Bbva Usa Bancshares 10-Q 13 Nov 14 2014 Q3 Quarterly report Financial data

DEI_Document

DEI Document	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Entity [Abstract]	'	'
Entity Registrant Name	'BBVA Compass Bancshares, Inc.	'
Entity Central Index Key	'0001409775	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	222,950,751

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:	'	'
Cash and due from banks	$4,643,636	$3,563,349
Federal funds sold, securities purchased under agreements to resell and interest bearing deposits	271,898	35,111
Cash and cash equivalents	4,915,534	3,598,460
Trading account assets	515,136	319,930
Investment securities available for sale	9,326,413	8,313,085
Investment securities held to maturity (fair value of $1,330,538 and $1,405,258 at September 30, 2014 and December 31, 2013, respectively)	1,417,985	1,519,196
Loans held for sale (includes $190,882 and $139,750 measured at fair value at September 30, 2014 and December 31, 2013, respectively)	190,882	147,109
Loans	55,009,233	50,667,016
Allowance for loan losses	-695,878	-700,719
Net loans	54,313,355	49,966,297
Premises and equipment, net	1,333,008	1,420,988
Bank owned life insurance	695,842	683,224
Goodwill	5,060,924	4,971,645
Other intangible assets	82,840	109,040
Other real estate owned	17,058	23,228
Other assets	1,323,212	893,274
Total assets	79,192,189	71,965,476
Deposits:	'	'
Noninterest bearing	16,979,235	15,377,844
Interest bearing	43,291,723	39,059,646
Total deposits	60,270,958	54,437,490
FHLB and other borrowings	4,551,050	4,298,707
Federal funds purchased and securities sold under agreements to repurchase	809,053	852,570
Other short-term borrowings	246,835	5,591
Accrued expenses and other liabilities	1,387,240	883,359
Total liabilities	67,265,136	60,477,717
Shareholder’s Equity:	'	'
Common stock - $0.01 par value; Authorized - 300,000,000 shares, Issued - 222,950,721 and 220,723,876 shares at September 30, 2014 and December 31, 2013, respectively	2,230	2,207
Surplus	15,333,316	15,273,218
Retained deficit	-3,364,389	-3,728,737
Accumulated other comprehensive loss	-73,846	-87,936
Total BBVA Compass Bancshares, Inc. shareholder’s equity	11,897,311	11,458,752
Noncontrolling interests	29,742	29,007
Total shareholder’s equity	11,927,053	11,487,759
Total liabilities and shareholder’s equity	$79,192,189	$71,965,476

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) Parenthetical (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Investment Securities - Fair Value	$1,330,538	$1,405,258
Loans Held for Sale - Fair Value	$190,882	$139,750
Common stock, par value	$0.01	$0.01
Common stock, number of shares authorized	300,000,000	300,000,000
Common stock, number of shares issued	222,950,751	220,723,876

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest income:	'	'	'	'
Interest and fees on loans	$509,766	$519,016	$1,538,788	$1,586,886
Interest on investment securities available for sale	48,363	41,904	145,706	133,559
Interest on investment securities held to maturity	6,862	7,701	21,111	23,132
Interest on federal funds sold, securities purchased under agreements to resell and interest bearing deposits	47	65	136	164
Interest on trading account assets	933	870	2,027	2,386
Total interest income	565,971	569,556	1,707,768	1,746,127
Interest expense:	'	'	'	'
Interest on deposits	66,763	50,031	180,880	160,221
Interest on FHLB and other borrowings	16,399	17,129	48,947	49,070
Interest on federal funds purchased and securities sold under agreements to repurchase	447	446	1,384	1,577
Interest on other short-term borrowings	394	39	516	87
Total interest expense	84,003	67,645	231,727	210,955
Net interest income	481,968	501,911	1,476,041	1,535,172
Provision for loan losses	3,869	37,534	86,387	81,386
Net interest income after provision for loan losses	478,099	464,377	1,389,654	1,453,786
Noninterest income:	'	'	'	'
Service charges on deposit accounts	57,537	54,229	165,886	164,601
Card and merchant processing fees	28,682	26,132	81,459	76,869
Retail investment sales	27,645	22,034	83,053	71,724
Investment banking and advisory fees	18,750	21,382	63,226	33,646
Asset management fees	10,666	10,438	31,959	31,143
Corporate and correspondent investment sales	5,388	8,011	22,016	26,954
Mortgage banking income	8,498	7,610	18,924	32,221
Bank owned life insurance	4,603	4,222	12,807	12,901
Investment securities gains, net	9,710	0	47,608	33,030
Gain (loss) on prepayment of FHLB and other borrowings	143	0	-315	21,775
Other	54,809	56,927	154,581	160,511
Total noninterest income	226,431	210,985	681,204	665,375
Noninterest expense:	'	'	'	'
Salaries, benefits and commissions	265,334	244,373	791,204	743,601
Equipment	56,355	50,483	165,562	148,989
Professional services	52,463	44,195	148,652	133,198
Net occupancy	39,357	39,257	118,514	117,622
FDIC indemnification expense	18,748	55,064	80,736	211,706
Amortization of intangibles	12,635	14,884	38,800	46,386
Securities impairment:	'	'	'	'
Other-than-temporary impairment	0	968	415	3,718
Less: non-credit portion recognized in other comprehensive income	0	0	235	2,288
Total securities impairment	0	968	180	1,430
Other	88,250	72,915	253,623	219,572
Total noninterest expense	533,142	522,139	1,597,271	1,622,504
Net income before income tax expense	171,388	153,223	473,587	496,657
Income tax expense	27,770	41,930	107,467	146,033
Net income	143,618	111,293	366,120	350,624
Less: net income attributable to noncontrolling interests	815	647	1,772	1,608
Net income attributable to shareholder	$142,803	$110,646	$364,348	$349,016

