 $ 235,858 $ 142,388 $ 222,961 Income tax expense computed at the statutory federal income tax rate of 35% reconciles to actual income tax expense as follows: (In thousands) 2016 2015 2014 Income tax expense at statutory federal rate $ 246,718 $ 158,151 $ 217,498 State income taxes including credits, net 14,668 10,443 19,652 Other nondeductible expenses 3,149 3,205 2,949 Nontaxable income (24,688 ) (20,397 ) (17,869 ) Tax credits and other taxes (1,704 ) (2,926 ) (1,717 ) Other (2,285 ) (6,088 ) 2,448 $ 235,858 $ 142,388 $ 222,961 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, 2016 2015 Gross deferred tax assets: Book loan loss deduction in excess of tax $ 240,881 $ 254,223 Pension and postretirement 19,332 24,749 Deferred compensation 87,420 91,665 Security investments and derivative fair value adjustments 56,628 11,254 Net operating losses, capital losses and tax credits 4,664 4,659 FDIC-supported transactions 5,086 9,157 Other 46,052 46,016 460,063 441,723 Valuation allowance (4,127 ) (4,261 ) Total deferred tax assets 455,936 437,462 Gross deferred tax liabilities: Core deposits and purchase accounting (1,140 ) (3,392 ) Premises and equipment, due to differences in depreciation (7,548 ) (10,588 ) Federal Home Loan Bank stock dividends (3,800 ) (10,042 ) Leasing operations (75,109 ) (85,255 ) Prepaid expenses (6,534 ) (9,001 ) Prepaid pension reserves (17,659 ) (18,087 ) Mortgage servicing (9,844 ) (6,845 ) Subordinated debt modification (30,762 ) (46,451 ) Deferred loan fees (25,425 ) (23,723 ) Equity investments (27,651 ) (21,037 ) Total deferred tax liabilities (205,472 ) (234,421 ) Net deferred tax assets $ 250,464 $ 203,041 The amount of net DTAs is included with other assets in the balance sheet. The $4.1 million and $4.3 million valuation allowances at December 31, 2016 and 2015 , respectively, were for certain acquired net operating loss carryforwards included in our acquisition of the remaining interests in a less significant subsidiary. At December 31, 2016 , excluding the $4.1 million , the tax effect of remaining net operating loss and tax credit carryforwards was approximately $0.5 million expiring through 2030 . We evaluate the 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, 2016 . We have a liability for unrecognized tax benefits relating to uncertain tax positions for tax credits on technology initiatives. A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows: (In thousands) 2016 2015 2014 Balance at beginning of year $ 5,448 $ 3,255 $ 2,385 Tax positions related to current year: Additions 1,554 786 — Reductions — — — Tax positions related to prior years: Additions 542 1,407 870 Reductions — — — Settlements with taxing authorities — — — Lapses in statutes of limitations (3,255 ) — — Balance at end of year $ 4,289 $ 5,448 $ 3,255 At December 31, 2016 and 2015 , the liability for unrecognized tax benefits included approximately $3.4 million and $3.9 million , respectively (net of the federal tax benefit on state issues) that, if recognized, would affect the effective tax rate. We do not have any unrecognized tax benefits that may decrease during the 12 months subsequent to December 31, 2016 . Interest and penalties related to unrecognized tax benefits are included in income tax expense in the statement of income. At December 31, 2016 and 2015 , accrued interest and penalties recognized in the balance sheet, net of any federal and/or state tax benefits, were approximately $0.1 million and $0.7 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 2011 for certain state returns.

Net Earnings Per Common Share

Net Earnings Per Common Share	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
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 are summarized as follows: (In thousands, except per share amounts) 2016 2015 2014 Basic: Net income $ 469,050 $ 309,471 $ 398,462 Less common and preferred dividends 115,418 107,990 103,111 Undistributed earnings 353,632 201,481 295,351 Less undistributed earnings applicable to nonvested shares 3,802 1,836 2,933 Undistributed earnings applicable to common shares 349,830 199,645 292,418 Distributed earnings applicable to common shares 57,180 44,816 30,983 Total earnings applicable to common shares $ 407,010 $ 244,461 $ 323,401 Weighted average common shares outstanding 203,855 203,265 192,207 Net earnings per common share $ 2.00 $ 1.20 $ 1.68 Diluted: Total earnings applicable to common shares $ 407,010 $ 244,461 $ 323,401 Weighted average common shares outstanding 203,855 203,265 192,207 Additional weighted average dilutive shares 414 433 582 Weighted average diluted common shares outstanding 204,269 203,698 192,789 Net earnings per common share $ 1.99 $ 1.20 $ 1.68 For 2016, preferred dividends were increased by a preferred stock redemption of $10 million that resulted from the partial redemption of the Company’s Series I, J, and G preferred stock. See further discussion in Note 13 .

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2016
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, RSUs, and other awards to employees and nonemployee directors. Total shares authorized under the plan were 9,000,000 at December 31, 2016 , of which 5,685,169 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) 2016 2015 2014 Compensation expense $ 26,144 $ 24,974 $ 23,632 Reduction of income tax expense 8,762 8,284 7,767 As of December 31, 2016 , compensation expense not yet recognized for nonvested share-based awards was approximately $25.7 million , which is expected to be recognized over a weighted average period of 2.3 years. The tax effects recognized from the exercise of stock options and the vesting of restricted stock and RSUs increased common stock by approximately $1.5 million in 2016 , decreased common stock by approximately $0.8 million in 2015 , and increased common stock by approximately $0.4 million in 2014. 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 2016 , 2015 , and 2014 , 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: 2016 2015 2014 Weighted average of fair value for options granted $ 5.24 $ 6.17 $ 6.10 Weighted average assumptions used: Expected dividend yield 1.3 % 1.3 % 1.3 % Expected volatility 30.0 % 25.0 % 25.1 % Risk-free interest rate 1.21 % 1.57 % 1.55 % Expected life (in years) 5.0 5.0 5.0 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, 2016 : Number of shares Weighted average exercise price 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 Granted 789,651 21.25 Exercised (1,055,532 ) 23.75 Expired (56,297 ) 61.60 Forfeited (44,007 ) 27.66 Balance at December 31, 2016 3,437,910 26.44 Outstanding stock options exercisable as of: December 31, 2016 1,892,136 $ 27.60 December 31, 2015 2,187,259 26.35 December 31, 2014 3,804,873 33.86 We issue new authorized common shares for the exercise of stock options. The total intrinsic value of stock options exercised was approximately $10.0 million in 2016 , $6.7 million in 2015 , and $3.9 million in 2014 . Cash received from the exercise of stock options was $23.8 million in 2016 , $22.7 million in 2015 , and $10.6 million in 2014 . Additional selected information on stock options at December 31, 2016 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 $19.99 277,859 $ 17.81 2.4 1 277,859 $ 17.81 $20.00 to $24.99 1,121,039 21.97 4.4 382,396 23.84 $25.00 to $29.99 1,877,880 28.35 4.4 1,088,210 28.14 $30.00 to $44.99 52,379 30.10 3.3 34,918 30.10 $45.00 to $59.99 70,200 47.10 1.2 70,200 47.10 $60.00 to $79.99 2,553 72.08 0.1 2,553 72.08 $80.00 to $83.38 36,000 83.38 0.4 36,000 83.38 3,437,910 26.44 4.1 1 1,892,136 27.60 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, 2016 and 2015 was $58.9 million and $8.0 million , respectively, while the aggregate intrinsic value of exercisable options was $31.0 million and $8.0 million at the same respective dates. For exercisable options, the weighted average remaining contractual life was 3.0 years and 3.1 years at December 31, 2016 and 2015 , respectively, excluding the stock options previously noted without a fixed expiration date. At December 31, 2016 , 1,491,656 stock options with a weighted average exercise price of $25.03 , a weighted average remaining life of 5.5 years, and an aggregate intrinsic value of $26.9 million , 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 32,310 RSUs in 2016 ; 31,080 RSUs in 2015 ; and 16,670 shares of restricted stock and 6,656 RSUs in 2014 . The 2016 and 2015 RSUs vested immediately upon grant, and the 2014 awards vested over six months. The following summarizes our restricted stock activity for the three years ended December 31, 2016 : Number of shares Weighted average issue price 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 Issued 36,594 24.43 Vested (32,709 ) 20.80 Nonvested restricted shares at December 31, 2016 63,255 25.43 The following summarizes our RSU activity for the three years ended December 31, 2016 : Number of restricted stock units Weighted average grant price 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 Granted 1,033,167 21.69 Vested (724,713 ) 25.88 Forfeited (59,839 ) 26.28 Restricted stock units at December 31, 2016 2,047,158 25.08 The total fair value at grant date of restricted stock and RSUs vested during the year was $19.4 million in both 2016 and 2015 , and $15.2 million in 2014 . At December 31, 2016 , 63,255 shares of restricted stock and 1,370,435 RSUs were expected to vest with an aggregate intrinsic value of $2.7 million and $59.0 million , respectively.

Commitments, Guarantees, Contin

Commitments, Guarantees, Contingent Liabilities, and Related Parties	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 Net unfunded commitments to extend credit 1 $ 18,273,714 $ 17,169,785 Standby letters of credit: Financial 771,269 661,554 Performance 195,451 216,843 Commercial letters of credit 60,320 18,447 Total unfunded lending commitments $ 19,300,754 $ 18,066,629 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, 2016 , $5.9 billion of commitments expire in 2017 . 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 $568 million expiring in 2017 and $398 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, 2016 , the Company recorded $4.7 million as a liability for these guarantees, which consisted of $1.6 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, 2016 , we had unfunded commitments for PEIs of $26 million . These obligations have no stated maturity. PEIs related to these commitments prohibited by the Volcker Rule were $4 million . See the related discussion about these investments in Note 5 . 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, 2016 and 2015 , the regulatory risk-weighted values assigned to all off-balance sheet financial instruments and derivative instruments described herein were $6.5 billion and $6.3 billion , respectively. At December 31, 2016 , we were required to maintain cash balances of $353.6 million with the Federal Reserve Banks to meet minimum balance requirements in accordance with FRB regulations. Leases We have commitments for leasing premises and equipment under the terms of noncancelable capital and operating leases expiring from 2017 and 2052 . Premises leased under capital leases at December 31, 2016 , were $1.2 million and accumulated amortization was $1.0 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, 2016 , are as follows: (in thousands) 2017 $ 44,797 2018 42,963 2019 36,074 2020 31,043 2021 25,670 Thereafter 94,049 $ 274,596 Future aggregate minimum rental payments have been reduced by noncancelable subleases as follows: $1.1 million in 2017 , $1.1 million in 2018 , $0.9 million in 2019 , and $0.1 million in 2020 . Aggregate rental expense on operating leases amounted to $64.8 million in 2016 , $62.5 million in 2015 , and $59.2 million in 2014 . 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, 2016 , we were subject to the following material litigation and governmental inquiries: • a governmental inquiry conducted by the Department of Justice into our payment processing practices relating to certain telemarketing customers alleged to have engaged in fraudulent marketing practices. The factual issues related to this case are the same as those involved in the Reyes case, discussed subsequently. We commenced substantive settlement discussion with the U.S. Attorney’s Office for the Eastern District of Pennsylvania in the third quarter of 2016. There can be no assurance, however, that the parties will be able to settle this matter. • a civil suit, Shou-En Wang v. CB&T , brought against us in the Superior Court for Los Angeles County, Central District in April 2016. The case relates to our depositor relationships with customers who were promoters of an investment program that allegedly misappropriated investors’ funds. This case is in an early phase, with initial motion practice having been completed. • a civil suit, McFarland as Trustee for International Manufacturing Group v. CB&T, et. al ., brought against us in the United States Bankruptcy Court for the Eastern District of California in May 2016. The Trustee seeks to recover loan payments previously repaid by borrower International Manufacturing Group, alleging that International Manufacturing Group, along with its principal, obtained loans and made loan repayments in furtherance of an alleged Ponzi scheme. This case is in an early phase with motion practice having commenced. As of December 31, 2016 , we considered the following previously reported matters to be closed: • Reyes v. Zions First National Bank, et. al., a class action brought against us in 2010 and conditionally settled in the second quarter of 2016. The settlement was finally approved by the court and the settlement payment was released from escrow in December 2016. We had fully reserved for our obligations with respect to the settlement. A portion of the settlement was covered by our insurance policies and was funded by our insurers. • a governmental inquiry conducted by the Department of Justice into possible money laundering activities of one of our bank customers and our anti-money laundering practices relating to that customer. Our first contact with the United States Attorney’s Office for the Southern District of New York relating to this matter occurred in early 2012. We have not received communication from the United States Attorney’s Office for a substantial period of time. 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, 2016 , we estimated that the aggregate range of reasonably possible losses for those matters to be from $0 million to roughly $20 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, 2016
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 Office of the Comptroller of the Currency (“OCC”) published final rules (the “Basel III Capital Rules”) establishing a new comprehensive capital framework for U.S. banking organizations. The rules implemented 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, 2016 , 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” 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 OCC, known as the Dodd-Frank Act Stress Test (“DFAST”). The actual capital amounts and ratios at December 31, 2016 and 2015 for the Company and its subsidiary bank under Basel III are as follows: December 31, 2016 To be well-capitalized (In thousands) Amount Ratio Amount Ratio Transitional Basis Basel III Regulatory Capital Rules Total capital (to risk-weighted assets) The Company $ 7,608,502 15.24 % $ 4,993,671 10.00 % ZB, National Association 7,277,987 14.61 4,983,000 10.00 Tier 1 capital (to risk-weighted assets) The Company 6,737,638 13.49 3,994,937 8.00 ZB, National Association 6,654,990 13.36 3,986,400 8.00 Common equity tier 1 capital (Basel III) The Company 6,028,037 12.07 3,245,886 6.50 ZB, National Association 5,824,090 11.69 3,238,950 6.50 Tier 1 capital (to average assets) The Company 6,737,638 11.09 na na 1 ZB, National Association 6,654,990 10.99 3,027,427 5.00 December 31, 2015 To be well-capitalized (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 . 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 Common Equity Tier 1 (“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, 2016
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 is frozen to new participation. No service-related benefits have been since July 1, 2013. 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. Although there was no minimum regulatory contribution required in 2016 , we elected to contribute $4 million to the pension plan. Currently, it is expected that no minimum regulatory contributions will be required in 2017 . 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 2016 2015 2016 2015 2016 2015 Change in benefit obligation: Benefit obligation at beginning of year $ 173,208 $ 185,944 $ 9,994 $ 10,595 $ 954 $ 1,067 Service cost — — — — 21 33 Interest cost 6,995 7,094 402 403 38 40 Actuarial (gain) loss (2,097 ) (8,085 ) 110 (226 ) 7 (121 ) Benefits paid (12,977 ) (11,745 ) (786 ) (778 ) (81 ) (65 ) Benefit obligation at end of year 165,129 173,208 9,720 9,994 939 954 Change in fair value of plan assets: Fair value of plan assets at beginning of year 157,318 170,199 — — — — Actual return on plan assets 13,326 (1,136 ) — — — — Employer contributions 4,000 — 786 778 81 65 Benefits paid (12,977 ) (11,745 ) (786 ) (778 ) (81 ) (65 ) Fair value of plan assets at end of year 161,667 157,318 — — — — Funded status $ (3,462 ) $ (15,890 ) $ (9,720 ) $ (9,994 ) $ (939 ) $ (954 ) Amounts recognized in balance sheet: Liability for pension/postretirement benefits $ (3,462 ) $ (15,890 ) $ (9,720 ) $ (9,994 ) $ (939 ) $ (954 ) Accumulated other comprehensive income (loss) (47,658 ) (60,067 ) (2,281 ) (2,288 ) 258 332 Accumulated other comprehensive income (loss) consists of: Net gain (loss) $ (47,658 ) $ (60,067 ) $ (2,281 ) $ (2,288 ) $ 258 $ 332 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, 2016 expected to be recognized as an expense component of net periodic benefit cost in 2017 for the plans are estimated as follows: (In thousands) Pension Supplemental Retirement Postretirement Net gain (loss) $ (4,866 ) $ (123 ) $ 52 The following presents the components of net periodic benefit cost (credit) for the plans: Pension Supplemental Retirement Postretirement (In thousands) 2016 2015 2014 2016 2015 2014 2016 2015 2014 Service cost $ — $ — $ — $ — $ — $ — $ 21 $ 33 $ 31 Interest cost 6,995 7,094 7,468 402 403 454 38 40 47 Expected return on plan assets (11,397 ) (12,360 ) (13,305 ) Amortization of net actuarial (gain) loss 6,149 5,926 2,895 117 123 19 (67 ) (53 ) (71 ) Amortization of prior service cost — — 50 — — — Settlement loss 2,235 — — — — — Net periodic benefit cost (credit) $ 3,982 $ 660 $ (2,942 ) $ 519 $ 526 $ 523 $ (8 ) $ 20 $ 7 Weighted average assumptions based on the pension plan are the same where applicable for each of the plans and are as follows: 2016 2015 2014 Used to determine benefit obligation at year-end: Discount rate 4.10 % 4.20 % 3.95 % Used to determine net periodic benefit cost for the years ended December 31: Discount rate 4.20 3.95 4.60 Expected long-term return on plan assets 7.50 7.50 8.00 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, 2016 : (In thousands) Pension Supplemental Retirement Postretirement 2017 $ 9,988 $ 1,911 $ 94 2018 10,051 855 99 2019 9,821 882 100 2020 10,181 834 103 2021 10,268 766 98 Years 2022 - 2026 50,166 3,309 419 We are also obligated under other supplemental retirement plans for certain current and former employees. Our liability for these plans was $6.4 million and $6.9 million at December 31, 2016 and 2015 , 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, 2016 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: (In thousands) December 31, 2016 December 31, 2015 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Company common stock $ 10,170 $ 10,170 $ 6,482 $ 6,482 Mutual funds: Debt 5,810 5,810 5,250 5,250 Guaranteed deposit account $ 11,082 11,082 $ 9,484 9,484 In addition to the investments listed in the previous table, as of December 31, 2016 , pension plan investments valued using NAV as the practical expedient for fair value consist of $91.9 million in equity investments, $28.8 million in debt investments, and $8.1 million in real estate investments, which are in pooled separate accounts, as well as $5.1 million in limited partnerships. As of December 31, 2015 , pension plan investments valued using NAV as the practical expedient for fair value consist of $88.4 million in equity investments, $31.7 million in debt instruments, and $9.9 million in real estate investments, which are in pooled separate accounts, as well as $6.2 million in limited partnerships. No transfers of assets occurred among Levels 1, 2 or 3 during 2016 or 2015 . 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 as 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, 2016 0.979009 - 1.036866 (actual = 1.021418) 2015 0.995927 - 1.049539 (actual = 1.042254) 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, 2016 . The following presents additional information as of December 31, 2016 and 2015 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, 2016 2015 (In thousands) Guaranteed deposit account Guaranteed deposit account Balance at beginning of year $ 9,484 $ 11,515 Net decreases included in plan statement of change in net assets available for benefits: Net operating fees and expenses (481 ) (376 ) Net depreciation in fair value of investments: Unrealized (151 ) (628 ) Interest and dividends 232 284 Purchases 14,974 10,428 Sales (12,976 ) (11,739 ) Balance at end of year $ 11,082 $ 9,484 Shares of Company common stock were 233,849 and at both December 31, 2016 and 2015 . Dividends received by the plan were approximately $65 thousand in 2016 and $56 thousand in 2015 . 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 $26.1 million in 2016 , $25.5 million in 2015 , and $24.3 million in 2014 . 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 both 2016 and 2015 decreasing from a 2% rate in 2014 . The profit sharing expense amounted to $6.3 million for 2016 , $6.1 million for 2015 and $12.0 million for 2014 . 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, 2016
Fair Value Disclosures [Abstract]
Fair Value	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 Securities Valuation Committee 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 measure fair value for approximately 91% of our AFS Level 2 securities. Fair value measurements for other AFS Level 2 securities generally use certain inputs corroborated by market data and include standard discounted cash flow analysis. 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 LIBOR swap curves. Our valuation methodology for non-rated municipal securities changed at year-end of 2015 to utilize more observable inputs, primarily municipal market yield curves, 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 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 majority of these investments are held in Zions’ Small Business Investment Company and are early stage venture investments. The fair value measurements of these investments are reviewed on a quarterly basis by the Securities Valuation Committee. The Equity Investments Committee, consisting of executives familiar with the investments, reviews periodic financial information, including audited financial statements when available. Certain valuation 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. A significant change in the expected performance of the individual investment would result in a change in the fair value measurement of the investment. 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 Volcker Rule. See discussions in Notes 5 and 17 . Agriculture Loan Servicing This asset results from our servicing of agriculture loans approved and funded by Federal Agricultural Mortgage Corporation (“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. Exchange-traded derivatives consist of foreign currency exchange contracts measured under Level 1 because they are traded in active markets. Over-the-counter 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, 2016 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: U.S. Treasury, agencies and corporations $ — $ 12,009,676 $ — $ 12,009,676 Municipal securities 1,154,210 1,154,210 Other debt securities 23,892 23,892 Money market mutual funds and other 183,699 717 184,416 183,699 13,188,495 — 13,372,194 Trading account 114,803 114,803 Other noninterest-bearing investments: Bank-owned life insurance 497,466 497,466 Private equity investments 128,654 128,654 Other assets: Agriculture loan servicing and interest-only strips 20,248 20,248 Deferred compensation plan assets 91,040 91,040 Derivatives: Interest rate related and other 4,165 4,165 Interest rate swaps for customers 48,754 48,754 Foreign currency exchange contracts 11,276 11,276 11,276 52,919 — 64,195 $ 286,015 $ 13,853,683 $ 148,902 $ 14,288,600 LIABILITIES Securities sold, not yet purchased $ 25,321 $ — $ — $ 25,321 Other liabilities: Deferred compensation plan obligations 91,040 91,040 Derivatives: Interest rate related and other 1,499 1,499 Interest rate swaps for customers 49,050 49,050 Foreign currency exchange contracts 8,672 8,672 8,672 50,549 — 59,221 $ 125,033 $ 50,549 $ — $ 175,582 (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 $ 132,489 $ 54,678 $ — $ 187,167 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, 2016 (In thousands) Municipal Trust Other Private Ag loan svcg and int-only strips Derivatives Balance at December 31, 2015 $ — $ — $ — $ 120,027 $ 13,514 $ — Total net gains (losses) included in: Statement of income: Dividends and other investment loss (1,340 ) Equity securities gains, net 5,325 Other noninterest income 7,549 Purchases 19,174 368 Sales (3,673 ) Redemptions and paydowns (10,859 ) (1,183 ) Balance at December 31, 2016 $ — $ — $ — $ 128,654 $ 20,248 $ — 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 $ — 1 Real Estate Investment Trust No transfers of assets or liabilities occurred among Levels 1, 2 or 3 for 2016 and 2015 . 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, 2016 2015 Dividends and other investment loss $ — $ (2 ) Equity securities gains (losses), net 5,727 (11,311 ) Fixed income securities losses, net — (137,641 ) 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, 2016 Gains (losses) from Level 1 Level 2 Level 3 Total ASSETS Private equity investments, carried at cost $ — $ — $ 1,297 $ 1,297 $ (522 ) Impaired loans — 51,842 — 51,842 (36,276 ) Other real estate owned — 871 — 871 (1,871 ) $ — $ 52,713 $ 1,297 $ 54,010 $ (38,669 ) (In thousands) Fair value at December 31, 2015 Gains (losses) from 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 ) 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 $3.7 million in 2016 and $4.0 million in 2015 from the sale of OREO properties that had a carrying value at the time of sale of approximately $12.8 million in 2016 and $19.2 million in 2015 . Previous to their sale in these years, we recognized impairment on these properties of $0.2 million in 2016 and $0.6 million in 2015 . 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 $13.3 million and $25.3 million at December 31, 2016 and 2015 , respectively. Amounts of other noninterest-bearing investments carried at cost were $211.4 million and $191.5 million at December 31, 2016 and 2015 , 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 collateral 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 sufficiently 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, 2016 December 31, 2015 (In thousands) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 867,904 $ 850,473 2 $ 545,648 $ 552,088 2 Loans and leases (including loans held for sale), net of allowance 42,253,677 42,110,544 3 40,193,374 39,535,365 3 Financial liabilities: Time deposits 2,756,810 2,743,885 2 2,130,680 2,129,742 2 Foreign deposits — — 2 294,391 294,321 2 Other short-term borrowings 500,000 500,000 2 — — 2 Long-term debt (less fair value hedges) 534,850 551,881 2 812,366 838,796 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, federal funds purchased and other short-term borrowings, 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. 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, 2016
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. Following the close of business on December 31, 2015, we completed the merger of our subsidiary banks and certain non-banking subsidiaries, including Zions Management Services Company (“ZMSC”), with and into a single bank, ZB, N.A. We continue to manage our banking operations under our existing brand names, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. Performance assessment and resource allocation are based upon this geographical structure. Due to the charter consolidation, we have moved to an internal Funds Transfer Pricing (“FTP”) allocation system to report results of operations for business segments. This process continues to be refined. Total loans and deposits presented for the banking segments do not include intercompany amounts between banking segments, but may include deposits with the Other segment. Prior period amounts have been reclassified to reflect these changes. As of December 31, 2016 , 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 98 branches in Utah, 23 branches in Idaho, and one branch in Wyoming. CB&T operates 93 branches in California. Amegy operates 74 branches in Texas. NBAZ operates 58 branches in Arizona. NSB operates 50 branches in Nevada. Vectra operates 36 branches in Colorado and one branch in New Mexico. TCBW operates one branch in Washington and one branch in Oregon. The operating segment identified as “Other” includes the Parent, Zions Management Services Company (which was merged into Zions First National Bank on December 31, 2015), certain nonbank financial service subsidiaries, centralized back-office functions of the Bank, the Parent and eliminations of transactions between segments. The major components of net interest income at the Bank’s back-office include the revenue associated with the investments securities portfolio and the offset of the FTP costs and benefits provided to the business segments. Throughout 2016 consolidation efforts continued, which resulted in transitioning full-time equivalent from the business segments to the Company’s back-office units. Due to the continuing nature and timing of this change, the Company’s back-office units retained more direct expenses in 2016 than in prior years. With the consolidation efforts largely completed, allocations of these expenses in future periods to the business segments will result in the “Other” segment’s noninterest expenses that are more consistent with historical levels going forward. The following schedule does not present total assets or income tax expense for each operating segment, but instead presents total loans, total deposits and income before income taxes because these are the metrics that management uses when evaluating and making decisions pertaining to the operating segments. The major components at the Parent include net interest income, which includes interest expense on other borrowed funds, net impairment losses on investment securities, and losses from the sale of the remaining CDO portfolio. 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. 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. The following is a summary of selected operating segment information: (In millions) Zions Bank Amegy CB&T 2016 2015 2014 2016 2015 2014 2016 2015 2014 SELECTED INCOME STATEMENT DATA Net interest income $ 633.1 $ 614.9 $ 628.8 $ 479.5 $ 475.4 $ 466.4 $ 450.0 $ 425.6 $ 444.1 Provision for loan losses (21.6 ) (28.3 ) (58.5 ) 163.0 91.3 32.2 (9.1 ) (4.4 ) (20.1 ) Net interest income after provision for loan losses 654.7 643.2 687.3 316.5 384.1 434.2 459.1 430.0 464.2 Noninterest income 148.6 132.7 143.0 122.5 120.6 127.5 67.2 63.4 60.6 Noninterest expense 392.5 430.7 439.9 317.1 372.7 357.3 268.2 294.2 321.3 Income (loss) before income taxes $ 410.8 $ 345.2 $ 390.4 $ 121.9 $ 132.0 $ 204.4 $ 258.1 $ 199.2 $ 203.5 SELECTED BALANCE SHEET DATA Total loans $ 12,560 $ 12,232 $ 12,172 $ 10,557 $ 10,115 $ 10,077 $ 9,381 $ 8,832 $ 8,530 Total deposits 16,764 16,233 16,214 11,924 11,677 11,491 10,969 10,520 9,707 (In millions) NBAZ NSB Vectra 2016 2015 2014 2016 2015 2014 2016 2015 2014 SELECTED INCOME STATEMENT DATA Net interest income $ 196.7 $ 181.8 $ 181.1 $ 124.8 $ 125.3 $ 125.4 $ 123.1 $ 117.2 $ 114.0 Provision for loan losses (3.1 ) 7.9 (21.5 ) (28.4 ) (28.3 ) (20.9 ) (7.9 ) 4.7 (8.4 ) Net interest income after provision for loan losses 199.8 173.9 202.6 153.2 153.6 146.3 131.0 112.5 122.4 Noninterest income 39.7 36.1 33.5 39.4 36.3 34.9 22.8 21.3 22.3 Noninterest expense 129.9 132.7 145.1 123.5 131.3 132.7 87.3 97.6 98.3 Income (loss) before income taxes $ 109.6 $ 77.3 $ 91.0 $ 69.1 $ 58.6 $ 48.5 $ 66.5 $ 36.2 $ 46.4 SELECTED BALANCE SHEET DATA Total loans $ 4,292 $ 3,909 $ 3,750 $ 2,344 $ 2,285 $ 2,421 $ 2,528 $ 2,468 $ 2,320 Total deposits 4,609 4,369 4,133 4,243 4,035 3,690 2,842 2,889 2,591 (In millions) TCBW Other Consolidated Company 2016 2015 2014 2016 2015 2014 2016 2015 2014 SELECTED INCOME STATEMENT DATA Net interest income $ 39.5 $ 34.6 $ 34.6 $ (179.3 ) $ (259.5 ) $ (314.4 ) $ 1,867.4 $ 1,715.3 $ 1,680.0 Provision for loan losses (0.2 ) (2.9 ) (0.9 ) 0.1 — — 92.8 40.0 (98.1 ) Net interest income after provision for loan losses 39.7 37.5 35.5 (179.4 ) (259.5 ) (314.4 ) 1,774.6 1,675.3 1,778.1 Noninterest income 4.6 4.1 4.1 70.8 (57.3 ) 66.8 515.6 357.2 492.7 Noninterest expense 18.6 16.5 33.4 248.2 104.9 121.4 1,585.3 1,580.6 1,649.4 Income (loss) before income taxes $ 25.7 $ 25.1 $ 6.2 $ (356.8 ) $ (421.7 ) $ (369.0 ) $ 704.9 $ 451.9 $ 621.4 SELECTED BALANCE SHEET DATA Total loans $ 870 $ 704 $ 713 $ 117 $ 105 $ 81 $ 42,649 $ 40,650 $ 40,064 Total deposits 1,161 986 816 724 (335 ) (794 ) 53,236 50,374 47,848

