Zions Bancorporation, National Association (ZION) 10-Q 7 May 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	zion
Entity Registrant Name	ZIONS BANCORPORATION /UT/
Entity Central Index Key	109380
Current Fiscal Year End Date	-28
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		203,209,100

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
ASSETS
Cash and due from banks	$720,858	$841,942
Money market investments:
Interest-bearing deposits	6,791,762	7,178,097
Federal funds sold and security resell agreements	1,519,352	1,386,291
Investment securities:
Held-to-maturity, at adjusted cost (approximate fair value $602,355 and $677,196)	590,950	647,252
Available-for-sale, at fair value	4,450,502	3,844,248
Trading account, at fair value	71,392	70,601
Marketable securities, total	5,112,844	4,562,101
Loans held for sale	128,946	132,504
Loans and leases, net of unearned income and fees:
Loans and leases receivable, net of unearned income and fees	40,180,114	40,063,658
Less allowance for loan losses	620,013	604,663
Loans, net of allowance	39,560,101	39,458,995
Other noninterest-bearing investments	870,125	865,950
Premises and equipment, net	844,900	829,809
Goodwill	1,014,129	1,014,129
Core deposit and other intangibles	23,162	25,520
Other real estate owned	17,256	18,916
Other assets	952,496	894,620
Total assets	57,555,931	57,208,874
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing demand	20,854,630	20,529,124
Interest-bearing:
Savings and money market	24,540,927	24,583,636
Time	2,344,818	2,406,924
Foreign	382,985	328,391
Total deposits	48,123,360	47,848,075
Federal funds and other short-term borrowings	203,597	244,223
Long-term debt	1,089,321	1,092,282
Reserve for unfunded lending commitments	82,287	81,076
Other liabilities	603,068	573,688
Total liabilities	50,101,633	49,839,344
Shareholders' equity:
Preferred stock, without par value, authorized 4,400,000 shares	1,004,032	1,004,011
Common stock, without par value; authorized 350,000,000 shares; issued and outstanding 203,192,991 and 203,014,903 shares	4,728,556	4,723,855
Retained earnings	1,836,619	1,769,705
Accumulated other comprehensive income (loss)	-114,909	-128,041
Total shareholders' equity	7,454,298	7,369,530
Total liabilities and shareholders' equity	$57,555,931	$57,208,874

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Held-to-maturity, fair value	$602,355	$677,196
Preferred stock, authorized shares	4,400,000	4,400,000
Common stock, authorized shares	350,000,000	350,000,000
Common stock, issued shares	203,192,991	203,014,903
Common stock, outstanding shares	203,192,991	203,014,903

Consolidated_Statements_Of_Inc

Consolidated Statements Of Income (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Interest and fees on loans	$415,755	$434,350
Interest on money market investments	5,218	5,130
Interest on Securities	27,473	28,094
Interest expense:
Interest on deposits	12,104	12,779
Interest on short- and long-term borrowings	18,996	38,324
Total interest expense	31,100	51,103
Net interest income	417,346	416,471
Provision for loan losses	-1,494	-610
Net interest income after provision for loan losses	418,840	417,081
Noninterest income:
Service charges and fees on deposit accounts	41,194	41,199
Other service charges, commissions and fees	47,486	44,250
Wealth management income	7,615	7,077
Gain Loss On Sales Of Loans And Servicing Income	7,706	7,096
Capital markets and foreign exchange	5,501	5,043
Dividends and other investment income	9,372	7,864
Fair value and nonhedge derivative income (loss)	-1,088	-8,539
Equity securities gains, net	3,353	912
Fixed income securities gains (losses), net	-239	30,914
Impairment losses on investment securities:
Impairment losses on investment securities	0	-27
Non-credit losses on secutities not expectd to be sold (recognized in other comprehensive income)	0	0
Net impairment losses on investment securities	0	-27
Other	922	2,524
Total noninterest income	121,822	138,313
Noninterest expense:
Salaries and employee benefits	243,519	233,402
Occupancy, net	29,339	28,305
Furniture, equipment and software	29,713	27,944
Other real estate expense	374	1,607
Credit-related expense	5,939	6,947
Provision for unfunded lending commitments	1,211	-1,012
Professional and legal services	11,483	10,995
Advertising	6,975	6,398
FDIC premiums	8,119	7,922
Amortization of core deposit and other intangibles	2,358	2,882
Other	58,431	72,673
Total noninterest expense	397,461	398,063
Income before income taxes	143,201	157,331
Income taxes	51,176	56,121
Net income	92,025	101,210
Preferred stock dividends	-16,746	-25,020
Net earnings applicable to common shareholders	75,279	76,190
Weighted average common shares outstanding during the period:
Basic shares	202,603	184,440
Diluted shares	202,944	185,123
Net earnings per common share:
Basic	$0.37	$0.41
Diluted	$0.37	$0.41
Interest and Dividend Income, Operating	$448,446	$467,574

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net income	$92,025	$101,210
Other comprehensive income (loss), net of tax:
Unrealized holding gains (losses) on investment securities	486	73,907
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	10,938	0
Reclassification to earnings for realized net fixed income securities losses (gains)	148	-24,840
Reclassification to earnings for net credit-related impairment losses on investment securities	0	17
Accretion of securities with noncredit-related impairment losses not expected to be sold	0	286
Net unrealized holding gains (losses) on derivative instruments	2,553	320
Net unrealized gains (losses) on other noninterest-bearing investments	-364	-2,841
Reclassification adjustment for increase in interest income recognized in earnings on derivatives instruments	-629	-210
Other comprehensive income (loss)	13,132	46,639
Comprehensive income applicable to controlling interest	$105,157	$147,849

Consolidated_Statements_Of_Cha

Consolidated Statements Of Changes In Shareholders' Equity (USD $)	Total	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
In Thousands, except Share data, unless otherwise specified
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) for the period	101,210			101,210
Other comprehensive income, net of tax	46,639				46,639
Net activity under employee plans and related tax benefits, shares			217,486
Net activity under employee plans and related tax benefits	6,489		6,489
Dividends on preferred stock	-25,020			-25,020
Dividends on common stock	-7,436			-7,436
Change in deferred compensation	-229			-229
Balance at Mar. 31, 2014	6,586,216	1,003,970	4,185,513	1,542,195	-145,462
Balance (in shares) at Mar. 31, 2014			184,895,182
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		203,014,903
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) for the period	92,025			92,025
Other comprehensive income, net of tax	13,132				13,132
Subordinated debt converted to preferred stock	15	21	-6
Net activity under employee plans and related tax benefits, shares			178,088
Net activity under employee plans and related tax benefits	4,707		4,707
Dividends on preferred stock	-16,746			-16,746
Dividends on common stock	-8,176			-8,176
Change in deferred compensation	-189			-189
Balance at Mar. 31, 2015	$7,454,298	$1,004,032	$4,728,556	$1,836,619	($114,909)
Balance (in shares) at Mar. 31, 2015	203,192,991		203,192,991

Consolidated_Statements_Of_Cha1

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Dividends on common stock, per share	$0.04	$0.04

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	$92,025	$101,210
Adjustments to reconcile net income to net cash provided by operating activities:
Net impairment losses on investment securities	0	27
Provision for credit losses	-283	-1,622
Depreciation and amortization	34,169	32,404
Fixed income securities losses (gains), net	239	-30,914
Deferred income tax expense (benefit)	3,402	78,278
Net decrease (increase) in trading securities	-1,021	-21,862
Net decrease in loans held for sale	3,517	44,984
Change in other liabilities	25,566	-77,796
Change in other assets	-65,248	3,226
Other, net	-3,549	2,336
Net cash provided by operating activities	88,817	130,271
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	253,274	-80,851
Proceeds from maturities and paydowns of investment securities held-to-maturity	39,323	18,935
Purchases of investment securities held-to-maturity	-22,576	-35,750
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	228,894	847,288
Purchases of investment securities available-for-sale	-784,856	-452,123
Change in loans and leases	100,442	166,415
Net purchases of premises and equipment	-33,533	-76,916
Proceeds from sales of other real estate owned	3,401	11,825
Other, net	3,351	5,617
Net cash provided by (used in) investing activities	-413,164	71,610
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	275,285	170,422
Net change in short-term funds borrowed	-40,626	-60,511
Repayments of long-term debt	-8,185	-124,755
Proceeds from issuances of common stock	962	2,880
Dividends paid on common and preferred stock	-23,234	-23,741
Other, net	-939	-303
Net cash provided by (used in) financing activities	203,263	-36,008
Net increase (decrease) in cash and due from banks	-121,084	165,873
Cash and due from banks at beginning of period	841,942	1,173,057
Cash and due from banks at end of period	720,858	1,338,930
Cash paid for interest	22,119	40,849
Net cash paid for income taxes	($500)	($81)

Basis_of_Presentaion

Basis of Presentaion	3 Months Ended
	Mar. 31, 2015
Basis Of Presentation [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	BASIS OF PRESENTATION
	The accompanying unaudited consolidated financial statements of Zions Bancorporation (“the Parent”) and its majority-owned subsidiaries (collectively “the Company,” “Zions,” “we,” “our,” “us”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board (“FASB”) are made according to sections of the Accounting Standards Codification (“ASC”) and to Accounting Standards Updates (“ASU”), which include consensus issues of the Emerging Issues Task Force (“EITF”). In certain cases, ASUs are issued jointly with International Financial Reporting Standards (“IFRS”). Certain prior period amounts have been reclassified to conform with the current period presentation. These reclassifications did not affect net income.
	Operating results for the three months ended March 31, 2015 and 2014 are not necessarily indicative of the results that may be expected in future periods. The consolidated balance sheet at December 31, 2014 is from the audited financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s 2014 Annual Report on Form 10-K.
	The Company provides a full range of banking and related services through subsidiary banks in 11 Western and Southwestern states as follows: Zions First National Bank (“Zions Bank”), in Utah, Idaho and Wyoming; California Bank & Trust (“CB&T”); Amegy Corporation (“Amegy”) and its subsidiary, Amegy Bank, in Texas; National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“Vectra”), in Colorado and New Mexico; The Commerce Bank of Washington (“TCBW”); and The Commerce Bank of Oregon (“TCBO”). Effective April 1, 2015, TCBO was merged into TCBW. The Parent and its subsidiary banks also own and operate certain nonbank subsidiaries that engage in financial services.

Certain_Recent_Accounting_Pron

Certain Recent Accounting Pronouncements (Notes)	3 Months Ended
	Mar. 31, 2015
Certain Recent Accounting Pronouncements [Abstract]
Certain Recent Accounting Pronouncements [Text Block]
	2	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 2015-05, Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement (Subtopic 350-40)		The standard provides guidance to determine whether an arrangement includes a software license. If it does, the customer accounts for it the same way as for other software licenses. If no software license is included, the customer accounts for it as a service contract. Adoption may be retrospective or prospective. Early adoption is permitted.	1-Jan-16	We are currently evaluating the impact this new guidance may have on the Company’s financial statements.
	ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs (Subtopic 835-30)		The standard requires that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of the associated debt liability, consistent with debt discounts. Adoption is retrospective and early adoption is permitted.	1-Jan-16	We currently include debt issuance costs in other assets. The amount to be reclassified to the debt liability is not material to the Company’s financial statements.
	Standard		Description	Date of adoption	Effect on the financial statements or other significant matters
	Standards not yet adopted by the Company (continued)
	ASU 2015-02, Amendments to the Consolidation Analysis (Topic 810)		The new standard changes certain criteria in the variable interest model and the voting model to determine whether certain legal entities are variable interest entities (“VIEs”) and whether they should be consolidated. Additional disclosures are required regarding entities not currently considered VIEs, but may become VIEs under the new guidance and may be subject to consolidation. Adoption may be retrospective or modified retrospective with a cumulative effect adjustment. Early adoption is permitted.	1-Jan-16	We currently do not consolidate any VIEs and do not expect this new guidance will have a material impact on the Company’s financial statements.
	ASU 2014-09, Revenue from Contracts with Customers (Topic 606)		The core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The banking industry does not expect significant changes because major sources of revenue are from financial instruments that have been excluded from the scope of the new standard, (including loans, derivatives, debt and equity securities, etc.). However, the new standard affects other fees charged by banks, such as asset management fees, credit card interchange fees, deposit account fees, etc. Adoption may be made on a full retrospective basis with practical expedients, or on a modified retrospective basis with a cumulative effect adjustment. Early adoption is not permitted.	January 1, 2017 (FASB voted on April 1, 2015 to propose to defer effective date by one year from the above date).	While we currently do not expect this standard will have a significant impact on the Company’s financial statements, we are still in process of conducting our evaluation.
	Standards adopted by the Company
	ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure (Subtopic 310-40)		The standard addresses the classification of certain foreclosed mortgage loans fully or partially guaranteed under government programs. Under certain such programs, qualifying creditors can extend mortgage loans with a guarantee entitling the creditor to recover all or a portion of the unpaid principal balance from the government if the borrower defaults. A separate other receivable is established that is measured based on the amount of the loans expected to be recovered.	1-Jan-15	Our adoption of this standard had no impact on the accompanying financial statements.
	ASU 2014-04, Reclassification of Residential Real Estate Collateralized		The standard clarifies that a creditor should be considered to have physical possession of a residential real estate property collateralizing a residential mortgage loan and thus would reclassify the loan to other real estate owned when certain conditions are satisfied. Additional financial statement disclosures will be required.	1-Jan-15	Our adoption of this standard added a nominal amount of additional disclosure to Note 6.
	Consumer Mortgage Loans upon Foreclosure (Subtopic 310-40)
	ASU 2014-01, Accounting for Investments in Qualified Affordable Housing		The standard revised conditions an entity must meet to elect the effective yield method when accounting for qualified affordable housing project investments. The EITF final consensus changed the method of amortizing a Low-Income Housing Tax Credit (“LIHTC”) investment from the effective yield method to a proportional amorti-zation method. Amortization would be proportional to the tax credits and tax benefits received but, under a practical expedient available in certain circumstances, amortization could be proportional to only the tax credits. Reporting entities that invest in LIHTC investments through a limited liability entity could elect the proportional amortization method if certain conditions are met.	1-Jan-15	Our adoption of this standard did not have a significant effect on the accompanying financial statements.
	Projects (Topic 323)

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	3 Months Ended
	Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]
Cash Flow, Supplemental Disclosures [Text Block]
	.	SUPPLEMENTAL CASH FLOW INFORMATION
	Noncash activities are summarized as follows:
	(In thousands)	Three Months Ended
		March 31,
		2015		2014
	Loans and leases transferred to other real estate owned	$	3,568	$	6,338
	Loans held for sale reclassified as loans and leases	13,138		3,789
	Amortized cost of HTM securities reclassified as AFS securities	79,276		—

Offsetting_Assets_and_Liabilit

Offsetting Assets and Liabilities (Notes)	3 Months Ended
	Mar. 31, 2015
Offsetting Assets and Liabilities [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:
			March 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		$	1,519,352	$	—	$	1,519,352	$	—		$	—		$	1,519,352
	Derivatives (included in other assets)		83,978		—		83,978		(5,121		)	—			78,857
			$	1,603,330	$	—	$	1,603,330	$	(5,121	)	$	—		$	1,598,209
	Liabilities:
	Federal funds and other short-term borrowings		$	203,597	$	—	$	203,597	$	—		$	—		$	203,597
	Derivatives (included in other liabilities)		81,123		—		81,123		(5,121		)	(38,833		)	37,169
			$	284,720	$	—	$	284,720	$	(5,121	)	$	(38,833	)	$	240,766
			December 31, 2014
	(In thousands)								Gross amounts not offset in the balance sheet
	Description		Gross amounts recognized		Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
	Assets:
	Federal funds sold and security resell agreements		$	1,386,291	$	—	$	1,386,291	$	—		$	—		$	1,386,291
	Derivatives (included in other assets)		66,420		—		66,420		(3,755		)				62,665
			$	1,452,711	$	—	$	1,452,711	$	(3,755	)	$	—		$	1,448,956
	Liabilities:
	Federal funds and other short-term borrowings		$	244,223	$	—	$	244,223	$	—		$	—		$	244,223
	Derivatives (included in other liabilities)		66,064		—		66,064		(3,755		)	(31,968		)	30,341
			$	310,287	$	—	$	310,287	$	(3,755	)	$	(31,968	)	$	274,564
	Security resell and repurchase 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	3 Months Ended
	Mar. 31, 2015
Investments [Abstract]
Investment Securities	INVESTMENTS
	Investment Securities
	Investment securities are summarized below. Note 10 discusses the process to estimate fair value for investment securities.
		March 31, 2015
	(In thousands)	Amortized			Gross				Gross			Estimated fair
		cost			unrealized				unrealized			value
					gains				losses
	Held-to-maturity
	Municipal securities	$	590,950		$	12,208			$	803		$	602,355
	Available-for-sale
	U.S. Government agencies and corporations:
	Agency securities	631,603			1,406				7,139			625,870
	Agency guaranteed mortgage-backed securities	1,417,843			16,441				614			1,433,670
	Small Business Administration loan-backed securities	1,588,562			15,677				8,558			1,595,681
	Municipal securities	175,017			1,282				689			175,610
	Asset-backed securities:
	Trust preferred securities – banks and insurance	611,836			99				150,418			461,517
	Other	5,229			235				—			5,464
		4,430,090			35,140				167,418			4,297,812
	Mutual funds and other	153,235			101				646			152,690
		4,583,325			35,241				168,064			4,450,502
	Total	$	5,174,275		$	47,449			$	168,867		$	5,052,857
		December 31, 2014
					Recognized in OCI 1											Not recognized in OCI
	(In thousands)	Amortized			Gross				Gross			Carrying				Gross			Gross			Estimated
		cost			unrealized				unrealized			value				unrealized			unrealized			fair
					gains				losses							gains			losses			value
	Held-to-maturity
	Municipal securities	$	607,675		$	—			$	—		$	607,675			$	13,018		$	804		$	619,889
	Asset-backed securities:
	Trust preferred securities – banks and insurance	79,276			—				39,699			39,577				18,393			663			57,307
		686,951			—				39,699			647,252				31,411			1,467			677,196
	Available-for-sale
	U.S. Government agencies and
	corporations:
	Agency securities	607,523			1,572				8,343			600,752										600,752
	Agency guaranteed mortgage-backed securities	935,164			12,132				2,105			945,191										945,191
	Small Business Administration loan-backed securities	1,544,710			16,446				8,891			1,552,265										1,552,265
	Municipal securities	189,059			1,143				945			189,257										189,257
	Asset-backed securities:
	Trust preferred securities – banks and insurance	537,589			103				121,984			415,708										415,708
	Other	5,252			207				7			5,452										5,452
		3,819,297			31,603				142,275			3,708,625										3,708,625
	Mutual funds and other	136,591			76				1,044			135,623										135,623
		3,955,888			31,679				143,319			3,844,248										3,844,248
	Total	$	4,642,839		$	31,679			$	183,018		$	4,491,500									$	4,521,444
	1	Other comprehensive income
	During the first quarter of 2015, we reclassified all of the remaining held-to-maturity (“HTM”) collateralized debt obligation (“CDO”) securities, or approximately $79 million at amortized cost, to available-for-sale (“AFS”) securities. The reclassification reduced existing unrealized losses in OCI of $40 million on HTM securities by approximately $18 million pretax. These existing unrealized losses resulted from a previous reclassification of AFS securities to HTM, and from OTTI. We took this action as a result of the most recent Dodd-Frank Act stress test results and the treatment of the CDO securities under the new Basel III capital and risk weighting rules that became effective January 1, 2015. The reclassification provides the Company with greater flexibility in the management of these securities. Current accounting guidance allows for the reclassification of HTM to AFS securities, without calling into question the entity’s intent to hold other debt securities to maturity, when there has been a significant increase in the risk weights of debt securities used for regulatory risk-based capital purposes. No gain or loss was recognized in the statement of income at the time of reclassification.
	The amortized cost and estimated fair value of investment debt securities are shown subsequently as of March 31, 2015 by contractual maturity, except for CDOs, Small Business Administration (“SBA”) loan-backed securities, agency guaranteed mortgage-backed securities, and certain agency and municipal securities, where expected maturity is used. Actual maturities may differ from contractual or expected maturities 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			Estimated				Amortized			Estimated
		cost			fair				cost			fair
					value							value
	Due in one year or less	$	96,220		$	97,409			$	639,077		$	638,407
	Due after one year through five years	188,507			191,799				1,719,501			1,718,550
	Due after five years through ten years	158,244			164,415				1,155,325			1,146,764
	Due after ten years	147,979			148,732				916,187			794,091
		$	590,950		$	602,355			$	4,430,090		$	4,297,812
	The following is a summary of the amount of gross unrealized losses for investment securities and the estimated fair value by length of time the securities have been in an unrealized loss position:
		March 31, 2015
		Less than 12 months							12 months or more							Total
	(In thousands)	Gross			Estimated				Gross			Estimated				Gross			Estimated
		unrealized			fair				unrealized			fair				unrealized			fair
		losses			value				losses			value				losses			value
Held-to-maturity
Municipal securities	$	722		$	93,203			$	81		$	3,831			$	803		$	97,034
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	2,631			139,038				4,508			287,134				7,139			426,172
Agency guaranteed mortgage-backed securities	438			178,832				176			12,750				614			191,582
Small Business Administration loan-backed securities	4,551			460,629				4,007			264,312				8,558			724,941
Municipal securities	129			28,134				560			2,916				689			31,050
Asset-backed securities:
Trust preferred securities – banks and insurance	—			—				150,418			446,038				150,418			446,038
	7,749			806,633				159,669			1,013,150				167,418			1,819,783
Mutual funds and other	646			72,296				—			—				646			72,296
	8,395			878,929				159,669			1,013,150				168,064			1,892,079
Total	$	9,117		$	972,132			$	159,750		$	1,016,981			$	168,867		$	1,989,113
		December 31, 2014
		Less than 12 months							12 months or more							Total
	(In thousands)	Gross			Estimated				Gross			Estimated				Gross			Estimated
		unrealized			fair				unrealized			fair				unrealized			fair
		losses			value				losses			value				losses			value
	Held-to-maturity
	Municipal securities	$	527		$	62,762			$	277		$	14,003			$	804		$	76,765
	Asset-backed securities:
	Trust preferred securities – banks and insurance	53			122				40,309			57,186				40,362			57,308
		580			62,884				40,586			71,189				41,166			134,073
	Available-for-sale
	U.S. Government agencies and corporations:
	Agency securities	4,510			295,694				3,833			101,188				8,343			396,882
	Agency guaranteed mortgage-backed securities	1,914			425,114				191			12,124				2,105			437,238
	Small Business Administration loan-backed securities	5,869			495,817				3,022			175,523				8,891			671,340
	Municipal securities	258			36,551				687			4,616				945			41,167
	Asset-backed securities:
	Trust preferred securities – banks and insurance	—			—				121,984			405,605				121,984			405,605
	Other	7			1,607				—			—				7			1,607
		12,558			1,254,783				129,717			699,056				142,275			1,953,839
	Mutual funds and other	1,044			71,907				—			—				1,044			71,907
		13,602			1,326,690				129,717			699,056				143,319			2,025,746
	Total	$	14,182		$	1,389,574			$	170,303		$	770,245			$	184,485		$	2,159,819
At March 31, 2015 and December 31, 2014, respectively, 188 and 153 HTM and 433 and 458 AFS investment securities were in an unrealized loss position.
Other-Than-Temporary Impairment
Ongoing Policy
We conduct a formal review of investment securities on a quarterly basis for the presence of other-than-temporary impairment (“OTTI”). We assess whether OTTI is present when the fair value of a debt security is less than its amortized cost basis at the balance sheet date (the vast 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.
CDO Sales and Paydowns
During the first quarter of 2015, sales, paydowns and payoffs of CDO securities, along with net gains/losses, were not significant. During the first quarter of 2014, we recorded a total of $993 million par amount of sales and paydowns of CDO securities, resulting in net gains of approximately $31 million. These sales were made in part as a result of the Volcker Rule.
OTTI Conclusions
Our 2014 Annual Report on Form 10-K describes in more detail our OTTI evaluation process. The following summarizes the conclusions from our OTTI evaluation by each security type that has significant gross unrealized losses at March 31, 2015:
OTTI – Asset-Backed Securities
Trust preferred securities – banks and insurance: These CDO securities are interests in variable rate pools of trust preferred securities issued by trusts related to bank holding companies and insurance companies (“collateral issuers”). They are rated by one or more Nationally Recognized Statistical Rating Organizations (“NRSROs”), which are rating agencies registered with the Securities and Exchange Commission (“SEC”). The more junior securities were purchased generally at par, while the senior securities were purchased from Lockhart Funding LLC (“Lockhart”), a previously consolidated qualifying special-purpose entity securities conduit, at their carrying values (generally par) and then adjusted to their lower fair values.
The primary driver of unrealized losses on CDOs with bank only or bank and insurance collateral are market yield requirements for bank and bank and insurance CDO securities. The financial crisis and economic downturn resulted in significant utilization of both the unique five-year deferral option, which each collateral issuer maintains during the life of the CDO, and the payment in kind (“PIK”) feature of junior priority securities. The PIK feature provides that upon the CDO reaching certain levels of collateral default or deferral, certain junior CDO tranches will not receive current interest but will instead have the unpaid interest amount capitalized. The rate of return demanded by the market for trust preferred CDOs remains substantially higher than the contractual interest rates. CDO tranches backed by bank trust preferred securities continue to be characterized by uncertainty surrounding collateral behavior, specifically including but not limited to, prepayments; the future number, size and timing of bank failures; holding company bankruptcies; and allowed deferrals and subsequent resumption of payment or default due to nonpayment of contractual interest.
Our ongoing review of these securities determined that no OTTI should be recorded in the first quarter of 2015.
OTTI – U.S. Government Agencies and Corporations
Agency securities: These securities were issued by the Federal Agricultural Mortgage Corporation (“FAMC”) and the Export-Import Bank of the U.S. These securities are floating rate and were purchased at premiums or discounts. They have maturity dates from 1 to 25 years and have contractual cash flows guaranteed by agencies of the U.S. Government. Unrealized losses relate to changes in interest rates subsequent to purchase and are not attributable to credit. At March 31, 2015, we did not have an intent to sell identified securities with unrealized losses or initiate such sales, and we believe it is more likely than not we would not be required to sell such securities before recovery of their amortized cost basis. Therefore, we did not record OTTI for these securities during the first quarter of 2015.
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 SBA. Unrealized losses relate to changes in interest rates subsequent to purchase and are not attributable to credit. At March 31, 2015, we did not have an intent to sell identified SBA securities with unrealized losses or initiate such sales, and we believe it is more likely than not we would not be required to sell such securities before recovery of their amortized cost basis. Therefore, we did not record OTTI for these securities during the first quarter of 2015.
The following is a tabular rollforward of the total amount of credit-related OTTI:
(In thousands)	Three Months Ended										Three Months Ended
	31-Mar-15										31-Mar-14
	HTM			AFS				Total			HTM				AFS			Total
Balance of credit-related OTTI at beginning	$	(9,079	)	$	(95,472	)		$	(104,551	)	$	(9,052	)		$	(176,833	)	$	(185,885	)
of period
Additional credit-related OTTI on securities previously impaired	—			—				—			(27		)		—			(27		)
Reductions for securities sold or paid off during the period	—			1,313				1,313			—				12,919			12,919
Reclassification of securities from HTM to AFS	9,079			(9,079		)		—			—				—			—
Balance of credit-related OTTI at end of period	$	—		$	(103,238	)		$	(103,238	)	$	(9,079	)		$	(163,914	)	$	(172,993	)
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 utilized. In addition, certain internal and external models may be utilized. See Note 10 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:
		Three Months Ended
		March 31, 2015							March 31, 2014
	(In thousands)	Gross gains			Gross losses				Gross gains			Gross losses
	Investment securities:
	Held-to-maturity	$	1		$	—			$	—		$	27
	Available-for-sale	958			1,198				72,561			41,647
	Other noninterest-bearing investments	3,595			242				912			—
		4,554			1,440				73,473			41,674
	Net gains				$	3,114						$	31,799
	Statement of income information:
	Net impairment losses on investment securities				$	—						$	(27	)
	Equity securities gains, net				3,353							912
	Fixed income securities gains (losses), net				(239		)					30,914
	Net gains				$	3,114						$	31,799
Interest income by security type is as follows:
(In thousands)	Three Months Ended										Three Months Ended
	31-Mar-15										31-Mar-14
	Taxable			Nontaxable				Total			Taxable				Nontaxable			Total
Investment securities:
Held-to-maturity	$	3,592		$	2,862			$	6,454		$	3,828			$	2,836		$	6,664
Available-for-sale	19,768			653				20,421			20,424				524			20,948
Trading	598			—				598			482				—			482
	$	23,958		$	3,515			$	27,473		$	24,734			$	3,360		$	28,094
Investment securities with a carrying value of $1.3 billion at March 31, 2015 and $1.4 billion at December 31, 2014 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 (“VR”)
The VR, as published pursuant to the Dodd-Frank Act in December 2013 and amended in January 2014, significantly restricted certain activities by covered bank holding companies, including restrictions on certain types of securities, proprietary trading, and private equity investing. As of December 31, 2014, the only prohibited investments under the VR requiring divestiture by the Company were certain of its private equity investments (“PEIs”). Of the recorded PEIs of $132 million at March 31, 2015 (consisting of Small Business Investment Companies (“SBICs”) and non-SBICs), approximately $33 million were prohibited by the VR.
As discussed in Note 11, we have $35 million of unfunded commitments for PEIs, of which approximately $8 million relate to prohibited PEIs. Until we dispose of the prohibited PEIs, we expect to fund these commitments if and as the capital calls are made, as allowed under the VR.
During the first quarter of 2015, we recorded approximately $5 million in sales of PEIs resulting in insignificant amounts of net realized gains. All of these sales related to prohibited PEIs. During 2014 since the final issuance of the VR, we have sold approximately $8.3 million of prohibited PEIs. We anticipate disposing of the remainder of these prohibited PEIs before the required deadline. However, the required deadline has been extended to July 21, 2016 from July 21, 2015 and the Federal Reserve has announced its intention to act in 2015 to grant an additional one-year extension to July 21, 2017. See other discussions in Notes 10 and 11.