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$143,618	$111,293	$366,120	$350,624
Other comprehensive income (loss), net of tax:	'	'	'	'
Unrealized holding gains (losses) arising during period from securities available for sale	-11,272	-7,944	40,883	-100,261
Less: reclassification adjustment for net gains on sale of securities available for sale in net income	6,220	0	30,498	20,941
Net change in unrealized holding gains (losses) on securities available for sale	-17,492	-7,944	10,385	-121,202
Change in unamortized net holding losses on investment securities held to maturity	2,398	2,040	7,183	8,085
Less: non-credit related impairment on investment securities held to maturity	0	0	151	1,450
Change in unamortized non-credit related impairment on investment securities held to maturity	249	171	732	1,257
Net change in unamortized holding losses on securities held to maturity	2,647	2,211	7,764	7,892
Unrealized holding gains (losses) arising during period from cash flow hedge instruments	-706	226	-2,388	6,491
Change in defined benefit plans	0	1	-1,671	681
Other comprehensive income (loss), net of tax	-15,551	-5,506	14,090	-106,138
Comprehensive income	128,067	105,787	380,210	244,486
Less: comprehensive income attributable to noncontrolling interests	815	647	1,772	1,608
Comprehensive income attributable to shareholder	$127,252	$105,140	$378,438	$242,878

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Shareholder's Equity (Unaudited) (USD $)	Total	Common Stock	Surplus	Retained Deficit	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
In Thousands, unless otherwise specified
Balance, beginning of period at Dec. 31, 2012	$11,083,573	$2,173	$15,172,910	($4,146,573)	$26,058	$29,005
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income	350,624	'	'	349,016	'	1,608
Other comprehensive income (loss), net of tax	-106,138	'	'	'	-106,138	'
Issuance of common stock	100,000	34	99,966	'	'	'
Dividends	-1,036	'	'	'	'	-1,036
Vesting of restricted stock	-5,726	'	-5,726	'	'	'
Restricted stock retained to cover taxes	-2,174	'	-2,174	'	'	'
Amortization of stock-based deferred compensation	2,273	'	2,273	'	'	'
Balance, end of period at Sep. 30, 2013	11,421,396	2,207	15,267,249	-3,797,557	-80,080	29,577
Balance, beginning of period at Dec. 31, 2013	11,487,759	2,207	15,273,218	-3,728,737	-87,936	29,007
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income	366,120	'	'	364,348	'	1,772
Other comprehensive income (loss), net of tax	14,090	'	'	'	14,090	'
Issuance of common stock	117,000	23	116,977	'	'	'
Dividends	-52,037	'	-51,000	'	'	-1,037
Vesting of restricted stock	-4,702	'	-4,702	'	'	'
Restricted stock retained to cover taxes	-2,507	'	-2,507	'	'	'
Amortization of stock-based deferred compensation	1,330	'	1,330	'	'	'
Balance, end of period at Sep. 30, 2014	$11,927,053	$2,230	$15,333,316	($3,364,389)	($73,846)	$29,742

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Operating Activities:	'	'
Net income	$366,120	$350,624
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	202,924	126,595
Securities impairment	180	1,430
Amortization of intangibles	38,800	46,386
Accretion of discount, loan fees and purchase market adjustments, net	-125,587	-145,400
Net change in FDIC indemnification asset/liability	80,736	211,706
Provision for loan losses	86,387	81,386
Amortization of stock based compensation	1,330	2,273
Net change in trading account assets	-195,206	169,792
Net change in trading account liabilities	-20,600	-195,062
Net change in loans held for sale	-29,644	201,174
Deferred tax (benefit) expense	-37,057	27,445
Investment securities gains, net	-47,608	-33,030
(Gain) loss on prepayment of FHLB and other borrowings	315	-21,775
Loss on sale of premises and equipment	5,162	1,401
Loss on sale of student loans	75	0
Net (gain) loss on sale of other real estate and other assets	-956	1,875
Loss on disposition	981	0
Increase in other assets	-436,361	-101,424
Decrease in other liabilities	456,534	48,379
Net cash provided by operating activities	346,525	773,775
Investing Activities:	'	'
Proceeds from sales of investment securities available for sale	960,744	803,347
Proceeds from prepayments, maturities and calls of investment securities available for sale	1,019,919	1,588,350
Purchases of investment securities available for sale	-2,992,721	-2,921,969
Proceeds from prepayments, maturities and calls of investment securities held to maturity	116,274	175,855
Purchases of investment securities held to maturity	-2,654	-210,811
Net change in loan portfolio	-4,435,927	-4,447,549
Purchase of premises and equipment	-58,748	-102,064
Proceeds from sale of premises and equipment	15,563	6,762
Net cash paid in acquisition	-97,566	0
Proceeds from sales of loans	101,740	162,958
Payments to FDIC for covered assets	-13,863	-20,323
Proceeds from sales of other real estate owned	21,095	64,365
Net cash used in investing activities	-5,366,144	-4,901,079
Financing Activities:	'	'
Net increase in demand deposits, NOW accounts and savings accounts	4,914,997	1,300,215
Net increase (decrease) in time deposits	910,489	-701,292
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase	-43,517	16,437
Net increase in other short-term borrowings	241,244	25,113
Proceeds from FHLB and other borrowings	1,694,297	425,000
Repayment of FHLB and other borrowings	-1,438,571	-344,003
Vesting of restricted stock	-4,702	-5,726
Restricted stock grants retained to cover taxes	-2,507	-2,174
Issuance of common stock	117,000	100,000
Common dividends paid	-51,000	0
Preferred dividends paid	-1,037	-1,036
Net cash provided by financing activities	6,336,693	812,534
Net increase (decrease) in cash and cash equivalents	1,317,074	-3,314,770
Cash and cash equivalents at beginning of year	3,598,460	6,158,442
Cash and cash equivalents at end of period	$4,915,534	$2,843,672