Quarterly Financial Information

Quarterly Financial Information	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	22. QUARTERLY FINANCIAL INFORMATION (UNAUDITED) Financial information by quarter for 2016 and 2015 is as follows: Quarters (In thousands, except per share amounts) First Second Third Fourth Year 2016 Gross interest income $ 474,901 $ 486,952 $ 490,695 $ 501,766 $ 1,954,314 Net interest income 452,842 464,849 469,187 480,470 1,867,348 Provision for loan losses 42,145 34,492 18,825 (2,687 ) 92,775 Noninterest income: Investment securities gains (losses), net (522 ) 2,734 8,480 (3,422 ) 7,270 Other noninterest income 117,283 122,983 136,407 131,666 508,339 Noninterest expense 395,573 381,894 403,292 404,515 1,585,274 Income before income taxes 131,885 174,180 191,957 206,886 704,908 Net income 90,437 113,949 127,263 137,401 469,050 Preferred stock dividends (11,660 ) (13,543 ) (10,368 ) (12,411 ) (47,982 ) Preferred stock redemption — (9,759 ) — — (9,759 ) Net earnings applicable to common shareholders 78,777 90,647 116,895 124,990 411,309 Net earnings per common share: Basic $ 0.38 $ 0.44 $ 0.57 $ 0.61 $ 2.00 Diluted 0.38 0.44 0.57 0.60 1.99 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 114,224 128,915 122,367 118,595 484,101 Noninterest expense 392,977 398,997 391,280 397,353 1,580,607 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 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, 2016
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, 2016 2015 ASSETS Cash and due from banks $ 2,023 $ 18,375 Interest-bearing deposits 528,531 775,649 Security resell agreements — 100,000 Investment securities: Available-for-sale, at fair value 40,258 45,168 Other noninterest-bearing investments 28,719 28,178 Investments in subsidiaries: Commercial bank 7,570,521 7,312,654 Other subsidiaries 6,126 84,010 Receivables from subsidiaries: Other subsidiaries — 60 Other assets 80,715 78,728 $ 8,256,893 $ 8,442,822 LIABILITIES AND SHAREHOLDERS’ EQUITY Other liabilities $ 88,477 $ 123,849 Subordinated debt to affiliated trusts — 164,950 Long-term debt: Due to others 534,110 646,504 Total liabilities 622,587 935,303 Shareholders’ equity: Preferred stock 709,601 828,490 Common stock 4,724,715 4,766,731 Retained earnings 2,321,571 1,966,910 Accumulated other comprehensive loss (121,581 ) (54,612 ) Total shareholders’ equity 7,634,306 7,507,519 $ 8,256,893 $ 8,442,822 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, 2016 2015 2014 Interest income: Commercial bank $ 559 $ 1,162 $ 1,489 Other subsidiaries 3 3 16 Other loans and securities 2,015 3,014 10,900 Total interest income 2,577 4,179 12,405 Interest expense: Affiliated trusts 3,484 4,308 4,265 Other borrowed funds 33,651 63,665 117,700 Total interest expense 37,135 67,973 121,965 Net interest loss (34,558 ) (63,794 ) (109,560 ) Other income: Dividends from consolidated subsidiaries: Commercial bank 263,149 233,853 236,012 Other subsidiaries — 100 400 Equity and fixed income securities gains, net — 37,161 300,275 Other income 4,490 12,512 6,475 267,639 283,626 543,162 Expenses: Salaries and employee benefits 22,868 24,674 17,457 Debt extinguishment cost 353 135 44,422 Other operating expenses (13,543 ) 10,473 10,559 9,678 35,282 72,438 Income before income taxes and undistributed income of consolidated subsidiaries 223,403 184,550 361,164 Income tax expense (benefit) (19,006 ) (27,140 ) 55,865 Income before equity in undistributed income of consolidated subsidiaries 242,409 211,690 305,299 Equity in undistributed income (loss) of consolidated subsidiaries: Commercial bank 230,167 108,350 97,673 Other subsidiaries (3,526 ) (10,569 ) (4,510 ) Net income 469,050 309,471 398,462 Preferred stock dividends (47,982 ) (62,857 ) (71,894 ) Preferred stock redemption (9,759 ) — — Net earnings applicable to common shareholders $ 411,309 $ 246,614 $ 326,568 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, 2016 2015 2014 CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 469,050 $ 309,471 $ 398,462 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed net income of consolidated subsidiaries (226,641 ) (97,781 ) (93,163 ) Debt extinguishment cost 353 135 44,422 Other, net (31,048 ) 78,580 149,280 Net cash provided by operating activities 211,714 290,405 499,001 CASH FLOWS FROM INVESTING ACTIVITIES Net decrease (increase) in money market investments 347,118 132,267 (1,007,844 ) Collection of advances to subsidiaries 60 56,000 15,000 Advances to subsidiaries — (41,000 ) (30,060 ) Proceeds from sales and maturities of investment securities 3,878 124,419 372,357 Purchases of investment securities — (46,851 ) — Decrease of investment in subsidiaries — 15,000 6,310 Other, net 7,342 4,010 24,319 Net cash provided by (used in) investing activities 358,398 243,845 (619,918 ) CASH FLOWS FROM FINANCING ACTIVITIES Repayments of long-term debt (279,948 ) (271,120 ) (1,147,641 ) Debt extinguishment cost paid (353 ) (135 ) (35,435 ) Proceeds from issuance of common stock 25,072 22,392 526,438 Cash paid for preferred stock redemptions (126,144 ) (175,669 ) — Common stock redeemed and retired (97,240 ) (6,681 ) (5,589 ) Dividends paid on preferred stock (50,098 ) (62,857 ) (64,868 ) Dividends paid on common stock (57,753 ) (45,198 ) (31,262 ) Other, net — (381 ) (30 ) Net cash used in financing activities (586,464 ) (539,649 ) (758,387 ) Net decrease in cash and due from banks (16,352 ) (5,399 ) (879,304 ) Cash and due from banks at beginning of year 18,375 23,774 903,078 Cash and due from banks at end of year $ 2,023 $ 18,375 $ 23,774 The Parent paid interest of $35.0 million in 2016 , $51.4 million in 2015 , and $100.6 million in 2014 . 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, 2016
Accounting Policies [Abstract]
Business	Business Zions Bancorporation (“the Parent”) is a financial holding company headquartered in Salt Lake City, Utah, which owns and operates a commercial bank. The Parent and its subsidiaries (collectively “the Company”) provide a full range of banking and related services in 11 Western and Southwestern states through seven separately managed and branded units as follows: Zions Bank, in Utah, Idaho and Wyoming; California Bank & Trust (“CB&T”); Amegy Bank (“Amegy”), in Texas; National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“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 where we have the ability to exercise significant influence over the operating and financial policies of the respective investee are accounted for using the equity method of accounting; those that are not consolidated or accounted for using the equity method of accounting are accounted for under cost or fair value 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. 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.
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, 2016 and 2015 , 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, 2016 , we held $347 million of securities for which we were permitted by contract to sell or repledge. Security resell agreements averaged $464 million during 2016 , and the maximum amount outstanding at any month-end during 2016 was $2.2 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. 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. We evaluate loans throughout their lives for signs of credit deterioration, which may impact the loan’s status, and potentially impact our accounting for that loan. Loan status categories include past due as to contractual payments, nonaccrual, impaired, and restructured (including trouble debt restructurings “TDRs”). Our accounting policies for these loan statuses and our estimation of the related allowance for loan losses (“ALLL”) 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 ALLL and the reserve for unfunded lending commitments (“RULC”), 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	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).
Nonmarketable Securities	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 fair value. 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 (“CSVs”) 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, Equipment and Software, Net Premises, equipment and software, 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 Core Transformation project to install 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	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.
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 ALLL. The RULC is presented separately in the balance sheet.
Revenue Recognition, Policy [Policy Text Block]	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 Share-based compensation generally includes grants of stock options, restricted stock, restricted stock units (“RSUs”), 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, RSUs, and stock warrants are converted to common stock equivalents using the treasury stock 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, 2016
Supplemental Cash Flow Information [Abstract]
Schedule Of Noncash Activities	Noncash activities are summarized as follows: (In thousands) Year Ended December 31, 2016 2015 2014 Loans held for investment transferred to other real estate owned $ 14,632 $ 11,924 $ 25,189 Loans held for investment reclassified to (from) loans held for sale, net 50,353 5,048 (26,272 ) Adjusted cost of HTM securities reclassified as AFS securities — 79,276 — AFS securities purchased, not settled 395,079 — —

Offsetting Assets and Liabili34

Offsetting Assets and Liabilities Gross and net information for selecting financial instruments (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value, by Balance Sheet Grouping [Table Text Block]	December 31, 2016 (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 $ 568,334 $ — $ 568,334 $ — $ — $ 568,334 Derivatives (included in other assets) 64,195 — 64,195 (17,118 ) (162 ) 46,915 $ 632,529 $ — $ 632,529 $ (17,118 ) $ (162 ) $ 615,249 Liabilities: Federal funds and other short-term borrowings $ 827,269 $ — $ 827,269 $ — $ — $ 827,269 Derivatives (included in other liabilities) 59,221 — 59,221 (17,118 ) (16,570 ) 25,533 $ 886,490 $ — $ 886,490 $ (17,118 ) $ (16,570 ) $ 852,802 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 (6,990 ) 70,648 $ 697,396 $ — $ 697,396 $ (6,990 ) $ — $ 690,406 Liabilities: Federal funds and other short-term borrowings $ 346,987 $ — $ 346,987 $ — $ — $ 346,987 Derivatives (included in other liabilities) 72,568 — 72,568 (6,990 ) (60,923 ) 4,655 $ 419,555 $ — $ 419,555 $ (6,990 ) $ (60,923 ) $ 351,642 December 31, 2016 December 31, 2015 (In thousands) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 867,904 $ 850,473 2 $ 545,648 $ 552,088 2 Loans and leases (including loans held for sale), net of allowance 42,253,677 42,110,544 3 40,193,374 39,535,365 3 Financial liabilities: Time deposits 2,756,810 2,743,885 2 2,130,680 2,129,742 2 Foreign deposits — — 2 294,391 294,321 2 Other short-term borrowings 500,000 500,000 2 — — 2 Long-term debt (less fair value hedges) 534,850 551,881 2 812,366 838,796 2

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2016
Investments [Abstract]
Summary Of Investment Securities	December 31, 2016 (In thousands) Amortized cost Gross unrealized gains Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 867,904 $ 5,975 $ 23,406 $ 850,473 Available-for-sale U.S. Government agencies and corporations: Agency securities 1,845,825 2,338 9,188 1,838,975 Agency guaranteed mortgage-backed securities 7,985,630 6,596 109,392 7,882,834 Small Business Administration loan-backed securities 2,297,935 8,439 18,507 2,287,867 Municipal securities 1,181,560 969 28,319 1,154,210 Other debt securities 25,359 103 1,570 23,892 13,336,309 18,445 166,976 13,187,778 Money market mutual funds and other 184,407 9 — 184,416 13,520,716 18,454 166,976 13,372,194 Total $ 14,388,620 $ 24,429 $ 190,382 $ 14,222,667 December 31, 2015 (In thousands) Amortized Gross Gross Estimated 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
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 $ 181,416 $ 181,686 $ 1,548,685 $ 1,532,345 Due after one year through five years 276,753 276,470 4,971,404 4,920,537 Due after five years through ten years 198,667 195,541 4,305,373 4,251,664 Due after ten years 211,068 196,776 2,510,847 2,483,232 $ 867,904 $ 850,473 $ 13,336,309 $ 13,187,778
Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value	December 31, 2016 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 $ 15,754 $ 467,056 $ 7,652 $ 61,389 $ 23,406 $ 528,445 Available-for-sale U.S. Government agencies and corporations: Agency securities 8,682 949,608 506 127,249 9,188 1,076,857 Agency guaranteed mortgage-backed securities 102,524 6,649,246 6,868 326,417 109,392 6,975,663 Small Business Administration loan-backed securities 2,490 527,472 16,017 840,535 18,507 1,368,007 Municipal securities 28,077 991,973 242 9,103 28,319 1,001,076 Other — — 1,570 13,433 1,570 13,433 141,773 9,118,299 25,203 1,316,737 166,976 10,435,036 Mutual funds and other — — — — — — 141,773 9,118,299 25,203 1,316,737 166,976 10,435,036 Total $ 157,527 $ 9,585,355 $ 32,855 $ 1,378,126 $ 190,382 $ 10,963,481 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 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 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
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) 2016 2015 HTM AFS Total HTM AFS Total Balance of credit-related OTTI at beginning of year $ — $ — $ — $ (9,079 ) $ (95,472 ) $ (104,551 ) Transfers from HTM to AFS — — — 9,079 (9,079 ) — Reductions for securities sold or paid off during the year — — — — 104,551 104,551 Balance of credit-related OTTI at end of year $ — $ — $ — $ — $ — $ — 1 Relates to securities not previously impaired. 2 Relates to additional impairment on securities previously impaired.
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: 2016 2015 2014 (In thousands) Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Investment securities: Held-to-maturity $ 12 $ — $ 1 $ — $ 18 $ 27 Available-for-sale 120 30 8,443 147,656 92,525 83,815 Other noninterest-bearing investments 21,176 14,008 25,045 12,693 23,706 8,544 21,308 14,038 33,489 160,349 116,249 92,386 Net gains (losses) $ 7,270 $ (126,860 ) $ 23,863 Statement of income information: Net impairment losses on investment securities $ — $ — $ (27 ) Equity securities gains, net 7,168 11,875 13,471 Fixed income securities gains (losses), net 102 (138,735 ) 10,419 Net gains (losses) $ 7,270 $ (126,860 ) $ 23,863
Tax and Nontaxable Interest Income by Investment Type [Table Text Block]	(In thousands) 2016 2015 2014 Taxable Nontaxable Total Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 10,306 $ 12,628 $ 22,934 $ 12,777 $ 10,892 $ 23,669 $ 14,770 $ 11,264 $ 26,034 Available-for-sale 166,281 11,582 177,863 94,877 3,326 98,203 71,365 2,558 73,923 Trading 3,123 — 3,123 2,214 — 2,214 1,979 — 1,979 $ 179,710 $ 24,210 $ 203,920 $ 109,868 $ 14,218 $ 124,086 $ 88,114 $ 13,822 $ 101,936

Loans And Allowance For Credi36

Loans And Allowance For Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2016
Loans And Allowance For Credit Losses [Abstract]
Summary Of Major Portfolio Segment And Specific Loan Class	December 31, (In thousands) 2016 2015 Loans held for sale $ 171,934 $ 149,880 Commercial: Commercial and industrial $ 13,451,886 $ 13,211,481 Leasing 422,969 441,666 Owner-occupied 6,961,807 7,150,028 Municipal 778,335 675,839 Total commercial 21,614,997 21,479,014 Commercial real estate: Construction and land development 2,018,655 1,841,502 Term 9,322,138 8,514,401 Total commercial real estate 11,340,793 10,355,903 Consumer: Home equity credit line 2,645,192 2,416,357 1-4 family residential 5,890,714 5,382,099 Construction and other consumer real estate 486,712 385,240 Bankcard and other revolving plans 481,063 443,780 Other 189,794 187,149 Total consumer 9,693,475 8,814,625 Total loans $ 42,649,265 $ 40,649,542
Summary Of Changes in The Allowance For Credit Losses	December 31, 2016 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of year $ 454,277 $ 113,992 $ 37,779 $ 606,048 Additions: Provision for loan losses 92,796 217 (238 ) 92,775 Adjustment for FDIC-supported/PCI loans — — — — Deductions: Gross loan and lease charge-offs (169,260 ) (12,146 ) (15,959 ) (197,365 ) Recoveries 42,907 13,864 9,293 66,064 Net loan and lease (charge-offs) recoveries (126,353 ) 1,718 (6,666 ) (131,301 ) Balance at end of year $ 420,720 $ 115,927 $ 30,875 $ 567,522 Reserve for unfunded lending commitments Balance at beginning of year $ 57,696 $ 16,526 $ 616 $ 74,838 Provision credited to earnings (3,464 ) (5,847 ) (616 ) (9,927 ) Balance at end of year $ 54,232 $ 10,679 $ — $ 64,911 Total allowance for credit losses Allowance for loan losses $ 420,720 $ 115,927 $ 30,875 $ 567,522 Reserve for unfunded lending commitments 54,232 10,679 — 64,911 Total allowance for credit losses $ 474,952 $ 126,606 $ 30,875 $ 632,433 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 (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
Summary Of ALLL And Outstanding Loan Balances According To The Company's Impairment Method	December 31, 2016 (In thousands) Commercial Commercial real estate Consumer Total Allowance for loan losses Individually evaluated for impairment $ 55,951 $ 2,620 $ 5,995 $ 64,566 Collectively evaluated for impairment 364,703 113,202 24,483 502,388 Purchased loans with evidence of credit deterioration 66 105 397 568 Total $ 420,720 $ 115,927 $ 30,875 $ 567,522 Outstanding loan balances Individually evaluated for impairment $ 466,187 $ 78,190 $ 75,063 $ 619,440 Collectively evaluated for impairment 21,111,071 11,230,486 9,611,096 41,952,653 Purchased loans with evidence of credit deterioration 37,739 32,117 7,316 77,172 Total $ 21,614,997 $ 11,340,793 $ 9,693,475 $ 42,649,265 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
Summary Of Nonaccrual Loans	Nonaccrual loans are summarized as follows: December 31, (In thousands) 2016 2015 Loans held for sale $ 40,330 $ — Commercial: Commercial and industrial $ 354,172 $ 163,906 Leasing 13,920 3,829 Owner-occupied 73,794 73,881 Municipal 852 951 Total commercial 442,738 242,567 Commercial real estate: Construction and land development 7,109 7,045 Term 29,012 40,253 Total commercial real estate 36,121 47,298 Consumer: Home equity credit line 10,842 8,270 1-4 family residential 35,577 50,254 Construction and other consumer real estate 1,677 748 Bankcard and other revolving plans 1,235 537 Other 139 186 Total consumer loans 49,470 59,995 Total $ 528,329 $ 349,860
Summary Of Past Due Loans (Accruing And Nonaccruing)	Past due loans (accruing and nonaccruing) are summarized as follows: December 31, 2016 (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 Loans held for sale $ 171,934 $ — $ — $ — $ 171,934 $ — $ 40,330 Commercial: Commercial and industrial $ 13,306,132 $ 71,446 $ 74,308 $ 145,754 $ 13,451,886 $ 10,321 $ 286,883 Leasing 422,969 — — — 422,969 — 13,920 Owner-occupied 6,893,739 40,655 27,413 68,068 6,961,807 7,450 43,148 Municipal 778,334 — 1 1 778,335 1 852 Total commercial 21,401,174 112,101 101,722 213,823 21,614,997 17,772 344,803 Commercial real estate: Construction and land development 2,009,344 7,208 2,103 9,311 2,018,655 368 310 Term 9,290,756 8,806 22,576 31,382 9,322,138 12,349 18,469 Total commercial real estate 11,300,100 16,014 24,679 40,693 11,340,793 12,717 18,779 Consumer: Home equity credit line 2,635,321 3,868 6,003 9,871 2,645,192 1,500 4,474 1-4 family residential 5,857,429 11,982 21,303 33,285 5,890,714 121 11,342 Construction and other consumer real estate 479,383 3,258 4,071 7,329 486,712 2,557 162 Bankcard and other revolving plans 477,426 2,406 1,231 3,637 481,063 1,181 1,151 Other 189,044 711 39 750 189,794 — 70 Total consumer loans 9,638,603 22,225 32,647 54,872 9,693,475 5,359 17,199 Total $ 42,339,877 $ 150,340 $ 159,048 $ 309,388 $ 42,649,265 $ 35,848 $ 380,781 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 Loans held for sale $ 149,880 $ — $ — $ — $ 149,880 $ — $ — 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 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, 2016 (In thousands) Pass Special mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 12,184,707 $ 266,027 $ 997,872 $ 3,280 $ 13,451,886 Leasing 387,275 4,689 30,017 988 422,969 Owner-occupied 6,560,030 96,464 305,313 — 6,961,807 Municipal 765,025 7,236 6,074 — 778,335 Total commercial 19,897,037 374,416 1,339,276 4,268 21,614,997 $ 420,720 Commercial real estate: Construction and land development 1,941,411 51,931 25,313 — 2,018,655 Term 9,096,745 81,698 143,695 — 9,322,138 Total commercial real estate 11,038,156 133,629 169,008 — 11,340,793 115,927 Consumer: Home equity credit line 2,629,285 — 15,907 — 2,645,192 1-4 family residential 5,850,771 — 39,943 — 5,890,714 Construction and other consumer real estate 482,167 — 4,545 — 486,712 Bankcard and other revolving plans 477,756 — 3,307 — 481,063 Other 189,360 — 434 — 189,794 Total consumer loans 9,629,339 — 64,136 — 9,693,475 30,875 Total $ 40,564,532 $ 508,045 $ 1,572,420 $ 4,268 $ 42,649,265 $ 567,522 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
Summary Of Information On Impaired Loans	December 31, 2016 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 $ 469,880 $ 82,197 $ 310,740 $ 392,937 $ 52,164 $ 332,775 $ 4,783 Owner-occupied 110,779 70,983 29,713 100,696 3,138 98,903 9,082 Municipal 1,331 852 — 852 — 892 — Total commercial 581,990 154,032 340,453 494,485 55,302 432,570 13,865 Commercial real estate: Construction and land development 21,891 7,093 6,614 13,707 224 10,906 2,325 Term 78,991 52,987 16,725 69,712 1,305 76,421 12,810 Total commercial real estate 100,882 60,080 23,339 83,419 1,529 87,327 15,135 Consumer: Home equity credit line 24,531 15,466 6,831 22,297 477 21,680 1,324 1-4 family residential 59,271 27,366 28,430 55,796 5,549 56,573 1,683 Construction and other consumer real estate 3,128 859 1,763 2,622 364 2,487 132 Bankcard and other revolving plans — — — — — — 18 Other 1,592 1,110 30 1,140 2 2,019 353 Total consumer loans 88,522 44,801 37,054 81,855 6,392 82,759 3,510 Total $ 771,394 $ 258,913 $ 400,846 $ 659,759 $ 63,223 $ 602,656 $ 32,510 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
Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type	December 31, 2016 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 $ 241 $ 18,674 $ — $ 67 $ 43 $ 27,679 $ 46,704 Owner-occupied 2,543 191 887 — 7,832 10,616 22,069 Total commercial 2,784 18,865 887 67 7,875 38,295 68,773 Commercial real estate: Construction and land development 40 3,425 — — — 3,414 6,879 Term 4,491 224 162 979 1,776 10,403 18,035 Total commercial real estate 4,531 3,649 162 979 1,776 13,817 24,914 Consumer: Home equity credit line 195 1,451 9,903 4 161 2,554 14,268 1-4 family residential 2,301 419 6,476 252 2,608 29,487 41,543 Construction and other consumer real estate 160 226 13 — — 897 1,296 Other — — 122 — — — 122 Total consumer loans 2,656 2,096 16,514 256 2,769 32,938 57,229 Total accruing 9,971 24,610 17,563 1,302 12,420 85,050 150,916 Nonaccruing Commercial: Commercial and industrial 775 185 — 1,085 33,037 24,716 59,798 Owner-occupied 601 837 — 2,821 1,045 12,482 17,786 Municipal — 852 — — — — 852 Total commercial 1,376 1,874 — 3,906 34,082 37,198 78,436 Commercial real estate: Construction and land development — 39 — — 1,725 — 1,764 Term 1,659 1,058 — — 2,474 2,939 8,130 Total commercial real estate 1,659 1,097 — — 4,199 2,939 9,894 Consumer: Home equity credit line — 431 1,036 35 — 670 2,172 1-4 family residential — 158 1,643 292 1,253 4,830 8,176 Construction and other consumer real estate — 88 92 1,145 1 — 1,326 Total consumer loans — 677 2,771 1,472 1,254 5,500 11,674 Total nonaccruing 3,035 3,648 2,771 5,378 39,535 45,637 100,004 Total $ 13,006 $ 28,258 $ 20,334 $ 6,680 $ 51,955 $ 130,687 $ 250,920 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 Other — — — — — — — 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 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 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) 2016 2015 Commercial: Commercial and industrial $ (297 ) $ (261 ) Owner-occupied (200 ) (279 ) Total commercial (497 ) (540 ) Commercial real estate: Construction and land development (4 ) (90 ) Term (278 ) (378 ) Total commercial real estate (282 ) (468 ) Consumer: Home equity credit line — (2 ) 1-4 family residential (825 ) (1,037 ) Construction and other consumer real estate (19 ) (27 ) Total consumer loans (844 ) (1,066 ) Total decrease to interest income 1 $ (1,623 ) $ (2,074 ) 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, 2016 December 31, 2015 Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ 28 $ 618 $ 646 $ 883 $ 116 $ 999 Owner-occupied — 822 822 — 1,684 1,684 Total commercial 28 1,440 1,468 883 1,800 2,683 Commercial real estate: Construction and land development — — — — — — Term — — — — — — Total commercial real estate — — — — — — Consumer: Home equity credit line — 132 132 — — — 1-4 family residential — 308 308 — 722 722 Construction and other consumer real estate — 1,128 1,128 — — — Total consumer loans — 1,568 1,568 — 722 722 Total $ 28 $ 3,008 $ 3,036 $ 883 $ 2,522 $ 3,405 Note: Total loans modified as TDRs during the 12 months previous to December 31, 2016 and 2015 were $72.5 million and $134.0 million , respectively.
Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans	December 31, (In thousands) 2016 2015 Commercial $ 44,960 $ 72,440 Commercial real estate 38,670 65,167 Consumer 8,504 11,082 Outstanding balance $ 92,134 $ 148,689 Carrying amount $ 77,172 $ 125,029 Less ALLL 568 945 Carrying amount, net $ 76,604 $ 124,084
Schedule Of Changes In The Accretable Yield For PCI Loans	(In thousands) 2016 2015 Balance at beginning of year $ 39,803 $ 45,055 Accretion (24,479 ) (40,077 ) Reclassification from nonaccretable difference 11,167 22,190 Disposals and other 6,513 12,635 Balance at end of year $ 33,004 $ 39,803