Loans_And_Allowance_For_Credit

Loans And Allowance For Credit Losses	3 Months Ended
	Mar. 31, 2015
Loans And Allowance For Credit Losses [Abstract]
Loans And Allowance For Credit Losses	LOANS AND ALLOWANCE FOR CREDIT LOSSES
	Loans and Loans Held for Sale
	Loans are summarized as follows according to major portfolio segment and specific loan class:
	(In thousands)	March 31,			December 31,
		2015			2014
	Loans held for sale	$	128,946		$	132,504
	Commercial:
	Commercial and industrial	$	13,264,092		$	13,162,955
	Leasing	407,137			408,974
	Owner occupied	7,309,639			7,351,548
	Municipal	555,122			520,887
	Total commercial	21,535,990			21,444,364
	Commercial real estate:
	Construction and land development	2,044,641			1,986,408
	Term	8,088,430			8,126,600
	Total commercial real estate	10,133,071			10,113,008
	Consumer:
	Home equity credit line	2,314,806			2,321,150
	1-4 family residential	5,212,963			5,200,882
	Construction and other consumer real estate	373,335			370,542
	Bankcard and other revolving plans	406,723			401,352
	Other	203,226			212,360
	Total consumer	8,511,053			8,506,286
	Total loans	$	40,180,114		$	40,063,658
	Loan balances are presented net of unearned income and fees, which amounted to $142.8 million at March 31, 2015 and $144.7 million at December 31, 2014.
	Owner occupied and commercial real estate (“CRE”) loans include unamortized premiums of approximately $33.7 million at March 31, 2015 and $36.5 million at December 31, 2014.
	Municipal loans generally include loans to municipalities with the debt service being repaid from general funds or pledged revenues of the municipal entity, or to private commercial entities or 501(c)(3) not-for-profit entities utilizing a pass-through municipal entity to achieve favorable tax treatment.
	Land development loans included in the construction and land development loan class were $462.7 million at March 31, 2015 and $484.9 million at December 31, 2014.
	Loans with a carrying value of approximately $22.6 billion at March 31, 2015 and $22.5 billion at December 31, 2014 have been pledged at the Federal Reserve and various Federal Home Loan Banks (“FHLBs”) as collateral for current and potential borrowings. Note 8 presents the balance of FHLB advances made to the Company against this pledged collateral.
	We sold loans with a carrying value of $300.4 million and $337.6 million for the three months ended March 31, 2015 and 2014, respectively, that were classified as loans held for sale. The sold loans were derecognized from the balance sheet. Loans classified as loans held for sale primarily consist of conforming residential mortgages and the guaranteed portion of SBA loans. The principal balance of sold loans for which we retain servicing was approximately $1.2 billion at both March 31, 2015 and December 31, 2014.
	Amounts added to loans held for sale during these periods were $309.7 million and $295.5 million, respectively. Income from loans sold, excluding servicing, for these same periods was $4.6 million and $3.5 million.
	Since 2009, CB&T and NSB have had loss sharing agreements with the Federal Deposit Insurance Corporation (“FDIC”), which provided indemnification for credit losses of acquired loans and foreclosed assets up to specified thresholds. The last of the agreements for commercial loans, which comprised the major portion of the acquired portfolio, expired as of September 30, 2014. The agreements for 1-4 family residential loans will expire in 2019. In previous periods, the FDIC-supported loan balances were presented separately in this footnote and in other disclosures, and included purchased credit-impaired (“PCI”) loans, as subsequently discussed in Purchased Loans. Due to declining balances, for all periods presented herein, the FDIC-supported/PCI loans have been reclassified to their respective loan segments and classes.
	Allowance for Credit Losses
	The allowance for credit losses (“ACL”) consists of the allowance for loan and lease losses (“ALLL”) (also referred to as the allowance for loan losses) and the reserve for unfunded lending commitments (“RULC”).
	Allowance for Loan and Lease Losses
	The ALLL represents our estimate of probable and estimable losses inherent in the loan and lease portfolio as of the balance sheet date. Losses are charged to the ALLL when recognized. Generally, commercial loans are charged off or charged down 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 the process of collection. Consumer loans are either charged off or charged down to net realizable value no later than the month in which they become 180 days past due. Closed-end 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 portfolio segment of the loan. The methodology for impaired loans is discussed subsequently. For the commercial and CRE segments, we use a comprehensive loan grading system to assign probability of default (“PD”) and loss given default (“LGD”) grades to each loan. The credit quality indicators discussed subsequently are based on this grading system. In addition, loan officers utilize their experience and judgment in assigning PD and LGD grades, subject to confirmation of the PD and LGD by either credit risk or credit examination. We create groupings of these grades for each subsidiary bank and loan class and calculate historic loss rates using a loss migration analysis that attributes historic realized losses to these loan grade groupings over the period of January 2008 through the most recent full quarter.
	For the consumer loan segment, we use roll rate models to forecast probable inherent losses. Roll rate models measure the rate at which consumer loans migrate from one delinquency category to the next worse delinquency category, and eventually to loss. We estimate roll rates for consumer loans using recent delinquency and loss experience by segmenting our consumer loan portfolio into separate pools based on common risk characteristics and separately calculating historical delinquency and loss experience for each pool. These roll rates are then applied to current delinquency levels to estimate probable inherent losses. Roll rates incorporate housing market trends inasmuch as these trends manifest themselves in charge-offs and delinquencies. In addition, our qualitative and environmental factors discussed subsequently incorporate the most recent housing market trends.
	The current status and historical changes in qualitative and environmental factors may not be reflected in our quantitative models. Thus, after applying historical loss experience, as described above, we review the quantitatively derived level of ALLL for each segment using qualitative criteria and use those criteria to determine our estimate within the range. We track various risk factors that influence our judgment regarding the level of the ALLL across the portfolio segments. These factors primarily include:
	•	Asset quality trends
	•	Risk management and loan administration practices
	•	Risk identification practices
	•	Effect of changes in the nature and volume of the portfolio
	•	Existence and effect of any portfolio concentrations
	•	National economic and business conditions
	•	Regional and local economic and business conditions
	•	Data availability and applicability
	•	Effects of other external factors
	The magnitude of the impact of these factors on our qualitative assessment of the ALLL changes from quarter to quarter according to 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 the allowance for credit losses are summarized as follows:
		Three Months Ended March 31, 2015
	(In thousands)	Commercial			Commercial			Consumer			Total
					real estate
	Allowance for loan losses:
	Balance at beginning of period	$	412,514		$	145,009		$	47,140		$	604,663
	Additions:
	Provision for loan losses	24,934			(26,887		)	459			(1,494		)
	Adjustment for FDIC-supported/PCI loans	(38		)							(38		)
	Deductions:
	Gross loan and lease charge-offs	(15,951		)	(626		)	(3,611		)	(20,188		)
	Recoveries	20,613			14,119			2,338			37,070
	Net loan and lease charge-offs	4,662			13,493			(1,273		)	16,882
Balance at end of period	$	442,072		$	131,615		$	46,326		$	620,013
Reserve for unfunded lending commitments:
Balance at beginning of period	$	58,931		$	21,517		$	628		$	81,076
Provision charged (credited) to earnings	3,844			(2,580		)	(53		)	1,211
Balance at end of period	$	62,775		$	18,937		$	575		$	82,287
Total allowance for credit losses at end of period:
Allowance for loan losses	$	442,072		$	131,615		$	46,326		$	620,013
Reserve for unfunded lending commitments	62,775			18,937			575			82,287
Total allowance for credit losses	$	504,847		$	150,552		$	46,901		$	702,300
	Three Months Ended March 31, 2014
(In thousands)	Commercial			Commercial			Consumer			Total
				real estate
Allowance for loan losses:
Balance at beginning of period	$	469,213		$	216,012		$	61,066		$	746,291
Additions:
Provision for loan losses	11,260			(2,891		)	(8,979		)	(610		)
Adjustment for FDIC-supported/PCI loans	(781		)	—			(36		)	(817		)
Deductions:
Gross loan and lease charge-offs	(9,796		)	(7,854		)	(3,145		)	(20,795		)
Recoveries	7,805			2,882			2,197			12,884
Net loan and lease charge-offs	(1,991		)	(4,972		)	(948		)	(7,911		)
Balance at end of period	$	477,701		$	208,149		$	51,103		$	736,953
Reserve for unfunded lending commitments:
Balance at beginning of period	$	48,345		$	37,485		$	3,875		$	89,705
Provision charged (credited) to earnings	1,525			(2,212		)	(325		)	(1,012		)
Balance at end of period	$	49,870		$	35,273		$	3,550		$	88,693
Total allowance for credit losses at end of period:
Allowance for loan losses	$	477,701		$	208,149		$	51,103		$	736,953
Reserve for unfunded lending commitments	49,870			35,273			3,550			88,693
Total allowance for credit losses	$	527,571		$	243,422		$	54,653		$	825,646
The ALLL and outstanding loan balances according to the Company’s impairment method are summarized as follows:
	March 31, 2015
(In thousands)	Commercial			Commercial			Consumer			Total
				real estate
Allowance for loan losses:
Individually evaluated for impairment	$	38,382		$	5,326		$	9,437		$	53,145
Collectively evaluated for impairment	402,597			126,231			36,602			565,430
Purchased loans with evidence of credit deterioration	1,093			58			287			1,438
Total	$	442,072		$	131,615		$	46,326		$	620,013
Outstanding loan balances:
Individually evaluated for impairment	$	305,678		$	141,470		$	88,073		$	535,221
Collectively evaluated for impairment	21,156,592			9,917,574			8,407,837			39,482,003
Purchased loans with evidence of credit deterioration	73,720			74,027			15,143			162,890
Total	$	21,535,990		$	10,133,071		$	8,511,053		$	40,180,114
	December 31, 2014
(In thousands)	Commercial			Commercial			Consumer			Total
				real estate
Allowance for loan losses:
Individually evaluated for impairment	$	28,627		$	4,027		$	9,059		$	41,713
Collectively evaluated for impairment	382,552			140,090			37,508			560,150
Purchased loans with evidence of credit deterioration	1,335			892			573			2,800
Total	$	412,514		$	145,009		$	47,140		$	604,663
Outstanding loan balances:
Individually evaluated for impairment	$	259,207		$	167,435		$	95,267		$	521,909
Collectively evaluated for impairment	21,105,217			9,861,862			8,395,371			39,362,450
Purchased loans with evidence of credit deterioration	79,940			83,711			15,648			179,299
Total	$	21,444,364		$	10,113,008		$	8,506,286		$	40,063,658
Nonaccrual and Past Due Loans
Loans are generally placed on nonaccrual status when payment in full of principal and interest is not expected, or the loan is 90 days or more past due as to principal or interest, unless the loan is both well secured and in the process of collection. Factors we consider in determining whether a loan is placed on nonaccrual include delinquency status, collateral value, borrower or guarantor financial statement information, bankruptcy status, and other information which would indicate that the full and timely collection of interest and principal is uncertain.
A nonaccrual loan may be returned to accrual status when all delinquent interest and principal become current in accordance with the terms of the loan agreement; the loan, if secured, is well secured; the borrower has paid according to the contractual terms for a minimum of six months; and analysis of the borrower indicates a reasonable assurance of the ability and willingness to maintain payments. Payments received on nonaccrual loans are applied as a reduction to the principal outstanding.
Closed-end loans with payments scheduled monthly are reported as past due when the borrower is in arrears for two or more monthly payments. Similarly, open-end credit such as charge-card plans and other revolving credit plans are reported as past due when the minimum payment has not been made for two or more billing cycles. Other multi-payment obligations (i.e., quarterly, semiannual, etc.), single payment, and demand notes are reported as past due when either principal or interest is due and unpaid for a period of 30 days or more.
Nonaccrual loans are summarized as follows:
(In thousands)	March 31,			December 31,
	2015			2014
Commercial:
Commercial and industrial	$	163,499		$	105,591
Leasing	247			295
Owner occupied	97,609			87,243
Municipal	1,027			1,056
Total commercial	262,382			194,185
Commercial real estate:
Construction and land development	22,101			23,880
Term	37,517			25,107
Total commercial real estate	59,618			48,987
Consumer:
Home equity credit line	10,337			11,430
1-4 family residential	48,078			49,861
Construction and other consumer real estate	1,301			1,735
Bankcard and other revolving plans	318			196
Other	32			254
Total consumer loans	60,066			63,476
Total	$	382,066		$	306,648
Past due loans (accruing and nonaccruing) are summarized as follows:
	March 31, 2015
(In thousands)	Current			30-89 days			90+ days			Total			Total		Accruing		Nonaccrual
				past due			past due			past due			loans		loans		loans
															90+ days		that are
															past due		current 1
Commercial:
Commercial and industrial	$	13,182,403		$	42,881		$	38,808		$	81,689		$	13,264,092	$	2,969	$	109,978
Leasing	406,902			208			27			235			407,137		—		197
Owner occupied	7,222,254			44,380			43,005			87,385			7,309,639		2,247		40,515
Municipal	553,002			2,120			—			2,120			555,122		—		1,027
Total commercial	21,364,561			89,589			81,840			171,429			21,535,990		5,216		151,717
Commercial real estate:
Construction and land development	2,027,240			4,114			13,287			17,401			2,044,641		2,590		11,338
Term	8,038,106			17,208			33,116			50,324			8,088,430		21,910		23,398
Total commercial real estate	10,065,346			21,322			46,403			67,725			10,133,071		24,500		34,736
Consumer:
Home equity credit line	2,302,583			4,522			7,701			12,223			2,314,806		—		1,103
1-4 family residential	5,181,356			12,780			18,827			31,607			5,212,963		268		22,781
Construction and other consumer real estate	361,483			10,682			1,170			11,852			373,335		556		664
Bankcard and other revolving plans	402,775			2,859			1,089			3,948			406,723		951		98
Other	202,276			889			61			950			203,226		61		27
Total consumer loans	8,450,473			31,732			28,848			60,580			8,511,053		1,836		24,673
Total	$	39,880,380		$	142,643		$	157,091		$	299,734		$	40,180,114	$	31,552	$	211,126
	December 31, 2014
(In thousands)	Current			30-89 days			90+ days			Total			Total		Accruing		Nonaccrual
				past due			past due			past due			loans		loans		loans
															90+ days		that are
															past due		current 1
Commercial:
Commercial and industrial	$	13,092,731		$	28,295		$	41,929		$	70,224		$	13,162,955	$	4,677	$	64,385
Leasing	408,724			225			25			250			408,974		—		270
Owner occupied	7,275,842			29,182			46,524			75,706			7,351,548		3,334		39,649
Municipal	520,887			—			—			—			520,887		—		1,056
Total commercial	21,298,184			57,702			88,478			146,180			21,444,364		8,011		105,360
Commercial real estate:
Construction and land development	1,972,206			2,711			11,491			14,202			1,986,408		92		12,481
Term	8,082,940			14,415			29,245			43,660			8,126,600		19,700		13,787
Total commercial real estate	10,055,146			17,126			40,736			57,862			10,113,008		19,792		26,268
Consumer:
Home equity credit line	2,309,967			4,503			6,680			11,183			2,321,150		1		1,779
1-4 family residential	5,163,610			12,416			24,856			37,272			5,200,882		318		20,599
Construction and other consumer real estate	359,723			9,675			1,144			10,819			370,542		160		608
Bankcard and other revolving plans	397,882			2,425			1,045			3,470			401,352		946		80
Other	211,560			644			156			800			212,360		—		84
Total consumer loans	8,442,742			29,663			33,881			63,544			8,506,286		1,425		23,150
Total	$	39,796,072		$	104,491		$	163,095		$	267,586		$	40,063,658	$	29,228	$	154,778
1	Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.
Credit Quality Indicators
In addition to the past due and nonaccrual criteria, we also analyze loans using loan risk grading systems, which vary based on the size and type of credit risk exposure. The internal risk grades assigned to loans follow our definitions of Pass, Special Mention, Substandard, and Doubtful, which are consistent with published definitions of regulatory risk classifications.
Definitions of Pass, Special Mention, Substandard, and Doubtful are summarized as follows:
Pass – A Pass asset is higher quality and does not fit any of the other categories described below. The likelihood of loss is considered remote.
Special Mention – A Special Mention asset has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the bank’s credit position at some future date.
Substandard – A Substandard asset is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Assets so classified have well-defined weaknesses and are characterized by the distinct possibility that the bank may sustain some loss if deficiencies are not corrected.
Doubtful – A Doubtful asset has all the weaknesses inherent in a Substandard asset with the added characteristics that the weaknesses make collection or liquidation in full highly questionable 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 judgment. For these larger loans, we assign one of multiple grades within the Pass classification or one of the following four grades: Special Mention, Substandard, Doubtful, and Loss. Loss indicates that the outstanding balance has been charged off. We confirm our internal risk grades quarterly, or as soon as we identify information that affects the credit risk of the loan.
For consumer loans or certain small commercial loans with commitments equal to or less than $750,000, we generally assign internal risk grades similar to those described previously based on automated rules that depend on refreshed credit scores, payment performance, and other risk indicators. These are generally assigned either a Pass or Substandard grade and are reviewed as we identify information that might warrant a grade change.
Outstanding loan balances (accruing and nonaccruing) categorized by these credit quality indicators are summarized as follows:
	March 31, 2015
(In thousands)	Pass			Special			Sub-			Doubtful			Total		Total
				Mention			standard						loans		allowance
Commercial:
Commercial and industrial	$	12,342,163		$	325,604		$	587,272		$	9,053		$	13,264,092
Leasing	388,843			11,656			6,638			—			407,137
Owner occupied	6,851,794			111,853			345,992			—			7,309,639
Municipal	552,874			1,221			1,027			—			555,122
Total commercial	20,135,674			450,334			940,929			9,053			21,535,990		$	442,072
Commercial real estate:
Construction and land development	1,994,072			8,515			42,054			—			2,044,641
Term	7,827,313			68,890			187,799			4,428			8,088,430
Total commercial real estate	9,821,385			77,405			229,853			4,428			10,133,071		131,615
Consumer:
Home equity credit line	2,298,505			—			16,301			—			2,314,806
1-4 family residential	5,149,513			—			63,450			—			5,212,963
Construction and other consumer real estate	370,817			—			2,518			—			373,335
Bankcard and other revolving plans	404,826			—			1,897			—			406,723
Other	202,909			—			317			—			203,226
Total consumer loans	8,426,570			—			84,483			—			8,511,053		46,326
Total	$	38,383,629		$	527,739		$	1,255,265		$	13,481		$	40,180,114	$	620,013
	December 31, 2014
(In thousands)	Pass			Special			Sub-			Doubtful			Total		Total
				Mention			standard						loans		allowance
Commercial:
Commercial and industrial	$	12,515,846		$	209,215		$	426,002		$	11,892		$	13,162,955
Leasing	399,032			4,868			5,074			—			408,974
Owner occupied	6,844,310			168,423			338,815			—			7,351,548
Municipal	518,513			1,318			1,056			—			520,887
Total commercial	20,277,701			383,824			770,947			11,892			21,444,364		$	412,514
Commercial real estate:
Construction and land development	1,925,685			8,464			52,259			—			1,986,408
Term	7,802,571			96,347			223,324			4,358			8,126,600
Total commercial real estate	9,728,256			104,811			275,583			4,358			10,113,008		145,009
Consumer:
Home equity credit line	2,304,352			—			16,798			—			2,321,150
1-4 family residential	5,138,660			—			62,222			—			5,200,882
Construction and other consumer real estate	367,932			—			2,610			—			370,542
Bankcard and other revolving plans	399,446			—			1,906			—			401,352
Other	211,811			—			549			—			212,360
Total consumer loans	8,422,201			—			84,085			—			8,506,286		47,140
Total	$	38,428,158		$	488,635		$	1,130,615		$	16,250		$	40,063,658	$	604,663
Impaired Loans
Loans are considered impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due in accordance with the contractual terms of the loan agreement, including scheduled interest payments. For our non-purchased credit-impaired loans, if a nonaccrual loan has a balance greater than $1 million, or if a loan is a troubled debt restructuring (“TDR”), including TDRs that subsequently default, or if the loan is no longer reported as a TDR, we individually evaluate the loan for impairment and estimate a specific reserve for the loan for all portfolio segments under applicable accounting guidance. Smaller nonaccrual loans are pooled for ALLL estimation purposes. PCI loans are included in impaired loans and are accounted for under separate accounting guidance. See subsequent discussion under Purchased Loans.
When a loan is impaired, we estimate a specific reserve for the loan based on the projected present value of the loan’s future cash flows discounted at the loan’s effective interest rate, the observable market price of the loan, or the fair value of the loan’s underlying collateral. The process of estimating future cash flows also incorporates the same determining factors discussed previously under nonaccrual loans. When we base the impairment amount on the fair value of the loan’s underlying collateral, we generally charge off the portion of the balance that is impaired, such that these loans do not have a specific reserve in the ALLL. Payments received on impaired loans that are accruing are recognized in interest income, according to the contractual loan agreement. Payments received on impaired loans that are on nonaccrual are not recognized in interest income, but are applied as a reduction to the principal outstanding. The amount of interest income recognized on a cash basis during the time the loans were impaired within the three months ended March 31, 2015 and 2014 was not significant.
Information on impaired loans individually evaluated is summarized as follows, including the average recorded investment and interest income recognized for the three months ended March 31, 2015 and 2014:
	March 31, 2015
(In thousands)	Unpaid			Recorded investment						Total			Related
	principal									recorded			allowance
	balance			with no			with			investment
				allowance			allowance
Commercial:
Commercial and industrial	$	223,938		$	34,260		$	147,353		$	181,613		$	30,899
Owner occupied	202,999			102,672			73,403			176,075			7,341
Municipal	1,505			1,027			—			1,027			—
Total commercial	428,442			137,959			220,756			358,715			38,240
Commercial real estate:
Construction and land development	55,316			12,565			25,897			38,462			1,293
Term	180,822			116,700			30,231			146,931			3,550
Total commercial real estate	236,138			129,265			56,128			185,393			4,843
Consumer:
Home equity credit line	29,149			14,491			11,288			25,779			189
1-4 family residential	80,023			30,356			36,681			67,037			8,885
Construction and other consumer real estate	3,498			1,310			1,246			2,556			187
Bankcard and other revolving plans	—			—			—			—			—
Other	5,825			—			4,674			4,674			95
Total consumer loans	118,495			46,157			53,889			100,046			9,356
Total	$	783,075		$	313,381		$	330,773		$	644,154		$	52,439
	December 31, 2014
(In thousands)	Unpaid			Recorded investment						Total			Related
	principal									recorded			allowance
	balance			with no			with			investment
				allowance			allowance
Commercial:
Commercial and industrial	$	185,520		$	43,257		$	103,565		$	146,822		$	22,852
Owner occupied	198,231			83,179			86,382			169,561			6,087
Municipal	1,535			1,056			—			1,056			—
Total commercial	385,286			127,492			189,947			317,439			28,939
Commercial real estate:
Construction and land development	60,993			16,500			26,977			43,477			1,773
Term	203,788			96,351			63,740			160,091			2,345
Total commercial real estate	264,781			112,851			90,717			203,568			4,118
Consumer:
Home equity credit line	30,209			14,798			11,883			26,681			437
1-4 family residential	86,575			37,096			35,831			72,927			8,494
Construction and other consumer real estate	3,902			1,449			1,410			2,859			233
Bankcard and other revolving plans	—			—			—			—			—
Other	6,580			—			5,254			5,254			133
Total consumer loans	127,266			53,343			54,378			107,721			9,297
Total	$	777,333		$	293,686		$	335,042		$	628,728		$	42,354
	Three Months Ended						Three Months Ended
	31-Mar-15						31-Mar-14
(In thousands)	Average			Interest			Average			Interest
	recorded			income			recorded			income
	investment			recognized			investment			recognized
Commercial:
Commercial and industrial	$	160,013		$	1,451		$	188,191		$	2,591
Owner occupied	177,568			4,092			237,902			4,758
Municipal	1,033			—			—			—
Total commercial	338,614			5,543			426,093			7,349
Commercial real estate:
Construction and land development	38,736			569			66,772			3,538
Term	143,496			5,008			293,802			14,183
Total commercial real estate	182,232			5,577			360,574			17,721
Consumer:
Home equity credit line	25,386			413			25,224			402
1-4 family residential	66,711			510			83,241			540
Construction and other consumer real estate	2,560			42			3,490			38
Bankcard and other revolving plans	2			100			10			1
Other	4,748			285			8,595			494
Total consumer loans	99,407			1,350			120,560			1,475
Total	$	620,253		$	12,470		$	907,227		$	26,545
Modified and Restructured Loans
Loans may be modified in the normal course of business for competitive reasons or to strengthen the Company’s position. Loan modifications and restructurings may also occur when the borrower experiences financial difficulty and needs temporary or permanent relief from the original contractual terms of the loan. These modifications are structured on a loan-by-loan basis and, depending on the circumstances, may include extended payment terms, a modified interest rate, forgiveness of principal, or other concessions. Loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for which the Company has granted a concession that it would not otherwise consider, are considered TDRs.
We consider many factors in determining whether to agree to a loan modification involving concessions, and seek a solution that will both minimize potential loss to the Company and attempt to help the borrower. We evaluate borrowers’ current and forecasted future cash flows, their ability and willingness to make current contractual or proposed modified payments, the value of the underlying collateral (if applicable), the possibility of obtaining additional security or guarantees, and the potential costs related to a repossession or foreclosure and the subsequent sale of the collateral.
TDRs are classified as either accrual or nonaccrual loans. A loan on nonaccrual and restructured as a TDR will remain on nonaccrual status until the borrower has proven the ability to perform under the modified structure for a minimum of six months, and there is evidence that such payments can and are likely to continue as agreed. Performance prior to the restructuring, or significant events that coincide with the restructuring, are included in assessing whether the borrower can meet the new terms and may result in the loan being returned to accrual at the time of restructuring or after a shorter performance period. If the borrower’s ability to meet the revised payment schedule is uncertain, the loan remains classified as a nonaccrual loan. A TDR loan that specifies an interest rate that at the time of the restructuring is greater than or equal to the rate the bank is willing to accept for a new loan with comparable risk may not be reported as a TDR or an impaired loan in the calendar years subsequent to the restructuring if it is in compliance with its modified terms.
Selected information on TDRs that includes the recorded investment on an accruing and nonaccruing basis by loan class and modification type is summarized in the following schedules:
	March 31, 2015
	Recorded investment resulting from the following modification types:
(In thousands)	Interest			Maturity			Principal			Payment			Other1		Multiple		Total
	rate below			or term			forgiveness			deferral					modification
	market			extension											types2
Accruing
Commercial:
Commercial and industrial	$	2,509		$	3,462		$	17		$	464		$	151	$	21,929	$	28,532
Owner occupied	19,744			1,092			952			1,241			10,845		17,167		51,041
Total commercial	22,253			4,554			969			1,705			10,996		39,096		79,573
Commercial real estate:
Construction and land development	—			—			—			—			510		13,712		14,222
Term	7,238			1,019			176			973			2,289		32,729		44,424
Total commercial real estate	7,238			1,019			176			973			2,799		46,441		58,646
Consumer:
Home equity credit line	741			84			10,968			—			164		1,623		13,580
1-4 family residential	2,402			366			7,073			442			1,381		33,676		45,340
Construction and other consumer real estate	284			416			—			—			—		1,226		1,926
Total consumer loans	3,427			866			18,041			442			1,545		36,525		60,846
Total accruing	32,918			6,439			19,186			3,120			15,340		122,062		199,065
Nonaccruing
Commercial:
Commercial and industrial	322			515			—			3,310			6,951		25,035		36,133
Owner occupied	2,328			1,163			—			833			2,525		11,027		17,876
Municipal	—			1,027			—			—			—		—		1,027
Total commercial	2,650			2,705			—			4,143			9,476		36,062		55,036
Commercial real estate:
Construction and land development	10,901			66			—			93			3,249		7,667		21,976
Term	2,780			—			865			2,170			—		9,901		15,716
Total commercial real estate	13,681			66			865			2,263			3,249		17,568		37,692
Consumer:
Home equity credit line	—			—			713			203			—		150		1,066
1-4 family residential	207			227			2,245			185			3,601		9,699		16,164
Construction and other consumer real estate	—			243			—			76			—		87		406
Total consumer loans	207			470			2,958			464			3,601		9,936		17,636
Total nonaccruing	16,538			3,241			3,823			6,870			16,326		63,566		110,364
Total	$	49,456		$	9,680		$	23,009		$	9,990		$	31,666	$	185,628	$	309,429
	December 31, 2014
	Recorded investment resulting from the following modification types:
(In thousands)	Interest			Maturity			Principal			Payment			Other1		Multiple		Total
	rate below			or term			forgiveness			deferral					modification
	market			extension											types2
Accruing
Commercial:
Commercial and industrial	$	2,611		$	6,509		$	18		$	3,203		$	3,855	$	34,585	$	50,781
Owner occupied	19,981			1,124			960			1,251			10,960		17,505		51,781
Total commercial	22,592			7,633			978			4,454			14,815		52,090		102,562
Commercial real estate:
Construction and land development	—			—			—			—			521		19,854		20,375
Term	7,328			9,027			179			3,153			2,546		39,007		61,240
Total commercial real estate	7,328			9,027			179			3,153			3,067		58,861		81,615
Consumer:
Home equity credit line	742			70			11,320			—			166		1,281		13,579
1-4 family residential	2,425			552			6,828			446			753		34,719		45,723
Construction and other consumer real estate	290			422			42			90			—		1,227		2,071
Total consumer loans	3,457			1,044			18,190			536			919		37,227		61,373
Total accruing	33,377			17,704			19,347			8,143			18,801		148,178		245,550
Nonaccruing
Commercial:
Commercial and industrial	442			576			—			611			5,199		20,410		27,238
Owner occupied	2,714			1,219			—			883			2,852		12,040		19,708
Municipal	—			1,056			—			—			—		—		1,056
Total commercial	3,156			2,851			—			1,494			8,051		32,450		48,002
Commercial real estate:
Construction and land development	11,080			68			—			93			3,300		6,427		20,968
Term	2,851			—			—			—			277		4,607		7,735
Total commercial real estate	13,931			68			—			93			3,577		11,034		28,703
Consumer:
Home equity credit line	—			—			420			203			—		399		1,022
1-4 family residential	3,378			1,029			1,951			191			3,527		9,413		19,489
Construction and other consumer real estate	—			463			—			—			—		100		563
Total consumer loans	3,378			1,492			2,371			394			3,527		9,912		21,074
Total nonaccruing	20,465			4,411			2,371			1,981			15,155		53,396		97,779
Total	$	53,842		$	22,115		$	21,718		$	10,124		$	33,956	$	201,574	$	343,329
1	Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.
2	Includes TDRs that resulted from a combination of any of the previous modification types.
Unfunded lending commitments on TDRs amounted to approximately $7.5 million at March 31, 2015 and $6.1 million at December 31, 2014.
The total recorded investment of all TDRs in which interest rates were modified below market was $198.6 million at March 31, 2015 and $219.3 million at December 31, 2014. These loans are included in the previous schedule in the columns for interest rate below market and multiple modification types.
The net financial impact on interest income due to interest rate modifications below market for accruing TDRs is summarized in the following schedule:
	Three Months Ended
	March 31,
(In thousands)	2015			2014
Commercial:
Commercial and industrial	$	(57	)	$	18
Owner occupied	(112		)	(142		)
Total commercial	(169		)	(124		)
Commercial real estate:
Construction and land development	(37		)	(56		)
Term	(109		)	(148		)
Total commercial real estate	(146		)	(204		)
Consumer:
Home equity credit line	(1		)	(2		)
1-4 family residential	(271		)	(300		)
Construction and other consumer real estate	(7		)	(9		)
Total consumer loans	(279		)	(311		)
Total decrease to interest income1	$	(594	)	$	(639	)
1Calculated based on the difference between the modified rate and the premodified rate applied to the recorded investment.
On an ongoing basis, we monitor the performance of all TDRs according to their restructured terms. Subsequent payment default is defined in terms of delinquency, when principal or interest payments are past due 90 days or more for commercial loans, or 60 days or more for consumer loans.
The recorded investment of accruing and nonaccruing TDRs that had a payment default during the period listed below (and are still in default at period end) and are within 12 months or less of being modified as TDRs is as follows:
	Three Months Ended									Three Months Ended
	31-Mar-15									31-Mar-14
(In thousands)	Accruing			Nonaccruing			Total			Accruing			Nonaccruing		Total
Commercial:
Commercial and industrial	$	—		$	44		$	44		$	—		$	—	$	—
Owner occupied	—			986			986			—			—		—
Total commercial	—			1,030			1,030			—			—		—
Commercial real estate:
Construction and land development	—			1,284			1,284			—			—		—
Term	—			—			—			—			84		84
Total commercial real estate	—			1,284			1,284			—			84		84
Consumer:
Home equity credit line	—			—			—			—			217		217
1-4 family residential	110			—			110			—			—		—
Construction and other consumer real estate	—			—			—			—			26		26
Total consumer loans	110			—			110			—			243		243
Total	$	110		$	2,314		$	2,424		$	—		$	327	$	327
Note: Total loans modified as TDRs during the 12 months previous to March 31, 2015 and 2014 were $74.5 million and $142.4 million, respectively.
As of March 31, 2015, the amount of foreclosed residential real estate property held by the Company was approximately $4.8 million, and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure was approximately $10.5 million.
Concentrations of Credit Risk
Credit risk is the possibility of loss from the failure of a borrower, guarantor, or another obligor to fully perform under the terms of a credit-related contract. Credit risks (whether on- or off-balance sheet) may occur when individual borrowers, groups of borrowers, or counterparties have similar economic characteristics, including industries, geographies, collateral types, sponsors, etc., and are similarly affected by changes in economic or other conditions. Credit risk also includes the loss that would be recognized subsequent to the reporting date if counterparties failed to perform as contracted. See Note 7 for a discussion of counterparty risk associated with the Company’s derivative transactions.
We perform an ongoing analysis of our loan portfolio to evaluate whether there is any significant exposure to any concentrations of credit risk. Based on this analysis, we believe that the loan portfolio is generally well diversified; however, there are certain significant concentrations in CRE and energy-related lending. Further, we cannot guarantee that we have fully understood or mitigated all risk concentrations or correlated risks. We have adopted and adhere to concentration limits on various types of CRE lending, particularly construction and land development lending, leveraged and enterprise value lending, municipal lending, and energy-related lending. All of these limits are continually monitored and revised as necessary.
Purchased Loans
Background and Accounting
We purchase loans in the ordinary course of business and account for them and the related interest income based on their performing status at the time of acquisition. PCI loans have evidence of credit deterioration at the time of acquisition and it is probable that not all contractual payments will be collected. Interest income for PCI loans is accounted for on an expected cash flow basis. Certain other loans acquired by the Company that are not credit-impaired include loans with revolving privileges and are excluded from the PCI tabular disclosures following. Interest income for these loans is accounted for on a contractual cash flow basis. Upon acquisition, in accordance with applicable accounting guidance, the acquired loans were recorded at their fair value without a corresponding ALLL. Certain acquired loans with similar characteristics such as risk exposure, type, size, etc., are grouped and accounted for in loan pools.
Outstanding Balances and Accretable Yield
The outstanding balances of all required payments and the related carrying amounts for PCI loans are as follows:
(In thousands)	March 31,			December 31,
	2015			2014
Commercial	$	96,157		$	104,942
Commercial real estate	105,234			118,217
Consumer	17,129			17,910
Outstanding balance	$	218,520		$	241,069
Carrying amount	$	162,890		$	179,299
Less ALLL	1,438			2,800
Carrying amount, net	$	161,452		$	176,499
At the time of acquisition of PCI loans, we determine the loan’s contractually required payments in excess of all cash flows expected to be collected as an amount that should not be accreted (nonaccretable difference). With respect to the cash flows expected to be collected, the portion representing the excess of the loan’s expected cash flows over our initial investment (accretable yield) is accreted into interest income on a level yield basis over the remaining expected life of the loan or pool of loans. The effects of estimated prepayments are considered in estimating the expected cash flows.
Certain PCI loans are not accounted for as previously described because the estimation of cash flows to be collected involves a high degree of uncertainty. Under these circumstances, the accounting guidance provides that interest income is recognized on a cash basis similar to the cost recovery methodology for nonaccrual loans. The net carrying amounts in the preceding schedule also include the amounts for these loans, which were not significant at March 31, 2015 and were $5.3 million at December 31, 2014.
Changes in the accretable yield for PCI loans were as follows:
(In thousands)	Three Months Ended
	March 31,
	2015			2014
Balance at beginning of period	$	45,055		$	77,528
Accretion	(9,583		)	(22,307		)
Reclassification from nonaccretable difference	13,281			8,920
Disposals and other	2,178			1,624
Balance at end of period	$	50,931		$	65,765
Note: Amounts have been adjusted based on refinements to the original estimates of the accretable yield.
The primary drivers of reclassification to accretable yield from nonaccretable difference and increases in disposals and other resulted primarily from (1) changes in estimated cash flows, (2) unexpected payments on nonaccrual loans, and (3) recoveries on zero balance loans pools. See subsequent discussion under changes in cash flow estimates.
ALLL Determination
For all acquired loans, the ALLL is only established for credit deterioration subsequent to the date of acquisition and represents our estimate of the inherent losses in excess of the book value of acquired loans. The ALLL for acquired loans is included in the overall ALLL in the balance sheet.
During the three months ended March 31, 2015, and 2014, we adjusted the ALLL for acquired loans by recording a negative provision for loan losses of $(0.8) million and $(2.7) million, respectively. The provision is net of the ALLL reversals discussed subsequently.
Changes in the provision for loan losses and related ALLL are driven in large part by the same factors that affect the changes in reclassification from nonaccretable difference to accretable yield, as discussed under changes in cash flow estimates.
Changes in Cash Flow Estimates
Over the life of the loan or loan pool, we continue to estimate cash flows expected to be collected. We evaluate quarterly at the balance sheet date whether the estimated present values of these loans using the effective interest rates have decreased below their carrying values. If so, we record a provision for loan losses.
For increases in carrying values that resulted from better-than-expected cash flows, we use such increases first to reverse any existing ALLL. During the three months ended March 31, total reversals to the ALLL, including the impact of increases in estimated cash flows, were $1.4 million in 2015 and $2.9 million in 2014, respectively. When there is no current ALLL, we increase the amount of accretable yield on a prospective basis over the remaining life of the loan and recognize this increase in interest income. Changes that increase cash flows have been due primarily to (1) the enhanced economic status of borrowers compared to original evaluations, (2) improvements in the Southern California market where the majority of these loans were originated, and (3) efforts by our credit officers and loan workout professionals to resolve problem loans.
For the three months ended March 31, the impact of increased cash flow estimates recognized in the statement of income for acquired loans with no ALLL was approximately $7.4 million in 2015 and $18.5 million in 2014, respectively, of additional interest income.