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	General
	The accounting and reporting policies of the Company and the methods of applying those policies that materially affect the consolidated financial statements conform with U.S. GAAP and with general financial services industry practices. The accompanying interim financial statements have been prepared in accordance with the rules and regulations of the SEC and, therefore, do not include all information and notes to the consolidated financial statements necessary for a complete presentation of financial position, results of operations, comprehensive income and cash flows in conformity with U.S. GAAP. In the opinion of management, all adjustments, consisting of normal and recurring items, necessary for the fair presentation of the consolidated financial statements have been included. Operating results for the three and nine months ended September 30, 2014, are not necessarily indicative of the results that may be expected for the year ended December 31, 2014. These interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year-ended December 31, 2013.
	The Company has evaluated subsequent events for potential recognition and disclosure through the filing date of this Quarterly Report on Form 10-Q, to determine if either recognition or disclosure of significant events or transactions is required.
	Use of Estimates in the Preparation of Financial Statements
	The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period, the most significant of which relate to the allowance for loan losses, goodwill impairment, fair value measurements and income taxes. Actual results could differ from those estimates.
	Recently Issued Accounting Standards
	Obligations Resulting from Joint and Several Liability Arrangements with Fixed Obligations
	In February 2013, the FASB released ASU 2013-04, Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation Is Fixed at the Reporting Date (a consensus of the FASB Emerging Issues Task Force), which provides guidance for the recognition, measurement and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date, except for obligations addressed within existing guidance in U.S. GAAP. Examples of obligations within the scope of this ASU include debt arrangements, other contractual obligations, and settled litigation and judicial rulings. The guidance in this ASU requires an entity to measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date as the sum of (a) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and (b) any additional amount the reporting entity expects to pay on behalf of its co-obligors. The guidance in this ASU also requires an entity to disclose the nature and amount of the obligations as well as other information about those obligations. The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013, with retrospective application and was adopted by the Company on January 1, 2014. The adoption of this standard did not have a material impact on the financial condition or results of operations of the Company.
	Presentation of Unrecognized Tax Benefits
	In July 2013, the FASB released ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The ASU requires that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. However, if a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The ASU is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013 and was adopted by the Company on January 1, 2014. The adoption of this standard did not have a material impact on the financial condition or results of operations of the Company.
	Accounting for Investments in Qualified Affordable Housing Projects
	In January 2014, the FASB released ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The ASU provides guidance on accounting for investments by a reporting entity in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for the low income housing tax credit. The amendments in this ASU permit reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense. The amendments in this ASU should be applied retrospectively to all periods presented. A reporting entity that uses the effective yield method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply the effective yield method for those preexisting investments. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. Early adoption is permitted and the Company elected to early adopt the amendments in this ASU on January 1, 2014. The adoption of this standard did not have a material impact on the financial condition or results of operations of the Company.
	Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure
	In January 2014, the FASB released ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The amendments in this ASU clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in this ASU are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. An entity can elect to adopt the amendments in this ASU using either a modified retrospective transition method or a prospective transition method. The adoption of this standard is not expected to have a material impact on the financial condition or results of operations of the Company.
	Revenue from Contracts with Customers
	In May 2014, the FASB released ASU 2014-09, Revenue from Contracts with Customers. The core principle of this guidance requires an entity to recognize revenue upon the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides five steps to be analyzed to accomplish the core principle. The amendments in this ASU are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2016. Early application is not permitted. The Company is currently assessing the impact that the adoption of this standard will have on the financial condition and results of operations of the Company.
	Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures
	In June 2014, the FASB issued ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The amendments in this ASU change the accounting for repurchase-to-maturity transactions to secured borrowing accounting. In addition, for repurchase financing arrangements, the amendments require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. The amendments in this ASU also require disclosures on transfers accounted for as sales in transactions that are economically similar to repurchase agreements, and provide increased transparency about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The accounting changes in this ASU and disclosures for certain transactions accounted for as a sale are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. The disclosures for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014 and for interim periods beginning after March 15, 2015. The adoption of this standard is not expected to have a material impact on the financial condition or results of operations of the Company.
	Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure
	In August 2014, the FASB issued ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure. The amendments in this ASU address the classification and measurement of foreclosed loans which were part of a government-sponsored loan guarantee program. If certain criteria are met, the loan should be derecognized and a separate other receivable should be recorded upon foreclosure at the amount of the loan balance expected to be recovered from the guarantor. The amendments in this ASU are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. The adoption of this standard is not expected to have a material impact on the financial condition or results of operations of the Company.