Derivative Instruments And He37

Derivative Instruments And Hedging Activities Amount of Derivative Gain/Loss Recognized/Reclassified (Tables)	12 Months Ended
	Dec. 31, 2016
Summary of Derivative Instruments [Abstract]
Schedule of Derivative Instruments	December 31, 2016 December 31, 2015 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 $ 2,289 $ 1,148 $ 1,387,500 $ 5,461 $ 956 Total derivatives designated as hedging instruments 1,387,500 2,289 1,148 1,387,500 5,461 956 Derivatives not designated as hedging instruments Interest rate swaps 235,167 1,876 351 40,314 — 8 Interest rate swaps for customers 2 4,162,264 48,754 49,050 3,256,190 51,353 53,843 Foreign exchange 424,215 11,276 8,672 463,064 20,824 17,761 Total derivatives not designated as hedging instruments 4,821,646 61,906 58,073 3,759,568 72,177 71,612 Total derivatives $ 6,209,146 $ 64,195 $ 59,221 $ 5,147,068 $ 77,638 $ 72,568
Schedule Of Gain (Loss) Of Derivative Instruments	Year Ended December 31, 2016 Year Ended December 31, 2015 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 $ 7,912 $ 11,290 $ 12,124 $ 9,004 7,912 11,290 3 12,124 9,004 3 Fair value hedges: Terminated swaps on long-term debt $ — $ 1,504 Total derivatives designated as hedging instruments 7,912 11,290 — 12,124 9,004 1,504 Derivatives not designated as hedging instruments Interest rate swaps $ 1,096 $ — Interest rate swaps for customers 2 13,952 7,438 Futures contracts — 2 Foreign exchange 10,696 9,519 Total derivatives not designated as hedging instruments 25,744 16,959 Total derivatives $ 7,912 $ 11,290 $ 25,744 $ — $ 12,124 $ 9,004 $ 16,959 $ 1,504 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 $11.3 million for 2016 and $9.0 million for 2015 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, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortizing Intangible Assets	Gross carrying amount Accumulated amortization Net carrying amount (In thousands) 2016 2015 2016 2015 2016 2015 Core deposit intangibles $ 166,518 $ 166,518 $ (158,444 ) $ (151,157 ) $ 8,074 $ 15,361 Customer relationships and other intangibles 28,014 28,014 (27,668 ) (27,103 ) 346 911 Total $ 194,532 $ 194,532 $ (186,112 ) $ (178,260 ) $ 8,420 $ 16,272
Schedule Of Estimated Amortization Expense	(In thousands) 2017 $ 6,404 2018 1,557 2019 459 2020 — 2021 —
Schedule Of Goodwill	(In thousands) Zions Bank CB&T Amegy Consolidated Company 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 Impairment losses — — — — Balance at December 31, 2016 $ 19,514 $ 379,024 $ 615,591 $ 1,014,129

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Deposit Liabilities Disclosures [Text Block]	DEPOSITS At December 31, 2016 , the scheduled maturities of all time deposits were as follows: (In thousands) 2017 $ 2,139,822 2018 291,826 2019 110,993 2020 109,927 2021 103,738 Thereafter 504 Total $ 2,756,810 At December 31, 2016 , the contractual maturities of domestic time deposits with a denomination of $100,000 and over were as follows: $417 million in 3 months or less, $401 million over 3 months through 6 months, $679 million over 6 months through 12 months, and $364 million over 12 months. Domestic time deposits in denominations that meet or exceed the current FDIC insurance limit of $250,000 were $1.4 billion and $584 million at December 31, 2016 and 2015 , respectively. Domestic time deposits under $250,000 were $1.4 billion and $1.5 billion at December 31, 2016 and 2015 , respectively. As of December 31, 2016 there were no Foreign time deposits $250,000 and over, and $112 million at December 31, 2015 . Deposit overdrafts reclassified as loan balances were $11 million and $14 million at December 31, 2016 and 2015 , respectively.
Maturity of All Time Deposits [Table Text Block]	(In thousands) 2017 $ 2,139,822 2018 291,826 2019 110,993 2020 109,927 2021 103,738 Thereafter 504 Total $ 2,756,810

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
Short-term Debt [Line Items]
Summary Of Short-Term Borrowings	(In thousands) 2016 2015 2014 Federal funds purchased Average amount outstanding $ 104,866 $ 105,910 $ 104,358 Average rate 0.29 % 0.18 % 0.17 % Highest month-end balance 147,900 122,461 124,093 Year-end balance 105,563 111,263 100,193 Average rate on outstandings at year-end 0.51 % 0.25 % 0.15 % Security repurchase agreements Average amount outstanding 311,045 127,358 116,190 Average rate 0.23 % 0.11 % 0.06 % Highest month-end balance 823,744 205,566 156,710 Year-end balance 196,385 205,566 118,600 Average rate on outstandings at year-end 0.26 % 0.15 % 0.13 % Other short-term borrowings , year-end balances Securities sold, not yet purchased 25,321 30,158 24,230 Other 500,000 — 1,200 Total federal funds and other short-term borrowings $ 827,269 $ 346,987 $ 244,223

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Instrument [Line Items]
Schedule of Maturities of Long-term Debt [Table Text Block]	(In thousands) Consolidated Parent only 2017 $ 152,608 $ 152,411 2018 225 — 2019 259 — 2020 59 — 2021 — — Thereafter 381,699 381,699 Total $ 534,850 $ 534,110
Schedule Of Long-Term Debt	December 31, (In thousands) 2016 2015 Junior subordinated debentures related to trust preferred securities $ — $ 164,950 Subordinated notes 246,550 246,170 Senior notes 287,560 400,334 Capital lease obligations 740 912 Total $ 534,850 $ 812,366
Schedule Of Trust Preferred Securities	(In thousands) December 31, 2016 December 31, 2015 Coupon rate 1 Redemption Date Amegy Statutory Trust I $ — $ 51,547 3mL+2.85% (3.38%) September 17, 2016 Amegy Statutory Trust II — 36,083 3mL+1.90% (2.22%) October 7, 2016 Amegy Statutory Trust III — 61,856 3mL+1.78% (2.29%) September 15, 2016 Stockmen’s Statutory Trust II — 7,732 3mL+3.15% (3.75%) September 26, 2016 Stockmen’s Statutory Trust III — 7,732 3mL+2.89% (3.42%) September 17, 2016 Total $ — $ 164,950
Schedule Of Subordinated Notes	(In thousands) Subordinated notes Coupon rate Balance Par amount Maturity 5.65% $ 160,195 $ 162,000 Nov 2023 6.95% 86,355 87,891 Sep 2028 Total $ 246,550 $ 249,891
Schedule Of Senior Medium-Term Notes	(In thousands) Senior notes Coupon rate Balance Par amount Maturity 4.50% 152,411 163,857 March 2017 4.50% 135,149 145,231 June 2023 Total $ 287,560 $ 309,088
Debt Redemptions and Repurchases	(In thousands) 2016 2015 Note type Par amount Par amount Trust preferred: 3mL+2.85% $ 3,093 3mL+2.85% (3.38%) $ 51,547 3mL+1.90% (2.22%) 36,083 3mL+1.78% (2.29%) 61,856 3mL+3.15% (3.75%) 7,732 3mL+2.89% (3.42%) 7,732 164,950 3,093 Convertible subordinated notes: 6.00% 79,276 5.50% 71,592 — 150,868 Subordinated notes: 6.00% 32,366 5.50% 52,078 — 84,444 Senior notes: 3.30% - 3.70% 27,281 3.60% 11,108 4.00% 89,360 100,468 27,281 Federal Home Loan Bank Advances 22,009 Total $ 265,418 $ 287,695
Schedule Of Maturities On Long-Term Debt	(Amounts in thousands) 2016 Note type Coupon rate Min Coupon rate Max Senior notes 4.50 % 4.50 %

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2016
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 2016 2015 Authorized Outstanding Rate (when applicable) Series A $ 66,316 $ 66,316 140,000 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 138,391 171,827 200,000 138,391 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 98,555 125,224 300,893 98,555 5.8% Semi-annually Jun,Dec Jun 15, 2023 annual float-ing rate = 3mL+3.8% Qtrly Mar,Jun,Sep,Dec Series J 136,368 195,152 195,152 136,368 7.2% Semi-annually Mar,Sep Sep 15, 2023 annual float-ing rate = 3mL+4.44% Qtrly Mar,Jun,Sep,Dec Total $ 709,601 $ 828,490
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 2016 2015 2014 Affected line item Net realized gains (losses) on investment securities $ 102 $ (138,735 ) $ 10,419 SI Fixed income securities gains (losses), net Income tax expense (benefit) 39 (52,712 ) 3,971 63 (86,023 ) 6,448 Net unrealized losses on investment securities — — (27 ) SI Net impairment losses on investment securities Income tax benefit — — (10 ) — — (17 ) Accretion of securities with noncredit-related impairment losses not expected to be sold — — (1,878 ) BS Investment securities, held-to-maturity Deferred income taxes — — 767 BS Other assets $ 63 $ (86,023 ) $ 5,320 Net unrealized gains on derivative instruments $ 11,290 $ 9,004 $ 2,594 SI Interest and fees on loans Income tax expense 4,290 3,421 989 $ 7,000 $ 5,583 $ 1,605 Amortization of net actuarial loss $ (8,436 ) $ (5,996 ) $ (2,843 ) SI Salaries and employee benefits Amortization of prior service cost — — (50 ) SI Salaries and employee benefits Income tax benefit (3,206 ) (2,278 ) (1,103 ) $ (5,230 ) $ (3,718 ) $ (1,790 ) 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 2016 Balance at December 31, 2015 $ (18,369 ) $ 1,546 $ (37,789 ) $ (54,612 ) Other comprehensive income (loss) before reclassifications, net of tax (73,985 ) 7,093 1,756 (65,136 ) Amounts reclassified from AOCI, net of tax (63 ) (7,000 ) 5,230 (1,833 ) Other comprehensive income (loss) (74,048 ) 93 6,986 (66,969 ) Balance at December 31, 2016 $ (92,417 ) $ 1,639 $ (30,803 ) $ (121,581 ) Income tax expense (benefit) included in other comprehensive income (loss) $ (44,898 ) $ (76 ) $ 5,356 $ (39,618 ) 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
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 applicable 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 2016 2015 Authorized Outstanding Rate (when applicable) Series A $ 66,316 $ 66,316 140,000 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 138,391 171,827 200,000 138,391 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 98,555 125,224 300,893 98,555 5.8% Semi-annually Jun,Dec Jun 15, 2023 annual float-ing rate = 3mL+3.8% Qtrly Mar,Jun,Sep,Dec Series J 136,368 195,152 195,152 136,368 7.2% Semi-annually Mar,Sep Sep 15, 2023 annual float-ing rate = 3mL+4.44% Qtrly Mar,Jun,Sep,Dec Total $ 709,601 $ 828,490 Preferred Stock Redemptions During 2016 , we launched a cash tender offer to purchase up to $120 million par amount of certain outstanding preferred stock. Our preferred stock decreased by $119 million as a result of the tender offer, including the purchase of $27 million of our Series I preferred stock, $59 million of our Series J preferred stock, and $33 million of our Series G preferred stock for an aggregate cash payment of $126 million . The total one-time reduction to net earnings applicable to common shareholders associated with the preferred stock redemption was $9.8 million . We also launched a $180 million cash tender offer during 2015 , which resulted in a Series I preferred stock redemption of approximately $176 million . The size and terms of the offers in 2016 and 2015 were determined in accordance with the Company’s 2015 capital plan. Our 2016 capital plan (which spans the timeframe of July 2016 to June 2017) allows for the redemption of up to $144 million of preferred equity. Common Stock The Company commenced its common stock buyback program during 2016 and repurchased 2.89 million shares of common shares outstanding with a fair value of $90 million at an average price of $31.15 per share. During the first quarter of 2017, the Company repurchased an additional $45 million of common stock at an average price of $42.43 per share, leaving $45 million of buyback capacity remaining in the 2016 capital plan. Common Stock Warrants As of December 31, 2016, we have 5.8 million common stock warrants at an exercise price of $36.27 per share which expire on November 14, 2018 . These warrants were associated with the preferred stock issued under the Troubled Asset Relief Program which was redeemed in 2012. In addition, we have 29.3 million common stock warrants at an exercise price of $35.82 , as of December 31, 2016, which expire on 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 2016 Balance at December 31, 2015 $ (18,369 ) $ 1,546 $ (37,789 ) $ (54,612 ) Other comprehensive income (loss) before reclassifications, net of tax (73,985 ) 7,093 1,756 (65,136 ) Amounts reclassified from AOCI, net of tax (63 ) (7,000 ) 5,230 (1,833 ) Other comprehensive income (loss) (74,048 ) 93 6,986 (66,969 ) Balance at December 31, 2016 $ (92,417 ) $ 1,639 $ (30,803 ) $ (121,581 ) Income tax expense (benefit) included in other comprehensive income (loss) $ (44,898 ) $ (76 ) $ 5,356 $ (39,618 ) 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 Statement of Income (SI) Balance Sheet (BS) (In thousands) Amounts reclassified from AOCI 1 Details about AOCI components 2016 2015 2014 Affected line item Net realized gains (losses) on investment securities $ 102 $ (138,735 ) $ 10,419 SI Fixed income securities gains (losses), net Income tax expense (benefit) 39 (52,712 ) 3,971 63 (86,023 ) 6,448 Net unrealized losses on investment securities — — (27 ) SI Net impairment losses on investment securities Income tax benefit — — (10 ) — — (17 ) Accretion of securities with noncredit-related impairment losses not expected to be sold — — (1,878 ) BS Investment securities, held-to-maturity Deferred income taxes — — 767 BS Other assets $ 63 $ (86,023 ) $ 5,320 Net unrealized gains on derivative instruments $ 11,290 $ 9,004 $ 2,594 SI Interest and fees on loans Income tax expense 4,290 3,421 989 $ 7,000 $ 5,583 $ 1,605 Amortization of net actuarial loss $ (8,436 ) $ (5,996 ) $ (2,843 ) SI Salaries and employee benefits Amortization of prior service cost — — (50 ) SI Salaries and employee benefits Income tax benefit (3,206 ) (2,278 ) (1,103 ) $ (5,230 ) $ (3,718 ) $ (1,790 ) 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, 2016 and 2015 , the cost of the common stock included in retained earnings was approximately $14.1 million and $15.2 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, 2016 and 2015 , total invested assets were approximately $91.0 million and $81.8 million and total obligations were approximately $105.2 million and $96.9 million , respectively.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Schedule Of Income Taxes (Benefit)	(In thousands) 2016 2015 2014 Federal: Current $ 217,400 $ 158,164 $ 178,450 Deferred (4,108 ) (31,843 ) 14,277 213,292 126,321 192,727 State: Current 26,900 14,027 18,573 Deferred (4,334 ) 2,040 11,661 22,566 16,067 30,234 $ 235,858 $ 142,388 $ 222,961
Schedule Of Statutory Federal Income Tax Rate Reconciles To Actual Income Tax Expense (Benefit)	(In thousands) 2016 2015 2014 Income tax expense at statutory federal rate $ 246,718 $ 158,151 $ 217,498 State income taxes including credits, net 14,668 10,443 19,652 Other nondeductible expenses 3,149 3,205 2,949 Nontaxable income (24,688 ) (20,397 ) (17,869 ) Tax credits and other taxes (1,704 ) (2,926 ) (1,717 ) Other (2,285 ) (6,088 ) 2,448 $ 235,858 $ 142,388 $ 222,961
Schedule Of Tax Effects Of Deferred Tax Assets And Deferred Tax Liabilities	(In thousands) December 31, 2016 2015 Gross deferred tax assets: Book loan loss deduction in excess of tax $ 240,881 $ 254,223 Pension and postretirement 19,332 24,749 Deferred compensation 87,420 91,665 Security investments and derivative fair value adjustments 56,628 11,254 Net operating losses, capital losses and tax credits 4,664 4,659 FDIC-supported transactions 5,086 9,157 Other 46,052 46,016 460,063 441,723 Valuation allowance (4,127 ) (4,261 ) Total deferred tax assets 455,936 437,462 Gross deferred tax liabilities: Core deposits and purchase accounting (1,140 ) (3,392 ) Premises and equipment, due to differences in depreciation (7,548 ) (10,588 ) Federal Home Loan Bank stock dividends (3,800 ) (10,042 ) Leasing operations (75,109 ) (85,255 ) Prepaid expenses (6,534 ) (9,001 ) Prepaid pension reserves (17,659 ) (18,087 ) Mortgage servicing (9,844 ) (6,845 ) Subordinated debt modification (30,762 ) (46,451 ) Deferred loan fees (25,425 ) (23,723 ) Equity investments (27,651 ) (21,037 ) Total deferred tax liabilities (205,472 ) (234,421 ) Net deferred tax assets $ 250,464 $ 203,041
Schedule Of Reconciliation Of Gross Unrecognized Tax Benefits	(In thousands) 2016 2015 2014 Balance at beginning of year $ 5,448 $ 3,255 $ 2,385 Tax positions related to current year: Additions 1,554 786 — Reductions — — — Tax positions related to prior years: Additions 542 1,407 870 Reductions — — — Settlements with taxing authorities — — — Lapses in statutes of limitations (3,255 ) — — Balance at end of year $ 4,289 $ 5,448 $ 3,255

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2016
Share-based Compensation [Abstract]
Compensation Expense And Related Tax Benefit For All Share-Based Awards	(In thousands) 2016 2015 2014 Compensation expense $ 26,144 $ 24,974 $ 23,632 Reduction of income tax expense 8,762 8,284 7,767
Summary Of Stock Option Activity	Number of shares Weighted average exercise price 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 Granted 789,651 21.25 Exercised (1,055,532 ) 23.75 Expired (56,297 ) 61.60 Forfeited (44,007 ) 27.66 Balance at December 31, 2016 3,437,910 26.44 Outstanding stock options exercisable as of: December 31, 2016 1,892,136 $ 27.60 December 31, 2015 2,187,259 26.35 December 31, 2014 3,804,873 33.86

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, 2016USD ($)
Operating Leased Assets [Line Items]
Summary of Unfunded Commitments and Redemption [Table Text Block]	December 31, (In thousands) 2016 2015 Net unfunded commitments to extend credit 1 $ 18,273,714 $ 17,169,785 Standby letters of credit: Financial 771,269 661,554 Performance 195,451 216,843 Commercial letters of credit 60,320 18,447 Total unfunded lending commitments $ 19,300,754 $ 18,066,629
Operating Leases, Future Minimum Payments Due	$ 274,596
Operating Leases, Future Minimum Payments Due, Next Twelve Months	44,797
Operating Leases, Future Minimum Payments, Due in Two Years	42,963
Operating Leases, Future Minimum Payments, Due in Three Years	36,074
Operating Leases, Future Minimum Payments, Due in Four Years	31,043
Operating Leases, Future Minimum Payments, Due in Five Years	25,670
Operating Leases, Future Minimum Payments, Due Thereafter	$ 94,049

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2016
Regulatory Capital Requirements [Abstract]
Summary Of Actual Capital Amounts And Ratios For The Company And Its Three Largest Subsidiary Banks	December 31, 2016 To be well-capitalized (In thousands) Amount Ratio Amount Ratio Transitional Basis Basel III Regulatory Capital Rules Total capital (to risk-weighted assets) The Company $ 7,608,502 15.24 % $ 4,993,671 10.00 % ZB, National Association 7,277,987 14.61 4,983,000 10.00 Tier 1 capital (to risk-weighted assets) The Company 6,737,638 13.49 3,994,937 8.00 ZB, National Association 6,654,990 13.36 3,986,400 8.00 Common equity tier 1 capital (Basel III) The Company 6,028,037 12.07 3,245,886 6.50 ZB, National Association 5,824,090 11.69 3,238,950 6.50 Tier 1 capital (to average assets) The Company 6,737,638 11.09 na na 1 ZB, National Association 6,654,990 10.99 3,027,427 5.00 December 31, 2015 To be well-capitalized (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 .