Derivative_Instruments_And_Hed

Derivative Instruments And Hedging Activities	3 Months Ended
	Mar. 31, 2015
Summary of Derivative Instruments [Abstract]
Derivative Instruments And Hedging Activities
		DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
	Objectives
	Our objectives in using derivatives are to add stability to interest income or expense, to modify the duration of specific assets or liabilities as we consider advisable, to manage exposure to interest rate movements or other identified risks, and/or to directly offset derivatives sold to our customers. To accomplish these objectives, we use interest rate swaps as part of our cash flow hedging strategy. These derivatives are used to hedge the variable cash flows associated with designated commercial loans.
	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 principal amount. Derivatives not designated as accounting hedges, including basis swap agreements, 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 10 discusses the process to estimate fair value for derivatives. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative and the resulting designation. Derivatives used to hedge the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives used to hedge the exposure to variability in expected cash flows, or other types of forecasted transactions, are considered cash flow hedges. Derivatives used to manage the exposure to risk are considered credit derivatives. When put in place after purchase of the asset(s) to be protected, these derivatives generally may not be designated as accounting 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 are being amortized into earnings, as discussed subsequently.
	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.
	No derivatives have been designated for hedges of investments in foreign operations.
	We assess the effectiveness of each hedging relationship by comparing the changes in fair value or cash flows on the derivative hedging instrument with the changes in fair value or cash flows on the designated hedged item or transaction. For derivatives not designated as accounting hedges, changes in fair value are recognized in earnings.
	The remaining balances of any derivative instruments terminated prior to maturity, including amounts in accumulated other comprehensive income (“AOCI”) for swap hedges, are accreted or amortized to interest income or expense over the period to their previously stated maturity dates.
	Amounts in AOCI are reclassified to interest income as interest is earned on variable rate loans and as amounts for terminated hedges are accreted or amortized to earnings. For the 12 months following March 31, 2015, we estimate that an additional $3.4 million will be reclassified.
	Collateral and Credit Risk
	Exposure to credit risk arises from the possibility of nonperformance by counterparties. Financial institutions which are well capitalized and well established are the counterparties for those derivatives entered into for asset liability management and to offset derivatives sold to our customers. The Company reduces its counterparty exposure for derivative contracts by centrally clearing all eligible derivatives.
	For those derivatives that are not centrally cleared, the counterparties are typically financial institutions or customers of the Company. For those that are financial institutions, we manage our credit exposure through the use of a Credit Support Annex (“CSA”) to International Swaps and Derivative Association (“ISDA”) master agreements. Eligible collateral types are documented by the CSA and are controlled under the Company’s general credit policies and 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 “hedged” by offsetting 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 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 March 31, 2015, the fair value of our derivative liabilities was $81.1 million, for which we were required to pledge cash collateral of approximately $65.8 million in the normal course of business. If our credit rating were downgraded one notch by either Standard & Poor’s or Moody’s at March 31, 2015, the additional amount of collateral we could be required to pledge is approximately $1.8 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 March 31, 2015 and December 31, 2014, and the related gain (loss) of derivative instruments for the three months ended March 31, 2015 and 2014 is summarized as follows:
		March 31, 2015						December 31, 2014
		Notional		Fair value				Notional		Fair value
	(In thousands)	amount		Other		Other		amount		Other		Other
				assets		liabilities				assets		liabilities
	Derivatives designated as hedging instruments
	Cash flow hedges:
	Interest rate swaps	$	300,000	$	4,623	$	—	$	275,000	$	1,508	$	123
	Total derivatives designated as hedging instruments	300,000		4,623		—		275,000		1,508		123
	Derivatives not designated as hedging instruments
	Interest rate swaps for customers 2	3,048,760		58,982		62,452		2,770,052		48,287		50,669
	Foreign exchange	355,708		20,373		18,671		443,721		16,625		15,272
	Total derivatives not designated as hedging instruments	3,404,468		79,355		81,123		3,213,773		64,912		65,941
	Total derivatives	$	3,704,468	$	83,978	$	81,123	$	3,488,773	$	66,420	$	66,064
		Three Months Ended March 31, 2015								Three Months Ended March 31, 2014
		Amount of derivative gain (loss) recognized/reclassified
	(In thousands)	OCI		Reclassified		Noninterest		Offset to		OCI		Reclassified		Noninterest			Offset to
				from AOCI		income		interest				from AOCI		income			interest
				to interest		(expense)		expense				to interest		(expense)			expense
				income 3								income 3
	Derivatives designated as hedging instruments
	Asset derivatives
	Cash flow hedges 1:
	Interest rate swaps	$	4,253	$	1,016	$	—			$	538	$	351	$	—
		4,253		1,016		—				538		351		—
	Liability derivatives
	Fair value hedges:
	Terminated swaps on long-term debt							$	468								$	718
	Total derivatives designated as hedging instruments	4,253		1,016		—		468		538		351		—			718
	Derivatives not designated as hedging instruments
	Interest rate swaps					—								6
	Interest rate swaps for customers 2					517								(549		)
	Futures contracts					1								—
	Foreign exchange					2,735								1,711
	Total return swap					—								(7,427		)
	Total derivatives not designated as hedging instruments					3,253								(6,259		)
	Total derivatives	$	4,253	$	1,016	$	3,253	$	468	$	538	$	351	$	(6,259	)	$	718
	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.
	2	Amounts include both the customer swaps and the offsetting derivative contracts.
	3	Amounts for the three months ended March 31, 2015 and 2014 of $1.0 million and $0.4 million, respectively, are the amounts of reclassification to earnings from AOCI presented in Note 8.
	At March 31, the fair values of derivative assets and liabilities were reduced by net credit valuation adjustments of $3.3 million and $0.1 million in 2015, and $1.6 million and $1.2 million in 2014, respectively. These adjustments are required to reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk.

Debt_And_Shareholders_Equity

Debt And Shareholders' Equity	3 Months Ended
	Mar. 31, 2015
Capitalization, Long-term Debt and Equity [Abstract]
Debt And Shareholders' Equity	DEBT AND SHAREHOLDERS’ EQUITY
	Long-term debt is summarized as follows:
	(In thousands)	March 31, 2015				December 31, 2014
	Junior subordinated debentures related to trust preferred securities	$	168,043			$	168,043
	Convertible subordinated notes	138,002				132,838
	Subordinated notes	335,341				335,798
	Senior notes	424,901				432,385
	FHLB advances	22,009				22,156
	Capital lease obligations and other	1,025				1,062
	Total	$	1,089,321			$	1,092,282
	The preceding carrying values represent the par value of the debt adjusted for any unamortized premium or discount or other basis adjustments, including the value of associated hedges.
	Maturities of long-term debt in 2015 include the following:
		Coupon		Carrying value
	(Amounts in thousands)	rate		March 31, 2015				Maturity
	Convertible subordinated note	6.00%		$	73,397			September 15, 2015
	Subordinated note	6.00%		32,706				September 15, 2015
	Convertible subordinated note	5.50%		64,606				November 16, 2015
	Subordinated note	5.50%		52,744				November 16, 2015
				$	223,453
	In addition, at March 31, 2015, we have optional early redemptions totaling $30.3 million for long-term senior notes as follows: $19.2 million on May 30, 2015 and $11.1 million on June 30, 2016. We have given notice that we will redeem in full the $19.2 million of senior notes. During the first quarter of 2015, we redeemed $8 million of senior notes.
	Basel III Capital Framework
	Effective January 1, 2015, we adopted the new Basel III capital framework that was issued by the Federal Reserve for U.S. banking organizations. We adopted the new capital rules on a 2015 phase-in basis and will adopt the fully phased-in requirements effective January 1, 2019. As of March 31, 2015, we made the “opt-out” election with respect to the regulatory capital treatment of AOCI under the Basel III framework.
	Among other things, the new rules revise capital adequacy guidelines and the regulatory framework for prompt corrective action, and they modify specified quantitative measures of our assets, liabilities, and capital. The impact of these new rules will require the Company to maintain capital in excess of current “well-capitalized” regulatory standards.
	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
	Three Months Ended March 31, 2015
	Balance at December 31, 2014		$	(91,921	)				$	2,226			$	(38,346	)	$	(128,041	)
	Other comprehensive income before reclassifications, net of tax		11,424						2,189				—			13,613
	Amounts reclassified from AOCI, net of tax		148						(629		)		—			(481		)
	Other comprehensive income		11,572						1,560				—			13,132
	Balance at March 31, 2015		$	(80,349	)				$	3,786			$	(38,346	)	$	(114,909	)
	Income tax expense included in other comprehensive income		$	6,957					$	1,088			$	—		$	8,045
	Three Months Ended March 31, 2014
	Balance at December 31, 2013		$	(168,805	)				$	1,556			$	(24,852	)	$	(192,101	)
	Other comprehensive income (loss) before reclassifications, net of tax		73,907						(2,521		)		—			71,386
	Amounts reclassified from AOCI, net of tax		(24,537		)				(210		)		—			(24,747		)
	Other comprehensive income (loss)		49,370						(2,731		)		—			46,639
	Balance at March 31, 2014		$	(119,435	)				$	(1,175	)		$	(24,852	)	$	(145,462	)
	Income tax expense (benefit) included in other comprehensive income (loss)		$	40,396					$	(1,683	)		$	—		$	38,713
		Amounts reclassified								Statement of income (SI) Balance sheet
		from AOCI 1								(BS)
	(In thousands)	Three Months Ended
		March 31,
	Details about AOCI components	2015				2014						Affected line item
	Net realized gains (losses) on investment securities	$	(239	)		$	30,914			SI		Fixed income securities gains (losses), net
	Income tax expense (benefit)	(91		)		6,074
		(148		)		24,840
	Net unrealized losses on investment	—				(27		)		SI		Net impairment losses on investment securities
	securities
	Income tax benefit	—				(10		)
		—				(17		)
	Accretion of securities with noncredit-related impairment losses not expected to be sold	—				(482		)		BS		Investment securities, held-to-maturity
	Deferred income taxes	—				196				BS		Other assets
		$	(148	)		$	24,537
	Net unrealized gains on derivative instruments	$	1,016			$	351			SI		Interest and fees on loans
	Income tax expense	387				141
		$	629			$	210
	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.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes
		INCOME TAXES
	The income tax expense rate for the three months ended March 31, 2015 and 2014 was lower than the blended statutory rate of 38.25% primarily because of the nontaxability of certain income items.
	Net deferred tax assets were approximately $213 million at March 31, 2015 and $224 million at December 31, 2014. We evaluate net deferred tax assets on a regular basis to determine whether an additional valuation allowance is required. 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 March 31, 2015.

Fair_Value

Fair Value	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value	Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. To measure fair value, a hierarchy has been established that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs. This hierarchy uses three levels of inputs to measure the fair value of assets and liabilities as follows:
	Level 1 – Quoted prices in active markets for identical assets or liabilities in active markets that the Company has the ability to access;
	Level 2 – Observable inputs other than Level 1 including quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in less active markets, observable inputs other than quoted prices that are used in the valuation of an asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means; and
	Level 3 – Unobservable inputs supported by little or no market activity for financial instruments whose value is determined by pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.
	The level in the fair value hierarchy within which the fair value measurement is classified is determined based on the lowest level input that is significant to the fair value measure in its entirety. Market activity is presumed to be orderly in the absence of evidence of forced or disorderly sales, although such sales may still be indicative of fair value. Applicable accounting guidance precludes the use of blockage factors or liquidity adjustments due to the quantity of securities held by an entity.
	We use fair value to measure certain assets and liabilities on a recurring basis when fair value is the primary measure for accounting. Fair value is used on a nonrecurring basis to measure certain assets when adjusting carrying values, such as the application of lower of cost or fair value accounting, including recognition of impairment on assets. Fair value is also used when providing required disclosures for certain financial instruments.
	Fair Value Policies and Procedures
	We have various policies, processes and controls in place to ensure that fair values are reasonably developed, reviewed and approved for use. These include a Securities Valuation Committee (“SVC”) comprised of executive management appointed by the Board of Directors. The SVC reviews and approves on a quarterly basis the key components of fair value estimation, including critical valuation assumptions for Level 3 modeling. Attribution analyses are completed when significant changes occur between quarters. The SVC also requires quarterly back testing of certain significant assumptions. 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 provide pricing for approximately 90% of our AFS Level 2 securities, and an internal model to estimate fair value for approximately 98% of our AFS Level 3 securities. Fair values for the remaining AFS Level 2 and Level 3 securities generally use standard form discounted cash flow modeling with certain inputs corroborated by market data.
	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.
	For Level 3 securities, we review and evaluate on a quarterly basis the relevant modeling assumptions. These include PDs, LGD rates, over-collateralization levels, and rating transition probability matrices from ratings agencies. In addition, we also compare the results and valuation with our information about market trends and trading data. This includes information regarding trading prices, implied discounts, outlier information, valuation assumptions, etc.
	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 and Trading
	U.S. Treasury, Agencies and Corporations
	U.S. Treasury securities are measured under Level 1 using quoted market prices. 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 using the third party pricing service, or under Level 3 using a discounted cash flow approach. Valuation inputs include Baa municipal curves, as well as FHLB and London Interbank Offered Rate (“LIBOR”) swap curves. Additional valuation inputs include internal credit scoring, and security- and client-type groupings.
	Asset-Backed Securities: Trust Preferred Collateralized Debt Obligations
	The majority of the CDO portfolio is measured under Level 3 primarily with the internal model using an income-based cash flow modeling approach incorporating several methodologies. The Company inputs its own key valuation assumptions:
	Trust preferred – banks and insurance: We primarily use an internal model for our bank and insurance CDO securities. Our “ratio-based approach” utilizes a statistical regression of regulatory ratios we have identified as predictive of future bank failures and bank holding company defaults to create a credit-specific PD for each bank issuer. The approach generally references trailing quarter regulatory data, financial ratios and macroeconomic factors.
	The PDs used depend on whether the collateral is performing or deferring. Deferring PDs increase, all else being equal, as the deferral ages and approaches the end of its allowable five-year deferral period. The internal model includes the expectation that deferrals that do not default will pay their contractually required back interest and return to a current status at the end of five years. Estimates of loss for the individual pieces of underlying collateral are aggregated to arrive at a pool-level loss rate for each CDO. These loss assumptions are applied to the CDO’s structure to generate cash flow projections for each tranche of the CDO.
	We utilize a present value technique to identify both the OTTI present in the CDO tranches and to estimate fair value. To estimate fair value, we discount the credit-adjusted cash flows of each CDO tranche at a tranche-specific discount rate derived from trading data and a measure of the credit risk in the CDO tranche. Because these securities are not traded on exchanges and trading prices are not posted on the TRACE® system (Trade Reporting and Compliance Engine®), we seek information from market participants to obtain trade price information.
	Trading data is generally limited and may include trades of tranches within our same CDO. We use this limited trade data along with our modeled expected credit-adjusted cash flows to determine a relationship between the market required yield and the downside variability of the returns of each CDO security. The downside variability for this purpose is a measure of the downside variability of cash flows from the mean estimate of cash flow.
	In addition to the trust preferred CDOs, we hold two single-name bank trust preferred securities, which were both transferred to Level 2 from Level 3 during the first quarter of 2014.
	Mutual funds and other
	Mutual funds and other securities are measured under Level 1 or Level 2. For Level 1, quoted market prices are used which may include net asset values or their equivalents. Level 2 valuations generally use quoted prices for similar securities.
	Trading account
	Securities in the trading account are measured under Level 1 using quoted market prices. If not available, quoted prices under Level 2 for similar securities are used.
	Bank-Owned Life Insurance
	Bank-owned life insurance is measured under Level 2 according to cash surrender values (“CSVs”) of the insurance policies that are provided by a third party service. Nearly all policies are general account policies with CSVs based on the Company’s claims on the assets of the insurance companies. The insurances companies’ investments include predominantly fixed income securities consisting of investment-grade corporate bonds and various types of mortgage instruments. Average duration ranges from five to eight years. Management regularly reviews investment performance, including concentrations of investments and regulatory restrictions.
	Private Equity Investments
	Private equity investments are measured under Level 3. The Equity Investments Committee, consisting of executives familiar with the investments, reviews periodic financial information, including audited financial statements when available. Certain analytics may be employed that include current and projected financial performance, recent financing activities, economic and market conditions, market comparables, market liquidity, sales restrictions, and other factors. The amount of unfunded commitments to invest is disclosed in Note 11. Certain restrictions apply for the redemption of these investments and certain investments are prohibited by the Volcker Rule. See discussions in Notes 5 and 11.
	Agriculture Loan Servicing
	This asset results from our servicing of agriculture loans approved and funded by FAMC. We provide this servicing under an agreement with Farmer Mac for loans they own. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies.
	Interest-Only Strips
	Interest-only strips are created as a by-product of the securitization process. When the guaranteed portions of SBA 7(a) loans are pooled, interest-only strips may be created in the pooling process. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies.
	Deferred Compensation Plan Assets and Obligations
	Invested assets in the deferred compensation plan consist of shares of registered investment companies. These mutual funds are valued under Level 1 at quoted market prices, which represents the NAV of shares held by the plan at the end of the period.
	Derivatives
	Derivatives are measured according to their classification as either exchange-traded or over-the-counter (“OTC”). Exchange-traded derivatives consist of forward currency exchange contracts measured under Level 1 because they are traded in active markets. OTC derivatives, including those for customers, consist of interest rate swaps and options. These derivatives are measured under Level 2 using third party services. Observable market inputs include yield curves (the LIBOR swap curve and relevant overnight index swap curves), foreign exchange rates, commodity prices, option volatilities, counterparty credit risk, and other related data. Credit valuation adjustments are required to reflect nonperformance risk for both the Company and the respective counterparty. These adjustments are determined generally by applying a credit spread to the total expected exposure of the derivative.
	Securities Sold, Not Yet Purchased
	Securities sold, not yet purchased, included in “Federal funds and other short-term borrowings” on the balance sheet, are measured under Level 1 using quoted market prices. If not available, quoted prices under Level 2 for similar securities are used.
	Quantitative Disclosure of Fair Value Measurements
	Assets and liabilities measured at fair value by class on a recurring basis are summarized as follows:
	(In thousands)	March 31, 2015
		Level 1				Level 2			Level 3				Total
	ASSETS
	Investment securities:
	Available-for-sale:
	U.S. Treasury, agencies and corporations	$	—			$	3,655,221		$	—			$	3,655,221
	Municipal securities					173,145			2,465				175,610
	Asset-backed securities:
	Trust preferred – banks and insurance					23,179			438,338				461,517
	Other					638			4,826				5,464
	Mutual funds and other	124,443				28,247							152,690
		124,443				3,880,430			445,629				4,450,502
	Trading account					71,392							71,392
	Other noninterest-bearing investments:
	Bank-owned life insurance					478,926							478,926
	Private equity								107,448				107,448
	Other assets:
	Agriculture loan servicing and interest-only strips								12,001				12,001
	Deferred compensation plan assets	91,368											91,368
Derivatives:
Interest rate related and other					5,408							5,408
Interest rate swaps for customers					58,982							58,982
Foreign currency exchange contracts	20,373											20,373
	20,373				64,390			—				84,763
	$	236,184			$	4,495,138		$	565,078			$	5,296,400
LIABILITIES
Securities sold, not yet purchased	$	6,749			$	—		$	—			$	6,749
Other liabilities:
Deferred compensation plan obligations	91,368											91,368
Derivatives:
Interest rate related and other					176							176
Interest rate swaps for customers					62,452							62,452
Foreign currency exchange contracts	18,671											18,671
	18,671				62,628			—				81,299
	$	116,788			$	62,628		$	—			$	179,416
(In thousands)	December 31, 2014
	Level 1				Level 2			Level 3				Total
ASSETS
Investment securities:
Available-for-sale:
U.S. Treasury, agencies and corporations	$	—			$	3,098,208		$	—			$	3,098,208
Municipal securities					185,093			4,164				189,257
Asset-backed securities:
Trust preferred – banks and insurance					22,701			393,007				415,708
Auction rate								4,761				4,761
Other					666			25				691
Mutual funds and other	105,348				30,275							135,623
	105,348				3,336,943			401,957				3,844,248
Trading account					70,601							70,601
Other noninterest-bearing investments:
Bank-owned life insurance					476,290							476,290
Private equity								99,865				99,865
Other assets:
Agriculture loan servicing and interest-only strips								12,227				12,227
Deferred compensation plan assets	88,878											88,878
Derivatives:
Interest rate related and other					1,508							1,508
Interest rate swaps for customers					48,287							48,287
Foreign currency exchange contracts	16,625											16,625
	16,625				49,795			—				66,420
	$	210,851			$	3,933,629		$	514,049			$	4,658,529
LIABILITIES
Securities sold, not yet purchased	$	24,230			$	—		$	—			$	24,230
Other liabilities:
Deferred compensation plan obligations	88,878											88,878
Derivatives:
Interest rate related and other					297							297
Interest rate swaps for customers					50,669							50,669
Foreign currency exchange contracts	15,272											15,272
	15,272				50,966			—				66,238
Other								13				13
	$	128,380			$	50,966		$	13			$	179,359
The fair value of the Level 3 bank and insurance CDO portfolio would generally be adversely affected by significant increases in the constant default rate (“CDR”) for performing collateral, the loss percentage expected from deferring collateral, and the discount rate used. The fair value of the portfolio would generally be positively affected by increases in interest rates and prepayment rates. For a specific tranche within a CDO, the directionality of the fair value change for a given assumption change may differ depending on the seniority level of the tranche. For example, faster prepayment may increase the fair value of a senior most tranche of a CDO while decreasing the fair value of a more junior tranche.
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
	Three Months Ended March 31, 2015
(In thousands)	Municipal				Trust			Trust				Other				Private			Ag loan svcg and int-only strips			Derivatives
	securities				preferred – banks and insurance			preferred								equity						and other
								– REIT								investments						liabilities
Balance at December 31, 2014	$	4,164			$	393,007		$	—			$	4,786			$	99,865		$	12,227		$	(13	)
Net gains (losses) included in:
Statement of income:
Accretion of purchase discount on securities available-for-sale	2				257
Dividends and other investment income																1,074
Equity securities losses, net																3,253
Fixed income securities gains (losses), net	31				(323		)
Other noninterest income																			4
Other noninterest expense																						13
Other comprehensive income (loss)	127				(6,949		)					42
Fair value of HTM securities reclassified as AFS					57,308
Purchases																5,052			171
Sales					(2,613		)									(1,517		)
Redemptions and paydowns	(1,859		)		(2,349		)					(2		)		(279		)	(401		)
Balance at March 31, 2015	$	2,465			$	438,338		$	—			$	4,826			$	107,448		$	12,001		$	—
	Level 3 Instruments
	Three Months Ended March 31, 2014
(In thousands)	Municipal				Trust			Trust				Auction				Other			Private			Ag loan svcg and int-only strips			Derivatives
	securities				preferred – banks and insurance			preferred – REIT				rate				asset-backed			equity						and other
																			investments						liabilities
Balance at December 31, 2013	$	10,662			$	1,238,820		$	22,996			$	6,599			$	25,800		$	82,410		$	8,852		$	(4,303	)
Net gains (losses) included in:
Statement of income:
Accretion of purchase discount on securities available-for-sale	10				720							1
Dividends and other investment income																			(1,695		)
Fair value and nonhedge derivative loss																									(7,427		)
Fixed income securities gains, net	16				18,582			1,399								10,917
Other noninterest income																						481
Other noninterest expense																									8
Other comprehensive income (loss)	(274		)		94,462							(40		)		(15		)
Purchases																			1,356			2,077
Sales					(546,388		)	(24,395		)						(36,669		)	(824		)
Redemptions and paydowns	(230		)		(46,786		)									(3		)	(195		)	(203		)	6,090
Transfers to Level 2					(69,193		)
Balance at March 31, 2014	$	10,184			$	690,217		$	—			$	6,560			$	30		$	81,052		$	11,207		$	(5,632	)
The preceding reconciling amounts using Level 3 inputs include the following realized amounts in the statement of income:
	(In thousands)	Three Months Ended March 31,
		2015				2014
	Dividends and other investment income	$	—			$	34
	Fixed income securities gains (losses), net	(292		)		30,914
Except as previously discussed, no other transfers of assets or liabilities occurred among Levels 1, 2 or 3 for the three months ended March 31, 2015 and 2014. Transfers are considered to have occurred as of the end of the reporting period.
Following is a summary of quantitative information relating to the principal valuation techniques and significant unobservable inputs for Level 3 instruments measured on a recurring and nonrecurring basis:
	Level 3 Instruments
	Quantitative information at March 31, 2015
(Dollar amounts in thousands)	Fair value				Principal valuation techniques		Significant unobservable inputs	Range of inputs
								(% annually)
Asset-backed securities:
Trust preferred – predominantly banks	$	438,338			Discounted cash flow		Constant prepayment rate	until maturity – 2.0%
					Market comparables
							Constant default rate	yr 1 – 0.3% to 0.5%
								yrs 2-5 – 0.5% to 0.7%
								yrs 6 to maturity – 0.6% to 0.7%
							Loss given default	100%
							Loss given deferral	11.9% to 100%
							Discount rate	3.7% to 5.4%
							(spread over forward LIBOR)
	Level 3 Instruments
	Quantitative information at December 31, 2014
(Dollar amounts in thousands)	Fair value				Principal valuation techniques		Significant unobservable inputs	Range of inputs
								(% annually)
Asset-backed securities:
Trust preferred – predominantly banks	$	393,007			Discounted cash flow		Constant prepayment rate	until maturity – 2.0%
					Market comparables
							Constant default rate	yr 1 – 0.3% to 0.8%
								yrs 2-5 – 0.5% to 0.9%
								yrs 6 to maturity – 0.6% to 0.7%
							Loss given default	100%
							Loss given deferral	14.5% to 100%
							Discount rate	3.4% to 5.6%
							(spread over forward LIBOR)
Nonrecurring Fair Value Measurements
Included in the balance sheet amounts are the following amounts of assets that had fair value changes during the year-to-date period measured on a nonrecurring basis.
(In thousands)	Fair value at March 31, 2015															Fair value at December 31, 2014
	Level 1				Level 2			Level 3				Total				Level 1			Level 2			Level 3			Total
ASSETS
Private equity investments, carried at cost	$	—			$	—		$	1,997			$	1,997			$	—		$	—		$	23,454		$	23,454
Impaired loans	—				9,793			—				9,793				—			20,494			—			20,494
Other real estate owned	—				2,886			—				2,886				—			8,034			—			8,034
	$	—			$	12,679		$	1,997			$	14,676			$	—		$	28,528		$	23,454		$	51,982
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.
	Gains (losses) from fair value changes
(In thousands)	Three Months Ended
	March 31,
	2015				2014
ASSETS
HTM securities adjusted for OTTI	$	—			$	(27	)
Private equity investments, carried at cost	(1,153		)		—
Impaired loans	(4,487		)		(2,177		)
Other real estate owned	(1,008		)		(2,234		)
	$	(6,648	)		$	(4,438	)
During the three months ended March 31, we recognized net gains of $0.7 million in 2015 and $1.0 million in 2014 from the sale of other real estate owned (“OREO”) properties that had a carrying value at the time of sale of approximately $4.1 million and $10.0 million, respectively. Previous to their sale in these periods, we recognized impairment on these properties of an insignificant amount in 2015 and $0.2 million in 2014.
HTM securities adjusted for OTTI were measured at fair value using the same methodology for trust preferred CDO securities.
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 private equity investments carried at cost were $33.3 million at March 31, 2015 and $39.1 million at December 31, 2014. Amounts of other noninterest-bearing investments carried at cost were $250.5 million at March 31, 2015 and $250.7 million at December 31, 2014, which were comprised of Federal Reserve, Federal Home Loan Bank, and Farmer Mac stock.
Impaired (or nonperforming) loans that are collateral-dependent were measured at fair value based on the fair value of the collateral. OREO was measured initially at fair value based on property appraisals at the time of transfer and subsequently at the lower of cost or fair value.
Measurement of fair value for collateral-dependent loans and OREO was based on third party appraisals that utilize one or more valuation techniques (income, market and/or cost approaches). Any adjustments to calculated fair value were made based on recently completed and validated third party appraisals, third party appraisal services, automated valuation services, or our informed judgment. Evaluations were made to determine that the appraisal process met the relevant concepts and requirements of applicable accounting guidance.
Automated valuation services may be used primarily for residential properties when values from any of the previous methods were not available within 90 days of the balance sheet date. These services use models based on market, economic, and demographic values. The use of these models has only occurred in a very few instances and the related property valuations have not been significant to consider disclosure under Level 3 rather than Level 2.
Impaired loans not collateral-dependent were measured at fair valued 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:
	March 31, 2015									December 31, 2014
(In thousands)	Carrying				Estimated			Level		Carrying				Estimated				Level
	value				fair value					value				fair value
Financial assets:
HTM investment securities	$	590,950			$	602,355		3		$	647,252			$	677,196			3
Loans and leases (including loans held for sale), net of allowance	39,689,047				39,573,365			3		39,591,499				39,426,498				3
Financial liabilities:
Time deposits	2,344,818				2,349,454			2		2,406,924				2,408,550				2
Foreign deposits	382,985				382,873			2		328,391				328,447				2
Long-term debt (less fair value hedges)	1,088,285				1,149,869			2		1,090,778				1,159,287				2
This summary excludes financial assets and liabilities for which carrying value approximates fair value. For financial assets, these include cash and due from banks and money market investments. For financial liabilities, these include demand, savings and money market deposits, and federal funds purchased and security repurchase agreements. The estimated fair value of demand, savings and money market deposits is the amount payable on demand at the reporting date. Carrying value is used because the accounts have no stated maturity and the customer has the ability to withdraw funds immediately. Also excluded from the summary are financial instruments recorded at fair value on a recurring basis, as previously described.
HTM investment securities primarily consist of municipal securities and, through December 31, 2014, bank and insurance trust preferred CDOs. They were measured at fair value according to the methodologies previously discussed for these investment types.
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 are already considered to be held at fair value, except those whose fair value is determined by discounting cash flows, as discussed previously. 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.