Acquisition_Activities

Acquisition Activities	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Acquisition Activities	'
	Acquisition Activities
	BBVA Securities Inc.
	On April 8, 2013, BBVA contributed all of the outstanding stock of its wholly-owned subsidiary, BSI, to the Parent. BSI is a registered broker-dealer and engages in investment banking and institutional sales of fixed income securities. Because of the related nature of the Company and BSI, this transaction was accounted for as a merger of entities under common control resulting in all periods prior to the transaction being retrospectively adjusted to include the historical activity of BSI.
	Simple Finance Technology Corp
	On March 20, 2014, the Bank acquired all of the voting equity interest of Simple, a U.S. based digital banking services firm. The Bank acquired assets of approximately $17 million (including cash, premises and equipment, and other assets), assumed liabilities of approximately $2 million (including accounts payable, accrued payroll and other liabilities), and recorded goodwill of $91 million and other intangible assets of $13 million. Consideration for the acquisition included $98 million in cash as well as $16 million of contingent consideration. The Bank recognized $3.5 million of acquisition-related costs in noninterest expense in the Company's Unaudited Condensed Consolidated Statement of Income for the nine months ended September 30, 2014. The revenues and earnings of Simple were not material for the three and nine months ended September 30, 2014.
	This acquisition was accounted for under the acquisition method in accordance with FASB ASC Topic 805. Accordingly, the assets and liabilities, both tangible and intangible, were recorded at their estimated fair values as of the acquisition date. Due to the timing of the closing of the acquisition, the fair values of other intangibles recorded are subject to adjustment as additional information becomes available to indicate a more accurate or appropriate fair value for the intangibles during the measurement period, which is not to exceed one year from the acquisition date.