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
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]	2016 2015 Profit sharing expense $6,265 $6,062 Level 3 - significant input assumptions: 2016 2015 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) $ (4,866 ) $ (123 ) $ 52
Schedule Of Weighted Average Assumptions Based On The Pension Plan	2016 2015 2014 Used to determine benefit obligation at year-end: Discount rate 4.10 % 4.20 % 3.95 % Used to determine net periodic benefit cost for the years ended December 31: Discount rate 4.20 3.95 4.60 Expected long-term return on plan assets 7.50 7.50 8.00

Retirement Plans Weighted avera

Retirement Plans Weighted average assumptions on pension plan (Tables)	12 Months Ended
	Dec. 31, 2016
Weighted average assumptions on pension plan [Abstract]
Schedule Of Weighted Average Assumptions Based On The Pension Plan	2016 2015 2014 Used to determine benefit obligation at year-end: Discount rate 4.10 % 4.20 % 3.95 % Used to determine net periodic benefit cost for the years ended December 31: Discount rate 4.20 3.95 4.60 Expected long-term return on plan assets 7.50 7.50 8.00

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis	(In thousands) December 31, 2016 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: U.S. Treasury, agencies and corporations $ — $ 12,009,676 $ — $ 12,009,676 Municipal securities 1,154,210 1,154,210 Other debt securities 23,892 23,892 Money market mutual funds and other 183,699 717 184,416 183,699 13,188,495 — 13,372,194 Trading account 114,803 114,803 Other noninterest-bearing investments: Bank-owned life insurance 497,466 497,466 Private equity investments 128,654 128,654 Other assets: Agriculture loan servicing and interest-only strips 20,248 20,248 Deferred compensation plan assets 91,040 91,040 Derivatives: Interest rate related and other 4,165 4,165 Interest rate swaps for customers 48,754 48,754 Foreign currency exchange contracts 11,276 11,276 11,276 52,919 — 64,195 $ 286,015 $ 13,853,683 $ 148,902 $ 14,288,600 LIABILITIES Securities sold, not yet purchased $ 25,321 $ — $ — $ 25,321 Other liabilities: Deferred compensation plan obligations 91,040 91,040 Derivatives: Interest rate related and other 1,499 1,499 Interest rate swaps for customers 49,050 49,050 Foreign currency exchange contracts 8,672 8,672 8,672 50,549 — 59,221 $ 125,033 $ 50,549 $ — $ 175,582 (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 $ 132,489 $ 54,678 $ — $ 187,167
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, 2016 (In thousands) Municipal Trust Other Private Ag loan svcg and int-only strips Derivatives Balance at December 31, 2015 $ — $ — $ — $ 120,027 $ 13,514 $ — Total net gains (losses) included in: Statement of income: Dividends and other investment loss (1,340 ) Equity securities gains, net 5,325 Other noninterest income 7,549 Purchases 19,174 368 Sales (3,673 ) Redemptions and paydowns (10,859 ) (1,183 ) Balance at December 31, 2016 $ — $ — $ — $ 128,654 $ 20,248 $ — 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 $ — 1 Real Estate Investment Trust
Schedule Of Realized Gains (Losses) Using Level 3 Inputs	(In thousands) Year Ended December 31, 2016 2015 Dividends and other investment loss $ — $ (2 ) Equity securities gains (losses), net 5,727 (11,311 ) Fixed income securities losses, net — (137,641 )
Schedule Of Assets With Fair Value Changes On Nonrecurring Basis	(In thousands) Fair value at December 31, 2016 Gains (losses) from Level 1 Level 2 Level 3 Total ASSETS Private equity investments, carried at cost $ — $ — $ 1,297 $ 1,297 $ (522 ) Impaired loans — 51,842 — 51,842 (36,276 ) Other real estate owned — 871 — 871 (1,871 ) $ — $ 52,713 $ 1,297 $ 54,010 $ (38,669 ) (In thousands) Fair value at December 31, 2015 Gains (losses) from 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 )
Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments	December 31, 2016 (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 $ 568,334 $ — $ 568,334 $ — $ — $ 568,334 Derivatives (included in other assets) 64,195 — 64,195 (17,118 ) (162 ) 46,915 $ 632,529 $ — $ 632,529 $ (17,118 ) $ (162 ) $ 615,249 Liabilities: Federal funds and other short-term borrowings $ 827,269 $ — $ 827,269 $ — $ — $ 827,269 Derivatives (included in other liabilities) 59,221 — 59,221 (17,118 ) (16,570 ) 25,533 $ 886,490 $ — $ 886,490 $ (17,118 ) $ (16,570 ) $ 852,802 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 (6,990 ) 70,648 $ 697,396 $ — $ 697,396 $ (6,990 ) $ — $ 690,406 Liabilities: Federal funds and other short-term borrowings $ 346,987 $ — $ 346,987 $ — $ — $ 346,987 Derivatives (included in other liabilities) 72,568 — 72,568 (6,990 ) (60,923 ) 4,655 $ 419,555 $ — $ 419,555 $ (6,990 ) $ (60,923 ) $ 351,642 December 31, 2016 December 31, 2015 (In thousands) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 867,904 $ 850,473 2 $ 545,648 $ 552,088 2 Loans and leases (including loans held for sale), net of allowance 42,253,677 42,110,544 3 40,193,374 39,535,365 3 Financial liabilities: Time deposits 2,756,810 2,743,885 2 2,130,680 2,129,742 2 Foreign deposits — — 2 294,391 294,321 2 Other short-term borrowings 500,000 500,000 2 — — 2 Long-term debt (less fair value hedges) 534,850 551,881 2 812,366 838,796 2

Operating Segment Information O

Operating Segment Information Operating Segment Information (Tables)	12 Months Ended
	Dec. 31, 2016
Operating Segment Information [Abstract]
Schedule of Segment Reporting Information, by Segment	(In millions) Zions Bank Amegy CB&T 2016 2015 2014 2016 2015 2014 2016 2015 2014 SELECTED INCOME STATEMENT DATA Net interest income $ 633.1 $ 614.9 $ 628.8 $ 479.5 $ 475.4 $ 466.4 $ 450.0 $ 425.6 $ 444.1 Provision for loan losses (21.6 ) (28.3 ) (58.5 ) 163.0 91.3 32.2 (9.1 ) (4.4 ) (20.1 ) Net interest income after provision for loan losses 654.7 643.2 687.3 316.5 384.1 434.2 459.1 430.0 464.2 Noninterest income 148.6 132.7 143.0 122.5 120.6 127.5 67.2 63.4 60.6 Noninterest expense 392.5 430.7 439.9 317.1 372.7 357.3 268.2 294.2 321.3 Income (loss) before income taxes $ 410.8 $ 345.2 $ 390.4 $ 121.9 $ 132.0 $ 204.4 $ 258.1 $ 199.2 $ 203.5 SELECTED BALANCE SHEET DATA Total loans $ 12,560 $ 12,232 $ 12,172 $ 10,557 $ 10,115 $ 10,077 $ 9,381 $ 8,832 $ 8,530 Total deposits 16,764 16,233 16,214 11,924 11,677 11,491 10,969 10,520 9,707 (In millions) NBAZ NSB Vectra 2016 2015 2014 2016 2015 2014 2016 2015 2014 SELECTED INCOME STATEMENT DATA Net interest income $ 196.7 $ 181.8 $ 181.1 $ 124.8 $ 125.3 $ 125.4 $ 123.1 $ 117.2 $ 114.0 Provision for loan losses (3.1 ) 7.9 (21.5 ) (28.4 ) (28.3 ) (20.9 ) (7.9 ) 4.7 (8.4 ) Net interest income after provision for loan losses 199.8 173.9 202.6 153.2 153.6 146.3 131.0 112.5 122.4 Noninterest income 39.7 36.1 33.5 39.4 36.3 34.9 22.8 21.3 22.3 Noninterest expense 129.9 132.7 145.1 123.5 131.3 132.7 87.3 97.6 98.3 Income (loss) before income taxes $ 109.6 $ 77.3 $ 91.0 $ 69.1 $ 58.6 $ 48.5 $ 66.5 $ 36.2 $ 46.4 SELECTED BALANCE SHEET DATA Total loans $ 4,292 $ 3,909 $ 3,750 $ 2,344 $ 2,285 $ 2,421 $ 2,528 $ 2,468 $ 2,320 Total deposits 4,609 4,369 4,133 4,243 4,035 3,690 2,842 2,889 2,591 (In millions) TCBW Other Consolidated Company 2016 2015 2014 2016 2015 2014 2016 2015 2014 SELECTED INCOME STATEMENT DATA Net interest income $ 39.5 $ 34.6 $ 34.6 $ (179.3 ) $ (259.5 ) $ (314.4 ) $ 1,867.4 $ 1,715.3 $ 1,680.0 Provision for loan losses (0.2 ) (2.9 ) (0.9 ) 0.1 — — 92.8 40.0 (98.1 ) Net interest income after provision for loan losses 39.7 37.5 35.5 (179.4 ) (259.5 ) (314.4 ) 1,774.6 1,675.3 1,778.1 Noninterest income 4.6 4.1 4.1 70.8 (57.3 ) 66.8 515.6 357.2 492.7 Noninterest expense 18.6 16.5 33.4 248.2 104.9 121.4 1,585.3 1,580.6 1,649.4 Income (loss) before income taxes $ 25.7 $ 25.1 $ 6.2 $ (356.8 ) $ (421.7 ) $ (369.0 ) $ 704.9 $ 451.9 $ 621.4 SELECTED BALANCE SHEET DATA Total loans $ 870 $ 704 $ 713 $ 117 $ 105 $ 81 $ 42,649 $ 40,650 $ 40,064 Total deposits 1,161 986 816 724 (335 ) (794 ) 53,236 50,374 47,848

Parent Company Financial Info51

Parent Company Financial Information (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	(In thousands) December 31, 2016 2015 ASSETS Cash and due from banks $ 2,023 $ 18,375 Interest-bearing deposits 528,531 775,649 Security resell agreements — 100,000 Investment securities: Available-for-sale, at fair value 40,258 45,168 Other noninterest-bearing investments 28,719 28,178 Investments in subsidiaries: Commercial bank 7,570,521 7,312,654 Other subsidiaries 6,126 84,010 Receivables from subsidiaries: Other subsidiaries — 60 Other assets 80,715 78,728 $ 8,256,893 $ 8,442,822 LIABILITIES AND SHAREHOLDERS’ EQUITY Other liabilities $ 88,477 $ 123,849 Subordinated debt to affiliated trusts — 164,950 Long-term debt: Due to others 534,110 646,504 Total liabilities 622,587 935,303 Shareholders’ equity: Preferred stock 709,601 828,490 Common stock 4,724,715 4,766,731 Retained earnings 2,321,571 1,966,910 Accumulated other comprehensive loss (121,581 ) (54,612 ) Total shareholders’ equity 7,634,306 7,507,519 $ 8,256,893 $ 8,442,822
Condensed Statements Of Income	(In thousands) Year Ended December 31, 2016 2015 2014 Interest income: Commercial bank $ 559 $ 1,162 $ 1,489 Other subsidiaries 3 3 16 Other loans and securities 2,015 3,014 10,900 Total interest income 2,577 4,179 12,405 Interest expense: Affiliated trusts 3,484 4,308 4,265 Other borrowed funds 33,651 63,665 117,700 Total interest expense 37,135 67,973 121,965 Net interest loss (34,558 ) (63,794 ) (109,560 ) Other income: Dividends from consolidated subsidiaries: Commercial bank 263,149 233,853 236,012 Other subsidiaries — 100 400 Equity and fixed income securities gains, net — 37,161 300,275 Other income 4,490 12,512 6,475 267,639 283,626 543,162 Expenses: Salaries and employee benefits 22,868 24,674 17,457 Debt extinguishment cost 353 135 44,422 Other operating expenses (13,543 ) 10,473 10,559 9,678 35,282 72,438 Income before income taxes and undistributed income of consolidated subsidiaries 223,403 184,550 361,164 Income tax expense (benefit) (19,006 ) (27,140 ) 55,865 Income before equity in undistributed income of consolidated subsidiaries 242,409 211,690 305,299 Equity in undistributed income (loss) of consolidated subsidiaries: Commercial bank 230,167 108,350 97,673 Other subsidiaries (3,526 ) (10,569 ) (4,510 ) Net income 469,050 309,471 398,462 Preferred stock dividends (47,982 ) (62,857 ) (71,894 ) Preferred stock redemption (9,759 ) — — Net earnings applicable to common shareholders $ 411,309 $ 246,614 $ 326,568
Condensed Statements Of Cash Flows	(In thousands) Year Ended December 31, 2016 2015 2014 CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 469,050 $ 309,471 $ 398,462 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed net income of consolidated subsidiaries (226,641 ) (97,781 ) (93,163 ) Debt extinguishment cost 353 135 44,422 Other, net (31,048 ) 78,580 149,280 Net cash provided by operating activities 211,714 290,405 499,001 CASH FLOWS FROM INVESTING ACTIVITIES Net decrease (increase) in money market investments 347,118 132,267 (1,007,844 ) Collection of advances to subsidiaries 60 56,000 15,000 Advances to subsidiaries — (41,000 ) (30,060 ) Proceeds from sales and maturities of investment securities 3,878 124,419 372,357 Purchases of investment securities — (46,851 ) — Decrease of investment in subsidiaries — 15,000 6,310 Other, net 7,342 4,010 24,319 Net cash provided by (used in) investing activities 358,398 243,845 (619,918 ) CASH FLOWS FROM FINANCING ACTIVITIES Repayments of long-term debt (279,948 ) (271,120 ) (1,147,641 ) Debt extinguishment cost paid (353 ) (135 ) (35,435 ) Proceeds from issuance of common stock 25,072 22,392 526,438 Cash paid for preferred stock redemptions (126,144 ) (175,669 ) — Common stock redeemed and retired (97,240 ) (6,681 ) (5,589 ) Dividends paid on preferred stock (50,098 ) (62,857 ) (64,868 ) Dividends paid on common stock (57,753 ) (45,198 ) (31,262 ) Other, net — (381 ) (30 ) Net cash used in financing activities (586,464 ) (539,649 ) (758,387 ) Net decrease in cash and due from banks (16,352 ) (5,399 ) (879,304 ) Cash and due from banks at beginning of year 18,375 23,774 903,078 Cash and due from banks at end of year $ 2,023 $ 18,375 $ 23,774

Summary Of Significant Accoun52

Summary Of Significant Accounting Policies (Details) $ in Millions	Dec. 31, 2016USD ($)Banks	Dec. 31, 2016USD ($)Banks
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of States in which Entity Operates | Banks	11	11
Security resell agreements maturity days	30
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value	$ 347	$ 347
Security resell agreements maximum amount, outstanding	$ 2,200	$ 2,200
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
Number of variable interest entities consolidated	0	0
Security resell agreements average amount		$ 464
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, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Recognized gain on sale of stock	$ 7,168	$ 11,875	$ 13,471

Supplemental Cash Flow Inform54

Supplemental Cash Flow Information (Schedule Of Noncash Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Cash Flow Reclassification of Certain Items		$ 70,800	$ 74,000
Real Estate Owned, Transfer to Real Estate Owned	$ 14,632	11,924	25,189
Transfer of Portfolio Loans and Leases to Held-for-sale	(50,353)	(5,048)	(26,272)
Amortized Cost of Securities Reclassified from HTM to AFS	0	79,276	0
Available for sale securities purchased, not settled	$ 395,079	$ 0	$ 0

Offsetting Assets and Liabili55

Offsetting Assets and Liabilities Cash and Money Market Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets [Member] | Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts recognized	$ 568,334	$ 619,758
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	568,334	619,758
Gross amounts not offset in the balance sheet	0	0
Cash Collateral Received/Pledged	0	0
Net amount	568,334	619,758
Assets [Member] | Derivative Financial Instruments, Assets [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts recognized	64,195	77,638
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	64,195	77,638
Gross amounts not offset in the balance sheet	(17,118)	(6,990)
Cash Collateral Received/Pledged	(162)
Net amount	46,915	70,648
Assets [Member] | Assets, Total [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts recognized	632,529	697,396
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	632,529	697,396
Gross amounts not offset in the balance sheet	(17,118)	(6,990)
Cash Collateral Received/Pledged	(162)	0
Net amount	615,249	690,406
Other Liabilities [Member] | Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts recognized	827,269	346,987
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	827,269	346,987
Gross amounts not offset in the balance sheet	0	0
Cash Collateral Received/Pledged	0	0
Net amount	827,269	346,987
Other Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts recognized	59,221	72,568
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	59,221	72,568
Gross amounts not offset in the balance sheet	(17,118)	(6,990)
Cash Collateral Received/Pledged	(16,570)	(60,923)
Net amount	25,533	4,655
Other Liabilities [Member] | Liabilities, Total [Member]
Gain (Loss) on Investments [Line Items]
Gross amounts recognized	886,490	419,555
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	886,490	419,555
Gross amounts not offset in the balance sheet	(17,118)	(6,990)
Cash Collateral Received/Pledged	(16,570)	(60,923)
Net amount	$ 852,802	$ 351,642

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Thousands	6 Months Ended	12 Months Ended			24 Months Ended
	Jun. 30, 2015USD ($)	Dec. 31, 2016USD ($)Securities	Dec. 31, 2015USD ($)Securities	Dec. 31, 2014USD ($)	Dec. 31, 2016USD ($)Securities
Investment [Line Items]
Interest on securities		$ 203,920	$ 124,086	$ 101,936
Amortized cost of CDO securities sold			$ 574,000
Number of HTM investment securities in an unrealized loss position | Securities		642	187		642
Number of AFS investment securities in an unrealized loss position | Securities		2,398	709		2,398
Amortized Cost of Securities Reclassified from HTM to AFS		$ 0	$ 79,276	$ 0
Carrying value of pledged securities		1,400,000	2,300,000		$ 1,400,000
Available-for-sale Securities, Amortized Cost Basis		13,520,716	7,672,590		13,520,716
Private equity investments prohibited by Volker rule		6,000			6,000
Private Equity Investments		139,000			139,000
Private Equity Investments Sold Prohibited by Volcker Rule		10,000	9,000		19,000
Commitments for private equity and onther noninterest bearing investments		26,000			26,000
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		$ 4,000			$ 4,000
Available-for-sale Securities [Member]
Investment [Line Items]
Amortized Cost of Securities Reclassified from HTM to AFS			$ 79,000

Investment Securities (Summary

Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Held-to-maturity, fair value	$ 850,473	$ 552,088
Held-to-maturity, Amortized cost	867,904
Available-for-sale debt securities, Amortized cost	13,336,309
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	18,445
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	166,976
Available-for-sale debt securities, Estimated fair value	13,187,778	7,542,480
Available-for-sale equity securities, Gross unrealized gains, Recognized in OCI		27,163
Available-for-sale equity securities, Gross unrealized losses, Recognized in OCI		56,661
Available-for-sale, at fair value	13,372,194	7,643,116
Available-for-sale Equity Securities, Amortized Cost Basis		7,571,978
Available-for-sale Securities, Amortized Cost Basis	13,520,716	7,672,590
Available-for-sale, Gross unrealized gains, Recognized in OCI	18,454	27,224
Available-for-sale, Gross unrealized losses, Recognized in OCI	166,976	56,698
amortized cost of investment securities	14,388,620	8,218,238
Gross Unrealized Gains of Investment Securities Recognized in OCI	24,429	38,442
Gross Unrealized Losses of Investment Securities Recognized in OCI	190,382	61,476
Estimated Fair Value of Investment Securities	14,222,667	8,195,204
Held-to-maturity Securities	867,904	545,648
Municipal Securities [Member]
Investment [Line Items]
Held-to-maturity, fair value	850,473	552,088
Held To Maturity Securities Gross Unrealized Losses	23,406	4,778
Held-to-maturity, Amortized cost	867,904	545,648
Held To Maturity Securities Gross Unrealized Gains	5,975	11,218
Available-for-sale debt securities, Amortized cost	1,181,560	417,374
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	969	2,177
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	28,319	856
Available-for-sale debt securities, Estimated fair value	1,154,210	418,695
Available-for-sale, Other debt securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost	25,359
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	103
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	1,570
Available-for-sale debt securities, Estimated fair value	23,892
Other [Member] | Asset-Backed Securities [Member]
Investment [Line Items]
Available-for-sale equity securities, Gross unrealized gains, Recognized in OCI		152
Available-for-sale equity securities, Gross unrealized losses, Recognized in OCI		2,665
Available-for-sale, at fair value		22,941
Available-for-sale Equity Securities, Amortized Cost Basis		25,454
Agency Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost	1,845,825	1,231,740
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	2,338	4,313
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	9,188	2,658
Available-for-sale debt securities, Estimated fair value	1,838,975	1,233,395
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost	7,985,630	3,964,593
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	6,596	7,919
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	109,392	36,037
Available-for-sale debt securities, Estimated fair value	7,882,834	3,936,475
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost	2,297,935	1,932,817
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI	8,439	12,602
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI	18,507	14,445
Available-for-sale debt securities, Estimated fair value	2,287,867	1,930,974
Mutual Funds And Other [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		61
Available-for-sale, Gross unrealized losses, Recognized in OCI		$ 37
Mutual Funds And Stock [Member]
Investment [Line Items]
Available-for-sale, at fair value	184,416
Available-for-sale Securities, Amortized Cost Basis	184,407
Available-for-sale, Gross unrealized gains, Recognized in OCI	9
Available-for-sale, Gross unrealized losses, Recognized in OCI	$ 0

Investment Securities (Contract

Investment Securities (Contractual Maturities Debt Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments [Abstract]
Held-to-maturity, Due in one year or less, Amortized cost	$ 181,416
Held-to-maturity, Due in one year or less, Estimated fair value	181,686
Held-to-maturity, Due after one year through five years, Estimated fair value	276,470
Held-to-maturity, Due after five years through ten years, Estimated fair value	195,541
Held-to-maturity, Due after ten years, Amortized cost	211,068
Held-to-maturity, Due after ten years, Estimated fair value	196,776
Held-to-maturity, Amortized cost	867,904
Held-to-maturity, fair value	850,473	$ 552,088
Available-for-sale, Due in one year or less, Amortized cost	1,548,685
Available-for-sale, Due in one year or less, Estimated fair value	1,532,345
Held To Maturity Securities Debt Maturities One Year Through Five Years, Amortized Cost	276,753
Available-for-sale, Due after one year through five years, Amortized cost	4,971,404
Available-for-sale, Due after one year through five years, Estimated fair value	4,920,537
Held To Maturity Securities Debt Maturities Five Years Through Ten Years, Amortized Cost	198,667
Available-for-sale, Due after five years through ten years, Amortized cost	4,305,373
Available-for-sale, Due after five years through ten years, Estimated fair value	4,251,664
Available-for-sale, Due after ten years, Amortized cost	2,510,847
Available-for-sale, Due after ten years, Estimated fair value	2,483,232
Available-for-sale, Amortized cost	13,336,309
Available-for-sale, Estimated fair value	$ 13,187,778	$ 7,542,480

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, 2016	Dec. 31, 2015
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	$ 141,773	$ 42,879
Available-for-sale, Less than 12 months - Estimated fair value	9,118,299	4,904,774
Available-for-sale, 12 months or more - Gross unrealized losses	25,203	13,819
Available-for-sale, 12 months or more - Estimated fair value	1,316,737	750,132
Available-for-sale, Total - Gross unrealized losses	166,976	56,698
Available-for-sale, Total - Estimated fair value	10,435,036	5,654,906
Investment Securities Gross Unrealized Losses Less Than 12 Months	157,527	47,400
Investment Securities Estimated Fair Value Less Than 12 Months	9,585,355	5,026,971
Investment Securities Gross Unrealized Losses 12 Months or More	32,855	14,076
Investment Securities Estimated Fair Value 12 Months or More	1,378,126	763,944
Investment Securities Gross Unrealized Losses Total	190,382	61,476
Investment Securities Estimated Fair Value Total	10,963,481	5,790,915
Municipal Securities [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses	15,754	4,521
Held-to-maturity, Less than 12 months - Estimated fair value	467,056	122,197
Held-to-maturity, 12 months or more - Gross unrealized losses	7,652	257
Held-to-maturity, 12 months or more - Estimated fair value	61,389	13,812
Held-to-maturity, Total - Gross unrealized losses	23,406	4,778
Held-to-maturity, Total - Estimated fair value	528,445	136,009
Available-for-sale, Less than 12 months - Gross unrealized losses	28,077	735
Available-for-sale, Less than 12 months - Estimated fair value	991,973	102,901
Available-for-sale, 12 months or more - Gross unrealized losses	242	121
Available-for-sale, 12 months or more - Estimated fair value	9,103	5,733
Available-for-sale, Total - Gross unrealized losses	28,319	856
Available-for-sale, Total - Estimated fair value	1,001,076	108,634
Available-for-sale, Unrealized losses, Other [Member]
Investment [Line Items]
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	1,570	2,665
Available-for-sale, 12 months or more - Estimated fair value	13,433	12,337
Available-for-sale, Total - Gross unrealized losses	1,570	2,665
Available-for-sale, Total - Estimated fair value	13,433	12,337
Agency Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	8,682	2,176
Available-for-sale, Less than 12 months - Estimated fair value	949,608	559,196
Available-for-sale, 12 months or more - Gross unrealized losses	506	482
Available-for-sale, 12 months or more - Estimated fair value	127,249	131,615
Available-for-sale, Total - Gross unrealized losses	9,188	2,658
Available-for-sale, Total - Estimated fair value	1,076,857	690,811
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	102,524	34,583
Available-for-sale, Less than 12 months - Estimated fair value	6,649,246	3,639,824
Available-for-sale, 12 months or more - Gross unrealized losses	6,868	1,454
Available-for-sale, 12 months or more - Estimated fair value	326,417	65,071
Available-for-sale, Total - Gross unrealized losses	109,392	36,037
Available-for-sale, Total - Estimated fair value	6,975,663	3,704,895
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	2,490	5,348
Available-for-sale, Less than 12 months - Estimated fair value	527,472	567,365
Available-for-sale, 12 months or more - Gross unrealized losses	16,017	9,097
Available-for-sale, 12 months or more - Estimated fair value	840,535	535,376
Available-for-sale, Total - Gross unrealized losses	18,507	14,445
Available-for-sale, Total - Estimated fair value	1,368,007	1,102,741
Mutual Funds And Other [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	0	37
Available-for-sale, Less than 12 months - Estimated fair value	0	35,488
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	37
Available-for-sale, Total - Estimated fair value	0	35,488
Available-for-sale Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	141,773	42,842
Available-for-sale, Less than 12 months - Estimated fair value	9,118,299	4,869,286
Available-for-sale, 12 months or more - Gross unrealized losses	25,203	13,819
Available-for-sale, 12 months or more - Estimated fair value	1,316,737	750,132
Available-for-sale, Total - Gross unrealized losses	166,976	56,661
Available-for-sale, Total - Estimated fair value	$ 10,435,036	$ 5,619,418

Investment Securities (Rollforw

Investment Securities (Rollforward Of Total Amount Of Credit-Related OTTI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 0	$ 0	$ 104,551
HTM Securities Transfered to AFS Securities	0	0
Reductions for securities sold during the period	0	104,551
Held-to-maturity Securities [Member]
Investment [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	0	0	9,079
HTM Securities Transfered to AFS Securities	0	9,079
Reductions for securities sold during the period	0	0
Available-for-sale Securities [Member]
Investment [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	0	0	$ 95,472
HTM Securities Transfered to AFS Securities	0	(9,079)
Reductions for securities sold during the period	$ 0	$ 104,551