Commitments_Guarantees_And_Con

Commitments, Guarantees, And Contingent Liabilities	3 Months Ended
	Mar. 31, 2015
Guarantees, Commitments And Contingencies [Abstract]
Guarantees, Commitments And Contingencies	COMMITMENTS, GUARANTEES AND CONTINGENT LIABILITIES
	Commitments and Guarantees
	Contractual amounts of off-balance sheet financial instruments used to meet the financing needs of our customers are as follows:
	(In thousands)	March 31,		December 31,
		2015		2014
	Net unfunded commitments to extend credit 1	$	16,528,689	$	16,658,757
	Standby letters of credit:
	Financial	753,853		745,895
	Performance	191,753		183,482
	Commercial letters of credit	68,807		32,144
	Total unfunded lending commitments	$	17,543,102	$	17,620,278
	1	Net of participations
	The Company’s 2014 Annual Report on Form 10-K contains further information about these commitments and guarantees including their terms and collateral requirements. At March 31, 2015, the Company had recorded approximately $15.0 million as a liability for the guarantees associated with the standby letters of credit, which consisted of $12.0 million attributable to the RULC and $3.0 million of deferred commitment fees.
	At March 31, 2015, the Parent has guaranteed $15.0 million of debt of affiliated trusts issuing trust preferred securities.
	At March 31, 2015, we had unfunded commitments for private equity investments of approximately $35 million. These obligations have no stated maturity. Certain PEIs related to these commitments are prohibited by the Volcker Rule. See related discussions about these investments in Notes 5 and 10.
	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 March 31, 2015, we were subject to the following material litigation and governmental inquiries:
	•	a class action case, Reyes v. Zions First National Bank, et. al., which was brought in the United States District Court for the Eastern District of Pennsylvania. This case relates to our banking relationships with customers that allegedly engaged in wrongful telemarketing practices. The plaintiff is seeking a trebled monetary award under the federal RICO Act. In the third quarter of 2013, the District Court denied the plaintiff’s motion for class certification in the Reyes case. The plaintiff appealed the District Court decision to the Third Circuit Court of Appeals. The Third Circuit had not ruled on the appeals as of May 2015.
	•	a governmental inquiry into possible money laundering activities of a customer of one of our subsidiary banks and the anti-money laundering practices of that bank (conducted by the United States Attorney’s Office for the Southern District of New York). We are unclear about the status of this inquiry.
	•	a governmental inquiry into the practices of our subsidiary, Zions Bank; our former subsidiary, NetDeposit, LLC; and possibly other of our affiliates relating primarily to payment processing for allegedly fraudulent telemarketers and other customer types (conducted by the Department of Justice). This inquiry has been directed towards the banking industry generally, including numerous banks unrelated to us, and had led to a number of enforcement actions. We are unclear about the status of the inquiry as it relates to us.
	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 March 31, 2015, we estimated the aggregate range of reasonably possible losses for those matters to be from $0 million to roughly $50 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 an 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.

Retirement_Plans

Retirement Plans	3 Months Ended
	Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Retirement Plans
		RETIREMENT PLANS
	The following discloses the net periodic benefit cost (credit) and its components for the Company’s pension and postretirement plans:
			Pension benefits						Supplemental				Postretirement
									retirement				benefits
									benefits
	(In thousands)		Three Months Ended March 31,
			2015			2014			2015		2014		2015			2014
	Service cost		$	—		$	—		$	—	$	—	$	8		$	8
	Interest cost		1,783			1,880			101		113		10			12
	Expected return on plan assets		(3,090		)	(3,326		)
	Amortization of prior service cost										13
	Amortization of net actuarial (gain) loss		1,574			797			31		5		(13		)	(18		)
	Net periodic benefit cost (credit)		$	267		$	(649	)	$	132	$	131	$	5		$	2
	As disclosed in the Company’s 2014 Annual Report on Form 10-K, the Company has frozen its participation and benefit accruals for the pension plan and its contributions for individual benefit payments in the postretirement benefit plan.

Operating_Segment_Information

Operating Segment Information	3 Months Ended
	Mar. 31, 2015
Operating Segment Information [Abstract]
Operating Segment Information
	.	OPERATING SEGMENT INFORMATION
	We manage our operations and prepare management reports and other information with a primary focus on geographical area. As of March 31, 2015, we operate eight community/regional banks in distinct geographical areas. Performance assessment and resource allocation are based upon this geographical structure. Zions Bank operates 100 branches in Utah, 25 branches in Idaho, and one branch in Wyoming. CB&T operates 94 branches in California. Amegy operates 80 branches in Texas. NBAZ operates 66 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 the state of Washington. TCBO operates one branch in Oregon. Effective April 1, 2015, TCBO was merged into TCBW.
	The operating segment identified as “Other” includes the Parent, Zions Management Services Company (“ZMSC”), certain nonbank financial service subsidiaries, TCBO, and eliminations of transactions between segments. The Parent’s operations are significant to the Other segment. Net interest income is substantially affected by the Parent’s interest on long-term debt. ZMSC provides internal technology and operational services to affiliated operating businesses of the Company. ZMSC charges most of its costs to the affiliates on an approximate break-even basis.
	The accounting policies of the individual operating segments are the same as those of the Company. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations. Operating segments pay for centrally provided services based upon estimated or actual usage of those services.
	The following schedule presents selected operating segment information for the three months ended March 31, 2015 and 2014:
	(In millions)	Zions Bank						Amegy					CB&T						NBAZ						NSB
		2015			2014			2015		2014			2015			2014			2015			2014			2015			2014
	CONDENSED INCOME STATEMENT
	Net interest income	$	141.1		$	142.5		$	96.7	$	94.7		$	95.7		$	109.2		$	39		$	40.3		$	28		$	27.9
	Provision for loan losses	(4.6		)	(8.7		)	11.1		16.9			(4.1		)	(2.1		)	0.7			(3.0		)	(8.7		)	(2.6		)
	Net interest income after provision for loan losses	145.7			151.2			85.6		77.8			99.8			111.3			38.3			43.3			36.7			30.5
	Noninterest income	46.8			44			34		32			16.7			5.8			8.5			8.3			9			4.9
	Noninterest expense	127.4			121.5			94		87			74.4			85.3			36.9			37.3			32.1			32.1
	Income (loss) before income taxes	65.1			73.7			25.6		22.8			42.1			31.8			9.9			14.3			13.6			3.3
	Income taxes (benefit)	23.4			26.8			8.5		7.3			16.4			12.1			3.4			5.2			4.6			1
	Net income (loss)	41.7			46.9			17.1		15.5			25.7			19.7			6.5			9.1			9			2.3
	Net income (loss) applicable to noncontrolling interests	0.5			—			—		—			—			—			—			—			—			—
	Net income (loss) applicable to controlling interest	$	41.2		$	46.9		$	17.1	$	15.5		$	25.7		$	19.7		$	6.5		$	9.1		$	9		$	2.3
	AVERAGE BALANCE SHEET DATA
	Total assets	$	18,573		$	18,275		$	13,964	$	13,467		$	11,368		$	10,889		$	4,825		$	4,612		$	4,164		$	3,991
	Cash and due from banks	297			339			183		322			90			166			49			72			71			88
	Money market investments	2,968			3,546			2,046		2,503			1,659			1,129			396			289			734			700
	Total securities	2,468			1,596			285		242			337			327			412			365			840			781
	Total loans	12,180			12,247			10,276		9,362			8,502			8,538			3,764			3,696			2,384			2,306
	Total deposits	16,160			15,980			11,478		11,099			9,701			9,273			4,178			3,952			3,755			3,598
	Shareholder's equity:
	Preferred equity	280			280			226		153			162			162			85			120			50			50
	Common equity	1,633			1,538			1,940		1,849			1,394			1,350			485			422			332			318
	Noncontrolling interests	11			—			—		—			—			—			—			—			—			—
	Total shareholder's equity	1,924			1,818			2,166		2,002			1,556			1,512			570			542			382			368
		Vectra						TCBW					Other						Consolidated
																			Company
		2015			2014			2015		2014			2015			2014			2015			2014
	CONDENSED INCOME STATEMENT
	Net interest income	$	25.7		$	25.3		$	6.7	$	7		$	(15.5	)	$	(30.4	)	$	417.4		$	416.5
	Provision for loan losses	3.8			(1.8		)	0.1		0.7			0.2			—			(1.5		)	(0.6		)
	Net interest income after provision for loan losses	21.9			27.1			6.6		6.3			(15.7		)	(30.4		)	418.9			417.1
	Noninterest income	5			3.8			0.9		(1.0		)	0.9			40.5			121.8			138.3
	Noninterest expense	23.9			25.3			6.9		4.5			1.9			5.1			397.5			398.1
	Income (loss) before income taxes	3			5.6			0.6		0.8			(16.7		)	5			143.2			157.3
	Income taxes (benefit)	0.7			1.8			0.2		0.3			(6.0		)	1.6			51.2			56.1
	Net income (loss)	2.3			3.8			0.4		0.5			(10.7		)	3.4			92			101.2
	Net income (loss) applicable to noncontrolling interests	—			—			—		—			(0.5		)	—			—			—
	Net income (loss) applicable to controlling interest	$	2.3		$	3.8		$	0.4	$	0.5		$	(10.2	)	$	3.4		$	92		$	101.2
	AVERAGE BALANCE SHEET DATA
	Total assets	$	2,977		$	2,569		$	896	$	873		$	51		$	758		$	56,818		$	55,434
	Cash and due from banks	29			47			29		21			(4		)	(17		)	744			1,038
	Money market investments	339			14			119		118			(248		)	(159		)	8,013			8,140
	Total securities	191			164			71		90			179			552			4,783			4,117
	Total loans	2,358			2,280			661		631			54			65			40,179			39,125
	Total deposits	2,568			2,168			766		742			(1,122		)	(1,032		)	47,484			45,780
	Shareholder's equity:
	Preferred equity	25			70			3		3			173			166			1,004			1,004
	Common equity	317			247			90		88			214			(217		)	6,405			5,595
	Noncontrolling interests	—			—			—		—			(11		)	—			—			—
	Total shareholder's equity	342			317			93		91			376			(51		)	7,409			6,599

Basis_of_Presentaion_Organizat

Basis of Presentaion Organization and Presentation (Policies)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	BASIS OF PRESENTATION
	The accompanying unaudited consolidated financial statements of Zions Bancorporation (“the Parent”) and its majority-owned subsidiaries (collectively “the Company,” “Zions,” “we,” “our,” “us”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board (“FASB”) are made according to sections of the Accounting Standards Codification (“ASC”) and to Accounting Standards Updates (“ASU”), which include consensus issues of the Emerging Issues Task Force (“EITF”). In certain cases, ASUs are issued jointly with International Financial Reporting Standards (“IFRS”). Certain prior period amounts have been reclassified to conform with the current period presentation. These reclassifications did not affect net income.
	Operating results for the three months ended March 31, 2015 and 2014 are not necessarily indicative of the results that may be expected in future periods. The consolidated balance sheet at December 31, 2014 is from the audited financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s 2014 Annual Report on Form 10-K.
	The Company provides a full range of banking and related services through subsidiary banks in 11 Western and Southwestern states as follows: Zions First National Bank (“Zions Bank”), in Utah, Idaho and Wyoming; California Bank & Trust (“CB&T”); Amegy Corporation (“Amegy”) and its subsidiary, Amegy Bank, in Texas; National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“Vectra”), in Colorado and New Mexico; The Commerce Bank of Washington (“TCBW”); and The Commerce Bank of Oregon (“TCBO”). Effective April 1, 2015, TCBO was merged into TCBW. The Parent and its subsidiary banks also own and operate certain nonbank subsidiaries that engage in financial services.

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]
Schedule of Other Significant Noncash Transactions [Table Text Block]
	(In thousands)	Three Months Ended
		March 31,
		2015		2014
	Loans and leases transferred to other real estate owned	$	3,568	$	6,338
	Loans held for sale reclassified as loans and leases	13,138		3,789
	Amortized cost of HTM securities reclassified as AFS securities	79,276		—

Offsetting_Assets_and_Liabilit1

Offsetting Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Offsetting Assets and Liabilities [Abstract]
Fair Value, by Balance Sheet Grouping [Table Text Block]
			March 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		$	1,519,352		$	—		$	1,519,352		$	—		$	—		$	1,519,352
	Derivatives (included in other assets)		83,978			—			83,978			(5,121		)	—			78,857
			$	1,603,330		$	—		$	1,603,330		$	(5,121	)	$	—		$	1,598,209
	Liabilities:
	Federal funds and other short-term borrowings		$	203,597		$	—		$	203,597		$	—		$	—		$	203,597
	Derivatives (included in other liabilities)		81,123			—			81,123			(5,121		)	(38,833		)	37,169
			$	284,720		$	—		$	284,720		$	(5,121	)	$	(38,833	)	$	240,766
			December 31, 2014
	(In thousands)											Gross amounts not offset in the balance sheet
	Description		Gross amounts recognized			Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet			Financial instruments			Cash collateral received/pledged			Net amount
	Assets:
	Federal funds sold and security resell agreements		$	1,386,291		$	—		$	1,386,291		$	—		$	—		$	1,386,291
	Derivatives (included in other assets)		66,420			—			66,420			(3,755		)				62,665
			$	1,452,711		$	—		$	1,452,711		$	(3,755	)	$	—		$	1,448,956
	Liabilities:
	Federal funds and other short-term borrowings		$	244,223		$	—		$	244,223		$	—		$	—		$	244,223
	Derivatives (included in other liabilities)		66,064			—			66,064			(3,755		)	(31,968		)	30,341
			$	310,287		$	—		$	310,287		$	(3,755	)	$	(31,968	)	$	274,564
		March 31, 2015								December 31, 2014
	(In thousands)	Carrying			Estimated			Level		Carrying			Estimated			Level
		value			fair value					value			fair value
	Financial assets:
	HTM investment securities	$	590,950		$	602,355		3		$	647,252		$	677,196		3
	Loans and leases (including loans held for sale), net of allowance	39,689,047			39,573,365			3		39,591,499			39,426,498			3
	Financial liabilities:
	Time deposits	2,344,818			2,349,454			2		2,406,924			2,408,550			2
	Foreign deposits	382,985			382,873			2		328,391			328,447			2
	Long-term debt (less fair value hedges)	1,088,285			1,149,869			2		1,090,778			1,159,287			2

Investment_Securities_Tables

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2015																							Dec. 31, 2014
Investments [Abstract]
Summary Of Investment Securities
		March 31, 2015
	(In thousands)	Amortized			Gross				Gross			Estimated fair
		cost			unrealized				unrealized			value
					gains				losses
	Held-to-maturity
	Municipal securities	$	590,950		$	12,208			$	803		$	602,355
	Available-for-sale
	U.S. Government agencies and corporations:
	Agency securities	631,603			1,406				7,139			625,870
	Agency guaranteed mortgage-backed securities	1,417,843			16,441				614			1,433,670
	Small Business Administration loan-backed securities	1,588,562			15,677				8,558			1,595,681
	Municipal securities	175,017			1,282				689			175,610
	Asset-backed securities:
	Trust preferred securities – banks and insurance	611,836			99				150,418			461,517
	Other	5,229			235				—			5,464
		4,430,090			35,140				167,418			4,297,812
	Mutual funds and other	153,235			101				646			152,690
		4,583,325			35,241				168,064			4,450,502
	Total	$	5,174,275		$	47,449			$	168,867		$	5,052,857
		December 31, 2014
					Recognized in OCI 1											Not recognized in OCI
	(In thousands)	Amortized			Gross				Gross			Carrying				Gross			Gross			Estimated
		cost			unrealized				unrealized			value				unrealized			unrealized			fair
					gains				losses							gains			losses			value
	Held-to-maturity
	Municipal securities	$	607,675		$	—			$	—		$	607,675			$	13,018		$	804		$	619,889
	Asset-backed securities:
	Trust preferred securities – banks and insurance	79,276			—				39,699			39,577				18,393			663			57,307
		686,951			—				39,699			647,252				31,411			1,467			677,196
	Available-for-sale
	U.S. Government agencies and
	corporations:
	Agency securities	607,523			1,572				8,343			600,752										600,752
	Agency guaranteed mortgage-backed securities	935,164			12,132				2,105			945,191										945,191
	Small Business Administration loan-backed securities	1,544,710			16,446				8,891			1,552,265										1,552,265
	Municipal securities	189,059			1,143				945			189,257										189,257
	Asset-backed securities:
	Trust preferred securities – banks and insurance	537,589			103				121,984			415,708										415,708
	Other	5,252			207				7			5,452										5,452
		3,819,297			31,603				142,275			3,708,625										3,708,625
	Mutual funds and other	136,591			76				1,044			135,623										135,623
		3,955,888			31,679				143,319			3,844,248										3,844,248
	Total	$	4,642,839		$	31,679			$	183,018		$	4,491,500									$	4,521,444
	1	Other comprehensive income
Contractual Maturities Debt Securities
		Held-to-maturity							Available-for-sale
	(In thousands)	Amortized			Estimated				Amortized			Estimated
		cost			fair				cost			fair
					value							value
	Due in one year or less	$	96,220		$	97,409			$	639,077		$	638,407
	Due after one year through five years	188,507			191,799				1,719,501			1,718,550
	Due after five years through ten years	158,244			164,415				1,155,325			1,146,764
	Due after ten years	147,979			148,732				916,187			794,091
		$	590,950		$	602,355			$	4,430,090		$	4,297,812
Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value	The following is a summary of the amount of gross unrealized losses for investment securities and the estimated fair value by length of time the securities have been in an unrealized loss position:
		March 31, 2015																								December 31, 2014
		Less than 12 months							12 months or more							Total										Less than 12 months				12 months or more				Total
	(In thousands)	Gross			Estimated				Gross			Estimated				Gross			Estimated						(In thousands)	Gross		Estimated		Gross		Estimated		Gross		Estimated
		unrealized			fair				unrealized			fair				unrealized			fair							unrealized		fair		unrealized		fair		unrealized		fair
		losses			value				losses			value				losses			value							losses		value		losses		value		losses		value
	Held-to-maturity																								Held-to-maturity
	Municipal securities	$	722		$	93,203			$	81		$	3,831			$	803		$	97,034					Municipal securities	$	527	$	62,762	$	277	$	14,003	$	804	$	76,765
																									Asset-backed securities:
	Available-for-sale																								Trust preferred securities – banks and insurance	53		122		40,309		57,186		40,362		57,308
	U.S. Government agencies and corporations:
	Agency securities	2,631			139,038				4,508			287,134				7,139			426,172							580		62,884		40,586		71,189		41,166		134,073
	Agency guaranteed mortgage-backed securities	438			178,832				176			12,750				614			191,582						Available-for-sale
																									U.S. Government agencies and corporations:
	Small Business Administration loan-backed securities	4,551			460,629				4,007			264,312				8,558			724,941						Agency securities	4,510		295,694		3,833		101,188		8,343		396,882
	Municipal securities	129			28,134				560			2,916				689			31,050						Agency guaranteed mortgage-backed securities	1,914		425,114		191		12,124		2,105		437,238
	Asset-backed securities:																								Small Business Administration loan-backed securities	5,869		495,817		3,022		175,523		8,891		671,340
	Trust preferred securities – banks and insurance	—			—				150,418			446,038				150,418			446,038						Municipal securities	258		36,551		687		4,616		945		41,167
		7,749			806,633				159,669			1,013,150				167,418			1,819,783						Asset-backed securities:
																									Trust preferred securities – banks and insurance	—		—		121,984		405,605		121,984		405,605
	Mutual funds and other	646			72,296				—			—				646			72,296
																									Other	7		1,607		—		—		7		1,607
		8,395			878,929				159,669			1,013,150				168,064			1,892,079
																										12,558		1,254,783		129,717		699,056		142,275		1,953,839
	Total	$	9,117		$	972,132			$	159,750		$	1,016,981			$	168,867		$	1,989,113
																									Mutual funds and other	1,044		71,907		—		—		1,044		71,907
																										13,602		1,326,690		129,717		699,056		143,319		2,025,746
																									Total	$	14,182	$	1,389,574	$	170,303	$	770,245	$	184,485	$	2,159,819
Rollforward Of Total Amount Of Credit-Related OTTI
	(In thousands)	Three Months Ended										Three Months Ended
		31-Mar-15										31-Mar-14
		HTM			AFS				Total			HTM				AFS			Total
	Balance of credit-related OTTI at beginning	$	(9,079	)	$	(95,472	)		$	(104,551	)	$	(9,052	)		$	(176,833	)	$	(185,885	)
	of period
	Additional credit-related OTTI on securities previously impaired	—			—				—			(27		)		—			(27		)
	Reductions for securities sold or paid off during the period	—			1,313				1,313			—				12,919			12,919
	Reclassification of securities from HTM to AFS	9,079			(9,079		)		—			—				—			—
	Balance of credit-related OTTI at end of period	$	—		$	(103,238	)		$	(103,238	)	$	(9,079	)		$	(163,914	)	$	(172,993	)
Gains And Losses, Including OTTI, Recognized In Statement Of Income
			Three Months Ended
			March 31, 2015							March 31, 2014
		(In thousands)	Gross gains			Gross losses				Gross gains			Gross losses
		Investment securities:
		Held-to-maturity	$	1		$	—			$	—		$	27
		Available-for-sale	958			1,198				72,561			41,647
		Other noninterest-bearing investments	3,595			242				912			—
			4,554			1,440				73,473			41,674
		Net gains				$	3,114						$	31,799
		Statement of income information:
		Net impairment losses on investment securities				$	—						$	(27	)
		Equity securities gains, net				3,353							912
		Fixed income securities gains (losses), net				(239		)					30,914
		Net gains				$	3,114						$	31,799
Tax and Nontaxable Interest Income by Investment Type [Table Text Block]
	(In thousands)	Three Months Ended										Three Months Ended
		31-Mar-15										31-Mar-14
		Taxable			Nontaxable				Total			Taxable				Nontaxable			Total
	Investment securities:
	Held-to-maturity	$	3,592		$	2,862			$	6,454		$	3,828			$	2,836		$	6,664
	Available-for-sale	19,768			653				20,421			20,424				524			20,948
	Trading	598			—				598			482				—			482
		$	23,958		$	3,515			$	27,473		$	24,734			$	3,360		$	28,094