Investment_Securities_Availabl

Investment Securities Available for Sale and Investment Securities Held to Maturity	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Investment Securities Available for Sale and Investment Securities Held to Maturity	'
	Investment Securities Available for Sale and Investment Securities Held to Maturity
	The following table presents the adjusted cost and approximate fair value of investment securities available for sale and investment securities held to maturity.
		30-Sep-14
					Gross Unrealized
		Amortized Cost			Gains			Losses		Fair Value
		(In Thousands)
	Investment securities available for sale:
	Debt securities:
	U.S. Treasury and other U.S. government agencies	$	1,219,222		$	4,363		$	10,004	$	1,213,581
	Mortgage-backed securities	4,685,339			58,800			49,740		4,694,399
	Collateralized mortgage obligations	2,404,672			18,224			7,386		2,415,510
	States and political subdivisions	483,016			8,690			2,919		488,787
	Other	29,014			146			33		29,127
	Equity securities	484,958			51			—		485,009
	Total	$	9,306,221		$	90,274		$	70,082	$	9,326,413
	Investment securities held to maturity:
	Collateralized mortgage obligations	$	130,442		$	6,657		$	5,362	$	131,737
	Asset-backed securities	43,153			3,747			2,368		44,532
	States and political subdivisions	1,167,183			1,455			98,423		1,070,215
	Other	77,207			6,847			—		84,054
	Total	$	1,417,985		$	18,706		$	106,153	$	1,330,538
		31-Dec-13
					Gross Unrealized
		Amortized Cost			Gains			Losses		Fair Value
		(In Thousands)
	Investment securities available for sale:
	Debt securities:
	U.S. Treasury and other U.S. government agencies	$	257,844		$	4,338		$	1,245	$	260,937
	Mortgage-backed securities	5,232,504			75,912			74,625		5,233,791
	Collateralized mortgage obligations	1,747,450			23,312			14,364		1,756,398
	States and political subdivisions	518,755			8,041			17,360		509,436
	Other	40,415			27			109		40,333
	Equity securities	512,136			54			—		512,190
	Total	$	8,309,104		$	111,684		$	107,703	$	8,313,085
	Investment securities held to maturity:
	Collateralized mortgage obligations	$	145,989		$	19,848		$	3,900	$	161,937
	Asset-backed securities	67,590			4,008			6,183		65,415
	States and political subdivisions	1,225,977			843			139,816		1,087,004
	Other	79,640			13,191			1,929		90,902
	Total	$	1,519,196		$	37,890		$	151,828	$	1,405,258
	In the above table, equity securities include $485 million and $512 million at September 30, 2014 and December 31, 2013, respectively, of FHLB and Federal Reserve stock carried at par.
	The investments held within the states and political subdivision caption of investment securities held to maturity relate to private placement transactions underwritten as loans by the Company but that meet the definition of a security within ASC Topic 320, Investments – Debt and Equity Securities.
	The following table discloses the fair value and the gross unrealized losses of the Company’s available for sale securities and held to maturity securities that were in a loss position at September 30, 2014 and December 31, 2013. This information is aggregated by investment category and the length of time the individual securities have been in an unrealized loss position.
		September 30, 2014
		Securities in a loss position for less than 12 months						Securities in a loss position for 12 months or longer					Total
		Fair Value			Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
		(In Thousands)
	Investment securities available for sale:
	Debt securities:
	U.S. Treasury and other U.S. government agencies	$	693,763		$	8,863		$	37,917	$	1,141		$	731,680	$	10,004
	Mortgage-backed securities	428,804			1,281			2,101,846		48,459			2,530,650		49,740
	Collateralized mortgage obligations	766,153			4,410			160,757		2,976			926,910		7,386
	States and political subdivisions	39,804			116			159,652		2,803			199,456		2,919
	Other	3,923			4			1,092		29			5,015		33
	Total	$	1,932,447		$	14,674		$	2,461,264	$	55,408		$	4,393,711	$	70,082
	Investment securities held to maturity:
	Collateralized mortgage obligations	$	25,551		$	1,000		$	30,035	$	4,362		$	55,586	$	5,362
	Asset-backed securities	4,677			48			25,145		2,320			29,822		2,368
	States and political subdivisions	8,743			35			880,861		98,388			889,604		98,423
	Other	—			—			—		—			—		—
	Total	$	38,971		$	1,083		$	936,041	$	105,070		$	975,012	$	106,153
		December 31, 2013
		Securities in a loss position for less than 12 months						Securities in a loss position for 12 months or longer					Total
	Fair Value			Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In Thousands)
Investment securities available for sale:
Debt securities:
U.S. Treasury and other U.S. government agencies	$	119,871		$	1,245		$	—	$	—		$	119,871	$	1,245
Mortgage-backed securities	2,462,822			69,919			339,448		4,706			2,802,270		74,625
Collateralized mortgage obligations	699,693			9,123			108,710		5,241			808,403		14,364
States and political subdivisions	164,472			9,244			92,407		8,116			256,879		17,360
Other	4,939			109			—		—			4,939		109
Total	$	3,451,797		$	89,640		$	540,565	$	18,063		$	3,992,362	$	107,703
Investment securities held to maturity:
Collateralized mortgage obligations	$	1,466		$	17		$	32,370	$	3,883		$	33,836	$	3,900
Asset-backed securities	—			—			33,362		6,183			33,362		6,183
States and political subdivisions	313,438			26,760			642,799		113,056			956,237		139,816
Other	—			—			4,600		1,929			4,600		1,929
Total	$	314,904		$	26,777		$	713,131	$	125,051		$	1,028,035	$	151,828
As noted in the previous tables, at September 30, 2014, the Company held certain investment securities in unrealized loss positions. The Company does not have the intent to sell these securities and believes it is not more likely than not that it will be required to sell these securities before their anticipated recovery.
The Company regularly evaluates each available for sale and held to maturity security in a loss position for OTTI. In its evaluation, the Company considers such factors as the length of time and the extent to which the fair value has been below cost, the financial condition of the issuer, the Company’s intent to hold the security to an expected recovery in market value and whether it is more likely than not that the Company will have to sell the security before its fair value recovers. Activity related to the credit loss component of the OTTI is recognized in earnings. The portion of OTTI related to all other factors is recognized in other comprehensive income.
Management does not believe that any individual unrealized loss in the Company’s investment securities available for sale or held to maturity portfolios, presented in the preceding tables, represents an OTTI at either September 30, 2014 or December 31, 2013, other than those noted below.
The following table discloses activity related to credit losses for debt securities where a portion of the OTTI was recognized in other comprehensive income.
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2014			2013			2014		2013
	(In Thousands)
Balance at beginning of period	$	21,123		$	17,541		$	20,943	$	17,318
Reductions for securities paid off during the period (realized)	—			—			—		(239		)
Additions for the credit component on debt securities in which OTTI was not previously recognized	—			—			—		—
Additions for the credit component on debt securities in which OTTI was previously recognized	—			968			180		1,430
Balance at end of period	$	21,123		$	18,509		$	21,123	$	18,509
For the three months ended September 30, 2014, there was no OTTI recognized on held to maturity securities, and for the three months ended September 30, 2013, the Company recognized $968 thousand. For the nine months ended September 30, 2014 and 2013, OTTI recognized on held to maturity securities totaled $180 thousand and $1.4 million, respectively. The investment securities primarily impacted by credit impairment are held to maturity non-agency collateralized mortgage obligations and asset-backed securities.
The maturities of the securities portfolios are presented in the following table.
September 30, 2014		Amortized Cost			Fair Value
		(In Thousands)
Investment securities available for sale:
Maturing within one year		$	55,034		$	56,026
Maturing after one but within five years		304,190			307,836
Maturing after five but within ten years		454,373			457,511
Maturing after ten years		917,655			910,122
		1,731,252			1,731,495
Mortgage-backed securities and collateralized mortgage obligations		7,090,011			7,109,909
Equity securities		484,958			485,009
Total		$	9,306,221		$	9,326,413
Investment securities held to maturity:
Maturing within one year		$	31,388		$	31,168
Maturing after one but within five years		318,323			300,768
Maturing after five but within ten years		195,466			187,126
Maturing after ten years		742,366			679,739
		1,287,543			1,198,801
Collateralized mortgage obligations		130,442			131,737
Total		$	1,417,985		$	1,330,538
The gross realized gains and losses recognized on sales of investment securities available for sale are shown in the table below.
	Three Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014		2013
	(In Thousands)
Gross gains	$	9,710		$	—		$	47,608	$	33,030
Gross losses	—			—			—		—
Net realized gains	$	9,710		$	—		$	47,608	$	33,030