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, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Equity securities gains (losses)	$ 7,168	$ 11,875	$ 13,471
Noncredit-related losses on securities not expected to be sold (recognized in other comprehensive income)	0	0	0
Investment securities, Held-to-maturity, Gross gains	12	1	18
Investment securities Held-to-maturity, Gross losses	0	0	27
Investment securities, Available-for-sale, Gross gains	120	8,443	92,525
Investment securities, Available-for-sale, Gross losses	30	147,656	83,815
Other noninterest-bearing investments, Nonmarketable equity securities, Gross gains	21,176	25,045	23,706
Other noninterest-bearing investments, Nonmarketable equity securities, Gross losses	14,008	12,693	8,544
Total investment securities and other noninterest-bearing investments, Gross gains	21,308	33,489	116,249
Total investment securities and other noninterest-bearing investments, Gross losses	14,038	160,349	92,386
Net losses	7,270	(126,860)	23,863
Net impairment losses on investment securities	0	0	(27)
Fixed income securities gains (losses), net	$ 102	$ (138,735)	$ 10,419

Investment Securities Investmen

Investment Securities Investment Securities (Tax and Nontaxable Income by Investment Type) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Interest on securities	$ 203,920	$ 124,086	$ 101,936
Trading Securities [Member]
Investment [Line Items]
Interest on securities	3,123	2,214	1,979
Available-for-sale Securities [Member]
Investment [Line Items]
Interest on securities	177,863	98,203	73,923
Held-to-maturity Securities [Member]
Investment [Line Items]
Interest on securities	22,934	23,669	26,034
Taxable [Member]
Investment [Line Items]
Interest on securities	179,710	109,868	88,114
Taxable [Member] | Trading Securities [Member]
Investment [Line Items]
Interest on securities	3,123	2,214	1,979
Taxable [Member] | Available-for-sale Securities [Member]
Investment [Line Items]
Interest on securities	166,281	94,877	71,365
Taxable [Member] | Held-to-maturity Securities [Member]
Investment [Line Items]
Interest on securities	10,306	12,777	14,770
Nontaxable [Member]
Investment [Line Items]
Interest on securities	24,210	14,218	13,822
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	11,582	3,326	2,558
Nontaxable [Member] | Held-to-maturity Securities [Member]
Investment [Line Items]
Interest on securities	$ 12,628	$ 10,892	$ 11,264

Loans And Allowance For Credi63

Loans And Allowance For Credit Losses (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016USD ($)moBilling_CyclesdPayments	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable Commercial Construction and Land Development	$ 289,800,000	$ 288,000,000
Impaired Financing Receivable, Recorded Investment	659,759,000	566,599,000
Loans Pledged as Collateral	24,000,000,000	19,400,000,000
Unearned income and fees, net of related costs	77,000,000	81,000,000
Owner occupied and commercial real estate loans, unamortized premiums	19,900,000	26,200,000
Principle amount of loans held for sale sold	1,400,000,000	1,400,000,000	$ 1,200,000,000
Loans Sold and Serviced	2,000,000,000	2,000,000,000
Additions to Loans Held For Sale	1,400,000,000	1,400,000,000	1,200,000,000
Income from loans sold, excluding servicing	$ 18,100,000	17,800,000	15,100,000
Number of days for consumer loans to be charged off | d	180
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	$ 14,300,000	7,500,000
Recorded investment in TDR loans modified with interest rates below market	127,900,000	188,000,000
Loans modified as troubled debt restructuring loans	72,500,000	134,000,000
Increase (decrease) on gross provision for loan losses	900,000	300,000	(1,700,000)
Total reversal amount to ALLL	2,200,000	3,700,000	4,600,000
Additional interest income due to increased cash flows from acquired loans	18,600,000	31,600,000	$ 46,700,000
Other Real Estate, Foreclosed Assets, Residential Real Estate	1,900,000	500,000
Other Real Estate, In Process of Forecloseing Assets	9,600,000	12,500,000
Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	100,696,000	126,267,000
Commercial Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 494,485,000	335,137,000
Subsequent payment default period, number of days | d	90
Consumer [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 1,140,000	$ 2,606,000
Subsequent payment default period, number of days | d	60

Loans And Allowance For Credi64

Loans And Allowance For Credit Losses (Summary Of Major Portfolio Segment And Specific Loan Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 171,934	$ 149,880
Commercial and industrial	13,451,886	13,211,481
Leasing	422,969	441,666
Owner occupied	6,961,807	7,150,028
Municipal	778,335	675,839
Construction and land development	2,018,655	1,841,502
Term	9,322,138	8,514,401
Loans Receivable, Gross, Commercial, Real Estate	11,340,793	10,355,903
Home equity credit line	2,645,192	2,416,357
1-4 family residential	5,890,714	5,382,099
Construction and other consumer real estate	486,712	385,240
Bankcard and other revolving plans	481,063	443,780
Other	189,794	187,149
Loans and Leases Receivable, Gross	42,649,265	40,649,542
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable before Fees, Gross	21,614,997	21,479,014
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable before Fees, Gross	$ 9,693,475	$ 8,814,625

Loans And Allowance For Credi65

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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				$ 606,048				$ 604,663	$ 606,048	$ 604,663
Provision for loan losses	$ (2,687)	$ 18,825	$ 34,492	42,145	$ 22,701	$ 18,262	$ 566	(1,494)	92,775	40,035	$ (98,082)
Adjustment for FDIC-supported loans									0	5
Gross loan and lease charge-offs									(197,365)	(138,929)
Recoveries									66,064	100,274
Net loan and lease charge-offs									(131,301)	(38,655)
Balance at end of period	567,522				606,048				567,522	606,048	604,663
Balance at beginning of period				74,838				81,076	74,838	81,076
Provision charged (credited) to earnings									(9,927)	(6,238)
Balance at end of period	64,911				74,838				64,911	74,838	81,076
Allowance for loan losses	567,522			606,048	606,048			604,663	606,048	604,663	604,663	$ 567,522	$ 606,048
Reserve for unfunded lending commitments	64,911			74,838	74,838			81,076	74,838	81,076	81,076	64,911	74,838
Total allowance for credit losses												632,433	680,886
Commercial [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				454,277				412,514	454,277	412,514
Provision for loan losses									92,796	96,995
Adjustment for FDIC-supported loans									0	(57)
Gross loan and lease charge-offs									(169,260)	(110,437)
Recoveries									42,907	55,262
Net loan and lease charge-offs									(126,353)	(55,175)
Balance at end of period	420,720				454,277				420,720	454,277	412,514
Balance at beginning of period				57,696				58,931	57,696	58,931
Provision charged (credited) to earnings									(3,464)	(1,235)
Balance at end of period	54,232				57,696				54,232	57,696	58,931
Allowance for loan losses	420,720			454,277	454,277			412,514	454,277	412,514	412,514	420,720	454,277
Reserve for unfunded lending commitments	54,232			57,696	57,696			58,931	57,696	58,931	58,931	54,232	57,696
Total allowance for credit losses												474,952	511,973
Commercial Real Estate [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				113,992				145,009	113,992	145,009
Provision for loan losses									217	(51,777)
Adjustment for FDIC-supported loans									0	57
Gross loan and lease charge-offs									(12,146)	(14,194)
Recoveries									13,864	34,897
Net loan and lease charge-offs									1,718	20,703
Balance at end of period	115,927				113,992				115,927	113,992	145,009
Balance at beginning of period				16,526				21,517	16,526	21,517
Provision charged (credited) to earnings									(5,847)	(4,991)
Balance at end of period	10,679				16,526				10,679	16,526	21,517
Allowance for loan losses	115,927			113,992	113,992			145,009	113,992	145,009	145,009	115,927	113,992
Reserve for unfunded lending commitments	10,679			16,526	16,526			21,517	16,526	21,517	21,517	10,679	16,526
Total allowance for credit losses												126,606	130,518
Consumer [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				37,779				47,140	37,779	47,140
Provision for loan losses									(238)	(5,183)
Adjustment for FDIC-supported loans									0	5
Gross loan and lease charge-offs									(15,959)	(14,298)
Recoveries									9,293	10,115
Net loan and lease charge-offs									(6,666)	(4,183)
Balance at end of period	30,875				37,779				30,875	37,779	47,140
Balance at beginning of period				616				628	616	628
Provision charged (credited) to earnings									(616)	(12)
Balance at end of period	0				616				0	616	628
Allowance for loan losses	30,875			37,779	37,779			47,140	37,779	47,140	47,140	30,875	37,779
Reserve for unfunded lending commitments	$ 0			$ 616	$ 616			$ 628	$ 616	$ 628	$ 628	0	616
Total allowance for credit losses												$ 30,875	$ 38,395

Loans And Allowance For Credi66

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, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	$ (64,566)	$ (49,525)
Allowance for loan losses: Collectively evaluated for impairment	502,388	555,578
Allowance for loan losses: Purchased loans with evidence of credit deterioration	568	945
Allowance for loan losses: Total	567,522	606,048	$ 604,663
Loans and Leases Receivable, Gross	42,649,265	40,649,542
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	(55,951)	(36,909)
Allowance for loan losses: Collectively evaluated for impairment	364,703	417,295
Allowance for loan losses: Purchased loans with evidence of credit deterioration	66	73
Allowance for loan losses: Total	420,720	454,277	412,514
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	(2,620)	(3,154)
Allowance for loan losses: Collectively evaluated for impairment	113,202	110,417
Allowance for loan losses: Purchased loans with evidence of credit deterioration	105	421
Allowance for loan losses: Total	115,927	113,992	145,009
Loans and Leases Receivable, Gross	2,018,655	1,841,502
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	(5,995)	(9,462)
Allowance for loan losses: Collectively evaluated for impairment	24,483	27,866
Allowance for loan losses: Purchased loans with evidence of credit deterioration	397	451
Allowance for loan losses: Total	30,875	37,779	$ 47,140
Loans and Leases Receivable, Gross	189,794	187,149
Outstanding Loan Balances [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Outstanding loan balances: Individually evaluated for impairment	619,440	489,575
Outstanding loan balances: Collectively evaluated for impairment	41,952,653	40,035,044
Loans and Leases Receivable, Gross	42,649,265	40,649,542
Financing Receivable, Acquired Deteriorated Credit Quality	77,172	124,923
Outstanding Loan Balances [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Outstanding loan balances: Individually evaluated for impairment	466,187	289,629
Outstanding loan balances: Collectively evaluated for impairment	21,111,071	21,129,125
Loans and Leases Receivable, Gross	21,614,997	21,479,014
Financing Receivable, Acquired Deteriorated Credit Quality	37,739	60,260
Outstanding Loan Balances [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Outstanding loan balances: Individually evaluated for impairment	78,190	107,341
Outstanding loan balances: Collectively evaluated for impairment	11,230,486	10,193,840
Loans and Leases Receivable, Gross	11,340,793	10,355,903
Financing Receivable, Acquired Deteriorated Credit Quality	32,117	54,722
Outstanding Loan Balances [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Outstanding loan balances: Individually evaluated for impairment	75,063	92,605
Outstanding loan balances: Collectively evaluated for impairment	9,611,096	8,712,079
Loans and Leases Receivable, Gross	9,693,475	8,814,625
Financing Receivable, Acquired Deteriorated Credit Quality	$ 7,316	$ 9,941

Loans And Allowance For Credi67

Loans And Allowance For Credit Losses (Summary Of Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 528,329	$ 349,860
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	40,330	0
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	442,738	242,567
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	36,121	47,298
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	139	186
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	49,470	59,995
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	354,172	163,906
Leasing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	13,920	3,829
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	73,794	73,881
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	852	951
Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	7,109	7,045
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	29,012	40,253
Home Equity Credit Line [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	10,842	8,270
1-4 Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	35,577	50,254
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,677	748
Bankcard And Other Revolving Plans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 1,235	$ 537

Loans And Allowance For Credi68

Loans And Allowance For Credit Losses (Summary Of Past Due Loans (Accruing And Nonaccruing)) (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Receivable Held-for-sale, Net		$ 171,934	$ 149,880
Current		42,339,877	40,363,353
30-89 days past due		150,340	147,980
90+ days past due		159,048	138,209
Total past due		309,388	286,189
Loans and Leases Receivable, Gross		42,649,265	40,649,542
Accruing loans 90+ days past due		35,848	32,024
Nonaccrual loans that are current	[1]	380,781	217,427
Financing Receivable, Recorded Investment, Nonaccrual Status		528,329	349,860
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		40,330	0
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		442,738	242,567
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		21,401,174	21,308,301
30-89 days past due		112,101	106,068
90+ days past due		101,722	64,645
Total past due		213,823	170,713
Loans and Leases Receivable, Gross		21,614,997	21,479,014
Accruing loans 90+ days past due		17,772	6,737
Nonaccrual loans that are current		344,803	166,186
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		2,009,344	1,835,360
30-89 days past due		7,208	842
90+ days past due		2,103	5,300
Total past due		9,311	6,142
Loans and Leases Receivable, Gross		2,018,655	1,841,502
Accruing loans 90+ days past due		368	0
Nonaccrual loans that are current	[1]	310	1,745
Financing Receivable, Recorded Investment, Nonaccrual Status		36,121	47,298
Home Equity Credit Line [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		2,635,321	2,407,972
30-89 days past due		3,868	4,717
90+ days past due		6,003	3,668
Total past due		9,871	8,385
Loans and Leases Receivable, Gross		2,645,192	2,416,357
Accruing loans 90+ days past due		1,500	0
Nonaccrual loans that are current	[1]	4,474	3,053
Financing Receivable, Recorded Investment, Nonaccrual Status		10,842	8,270
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		189,044	186,436
30-89 days past due		711	647
90+ days past due		39	66
Total past due		750	713
Loans and Leases Receivable, Gross		189,794	187,149
Accruing loans 90+ days past due		0	0
Nonaccrual loans that are current	[1]	70	83
Financing Receivable, Recorded Investment, Nonaccrual Status		139	186
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		13,306,132	13,114,045
30-89 days past due		71,446	60,523
90+ days past due		74,308	36,913
Total past due		145,754	97,436
Loans and Leases Receivable, Gross		13,451,886	13,211,481
Accruing loans 90+ days past due		10,321	3,065
Nonaccrual loans that are current	[1]	286,883	117,942
Financing Receivable, Recorded Investment, Nonaccrual Status		354,172	163,906
Leasing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		422,969	440,963
30-89 days past due		0	183
90+ days past due		0	520
Total past due		0	703
Loans and Leases Receivable, Gross		422,969	441,666
Accruing loans 90+ days past due		0	0
Nonaccrual loans that are current	[1]	13,920	3,309
Financing Receivable, Recorded Investment, Nonaccrual Status		13,920	3,829
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		6,893,739	7,085,086
30-89 days past due		40,655	37,776
90+ days past due		27,413	27,166
Total past due		68,068	64,942
Loans and Leases Receivable, Gross		6,961,807	7,150,028
Accruing loans 90+ days past due		7,450	3,626
Nonaccrual loans that are current	[1]	43,148	43,984
Financing Receivable, Recorded Investment, Nonaccrual Status		73,794	73,881
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		778,334	668,207
30-89 days past due		0	7,586
90+ days past due		1	46
Total past due		1	7,632
Loans and Leases Receivable, Gross		778,335	675,839
Accruing loans 90+ days past due		1	46
Nonaccrual loans that are current	[1]	852	951
Financing Receivable, Recorded Investment, Nonaccrual Status		852	951
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		9,290,756	8,469,390
30-89 days past due		8,806	10,424
90+ days past due		22,576	34,587
Total past due		31,382	45,011
Loans and Leases Receivable, Gross		9,322,138	8,514,401
Accruing loans 90+ days past due		12,349	21,697
Nonaccrual loans that are current	[1]	18,469	24,867
Financing Receivable, Recorded Investment, Nonaccrual Status		29,012	40,253
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		11,300,100	10,304,750
30-89 days past due		16,014	11,266
90+ days past due		24,679	39,887
Total past due		40,693	51,153
Loans and Leases Receivable, Gross		11,340,793	10,355,903
Accruing loans 90+ days past due		12,717	21,697
Nonaccrual loans that are current		18,779	26,612
1-4 Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		5,857,429	5,340,549
30-89 days past due		11,982	14,828
90+ days past due		21,303	26,722
Total past due		33,285	41,550
Loans and Leases Receivable, Gross		5,890,714	5,382,099
Accruing loans 90+ days past due		121	1,036
Nonaccrual loans that are current	[1]	11,342	20,939
Financing Receivable, Recorded Investment, Nonaccrual Status		35,577	50,254
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		479,383	374,987
30-89 days past due		3,258	8,593
90+ days past due		4,071	1,660
Total past due		7,329	10,253
Loans and Leases Receivable, Gross		486,712	385,240
Accruing loans 90+ days past due		2,557	1,337
Nonaccrual loans that are current	[1]	162	408
Financing Receivable, Recorded Investment, Nonaccrual Status		1,677	748
Bankcard And Other Revolving Plans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		477,426	440,358
30-89 days past due		2,406	1,861
90+ days past due		1,231	1,561
Total past due		3,637	3,422
Loans and Leases Receivable, Gross		481,063	443,780
Accruing loans 90+ days past due		1,181	1,217
Nonaccrual loans that are current	[1]	1,151	146
Financing Receivable, Recorded Investment, Nonaccrual Status		1,235	537
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		9,638,603	8,750,302
30-89 days past due		22,225	30,646
90+ days past due		32,647	33,677
Total past due		54,872	64,323
Loans and Leases Receivable, Gross		9,693,475	8,814,625
Accruing loans 90+ days past due		5,359	3,590
Nonaccrual loans that are current		17,199	24,629
Financing Receivable, Recorded Investment, Nonaccrual Status		49,470	59,995
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		508,045	634,390
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		171,934	149,880
30-89 days past due		0	0
90+ days past due		0	0
Total past due		0	0
Loans and Leases Receivable, Gross		171,934	149,880
Accruing loans 90+ days past due		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status		$ 40,330	$ 0
[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 Credi69

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, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	$ 13,451,886	$ 13,211,481
Leasing	422,969	441,666
Commercial Lending Loans - Owner Occupied	6,961,807	7,150,028
Loans and Leases Receivable, Gross, Commercial, Governments	778,335	675,839
Construction and land development	2,018,655	1,841,502
Term	9,322,138	8,514,401
Loans Receivable, Gross, Commercial, Real Estate	11,340,793	10,355,903
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,645,192	2,416,357
1-4 family residential	5,890,714	5,382,099
Loans and Leases Receivable, Gross, Consumer, Construction	486,712	385,240
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	481,063	443,780
Loans and Leases Receivable, Gross, Consumer, Other	189,794	187,149
Loans and Leases Receivable, Gross	42,649,265	40,649,542
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	13,451,886
Leasing	422,969
Commercial Lending Loans - Owner Occupied	6,961,807
Loans and Leases Receivable, Gross, Commercial, Governments	778,335
Loans and Leases Receivable before Fees, Gross	21,614,997	21,479,014
Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	2,018,655
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	9,322,138
Loans Receivable, Gross, Commercial, Real Estate	11,340,793	10,355,903
Loans and Leases Receivable, Gross	2,018,655	1,841,502
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,645,192
1-4 family residential	5,890,714
Loans and Leases Receivable, Gross, Consumer, Construction	486,712
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	481,063
Loans and Leases Receivable, Gross, Consumer, Other	189,794
Loans and Leases Receivable, Gross	189,794	187,149
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable before Fees, Gross	9,693,475	8,814,625
Loans and Leases Receivable, Gross	9,693,475	8,814,625
Pass [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
Construction and land development		1,786,610
Term		8,319,348
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	40,564,532	38,647,130
Pass [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	12,184,707
Leasing	387,275
Commercial Lending Loans - Owner Occupied	6,560,030
Loans and Leases Receivable, Gross, Commercial, Governments	765,025
Loans and Leases Receivable before Fees, Gross	19,897,037	19,802,162
Pass [Member] | Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	1,941,411
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	9,096,745
Loans Receivable, Gross, Commercial, Real Estate	11,038,156	10,105,958
Pass [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,629,285
1-4 family residential	5,850,771
Loans and Leases Receivable, Gross, Consumer, Construction	482,167
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	477,756
Loans and Leases Receivable, Gross, Consumer, Other	189,360
Pass [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable before Fees, Gross	9,629,339	8,739,010
Special Mention [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
Construction and land development		42,348
Term		47,245
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	508,045	634,390
Special Mention [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	266,027
Leasing	4,689
Commercial Lending Loans - Owner Occupied	96,464
Loans and Leases Receivable, Gross, Commercial, Governments	7,236
Loans and Leases Receivable before Fees, Gross	374,416	544,797
Special Mention [Member] | Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	51,931
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	81,698
Loans Receivable, Gross, Commercial, Real Estate	133,629	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
Special Mention [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable before Fees, Gross	0	0
Sub-Standard [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
Construction and land development		12,544
Term		139,036
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	1,572,420	1,359,095
Sub-Standard [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	997,872
Leasing	30,017
Commercial Lending Loans - Owner Occupied	305,313
Loans and Leases Receivable, Gross, Commercial, Governments	6,074
Loans and Leases Receivable before Fees, Gross	1,339,276	1,131,900
Sub-Standard [Member] | Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	25,313
Sub-Standard [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	143,695
Loans Receivable, Gross, Commercial, Real Estate	169,008	151,580
Sub-Standard [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	15,907
1-4 family residential	39,943
Loans and Leases Receivable, Gross, Consumer, Construction	4,545
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	3,307
Loans and Leases Receivable, Gross, Consumer, Other	434
Sub-Standard [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable before Fees, Gross	64,136	75,615
Doubtful [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
Construction and land development		0
Term		8,772
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	4,268	8,927
Doubtful [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	3,280
Leasing	988
Commercial Lending Loans - Owner Occupied	0
Loans and Leases Receivable, Gross, Commercial, Governments	0
Loans and Leases Receivable before Fees, Gross	4,268	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	0
Loans Receivable, Gross, Commercial, Real Estate	0	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
Doubtful [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable before Fees, Gross	0	0
Total Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross	567,522	606,048
Total Allowance [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable before Fees, Gross	420,720	454,277
Total Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	115,927	113,992
Total Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable before Fees, Gross	$ 30,875	$ 37,779

Loans And Allowance For Credi70

Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 602,656	$ 532,395
Impaired Financing Receivable, Recorded Investment	659,759	566,599
Impaired Financing Receivable, Related Allowance	63,223	48,697
Impaired Financing Receivable, Interest Income, Accrual Method	32,510	48,563
Impaired Financing Receivable, Unpaid Principal Balance	771,394	687,148
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	332,775	153,756
Impaired Financing Receivable, Recorded Investment	392,937	207,919
Impaired Financing Receivable, Related Allowance	52,164	30,538
Impaired Financing Receivable, Interest Income, Accrual Method	4,783	7,506
Impaired Financing Receivable, Unpaid Principal Balance	469,880	272,161
Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	98,903	125,777
Impaired Financing Receivable, Recorded Investment	100,696	126,267
Impaired Financing Receivable, Related Allowance	3,138	5,486
Impaired Financing Receivable, Interest Income, Accrual Method	9,082	12,450
Impaired Financing Receivable, Unpaid Principal Balance	110,779	141,526
Municipal [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	892	994
Impaired Financing Receivable, Recorded Investment	852	951
Impaired Financing Receivable, Related Allowance	0	0
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Impaired Financing Receivable, Unpaid Principal Balance	1,331	1,430
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	432,570	280,527
Impaired Financing Receivable, Recorded Investment	494,485	335,137
Impaired Financing Receivable, Related Allowance	55,302	36,024
Impaired Financing Receivable, Interest Income, Accrual Method	13,865	19,956
Impaired Financing Receivable, Unpaid Principal Balance	581,990	415,117
Term [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	76,421	111,074
Impaired Financing Receivable, Recorded Investment	69,712	117,225
Impaired Financing Receivable, Related Allowance	1,305	2,604
Impaired Financing Receivable, Interest Income, Accrual Method	12,810	16,971
Impaired Financing Receivable, Unpaid Principal Balance	78,991	142,239
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	87,327	127,266
Impaired Financing Receivable, Recorded Investment	83,419	131,859
Impaired Financing Receivable, Related Allowance	1,529	3,222
Impaired Financing Receivable, Interest Income, Accrual Method	15,135	23,381
Impaired Financing Receivable, Unpaid Principal Balance	100,882	165,030
Home Equity Credit Line [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	21,680	22,050
Impaired Financing Receivable, Recorded Investment	22,297	24,299
Impaired Financing Receivable, Related Allowance	477	243
Impaired Financing Receivable, Interest Income, Accrual Method	1,324	1,547
Impaired Financing Receivable, Unpaid Principal Balance	24,531	27,064
One Through Four Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	56,573	96,482
Impaired Financing Receivable, Recorded Investment	55,796	70,695
Impaired Financing Receivable, Related Allowance	5,549	8,736
Impaired Financing Receivable, Interest Income, Accrual Method	1,683	2,616
Impaired Financing Receivable, Unpaid Principal Balance	59,271	74,009
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2,487	2,288
Impaired Financing Receivable, Recorded Investment	2,622	2,003
Impaired Financing Receivable, Related Allowance	364	173
Impaired Financing Receivable, Interest Income, Accrual Method	132	123
Impaired Financing Receivable, Unpaid Principal Balance	3,128	2,741
Bankcard And Other Revolving Plans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	0	1
Impaired Financing Receivable, Recorded Investment	0	0
Impaired Financing Receivable, Related Allowance	0	0
Impaired Financing Receivable, Interest Income, Accrual Method	18	102
Impaired Financing Receivable, Unpaid Principal Balance	0	0
Consumer Other Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2,019	3,781
Impaired Financing Receivable, Recorded Investment	1,140	2,606
Impaired Financing Receivable, Related Allowance	2	299
Impaired Financing Receivable, Interest Income, Accrual Method	353	838
Impaired Financing Receivable, Unpaid Principal Balance	1,592	3,187
Commercial Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	10,906	16,192
Impaired Financing Receivable, Recorded Investment	13,707	14,634
Impaired Financing Receivable, Related Allowance	224	618
Impaired Financing Receivable, Interest Income, Accrual Method	2,325	6,410
Impaired Financing Receivable, Unpaid Principal Balance	21,891	22,791
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	82,759	124,602
Impaired Financing Receivable, Recorded Investment	81,855	99,603
Impaired Financing Receivable, Related Allowance	6,392	9,451
Impaired Financing Receivable, Interest Income, Accrual Method	3,510	5,226
Impaired Financing Receivable, Unpaid Principal Balance	88,522	107,001
Impaired Financing Receivable Recorded Investment With an Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	400,846	300,949
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	310,740	163,729
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	29,713	43,243
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	340,453	206,972
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Term [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	16,725	34,361
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	23,339	43,919
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Home Equity Credit Line [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	6,831	5,319
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	28,430	41,155
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	1,763	1,014
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] | Consumer Other Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	30	2,570
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	6,614	9,558
Impaired Financing Receivable Recorded Investment With an Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	37,054	50,058
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	258,913	265,650
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	82,197	44,190
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	70,983	83,024
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	852	951
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	154,032	128,165
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	52,987	82,864
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	60,080	87,940
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Home Equity Credit Line [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	15,466	18,980
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	27,366	29,540
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	859	989
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] | Consumer Other Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	1,110	36
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	7,093	5,076
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 44,801	$ 49,545