Loans_And_Allowance_For_Credit1

Loans And Allowance For Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2015																			Mar. 31, 2014
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring and Financing Receivables, 12 months or less [Table Text Block]
		Three Months Ended									Three Months Ended
		31-Mar-15									31-Mar-14
	(In thousands)	Accruing			Nonaccruing			Total			Accruing			Nonaccruing		Total
	Commercial:
	Commercial and industrial	$	—		$	44		$	44		$	—		$	—	$	—
	Owner occupied	—			986			986			—			—		—
	Total commercial	—			1,030			1,030			—			—		—
	Commercial real estate:
	Construction and land development	—			1,284			1,284			—			—		—
	Term	—			—			—			—			84		84
	Total commercial real estate	—			1,284			1,284			—			84		84
	Consumer:
	Home equity credit line	—			—			—			—			217		217
	1-4 family residential	110			—			110			—			—		—
	Construction and other consumer real estate	—			—			—			—			26		26
	Total consumer loans	110			—			110			—			243		243
	Total	$	110		$	2,314		$	2,424		$	—		$	327	$	327
	Note: Total loans modified as TDRs during the 12 months previous to March 31, 2015 and 2014 were $74.5 million and
Schedule of Quantitative Information about Derecognized Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Table Text Block]
	(In billions)	March 31,			December 31,
		2015			2014
	Loan Servicing Assets	$	1.2		$	1.2
Summary Of Major Portfolio Segment And Specific Loan Class
	(In thousands)	March 31,			December 31,
		2015			2014
	Loans held for sale	$	128,946		$	132,504
	Commercial:
	Commercial and industrial	$	13,264,092		$	13,162,955
	Leasing	407,137			408,974
	Owner occupied	7,309,639			7,351,548
	Municipal	555,122			520,887
	Total commercial	21,535,990			21,444,364
	Commercial real estate:
	Construction and land development	2,044,641			1,986,408
	Term	8,088,430			8,126,600
	Total commercial real estate	10,133,071			10,113,008
	Consumer:
	Home equity credit line	2,314,806			2,321,150
	1-4 family residential	5,212,963			5,200,882
	Construction and other consumer real estate	373,335			370,542
	Bankcard and other revolving plans	406,723			401,352
	Other	203,226			212,360
	Total consumer	8,511,053			8,506,286
	Total loans	$	40,180,114		$	40,063,658
Summary Of Changes in The Allowance For Credit Losses	Changes in the allowance for credit losses are summarized as follows:
		Three Months Ended March 31, 2015
	(In thousands)	Commercial			Commercial			Consumer			Total
					real estate
	Allowance for loan losses:
	Balance at beginning of period	$	412,514		$	145,009		$	47,140		$	604,663
	Additions:
	Provision for loan losses	24,934			(26,887		)	459			(1,494		)
	Adjustment for FDIC-supported/PCI loans	(38		)							(38		)
	Deductions:
	Gross loan and lease charge-offs	(15,951		)	(626		)	(3,611		)	(20,188		)
	Recoveries	20,613			14,119			2,338			37,070
	Net loan and lease charge-offs	4,662			13,493			(1,273		)	16,882
	Balance at end of period	$	442,072		$	131,615		$	46,326		$	620,013
	Reserve for unfunded lending commitments:
	Balance at beginning of period	$	58,931		$	21,517		$	628		$	81,076
	Provision charged (credited) to earnings	3,844			(2,580		)	(53		)	1,211
	Balance at end of period	$	62,775		$	18,937		$	575		$	82,287
	Total allowance for credit losses at end of period:
	Allowance for loan losses	$	442,072		$	131,615		$	46,326		$	620,013
	Reserve for unfunded lending commitments	62,775			18,937			575			82,287
	Total allowance for credit losses	$	504,847		$	150,552		$	46,901		$	702,300
		Three Months Ended March 31, 2014
	(In thousands)	Commercial			Commercial			Consumer			Total
					real estate
	Allowance for loan losses:
	Balance at beginning of period	$	469,213		$	216,012		$	61,066		$	746,291
	Additions:
	Provision for loan losses	11,260			(2,891		)	(8,979		)	(610		)
	Adjustment for FDIC-supported/PCI loans	(781		)	—			(36		)	(817		)
	Deductions:
	Gross loan and lease charge-offs	(9,796		)	(7,854		)	(3,145		)	(20,795		)
	Recoveries	7,805			2,882			2,197			12,884
	Net loan and lease charge-offs	(1,991		)	(4,972		)	(948		)	(7,911		)
	Balance at end of period	$	477,701		$	208,149		$	51,103		$	736,953
	Reserve for unfunded lending commitments:
	Balance at beginning of period	$	48,345		$	37,485		$	3,875		$	89,705
	Provision charged (credited) to earnings	1,525			(2,212		)	(325		)	(1,012		)
	Balance at end of period	$	49,870		$	35,273		$	3,550		$	88,693
	Total allowance for credit losses at end of period:
	Allowance for loan losses	$	477,701		$	208,149		$	51,103		$	736,953
	Reserve for unfunded lending commitments	49,870			35,273			3,550			88,693
	Total allowance for credit losses	$	527,571		$	243,422		$	54,653		$	825,646
	The ALLL and outstanding loan balances according to the Company’s impairment method are summarized as follows:
		March 31, 2015
	(In thousands)	Commercial			Commercial			Consumer			Total
					real estate
	Allowance for loan losses:
	Individually evaluated for impairment	$	38,382		$	5,326		$	9,437		$	53,145
	Collectively evaluated for impairment	402,597			126,231			36,602			565,430
	Purchased loans with evidence of credit deterioration	1,093			58			287			1,438
	Total	$	442,072		$	131,615		$	46,326		$	620,013
	Outstanding loan balances:
	Individually evaluated for impairment	$	305,678		$	141,470		$	88,073		$	535,221
	Collectively evaluated for impairment	21,156,592			9,917,574			8,407,837			39,482,003
	Purchased loans with evidence of credit deterioration	73,720			74,027			15,143			162,890
	Total	$	21,535,990		$	10,133,071		$	8,511,053		$	40,180,114
Summary Of Nonaccrual Loans	Nonaccrual loans are summarized as follows:
	(In thousands)	March 31,			December 31,
		2015			2014
	Commercial:
	Commercial and industrial	$	163,499		$	105,591
	Leasing	247			295
	Owner occupied	97,609			87,243
	Municipal	1,027			1,056
	Total commercial	262,382			194,185
	Commercial real estate:
	Construction and land development	22,101			23,880
	Term	37,517			25,107
	Total commercial real estate	59,618			48,987
	Consumer:
	Home equity credit line	10,337			11,430
	1-4 family residential	48,078			49,861
	Construction and other consumer real estate	1,301			1,735
	Bankcard and other revolving plans	318			196
	Other	32			254
	Total consumer loans	60,066			63,476
	Total	$	382,066		$	306,648
Summary Of Past Due Loans (Accruing And Nonaccruing)	Past due loans (accruing and nonaccruing) are summarized as follows:
		March 31, 2015
	(In thousands)	Current			30-89 days			90+ days			Total			Total		Accruing		Nonaccrual
					past due			past due			past due			loans		loans		loans
																90+ days		that are
																past due		current 1
	Commercial:
	Commercial and industrial	$	13,182,403		$	42,881		$	38,808		$	81,689		$	13,264,092	$	2,969	$	109,978
	Leasing	406,902			208			27			235			407,137		—		197
	Owner occupied	7,222,254			44,380			43,005			87,385			7,309,639		2,247		40,515
	Municipal	553,002			2,120			—			2,120			555,122		—		1,027
	Total commercial	21,364,561			89,589			81,840			171,429			21,535,990		5,216		151,717
	Commercial real estate:
	Construction and land development	2,027,240			4,114			13,287			17,401			2,044,641		2,590		11,338
	Term	8,038,106			17,208			33,116			50,324			8,088,430		21,910		23,398
	Total commercial real estate	10,065,346			21,322			46,403			67,725			10,133,071		24,500		34,736
	Consumer:
	Home equity credit line	2,302,583			4,522			7,701			12,223			2,314,806		—		1,103
	1-4 family residential	5,181,356			12,780			18,827			31,607			5,212,963		268		22,781
	Construction and other consumer real estate	361,483			10,682			1,170			11,852			373,335		556		664
	Bankcard and other revolving plans	402,775			2,859			1,089			3,948			406,723		951		98
	Other	202,276			889			61			950			203,226		61		27
	Total consumer loans	8,450,473			31,732			28,848			60,580			8,511,053		1,836		24,673
	Total	$	39,880,380		$	142,643		$	157,091		$	299,734		$	40,180,114	$	31,552	$	211,126
		December 31, 2014
	(In thousands)	Current			30-89 days			90+ days			Total			Total		Accruing		Nonaccrual
					past due			past due			past due			loans		loans		loans
																90+ days		that are
																past due		current 1
	Commercial:
	Commercial and industrial	$	13,092,731		$	28,295		$	41,929		$	70,224		$	13,162,955	$	4,677	$	64,385
	Leasing	408,724			225			25			250			408,974		—		270
	Owner occupied	7,275,842			29,182			46,524			75,706			7,351,548		3,334		39,649
	Municipal	520,887			—			—			—			520,887		—		1,056
	Total commercial	21,298,184			57,702			88,478			146,180			21,444,364		8,011		105,360
	Commercial real estate:
	Construction and land development	1,972,206			2,711			11,491			14,202			1,986,408		92		12,481
	Term	8,082,940			14,415			29,245			43,660			8,126,600		19,700		13,787
	Total commercial real estate	10,055,146			17,126			40,736			57,862			10,113,008		19,792		26,268
	Consumer:
	Home equity credit line	2,309,967			4,503			6,680			11,183			2,321,150		1		1,779
	1-4 family residential	5,163,610			12,416			24,856			37,272			5,200,882		318		20,599
	Construction and other consumer real estate	359,723			9,675			1,144			10,819			370,542		160		608
	Bankcard and other revolving plans	397,882			2,425			1,045			3,470			401,352		946		80
	Other	211,560			644			156			800			212,360		—		84
	Total consumer loans	8,442,742			29,663			33,881			63,544			8,506,286		1,425		23,150
	Total	$	39,796,072		$	104,491		$	163,095		$	267,586		$	40,063,658	$	29,228	$	154,778
	1	Represents nonaccrual loans that are 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
		March 31, 2015
	(In thousands)	Pass			Special			Sub-			Doubtful			Total		Total
					Mention			standard						loans		allowance
	Commercial:
	Commercial and industrial	$	12,342,163		$	325,604		$	587,272		$	9,053		$	13,264,092
	Leasing	388,843			11,656			6,638			—			407,137
	Owner occupied	6,851,794			111,853			345,992			—			7,309,639
	Municipal	552,874			1,221			1,027			—			555,122
	Total commercial	20,135,674			450,334			940,929			9,053			21,535,990		$	442,072
	Commercial real estate:
	Construction and land development	1,994,072			8,515			42,054			—			2,044,641
	Term	7,827,313			68,890			187,799			4,428			8,088,430
	Total commercial real estate	9,821,385			77,405			229,853			4,428			10,133,071		131,615
	Consumer:
	Home equity credit line	2,298,505			—			16,301			—			2,314,806
	1-4 family residential	5,149,513			—			63,450			—			5,212,963
	Construction and other consumer real estate	370,817			—			2,518			—			373,335
	Bankcard and other revolving plans	404,826			—			1,897			—			406,723
	Other	202,909			—			317			—			203,226
	Total consumer loans	8,426,570			—			84,483			—			8,511,053		46,326
	Total	$	38,383,629		$	527,739		$	1,255,265		$	13,481		$	40,180,114	$	620,013
		December 31, 2014
	(In thousands)	Pass			Special			Sub-			Doubtful			Total		Total
					Mention			standard						loans		allowance
	Commercial:
	Commercial and industrial	$	12,515,846		$	209,215		$	426,002		$	11,892		$	13,162,955
	Leasing	399,032			4,868			5,074			—			408,974
	Owner occupied	6,844,310			168,423			338,815			—			7,351,548
	Municipal	518,513			1,318			1,056			—			520,887
	Total commercial	20,277,701			383,824			770,947			11,892			21,444,364		$	412,514
	Commercial real estate:
	Construction and land development	1,925,685			8,464			52,259			—			1,986,408
	Term	7,802,571			96,347			223,324			4,358			8,126,600
	Total commercial real estate	9,728,256			104,811			275,583			4,358			10,113,008		145,009
	Consumer:
	Home equity credit line	2,304,352			—			16,798			—			2,321,150
	1-4 family residential	5,138,660			—			62,222			—			5,200,882
	Construction and other consumer real estate	367,932			—			2,610			—			370,542
	Bankcard and other revolving plans	399,446			—			1,906			—			401,352
	Other	211,811			—			549			—			212,360
	Total consumer loans	8,422,201			—			84,085			—			8,506,286		47,140
	Total	$	38,428,158		$	488,635		$	1,130,615		$	16,250		$	40,063,658	$	604,663
Summary Of Information On Impaired Loans	The ALLL and outstanding loan balances according to the Company’s impairment method are summarized as follows:
		March 31, 2015																			March 31, 2015
	(In thousands)	Commercial			Commercial			Consumer			Total									(In thousands)	Unpaid		Recorded investment				Total		Related
					real estate																principal						recorded		allowance
	Allowance for loan losses:																				balance		with no		with		investment
	Individually evaluated for impairment	$	38,382		$	5,326		$	9,437		$	53,145											allowance		allowance
																				Commercial:
	Collectively evaluated for impairment	402,597			126,231			36,602			565,430									Commercial and industrial	$	223,938	$	34,260	$	147,353	$	181,613	$	30,899
	Purchased loans with evidence of credit deterioration	1,093			58			287			1,438									Owner occupied	202,999		102,672		73,403		176,075		7,341
	Total	$	442,072		$	131,615		$	46,326		$	620,013								Municipal	1,505		1,027		—		1,027		—
																				Total commercial	428,442		137,959		220,756		358,715		38,240
	Outstanding loan balances:
	Individually evaluated for impairment	$	305,678		$	141,470		$	88,073		$	535,221								Commercial real estate:
																				Construction and land development	55,316		12,565		25,897		38,462		1,293
	Collectively evaluated for impairment	21,156,592			9,917,574			8,407,837			39,482,003
																				Term	180,822		116,700		30,231		146,931		3,550
	Purchased loans with evidence of credit deterioration	73,720			74,027			15,143			162,890
																				Total commercial real estate	236,138		129,265		56,128		185,393		4,843
	Total	$	21,535,990		$	10,133,071		$	8,511,053		$	40,180,114
																				Consumer:
																				Home equity credit line	29,149		14,491		11,288		25,779		189
																				1-4 family residential	80,023		30,356		36,681		67,037		8,885
		December 31, 2014
	(In thousands)	Commercial			Commercial			Consumer			Total									Construction and other consumer real estate	3,498		1,310		1,246		2,556		187
					real estate
	Allowance for loan losses:																			Bankcard and other revolving plans	—		—		—		—		—
	Individually evaluated for impairment	$	28,627		$	4,027		$	9,059		$	41,713
																				Other	5,825		—		4,674		4,674		95
	Collectively evaluated for impairment	382,552			140,090			37,508			560,150
																				Total consumer loans	118,495		46,157		53,889		100,046		9,356
	Purchased loans with evidence of credit deterioration	1,335			892			573			2,800
																				Total	$	783,075	$	313,381	$	330,773	$	644,154	$	52,439
	Total	$	412,514		$	145,009		$	47,140		$	604,663
	Outstanding loan balances:
	Individually evaluated for impairment	$	259,207		$	167,435		$	95,267		$	521,909									December 31, 2014
																				(In thousands)	Unpaid		Recorded investment				Total		Related
	Collectively evaluated for impairment	21,105,217			9,861,862			8,395,371			39,362,450										principal						recorded		allowance
																					balance		with no		with		investment
	Purchased loans with evidence of credit deterioration	79,940			83,711			15,648			179,299												allowance		allowance
																				Commercial:
	Total	$	21,444,364		$	10,113,008		$	8,506,286		$	40,063,658								Commercial and industrial	$	185,520	$	43,257	$	103,565	$	146,822	$	22,852
																				Owner occupied	198,231		83,179		86,382		169,561		6,087
																				Municipal	1,535		1,056		—		1,056		—
																				Total commercial	385,286		127,492		189,947		317,439		28,939
																				Commercial real estate:
																				Construction and land development	60,993		16,500		26,977		43,477		1,773
																				Term	203,788		96,351		63,740		160,091		2,345
																				Total commercial real estate	264,781		112,851		90,717		203,568		4,118
																				Consumer:
																				Home equity credit line	30,209		14,798		11,883		26,681		437
																				1-4 family residential	86,575		37,096		35,831		72,927		8,494
																				Construction and other consumer real estate	3,902		1,449		1,410		2,859		233
																				Bankcard and other revolving plans	—		—		—		—		—
																				Other	6,580		—		5,254		5,254		133
																				Total consumer loans	127,266		53,343		54,378		107,721		9,297
																				Total	$	777,333	$	293,686	$	335,042	$	628,728	$	42,354
																					Three Months Ended				Three Months Ended
																					31-Mar-15				31-Mar-14
																				(In thousands)	Average		Interest		Average		Interest
																					recorded		income		recorded		income
																					investment		recognized		investment		recognized
																				Commercial:
																				Commercial and industrial	$	160,013	$	1,451	$	188,191	$	2,591
																				Owner occupied	177,568		4,092		237,902		4,758
																			Municipal	1,033		—		—		—
																			Total commercial	338,614		5,543		426,093		7,349
																			Commercial real estate:
																			Construction and land development	38,736		569		66,772		3,538
																			Term	143,496		5,008		293,802		14,183
																			Total commercial real estate	182,232		5,577		360,574		17,721
																			Consumer:
																			Home equity credit line	25,386		413		25,224		402
																			1-4 family residential	66,711		510		83,241		540
																			Construction and other consumer real estate	2,560		42		3,490		38
																			Bankcard and other revolving plans	2		100		10		1
																			Other	4,748		285		8,595		494
																			Total consumer loans	99,407		1,350		120,560		1,475
																			Total	$	620,253	$	12,470	$	907,227	$	26,545
Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type
		March 31, 2015
		Recorded investment resulting from the following modification types:
	(In thousands)	Interest			Maturity			Principal			Payment			Other1		Multiple		Total
		rate below			or term			forgiveness			deferral					modification
		market			extension											types2
	Accruing
	Commercial:
	Commercial and industrial	$	2,509		$	3,462		$	17		$	464		$	151	$	21,929	$	28,532
	Owner occupied	19,744			1,092			952			1,241			10,845		17,167		51,041
	Total commercial	22,253			4,554			969			1,705			10,996		39,096		79,573
	Commercial real estate:
	Construction and land development	—			—			—			—			510		13,712		14,222
	Term	7,238			1,019			176			973			2,289		32,729		44,424
	Total commercial real estate	7,238			1,019			176			973			2,799		46,441		58,646
	Consumer:
	Home equity credit line	741			84			10,968			—			164		1,623		13,580
	1-4 family residential	2,402			366			7,073			442			1,381		33,676		45,340
	Construction and other consumer real estate	284			416			—			—			—		1,226		1,926
	Total consumer loans	3,427			866			18,041			442			1,545		36,525		60,846
	Total accruing	32,918			6,439			19,186			3,120			15,340		122,062		199,065
	Nonaccruing
	Commercial:
	Commercial and industrial	322			515			—			3,310			6,951		25,035		36,133
	Owner occupied	2,328			1,163			—			833			2,525		11,027		17,876
	Municipal	—			1,027			—			—			—		—		1,027
	Total commercial	2,650			2,705			—			4,143			9,476		36,062		55,036
	Commercial real estate:
	Construction and land development	10,901			66			—			93			3,249		7,667		21,976
	Term	2,780			—			865			2,170			—		9,901		15,716
	Total commercial real estate	13,681			66			865			2,263			3,249		17,568		37,692
	Consumer:
	Home equity credit line	—			—			713			203			—		150		1,066
	1-4 family residential	207			227			2,245			185			3,601		9,699		16,164
	Construction and other consumer real estate	—			243			—			76			—		87		406
	Total consumer loans	207			470			2,958			464			3,601		9,936		17,636
	Total nonaccruing	16,538			3,241			3,823			6,870			16,326		63,566		110,364
	Total	$	49,456		$	9,680		$	23,009		$	9,990		$	31,666	$	185,628	$	309,429
		December 31, 2014
		Recorded investment resulting from the following modification types:
	(In thousands)	Interest			Maturity			Principal			Payment			Other1		Multiple		Total
		rate below			or term			forgiveness			deferral					modification
		market			extension											types2
	Accruing
	Commercial:
	Commercial and industrial	$	2,611		$	6,509		$	18		$	3,203		$	3,855	$	34,585	$	50,781
	Owner occupied	19,981			1,124			960			1,251			10,960		17,505		51,781
	Total commercial	22,592			7,633			978			4,454			14,815		52,090		102,562
	Commercial real estate:
	Construction and land development	—			—			—			—			521		19,854		20,375
	Term	7,328			9,027			179			3,153			2,546		39,007		61,240
	Total commercial real estate	7,328			9,027			179			3,153			3,067		58,861		81,615
	Consumer:
	Home equity credit line	742			70			11,320			—			166		1,281		13,579
	1-4 family residential	2,425			552			6,828			446			753		34,719		45,723
	Construction and other consumer real estate	290			422			42			90			—		1,227		2,071
	Total consumer loans	3,457			1,044			18,190			536			919		37,227		61,373
	Total accruing	33,377			17,704			19,347			8,143			18,801		148,178		245,550
	Nonaccruing
	Commercial:
	Commercial and industrial	442			576			—			611			5,199		20,410		27,238
	Owner occupied	2,714			1,219			—			883			2,852		12,040		19,708
	Municipal	—			1,056			—			—			—		—		1,056
	Total commercial	3,156			2,851			—			1,494			8,051		32,450		48,002
Commercial real estate:
Construction and land development	11,080			68			—			93			3,300		6,427		20,968
Term	2,851			—			—			—			277		4,607		7,735
Total commercial real estate	13,931			68			—			93			3,577		11,034		28,703
Consumer:
Home equity credit line	—			—			420			203			—		399		1,022
1-4 family residential	3,378			1,029			1,951			191			3,527		9,413		19,489
Construction and other consumer real estate	—			463			—			—			—		100		563
Total consumer loans	3,378			1,492			2,371			394			3,527		9,912		21,074
Total nonaccruing	20,465			4,411			2,371			1,981			15,155		53,396		97,779
Total	$	53,842		$	22,115		$	21,718		$	10,124		$	33,956	$	201,574	$	343,329
1	Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.
2	Includes TDRs that resulted from a combination of any of the previous modification types.
Schedule Of Net Financial Impact On Interest Income Due To Interest Rate Modifications Below Market For Accruing TDR Loans
		Three Months Ended
		March 31,
	(In thousands)	2015			2014
	Commercial:
	Commercial and industrial	$	(57	)	$	18
	Owner occupied	(112		)	(142		)
	Total commercial	(169		)	(124		)
	Commercial real estate:
	Construction and land development	(37		)	(56		)
	Term	(109		)	(148		)
	Total commercial real estate	(146		)	(204		)
	Consumer:
	Home equity credit line	(1		)	(2		)
	1-4 family residential	(271		)	(300		)
	Construction and other consumer real estate	(7		)	(9		)
	Total consumer loans	(279		)	(311		)
	Total decrease to interest income1	$	(594	)	$	(639	)
	1Calculated based on the difference between the modified rate and the premodified rate applied to the recorded investment.
Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans
	(In thousands)	March 31,			December 31,
		2015			2014
	Commercial	$	96,157		$	104,942
	Commercial real estate	105,234			118,217
	Consumer	17,129			17,910
	Outstanding balance	$	218,520		$	241,069
	Carrying amount	$	162,890		$	179,299
	Less ALLL	1,438			2,800
	Carrying amount, net	$	161,452		$	176,499
Schedule Of Changes In The Accretable Yield For PCI Loans
	(In thousands)	Three Months Ended
		March 31,
		2015			2014
	Balance at beginning of period	$	45,055		$	77,528
	Accretion	(9,583		)	(22,307		)
	Reclassification from nonaccretable difference	13,281			8,920
	Disposals and other	2,178			1,624
	Balance at end of period	$	50,931		$	65,765

Derivative_Instruments_And_Hed1

Derivative Instruments And Hedging Activities Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2015
Summary of Derivative Instruments [Abstract]
Schedule of Derivative Instruments
		March 31, 2015						December 31, 2014
		Notional		Fair value				Notional		Fair value
	(In thousands)	amount		Other		Other		amount		Other		Other
				assets		liabilities				assets		liabilities
	Derivatives designated as hedging instruments
	Cash flow hedges:
	Interest rate swaps	$	300,000	$	4,623	$	—	$	275,000	$	1,508	$	123
	Total derivatives designated as hedging instruments	300,000		4,623		—		275,000		1,508		123
	Derivatives not designated as hedging instruments
	Interest rate swaps for customers 2	3,048,760		58,982		62,452		2,770,052		48,287		50,669
	Foreign exchange	355,708		20,373		18,671		443,721		16,625		15,272
	Total derivatives not designated as hedging instruments	3,404,468		79,355		81,123		3,213,773		64,912		65,941
	Total derivatives	$	3,704,468	$	83,978	$	81,123	$	3,488,773	$	66,420	$	66,064
Schedule Of Gain (Loss) Of Derivative Instruments
		Three Months Ended March 31, 2015								Three Months Ended March 31, 2014
		Amount of derivative gain (loss) recognized/reclassified
	(In thousands)	OCI		Reclassified		Noninterest		Offset to		OCI		Reclassified		Noninterest			Offset to
				from AOCI		income		interest				from AOCI		income			interest
				to interest		(expense)		expense				to interest		(expense)			expense
				income 3								income 3
	Derivatives designated as hedging instruments
	Asset derivatives
	Cash flow hedges 1:
	Interest rate swaps	$	4,253	$	1,016	$	—			$	538	$	351	$	—
		4,253		1,016		—				538		351		—
	Liability derivatives
	Fair value hedges:
	Terminated swaps on long-term debt							$	468								$	718
	Total derivatives designated as hedging instruments	4,253		1,016		—		468		538		351		—			718
	Derivatives not designated as hedging instruments
	Interest rate swaps					—								6
	Interest rate swaps for customers 2					517								(549		)
	Futures contracts					1								—
	Foreign exchange					2,735								1,711
	Total return swap					—								(7,427		)
	Total derivatives not designated as hedging instruments					3,253								(6,259		)
	Total derivatives	$	4,253	$	1,016	$	3,253	$	468	$	538	$	351	$	(6,259	)	$	718
	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.
	2	Amounts include both the customer swaps and the offsetting derivative contracts.
	3	Amounts for the three months ended March 31, 2015 and 2014 of $1.0 million and $0.4 million, respectively, are the amounts of reclassification to earnings from AOCI presented in Note 8.

Debt_And_Shareholders_Equity_T

Debt And Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Minimum and Maximum Interest Rate on debt repayment [Table Text Block]
	Interest rate	Minimum interest rate		Maximum interest rate
	Minimum and maximum Interest rates on long-term senior debt redemptions during 1st and 2nd quarters
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt is summarized as follows:
	(In thousands)		March 31, 2015				December 31, 2014
	Junior subordinated debentures related to trust preferred securities		$	168,043			$	168,043
	Convertible subordinated notes		138,002				132,838
	Subordinated notes		335,341				335,798
	Senior notes		424,901				432,385
	FHLB advances		22,009				22,156
	Capital lease obligations and other		1,025				1,062
	Total		$	1,089,321			$	1,092,282
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
			Amounts reclassified								Statement of income (SI) Balance sheet
			from AOCI 1								(BS)
	(In thousands)		Three Months Ended
			March 31,
	Details about AOCI components		2015				2014						Affected line item
	Net realized gains (losses) on investment securities		$	(239	)		$	30,914			SI		Fixed income securities gains (losses), net
	Income tax expense (benefit)		(91		)		6,074
			(148		)		24,840
	Net unrealized losses on investment		—				(27		)		SI		Net impairment losses on investment securities
	securities
	Income tax benefit		—				(10		)
			—				(17		)
	Accretion of securities with noncredit-related impairment losses not expected to be sold		—				(482		)		BS		Investment securities, held-to-maturity
	Deferred income taxes		—				196				BS		Other assets
			$	(148	)		$	24,537
	Net unrealized gains on derivative instruments		$	1,016			$	351			SI		Interest and fees on loans
	Income tax expense		387				141
			$	629			$	210
	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.
Schedule Of Changes In Accumulated Other Comprehensive Income (Loss)
	(In thousands)		Net unrealized gains (losses) on investment securities						Net unrealized gains (losses) on derivatives and other					Pension and post-retirement			Total
	Three Months Ended March 31, 2015
	Balance at December 31, 2014			$	(91,921	)				$	2,226			$	(38,346	)	$	(128,041	)
	Other comprehensive income before reclassifications, net of tax			11,424						2,189				—			13,613
	Amounts reclassified from AOCI, net of tax			148						(629		)		—			(481		)
	Other comprehensive income			11,572						1,560				—			13,132
	Balance at March 31, 2015			$	(80,349	)				$	3,786			$	(38,346	)	$	(114,909	)
	Income tax expense included in other comprehensive income			$	6,957					$	1,088			$	—		$	8,045
	Three Months Ended March 31, 2014
	Balance at December 31, 2013			$	(168,805	)				$	1,556			$	(24,852	)	$	(192,101	)
	Other comprehensive income (loss) before reclassifications, net of tax			73,907						(2,521		)		—			71,386
	Amounts reclassified from AOCI, net of tax			(24,537		)				(210		)		—			(24,747		)
	Other comprehensive income (loss)			49,370						(2,731		)		—			46,639
	Balance at March 31, 2014			$	(119,435	)				$	(1,175	)		$	(24,852	)	$	(145,462	)
	Income tax expense (benefit) included in other comprehensive income (loss)			$	40,396					$	(1,683	)		$	—		$	38,713

Debt_And_Shareholders_Equity_S

Debt And Shareholders' Equity Schedule of Subordinated Notes (Tables)	3 Months Ended
	Mar. 31, 2015
Long-term Debt, Unclassified [Abstract]
Schedule of Subordinated Borrowing [Table Text Block]
		Coupon	Carrying value
	(Amounts in thousands)	rate	March 31, 2015		Maturity
	Convertible subordinated note	6.00%	$	73,397	September 15, 2015
	Subordinated note	6.00%	32,706		September 15, 2015
	Convertible subordinated note	5.50%	64,606		November 16, 2015
	Subordinated note	5.50%	52,744		November 16, 2015
			$	223,453

Debt_And_Shareholders_Equity_S1

Debt And Shareholders' Equity Schedule of Long-term Debt Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Instrument [Line Items]
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt is summarized as follows:
	(In thousands)	March 31, 2015		December 31, 2014
	Junior subordinated debentures related to trust preferred securities	$	168,043	$	168,043
	Convertible subordinated notes	138,002		132,838
	Subordinated notes	335,341		335,798
	Senior notes	424,901		432,385
	FHLB advances	22,009		22,156
	Capital lease obligations and other	1,025		1,062
	Total	$	1,089,321	$	1,092,282

Fair_Value_Tables

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis
	(In thousands)	March 31, 2015
		Level 1				Level 2			Level 3				Total
	ASSETS
	Investment securities:
	Available-for-sale:
	U.S. Treasury, agencies and corporations	$	—			$	3,655,221		$	—			$	3,655,221
	Municipal securities					173,145			2,465				175,610
	Asset-backed securities:
	Trust preferred – banks and insurance					23,179			438,338				461,517
	Other					638			4,826				5,464
	Mutual funds and other	124,443				28,247							152,690
		124,443				3,880,430			445,629				4,450,502
	Trading account					71,392							71,392
	Other noninterest-bearing investments:
	Bank-owned life insurance					478,926							478,926
	Private equity								107,448				107,448
	Other assets:
	Agriculture loan servicing and interest-only strips								12,001				12,001
	Deferred compensation plan assets	91,368											91,368
	Derivatives:
	Interest rate related and other					5,408							5,408
	Interest rate swaps for customers					58,982							58,982
	Foreign currency exchange contracts	20,373											20,373
		20,373				64,390			—				84,763
		$	236,184			$	4,495,138		$	565,078			$	5,296,400
	LIABILITIES
	Securities sold, not yet purchased	$	6,749			$	—		$	—			$	6,749
	Other liabilities:
	Deferred compensation plan obligations	91,368											91,368
	Derivatives:
	Interest rate related and other					176							176
	Interest rate swaps for customers					62,452							62,452
	Foreign currency exchange contracts	18,671											18,671
		18,671				62,628			—				81,299
		$	116,788			$	62,628		$	—			$	179,416
	(In thousands)	December 31, 2014
		Level 1				Level 2			Level 3				Total
	ASSETS
	Investment securities:
	Available-for-sale:
	U.S. Treasury, agencies and corporations	$	—			$	3,098,208		$	—			$	3,098,208
	Municipal securities					185,093			4,164				189,257
	Asset-backed securities:
	Trust preferred – banks and insurance					22,701			393,007				415,708
	Auction rate								4,761				4,761
	Other					666			25				691
	Mutual funds and other	105,348				30,275							135,623
		105,348				3,336,943			401,957				3,844,248
	Trading account					70,601							70,601
	Other noninterest-bearing investments:
	Bank-owned life insurance					476,290							476,290
	Private equity								99,865				99,865
	Other assets:
	Agriculture loan servicing and interest-only strips								12,227				12,227
	Deferred compensation plan assets	88,878											88,878
	Derivatives:
	Interest rate related and other					1,508							1,508
	Interest rate swaps for customers					48,287							48,287
	Foreign currency exchange contracts	16,625											16,625
		16,625				49,795			—				66,420
		$	210,851			$	3,933,629		$	514,049			$	4,658,529
	LIABILITIES
	Securities sold, not yet purchased	$	24,230			$	—		$	—			$	24,230
Other liabilities:
Deferred compensation plan obligations	88,878											88,878
Derivatives:
Interest rate related and other					297							297
Interest rate swaps for customers					50,669							50,669
Foreign currency exchange contracts	15,272											15,272
	15,272				50,966			—				66,238
Other								13				13
	$	128,380			$	50,966		$	13			$	179,359
Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs
		Level 3 Instruments
		Three Months Ended March 31, 2015
	(In thousands)	Municipal				Trust			Trust				Other				Private				Ag loan svcg and int-only strips			Derivatives
		securities				preferred – banks and insurance			preferred								equity							and other
									– REIT								investments							liabilities
	Balance at December 31, 2014	$	4,164			$	393,007		$	—			$	4,786			$	99,865			$	12,227		$	(13	)
	Net gains (losses) included in:
	Statement of income:
	Accretion of purchase discount on securities available-for-sale	2				257
	Dividends and other investment income																1,074
	Equity securities losses, net																3,253
	Fixed income securities gains (losses), net	31				(323		)
	Other noninterest income																				4
	Other noninterest expense																							13
	Other comprehensive income (loss)	127				(6,949		)					42
	Fair value of HTM securities reclassified as AFS					57,308
	Purchases																5,052				171
	Sales					(2,613		)									(1,517		)
	Redemptions and paydowns	(1,859		)		(2,349		)					(2		)		(279		)		(401		)
	Balance at March 31, 2015	$	2,465			$	438,338		$	—			$	4,826			$	107,448			$	12,001		$	—
		Level 3 Instruments
		Three Months Ended March 31, 2014
	(In thousands)	Municipal				Trust			Trust				Auction				Other				Private			Ag loan svcg and int-only strips			Derivatives
		securities				preferred – banks and insurance			preferred – REIT				rate				asset-backed				equity						and other
																					investments						liabilities
	Balance at December 31, 2013	$	10,662			$	1,238,820		$	22,996			$	6,599			$	25,800			$	82,410		$	8,852		$	(4,303	)
	Net gains (losses) included in:
	Statement of income:
	Accretion of purchase discount on securities available-for-sale	10				720							1
	Dividends and other investment income																				(1,695		)
	Fair value and nonhedge derivative loss																										(7,427		)
	Fixed income securities gains, net	16				18,582			1,399								10,917
	Other noninterest income																							481
	Other noninterest expense																										8
	Other comprehensive income (loss)	(274		)		94,462							(40		)		(15		)
	Purchases																				1,356			2,077
	Sales					(546,388		)	(24,395		)						(36,669		)		(824		)
	Redemptions and paydowns	(230		)		(46,786		)									(3		)		(195		)	(203		)	6,090
	Transfers to Level 2					(69,193		)
	Balance at March 31, 2014	$	10,184			$	690,217		$	—			$	6,560			$	30			$	81,052		$	11,207		$	(5,632	)
Schedule Of Realized Gains (Losses) Using Level 3 Inputs
		(In thousands)	Three Months Ended March 31,
			2015				2014
		Dividends and other investment income	$	—			$	34
		Fixed income securities gains (losses), net	(292		)		30,914
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Table Text Block]
		Level 3 Instruments
		Quantitative information at March 31, 2015
	(Dollar amounts in thousands)	Fair value				Principal valuation techniques		Significant unobservable inputs	Range of inputs
									(% annually)
	Asset-backed securities:
	Trust preferred – predominantly banks	$	438,338			Discounted cash flow		Constant prepayment rate	until maturity – 2.0%
						Market comparables
								Constant default rate	yr 1 – 0.3% to 0.5%
									yrs 2-5 – 0.5% to 0.7%
									yrs 6 to maturity – 0.6% to 0.7%
								Loss given default	100%
								Loss given deferral	11.9% to 100%
								Discount rate	3.7% to 5.4%
								(spread over forward LIBOR)
		Level 3 Instruments
		Quantitative information at December 31, 2014
	(Dollar amounts in thousands)	Fair value				Principal valuation techniques		Significant unobservable inputs	Range of inputs
									(% annually)
	Asset-backed securities:
	Trust preferred – predominantly banks	$	393,007			Discounted cash flow		Constant prepayment rate	until maturity – 2.0%
						Market comparables
								Constant default rate	yr 1 – 0.3% to 0.8%
									yrs 2-5 – 0.5% to 0.9%
									yrs 6 to maturity – 0.6% to 0.7%
								Loss given default	100%
								Loss given deferral	14.5% to 100%
								Discount rate	3.4% to 5.6%
								(spread over forward LIBOR)
Schedule Of Assets With Fair Value Changes On Nonrecurring Basis
	(In thousands)	Fair value at March 31, 2015															Fair value at December 31, 2014
		Level 1				Level 2			Level 3				Total				Level 1				Level 2			Level 3			Total
	ASSETS
	Private equity investments, carried at cost	$	—			$	—		$	1,997			$	1,997			$	—			$	—		$	23,454		$	23,454
	Impaired loans	—				9,793			—				9,793				—				20,494			—			20,494
	Other real estate owned	—				2,886			—				2,886				—				8,034			—			8,034
		$	—			$	12,679		$	1,997			$	14,676			$	—			$	28,528		$	23,454		$	51,982
	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.
		Gains (losses) from fair value changes
	(In thousands)	Three Months Ended
		March 31,
		2015				2014
	ASSETS
	HTM securities adjusted for OTTI	$	—			$	(27	)
	Private equity investments, carried at cost	(1,153		)		—
	Impaired loans	(4,487		)		(2,177		)
	Other real estate owned	(1,008		)		(2,234		)
		$	(6,648	)		$	(4,438	)
Fair Value, by Balance Sheet Grouping [Table Text Block]
			March 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		$	1,519,352			$	—		$	1,519,352			$	—			$	—			$	1,519,352
	Derivatives (included in other assets)		83,978				—			83,978				(5,121		)		—				78,857
			$	1,603,330			$	—		$	1,603,330			$	(5,121	)		$	—			$	1,598,209
	Liabilities:
	Federal funds and other short-term borrowings		$	203,597			$	—		$	203,597			$	—			$	—			$	203,597
	Derivatives (included in other liabilities)		81,123				—			81,123				(5,121		)		(38,833		)		37,169
			$	284,720			$	—		$	284,720			$	(5,121	)		$	(38,833	)		$	240,766
			December 31, 2014
	(In thousands)													Gross amounts not offset in the balance sheet
	Description		Gross amounts recognized				Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet				Financial instruments				Cash collateral received/pledged				Net amount
	Assets:
	Federal funds sold and security resell agreements		$	1,386,291			$	—		$	1,386,291			$	—			$	—			$	1,386,291
	Derivatives (included in other assets)		66,420				—			66,420				(3,755		)						62,665
			$	1,452,711			$	—		$	1,452,711			$	(3,755	)		$	—			$	1,448,956
	Liabilities:
	Federal funds and other short-term borrowings		$	244,223			$	—		$	244,223			$	—			$	—			$	244,223
	Derivatives (included in other liabilities)		66,064				—			66,064				(3,755		)		(31,968		)		30,341
			$	310,287			$	—		$	310,287			$	(3,755	)		$	(31,968	)		$	274,564
		March 31, 2015									December 31, 2014
	(In thousands)	Carrying				Estimated			Level		Carrying				Estimated				Level
		value				fair value					value				fair value
	Financial assets:
	HTM investment securities	$	590,950			$	602,355		3		$	647,252			$	677,196			3
	Loans and leases (including loans held for sale), net of allowance	39,689,047				39,573,365			3		39,591,499				39,426,498				3
	Financial liabilities:
	Time deposits	2,344,818				2,349,454			2		2,406,924				2,408,550				2
	Foreign deposits	382,985				382,873			2		328,391				328,447				2
	Long-term debt (less fair value hedges)	1,088,285				1,149,869			2		1,090,778				1,159,287				2

Commitments_Guarantees_And_Con1

Commitments, Guarantees, And Contingent Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Guarantees, Commitments And Contingencies [Abstract]
Schedule Of Guarantees Issued
	(In thousands)	March 31,		December 31,
		2015		2014
	Net unfunded commitments to extend credit 1	$	16,528,689	$	16,658,757
	Standby letters of credit:
	Financial	753,853		745,895
	Performance	191,753		183,482
	Commercial letters of credit	68,807		32,144
	Total unfunded lending commitments	$	17,543,102	$	17,620,278

Retirement_Plans_Tables

Retirement Plans (Tables)	3 Months Ended
	Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans
		Pension benefits						Supplemental				Postretirement
								retirement				benefits
								benefits
	(In thousands)	Three Months Ended March 31,
		2015			2014			2015		2014		2015			2014
	Service cost	$	—		$	—		$	—	$	—	$	8		$	8
	Interest cost	1,783			1,880			101		113		10			12
	Expected return on plan assets	(3,090		)	(3,326		)
	Amortization of prior service cost									13
	Amortization of net actuarial (gain) loss	1,574			797			31		5		(13		)	(18		)
	Net periodic benefit cost (credit)	$	267		$	(649	)	$	132	$	131	$	5		$	2