Loans_and_Allowance_for_Loan_L

Loans and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2014
Receivables [Abstract]	'
Loans and Allowance for Loan Losses	'
	Loans and Allowance for Loan Losses
	The following table presents the composition of the loan portfolio.
		September 30, 2014				December 31, 2013
		(In Thousands)
	Commercial loans:
	Commercial, financial and agricultural	$	22,510,956			$	20,209,209
	Real estate – construction	1,977,784				1,736,348
	Commercial real estate – mortgage	9,498,561				9,106,329
	Total commercial loans	33,987,301				31,051,886
	Consumer loans:
	Residential real estate – mortgage	13,606,816				12,706,879
	Equity lines of credit	2,259,561				2,236,367
	Equity loans	629,047				644,068
	Credit card	631,000				660,073
	Consumer – direct	609,980				516,572
	Consumer – indirect	2,704,772				2,116,981
	Total consumer loans	20,441,176				18,880,940
	Covered loans	580,756				734,190
	Total loans	$	55,009,233			$	50,667,016
	Purchased Impaired Loans
	Purchased Impaired Loans are recognized on the Company's Unaudited Condensed Consolidated Balance Sheets within loans, net of recorded discount. The following table presents the unpaid principal balance, discount, allowance for loan losses and carrying value of the Purchased Impaired Loans.
		September 30, 2014				December 31, 2013
		(In Thousands)
	Unpaid principal balance	$	393,351			$	449,429
	Discount	(24,092		)		(60,069		)
	Allowance for loan losses	(4,198		)		(243		)
	Carrying value	$	365,061			$	389,117
	An analysis of the accretable yield related to the Purchased Impaired Loans follows.
		Nine Months Ended September 30,
		2014				2013
		(In Thousands)
	Balance at beginning of period	$	105,698			$	136,992
	Transfer from nonaccretable difference	7,229				32,831
	Accretion	(39,925		)		(49,916		)
	Other	—				1,516
	Balance at end of period	$	73,002			$	121,423
	The Company had allowances of $4.2 million and $243 thousand related to Purchased Impaired Loans at September 30, 2014 and December 31, 2013, respectively. During the three months ended September 30, 2014 and 2013, the Company recognized $(3.3) million and $(800) thousand, respectively, of provision for loan losses attributable to credit improvements subsequent to acquisition of these loans. During the nine months ended September 30, 2014 and 2013, the Company recognized $(800) thousand and $(5.4) million, respectively, of provision for loan losses attributable to credit improvements subsequent to acquisition of these loans.
	Purchased Nonimpaired Loans
	At acquisition, Purchased Nonimpaired Loans were determined to have fair value discounts, some of which were related to credit. The portion of the fair value discount not related to credit is being accreted to interest income over the expected remaining life of the loans based on expected cash flows. For the three months ended September 30, 2014 and 2013 approximately $19.4 million and $51.3 million, respectively, of interest income was recognized on these loans. For the nine months ended September 30, 2014 and 2013 approximately $92.6 million and $221.4 million, respectively, of interest income was recognized on these loans. The discount related to credit on the Purchased Nonimpaired Loans is reviewed for adequacy at each balance sheet date. If the expected losses exceed the credit discount, an allowance for loan losses is provided. If the expected losses are reduced, the related credit discount is accreted to interest income over the expected remaining life of the loans.
	The following table presents the unpaid principal balance, discount, allowance for loan losses, and carrying value of the Purchased Nonimpaired Loans.
		September 30, 2014				December 31, 2013
		(In Thousands)
	Unpaid principal balance	$	337,255			$	520,723
	Discount	(125,758		)		(175,893		)
	Allowance for loan losses	(2,408		)		(2,711		)
	Carrying value	$	209,089			$	342,119
	The following table reflects the recorded investment in all covered Purchased Impaired Loans and Purchased Nonimpaired Loans.
		September 30, 2014												December 31, 2013
		Purchased Impaired Loans				Purchased Nonimpaired Loans				Total Covered Loans				Purchased Impaired Loans			Purchased Nonimpaired Loans			Total Covered Loans
		(In Thousands)
	Commercial, financial and agricultural	$	—			$	45,450			$	45,450			$	—		$	40,892		$	40,892
	Commercial real estate (1)	—				21,220				21,220				4,760			141,333			146,093
	Residential real estate – mortgage (2)	369,259				138,550				507,809				384,588			155,452			540,040
	Consumer loans	—				6,277				6,277				12			7,153			7,165
	Total loans	$	369,259			$	211,497			$	580,756			$	389,360		$	344,830		$	734,190
	-1	Includes real estate – construction and commercial real estate - mortgage.
	-2	Includes residential real estate – mortgage, equity lines of credit and equity loans.
	FDIC Indemnification Asset (Liability)