Loans And Allowance For Credi71

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, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 3,036	$ 3,405
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		481,063	443,780
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		150,916	194,084
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		250,920	297,088
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		646	999
Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		46,704	61,231
Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		59,798	55,556
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		822	1,684
Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		22,069	29,827
Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		17,786	19,447
Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		852	951
Commercial Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		68,773	91,058
Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		78,436	75,954
Construction And Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6,879	9,792
Construction And Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,764	3,697
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		18,035	29,558
Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		8,130	10,007
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		24,914	39,350
Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		9,894	13,704
Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		132	0
Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		14,268	15,421
Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,172	2,194
One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		308	722
One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		41,543	46,545
One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		8,176	10,942
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1,128	0
Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,296	1,710
Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,326	210
Consumer Other Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		481,063
Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		122	0
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1,468	2,683
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		1,568	722
Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		57,229	63,676
Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		11,674	13,346
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		28	883
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		28	883
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	0
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		28	883
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	0
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3,008	2,522
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		618	116
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		822	1,684
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		132	0
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		308	722
Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1,128	0
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1,440	1,800
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		1,568	722
Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		100,004	103,004
Multiple Modification Types [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		85,050	118,553
Multiple Modification Types [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		130,687	197,492
Multiple Modification Types [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		27,679	34,473
Multiple Modification Types [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		24,716	49,617
Multiple Modification Types [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		10,616	16,339
Multiple Modification Types [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		12,482	16,335
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		38,295	50,812
Multiple Modification Types [Member] | Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		37,198	65,952
Multiple Modification Types [Member] | Construction And Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,414	9,698
Multiple Modification Types [Member] | Construction And Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	208
Multiple Modification Types [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		10,403	20,833
Multiple Modification Types [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,939	5,203
Multiple Modification Types [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		13,817	30,531
Multiple Modification Types [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,939	5,411
Multiple Modification Types [Member] | Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,554	3,155
Multiple Modification Types [Member] | Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		670	233
Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		29,487	32,903
Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4,830	7,299
Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		897	1,152
Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	44
Multiple Modification Types [Member] | Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Multiple Modification Types [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		45,637	78,939
Multiple Modification Types [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		32,938	37,210
Multiple Modification Types [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		5,500	7,576
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	12,420	38,939
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	51,955	49,846
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]	43	23,207
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]	33,037	3,577
Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	7,832	9,879
Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1,045	34
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]	7,875	33,086
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]	34,082	3,611
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	0
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]	1,725	3,156
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1,776	2,249
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	2,474	2,960
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]	1,776	2,249
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]	4,199	6,116
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]	161	164
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]	2,608	3,440
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]	1,253	1,180
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]	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]	0	0
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]	39,535	10,907
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	2,769	3,604
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1,254	1,180
Payment Deferral [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,302	1,509
Payment Deferral [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6,680	4,350
Payment Deferral [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		67	100
Payment Deferral [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,085	1,879
Payment Deferral [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Payment Deferral [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,821	724
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		67	100
Payment Deferral [Member] | Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,906	2,603
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	0
Payment Deferral [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		979	976
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		979	976
Payment Deferral [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Payment Deferral [Member] | Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4	0
Payment Deferral [Member] | Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		35	54
Payment Deferral [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		252	433
Payment Deferral [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		292	136
Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,145	48
Payment Deferral [Member] | Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Payment Deferral [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		5,378	2,841
Payment Deferral [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		256	433
Payment Deferral [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,472	238
Principal Forgiveness [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		17,563	17,618
Principal Forgiveness [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		20,334	21,087
Principal Forgiveness [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	13
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		887	929
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		887	942
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		162	166
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		162	166
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		9,903	9,763
Principal Forgiveness [Member] | Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,036	1,400
Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6,476	6,747
Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,643	2,052
Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		13	0
Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		92	17
Principal Forgiveness [Member] | Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		122	0
Principal Forgiveness [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,771	3,469
Principal Forgiveness [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		16,514	16,510
Principal Forgiveness [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,771	3,469
Maturity Or Team Extension [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		24,610	7,439
Maturity Or Team Extension [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		28,258	11,723
Maturity Or Team Extension [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		18,674	3,236
Maturity Or Team Extension [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		185	455
Maturity Or Team Extension [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		191	681
Maturity Or Team Extension [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		837	1,669
Maturity Or Team Extension [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		852	951
Maturity Or Team Extension [Member] | Commercial Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		18,865	3,917
Maturity Or Team Extension [Member] | Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,874	3,075
Maturity Or Team Extension [Member] | Construction And Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,425	0
Maturity Or Team Extension [Member] | Construction And Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		39	333
Maturity Or Team Extension [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		224	638
Maturity Or Team Extension [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,058	0
Maturity Or Team Extension [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,649	638
Maturity Or Team Extension [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,097	333
Maturity Or Team Extension [Member] | Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,451	2,147
Maturity Or Team Extension [Member] | Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		431	500
Maturity Or Team Extension [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		419	353
Maturity Or Team Extension [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		158	275
Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		226	384
Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		88	101
Maturity Or Team Extension [Member] | Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Maturity Or Team Extension [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,648	4,284
Maturity Or Team Extension [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,096	2,884
Maturity Or Team Extension [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		677	876
Interest Rate Below Market [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		9,971	10,026
Interest Rate Below Market [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		13,006	12,590
Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		241	202
Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		775	28
Interest Rate Below Market [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,543	1,999
Interest Rate Below Market [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		601	685
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		2,784	2,201
Interest Rate Below Market [Member] | Commercial Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,376	713
Interest Rate Below Market [Member] | Construction And Land Development [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		40	94
Interest Rate Below Market [Member] | Construction And Land Development [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Interest Rate Below Market [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4,491	4,696
Interest Rate Below Market [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,659	1,844
Interest Rate Below Market [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4,531	4,790
Interest Rate Below Market [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,659	1,844
Interest Rate Below Market [Member] | Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		195	192
Interest Rate Below Market [Member] | Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	7
Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,301	2,669
Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		160	174
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] | Consumer Other Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	0
Interest Rate Below Market [Member] | Nonaccruing Trouble Debt Restructuring [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,035	2,564
Interest Rate Below Market [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,656	3,035
Interest Rate Below Market [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		$ 0	$ 7
[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 Credi72

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, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	[1]	$ (1,623)	$ (2,074)
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(497)	(540)
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(282)	(468)
Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		0	(2)
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(844)	(1,066)
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(297)	(261)
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(200)	(279)
Construction And Land Development [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(4)	(90)
Term [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(278)	(378)
1-4 Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(825)	(1,037)
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		$ (19)	$ (27)
[1]	Calculated based on the difference between the modified rate and the premodified rate applied to the recorded investment.

Loans And Allowance For Credi73

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, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3,036	$ 3,405
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	28	883
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	3,008	2,522
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	132	0
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	132	0
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	646	999
Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	28	883
Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	618	116
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	822	1,684
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	822	1,684
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,468	2,683
Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	28	883
Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,440	1,800
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	308	722
1-4 Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
1-4 Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	308	722
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,128	0
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	1,128	0
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,568	722
Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,568	$ 722

Loans And Allowance For Credi74

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, 2016	Dec. 31, 2015
Loans And Allowance For Credit Losses [Abstract]
Commercial	$ 44,960	$ 72,440
Commercial real estate	38,670	65,167
Consumer	8,504	11,082
Outstanding balance	92,134	148,689
Carrying amount	77,172	125,029
ALLL	568	945
Carrying amount, net	$ 76,604	$ 124,084

Loans And Allowance For Credi75

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, 2016	Dec. 31, 2015
Changes in Accretable Yield [Roll Forward]
Balance at beginning of period	$ 39,803	$ 45,055
Accretion	(24,479)	(40,077)
Reclassification from nonaccretable difference	11,167	22,190
Disposals and other	6,513	12,635
Balance at end of period	$ 33,004	$ 39,803

Derivative Instruments And He76

Derivative Instruments And Hedging Activities (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Other Comprehensvie Income Loss Reclassification Adjustment From AOCI on Derivative Instruments, Gross		$ 11,300	$ 9,000
Derivatives designated for hedges of investments in foreign operations		0
Derivative Liability, Fair Value, Gross Liability		59,200
Fair values of derivative assets reduced (increased) by net credit valuation adjustments		1,700	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	$ 2,000
Notional amount of bank and insurance trust preferred CDOs		6,209,146	$ 5,147,068
Cash collateral pledged for derivative liabilities		43,800
Additional collateral that would be required to be pledge if credit rating was downgraded by one notch		1,100
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities		$ 1,400

Derivative Instruments And He77

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, 2016		Dec. 31, 2015
Derivative [Line Items]
Total derivatives, Notional amount		$ 6,209,146		$ 5,147,068
Derivatives hedging instruments, liabilities		59,200
Amount of derivative gain (loss), recognized in OCI		7,912		12,124
Amount of derivative gain (loss), Reclassified from AOCI to interest income		11,290		9,004
Derivatives instruments, Noninterest income (expense)		25,744		16,959
Derivatives designated as hedging instruments, Offset to interest expense		0		1,504
Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		64,195		77,638
Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		59,221		72,568
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		1,387,500		1,387,500
Amount of derivative gain (loss), recognized in OCI		7,912		12,124
Amount of derivative gain (loss), Reclassified from AOCI to interest income		11,290		9,004
Derivatives designated as hedging instruments, Offset to interest expense		0		1,504
Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Amount of derivative gain (loss), recognized in OCI		7,912		12,124
Amount of derivative gain (loss), Reclassified from AOCI to interest income		11,290		9,004	[1]
Derivatives Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		2,289		5,461
Derivatives Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		1,148		956
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		1,387,500
Amount of derivative gain (loss), recognized in OCI		7,912	[2]	12,124
Amount of derivative gain (loss), Reclassified from AOCI to interest income		11,290	[2]	9,004
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]	2,289		5,461
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]	1,148		956
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		0		1,504
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		4,821,646		3,759,568
Derivatives instruments, Noninterest income (expense)		25,744		16,959
Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		61,906		72,177
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		58,073		71,612
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Total derivatives, Notional amount		235,167		40,314
Derivatives instruments, Noninterest income (expense)		1,096		0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		1,876		0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		351		8
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Total derivatives, Notional amount	[3]	4,162,264		3,256,190
Derivatives instruments, Noninterest income (expense)		13,952	[3]	7,438
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	[3]	48,754		51,353
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	[3]	49,050		53,843
Derivatives Not Designated As Hedging Instruments [Member] | Options Held [Member]
Derivative [Line Items]
Total derivatives, Notional amount		424,215		463,064
Derivatives Not Designated As Hedging Instruments [Member] | Options Held [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		11,276		20,824
Derivatives Not Designated As Hedging Instruments [Member] | Options Held [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		8,672		17,761
Derivatives Not Designated As Hedging Instruments [Member] | Futures Contracts [Member]
Derivative [Line Items]
Derivatives instruments, Noninterest income (expense)		0		2
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Derivatives instruments, Noninterest income (expense)		$ 10,696		$ 9,519
[1]	Amounts of $11.3 million for 2016 and $9.0 million for 2015 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, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Land	$ 229,398	$ 229,693
Investment Building and Building Improvements	683,450	598,643
Fixtures and Equipment, Gross	457,745	459,975
Leasehold Improvements, Gross	139,568	138,765
Capitalized Computer Software, Gross	354,763	295,428
Property, Plant and Equipment, Gross	1,864,924	1,722,504
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	845,416	817,042
Premises and equipment, net	$ 1,019,508	$ 905,462

Goodwill And Other Intangible79

Goodwill And Other Intangible Assets Goodwill and Other Intangible Assets (Narative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0	$ 0
Bank Susidiaries except The Commerce Bank of Oregon [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0

Goodwill And Other Intangible80

Goodwill And Other Intangible Assets (Amortizing Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 194,532	$ 194,532
Accumulated amortization	(186,112)	(178,260)
Net carrying amount	8,420	16,272
Goodwill impairment	0	0
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	166,518	166,518
Accumulated amortization	(158,444)	(151,157)
Net carrying amount	8,074	15,361
Customer Relationships And Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	28,014	28,014
Accumulated amortization	(27,668)	(27,103)
Net carrying amount	$ 346	$ 911

Goodwill And Other Intangible81

Goodwill And Other Intangible Assets (Schedule Of Estimated Amortization Expense) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Goodwill [Line Items]
2,013	$ 6,404
2,014	1,557
2,015	459
2,016	0
2,017	$ 0

Goodwill And Other Intangible82

Goodwill And Other Intangible Assets (Schedule Of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 1,014,129	$ 1,014,129
Impairment losses	0	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	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	0
Goodwill, Ending Balance	379,024	379,024
Amegy [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	615,591	615,591
Impairment losses	0	0
Goodwill, Ending Balance	$ 615,591	$ 615,591

Deposits (Narrative) (Details)

Deposits (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Contractual maturities, time deposits, $100,000 or more, domestic, less than 3 months [Abstract] [Abstract]	$ 417
Contractual maturities, time deposits, $100,000 or more, domestic, between 3 and 6 months [Abstract]	401
Contractual maturities, time deposits, $100,000 or more, between 6 and 12 months [Abstract]	679
Contractual maturities, time deposits, $100,000 or more, after 12 months [Abstract] [Abstract]	364
Domestic time deposits under $100,000	1,400	$ 1,500
Domestic time deposits $100,000 and over	1,400	584
Foreign time deposits $100,000 and over		112
Deposit overdrafts reclassified as loan balances	$ 11	$ 14

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of All Time Deposits) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
2,017	$ 2,139,822
2,018	291,826
2,019	110,993
2,020	109,927
2,021	103,738
Thereafter	504
Time Deposits, total	$ 2,756,810	$ 2,130,680

Short-Term Borrowings (Narrativ

Short-Term Borrowings (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Short-term Debt [Abstract]
Number of maturity days of short-term borrowings, maximum	30
Secured Debt, Repurchase Agreements Overnight	$ 58,000
Example1 of term repurchase security agreement term	30
Term repurchase securitiy agreement term example2	60
Secured Debt, Repurchase Agreements Term	$ 139,000
Percentage of outstanding advance for unencumbered collateral	100.00%
Amount available for FHLB advances	$ 13,000,000
FHLB Advances Redeemed, Par	500,000	$ 22,009
Amount available for federal reserve borrowings	$ 4,000,000

Short-Term Borrowings (Summary

Short-Term Borrowings (Summary Of Short-Term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Short-term Debt [Member]
Short-term Debt [Line Items]
Year-end balance	$ 827,269	$ 346,987	$ 244,223
Security Owned and Sold, Not yet Purchased Fair Value, Security Sold, Not yet Purchased	25,321	30,158	24,230
Other short-term borrowings	500,000	0	1,200
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Average amount outstanding	$ 104,866	$ 105,910	$ 104,358
Weighted average rate	0.29%	0.18%	0.17%
Highest month-end balance	$ 147,900	$ 122,461	$ 124,093
Year-end balance	$ 105,563	$ 111,263	$ 100,193
Weighted average rate on outstandings at year-end	0.51%	0.25%	0.15%
Security Repurchase Agreements [Member]
Short-term Debt [Line Items]
Average amount outstanding	$ 311,045	$ 127,358	$ 116,190
Weighted average rate	0.23%	0.11%	0.06%
Highest month-end balance	$ 823,744	$ 205,566	$ 156,710
Year-end balance	$ 196,385	$ 205,566	$ 118,600
Weighted average rate on outstandings at year-end	0.26%	0.15%	0.13%

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	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2016
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense						$ 5,000
Junior Subordinated Notes					$ 0	164,950
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					$ 126,144	(176,049)
Subordinated debt converted to preferred stock						104	$ 34
Senior medium-term notes					287,560	400,334
Gains (Losses) on Extinguishment of Debt					(353)	(2,530)	$ (44,422)
Long-term debt, Parent only maturities					381,699
Parent Company [Member]
Debt Instrument [Line Items]
Long-term debt, Parent only maturities					381,699
4.50%
Debt Instrument [Line Items]
Senior medium-term notes					152,411
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
redeemed [Member]
Debt Instrument [Line Items]
Junior Subordinated Notes					36,000			$ 129,000
AMEGY STATUTORY TRUSTS 2 [Member]
Debt Instrument [Line Items]
Junior Subordinated Notes					$ 0	$ 36,083

Long-Term Debt (Schedule Of Lon

Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Junior subordinated debentures related to trust preferred securities	$ 0	$ 164,950
Subordinated notes	246,550	246,170
Senior medium-term notes	287,560	400,334
Capital Lease Obligations	740	912
Long-term debt, total	$ 534,850	$ 812,366

Long-Term Debt (Schedule Of Tru

Long-Term Debt (Schedule Of Trust Preferred Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	$ 0	$ 0	$ 164,950
Amegy Trust I [Member]
Subordinated Borrowing [Line Items]
Maturity		Sep. 17, 2016
AMEGY STATUTORY TRUST ONE [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	$ 0	$ 0	51,547
Coupon Rate	3mL+2.85% (3.38%)
Amegy Trust II [Member]
Subordinated Borrowing [Line Items]
Maturity		Oct. 7, 2016
AMEGY STATUTORY TRUSTS 2 [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	$ 0	$ 0	36,083
Coupon Rate	3mL+1.90% (2.22%)
Amegy Trust III [Member]
Subordinated Borrowing [Line Items]
Maturity		Sep. 15, 2016
AMEGY STATUTORY TRUSTS 3 [Member] [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	$ 0	$ 0	61,856
Coupon Rate	3mL+1.78% (2.29%)
Stockmen's Trust II [Member]
Subordinated Borrowing [Line Items]
Maturity		Sep. 26, 2016
STOCKMEN S STATUTORY TRUST 2 [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	$ 0	$ 0	7,732
Coupon Rate	3mL+3.15% (3.75%)
Stockmen's Trust III [Member]
Subordinated Borrowing [Line Items]
Maturity		Sep. 17, 2016
STOCKMEN S STATUTORY TRUST 3 [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures related to trust preferred securities	$ 0	$ 0	$ 7,732
Coupon Rate	3mL+2.89% (3.42%)
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, 2016	May 15, 2014	Dec. 15, 2013	Dec. 31, 2015
Subordinated Borrowing [Line Items]
Long-Term Debt, Interest Rate 5.65%	5.65%
Subordinated notes, Balance	$ 246,550			$ 246,170
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	$ 160,195
Subordinated Notes Par Amount	$ 162,000
Subordinated notes, Maturity	Nov. 1, 2023
Interest payments begin		May 15, 2014
Subordinated Notes Interest Rate 6.95 Percent [Member]
Subordinated Borrowing [Line Items]
Subordinated notes, Balance	$ 86,355
Subordinated Notes Par Amount	$ 87,891
Subordinated notes, Maturity	Sep. 1, 2028
Interest payments begin			Dec. 15, 2013

Long-Term Debt (Schedule Of Sen

Long-Term Debt (Schedule Of Senior Medium-Term Notes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Senior medium-term notes	$ 287,560	$ 400,334
Senior Medium Term Notes, Par Amount	$ 309,088
Schedule Of Maturities On Long-Term Debt	(Amounts in thousands) 2016 Note type Coupon rate Min Coupon rate Max Senior notes 4.50 % 4.50 %
4.50%
Debt Instrument [Line Items]
Senior medium-term notes	$ 152,411
Senior Medium Term Notes, Par Amount	$ 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	$ 135,149
Senior Medium Term Notes, Par Amount	$ 145,231
Schedule Of Maturities On Long-Term Debt	June 1, 2023

Long-Term Debt (Schedule Of Mat

Long-Term Debt (Schedule Of Maturities On Long-Term Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Senior Medium Term Notes, Par Amount	$ 309,088
Schedule Of Maturities On Long-Term Debt	(Amounts in thousands) 2016 Note type Coupon rate Min Coupon rate Max Senior notes 4.50 % 4.50 %
2,013	$ 152,608
2,014	225
2,015	259
2,016	59
2,017	0
Thereafter	381,699
Long-term debt, excluding associated hedges	534,850
Long-term debt (less fair value hedges)	534,850	$ 812,366
Parent Company [Member]
Debt Instrument [Line Items]
2,013	152,411
2,014	0
2,015	0
2,016	0
2,017	0
Thereafter	381,699
Long-term debt, excluding associated hedges	$ 534,110
Senior Notes, Coupon Rate Range Min [Member]
Debt Instrument [Line Items]
Senior Notes, rate	4.50%

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, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Junior Subordinated Debt Redeemed, Par	$ 164,950	$ 3,093
Long-Term Subordinated Notes Redeemed, Par	0	84,444
Debt Redemptions and Repurchases, Par	265,418	287,695
Long-term Senior notes redeemed	100,468	27,281
FHLB Advances Redeemed, Par	500,000	22,009
Long-term Convertible Subordinated Notes Redeemed, Par	$ 0	150,868
Senior Notes, Coupon Rate Range Min [Member]
Debt Instrument [Line Items]
Senior Notes, rate	4.50%
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
Junior Subordinated Notes, Coupon Rate, 3mL 2.85% 3.38% [Member]
Debt Instrument [Line Items]
Junior Subordinated Debt Redeemed, Par	$ 51,547
Junior Subordinated Notes, Coupon Rate, 3mL 1.90% 2.22% [Member]
Debt Instrument [Line Items]
Junior Subordinated Debt Redeemed, Par	36,083
Junior Subordinated Notes, Coupon Rate, 3mL 1.78% 2.29% [Member]
Debt Instrument [Line Items]
Junior Subordinated Debt Redeemed, Par	61,856
Junior Subordinated Notes, Coupon Rate, 3mL 3.15% 3.75% [Member]
Debt Instrument [Line Items]
Junior Subordinated Debt Redeemed, Par	7,732
Junior Subordinated Notes, Coupon Rate, 3mL 2.89% 3.42% [Member]
Debt Instrument [Line Items]
Junior Subordinated Debt Redeemed, Par	7,732
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 3.30-3.70% [Member]
Debt Instrument [Line Items]
Long-term Senior notes redeemed		27,281
Long-Term Debt, Senior Note at 3.60% [Member]
Debt Instrument [Line Items]
Long-term Senior notes redeemed	11,108
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
Long-Term Debt, Senior Note at 4.00% [Member]
Debt Instrument [Line Items]
Long-term Senior notes redeemed	$ 89,360

Long-Term Debt Debt Extinguishm

Long-Term Debt Debt Extinguishment Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Extinguishment of Debt [Line Items]
Redemption Premium	$ 0	$ 2,395	$ 33,971
Schedule of Debt Extinguishment Costs [Table Text Block]	Debt extinguishment costs are as follows for the years 2016 , 2015 and 2014 : (In thousands) 2016 2015 2014 Early tender premiums $ — $ 2,395 $ 33,971 Write-offs of unamortized debt discount and issuance costs and fees 353 135 10,451 Total $ 353 $ 2,530 $ 44,422
Write off of unamortized debt discount and issuance costs	$ 353	135	10,451
Gains (Losses) on Extinguishment of Debt	$ (353)	$ (2,530)	$ (44,422)

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017USD ($)$ / shares	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)	Dec. 31, 2010shares	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		$ (44,898)	$ 48,422
Liquidation preference of preferred stock (per share) | $ / shares		$ 1,000
Preferred stock, authorized shares | shares		4,400,000	4,400,000
Carrying value, Preferred stock		$ 709,601	$ 828,490
Price per share | $ / shares						$ 36.27
Common Stock		$ 4,724,715	$ 4,766,731
Common Stock, Shares, Issued | shares		203,085,100	204,417,093
Warrants sold | shares					29,300,000
Common stock issued for preferred stock redemption		$ 126,144	$ (176,049)
Stock Repurchased During Period, Shares | shares		2,890,000
Stock Repurchased and Retired During Period, Value	$ (45,000)	$ 90,057
Treasury Stock Acquired, Average Cost Per Share | $ / shares	$ 42.43	$ 31.15
Treasury Stock Acquired, Repurchase Authorization	45
Preferred Stock, Tender Offer		$ 120,000
Preferred Stock, Liquidation Preference, Value		119,000
Payments for Repurchase of Redeemable Preferred Stock		126,144	175,669	$ 0
Preferred Stock Redemption		9,800
Total invested assets of trusts		91,000	81,800
Total obligations of trusts		105,200	96,900
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax		(76)	(331)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax		$ 5,356	374
Preferred stock, liquidation preference per depositary share | $ / shares		$ 25
Common Stock Held in Trust		$ 14,100	15,200
Warrant Exercise Price | $ / shares		$ 35.82
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
Carrying value, Preferred stock		$ 98,555	125,224
Preferred Stock, Dividend Rate, Percentage		5.80%
Common stock issued for preferred stock redemption			176,000
Preferred Stock, Tender Offer			180,000
Series A Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Preferred stock, authorized shares | shares		140,000,000
Variable dividend payment rate		> of 4.0% or 3mL+0.52%
Carrying value, Preferred stock		$ 66,316	66,316
Series F Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Preferred stock, authorized shares | shares		250,000,000
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]
Preferred stock, authorized shares | shares		200,000,000
Carrying value, Preferred stock		$ 138,391	171,827
Preferred Stock, Dividend Rate, Percentage		6.30%
Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Common stock issued for preferred stock redemption		$ 118,889	(175,669)
Retained Earnings [Member]
Schedule of Equity Method Investments [Line Items]
Common stock issued for preferred stock redemption		9,759	(3,449)
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		$ (2,504)	$ 3,069
Stock Repurchased During Period, Shares | shares		(2,888,946)
Stock Repurchased and Retired During Period, Value		$ 90,057
Series G Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Preferred Stock, Liquidation Preference, Value		33,000
Series I Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Preferred Stock, Liquidation Preference, Value		27,000
SERIES J STOCK [Member]
Schedule of Equity Method Investments [Line Items]
Preferred Stock, Liquidation Preference, Value		$ 59,000