Operating_Segment_Information_

Operating Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Operating Segment Information [Abstract]
Schedule of Segment Reporting Information, by Segment
	(In millions)	Zions Bank						Amegy					CB&T						NBAZ						NSB
		2015			2014			2015		2014			2015			2014			2015			2014			2015			2014
	CONDENSED INCOME STATEMENT
	Net interest income	$	141.1		$	142.5		$	96.7	$	94.7		$	95.7		$	109.2		$	39		$	40.3		$	28		$	27.9
	Provision for loan losses	(4.6		)	(8.7		)	11.1		16.9			(4.1		)	(2.1		)	0.7			(3.0		)	(8.7		)	(2.6		)
	Net interest income after provision for loan losses	145.7			151.2			85.6		77.8			99.8			111.3			38.3			43.3			36.7			30.5
	Noninterest income	46.8			44			34		32			16.7			5.8			8.5			8.3			9			4.9
	Noninterest expense	127.4			121.5			94		87			74.4			85.3			36.9			37.3			32.1			32.1
	Income (loss) before income taxes	65.1			73.7			25.6		22.8			42.1			31.8			9.9			14.3			13.6			3.3
	Income taxes (benefit)	23.4			26.8			8.5		7.3			16.4			12.1			3.4			5.2			4.6			1
	Net income (loss)	41.7			46.9			17.1		15.5			25.7			19.7			6.5			9.1			9			2.3
	Net income (loss) applicable to noncontrolling interests	0.5			—			—		—			—			—			—			—			—			—
	Net income (loss) applicable to controlling interest	$	41.2		$	46.9		$	17.1	$	15.5		$	25.7		$	19.7		$	6.5		$	9.1		$	9		$	2.3
	AVERAGE BALANCE SHEET DATA
	Total assets	$	18,573		$	18,275		$	13,964	$	13,467		$	11,368		$	10,889		$	4,825		$	4,612		$	4,164		$	3,991
	Cash and due from banks	297			339			183		322			90			166			49			72			71			88
	Money market investments	2,968			3,546			2,046		2,503			1,659			1,129			396			289			734			700
	Total securities	2,468			1,596			285		242			337			327			412			365			840			781
	Total loans	12,180			12,247			10,276		9,362			8,502			8,538			3,764			3,696			2,384			2,306
	Total deposits	16,160			15,980			11,478		11,099			9,701			9,273			4,178			3,952			3,755			3,598
	Shareholder's equity:
	Preferred equity	280			280			226		153			162			162			85			120			50			50
	Common equity	1,633			1,538			1,940		1,849			1,394			1,350			485			422			332			318
	Noncontrolling interests	11			—			—		—			—			—			—			—			—			—
	Total shareholder's equity	1,924			1,818			2,166		2,002			1,556			1,512			570			542			382			368
		Vectra						TCBW					Other						Consolidated
																			Company
		2015			2014			2015		2014			2015			2014			2015			2014
	CONDENSED INCOME STATEMENT
	Net interest income	$	25.7		$	25.3		$	6.7	$	7		$	(15.5	)	$	(30.4	)	$	417.4		$	416.5
	Provision for loan losses	3.8			(1.8		)	0.1		0.7			0.2			—			(1.5		)	(0.6		)
	Net interest income after provision for loan losses	21.9			27.1			6.6		6.3			(15.7		)	(30.4		)	418.9			417.1
	Noninterest income	5			3.8			0.9		(1.0		)	0.9			40.5			121.8			138.3
	Noninterest expense	23.9			25.3			6.9		4.5			1.9			5.1			397.5			398.1
	Income (loss) before income taxes	3			5.6			0.6		0.8			(16.7		)	5			143.2			157.3
	Income taxes (benefit)	0.7			1.8			0.2		0.3			(6.0		)	1.6			51.2			56.1
	Net income (loss)	2.3			3.8			0.4		0.5			(10.7		)	3.4			92			101.2
	Net income (loss) applicable to noncontrolling interests	—			—			—		—			(0.5		)	—			—			—
	Net income (loss) applicable to controlling interest	$	2.3		$	3.8		$	0.4	$	0.5		$	(10.2	)	$	3.4		$	92		$	101.2
	AVERAGE BALANCE SHEET DATA
	Total assets	$	2,977		$	2,569		$	896	$	873		$	51		$	758		$	56,818		$	55,434
	Cash and due from banks	29			47			29		21			(4		)	(17		)	744			1,038
	Money market investments	339			14			119		118			(248		)	(159		)	8,013			8,140
	Total securities	191			164			71		90			179			552			4,783			4,117
	Total loans	2,358			2,280			661		631			54			65			40,179			39,125
	Total deposits	2,568			2,168			766		742			(1,122		)	(1,032		)	47,484			45,780
	Shareholder's equity:
	Preferred equity	25			70			3		3			173			166			1,004			1,004
	Common equity	317			247			90		88			214			(217		)	6,405			5,595
	Noncontrolling interests	—			—			—		—			(11		)	—			—			—
	Total shareholder's equity	342			317			93		91			376			(51		)	7,409			6,599

Basis_of_Presentaion_Details

Basis of Presentaion (Details)	Mar. 31, 2015
	States
Basis Of Presentation [Abstract]
Number of States in which Entity Operates	11

Supplemental_Cash_Flow_Informa2

Supplemental Cash Flow Information (Schedule Of Noncash Activities) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other Significant Noncash Transactions [Line Items]
Loans Transfered to Other Real Estate Owned	$3,568	$6,338
Transfer of Portfolio Loans and Leases to Held-for-sale	13,138	3,789
Subordinated debt converted to preferred stock	15
Amortized Cost of Securities Reclassified from HTM to AFS	$79,276	$0

Offsetting_Assets_and_Liabilit2

Offsetting Assets and Liabilities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	$1,519,352	$1,386,291
Gross amounts recognized	1,519,352	1,386,291
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	1,519,352	1,386,291
Gross amounts not offset in the balance sheet	0	0
Cash Collateral Received/Pledged	0	0
Derivative Financial Instruments, Assets [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	78,857	62,665
Gross amounts recognized	83,978	66,420
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	83,978	66,420
Gross amounts not offset in the balance sheet	-5,121	-3,755
Cash Collateral Received/Pledged	0
Assets, Total [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	1,598,209	1,448,956
Gross amounts recognized	1,603,330	1,452,711
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	1,603,330	1,452,711
Gross amounts not offset in the balance sheet	-5,121	-3,755
Cash Collateral Received/Pledged	0	0
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	203,597	244,223
Gross amounts recognized	203,597	244,223
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	203,597	244,223
Gross amounts not offset in the balance sheet	0	0
Cash Collateral Received/Pledged	0	0
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	37,169	30,341
Gross amounts recognized	81,123	66,064
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	81,123	66,064
Gross amounts not offset in the balance sheet	-5,121	-3,755
Cash Collateral Received/Pledged	-38,833	-31,968
Liabilities, Total [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	240,766	274,564
Gross amounts recognized	284,720	310,287
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	284,720	310,287
Gross amounts not offset in the balance sheet	-5,121	-3,755
Cash Collateral Received/Pledged	($38,833)	($31,968)

Investment_Securities_Narrativ

Investment Securities (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		0 Months Ended
	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015
	Securities	Securities		Y
Investment [Line Items]
Held-to-maturity, Amortized cost	$686,951,000	$590,950,000		590,950,000
Private equity investments prohibited by Volker rule		33,000,000		33,000,000
Number of HTM investment securities in an unrealized loss position	153	188		188
Number of AFS investment securities in an unrealized loss position	458	433		433
Carrying value of pledged securities	1,400,000,000	1,300,000,000		1,300,000,000
Private Equity Investments		132,000,000		132,000,000
Par Value of CDO Securities Sold			993,000,000
Net Gains on Sales of CDOs			31,000,000
Held To Maturity Securities Gross Unrealized Losses	39,699,000
Held-To-Maturity Securities, Unrealized Losses OCI Reduction		18,000,000
Private Equity Investments Sold Prohibited by Volcker Rule	8,000,000	5,000,000		5,000,000
Commitments for Private Equity and Other Noninterest-bearing Investments		34,900,000		34,900,000
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule		8,000,000		8,000,000
U.S. Treasury, Agencies And Corporations [Member] | Minimum [Member]
Investment [Line Items]
Investment term of maturity				1
U.S. Treasury, Agencies And Corporations [Member] | Maximum [Member]
Investment [Line Items]
Investment term of maturity				25
Small Business Administration Loan-Backed Securities [Member] | Minimum [Member]
Investment [Line Items]
Investment term of maturity				5
Small Business Administration Loan-Backed Securities [Member] | Maximum [Member]
Investment [Line Items]
Investment term of maturity				25
Municipal Securities [Member]
Investment [Line Items]
Held-to-maturity, Amortized cost	607,675,000	590,950,000		590,950,000
Held To Maturity Securities Gross Unrealized Losses	0
Asset-backed Securities [Member] | Trust Preferred Securities - Banks And Insurance [Member]
Investment [Line Items]
Held-to-maturity, Amortized cost	79,276,000
Held To Maturity Securities Gross Unrealized Losses	$39,699,000

Investment_Securities_Summary_

Investment Securities (Summary Of Investment Securities) (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Held-to-maturity, fair value	$602,355	$677,196
Held-to-maturity, Amortized cost	590,950	686,951
Held To Maturity Securities Gross Unrealized Gains Losses 1		0
Held To Maturity Securities Gross Unrealized Losses		39,699
Held-to-maturity, Carrying value	590,950	647,252
Available-for-sale Debt Securities, Amortized Cost Basis	4,430,090	3,819,297
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	35,140	31,603
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	167,418	142,275
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	4,297,812
Available-for-sale debt securities, Estimated fair value	4,297,812	3,708,625
Available-for-sale Securities, Gross Unrealized Gain	35,241	31,679
Available-for-sale equity securities, Carrying value		3,708,625
Available-for-sale, Amortized cost	4,583,325	3,955,888
Available-for-sale, Gross unrealized losses, Recognized in OCI	168,064	143,319
Carrying value	4,450,502	3,844,248
Available-for-sale securities, Estimated fair value	4,450,502	3,844,248
Held-to-maturity Securities, Unrecognized Holding Gain		31,411
Held-to-maturity Securities, Unrecognized Holding Loss		1,467
amortized cost of investment securities	5,174,275	4,642,839
Gross Unrealized Gains of Investment Securities Recognized in OCI	47,449	31,679
Gross Unrealized Losses of Investment Securities Recognized in OCI	168,867	183,018
Carrying Value of Investment Securities	5,052,857	4,491,500
Estimated Fair Value of Investment Securities		4,521,444
Municipal Securities [Member]
Investment [Line Items]
Held-to-maturity, fair value		619,889
Held-to-maturity, Amortized cost	590,950	607,675
Held To Maturity Securities Gross Unrealized Gains Losses 1		0
Held To Maturity Securities Gross Unrealized Losses		0
Held-to-maturity, Carrying value	602,355	607,675
Available-for-sale Debt Securities, Amortized Cost Basis	175,017	189,059
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	1,282	1,143
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	689	945
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	175,610	189,257
Available-for-sale debt securities, Estimated fair value		189,257
Held-to-maturity Securities, Unrecognized Holding Gain	12,208	13,018
Held-to-maturity Securities, Unrecognized Holding Loss	803	804
Trust Preferred Securities - Banks And Insurance [Member] | Asset-backed Securities [Member]
Investment [Line Items]
Held-to-maturity, fair value		57,307
Held-to-maturity, Amortized cost		79,276
Held To Maturity Securities Gross Unrealized Gains Losses 1		0
Held To Maturity Securities Gross Unrealized Losses		39,699
Held-to-maturity, Carrying value		39,577
Available-for-sale Debt Securities, Amortized Cost Basis	611,836
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	99	103
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	150,418	121,984
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	461,517
Available-for-sale equity securities, Carrying value		415,708
Available-for-sale, Amortized cost		537,589
Available-for-sale securities, Estimated fair value		415,708
Held-to-maturity Securities, Unrecognized Holding Gain		18,393
Held-to-maturity Securities, Unrecognized Holding Loss		663
Agency Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	631,603	607,523
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	1,406	1,572
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	7,139	8,343
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	625,870	600,752
Available-for-sale debt securities, Estimated fair value		600,752
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,417,843	935,164
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	16,441	12,132
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	614	2,105
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	1,433,670	945,191
Available-for-sale debt securities, Estimated fair value		945,191
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,588,562	1,544,710
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	15,677	16,446
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	8,558	8,891
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	1,595,681	1,552,265
Available-for-sale debt securities, Estimated fair value		1,552,265
Auction Rate Securities [Member] | Asset-backed Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	5,229
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	235	207
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	0	7
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	5,464
Available-for-sale equity securities, Carrying value		5,452
Available-for-sale, Amortized cost		5,252
Available-for-sale securities, Estimated fair value		5,452
Mutual Funds And Other [Member]
Investment [Line Items]
Available-for-sale Securities, Gross Unrealized Gain		76
Available-for-sale, Amortized cost		136,591
Available-for-sale, Gross unrealized losses, Recognized in OCI		1,044
Carrying value		135,623
Available-for-sale securities, Estimated fair value		135,623
Mutual Funds And Stock [Member]
Investment [Line Items]
Available-for-sale Securities, Gross Unrealized Gain	101
Available-for-sale, Amortized cost	153,235
Available-for-sale, Gross unrealized losses, Recognized in OCI	646
Carrying value	$152,690

Investment_Securities_Contract

Investment Securities (Contractual Maturities Debt Securities) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Investments [Abstract]
Held-to-maturity, Due in one year or less, Amortized cost	$96,220
Held-to-maturity, Due in one year or less, Estimated fair value	97,409
Held-to-maturity, Due after one year through five years, Amortized cost	188,507
Held-to-maturity, Due after one year through five years, Estimated fair value	191,799
Held-to-maturity, Due after five years through ten years, Amortized cost	158,244
Held-to-maturity, Due after five years through ten years, Estimated fair value	164,415
Held-to-maturity, Due after ten years, Amortized cost	147,979
Held-to-maturity, Due after ten years, Estimated fair value	148,732
Held-to-maturity, Amortized cost	590,950	686,951
Held-to-maturity, fair value	602,355	677,196
Available-for-sale, Due in one year or less, Amortized cost	639,077
Available-for-sale, Due in one year or less, Estimated fair value	638,407
Available-for-sale, Due after one year through five years, Amortized cost	1,719,501
Available-for-sale, Due after one year through five years, Estimated fair value	1,718,550
Available-for-sale, Due after five years through ten years, Amortized cost	1,155,325
Available-for-sale, Due after five years through ten years, Estimated fair value	1,146,764
Available-for-sale, Due after ten years, Amortized cost	916,187
Available-for-sale, Due after ten years, Estimated fair value	794,091
Available-for-sale, Amortized cost	4,430,090	3,819,297
Available-for-sale, Estimated fair value	$4,297,812	$3,708,625

Investment_Securities_Summary_1

Investment Securities (Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value) (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	$8,395	$13,602
Available-for-sale, Less than 12 months - Estimated fair value	878,929	1,326,690
Available-for-sale, 12 months or more - Gross unrealized losses	159,669	129,717
Available-for-sale, 12 months or more - Estimated fair value	1,013,150	699,056
Available-for-sale, Total - Gross unrealized losses	168,064	143,319
Available-for-sale, Total - Estimated fair value	1,892,079	2,025,746
Investment Securities Gross Unrealized Losses Less Than 12 Months	9,117	14,182
Investment Securities Estimated Fair Value Less Than 12 Months	972,132	1,389,574
Investment Securities Gross Unrealized Losses 12 Months or More	159,750	170,303
Investment Securities Estimated Fair Value 12 Months or More	1,016,981	770,245
Investment Securities Gross Unrealized Losses Total	168,867	184,485
Investment Securities Estimated Fair Value Total	1,989,113	2,159,819
Municipal Securities [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses	722	527
Held-to-maturity, Less than 12 months - Estimated fair value	93,203	62,762
Held-to-maturity, 12 months or more - Gross unrealized losses	81	277
Held-to-maturity, 12 months or more - Estimated fair value	3,831	14,003
Held-to-maturity, Total - Gross unrealized losses	803	804
Held-to-maturity, Total - Estimated fair value	97,034	76,765
Available-for-sale, Less than 12 months - Gross unrealized losses	129	258
Available-for-sale, Less than 12 months - Estimated fair value	28,134	36,551
Available-for-sale, 12 months or more - Gross unrealized losses	560	687
Available-for-sale, 12 months or more - Estimated fair value	2,916	4,616
Available-for-sale, Total - Gross unrealized losses	689	945
Available-for-sale, Total - Estimated fair value	31,050	41,167
Agency Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	2,631	4,510
Available-for-sale, Less than 12 months - Estimated fair value	139,038	295,694
Available-for-sale, 12 months or more - Gross unrealized losses	4,508	3,833
Available-for-sale, 12 months or more - Estimated fair value	287,134	101,188
Available-for-sale, Total - Gross unrealized losses	7,139	8,343
Available-for-sale, Total - Estimated fair value	426,172	396,882
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	438	1,914
Available-for-sale, Less than 12 months - Estimated fair value	178,832	425,114
Available-for-sale, 12 months or more - Gross unrealized losses	176	191
Available-for-sale, 12 months or more - Estimated fair value	12,750	12,124
Available-for-sale, Total - Gross unrealized losses	614	2,105
Available-for-sale, Total - Estimated fair value	191,582	437,238
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	4,551	5,869
Available-for-sale, Less than 12 months - Estimated fair value	460,629	495,817
Available-for-sale, 12 months or more - Gross unrealized losses	4,007	3,022
Available-for-sale, 12 months or more - Estimated fair value	264,312	175,523
Available-for-sale, Total - Gross unrealized losses	8,558	8,891
Available-for-sale, Total - Estimated fair value	724,941	671,340
Mutual Funds And Other [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	646	1,044
Available-for-sale, Less than 12 months - Estimated fair value	72,296	71,907
Available-for-sale, 12 months or more - Gross unrealized losses	0	0
Available-for-sale, 12 months or more - Estimated fair value	0	0
Available-for-sale, Total - Gross unrealized losses	646	1,044
Available-for-sale, Total - Estimated fair value	72,296	71,907
Held-to-maturity Securities [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses		580
Held-to-maturity, Less than 12 months - Estimated fair value		62,884
Held-to-maturity, 12 months or more - Gross unrealized losses		40,586
Held-to-maturity, 12 months or more - Estimated fair value		71,189
Held-to-maturity, Total - Gross unrealized losses		41,166
Held-to-maturity, Total - Estimated fair value		134,073
Available-for-sale Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	7,749	12,558
Available-for-sale, Less than 12 months - Estimated fair value	806,633	1,254,783
Available-for-sale, 12 months or more - Gross unrealized losses	159,669	129,717
Available-for-sale, 12 months or more - Estimated fair value	1,013,150	699,056
Available-for-sale, Total - Gross unrealized losses	167,418	142,275
Available-for-sale, Total - Estimated fair value	1,819,783	1,953,839
Asset-backed Securities [Member] | Trust Preferred Securities - Banks And Insurance [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses		53
Held-to-maturity, Less than 12 months - Estimated fair value		122
Held-to-maturity, 12 months or more - Gross unrealized losses		40,309
Held-to-maturity, 12 months or more - Estimated fair value		57,186
Held-to-maturity, Total - Gross unrealized losses		40,362
Held-to-maturity, Total - Estimated fair value		57,308
Available-for-sale, Less than 12 months - Gross unrealized losses	0	0
Available-for-sale, Less than 12 months - Estimated fair value	0	0
Available-for-sale, 12 months or more - Gross unrealized losses	150,418	121,984
Available-for-sale, 12 months or more - Estimated fair value	446,038	405,605
Available-for-sale, Total - Gross unrealized losses	150,418	121,984
Available-for-sale, Total - Estimated fair value	446,038	405,605
Asset-backed Securities [Member] | Auction Rate Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses		7
Available-for-sale, Less than 12 months - Estimated fair value		1,607
Available-for-sale, 12 months or more - Gross unrealized losses		0
Available-for-sale, 12 months or more - Estimated fair value		0
Available-for-sale, Total - Gross unrealized losses		7
Available-for-sale, Total - Estimated fair value		$1,607

Investment_Securities_Rollforw

Investment Securities (Rollforward Of Total Amount Of Credit-Related OTTI) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Investment [Line Items]
Balance of credit-related OTTI at beginning of period	($104,551)	($185,885)
Credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost basis	0	-27
Reductions for securities sold during the period	1,313	12,919
Balance of credit-related OTTI at end of period	-103,238	-172,993
Transfer of Securities from HTM to AFS	0	0
Held-to-maturity Securities [Member]
Investment [Line Items]
Balance of credit-related OTTI at beginning of period	-9,079	-9,052
Credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost basis	0	-27
Reductions for securities sold during the period	0	0
Balance of credit-related OTTI at end of period	0	-9,079
Transfer of Securities from HTM to AFS	9,079	0
Available-for-sale Securities [Member]
Investment [Line Items]
Balance of credit-related OTTI at beginning of period	-95,472	-176,833
Credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost basis	0	0
Reductions for securities sold during the period	1,313	12,919
Balance of credit-related OTTI at end of period	-103,238	-163,914
Transfer of Securities from HTM to AFS	($9,079)	$0

Investment_Securities_Gains_An

Investment Securities (Gains And Losses, Including OTTI, Recognized In Statement Of Income) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Investments [Abstract]
Investment securities, Held-to-maturity, Gross gains	$1	$0
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities	0	27
Investment securities, Available-for-sale, Gross gains	958	72,561
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	1,198	41,647
Other noninterest-bearing investments, Nonmarketable equity securities, Gross gains	3,595	912
Other noninterest-bearing investments, Nonmarketable equity securities, Gross losses	242	0
Total investment securities and other noninterest-bearing investments, Gross gains	4,554	73,473
Total investment securities and other noninterest-bearing investments, Gross losses	1,440	41,674
Net losses	3,114	31,799
Net impairment losses on investment securities	0	-27
Equity securities gains (losses)	3,353	912
Fixed income securities gains (losses), net	($239)	$30,914

Investment_Securities_Taxable_

Investment Securities Taxable and Nontaxable Interest Income by Investment Type (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Noninterest Income	$27,473	$28,094
Taxable [Member]
Noninterest Income	23,958	24,734
Nontaxable [Member]
Noninterest Income	3,515	3,360
Held-to-maturity Securities [Member]
Noninterest Income	6,454	6,664
Held-to-maturity Securities [Member] | Taxable [Member]
Noninterest Income	3,592	3,828
Held-to-maturity Securities [Member] | Nontaxable [Member]
Noninterest Income	2,862	2,836
Available-for-sale Securities [Member]
Noninterest Income	20,421	20,948
Available-for-sale Securities [Member] | Taxable [Member]
Noninterest Income	19,768	20,424
Available-for-sale Securities [Member] | Nontaxable [Member]
Noninterest Income	653	524
Trading Securities [Member]
Noninterest Income	598	482
Trading Securities [Member] | Taxable [Member]
Noninterest Income	598	482
Trading Securities [Member] | Nontaxable [Member]
Noninterest Income	$0	$0

Loans_And_Allowance_For_Credit2

Loans And Allowance For Credit Losses (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2014
	Billing_Cycles
	D
	M
	Payments
Loans And Allowance For Credit Losses [Line Items]
Certain Loans Account for as Cash Basis, Net Carrying Amounts					$5,300,000
Threshold for Internal risk grades assigned to commercial and commercial real estate loans	750,000
Unused Commitments to Extend Credit	7,500,000				6,100,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	-800,000	-2,700,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2,424,000	327,000	74,500,000	142,400,000
Unearned income and fees, net of related costs	142,800,000				144,700,000
Owner occupied and commercial real estate loans, unamortized premiums	33,700,000				36,500,000
Land Development Loans	462,700,000				484,900,000
Loans at carrying value pledged as collateral for current and potential borrowings	22,600,000,000				22,500,000,000
Payments for Origination and Purchases of Loans Held-for-sale	309,700,000	295,500,000
Loans and Leases Receivable, Gain (Loss) on Sales, Net	4,600,000	3,500,000
Principle amount of loans held for sale sold	300,400,000	337,600,000
Servicing Asset at Amortized Cost	0				0
Number of days for consumer loans to be charged off	180
Number of days for closed-end loans to be charged off	120
Minimum number of days past due for nonaccrual status	90
Minimum number of monthly payments in arrears when reporting past due	2
Minimum number of billing cycles in arrears when reported as past due	2
Minimum number of days unpaid when reported as past due	30
Threshold for nonaccrual loans for evaluation of impairment	1,000,000
Minimum number of months for borrower to meet terms For TDR status	6
Recorded investment in TDR loans modified with interest rates below market	198,600,000				219,300,000
Total reversal amount to ALLL	1,400,000	2,900,000
Additional interest income due to increased cash flows from acquired loans	7,400,000	18,500,000
Provision for Loan and Lease Losses	-1,494,000	-610,000
Provision for Unfunded Lending Commitments	1,211,000	1,012,000
Other Real Estate, Foreclosed Assets, and Repossessed Assets	4,800,000
Other Real Estate, In Process of Forecloseing Assets	10,500,000
Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Subsequent payment default period, number of days	90
Provision for Loan and Lease Losses	24,934,000	11,260,000
Provision for Unfunded Lending Commitments	3,844,000	1,525,000
Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Subsequent payment default period, number of days	60
Provision for Loan and Lease Losses	459,000	-8,979,000
Provision for Unfunded Lending Commitments	$53,000	($325,000)

Loans_And_Allowance_For_Credit3

Loans And Allowance For Credit Losses (Summary Of Major Portfolio Segment And Specific Loan Class) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at end of period	$620,013	$736,953	$604,663	$746,291
Loans held for sale	128,946		132,504
Commercial and industrial	13,264,092		13,162,955
Leasing	407,137		408,974
Owner occupied	7,309,639		7,351,548
Municipal	555,122		520,887
Total commercial	21,535,990		21,444,364
Construction and land development	2,044,641		1,986,408
Term	8,088,430		8,126,600
Total commercial real estate	10,133,071		10,113,008
Home equity credit line	2,314,806		2,321,150
1-4 family residential	5,212,963		5,200,882
Construction and other consumer real estate	373,335		370,542
Bankcard and other revolving plans	406,723		401,352
Other	203,226		212,360
Total consumer	8,511,053		8,506,286
Total loans	40,180,114		40,063,658
Provision for loan losses	1,494	610
Change In Allowance Covered By F D I C Indemnification	38	817
Allowance for Loan and Lease Losses, Write-offs	-20,188	-20,795
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	37,070	12,884
Net loan and lease charge-offs	16,882	-7,911
Reserve for unfunded lending commitments	82,287	88,693	81,076	89,705
Provision for Unfunded Lending Commitments	1,211	1,012
Total allowance for credit losses	702,300	825,646
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at end of period	46,326	51,103	47,140	61,066
Home equity credit line	2,314,806		2,321,150
1-4 family residential	5,212,963		5,200,882
Construction and other consumer real estate	373,335		370,542
Bankcard and other revolving plans	406,723		401,352
Other	203,226		212,360
Total consumer	8,511,053		8,506,286
Total loans	8,511,053		8,506,286
Provision for loan losses	-459	8,979
Change In Allowance Covered By F D I C Indemnification		36
Allowance for Loan and Lease Losses, Write-offs	-3,611	-3,145
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	2,338	2,197
Net loan and lease charge-offs	-1,273	-948
Reserve for unfunded lending commitments	575	3,550	628	3,875
Provision for Unfunded Lending Commitments	53	-325
Total allowance for credit losses	46,901	54,653
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at end of period	131,615	208,149	145,009	216,012
Term	8,088,430		8,126,600
Total commercial real estate	10,133,071		10,113,008
Total loans	10,133,071		10,113,008
Provision for loan losses	-26,887	2,891
Change In Allowance Covered By F D I C Indemnification		0
Allowance for Loan and Lease Losses, Write-offs	-626	-7,854
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	14,119	2,882
Net loan and lease charge-offs	13,493	-4,972
Reserve for unfunded lending commitments	18,937	35,273	21,517	37,485
Provision for Unfunded Lending Commitments	2,580	2,212
Total allowance for credit losses	150,552	243,422
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at end of period	442,072	477,701	412,514	469,213
Commercial and industrial	13,264,092		13,162,955
Leasing	407,137		408,974
Owner occupied	7,309,639		7,351,548
Municipal	555,122		520,887
Total commercial	21,535,990		21,444,364
Total loans	21,535,990		21,444,364
Provision for loan losses	-24,934	-11,260
Change In Allowance Covered By F D I C Indemnification	38	781
Allowance for Loan and Lease Losses, Write-offs	-15,951	-9,796
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	20,613	7,805
Net loan and lease charge-offs	4,662	-1,991
Reserve for unfunded lending commitments	62,775	49,870	58,931	48,345
Provision for Unfunded Lending Commitments	3,844	1,525
Total allowance for credit losses	$504,847	$527,571

Loans_And_Allowance_For_Credit4

Loans And Allowance For Credit Losses (Summary Of Changes In The Allowance For Credit Losses) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	$1,494	$610
Change In Allowance Covered By F D I C Indemnification	-38	-817
Allowance for Loan and Lease Losses, Write-offs	-20,188	-20,795
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	604,663	746,291
Net loan and lease charge-offs	16,882	-7,911
Balance at end of period	82,287	88,693	81,076	89,705
Allowance for loan losses	620,013	736,953
Reserve for unfunded lending commitments	82,287	88,693	81,076	89,705
Total allowance for credit losses	702,300	825,646
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	37,070	12,884
Provision for Unfunded Lending Commitments	1,211	1,012
Balance at end of period	620,013	736,953
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	-24,934	-11,260
Change In Allowance Covered By F D I C Indemnification	-38	-781
Allowance for Loan and Lease Losses, Write-offs	-15,951	-9,796
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	412,514	469,213
Net loan and lease charge-offs	4,662	-1,991
Balance at end of period	62,775	49,870	58,931	48,345
Allowance for loan losses	442,072	477,701
Reserve for unfunded lending commitments	62,775	49,870	58,931	48,345
Total allowance for credit losses	504,847	527,571
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	20,613	7,805
Provision for Unfunded Lending Commitments	3,844	1,525
Balance at end of period	442,072	477,701
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	-26,887	2,891
Change In Allowance Covered By F D I C Indemnification		0
Allowance for Loan and Lease Losses, Write-offs	-626	-7,854
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	145,009	216,012
Net loan and lease charge-offs	13,493	-4,972
Balance at end of period	18,937	35,273	21,517	37,485
Allowance for loan losses	131,615	208,149
Reserve for unfunded lending commitments	18,937	35,273	21,517	37,485
Total allowance for credit losses	150,552	243,422
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	14,119	2,882
Provision for Unfunded Lending Commitments	2,580	2,212
Balance at end of period	131,615	208,149
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	-459	8,979
Change In Allowance Covered By F D I C Indemnification		-36
Allowance for Loan and Lease Losses, Write-offs	-3,611	-3,145
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	47,140	61,066
Net loan and lease charge-offs	-1,273	-948
Balance at end of period	575	3,550	628	3,875
Allowance for loan losses	46,326	51,103
Reserve for unfunded lending commitments	575	3,550	628	3,875
Total allowance for credit losses	46,901	54,653
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	2,338	2,197
Provision for Unfunded Lending Commitments	53	-325
Balance at end of period	$46,326	$51,103

Loans_And_Allowance_For_Credit5

Loans And Allowance For Credit Losses (Summary Of ALLL And Outstanding Loan Balances According To The Company's Impairment Method) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$620,253	$907,227
Impaired Financing Receivable, Interest Income, Accrual Method	12,470	26,545
Allowance for loan losses: Individually evaluated for impairment	-53,145		-41,713
Allowance for loan losses: Collectively evaluated for impairment	565,430		560,150
Allowance for loan losses: Purchased loans with evidence of credit deterioration	1,438		2,800
Allowance for loan losses: Total	620,013	736,953	604,663	746,291
Outstanding loan balances: Individually evaluated for impairment	535,221		521,909
Outstanding loan balances: Collectively evaluated for impairment	39,482,003		39,362,450
Outstanding loan balances: Purchased loans with evidence of credit deterioration	162,890		179,299
Total loans	40,180,114		40,063,658
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	160,013	188,191
Impaired Financing Receivable, Interest Income, Accrual Method	1,451	2,591
Total loans	13,264,092		13,162,955
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	177,568	237,902
Impaired Financing Receivable, Interest Income, Accrual Method	4,092	4,758
Total loans	7,309,639		7,351,548
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	-38,382		-28,627
Allowance for loan losses: Collectively evaluated for impairment	402,597		382,552
Allowance for loan losses: Purchased loans with evidence of credit deterioration	1,093		1,335
Allowance for loan losses: Total	442,072	477,701	412,514	469,213
Outstanding loan balances: Individually evaluated for impairment	305,678		259,207
Outstanding loan balances: Collectively evaluated for impairment	21,156,592		21,105,217
Outstanding loan balances: Purchased loans with evidence of credit deterioration	73,720		79,940
Total loans	21,535,990		21,444,364
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	-5,326		-4,027
Allowance for loan losses: Collectively evaluated for impairment	126,231		140,090
Allowance for loan losses: Purchased loans with evidence of credit deterioration	58		892
Allowance for loan losses: Total	131,615	208,149	145,009	216,012
Outstanding loan balances: Individually evaluated for impairment	141,470		167,435
Outstanding loan balances: Collectively evaluated for impairment	9,917,574		9,861,862
Outstanding loan balances: Purchased loans with evidence of credit deterioration	74,027		83,711
Total loans	10,133,071		10,113,008
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	-9,437		-9,059
Allowance for loan losses: Collectively evaluated for impairment	36,602		37,508
Allowance for loan losses: Purchased loans with evidence of credit deterioration	287		573
Allowance for loan losses: Total	46,326	51,103	47,140	61,066
Outstanding loan balances: Individually evaluated for impairment	88,073		95,267
Outstanding loan balances: Collectively evaluated for impairment	8,407,837		8,395,371
Outstanding loan balances: Purchased loans with evidence of credit deterioration	15,143		15,648
Total loans	8,511,053		8,506,286
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	338,614	426,093
Impaired Financing Receivable, Interest Income, Accrual Method	5,543	7,349
Total loans	21,535,990		21,444,364
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	38,736	66,772
Impaired Financing Receivable, Interest Income, Accrual Method	569	3,538
Total loans	2,044,641		1,986,408
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	143,496	293,802
Impaired Financing Receivable, Interest Income, Accrual Method	5,008	14,183
Total loans	8,088,430		8,126,600
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	182,232	360,574
Impaired Financing Receivable, Interest Income, Accrual Method	5,577	17,721
Total loans	10,133,071		10,113,008
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	25,386	25,224
Impaired Financing Receivable, Interest Income, Accrual Method	413	402
Total loans	2,314,806		2,321,150
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	66,711	83,241
Impaired Financing Receivable, Interest Income, Accrual Method	510	540
Total loans	5,212,963		5,200,882
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2,560	3,490
Impaired Financing Receivable, Interest Income, Accrual Method	42	38
Total loans	373,335		370,542
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2	10
Impaired Financing Receivable, Interest Income, Accrual Method	100	1
Total loans	406,723		401,352
Consumer Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	4,748	8,595
Impaired Financing Receivable, Interest Income, Accrual Method	285	494
Total loans	203,226		212,360
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	99,407	120,560
Impaired Financing Receivable, Interest Income, Accrual Method	1,350	1,475
Total loans	$8,511,053		$8,506,286