	The Company has entered into loss sharing agreements with the FDIC that require the FDIC to reimburse the Bank for losses with respect to covered loans and covered OREO. In addition, the provisions of the loss sharing agreements may also require a payment by the Bank to the FDIC on October 15, 2019. Activity associated with the Company's estimate of the potential amount of this payment is included in the table below. See Note 8, Commitments, Contingencies and Guarantees, for additional information related to the loss sharing agreements. A summary of the activity in the FDIC indemnification asset (liability) is presented in the following table.
		Nine Months Ended September 30,
		2014				2013
		(In Thousands)
	Balance at beginning of period	$	24,315			$	271,928
Increase (decrease) due to credit loss provision (benefit) recorded on FDIC covered loans	5,374				(8,489		)
Amortization and accretion, net	(82,277		)		(199,021		)
Payments to FDIC for covered assets	13,863				20,323
Other	(3,833		)		(4,196		)
Balance at end of period	$	(42,558	)		$	80,545
Other adjustments include those resulting from the change in loss estimates related to OREO as a result of changes in expected cash flows as well as adjustments resulting from amounts owed to the FDIC for unexpected recoveries of amounts previously charged off and loan expenses incurred and claimed.
Allowance for Loan Losses and Credit Quality
The following table, which excludes loans held for sale, presents a summary of the activity in the allowance for loan losses. The portion of the allowance that has not been identified by the Company as related to specific loan categories has been allocated to the individual loan categories on a pro rata basis for purposes of the table below:
	Commercial, Financial and Agricultural				Commercial Real Estate (1)				Residential Real Estate (2)				Consumer (3)			Covered			Total Loans
	(In Thousands)
Three months ended September 30, 2014
Allowance for loan losses:
Beginning balance	$	317,790			$	142,941			$	153,694			$	88,784		$	11,551		$	714,760
Provision charged to income	(6,889		)		(8,180		)		6,963				16,216			(4,241		)	3,869
Loans charged off	(3,404		)		(555		)		(9,852		)		(20,514		)	(1,124		)	(35,449		)
Loan recoveries	3,818				1,285				3,266				3,909			420			12,698
Net charge offs	414				730				(6,586		)		(16,605		)	(704		)	(22,751		)
Ending balance	$	311,315			$	135,491			$	154,071			$	88,395		$	6,606		$	695,878
Three months ended September 30, 2013
Allowance for loan losses:
Beginning balance	$	290,188			$	182,613			$	158,793			$	83,702		$	8,215		$	723,511
Provision charged to income	16,690				(13,901		)		19,862				17,307			(2,424		)	37,534
Loans charged off	(7,833		)		(6,525		)		(23,996		)		(17,674		)	(3,019		)	(59,047		)
Loan recoveries	3,685				3,120				3,926				4,064			1,144			15,939
Net charge offs	(4,148		)		(3,405		)		(20,070		)		(13,610		)	(1,875		)	(43,108		)
Ending balance	$	302,730			$	165,307			$	158,585			$	87,399		$	3,916		$	717,937
Nine Months Ended September 30, 2014
Allowance for loan losses:
Beginning balance	$	292,327			$	158,960			$	155,575			$	90,903		$	2,954		$	700,719
Provision charged to income	30,107				(17,959		)		27,675				46,014			550			86,387
Loans charged off	(23,855		)		(10,506		)		(39,421		)		(62,887		)	(2,131		)	(138,800		)
Loan recoveries	12,736				4,996				10,242				14,365			5,233			47,572
Net charge offs	(11,119		)		(5,510		)		(29,179		)		(48,522		)	3,102			(91,228		)
Ending balance	$	311,315			$	135,491			$	154,071			$	88,395		$	6,606		$	695,878
Nine Months Ended September 30, 2013
Allowance for loan losses:
Beginning balance	$	283,058			$	254,324			$	172,265			$	75,403		$	17,803		$	802,853
Provision charged to income	37,167				(70,315		)		73,709				50,936			(10,111		)	81,386
Loans charged off	(31,044		)		(34,268		)		(96,289		)		(52,744		)	(6,444		)	(220,789		)
Loan recoveries	13,549				15,566				8,900				13,804			2,668			54,487
Net charge offs	(17,495		)		(18,702		)		(87,389		)		(38,940		)	(3,776		)	(166,302		)
Ending balance	$	302,730			$	165,307			$	158,585			$	87,399		$	3,916		$	717,937
-1	Includes commercial real estate – mortgage and real estate – construction loans.
-2	Includes residential real estate – mortgage, equity lines of credit and equity loans.
-3	Includes credit card, consumer – direct and consumer – indirect loans.
The table below provides a summary of the allowance for loan losses and related loan balances by portfolio.
	Commercial, Financial and Agricultural				Commercial Real Estate (1)				Residential Real Estate (2)				Consumer (3)			Covered			Total Loans
	(In Thousands)
September 30, 2014
Ending balance of allowance attributable to loans:
Individually evaluated for impairment	$	20,620			$	6,403			$	39,683			$	1,031		$	—		$	67,737
Collectively evaluated for impairment	290,695				129,088				114,388				87,364			—			621,535
Covered purchased impaired	—				—				—				—			4,198			4,198
Covered purchased nonimpaired	—				—				—				—			2,408			2,408
Total allowance for loan losses	$	311,315			$	135,491			$	154,071			$	88,395		$	6,606		$	695,878
Loans:
Ending balance of loans:
Individually evaluated for impairment	$	70,086			$	114,165			$	192,909			$	1,431		$	—		$	378,591
Collectively evaluated for impairment	22,440,870				11,362,180				16,302,515				3,944,321			—			54,049,886
Covered purchased impaired	—				—				—				—			369,259			369,259
Covered purchased nonimpaired	—				—				—				—			211,497			211,497
Total loans	$	22,510,956			$	11,476,345			$	16,495,424			$	3,945,752		$	580,756		$	55,009,233