Shareholders' Equity (Summary O

Shareholders' Equity (Summary Of Preferred Stock) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Common Stock Held in Trust	$ 15,200	$ 14,100
Preferred stock, authorized shares	4,400,000	4,400,000
Carrying value, Preferred stock	$ 828,490	$ 709,601
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	66,316	$ 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		138,391,000
Carrying value, Preferred stock	$ 171,827	$ 138,391
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		98,555,000
Carrying value, Preferred stock	$ 125,224	$ 98,555
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		136,368,000
Carrying value, Preferred stock	$ 195,152	$ 136,368
Preferred Stock, Dividend Rate, Percentage		7.20%

Shareholders' Equity (Summary97

Shareholders' Equity (Summary Of Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated other comprehensive income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (121,581)				$ (54,612)				$ (121,581)	$ (54,612)	$ (128,041)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax									(44,898)	48,422
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax									(76)	(331)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax									5,356	374
Other Comprehensive Income (Loss), Tax									(39,618)	48,465
Other comprehensive income (loss)									(66,969)	73,429	64,060
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									(65,136)	(10,729)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(1,833)	84,158
Income Tax Expense (Benefit)									235,858	142,388	222,961
Net earnings (loss) applicable to common shareholders	124,990	$ 116,895	$ 90,647	$ 78,777	88,197	$ 84,238	$ (1,100)	$ 75,279	411,309	246,614	326,568
Reclassification of amortization of net actuarial gains losses pension and post retirement from AOCI, gross									(8,436)	(5,996)	(2,843)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax									0	0	(50)
Reclassification of pension and postretirement from accumulated other comprehensive income, tax									(3,206)	(2,278)	(1,103)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated other comprehensive income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(92,417)				(18,369)				(92,417)	(18,369)	(91,921)
Other comprehensive income (loss)									(74,048)	73,552
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									(73,985)	(12,471)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(63)	86,023	(5,320)
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	1,639				1,546				1,639	1,546	2,226
Other comprehensive income (loss)									93	(680)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									7,093	4,903
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(7,000)	(5,583)
Net earnings (loss) applicable to common shareholders									7,000	5,583	1,605
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated other comprehensive income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (30,803)				$ (37,789)				(30,803)	(37,789)	(38,346)
Other comprehensive income (loss)									6,986	557
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									1,756	(3,161)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									5,230	3,718	1,790
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	0	(1,878)
Income Tax Expense (Benefit)									0	0	(10)
Net earnings (loss) applicable to common shareholders									0	0	(17)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net									0	0	(27)
Increase (Decrease) in Deferred Income Taxes									0	0	767
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									102	(138,735)	10,419
Income Tax Expense (Benefit)									39	(52,712)	3,971
Net earnings (loss) applicable to common shareholders									63	(86,023)	6,448
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									11,290	9,004	2,594
Income Tax Expense (Benefit)									$ 4,290	$ 3,421	$ 989

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended			180 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	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	$ 4,100	4,300
Deferred tax assets net operating loss and tax credit carryforwards expiring through 2030	500
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	3,400	3,900
Accrued interest and penalties recognized net of federal and/or state tax benefits	$ 100	$ 700
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, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Current Federal, Income taxes (benefit)	$ 217,400	$ 158,164	$ 178,450
Deferred Federal Income taxes (benefit)	(4,108)	(31,843)	14,277
Federal Income taxes (benefit) total	213,292	126,321	192,727
Current State, Income taxes (benefit)	26,900	14,027	18,573
Deferred State, Income taxes (benefit)	(4,334)	2,040	11,661
State Income taxes (benefit) total	22,566	16,067	30,234
Income Tax Expense (Benefit), Total	$ 235,858	$ 142,388	$ 222,961

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, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Income tax expense (benefit) at statutory federal rate	$ 246,718	$ 158,151	$ 217,498
State income taxes, net	14,668	10,443	19,652
Other nondeductible expenses	3,149	3,205	2,949
Nontaxable income	(24,688)	(20,397)	(17,869)
Tax credits and other taxes	(1,704)	(2,926)	(1,717)
Other	(2,285)	(6,088)	2,448
Income Tax Expense (Benefit), Total	$ 235,858	$ 142,388	$ 222,961

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, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Gross deferred tax assets, Book loan loss deduction in excess of tax	$ 240,881	$ 254,223
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	19,332	24,749
Gross deferred tax assets, Deferred compensation	87,420	91,665
Gross deferred tax assets, Security investments and derivative fair value adjustments	56,628	11,254
Gross deferred tax assets, Net operating losses, capital losses and tax credits	4,664	4,659
FDIC Supported Transactions	5,086	9,157
Gross deferred tax assets, Other	46,052	46,016
Gross deferred tax assets	460,063	441,723
Gross deferred tax assets, Valuation allowance	(4,100)	(4,300)
Total deferred tax assets	455,936	437,462
Gross deferred tax liabilities, Core deposits and purchase accounting	(1,140)	(3,392)
Gross deferred tax liabilities, Premises and equipment, due to differences in depreciation	(7,548)	(10,588)
Gross deferred tax liabilities, FHLB stock dividends	(3,800)	(10,042)
Gross deferred tax liabilities, Leasing operations	(75,109)	(85,255)
Gross deferred tax liabilities, Prepaid expenses	(6,534)	(9,001)
Gross deferred tax liabilities, Prepaid pension reserves	(17,659)	(18,087)
Deferred Tax Liabilities, Mortgage Servicing Rights	(9,844)	(6,845)
Gross deferred tax liabilities, Subordinated debt modification	(30,762)	(46,451)
Deferred Tax Liabilities, Financing Arrangements	25,425	23,723
Deferred Tax Liabilities, Investments	27,651	21,037
Total deferred tax liabilities	(205,472)	(234,421)
Net deferred tax assets	$ 250,464	$ 203,041

Income Taxes (Schedule Of Recon

Income Taxes (Schedule Of Reconciliation Of Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Balance at beginning of year	$ 4,289	$ 5,448	$ 3,255	$ 2,385
Tax positions related to current year, Additions	1,554	786	0
Tax positions related to current year, Reductions	0	0	0
Tax positions related to prior years, Additions	542	1,407	870
Tax positions related to prior years, Reductions	0	0	0
Tax Adjustments, Settlements, and Unusual Provisions	0	0	0
Lapses in statutes of limitations	(3,255)	0	0
Balance at end of year	$ 4,289	$ 5,448	$ 3,255

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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 137,401	$ 127,263	$ 113,949	$ 90,437	$ 102,487	$ 100,999	$ 13,960	$ 92,025	$ 469,050	$ 309,471	$ 398,462
Less common and preferred dividends, Basic									(115,418)	(107,990)	(103,111)
Undistributed Earnings, Diluted									353,632	201,481	295,351
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									3,802	1,836	2,933
Undistributed earnings (loss) applicable to nonvested shares, Basic									349,830	199,645	292,418
Distributed earnings applicable to common shares, Basic									(57,180)	(44,816)	(30,983)
Net earnings (loss) applicable to common shareholders									$ 407,010	$ 244,461	$ 323,401
Weighted average common shares outstanding									203,855	203,265	192,207
Net earnings (loss) per common share, Basic	$ 0.61	$ 0.57	$ 0.44	$ 0.38	$ 0.43	$ 0.41	$ (0.01)	$ 0.37	$ 2	$ 1.20	$ 1.68
Additional weighted average dilutive shares, Diluted									414	433	582
Weighted average diluted common shares outstanding, Diluted									204,269	203,698	192,789
Net earnings (loss) per common share, Diluted	$ 0.60	$ 0.57	$ 0.44	$ 0.38	$ 0.43	$ 0.41	$ (0.01)	$ 0.37	$ 1.99	$ 1.20	$ 1.68

Net Earnings Per Common Share N

Net Earnings Per Common Share Net Earnings Per Common Share Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Preferred stock redemption	$ 0	$ 0	$ (9,759)	$ 0	$ (9,759)	$ 0	$ 0

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock			63,255
Restricted Stock Units expected to vest			1,370,435
Share Based Compensation Restricted Stock Value			$ 2.7
Share Based Compensation Restricted Stock Units Aggregate Intrinsic Value			$ 59
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price			$ 25.03
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	5 years 6 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value			$ 26.9
Restricted Stock Units Outstanding	1,798,543	1,769,420	2,047,158	1,798,543	1,769,420	1,522,038
Weighted Average Grant Price of Restricted Stock Forfeited			$ 26.28	$ 27.17	$ 25.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 27.30	$ 31.60	$ 26.44	$ 27.30	$ 31.60	$ 35.54
Stock Options without a fixed expiration date			21,252
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			5,685,169
Compensation expense not yet recognized for nonvested share-based awards			$ 25.7
Nonvested share-based awards, expected weighted average period to be recognized, years	2 years 3 months 18 days
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options			1.5	$ 0.8	$ 0.4
Total intrinsic value of stock options exercised			10	6.7	3.9
Cash received from the exercise of stock options			23.8	22.7	$ 10.6
Aggregate intrinsic value of outstanding stock options	$ 8		58.9	8
Aggregate intrinsic value of exercisable options	$ 8		$ 31	$ 8
Outstanding stock options, Weighted average remaining contractual life (years)	3 years	3 years 36 days	4 years 1 month 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number			1,491,656
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	3,804,095	5,630,502	3,437,910	3,804,095	5,630,502	5,874,590
Total fair value of restricted stock vesting			$ 19.4		$ 15.2
Weighted average issue price			$ 24.43	$ 29.02	$ 28.87
Total fair value granted			$ 19.4		$ 15.2
Stock Issued During Period, Shares, Restricted Stock Award, Gross			36,594	22,441	16,670
Restricted Stock Units Granted			1,033,167	790,929	727,300
Weighted Average Grant Price of Restricted Stock Units Granted			$ 21.69	$ 29.06	$ 28.81
Restricted Stock Units Vested			(724,713)	(673,385)	(416,755)
Weighted Average Grant Price of Restricted Stock Units Vested			$ 25.88	$ 24.78	$ 22.26
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross					16,670
Restricted Stock Units Granted			32,310	31,080	6,656

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, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation [Abstract]
Compensation expense	$ 26,144	$ 24,974	$ 23,632
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 8,762	$ 8,284	$ 7,767

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, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation [Abstract]
Weighted average of fair value for options granted	$ 5.24	$ 6.17	$ 6.10
Expected dividend yield	1.30%	1.30%	1.30%
Expected volatility	30.00%	25.00%	25.10%
Risk-free interest rate	1.21%	1.57%	1.55%
Expected life (in years)	5 years	5 years	5 years

Share-Based Compensation (Summa

Share-Based Compensation (Summary Of Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Balance, Number of shares	3,804,095	5,630,502	5,874,590
Balance, Weighted average exercise price	$ 27.30	$ 31.60	$ 35.54
Granted, Number of shares	789,651	740,300	947,758
Granted, Weighted average exercise price	$ 21.25	$ 29.01	$ 28.67
Exercised, Number of shares	1,055,532	1,165,287	489,905
Exercised, Weighted average exercise price	$ 23.75	$ 25.11	$ 21.60
Expired, Number of shares	(56,297)	(1,322,067)	(618,207)
Expired, Weighted average exercise price	$ 61.60	$ 48.44	$ 73.28
Forfeited, Number of shares	(44,007)	(79,353)	(83,734)
Forfeited, Weighted average exercise price	$ 27.66	$ 28.09	$ 25.72
Balance, Number of shares	3,437,910	3,804,095	5,630,502
Balance, Weighted average exercise price	$ 26.44	$ 27.30	$ 31.60
Outstanding stock options exercisable, Number of shares	1,892,136	2,187,259	3,804,873
Outstanding stock options exercisable, Weighted average exercise price	$ 27.60	$ 26.35	$ 33.86

Share-Based Compensation (Sched

Share-Based Compensation (Schedule Of Additional Selected Information On Stock Options) (Details) - $ / shares	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding stock options, Number of shares	3,804,095	5,630,502	3,437,910	5,874,590
Outstanding stock options, Weighted average exercise price	$ 27.30	$ 31.60	$ 26.44	$ 35.54
Outstanding stock options, Weighted average remaining contractual life (years)	3 years	3 years 36 days	4 years 1 month 12 days
Exercisable stock options, Number of shares	2,187,259	3,804,873	1,892,136
Exercisable stock options, Weighted average exercise price	$ 26.35	$ 33.86	$ 27.60
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			277,859
Outstanding stock options, Weighted average exercise price			$ 17.81
Outstanding stock options, Weighted average remaining contractual life (years)			2 years 5 months
Exercisable stock options, Number of shares			277,859
Exercisable stock options, Weighted average exercise price			$ 17.81
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			1,121,039
Outstanding stock options, Weighted average exercise price			$ 21.97
Outstanding stock options, Weighted average remaining contractual life (years)			4 years 5 months
Exercisable stock options, Number of shares			382,396
Exercisable stock options, Weighted average exercise price			$ 23.84
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			1,877,880
Outstanding stock options, Weighted average exercise price			$ 28.35
Outstanding stock options, Weighted average remaining contractual life (years)			4 years 5 months
Exercisable stock options, Number of shares			1,088,210
Exercisable stock options, Weighted average exercise price			$ 28.14
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)			3 years 4 months
Exercisable stock options, Number of shares			34,918
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)			1 year 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 month 15 days
Exercisable stock options, Number of shares			2,553
Exercisable stock options, Weighted average exercise price			$ 72.08
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)			4 months 18 days
Exercisable stock options, Number of shares			36,000
Exercisable stock options, Weighted average exercise price			$ 83.38

Share-Based Compensation (Su110

Share-Based Compensation (Summary Of Restricted Stock Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation [Abstract]
Nonvested restricted shares, Number of shares	63,255	59,370	161,220	410,950
Nonvested restricted shares, Weighted average issue price	$ 25.43	$ 23.49	$ 21.82	$ 22.46
Issued, Number of shares	36,594	22,441	16,670
Issued, Weighted average issue price	$ 24.43	$ 29.02	$ 28.87
Vested, Number of shares	(32,709)	(123,161)	(256,890)
Vested, Weighted average issue price	$ 20.80	$ 22.32	$ 23.23
Forfeited, Number of shares		(1,130)	(9,510)
Forfeited, Weighted average issue price		$ 23.54	$ 23.68

Share-Based Compensation Share

Share-Based Compensation Share Based Compensation (Summmary of Restricted Stock Unit Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units Outstanding	2,047,158	1,798,543	1,769,420	1,522,038
Weighted Average Grant Price of Restricted Stock Units	$ 25.08	$ 27.39	$ 25.64	$ 23.19
Restricted Stock Units Granted	1,033,167	790,929	727,300
Weighted Average Grant Price of Restricted Stock Units Granted	$ 21.69	$ 29.06	$ 28.81
Restricted Stock Units Vested	(724,713)	(673,385)	(416,755)
Restricted Stock Units Forfeited	(59,839)	(88,421)	(63,163)
Weighted Average Grant Price of Restricted Stock Units Vested	$ 25.88	$ 24.78	$ 22.26
Weighted Average Grant Price of Restricted Stock Forfeited	$ 26.28	$ 27.17	$ 25.48

Guarantees, Commitments And Con

Guarantees, Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Guarantor Obligations [Line Items]
Operating Leases, Future Minimum Payments, Due in Three Years	$ 36,074
Operating Leases, Future Minimum Payments, Due in Four Years	31,043
Operating Leases, Future Minimum Payments, Due in Five Years	25,670
Operating Leases, Future Minimum Payments Due, Next Twelve Months	44,797
Operating Leases, Future Minimum Payments, Due Thereafter	94,049
Commitments to Extend Credit Expiring in One Year	5,900,000
standby letters of credit expiring in one year	568,000
Standby Letters of Credit, Thereafter	398,000
Guarantor Obligations, Current Carrying Value	4,700
Reserve for Unfunded Lending Commitments	1,600
Letters of Credit, Deferred Commitment Fees	3,100
Private Equity and other noninterest bearing investments [Table Text Block]	26,000
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule	4,000
Risk-weighted values assigned to all off-balance sheet financial and derivative instruments	6,500,000	$ 6,300,000
Cash Reserve Deposit Required and Made	353,600
Capital Lease Obligations, Current	1,200
Accumulated Amortization, Deferred Finance Costs	1,000
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	1,100
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Two Years	1,100
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Three Years	900
Operating Leases, Future Minimum Payments Receivable, in Four Years	100
Operating Leases, Rent Expense, Net	64,800	$ 62,500	$ 59,200
Minimum [Member]
Guarantor Obligations [Line Items]
Loss Contingency, Range of Possible Loss, Minimum	0
Maximum [Member]
Guarantor Obligations [Line Items]
Loss Contingency, Range of Possible Loss, Minimum	$ 20,000

Guarantees, Commitments And 113

Guarantees, Commitments And Contingencies (Schedule Of Guarantees Issued) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Guarantor Obligations [Line Items]
Unused Commitments to Extend Credit	$ 18,273,714	$ 17,169,785
Commercial letters of credit	60,320	18,447
Total Unfunded Lending Commitments	19,300,754	18,066,629
Financial Guarantee [Member]
Guarantor Obligations [Line Items]
Letters Of Credit Standby	771,269	661,554
Performance Guarantee [Member]
Guarantor Obligations [Line Items]
Letters Of Credit Standby	$ 195,451	$ 216,843

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, 2016	Dec. 31, 2015
Parent Company [Member]
Total capital (to risk-weighted assets), Actual Amount	$ 7,608,502	$ 7,535,760
Capital to Risk Weighted Assets	15.24%	16.12%
Total capital (to risk-weighted assets), To be well capitalized, Amount	$ 4,993,671	$ 4,674,725
Total capital (to risk-weighted assets), To be well capitalized, Ratio	10.00%	10.00%
Tier 1 capital (to risk-weighted assets), Actual Amount	$ 6,737,638	$ 6,580,326
Tier One Leverage Capital to Average Assets	11.09%	1126.00%
Tier 1 capital (to risk-weighted assets), Actual Ratio	13.49%	1408.00%
Tier 1 capital (to risk-weighted assets), To be well capitalized, Amount	$ 3,994,937	$ 3,739,780
Tier 1 capital (to risk-weighted assets), To be well capitalized, Ratio	8.00%	800.00%
Common Equity Tier One Capital	$ 6,028,037	$ 5,711,836
Common Equity Tier One Capital Ratio	12.07%	1222.00%
Common Equity Tier One Capital to be Well Capitalized	$ 3,245,886	$ 3,038,571
Common Equity Tier One Capital to be Well Capitalized Ratio	6.50%	650.00%
Tier One Capital	$ 6,737,638	$ 6,580,326
ZB National Association [Member]
Total capital (to risk-weighted assets), Actual Amount	$ 7,277,987	$ 6,918,312
Capital to Risk Weighted Assets	14.61%	1484.00%
Total capital (to risk-weighted assets), To be well capitalized, Amount	$ 4,983,000	$ 4,661,581
Total capital (to risk-weighted assets), To be well capitalized, Ratio	10.00%	1000.00%
Tier 1 capital (to risk-weighted assets), Actual Amount	$ 6,654,990	$ 6,334,391
Tier One Leverage Capital to Average Assets	10.99%	1097.00%
Tier One Capital Required to be Well Capitalized	$ 3,027,427	$ 2,886,732
Tier 1 capital (to risk-weighted assets), Actual Ratio	13.36%	1359.00%
Tier 1 capital (to risk-weighted assets), To be well capitalized, Amount	$ 3,986,400	$ 3,729,265
Tier 1 capital (to risk-weighted assets), To be well capitalized, Ratio	8.00%	800.00%
Common Equity Tier One Capital	$ 5,824,090	$ 5,503,491
Common Equity Tier One Capital Ratio	11.69%	1181.00%
Common Equity Tier One Capital to be Well Capitalized	$ 3,238,950	$ 3,030,028
Common Equity Tier One Capital to be Well Capitalized Ratio	6.50%	650.00%
Tier One Capital	$ 6,654,990	$ 6,334,391
Tier One Capital Required to be Well Capitalized to Average Assets	5.00%	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, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 4,000
Settlement loss - net periodic benefit cost (credit)	2,235	$ 0	$ 0
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	9,988
Net gain (loss) in AOCI expected to be recognized in next year	(4,866)
Defined Benefit Plan, Benefit Obligation	165,129	173,208	185,944
Service cost	0	0	0
Interest cost	6,995	7,094	7,468
Expected return on plan assets	(11,397)	(12,360)	(13,305)
Defined Benefit Plan, Amortization of Gains (Losses)	6,149	5,926	2,895
Defined Benefit Plan, Actuarial Net (Gains) Losses	(2,097)	(8,085)
Defined Benefit Plan, Fair Value of Plan Assets	161,667	157,318	170,199
Defined Benefit Plan, Actual Return on Plan Assets	13,326	(1,136)
Defined Benefit Plan, Contributions by Employer	4,000	0
Defined Benefit Plan, Benefits Paid	(12,977)	(11,745)
Defined Benefit Plan, Funded Status of Plan	(3,462)	(15,890)
Defined Benefit Plan, Net Periodic Benefit Cost	3,982	660	(2,942)
Pension and Other Postretirement Defined Benefit Plans, Liabilities	3,462	15,890
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(47,658)	(60,067)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	(47,658)	(60,067)
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	10,051
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	9,821
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	10,181
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	10,268
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	50,166
Supplemental Employee Retirement Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	1,911
Net gain (loss) in AOCI expected to be recognized in next year	(123)
Defined Benefit Plan, Benefit Obligation	9,720	9,994	10,595
Service cost	0	0	0
Interest cost	402	403	454
Defined Benefit Plan, Amortization of Gains (Losses)	117	123	19
Amortization of prior service cost (credit)	0	0	50
Defined Benefit Plan, Actuarial Net (Gains) Losses	110	(226)
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	786	778
Defined Benefit Plan, Benefits Paid	(786)	(778)
Defined Benefit Plan, Funded Status of Plan	(9,720)	(9,994)
Settlement loss - net periodic benefit cost (credit)	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	519	526	523
Pension and Other Postretirement Defined Benefit Plans, Liabilities	9,720	9,994
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(2,281)	(2,288)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	(2,281)	(2,288)
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	855
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	882
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	834
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	766
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	3,309
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	94
Net gain (loss) in AOCI expected to be recognized in next year	52
Defined Benefit Plan, Benefit Obligation	939	954	1,067
Service cost	21	33	31
Interest cost	38	40	47
Defined Benefit Plan, Amortization of Gains (Losses)	(67)	(53)	(71)
Amortization of prior service cost (credit)	0	0	0
Defined Benefit Plan, Actuarial Net (Gains) Losses	7	(121)
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	81	65
Defined Benefit Plan, Benefits Paid	(81)	(65)
Defined Benefit Plan, Funded Status of Plan	(939)	(954)
Defined Benefit Plan, Net Periodic Benefit Cost	(8)	20	$ 7
Pension and Other Postretirement Defined Benefit Plans, Liabilities	939	954
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	258	332
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	258	$ 332
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	99
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	100
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	103
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	98
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 419

Retirement Plans (Narrative) (D

Retirement Plans (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 4,000
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	$ 19,900	$ 26,200
Benefit liability other supplement retirement plans	$ 6,400	6,900
Shares of company common stock | shares	233,849
Dividends received under the plan	$ 65	56
Rate of employee contribution from earnings	80.00%
Matching contribution allocation rate first time	100.00%
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	$ 26,100	25,500	$ 24,300
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	$ 6,300	$ 6,100	$ 12,000
Contribution rate of profit sharing expenses	0.01		0.02
Composite market value factor, at end of period	1.042254	1.063133
Limited Partnerships, Capital Commitment	$ 8,750
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%
Limited Liability Partnerships [Member]
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	$ 5,100	$ 6,200

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, 2016	Dec. 31, 2015
Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Administration Expenses	$ (481)	$ (376)
Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	9,484
Fair value of plan assets at end of year	11,082	9,484
Defined benefit plan investment purchases	14,974	10,428
Purchases	(12,976)	(11,739)
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	(151)	(628)
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	232	284
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	9,484	11,515
Fair value of plan assets at end of year	11,082	9,484
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	9,484
Fair value of plan assets at end of year	$ 11,082	$ 9,484

Retirement Plans (Schedule Of W

Retirement Plans (Schedule Of Weighted Average Assumptions Based On The Pension Plan) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Discount rate, benefit obligation	4.10%	4.20%	3.95%
Discount rate, net periodic benefit cost	420.00%	395.00%	460.00%
Expected long-term return on plan assets, net periodic benefit cost	750.00%	750.00%	800.00%

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, 2016	Dec. 31, 2015	Dec. 31, 2014
Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 11,082	$ 9,484
Guaranteed Deposit Account [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	11,082	9,484	$ 11,515
Guaranteed Deposit Account [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	11,082	9,484
Limited Liability Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	5,100	6,200
Common Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	10,170	6,482
Common Stock [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	10,170	6,482
Common Stock [Member] | Insurance Company Pooled Separate Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	91,900	88,400
Debt Investments [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	5,810	5,250
Debt Investments [Member] | Mutual Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	5,810	5,250
Debt Investments [Member] | Insurance Company Pooled Separate Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	28,800	31,700
Real Estate [Member] | Insurance Company Pooled Separate Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan investments	$ 8,100	$ 9,900

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, 2016	Dec. 31, 2015	Dec. 31, 2014
Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan investment sales	$ (12,976)	$ (11,739)
Defined Benefit Plan, Fair Value of Plan Assets	11,082	9,484
Defined benefit plan investment purchases	14,974	10,428
Guaranteed Deposit Account [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	11,082	9,484	$ 11,515
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)	(151)	(628)
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)	232	284
Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Administration Expenses	$ 481	$ 376

Retirement Plans Retirement Pla

Retirement Plans Retirement Plans (Unfunded Commitments and Redemption) (Details) $ in Thousands	Dec. 31, 2016USD ($)
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, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Other noninterest-bearing investments valued under the cost method	$ 13,300,000	$ 25,300,000
Fair value of AFS securities	13,372,194,000	7,643,116,000
Principal amount of other real estate owned property sold	12,800,000	19,200,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	211,400,000	191,500,000
OREO Properties [Member]
Derivatives, Fair Value [Line Items]
Net gains on sale of OREO properties	3,700,000	4,000,000
Impairment of OREO properties	200,000	600,000
Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	13,188,495,000	7,581,309,000
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0	$ 0
Third Party Pricing Service [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	$ 0.91