Loans_And_Allowance_For_Credit6

Loans And Allowance For Credit Losses (Summary Of Nonaccrual Loans) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$382,066	$306,648
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	163,499	105,591
Leasing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	247	295
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	97,609	87,243
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,027	1,056
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	262,382	194,185
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	22,101	23,880
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	37,517	25,107
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	59,618	48,987
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	10,337	11,430
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	48,078	49,861
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,301	1,735
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	318	196
Consumer Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	32	254
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$60,066	$63,476

Loans_And_Allowance_For_Credit7

Loans And Allowance For Credit Losses (Summary Of Past Due Loans (Accruing And Nonaccruing)) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	$39,880,380		$39,796,072
30-89 days past due	142,643		104,491
90+ days past due	157,091		163,095
Total past due	299,734		267,586
Total loans	40,180,114		40,063,658
Accruing loans 90+ days past due	31,552		29,228
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	211,126	[1]	154,778	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	382,066		306,648
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	21,535,990		21,444,364
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	21,364,561		21,298,184
30-89 days past due	89,589		57,702
90+ days past due	81,840		88,478
Total past due	171,429		146,180
Total loans	21,535,990		21,444,364
Accruing loans 90+ days past due	5,216		8,011
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	151,717	[1]	105,360	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	262,382		194,185
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	10,133,071		10,113,008
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	8,511,053		8,506,286
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	8,450,473		8,442,742
30-89 days past due	31,732		29,663
90+ days past due	28,848		33,881
Total past due	60,580		63,544
Total loans	8,511,053		8,506,286
Accruing loans 90+ days past due	1,836		1,425
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	24,673	[1]	23,150	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	60,066		63,476
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	13,182,403		13,092,731
30-89 days past due	42,881		28,295
90+ days past due	38,808		41,929
Total past due	81,689		70,224
Total loans	13,264,092		13,162,955
Accruing loans 90+ days past due	2,969		4,677
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	109,978	[1]	64,385	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	163,499		105,591
Leasing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	406,902		408,724
30-89 days past due	208		225
90+ days past due	27		25
Total past due	235		250
Total loans	407,137		408,974
Accruing loans 90+ days past due	0		0
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	197	[1]	270	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	247		295
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	7,222,254		7,275,842
30-89 days past due	44,380		29,182
90+ days past due	43,005		46,524
Total past due	87,385		75,706
Total loans	7,309,639		7,351,548
Accruing loans 90+ days past due	2,247		3,334
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	40,515	[1]	39,649	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	97,609		87,243
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	553,002		520,887
30-89 days past due	2,120		0
90+ days past due	0		0
Total past due	2,120		0
Total loans	555,122		520,887
Accruing loans 90+ days past due	0		0
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	1,027	[1]	1,056	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,027		1,056
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	2,027,240		1,972,206
30-89 days past due	4,114		2,711
90+ days past due	13,287		11,491
Total past due	17,401		14,202
Total loans	2,044,641		1,986,408
Accruing loans 90+ days past due	2,590		92
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	11,338	[1]	12,481	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	22,101		23,880
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	8,038,106		8,082,940
30-89 days past due	17,208		14,415
90+ days past due	33,116		29,245
Total past due	50,324		43,660
Total loans	8,088,430		8,126,600
Accruing loans 90+ days past due	21,910		19,700
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	23,398	[1]	13,787	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	37,517		25,107
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	10,065,346		10,055,146
30-89 days past due	21,322		17,126
90+ days past due	46,403		40,736
Total past due	67,725		57,862
Total loans	10,133,071		10,113,008
Accruing loans 90+ days past due	24,500		19,792
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	34,736	[1]	26,268	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	59,618		48,987
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	2,302,583		2,309,967
30-89 days past due	4,522		4,503
90+ days past due	7,701		6,680
Total past due	12,223		11,183
Total loans	2,314,806		2,321,150
Accruing loans 90+ days past due	0		1
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	1,103	[1]	1,779	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	10,337		11,430
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	5,181,356		5,163,610
30-89 days past due	12,780		12,416
90+ days past due	18,827		24,856
Total past due	31,607		37,272
Total loans	5,212,963		5,200,882
Accruing loans 90+ days past due	268		318
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	22,781	[1]	20,599	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	48,078		49,861
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	361,483		359,723
30-89 days past due	10,682		9,675
90+ days past due	1,170		1,144
Total past due	11,852		10,819
Total loans	373,335		370,542
Accruing loans 90+ days past due	556		160
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	664	[1]	608	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,301		1,735
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	402,775		397,882
30-89 days past due	2,859		2,425
90+ days past due	1,089		1,045
Total past due	3,948		3,470
Total loans	406,723		401,352
Accruing loans 90+ days past due	951		946
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	98	[1]	80	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	318		196
Consumer Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	202,276		211,560
30-89 days past due	889		644
90+ days past due	61		156
Total past due	950		800
Total loans	203,226		212,360
Accruing loans 90+ days past due	61		0
Financing Receivable Recorded Investment Nonaccrual Status That Are Current	27	[1]	84	[1]
Financing Receivable, Recorded Investment, Nonaccrual Status	$32		$254
[1]	Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

Loans_And_Allowance_For_Credit8

Loans And Allowance For Credit Losses (Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans held for sale	$128,946	$132,504
Commercial and industrial	13,264,092	13,162,955
Leasing	407,137	408,974
Owner occupied	7,309,639	7,351,548
Municipal	555,122	520,887
Total commercial	21,535,990	21,444,364
Construction and land development	2,044,641	1,986,408
Term	8,088,430	8,126,600
Total commercial real estate	10,133,071	10,113,008
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,314,806	2,321,150
1-4 family residential	5,212,963	5,200,882
Loans and Leases Receivable, Gross, Consumer, Construction	373,335	370,542
Bankcard and other revolving plans	406,723	401,352
Other	203,226	212,360
Total consumer	8,511,053	8,506,286
Total loans	40,180,114	40,063,658
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,314,806	2,321,150
1-4 family residential	5,212,963	5,200,882
Loans and Leases Receivable, Gross, Consumer, Construction	373,335	370,542
Bankcard and other revolving plans	406,723	401,352
Other	203,226	212,360
Total consumer	8,511,053	8,506,286
Total loans	8,511,053	8,506,286
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	8,088,430	8,126,600
Total commercial real estate	10,133,071	10,113,008
Total loans	10,133,071	10,113,008
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	2,044,641	1,986,408
Total loans	2,044,641	1,986,408
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	13,264,092	13,162,955
Leasing	407,137	408,974
Owner occupied	7,309,639	7,351,548
Municipal	555,122	520,887
Total commercial	21,535,990	21,444,364
Total loans	21,535,990	21,444,364
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	38,383,629	38,428,158
Pass [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,298,505	2,304,352
1-4 family residential	5,149,513	5,138,660
Loans and Leases Receivable, Gross, Consumer, Construction	370,817	367,932
Bankcard and other revolving plans	404,826	399,446
Other	202,909	211,811
Total consumer	8,426,570	8,422,201
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	7,827,313	7,802,571
Total commercial real estate	9,821,385	9,728,256
Pass [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	1,994,072	1,925,685
Pass [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	12,342,163	12,515,846
Leasing	388,843	399,032
Owner occupied	6,851,794	6,844,310
Municipal	552,874	518,513
Total commercial	20,135,674	20,277,701
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	527,739	488,635
Special Mention [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	0	0
1-4 family residential	0	0
Loans and Leases Receivable, Gross, Consumer, Construction	0	0
Bankcard and other revolving plans	0	0
Other	0	0
Total consumer	0	0
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	68,890	96,347
Total commercial real estate	77,405	104,811
Special Mention [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	8,515	8,464
Special Mention [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	325,604	209,215
Leasing	11,656	4,868
Owner occupied	111,853	168,423
Municipal	1,221	1,318
Total commercial	450,334	383,824
Total Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	620,013	604,663
Total Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total consumer	46,326	47,140
Total Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total commercial real estate	131,615	145,009
Total Allowance [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total commercial	442,072	412,514
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	13,481	16,250
Doubtful [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	0	0
1-4 family residential	0	0
Loans and Leases Receivable, Gross, Consumer, Construction	0	0
Bankcard and other revolving plans	0	0
Other	0	0
Total consumer	0	0
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	4,428	4,358
Total commercial real estate	4,428	4,358
Doubtful [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	0	0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	9,053	11,892
Leasing	0	0
Owner occupied	0	0
Municipal	0	0
Total commercial	9,053	11,892
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,255,265	1,130,615
Substandard [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	16,301	16,798
1-4 family residential	63,450	62,222
Loans and Leases Receivable, Gross, Consumer, Construction	2,518	2,610
Bankcard and other revolving plans	1,897	1,906
Other	317	549
Total consumer	84,483	84,085
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Term	187,799	223,324
Total commercial real estate	229,853	275,583
Substandard [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development	42,054	52,259
Substandard [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial	587,272	426,002
Leasing	6,638	5,074
Owner occupied	345,992	338,815
Municipal	1,027	1,056
Total commercial	$940,929	$770,947

Loans_And_Allowance_For_Credit9

Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	$2,314,806		$2,321,150
Unpaid principal balance	783,075		777,333
Recorded investment	644,154		628,728
Impaired Financing Receivable, Related Allowance	52,439		42,354
Average recorded investment	620,253	907,227
Interest income recognized	12,470	26,545
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	223,938		185,520
Recorded investment	181,613		146,822
Impaired Financing Receivable, Related Allowance	30,899		22,852
Average recorded investment	160,013	188,191
Interest income recognized	1,451	2,591
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	202,999		198,231
Recorded investment	176,075		169,561
Impaired Financing Receivable, Related Allowance	7,341		6,087
Average recorded investment	177,568	237,902
Interest income recognized	4,092	4,758
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,505		1,535
Recorded investment	1,027		1,056
Impaired Financing Receivable, Related Allowance	0		0
Average recorded investment	1,033	0
Interest income recognized	0	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	428,442		385,286
Recorded investment	358,715		317,439
Impaired Financing Receivable, Related Allowance	38,240		28,939
Average recorded investment	338,614	426,093
Interest income recognized	5,543	7,349
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	55,316		60,993
Recorded investment	38,462		43,477
Impaired Financing Receivable, Related Allowance	1,293		1,773
Average recorded investment	38,736	66,772
Interest income recognized	569	3,538
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	180,822		203,788
Recorded investment	146,931		160,091
Impaired Financing Receivable, Related Allowance	3,550		2,345
Average recorded investment	143,496	293,802
Interest income recognized	5,008	14,183
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	236,138		264,781
Recorded investment	185,393		203,568
Impaired Financing Receivable, Related Allowance	4,843		4,118
Average recorded investment	182,232	360,574
Interest income recognized	5,577	17,721
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	29,149		30,209
Recorded investment	25,779		26,681
Impaired Financing Receivable, Related Allowance	189		437
Average recorded investment	25,386	25,224
Interest income recognized	413	402
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,314,806		2,321,150
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	80,023		86,575
Recorded investment	67,037		72,927
Impaired Financing Receivable, Related Allowance	8,885		8,494
Average recorded investment	66,711	83,241
Interest income recognized	510	540
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,498		3,902
Recorded investment	2,556		2,859
Impaired Financing Receivable, Related Allowance	187		233
Average recorded investment	2,560	3,490
Interest income recognized	42	38
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	0		0
Recorded investment	0		0
Impaired Financing Receivable, Related Allowance	0		0
Average recorded investment	2	10
Interest income recognized	100	1
Consumer Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	5,825		6,580
Recorded investment	4,674		5,254
Impaired Financing Receivable, Related Allowance	95		133
Average recorded investment	4,748	8,595
Interest income recognized	285	494
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	118,495		127,266
Recorded investment	100,046		107,721
Impaired Financing Receivable, Related Allowance	9,356		9,297
Average recorded investment	99,407	120,560
Interest income recognized	1,350	1,475
Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	330,773		335,042
Impaired Financing Receivable Related Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	147,353		103,565
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	73,403		86,382
Impaired Financing Receivable Related Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0
Impaired Financing Receivable Related Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	220,756		189,947
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	25,897		26,977
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	30,231		63,740
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	56,128		90,717
Impaired Financing Receivable Related Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	11,288		11,883
Impaired Financing Receivable Related Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	36,681		35,831
Impaired Financing Receivable Related Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	1,246		1,410
Impaired Financing Receivable Related Allowance [Member] | Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0
Impaired Financing Receivable Related Allowance [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	4,674		5,254
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	53,889		54,378
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	313,381		293,686
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	34,260		43,257
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	102,672		83,179
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	1,027		1,056
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	137,959		127,492
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	12,565		16,500
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	116,700		96,351
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	129,265		112,851
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	14,491		14,798
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	30,356		37,096
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	1,310		1,449
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	46,157		53,343
Nonaccruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity			$1,022

Recovered_Sheet1

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 $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$2,424		$327	$74,500	$142,400
Recorded investment resulting from the following modification types	309,429					343,329
1-4 family residential	5,212,963					5,200,882
Construction and other consumer real estate	373,335					370,542
Commercial and industrial	13,264,092					13,162,955
Home equity credit line	2,314,806					2,321,150
Bankcard and other revolving plans	406,723					401,352
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	13,264,092					13,162,955
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	5,212,963					5,200,882
Construction and other consumer real estate	373,335					370,542
Home equity credit line	2,314,806					2,321,150
Bankcard and other revolving plans	406,723					401,352
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	44		0
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	986		0
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,030		0
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,284		0
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		84
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,284		84
Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		217
One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	110		0
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		26
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	110		243
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	28,532
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	51,041
Accruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	14,222
Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	44,424
Accruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	13,580
Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	45,340
Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	1,926
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	36,133
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	17,876
Nonaccruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	1,027					1,056
Nonaccruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	21,976
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	15,716
Nonaccruing [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	1,066
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	16,164
Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	406
Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	49,456					53,842
Interest Rate Below Market [Member] | Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	2,509
Interest Rate Below Market [Member] | Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	19,744
Interest Rate Below Market [Member] | Accruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0
Interest Rate Below Market [Member] | Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	7,238
Interest Rate Below Market [Member] | Accruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	741
Interest Rate Below Market [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	2,402
Interest Rate Below Market [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	284
Interest Rate Below Market [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0
Interest Rate Below Market [Member] | Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	322
Interest Rate Below Market [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	2,328
Interest Rate Below Market [Member] | Nonaccruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types						0
Interest Rate Below Market [Member] | Nonaccruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	10,901
Interest Rate Below Market [Member] | Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	2,780
Interest Rate Below Market [Member] | Nonaccruing [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	0
Interest Rate Below Market [Member] | Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	207
Interest Rate Below Market [Member] | Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	0
Maturity Or Term Extension [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	9,680					22,115
Maturity Or Term Extension [Member] | Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	3,462
Maturity Or Term Extension [Member] | Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	1,092
Maturity Or Term Extension [Member] | Accruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0
Maturity Or Term Extension [Member] | Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	1,019
Maturity Or Term Extension [Member] | Accruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	84
Maturity Or Term Extension [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	366
Maturity Or Term Extension [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	416
Maturity Or Term Extension [Member] | Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	515
Maturity Or Term Extension [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	1,163
Maturity Or Term Extension [Member] | Nonaccruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	1,027					1,056
Maturity Or Term Extension [Member] | Nonaccruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	66
Maturity Or Term Extension [Member] | Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0
Maturity Or Term Extension [Member] | Nonaccruing [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	0
Maturity Or Term Extension [Member] | Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	227
Maturity Or Term Extension [Member] | Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	243
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	23,009					21,718
Principal Forgiveness [Member] | Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	17
Principal Forgiveness [Member] | Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	952
Principal Forgiveness [Member] | Accruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0
Principal Forgiveness [Member] | Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	176
Principal Forgiveness [Member] | Accruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	10,968
Principal Forgiveness [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	7,073
Principal Forgiveness [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	0
Principal Forgiveness [Member] | Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	0
Principal Forgiveness [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0
Principal Forgiveness [Member] | Nonaccruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0					0
Principal Forgiveness [Member] | Nonaccruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0
Principal Forgiveness [Member] | Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	865
Principal Forgiveness [Member] | Nonaccruing [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	713
Principal Forgiveness [Member] | Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	2,245
Principal Forgiveness [Member] | Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	0
Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	9,990					10,124
Payment Deferral [Member] | Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	464
Payment Deferral [Member] | Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	1,241
Payment Deferral [Member] | Accruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0
Payment Deferral [Member] | Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	973
Payment Deferral [Member] | Accruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0
Payment Deferral [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	442
Payment Deferral [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	0
Payment Deferral [Member] | Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	3,310
Payment Deferral [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	833
Payment Deferral [Member] | Nonaccruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0					0
Payment Deferral [Member] | Nonaccruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	93
Payment Deferral [Member] | Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	2,170
Payment Deferral [Member] | Nonaccruing [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	203
Payment Deferral [Member] | Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	185
Payment Deferral [Member] | Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	76
Other Recorded Investment Resulting From Following Modification [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	31,666	[1]				33,956	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	151	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	10,845	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	510	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	2,289	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	164	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	1,381	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	0	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	6,951	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	2,525	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0					0
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	3,249	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	0	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	3,601	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	0	[1]
Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	185,628	[2]				201,574	[2]
Multiple Modification Types [Member] | Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	21,929	[2]
Multiple Modification Types [Member] | Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	17,167	[2]
Multiple Modification Types [Member] | Accruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	13,712	[2]
Multiple Modification Types [Member] | Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	32,729	[2]
Multiple Modification Types [Member] | Accruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	1,623	[2]
Multiple Modification Types [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	33,676	[2]
Multiple Modification Types [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	1,226	[2]
Multiple Modification Types [Member] | Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	25,035	[2]
Multiple Modification Types [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	11,027	[2]
Multiple Modification Types [Member] | Nonaccruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	0					0
Multiple Modification Types [Member] | Nonaccruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	7,667	[2]
Multiple Modification Types [Member] | Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	9,901	[2]
Multiple Modification Types [Member] | Nonaccruing [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	150	[2]
Multiple Modification Types [Member] | Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	9,699	[2]
Multiple Modification Types [Member] | Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	$87	[2]
[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.

Recovered_Sheet2

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 $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$2,424	$327	$74,500	$142,400
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,314,806				2,321,150
Net financial impact on interest income	594	639
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	169	124
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	146	204
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,314,806				2,321,150
Net financial impact on interest income	279	311
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	44	0
Net financial impact on interest income	-57	18
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	986	0
Net financial impact on interest income	-112	-142
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,030	0
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,284	0
Net financial impact on interest income	-37	-56
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	84
Net financial impact on interest income	-109	-148
Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	-1	-2
One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	110	0
Net financial impact on interest income	-271	-300
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	26
Net financial impact on interest income	-7	-9
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,284	84
Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	217
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	110	243
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2,314	327
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	44	0
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	986	0
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,030	0
Nonaccruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,284	0
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	84
Nonaccruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					1,022
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	26
Nonaccruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,284	84
Nonaccruing [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	217
Nonaccruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	243
Nonaccruing [Member] | Principal Forgiveness [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					420
Nonaccruing [Member] | Interest Rate Below Market [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					0
Nonaccruing [Member] | Maturity Or Term Extension [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					0
Nonaccruing [Member] | Payment Deferral [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					203
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					0	[1]
Nonaccruing [Member] | Multiple Modification Types [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					399	[2]
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	110	0
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Accruing [Member] | Owner Occupied [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	0	0
Accruing [Member] | Commercial Real Estate Construction Financing Receivable [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] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	110	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 Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Accruing [Member] | Home Equity Line of Credit [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	$110	$0
[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.

Recovered_Sheet3

Loans And Allowance For Credit Losses (Schedule Of Investment Of Accruing And Nonaccruing Loans Modified As Troubled Debt Restructurings) (Details) (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$2,424		$327	$74,500	$142,400
Loans Receivable, Gross, Commercial and Industrial	13,264,092					13,162,955
Financing Receivable, Modifications, Recorded Investment	309,429					343,329
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,314,806					2,321,150
Loans and Leases Receivable, Gross, Consumer, Mortgage	5,212,963					5,200,882
Loans and Leases Receivable, Gross, Consumer, Construction	373,335					370,542
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	406,723					401,352
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	110		0
Financing Receivable, Modifications, Recorded Investment	199,065					245,550
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2,314		327
Financing Receivable, Modifications, Recorded Investment	110,364					97,779
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	13,264,092					13,162,955
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,314,806					2,321,150
Loans and Leases Receivable, Gross, Consumer, Mortgage	5,212,963					5,200,882
Loans and Leases Receivable, Gross, Consumer, Construction	373,335					370,542
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	406,723					401,352
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	44		0
Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Loans Receivable, Gross, Commercial and Industrial						50,781
Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	44		0
Loans Receivable, Gross, Commercial and Industrial						27,238
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	986		0
Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Financing Receivable, Modifications, Recorded Investment						51,781
Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	986		0
Financing Receivable, Modifications, Recorded Investment						19,708
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,030		0
Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Financing Receivable, Modifications, Recorded Investment	79,573					102,562
Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,030		0
Financing Receivable, Modifications, Recorded Investment	55,036					48,002
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,284		0
Commercial Real Estate Construction Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Financing Receivable, Modifications, Recorded Investment						20,375
Commercial Real Estate Construction Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,284		0
Financing Receivable, Modifications, Recorded Investment						20,968
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		84
Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Financing Receivable, Modifications, Recorded Investment						61,240
Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		84
Financing Receivable, Modifications, Recorded Investment						7,735
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,284		84
Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Financing Receivable, Modifications, Recorded Investment	58,646					81,615
Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,284		84
Financing Receivable, Modifications, Recorded Investment	37,692					28,703
Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		217
Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Financing Receivable, Modifications, Recorded Investment						13,579
Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		217
One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	110		0
One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	110		0
Loans and Leases Receivable, Gross, Consumer, Mortgage						45,723
One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Loans and Leases Receivable, Gross, Consumer, Mortgage						19,489
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		26
Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Loans and Leases Receivable, Gross, Consumer, Construction						2,071
Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		26
Loans and Leases Receivable, Gross, Consumer, Construction						563
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	110		243
Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	110		0
Financing Receivable, Modifications, Recorded Investment	60,846					61,373
Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		243
Financing Receivable, Modifications, Recorded Investment	17,636					21,074
Maturity Or Term Extension [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,680					22,115
Maturity Or Term Extension [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,439					17,704
Maturity Or Term Extension [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,241					4,411
Maturity Or Term Extension [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						6,509
Maturity Or Term Extension [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						576
Maturity Or Term Extension [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						1,124
Maturity Or Term Extension [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						1,219
Maturity Or Term Extension [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	4,554					7,633
Maturity Or Term Extension [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,705					2,851
Maturity Or Term Extension [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						0
Maturity Or Term Extension [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						68
Maturity Or Term Extension [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						9,027
Maturity Or Term Extension [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						0
Maturity Or Term Extension [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,019					9,027
Maturity Or Term Extension [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	66					68
Maturity Or Term Extension [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						70
Maturity Or Term Extension [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						552
Maturity Or Term Extension [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						1,029
Maturity Or Term Extension [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						422
Maturity Or Term Extension [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						463
Maturity Or Term Extension [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	866					1,044
Maturity Or Term Extension [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	470					1,492
Other Recorded Investment Resulting From Following Modification [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	31,666	[1]				33,956	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	15,340	[1]				18,801	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	16,326	[1]				15,155	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						3,855	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						5,199	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						10,960	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						2,852	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,996	[1]				14,815	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,476	[1]				8,051	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						521	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						3,300	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						2,546	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						277	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,799	[1]				3,067	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,249	[1]				3,577	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						166	[1]
Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						753	[1]
Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						3,527	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						0	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						0	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,545	[1]				919	[1]
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,601	[1]				3,527	[1]
Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	185,628	[2]				201,574	[2]
Multiple Modification Types [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	122,062	[2]				148,178	[2]
Multiple Modification Types [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	63,566	[2]				53,396	[2]
Multiple Modification Types [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						34,585	[2]
Multiple Modification Types [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						20,410	[2]
Multiple Modification Types [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						17,505	[2]
Multiple Modification Types [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						12,040	[2]
Multiple Modification Types [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	39,096	[2]				52,090	[2]
Multiple Modification Types [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	36,062	[2]				32,450	[2]
Multiple Modification Types [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						19,854	[2]
Multiple Modification Types [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						6,427	[2]
Multiple Modification Types [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						39,007	[2]
Multiple Modification Types [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						4,607	[2]
Multiple Modification Types [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	46,441	[2]				58,861	[2]
Multiple Modification Types [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	17,568	[2]				11,034	[2]
Multiple Modification Types [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						1,281	[2]
Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						34,719	[2]
Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						9,413	[2]
Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						1,227	[2]
Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						100	[2]
Multiple Modification Types [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	36,525	[2]				37,227	[2]
Multiple Modification Types [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,936	[2]				9,912	[2]
Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	49,456					53,842
Interest Rate Below Market [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	32,918					33,377
Interest Rate Below Market [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	16,538					20,465
Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						2,611
Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						442
Interest Rate Below Market [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						19,981
Interest Rate Below Market [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						2,714
Interest Rate Below Market [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	22,253					22,592
Interest Rate Below Market [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,650					3,156
Interest Rate Below Market [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						0
Interest Rate Below Market [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						11,080
Interest Rate Below Market [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						7,328
Interest Rate Below Market [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						2,851
Interest Rate Below Market [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,238					7,328
Interest Rate Below Market [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	13,681					13,931
Interest Rate Below Market [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						742
Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						2,425
Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						3,378
Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						290
Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						0
Interest Rate Below Market [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,427					3,457
Interest Rate Below Market [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	207					3,378
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	23,009					21,718
Principal Forgiveness [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	19,186					19,347
Principal Forgiveness [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,823					2,371
Principal Forgiveness [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						18
Principal Forgiveness [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						0
Principal Forgiveness [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						960
Principal Forgiveness [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						0
Principal Forgiveness [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	969					978
Principal Forgiveness [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0					0
Principal Forgiveness [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						0
Principal Forgiveness [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						0
Principal Forgiveness [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						179
Principal Forgiveness [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						0
Principal Forgiveness [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	176					179
Principal Forgiveness [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	865					0
Principal Forgiveness [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						11,320
Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						6,828
Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						1,951
Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						42
Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						0
Principal Forgiveness [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	18,041					18,190
Principal Forgiveness [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,958					2,371
Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,990					10,124
Payment Deferral [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,120					8,143
Payment Deferral [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,870					1,981
Payment Deferral [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						3,203
Payment Deferral [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial						611
Payment Deferral [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						1,251
Payment Deferral [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						883
Payment Deferral [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,705					4,454
Payment Deferral [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	4,143					1,494
Payment Deferral [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						0
Payment Deferral [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						93
Payment Deferral [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						3,153
Payment Deferral [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						0
Payment Deferral [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	973					3,153
Payment Deferral [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,263					93
Payment Deferral [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						0
Payment Deferral [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						446
Payment Deferral [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage						191
Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						90
Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction						0
Payment Deferral [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	442					536
Payment Deferral [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	464					394
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	36,133
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	17,876
Nonaccruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,027					1,056
Nonaccruing [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	21,976
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	15,716
Nonaccruing [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	1,066
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	16,164
Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	406
Nonaccruing [Member] | Maturity Or Term Extension [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	515
Nonaccruing [Member] | Maturity Or Term Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,163
Nonaccruing [Member] | Maturity Or Term Extension [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,027					1,056
Nonaccruing [Member] | Maturity Or Term Extension [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	66
Nonaccruing [Member] | Maturity Or Term Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0
Nonaccruing [Member] | Maturity Or Term Extension [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	0
Nonaccruing [Member] | Maturity Or Term Extension [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	227
Nonaccruing [Member] | Maturity Or Term Extension [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	243
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	6,951	[1]
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,525	[1]
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0					0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,249	[1]
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	[1]
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	0	[1]
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	3,601	[1]
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	0	[1]
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	25,035	[2]
Nonaccruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	11,027	[2]
Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0					0
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,667	[2]
Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,901	[2]
Nonaccruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	150	[2]
Nonaccruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	9,699	[2]
Nonaccruing [Member] | Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	87	[2]
Nonaccruing [Member] | Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	322
Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,328
Nonaccruing [Member] | Interest Rate Below Market [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment						0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,901
Nonaccruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,780
Nonaccruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	0
Nonaccruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	207
Nonaccruing [Member] | Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	0
Nonaccruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0
Nonaccruing [Member] | Principal Forgiveness [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0					0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0
Nonaccruing [Member] | Principal Forgiveness [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	865
Nonaccruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	713
Nonaccruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	2,245
Nonaccruing [Member] | Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	0
Nonaccruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	3,310
Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	833
Nonaccruing [Member] | Payment Deferral [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0					0
Nonaccruing [Member] | Payment Deferral [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	93
Nonaccruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,170
Nonaccruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	203
Nonaccruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	185
Nonaccruing [Member] | Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	$76
[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.

Recovered_Sheet4

Loans And Allowance For Credit Losses (Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Loans And Allowance For Credit Losses [Abstract]
Commercial	$96,157	$104,942
Commercial real estate	105,234	118,217
Consumer	17,129	17,910
Outstanding balance	218,520	241,069
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	162,890	179,299
ALLL	1,438	2,800
Carrying amount, net	$161,452	$176,499

Recovered_Sheet5

Loans And Allowance For Credit Losses (Schedule Of Changes In The Accretable Yield For PCI Loans) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Loans And Allowance For Credit Losses [Abstract]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	$9,583	$22,307
Changes in Accretable Yield [Roll Forward]
Balance at beginning of period	45,055	77,528
Disposals and other	2,178	1,624
Balance at end of period	50,931	65,765
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	$13,281	$8,920

Derivative_Instruments_And_Hed2

Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Derivative [Line Items]
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value	$0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	1,016,000		351,000
Fair values of derivative assets reduced (increased) by net credit valuation adjustments	3,300,000		1,600,000
Fair values of derivative liabilities reduced (increased) by net credit valuation adjustments	100,000		1,200,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Future Expected	3,400,000
Total derivatives, Notional amount	3,704,468,000				3,488,773,000
Cash collateral pledged for derivative liabilities	65,800,000
Additional collateral that would be required to be pledge if credit rating was downgraded by one notch	1,800,000
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	1,016,000		351,000
Total derivatives, Notional amount	300,000,000				275,000,000
Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	1,016,000	[1]	351,000	[1]
Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	81,123,000				66,064,000
Other Liabilities [Member] | Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	0				123,000
Other Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Gross amounts recognized	$81,123,000				$66,064,000
[1]	Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain.

Derivative_Instruments_And_Hed3

Derivative Instruments And Hedging Activities (Schedule Of Notional Amounts And Recorded Gross Fair Values And Related Gain (Loss) Of Derivative Instruments) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Derivative [Line Items]
Total derivatives, Notional amount	$3,704,468				$3,488,773
Amount of derivative gain (loss), recognized in OCI	4,253		538
Amount of derivative gain (loss), Reclassified from AOCI to interest income	1,016		351
Derivatives instruments, Noninterest income (expense)	3,253		-6,259
Derivatives designated as hedging instruments, Offset to interest expense	468		718
Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives instruments, Noninterest income (expense)	0	[1]
Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	83,978				66,420
Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	81,123				66,064
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount	300,000				275,000
Amount of derivative gain (loss), recognized in OCI	4,253		538
Amount of derivative gain (loss), Reclassified from AOCI to interest income	1,016		351
Derivatives instruments, Noninterest income (expense)	0
Derivatives designated as hedging instruments, Offset to interest expense	468		718
Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Amount of derivative gain (loss), recognized in OCI	4,253	[1]	538	[1]
Amount of derivative gain (loss), Reclassified from AOCI to interest income	1,016	[1]	351	[1]
Derivatives Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	4,623				1,508
Derivatives Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	0				123
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Total derivatives, Notional amount	300,000	[1]			275,000	[1]
Amount of derivative gain (loss), recognized in OCI	4,253	[1]	538
Amount of derivative gain (loss), Reclassified from AOCI to interest income	1,016	[1]	351
Derivatives instruments, Noninterest income (expense)	0	[1]
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	4,623	[1]			1,508	[1]
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	0	[1]			123	[1]
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	468		718
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount	3,404,468				3,213,773
Derivatives instruments, Noninterest income (expense)	3,253		-6,259
Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	79,355				64,912
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	81,123				65,941
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Total derivatives, Notional amount	355,708				443,721
Derivatives instruments, Noninterest income (expense)	2,735		1,711
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	20,373				16,625
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	18,671				15,272
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivatives instruments, Noninterest income (expense)	0		6
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Total derivatives, Notional amount	3,048,760	[2]			2,770,052	[2]
Derivatives instruments, Noninterest income (expense)	517	[2]	-549
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	58,982	[2]			48,287	[2]
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	62,452	[2]			50,669	[2]
Derivatives Not Designated As Hedging Instruments [Member] | Total Return Swap [Member]
Derivative [Line Items]
Derivatives instruments, Noninterest income (expense)	$0		($7,427)
[1]	Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain.
[2]	Amounts include both the customer swaps and the offsetting derivative contracts.