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, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	$ 13,372,194	$ 7,643,116
Trading account, at fair value	114,803	48,168
Total assets	14,288,600	8,473,516
Securities sold, not yet purchased	25,321	30,158
Other liabilities		187,167
Financial and Nonfinancial Liabilities, Fair Value Disclosure	175,582
Mutual Funds And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	184,416	100,636
Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	497,466	485,978
Private Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	128,654	120,027
Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	20,248	13,514
Warranty, Rights and Obligations, Fair Value Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	91,040	84,570
Other liabilities	91,040	84,570
Available-for-sale Securities [Member] | U.S. Treasury, Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	12,009,676	7,100,844
Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	1,154,210	418,695
Asset-Backed Securities [Member] | Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	23,892	22,941
Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	64,195	78,143
Other liabilities	59,221
Derivatives [Member] | Interest Rate Related And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	4,165	5,966
Other liabilities	1,499	835
Derivatives [Member] | Interest Rate Swaps For Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	48,754	51,353
Other liabilities	49,050	53,843
Derivatives [Member] | Foreign Currency Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	11,276	20,824
Other liabilities	8,672	17,761
Derivatives [Member] | Total Return Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities		72,439
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	183,699	61,807
Total assets	286,015	167,201
Securities sold, not yet purchased	25,321	30,158
Other liabilities		132,489
Financial and Nonfinancial Liabilities, Fair Value Disclosure	125,033
Level 1 [Member] | Mutual Funds And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	183,699	61,807
Level 1 [Member] | Warranty, Rights and Obligations, Fair Value Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	91,040	84,570
Other liabilities	91,040	84,570
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	11,276	20,824
Other liabilities	8,672
Level 1 [Member] | Derivatives [Member] | Foreign Currency Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	11,276	20,824
Other liabilities	8,672	17,761
Level 1 [Member] | Derivatives [Member] | Total Return Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities		17,761
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	13,188,495	7,581,309
Trading account, at fair value	114,803	48,168
Total assets	13,853,683	8,172,774
Securities sold, not yet purchased	0	0
Other liabilities		54,678
Financial and Nonfinancial Liabilities, Fair Value Disclosure	50,549
Level 2 [Member] | Mutual Funds And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	717	38,829
Level 2 [Member] | Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	497,466	485,978
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	12,009,676	7,100,844
Level 2 [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	1,154,210	418,695
Level 2 [Member] | Asset-Backed Securities [Member] | Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	23,892	22,941
Level 2 [Member] | Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	52,919	57,319
Other liabilities	50,549
Level 2 [Member] | Derivatives [Member] | Interest Rate Related And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	4,165	5,966
Other liabilities	1,499	835
Level 2 [Member] | Derivatives [Member] | Interest Rate Swaps For Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	48,754	51,353
Other liabilities	49,050	53,843
Level 2 [Member] | Derivatives [Member] | Total Return Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities		54,678
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	0	0
Total assets	148,902	133,541
Securities sold, not yet purchased	0	0
Other liabilities		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | Private Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	128,654	120,027
Fair Value, Inputs, Level 3 [Member] | Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	20,248	13,514
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
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 assets	0	0
Other liabilities	$ 0
Fair Value, Inputs, Level 3 [Member] | Derivatives [Member] | Total Return Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities		$ 0

Fair Value (Schedule Of Asse124

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, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	$ 0
Derivative Instruments, Gain (Loss) [Table Text Block]	Year Ended December 31, 2016 Year Ended December 31, 2015 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 $ 7,912 $ 11,290 $ 12,124 $ 9,004 7,912 11,290 3 12,124 9,004 3 Fair value hedges: Terminated swaps on long-term debt $ — $ 1,504 Total derivatives designated as hedging instruments 7,912 11,290 — 12,124 9,004 1,504 Derivatives not designated as hedging instruments Interest rate swaps $ 1,096 $ — Interest rate swaps for customers 2 13,952 7,438 Futures contracts — 2 Foreign exchange 10,696 9,519 Total derivatives not designated as hedging instruments 25,744 16,959 Total derivatives $ 7,912 $ 11,290 $ 25,744 $ — $ 12,124 $ 9,004 $ 16,959 $ 1,504 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 $11.3 million for 2016 and $9.0 million for 2015 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	$ 213,528	$ 221,580	$ 265,059
Fair value of liabilities, Ending balance	0	0
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	7,549	1,480
Total net gains (losses) included in, Purchases	368
Total net gains (losses) included in, Redemptions and paydowns	(1,183)
Total net gains (losses) included, in Redemptions and paydowns, Liabilities		(1,186)
Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	0	4,164
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		(344)
Total net gains (losses) included in, Other comprehensive income (loss)		687
Total net gains (losses) included in, Sales		2,651
Total net gains (losses) included in, Redemptions and paydowns		(1,859)
Fair value of assets, Ending balance	0	0	4,164
Trust Preferred - Banks And Insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	0	393,007
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale		471
Total net gains (losses) included in, Fixed income securities gains (losses), net		(136,691)
Total net gains (losses) included in, Other comprehensive income (loss)		141,547
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
Total net gains (losses) included in, Redemptions and paydowns		(15,587)
Fair value of assets, Ending balance	0	0	393,007
Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	0
Fair value of assets, Ending balance		0
Other Asset-Backed [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	0	4,761
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)
Total net gains (losses) included in, Other comprehensive income (loss)		(74)
Total net gains (losses) included in, Sales		4,081
Total net gains (losses) included in, Redemptions and paydowns
Fair value of assets, Ending balance	0	0	4,761
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	120,027	97,649
Total net gains (losses) included in, Dividends and other investment income	(1,340)	(3,657)
Total net gains (losses) included in, Equity securities gains, net	5,325	7,270
Total net gains (losses) included in, Purchases	19,174	24,898
Total net gains (losses) included in, Sales	(3,673)	(4,107)
Total net gains (losses) included in, Redemptions and paydowns	(10,859)	(2,026)
Fair value of assets, Ending balance	128,654	120,027	97,649
Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total net gains (losses) included in, Purchases		993
Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	13,514	12,227
Total net gains (losses) included, in Redemptions and paydowns, Liabilities
Fair value of liabilities, Ending balance	20,248	13,514	12,227
Other Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	$ 0	(12)
Total net gains (losses) included in, Other noninterest expense		12
Fair value of liabilities, Ending balance		$ 0	$ (12)

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, 2016	Dec. 31, 2015
Dividends And Other Investment Income [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Realized gains (losses) from Level 3 inputs	$ 0	$ (2)
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	5,727	(11,311)
Fixed Income Securities Gains (Losses), Net [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Realized gains (losses) from Level 3 inputs	$ 0	$ (137,641)

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, 2016	Dec. 31, 2015
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Investment securities	$ 13,372,194	$ 7,643,116
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	$ 0

Fair Value (Schedule Of Asse127

Fair Value (Schedule Of Assets With Fair Value Changes On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount of other real estate owned property sold	$ 12,800	$ 19,200
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	51,842	10,991
Gains (losses) from fair value changes	(36,276)	(12,039)
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	1,297	10,707
Gains (losses) from fair value changes	(522)	(5,119)
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	871	2,388
Gains (losses) from fair value changes	(1,871)	(2,467)
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	54,010	24,086
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	(38,669)	(19,625)
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	51,842	10,991
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	871	2,388
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	52,713	13,379
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	1,297	10,707
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	$ 1,297	$ 10,707

Fair Value (Schedule Of Carryin

Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	$ 850,473	$ 552,088
Loans and Leases Receivable, Net Amount	42,081,743	40,043,494
Time deposits	2,756,810	2,130,680
Long-term debt (less fair value hedges)	534,850	812,366
Fair Value, Inputs, Level 2 [Member] | Carrying Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	867,904	545,648
Time deposits	2,756,810	2,130,680
Foreign deposits	0	294,391
Other Short-term Borrowings	500,000	0
Long-term debt (less fair value hedges)	534,850	812,366
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	850,473	552,088
Time deposits	2,743,885	2,129,742
Foreign deposits	0	294,321
Other Short-term Borrowings	500,000	0
Long-term debt (less fair value hedges)	551,881	838,796
Fair Value, Inputs, Level 3 [Member] | Carrying Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Net Amount	42,253,677	40,193,374
Fair Value, Inputs, Level 3 [Member] | Estimated Fair Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Net Amount	$ 42,110,544	$ 39,535,365

Operating Segment Information (

Operating Segment Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016USD ($)BranchesBanks	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2016USD ($)BranchesBanks	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Segment Reporting Information [Line Items]
Net interest income	$ 480,470	$ 469,187	$ 464,849	$ 452,842	$ 448,833	$ 425,377	$ 423,704	$ 417,346	$ 1,867,348	$ 1,715,260	$ 1,680,004
Provision for loan losses	(2,687)	18,825	34,492	42,145	22,701	18,262	566	(1,494)	92,775	40,035	(98,082)
Loans and Leases Receivable, Net of Deferred Income	42,649,265				40,649,542				42,649,265	40,649,542
Deposits	(53,235,830)				(50,374,091)				(53,235,830)	(50,374,091)
Carrying value, Preferred stock	709,601				828,490				709,601	828,490
Net interest income after provision for loan losses									1,774,573	1,675,225	1,778,086
Net impairment losses on investment securities									0	0	(27)
Noninterest Income									515,609	357,241	492,704
Noninterest expense	404,515	403,292	381,894	395,573	397,353	391,280	398,997	392,977	1,585,274	1,580,607	1,649,367
Income (loss) before income taxes	206,886	191,957	174,180	131,885	147,420	141,779	19,459	143,201	704,908	451,859	621,423
Income Tax Expense (Benefit)									235,858	142,388	222,961
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	137,401	$ 127,263	$ 113,949	$ 90,437	102,487	$ 100,999	$ 13,960	$ 92,025	469,050	309,471	398,462
Cash and due from banks	$ 737,327				798,319				$ 737,327	798,319	841,942	$ 1,173,057
Number of community/regional banks operating in distinct geographical areas | Banks	7								7
Total shareholders' equity	$ 7,634,306				7,507,519				$ 7,634,306	7,507,519	7,369,530	$ 6,464,563
Zions Bank [Member]
Segment Reporting Information [Line Items]
Net interest income									633,100	614,900	628,800
Provision for loan losses									(21,600)	(28,300)	(58,500)
Deposits	(16,764,000)				(16,233,000)				(16,764,000)	(16,233,000)	(16,214,000)
Net interest income after provision for loan losses									654,700	643,200	687,300
Noninterest Income									148,600	132,700	143,000
Noninterest expense									392,500	430,700	439,900
Income (loss) before income taxes									410,800	345,200	390,400
Average Loans	$ 12,560,000				12,232,000				$ 12,560,000	12,232,000	12,172,000
California Bank Trust [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	93								93
Amegy [Member]
Segment Reporting Information [Line Items]
Net interest income									$ 479,500	475,400	466,400
Provision for loan losses									163,000	91,300	32,200
Deposits	$ (11,924,000)				(11,677,000)				(11,924,000)	(11,677,000)	(11,491,000)
Net interest income after provision for loan losses									316,500	384,100	434,200
Noninterest Income									122,500	120,600	127,500
Noninterest expense									317,100	372,700	357,300
Income (loss) before income taxes									121,900	132,000	204,400
Average Loans	$ 10,557,000				10,115,000				$ 10,557,000	10,115,000	10,077,000
Number of Branches | Branches	74								74
California Bank And Trust [Member]
Segment Reporting Information [Line Items]
Net interest income									$ 450,000	425,600	444,100
Provision for loan losses									(9,100)	(4,400)	(20,100)
Deposits	$ (10,969,000)				(10,520,000)				(10,969,000)	(10,520,000)	(9,707,000)
Net interest income after provision for loan losses									459,100	430,000	464,200
Noninterest Income									67,200	63,400	60,600
Noninterest expense									268,200	294,200	321,300
Income (loss) before income taxes									258,100	199,200	203,500
Average Loans	9,381,000				8,832,000				9,381,000	8,832,000	8,530,000
NBA [Member]
Segment Reporting Information [Line Items]
Net interest income									196,700	181,800	181,100
Provision for loan losses									(3,100)	7,900	(21,500)
Deposits	(4,609,000)				(4,369,000)				(4,609,000)	(4,369,000)	(4,133,000)
Net interest income after provision for loan losses									199,800	173,900	202,600
Noninterest Income									39,700	36,100	33,500
Noninterest expense									129,900	132,700	145,100
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									109,600	77,300	91,000
Average Loans	$ 4,292,000				3,909,000				$ 4,292,000	3,909,000	3,750,000
Number of Branches | Branches	58								58
NSB [Member]
Segment Reporting Information [Line Items]
Net interest income									$ 124,800	125,300	125,400
Provision for loan losses									(28,400)	(28,300)	(20,900)
Deposits	$ (4,243,000)				(4,035,000)				(4,243,000)	(4,035,000)	(3,690,000)
Net interest income after provision for loan losses									153,200	153,600	146,300
Noninterest Income									39,400	36,300	34,900
Noninterest expense									123,500	131,300	132,700
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									69,100	58,600	48,500
Average Loans	$ 2,344,000				2,285,000				$ 2,344,000	2,285,000	2,421,000
Number of Branches | Branches	50								50
Vectra [Member]
Segment Reporting Information [Line Items]
Net interest income									$ 123,100	117,200	114,000
Provision for loan losses									(7,900)	4,700	(8,400)
Deposits	$ (2,842,000)				(2,889,000)				(2,842,000)	(2,889,000)	(2,591,000)
Net interest income after provision for loan losses									131,000	112,500	122,400
Noninterest Income									22,800	21,300	22,300
Noninterest expense									87,300	97,600	98,300
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									66,500	36,200	46,400
Average Loans	2,528,000				2,468,000				2,528,000	2,468,000	2,320,000
TCBW [Member]
Segment Reporting Information [Line Items]
Net interest income									39,500	34,600	34,600
Provision for loan losses									(200)	(2,900)	(900)
Deposits	(1,161,000)				(986,000)				(1,161,000)	(986,000)	(816,000)
Net interest income after provision for loan losses									39,700	37,500	35,500
Noninterest Income									4,600	4,100	4,100
Noninterest expense									18,600	16,500	33,400
Income (loss) before income taxes									25,700	25,100	6,200
Average Loans	$ 870,000				704,000				$ 870,000	704,000	713,000
Number of Branches | Branches	1								1
Consolidated Company [Member]
Segment Reporting Information [Line Items]
Net interest income									$ 1,867,400	1,715,300	1,680,000
Provision for loan losses									92,800	40,000	(98,100)
Deposits	$ (53,236,000)				(50,374,000)				(53,236,000)	(50,374,000)	(47,848,000)
Net interest income after provision for loan losses									1,774,600	1,675,300	1,778,100
Noninterest Income									515,600	357,200	492,700
Noninterest expense									1,585,300	1,580,600	1,649,400
Income (loss) before income taxes									704,900	451,900	621,400
Average Loans	$ 42,649,000				40,650,000				$ 42,649,000	40,650,000	40,064,000
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	98								98
Idaho [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	23								23
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
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net interest income									$ (179,300)	(259,500)	(314,400)
Provision for loan losses									100	0	0
Deposits	$ (724,000)				(335,000)				(724,000)	(335,000)	(794,000)
Net interest income after provision for loan losses									(179,400)	(259,500)	(314,400)
Noninterest Income									70,800	57,300	66,800
Noninterest expense									248,200	104,900	121,400
Income (loss) before income taxes									(356,800)	(421,700)	(369,000)
Average Loans	$ 117,000				$ 105,000				$ 117,000	$ 105,000	$ 81,000

Quarterly Financial Informat130

Quarterly Financial Information (Financial Information By Quarter) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Gross interest income	$ 501,766	$ 490,695	$ 486,952	$ 474,901	$ 473,559	$ 456,230	$ 455,236	$ 448,446	$ 1,954,314	$ 1,833,471	$ 1,853,002
Net interest income	480,470	469,187	464,849	452,842	448,833	425,377	423,704	417,346	1,867,348	1,715,260	1,680,004
Provision for loan losses	(2,687)	18,825	34,492	42,145	22,701	18,262	566	(1,494)	92,775	40,035	(98,082)
Net impairment losses on investment securities									0	0	(27)
Investment securities gains (losses), net	(3,422)	8,480	2,734	(522)	46	3,577	(133,597)	3,114	7,270	(126,860)
Other noninterest income	131,666	136,407	122,983	117,283	118,595	122,367	128,915	114,224	508,339	484,101
Noninterest expense	404,515	403,292	381,894	395,573	397,353	391,280	398,997	392,977	1,585,274	1,580,607	1,649,367
Income before income taxes	206,886	191,957	174,180	131,885	147,420	141,779	19,459	143,201	704,908	451,859	621,423
Net income (loss)	137,401	127,263	113,949	90,437	102,487	100,999	13,960	92,025	469,050	309,471	398,462
Preferred stock dividends	(12,411)	(10,368)	(13,543)	(11,660)	(14,290)	(16,761)	(15,060)	(16,746)	(47,982)	(62,857)	(71,894)
Preferred stock redemption	0	0	(9,759)	0					(9,759)	0	0
Net earnings applicable to common shareholders	$ 124,990	$ 116,895	$ 90,647	$ 78,777	$ 88,197	$ 84,238	$ (1,100)	$ 75,279	$ 411,309	$ 246,614	$ 326,568
Basic, per share	$ 0.61	$ 0.57	$ 0.44	$ 0.38	$ 0.43	$ 0.41	$ (0.01)	$ 0.37	$ 2	$ 1.20	$ 1.68
Diluted	$ 0.60	$ 0.57	$ 0.44	$ 0.38	$ 0.43	$ 0.41	$ (0.01)	$ 0.37	$ 1.99	$ 1.20	$ 1.68

Parent Company Financial Inf131

Parent Company Financial Information (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Held-to-maturity, fair value	$ 850,473	$ 552,088
Cash and due from banks	737,327	798,319	$ 841,942	$ 1,173,057
Interest-bearing deposits	1,410,852	6,108,124
Held-to-maturity Securities	867,904	545,648
Available-for-sale, at fair value	13,372,194	7,643,116
Other noninterest-bearing investments	884,407	848,144
Other assets	983,355	916,937
Total assets	63,239,165	59,664,543
Other liabilities	941,999	548,742
Long-term debt	534,850	812,366
Total liabilities	55,604,859	52,157,024
Preferred stock	709,601	828,490
Common Stock	4,724,715	4,766,731
Retained earnings	2,321,571	1,966,910
Accumulated Other Comprehensive Income (Loss), Net of Tax	(121,581)	(54,612)	(128,041)
Total shareholders' equity	7,634,306	7,507,519	7,369,530	6,464,563
Total liabilities and shareholders' equity	63,239,165	59,664,543
Allowance for loan losses	567,522	606,048	604,663
Parent Company [Member]
Cash and due from banks	2,023	18,375	$ 23,774	$ 903,078
Interest-bearing deposits	528,531	775,649
Security Resell Agreements Amount Outstanding	0	100,000
Available-for-sale, at fair value	40,258	45,168
Other noninterest-bearing investments	28,719	28,178
Receivables From Subsidiaries, Others	0	60
Other assets	80,715	78,728
Total assets	8,256,893	8,442,822
Other liabilities	88,477	123,849
Subordinated debt to affiliated trusts	0	164,950
Total liabilities	622,587	935,303
Preferred stock	709,601	828,490
Common Stock	4,724,715	4,766,731
Retained earnings	2,321,571	1,966,910
Accumulated Other Comprehensive Income (Loss), Net of Tax	(121,581)	(54,612)
Total shareholders' equity	7,634,306	7,507,519
Total liabilities and shareholders' equity	8,256,893	8,442,822
Parent Company [Member] | Due To Others [Member]
Long-term debt	534,110	646,504
Parent Company [Member] | Other Operating Companies [Member]
Investments in subsidiaries	6,126	84,010
Parent Company [Member] | Commercial Banks And Bank Holding Company [Member]
Investments in subsidiaries	$ 7,570,521	$ 7,312,654

Parent Company Financial Inf132

Parent Company Financial Information (Condensed Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other loans and securities									$ 1,728,706	$ 1,686,220	$ 1,729,652
Total interest income	$ 501,766	$ 490,695	$ 486,952	$ 474,901	$ 473,559	$ 456,230	$ 455,236	$ 448,446	1,954,314	1,833,471	1,853,002
Total interest expense									86,966	118,211	172,998
Net interest loss	(480,470)	(469,187)	(464,849)	(452,842)	(448,833)	(425,377)	(423,704)	(417,346)	(1,867,348)	(1,715,260)	(1,680,004)
Provision for loan losses	2,687	(18,825)	(34,492)	(42,145)	(22,701)	(18,262)	(566)	1,494	(92,775)	(40,035)	98,082
Net interest loss after provision for loan losses									1,774,573	1,675,225	1,778,086
Net impairment losses on investment securities									0	0	(27)
Other income (loss)									(8,616)	(11,094)	(7,914)
Total noninterest income									515,609	357,241	492,704
Salaries and employee benefits									982,531	972,712	956,411
Total noninterest expense	404,515	403,292	381,894	395,573	397,353	391,280	398,997	392,977	1,585,274	1,580,607	1,649,367
Income taxes (benefit)									235,858	142,388	222,961
Preferred stock dividends	(12,411)	(10,368)	(13,543)	(11,660)	(14,290)	(16,761)	(15,060)	(16,746)	(47,982)	(62,857)	(71,894)
Net earnings applicable to common shareholders	$ 124,990	$ 116,895	$ 90,647	$ 78,777	$ 88,197	$ 84,238	$ (1,100)	$ 75,279	411,309	246,614	326,568
Parent Company [Member]
Commercial bank subsidiaries									559	1,162	1,489
Other subsidiaries and affiliates									3	3	16
Other loans and securities									2,015	3,014	10,900
Total interest income									2,577	4,179	12,405
Affiliated trusts									3,484	4,308	4,265
Other borrowed funds									33,651	63,665	117,700
Total interest expense									37,135	67,973	121,965
Net interest loss									34,558	63,794	109,560
Provision for loan losses									0	0	0
Net interest loss after provision for loan losses									(34,558)	(63,794)	(109,560)
Equity and fixed income securities gains (losses), net									0	37,161	300,275
Net impairment losses on investment securities									0	0	0
Other income (loss)									(4,490)	(12,512)	(6,475)
Total noninterest income									267,639	283,626	543,162
Salaries and employee benefits									22,868	24,674	17,457
Extinguishment of Debt, Amount									353	135	44,422
Other operating expenses									(13,543)	(10,473)	(10,559)
Total noninterest expense									9,678	35,282	72,438
Income (loss) before income taxes and undistributed income (loss) of consolidated subsidiaries									223,403	184,550	361,164
Income taxes (benefit)									(19,006)	(27,140)	55,865
Income before equity in undistributed income (loss) of consolidated subsidiaries									242,409	211,690	305,299
Net Income (Loss) Attributable to Parent									469,050	309,471	398,462
Preferred stock dividends									(47,982)	(62,857)	(71,894)
Preferred stock redemption									(9,759)	0	0
Net earnings applicable to common shareholders									411,309	246,614	326,568
Parent Company [Member] | Other Operating Companies [Member]
Dividends from consolidated subsidiaries									0	100	400
Equity in undistributed income (loss) of consolidated subsidiaries									(3,526)	(10,569)	(4,510)
Parent Company [Member] | Commercial Banks And Bank Holding Company [Member]
Dividends from consolidated subsidiaries									263,149	233,853	236,012
Equity in undistributed income (loss) of consolidated subsidiaries									$ 230,167	$ 108,350	$ 97,673

Parent Company Financial Inf133

Parent Company Financial Information (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net cash used in operating activities	$ 596,067	$ 464,352	$ 380,341
Other, net	(14,243)	48,919	34,916
Net cash provided by (used in) investing activities	(3,436,254)	(2,579,901)	(1,268,562)
Net change in short-term funds borrowed	480,282	102,764	(96,125)
Repayments of long-term debt	(280,120)	(287,752)	(1,223,275)
Debt Extinguishment Costs Paid	(353)	(2,530)	(35,435)
Payments for Repurchase of Common Stock	(97,240)	(6,681)	(5,589)
Other, net	2,227	1,441	2,030
Net cash provided by (used in) financing activities	2,779,195	2,071,926	557,106
Net increase (decrease) in cash and due from banks	(60,992)	(43,623)	(331,115)
Cash and Due From Banks - Beginning of Year	737,327	798,319	841,942	$ 1,173,057
Interest paid	83,338	101,623	152,783
Other Noncash Income (Expense)	3,352	(19,712)	(23,287)
Parent Company [Member]
Net income (loss) applicable to controlling interest	469,050	309,471	398,462
Undistributed net losses (income) of consolidated subsidiaries	(226,641)	(97,781)	(93,163)
Net cash used in operating activities	211,714	290,405	499,001
Net decrease (increase) in interest-bearing deposits	347,118	132,267	(1,007,844)
Collection of advances to subsidiaries	60	56,000	15,000
Advances to subsidiaries	0	(41,000)	(30,060)
Proceeds from Sale and Maturity of Marketable Securities	3,878	124,419	372,357
Purchases of investment securities	0	(46,851)	0
Decrease (increase) of investment in subsidiaries	0	15,000	6,310
Other, net	7,342	4,010	24,319
Net cash provided by (used in) investing activities	358,398	243,845	(619,918)
Repayments of long-term debt	(279,948)	(271,120)	(1,147,641)
Debt Extinguishment Costs Paid	(353)	(135)	(35,435)
Proceeds from issuance of common stock and warrants	25,072	22,392	526,438
Cash paid for preferred stock redemption	(126,144)	(175,669)	0
Payments for Repurchase of Common Stock	(97,240)	(6,681)	(5,589)
Dividends paid on preferred stock	(50,098)	(62,857)	(64,868)
Dividends paid on common stock	57,753	45,198	31,262
Other, net	0	(381)	(30)
Net cash provided by (used in) financing activities	(586,464)	(539,649)	(758,387)
Net increase (decrease) in cash and due from banks	(16,352)	(5,399)	(879,304)
Cash and Due From Banks - Beginning of Year	2,023	18,375	23,774	$ 903,078
Interest paid	35,000	51,400	100,600
Extinguishment of Debt, Amount	353	135	44,422
Other Noncash Income (Expense)	$ (31,048)	$ 78,580	$ 149,280