Debt_And_Shareholders_Equity_N

Debt And Shareholders' Equity (Narrative) (Details) (USD $)	3 Months Ended						0 Months Ended
	Mar. 31, 2015					Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014	Feb. 17, 2015
Debt And Shareholders' Equity [Line Items]
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt is summarized as follows:
	(In thousands)	March 31, 2015		December 31, 2014
	Junior subordinated debentures related to trust preferred securities	$	168,043	$	168,043
	Convertible subordinated notes	138,002		132,838
	Subordinated notes	335,341		335,798
	Senior notes	424,901		432,385
	FHLB advances	22,009		22,156
	Capital lease obligations and other	1,025		1,062
	Total	$	1,089,321	$	1,092,282
Junior Subordinated Notes	$168,043,000						$168,043,000	$168,043,000
Convertible Subordinated Debt	138,002,000						138,002,000	132,838,000
Subordinated Debt	335,341,000						335,341,000	335,798,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	13,613,000					71,386,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	-481,000					-24,747,000
Subordinated Debt, Current	223,453,000						223,453,000
Senior Notes	424,901,000						424,901,000	432,385,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	22,009,000						22,009,000	22,156,000
Capital Lease Obligations	1,025,000						1,025,000	1,062,000
Long-term Debt, Gross	1,089,321,000						1,089,321,000	1,092,282,000
Medium-term Notes	30,300,000						30,300,000
Convertible Subordinated Note, Coupon Rate 6.00% [Member]
Debt And Shareholders' Equity [Line Items]
Subordinated Borrowing, Interest Rate							0.00%
Convertible Subordinated Debt, Current	73,397,000						73,397,000
Debt Instrument, Maturity Date	15-Sep-15
Subordinated Notes, Coupon Rate 6.00% [Member]
Debt And Shareholders' Equity [Line Items]
Subordinated Borrowing, Interest Rate							0.00%
Subordinated Debt, Current	32,706,000						32,706,000
Debt Instrument, Maturity Date	15-Sep-15
Convertible Subordinated Notes, Coupn Rate 5.50% [Member]
Debt And Shareholders' Equity [Line Items]
Subordinated Borrowing, Interest Rate							0.00%
Convertible Subordinated Debt, Current	64,606,000						64,606,000
Debt Instrument, Maturity Date	16-Nov-15
Subordinated Notes, Coupon Rate 5.50% [Member] [Member]
Debt And Shareholders' Equity [Line Items]
Subordinated Borrowing, Interest Rate							0.00%
Subordinated Debt, Current	52,744,000						52,744,000
Debt Instrument, Maturity Date	16-Nov-15
Senior medium-term notes, optional early redemptions in 2015 [Member]
Debt And Shareholders' Equity [Line Items]
Senior medium-term notes with early redemption option	19,228,000						19,228,000		8,000,000
Senior medium-term notes, optional early redemptions in 2016 [Member]
Debt And Shareholders' Equity [Line Items]
Senior medium-term notes with early redemption option	$11,106,000						$11,106,000

Debt_And_Shareholders_Equity_S2

Debt And Shareholders' Equity (Schedule Of Changes In Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$6,957	$40,396
Interest income expense, net, after tax	75,279	76,190
Income Tax Expense (Benefit)	51,176	56,121
Interest Income (Expense), Net	417,346	416,471
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	0	27
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	13,613	71,386
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	-481	-24,747
Beginning balance	-128,041	-192,101
Other comprehensive income (loss)	13,132	46,639
Ending balance	-114,909	-145,462
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	1,088	-1,683
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	0	0
Other Comprehensive Income (Loss), Tax	8,045	38,713
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	11,424	73,907
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	148	-24,537
Beginning balance	-91,921	-168,805
Other comprehensive income (loss)	11,572	49,370
Ending balance	-80,349	-119,435
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	2,189	-2,521
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	-629	-210
Beginning balance	2,226	1,556
Other comprehensive income (loss)	1,560	-2,731
Ending balance	3,786	-1,175
Accumulated Defined Benefit Plans Adjustment [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Beginning balance	-38,346	-24,852
Other comprehensive income (loss)	0	0
Ending balance	-38,346	-24,852
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Debt And Shareholders' Equity [Line Items]
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	-239	30,914
Interest income expense, net, after tax	0	-17
Income Tax Expense (Benefit)	0	-10
Other than temporary impairment losses investments accretion of noncreidt portion held to maturity securities, after tax	-148	24,537
Other than temporary impairment losses investments accretion of noncredit portion held to maturity securities, tax	0	196
Other than Temporary Impairment Losses, Investments, Accretion of Noncredit Portion, Held-to-maturity Securities, before Tax	0	-482
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	0	-27
Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Debt And Shareholders' Equity [Line Items]
Interest income expense, net, after tax	629	210
Income Tax Expense (Benefit)	387	141
Interest Income (Expense), Net	1,016	351
Fixed income securities gain loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Debt And Shareholders' Equity [Line Items]
Interest income expense, net, after tax	-148	24,840
Income Tax Expense (Benefit)	($91)	$6,074

Debt_And_Shareholders_Equity_S3

Debt And Shareholders' Equity Schedule of Long-Term Debt Instruments (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Junior Subordinated Notes	$168,043	$168,043
Convertible Subordinated Debt	138,002	132,838
Subordinated Debt	335,341	335,798
Senior Notes	424,901	432,385
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	22,009	22,156
Capital Lease Obligations	1,025	1,062
Long-term Debt, Gross	$1,089,321	$1,092,282

Debt_And_Shareholders_Equity_S4

Debt And Shareholders' Equity Schedule of Subordinated Borrowing (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Long-term Debt, Unclassified [Abstract]
Subordinated Debt, Current	$223,453
Convertible Subordinated Note, Coupon Rate 6.00% [Member]
Long-term Debt, Unclassified [Abstract]
Subordinated Borrowing, Interest Rate	0.00%
Convertible Subordinated Debt, Current	73,397
Subordinated Notes, Coupon Rate 6.00% [Member]
Long-term Debt, Unclassified [Abstract]
Subordinated Borrowing, Interest Rate	0.00%
Subordinated Debt, Current	32,706
Convertible Subordinated Notes, Coupn Rate 5.50% [Member]
Long-term Debt, Unclassified [Abstract]
Subordinated Borrowing, Interest Rate	0.00%
Convertible Subordinated Debt, Current	64,606
Subordinated Notes, Coupon Rate 5.50% [Member] [Member]
Long-term Debt, Unclassified [Abstract]
Subordinated Borrowing, Interest Rate	0.00%
Subordinated Debt, Current	$52,744

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	38.25%
Net deferred tax assets	$213	$224

Fair_Value_Narrative_Details

Fair Value (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Fair Value Level Transfers Among Levels 1, 2, and 3	0	0
Other noninterest-bearing investments valued under the cost method	$33,300,000		39,100,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	250,500,000		250,700,000
Net gains on sale of OREO properties	-374,000	-1,607,000
Principal amount of other real estate owned property sold	4,100,000	10,000,000
OREO Properties [Member]
Derivatives, Fair Value [Line Items]
Net gains on sale of OREO properties	700,000	1,000,000
Impairment of OREO properties		-200,000
Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	3,880,430,000		3,336,943,000
Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	445,629,000		401,957,000
Third Party Pricing Service [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0
Third Party Pricing Service [Member] | Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	$0
Trust Preferred Predominantly Banks [Member] | Minimum [Member]
Derivatives, Fair Value [Line Items]
Significant Unobservable Inputs, Loss Given Deferral Rate	11.90%		14.50%
Discount Rate Range Of Libor Utilized For Fair Value Purposes	3.70%		3.40%
Trust Preferred Predominantly Banks [Member] | Maximum [Member]
Derivatives, Fair Value [Line Items]
Significant Unobservable Inputs, Loss Given Deferral Rate	100.00%		100.00%
Discount Rate Range Of Libor Utilized For Fair Value Purposes	5.40%		5.60%
Constant Prepayment Rate Until Maturity [Member] | Trust Preferred Predominantly Banks [Member]
Derivatives, Fair Value [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	2.00%		2.00%

Fair_Value_Schedule_Of_Assets_

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Level Transfers Among Levels 1, 2, and 3	0	0
Trading account	$71,392		$70,601
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	124,443		105,348
Total assets	236,184		210,851
Securities sold, not yet purchased	6,749		24,230
Total liabilities	116,788		128,380
Level 1 [Member] | Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	91,368		88,878
Other liabilities	91,368		88,878
Level 1 [Member] | Mutual Funds And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	124,443		105,348
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]
Investments, Fair Value Disclosure	0		0
Level 1 [Member] | Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	20,373		16,625
Other liabilities	18,671		15,272
Level 1 [Member] | Derivatives [Member] | Foreign Currency Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	20,373		16,625
Other liabilities	18,671		15,272
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	3,880,430		3,336,943
Trading account	71,392		70,601
Total assets	4,495,138		3,933,629
Securities sold, not yet purchased	0
Total liabilities	62,628		50,966
Level 2 [Member] | Mutual Funds And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	28,247		30,275
Level 2 [Member] | Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	478,926		476,290
Level 2 [Member] | Private Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments
Level 2 [Member] | Available-for-sale Securities [Member] | U.S. Treasury, Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	3,655,221		3,098,208
Level 2 [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	173,145		185,093
Level 2 [Member] | Asset-Backed Securities [Member] | Banks, Trust and Insurance, Equities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	23,179		22,701
Level 2 [Member] | Asset-Backed Securities [Member] | Other (Including ABS CDOs) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure			666
Level 2 [Member] | Asset-Backed Securities [Member] | Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	638
Level 2 [Member] | Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	64,390		49,795
Other liabilities	62,628		50,966
Level 2 [Member] | Derivatives [Member] | Interest Rate Related And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	5,408		1,508
Other liabilities	176		297
Level 2 [Member] | Derivatives [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	58,982		48,287
Other liabilities	62,452		50,669
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	445,629		401,957
Total assets	565,078		514,049
Other liabilities			13
Total liabilities	0		13
Level 3 [Member] | Private Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	107,448		99,865
Level 3 [Member] | Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	12,001		12,227
Level 3 [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	2,465		4,164
Level 3 [Member] | Asset-Backed Securities [Member] | Banks, Trust and Insurance, Equities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	438,338		393,007
Level 3 [Member] | Asset-Backed Securities [Member] | Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure			4,761
Level 3 [Member] | Asset-Backed Securities [Member] | Other (Including ABS CDOs) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure			25
Level 3 [Member] | Asset-Backed Securities [Member] | Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	4,826
Level 3 [Member] | Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	0		0
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	4,450,502		3,844,248
Trading account	71,392		70,601
Total assets	5,296,400		4,658,529
Securities sold, not yet purchased	6,749		24,230
Other liabilities	0		13
Total liabilities	179,416		179,359
Estimated Fair Value [Member] | Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	91,368		88,878
Other liabilities	91,368		88,878
Estimated Fair Value [Member] | Mutual Funds And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	152,690		135,623
Estimated Fair Value [Member] | Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	478,926		476,290
Estimated Fair Value [Member] | Private Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other noninterest-bearing investments	107,448		99,865
Estimated Fair Value [Member] | Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	12,001		12,227
Estimated Fair Value [Member] | Available-for-sale Securities [Member] | U.S. Treasury, Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	3,655,221		3,098,208
Estimated Fair Value [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	175,610		189,257
Estimated Fair Value [Member] | Asset-Backed Securities [Member] | Banks, Trust and Insurance, Equities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	461,517		415,708
Estimated Fair Value [Member] | Asset-Backed Securities [Member] | Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure			4,761
Estimated Fair Value [Member] | Asset-Backed Securities [Member] | Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	5,464		691
Estimated Fair Value [Member] | Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	84,763		66,420
Other liabilities	81,299		66,238
Estimated Fair Value [Member] | Derivatives [Member] | Interest Rate Related And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	5,408		1,508
Other liabilities	176		297
Estimated Fair Value [Member] | Derivatives [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	58,982		48,287
Other liabilities	62,452		50,669
Estimated Fair Value [Member] | Derivatives [Member] | Foreign Currency Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	20,373		16,625
Other liabilities	$18,671		$15,272

Fair_Value_Schedule_Of_Key_Mod

Fair Value (Schedule Of Key Model Inputs And Assumptions Used To Fair Value Certain Asset-Backed Securities) (Details) (Trust Preferred Predominantly Banks [Member])	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Asset-Backed Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Asset-backed securities, Loss severity	100.00%	100.00%
Constant Default Rate Year 1 [Member] | Minimum [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Asset-backed securities, Constant default rate	0.30%	0.30%
Constant Default Rate Year 1 [Member] | Maximum [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Asset-backed securities, Constant default rate	0.50%	0.80%
Constant Default Rate Year 2 to 5 [Member] | Minimum [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Asset-backed securities, Constant default rate	0.50%	0.50%
Constant Default Rate Year 2 to 5 [Member] | Maximum [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Asset-backed securities, Constant default rate	0.70%	0.90%
Constant Default Rate Year 6 to Maturity [Member] | Minimum [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Asset-backed securities, Constant default rate	0.60%	0.60%
Constant Default Rate Year 6 to Maturity [Member] | Maximum [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Asset-backed securities, Constant default rate	0.70%	0.70%
Constant Default Rate Until 2016 [Member] | Minimum [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed
Constant Default Rate Until 2016 [Member] | Maximum [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed

Fair_Value_Schedule_Of_Assets_1

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total net gains (losses) included in, Other noninterest expense	$58,431	$72,673
Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	4,164	10,662
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	2	10
Total net gains (losses) included in, Fixed income securities gains (losses), net	31	16
Total net gains (losses) included in, Other comprehensive income (loss)	127	-274
Total net gains (losses) included in, Sales
Total net gains (losses) included in, Redemptions and paydowns	-1,859	-230
Fair value of assets, Ending balance	2,465	10,184
Banks, Trust and Insurance, Equities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	393,007	1,238,820
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	257	720
Total net gains (losses) included in, Fixed income securities gains (losses), net	-323	18,582
Total net gains (losses) included in, Other comprehensive income (loss)	-6,949	94,462
Fair Value of Securities Reclassified from HTM to AFS	57,308
Total net gains (losses) included in, Sales	2,613	546,388
Total net gains (losses) included in, Redemptions and paydowns	-2,349	-46,786
Fair value of assets, Ending balance	438,338	690,217
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		69,193
Trust Preferred Securities - Real Estate Investment Trusts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	0	22,996
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale
Total net gains (losses) included in, Fixed income securities gains (losses), net		1,399
Total net gains (losses) included in, Other comprehensive income (loss)
Total net gains (losses) included in, Sales		24,395
Fair value of assets, Ending balance	0	0
Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance		6,599
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale		1
Total net gains (losses) included in, Fixed income securities gains (losses), net
Total net gains (losses) included in, Other comprehensive income (loss)		-40
Total net gains (losses) included in, Redemptions and paydowns
Fair value of assets, Ending balance		6,560
Other Asset-Backed [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	4,786	25,800
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale
Total net gains (losses) included in, Fixed income securities gains (losses), net		10,917
Total net gains (losses) included in, Other comprehensive income (loss)	42	-15
Total net gains (losses) included in, Sales		36,669
Total net gains (losses) included in, Redemptions and paydowns	-2	-3
Fair value of assets, Ending balance	4,826	30
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	99,865	82,410
Total net gains (losses) included in, Dividends and other investment income	1,074	-1,695
Total net gains (losses) included in, Equity securities gains, net	3,253
Total net gains (losses) included in, Purchases	5,052	1,356
Total net gains (losses) included in, Sales	-1,517	-824
Total net gains (losses) included in, Redemptions and paydowns	-279	-195
Fair value of assets, Ending balance	107,448	81,052
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	12,227	8,852
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	4	481
Total net gains (losses) included in, Purchases	171	2,077
Total net gains (losses) included in, Redemptions and paydowns	-401	-203
Fair value of liabilities, Ending balance	12,001	11,207
Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	-13	-4,303
Derivative, Gain (Loss) on Derivative, Net		-7,427
Total net gains (losses) included in, Other noninterest expense	13	8
Total net gains (losses) included, in Redemptions and paydowns, Liabilities		-6,090
Fair value of liabilities, Ending balance	$0	($5,632)

Fair_Value_Schedule_Of_Realize

Fair Value (Schedule Of Realized Gains (Losses) Using Level 3 Inputs) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Dividends and Other Investment Income (Loss) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Realized gains (losses) from Level 3 inputs	$0	$34
Fixed Income Securities Gains (Losses), Net [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Realized gains (losses) from Level 3 inputs	-292	30,914
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Assets Measured On Recurring Basis And Gain Loss Included In Fixed Income Securities Gains (Losses), Net	31	16
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Accretion Of Purchase Discount On Securities Available-For-Sale	2	10
Trust Preferred Securities Real Estate Investment Trusts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Assets Measured On Recurring Basis And Gain Loss Included In Fixed Income Securities Gains (Losses), Net		1,399
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Accretion Of Purchase Discount On Securities Available-For-Sale

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 $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Minimum [Member] | Trust Preferred Predominantly Banks [Member] | Constant Default Rate Until 2016 [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed
Minimum [Member] | Trust Preferred Predominantly Banks [Member] | Constant Default Rate Year 1 [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Assumption For Fair Value Of Assets Or Liabilities Constant Default Rate	0.30%	0.30%
Minimum [Member] | Trust Preferred Predominantly Banks [Member] | Constant Default Rate Year 2 to 5 [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Assumption For Fair Value Of Assets Or Liabilities Constant Default Rate	0.50%	0.50%
Minimum [Member] | Trust Preferred Predominantly Banks [Member] | Constant Default Rate Year 6 to Maturity [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Assumption For Fair Value Of Assets Or Liabilities Constant Default Rate	0.60%	0.60%
Maximum [Member] | Trust Preferred Predominantly Banks [Member] | Constant Default Rate Until 2016 [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed
Maximum [Member] | Trust Preferred Predominantly Banks [Member] | Constant Default Rate Year 1 [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Assumption For Fair Value Of Assets Or Liabilities Constant Default Rate	0.50%	0.80%
Maximum [Member] | Trust Preferred Predominantly Banks [Member] | Constant Default Rate Year 2 to 5 [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Assumption For Fair Value Of Assets Or Liabilities Constant Default Rate	0.70%	0.90%
Maximum [Member] | Trust Preferred Predominantly Banks [Member] | Constant Default Rate Year 6 to Maturity [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Assumption For Fair Value Of Assets Or Liabilities Constant Default Rate	0.70%	0.70%
Asset-Backed Securities [Member] | Trust Preferred Predominantly Banks [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Static Pool Losses	100.00%	100.00%
Level 3 [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Investments, Fair Value Disclosure	445,629	401,957
Level 3 [Member] | Trust Preferred Predominantly Banks [Member] | Asset-Backed Securities [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Investments, Fair Value Disclosure	438,338	393,007
Level 3 [Member] | Other Credit Derivatives [Member] | Asset-Backed Securities [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Investments, Fair Value Disclosure	4,826

Fair_Value_Schedule_Of_Assets_2

Fair Value (Schedule Of Assets With Fair Value Changes On Nonrecurring Basis) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount of other real estate owned property sold	$4,100,000	$10,000,000
Gains (losses) from fair value changes	-6,648,000	-4,438,000
HTM Securities Adjusted For OTTI [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	0	-27,000
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	-4,487,000	-2,177,000
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	-1,153,000	0
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	-1,008,000	-2,234,000
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0
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 [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 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	12,679,000		28,528,000
Level 2 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	9,793,000		20,494,000
Level 2 [Member] | Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0
Level 2 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	2,886,000		8,034,000
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	1,997,000		23,454,000
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
Level 3 [Member] | Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	1,997,000		23,454,000
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
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	14,676,000		51,982,000
Estimated Fair Value [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	9,793,000		20,494,000
Estimated Fair Value [Member] | Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	1,997,000		23,454,000
Estimated Fair Value [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	$2,886,000		$8,034,000

Fair_Value_Schedule_Of_Carryin

Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	$602,355	$677,196
Time deposits	2,344,818	2,406,924
Long-term debt (less fair value hedges)	1,089,321	1,092,282
Carrying Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	590,950	647,252
Loans and leases (including loans held for sale), net of allowance	39,689,047	39,591,499
Time deposits	2,344,818	2,406,924
Foreign deposits	382,985	328,391
Long-term debt (less fair value hedges)	1,088,285	1,090,778
Estimated Fair Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	602,355	677,196
Loans and leases (including loans held for sale), net of allowance	39,573,365	39,426,498
Time deposits	2,349,454	2,408,550
Foreign deposits	382,873	328,447
Long-term debt (less fair value hedges)	$1,149,869	$1,159,287

Commitments_Guarantees_And_Con2

Commitments, Guarantees, And Contingent Liabilities (Narrative) (Details) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Guarantees, Commitments And Contingencies [Abstract]
Letters of credit, accrued liability	$15
Reserve for unfunded lending commitments	12
Deferred commitment fees	3
Guarantee of trust preferred securities issued by affiliated trusts	15
Commitments for Private Equity and Other Noninterest-bearing Investments	34.9
Range of possible loss, minimum	0
Range of possible loss, maximum	$50

Commitments_Guarantees_And_Con3

Commitments, Guarantees, And Contingent Liabilities (Schedule Of Guarantees Issued) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Commitments To Extend Credit	$16,528,689	$16,658,757
Commercial Letters Of Credit	68,807	32,144
Total Unfunded Lending Commitments	17,543,102	17,620,278
Financial [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	753,853	745,895
Performance [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	$191,753	$183,482

Retirement_Plans_Schedule_Of_N

Retirement Plans (Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$0	$0
Interest cost	1,783	1,880
Expected return on plan assets	-3,090	-3,326
Amortization of net actuarial (gain) loss	1,574	797
Net periodic benefit cost (credit)	267	-649
Supplemental Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	101	113
Amortization of prior service cost (credit)		13
Amortization of net actuarial (gain) loss	31	5
Net periodic benefit cost (credit)	132	131
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	8
Interest cost	10	12
Amortization of prior service cost (credit)
Amortization of net actuarial (gain) loss	-13	-18
Net periodic benefit cost (credit)	$5	$2

Operating_Segment_Information_1

Operating Segment Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
	Banks
Segment Reporting Information [Line Items]
Net interest income	$417,346,000	$416,471,000
Provision for loan losses	-1,494,000	-610,000
Net interest income after provision for loan losses	418,840,000	417,081,000
Other noninterest income	922,000	2,524,000
Noninterest expense	397,461,000	398,063,000
Income before income taxes	143,201,000	157,331,000
Income Tax Expense (Benefit)	51,176,000	56,121,000
Net income	92,025,000	101,210,000
Number of community/regional banks operating in distinct geographical areas	8
Zions Bank [Member]
Segment Reporting Information [Line Items]
Net interest income	141,100,000	142,500,000
Provision for loan losses	-4,600,000	-8,700,000
Net interest income after provision for loan losses	145,700,000	151,200,000
Other noninterest income	46,800,000	44,000,000
Noninterest expense	127,400,000	121,500,000
Income before income taxes	65,100,000	73,700,000
Income Tax Expense (Benefit)	23,400,000	26,800,000
Net income	41,700,000	46,900,000
Net Income (Loss) Attributable to Noncontrolling Interest	500,000	0
Net income (loss) applicable to controlling interest	41,200,000	46,900,000
Total assets	18,573,000,000	18,275,000,000
Average cash and due from banks	297,000,000	339,000,000
Average money market investments	2,968,000,000	3,546,000,000
Average Securities	2,468,000,000	1,596,000,000
Total loans	12,180,000,000	12,247,000,000
Total deposits	16,160,000,000	15,980,000,000
Preferred equity	280,000,000	280,000,000
Common equity	1,633,000,000	1,538,000,000
Noncontrolling interests	11,000,000	0
Total shareholders' equity	1,924,000,000	1,818,000,000
CB&T [Member]
Segment Reporting Information [Line Items]
Net interest income	96,700,000	94,700,000
Provision for loan losses	11,100,000	16,900,000
Net interest income after provision for loan losses	85,600,000	77,800,000
Other noninterest income	34,000,000	32,000,000
Noninterest expense	94,000,000	87,000,000
Income before income taxes	25,600,000	22,800,000
Income Tax Expense (Benefit)	8,500,000	7,300,000
Net income	17,100,000	15,500,000
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Net income (loss) applicable to controlling interest	17,100,000	15,500,000
Total assets	13,964,000,000	13,467,000,000
Average cash and due from banks	183,000,000	322,000,000
Average money market investments	2,046,000,000	2,503,000,000
Average Securities	285,000,000	242,000,000
Total loans	10,276,000,000	9,362,000,000
Total deposits	11,478,000,000	11,099,000,000
Preferred equity	226,000,000	153,000,000
Common equity	1,940,000,000	1,849,000,000
Noncontrolling interests	0	0
Total shareholders' equity	2,166,000,000	2,002,000,000
Number of branches	94
Amegy [Member]
Segment Reporting Information [Line Items]
Net interest income	95,700,000	109,200,000
Provision for loan losses	-4,100,000	-2,100,000
Net interest income after provision for loan losses	99,800,000	111,300,000
Other noninterest income	16,700,000	5,800,000
Noninterest expense	74,400,000	85,300,000
Income before income taxes	42,100,000	31,800,000
Income Tax Expense (Benefit)	16,400,000	12,100,000
Net income	25,700,000	19,700,000
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Net income (loss) applicable to controlling interest	25,700,000	19,700,000
Total assets	11,368,000,000	10,889,000,000
Average cash and due from banks	90,000,000	166,000,000
Average money market investments	1,659,000,000	1,129,000,000
Average Securities	337,000,000	327,000,000
Total loans	8,502,000,000	8,538,000,000
Total deposits	9,701,000,000	9,273,000,000
Preferred equity	162,000,000	162,000,000
Common equity	1,394,000,000	1,350,000,000
Noncontrolling interests	0	0
Total shareholders' equity	1,556,000,000	1,512,000,000
Number of branches	80
NBA [Member]
Segment Reporting Information [Line Items]
Net interest income	39,000,000	40,300,000
Provision for loan losses	700,000	-3,000,000
Net interest income after provision for loan losses	38,300,000	43,300,000
Other noninterest income	8,500,000	8,300,000
Noninterest expense	36,900,000	37,300,000
Income before income taxes	9,900,000	14,300,000
Income Tax Expense (Benefit)	3,400,000	5,200,000
Net income	6,500,000	9,100,000
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Net income (loss) applicable to controlling interest	6,500,000	9,100,000
Total assets	4,825,000,000	4,612,000,000
Average cash and due from banks	49,000,000	72,000,000
Average money market investments	396,000,000	289,000,000
Average Securities	412,000,000	365,000,000
Total loans	3,764,000,000	3,696,000,000
Total deposits	4,178,000,000	3,952,000,000
Preferred equity	85,000,000	120,000,000
Common equity	485,000,000	422,000,000
Noncontrolling interests	0	0
Total shareholders' equity	570,000,000	542,000,000
Number of branches	66
NSB [Member]
Segment Reporting Information [Line Items]
Net interest income	28,000,000	27,900,000
Provision for loan losses	-8,700,000	-2,600,000
Net interest income after provision for loan losses	36,700,000	30,500,000
Other noninterest income	9,000,000	4,900,000
Noninterest expense	32,100,000	32,100,000
Income before income taxes	13,600,000	3,300,000
Income Tax Expense (Benefit)	4,600,000	1,000,000
Net income	9,000,000	2,300,000
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Net income (loss) applicable to controlling interest	9,000,000	2,300,000
Total assets	4,164,000,000	3,991,000,000
Average cash and due from banks	71,000,000	88,000,000
Average money market investments	734,000,000	700,000,000
Average Securities	840,000,000	781,000,000
Total loans	2,384,000,000	2,306,000,000
Total deposits	3,755,000,000	3,598,000,000
Preferred equity	50,000,000	50,000,000
Common equity	332,000,000	318,000,000
Noncontrolling interests	0	0
Total shareholders' equity	382,000,000	368,000,000
Number of branches	50
Vectra [Member]
Segment Reporting Information [Line Items]
Net interest income	25,700,000	25,300,000
Provision for loan losses	3,800,000	-1,800,000
Net interest income after provision for loan losses	21,900,000	27,100,000
Other noninterest income	5,000,000	3,800,000
Noninterest expense	23,900,000	25,300,000
Income before income taxes	3,000,000	5,600,000
Income Tax Expense (Benefit)	700,000	1,800,000
Net income	2,300,000	3,800,000
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Net income (loss) applicable to controlling interest	2,300,000	3,800,000
Total assets	2,977,000,000	2,569,000,000
Average cash and due from banks	29,000,000	47,000,000
Average money market investments	339,000,000	14,000,000
Average Securities	191,000,000	164,000,000
Total loans	2,358,000,000	2,280,000,000
Total deposits	2,568,000,000	2,168,000,000
Preferred equity	25,000,000	70,000,000
Common equity	317,000,000	247,000,000
Noncontrolling interests	0	0
Total shareholders' equity	342,000,000	317,000,000
TCBW [Member]
Segment Reporting Information [Line Items]
Net interest income	6,700,000	7,000,000
Provision for loan losses	100,000	700,000
Net interest income after provision for loan losses	6,600,000	6,300,000
Other noninterest income	900,000	-1,000,000
Noninterest expense	6,900,000	4,500,000
Income before income taxes	600,000	800,000
Income Tax Expense (Benefit)	200,000	300,000
Net income	400,000	500,000
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Net income (loss) applicable to controlling interest	400,000	500,000
Total assets	896,000,000	873,000,000
Average cash and due from banks	29,000,000	21,000,000
Average money market investments	119,000,000	118,000,000
Average Securities	71,000,000	90,000,000
Total loans	661,000,000	631,000,000
Total deposits	766,000,000	742,000,000
Preferred equity	3,000,000	3,000,000
Common equity	90,000,000	88,000,000
Noncontrolling interests	0	0
Total shareholders' equity	93,000,000	91,000,000
Number of branches	1
Other Banks [Member]
Segment Reporting Information [Line Items]
Net interest income	-15,500,000	-30,400,000
Provision for loan losses	200,000	0
Net interest income after provision for loan losses	-15,700,000	-30,400,000
Other noninterest income	900,000	40,500,000
Noninterest expense	1,900,000	5,100,000
Income before income taxes	-16,700,000	5,000,000
Income Tax Expense (Benefit)	-6,000,000	1,600,000
Net income	-10,700,000	3,400,000
Net Income (Loss) Attributable to Noncontrolling Interest	-500,000	0
Net income (loss) applicable to controlling interest	-10,200,000	3,400,000
Total assets	51,000,000	758,000,000
Average cash and due from banks	-4,000,000	-17,000,000
Average money market investments	-248,000,000	-159,000,000
Average Securities	179,000,000	552,000,000
Total loans	54,000,000	65,000,000
Total deposits	-1,122,000,000	-1,032,000,000
Preferred equity	173,000,000	166,000,000
Common equity	214,000,000	-217,000,000
Noncontrolling interests	-11,000,000	0
Total shareholders' equity	376,000,000	-51,000,000
Consolidated Company [Member]
Segment Reporting Information [Line Items]
Net interest income	417,400,000	416,500,000
Provision for loan losses	-1,500,000	-600,000
Net interest income after provision for loan losses	418,900,000	417,100,000
Other noninterest income	121,800,000	138,300,000
Noninterest expense	397,500,000	398,100,000
Income before income taxes	143,200,000	157,300,000
Income Tax Expense (Benefit)	51,200,000	56,100,000
Net income	92,000,000	101,200,000
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Net income (loss) applicable to controlling interest	92,000,000	101,200,000
Total assets	56,818,000,000	55,434,000,000
Average cash and due from banks	744,000,000	1,038,000,000
Average money market investments	8,013,000,000	8,140,000,000
Average Securities	4,783,000,000	4,117,000,000
Total loans	40,179,000,000	39,125,000,000
Total deposits	47,484,000,000	45,780,000,000
Preferred equity	1,004,000,000	1,004,000,000
Common equity	6,405,000,000	5,595,000,000
Noncontrolling interests	0	0
Total shareholders' equity	$7,409,000,000	$6,599,000,000
TCBO [Member]
Segment Reporting Information [Line Items]
Number of branches	1
Utah [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of branches	100
Idaho [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of branches	25
WYOMING | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of branches	1
Colorado [Member] | Vectra [Member]
Segment Reporting Information [Line Items]
Number of branches	36
New Mexico [Member] | Vectra [Member]
Segment Reporting Information [Line Items]
Number of branches	1