December 31, 2013
Ending balance of allowance attributable to loans:
Individually evaluated for impairment	$	28,828			$	9,408			$	41,989			$	1,526		$	—		$	81,751
Collectively evaluated for impairment	263,499				149,552				113,586				89,377			—			616,014
Covered purchased impaired	—				—				—				—			243			243
Covered purchased nonimpaired	—				—				—				—			2,711			2,711
Total allowance for loan losses	$	292,327			$	158,960			$	155,575			$	90,903		$	2,954		$	700,719
Loans:
Ending balance of loans:
Individually evaluated for impairment	$	138,047			$	167,598			$	196,723			$	1,625		$	—		$	503,993
Collectively evaluated for impairment	20,071,162				10,675,079				15,390,591				3,292,001			—			49,428,833
Covered purchased impaired	—				—				—				—			389,360			389,360
Covered purchased nonimpaired	—				—				—				—			344,830			344,830
Total loans	$	20,209,209			$	10,842,677			$	15,587,314			$	3,293,626		$	734,190		$	50,667,016
-1	Includes commercial real estate – mortgage and real estate – construction loans.
-2	Includes residential real estate – mortgage, equity lines of credit and equity loans.
-3	Includes credit card, consumer – direct and consumer – indirect loans.
The following table presents information on individually analyzed impaired loans, by loan class.
	September 30, 2014
	Individually Analyzed Impaired Loans With No Recorded Allowance												Individually Analyzed Impaired Loans With a Recorded Allowance
	Recorded Investment				Unpaid Principal Balance				Allowance				Recorded Investment			Unpaid Principal Balance			Allowance
	(In Thousands)
Commercial, financial and agricultural	$	6,098			$	12,694			$	—			$	63,988		$	75,458		$	20,620
Real estate – construction	4,509				5,040				—				2,851			3,420			507
Commercial real estate – mortgage	20,144				20,940				—				86,661			92,631			5,896
Residential real estate – mortgage	10,031				10,031				—				104,205			104,289			6,988
Equity lines of credit	—				—				—				24,189			24,235			22,815
Equity loans	—				—				—				54,484			54,814			9,880
Credit card	—				—				—				—			—			—
Consumer – direct	—				—				—				88			88			33
Consumer – indirect	—				—				—				1,343			1,343			998
Total loans	$	40,782			$	48,705			$	—			$	337,809		$	356,278		$	67,737
	December 31, 2013
	Individually Analyzed Impaired Loans With No Recorded Allowance												Individually Analyzed Impaired Loans With a Recorded Allowance
	Recorded Investment				Unpaid Principal Balance				Allowance				Recorded Investment			Unpaid Principal Balance			Allowance
	(In Thousands)
Commercial, financial and agricultural	$	19,984			$	27,639			$	—			$	118,063		$	138,092		$	28,828
Real estate – construction	1,314				1,555				—				9,248			10,812			836
Commercial real estate – mortgage	51,303				54,821				—				105,733			112,177			8,572
Residential real estate – mortgage	1,906				1,906				—				115,550			115,734			7,378
Equity lines of credit	—				—				—				23,593			24,021			23,190
Equity loans	—				—				—				55,674			55,794			11,421
Credit card	—				—				—				—			—			—
Consumer – direct	—				—				—				182			181			83
Consumer – indirect	—				—				—				1,443			1,443			1,443
Total loans	$	74,507			$	85,921			$	—			$	429,486		$	458,254		$	81,751
The following table presents information on individually analyzed impaired loans, by loan class.
	Three Months Ended September 30, 2014								Three Months Ended September 30, 2013
	Average Recorded Investment				Interest Income Recognized				Average Recorded Investment				Interest Income Recognized
	(In Thousands)
Commercial, financial and agricultural	$	70,256			$	182			$	151,326			$	286
Real estate – construction	9,054				58				16,666				94
Commercial real estate – mortgage	108,323				754				196,009				1,219
Residential real estate – mortgage	112,912				724				125,699				773
Equity lines of credit	24,010				268				23,835				254
Equity loans	54,506				432				51,822				395
Credit card	—				—				—				—
Consumer – direct	94				1				216				2
Consumer – indirect	1,276				1				1,735				1
Total loans	$	380,431			$	2,420			$	567,308			$	3,024
	Nine Months Ended September 30, 2014								Nine Months Ended September 30, 2013
	Average Recorded Investment				Interest Income Recognized				Average Recorded Investment				Interest Income Recognized
	(In Thousands)
Commercial, financial and agricultural	$	95,116			$	970			$	128,472			$	1,007
Real estate – construction	9,421				177				64,136				637
Commercial real estate – mortgage	122,358				2,531				222,189				3,478
Residential real estate – mortgage	113,579				2,168				147,853				2,710
Equity lines of credit	23,641				773				10,527				335
Equity loans	54,977				1,286				40,600				1,086
Credit card	—				—				—				—
Consumer – direct	131				3				170				30
Consumer – indirect	1,283				3				801				12
Total loans	$	420,506			$	7,911			$	614,748			$	9,295
The tables above do not include Purchased Impaired Loans or loans held for sale. At September 30, 2014, there were $1.4 million and $5.2 million of recorded investment and unpaid principal balance on covered Purchased Impaired Loans with credit deterioration subsequent to acquisition that were individually analyzed for impairment, respectively. There was no allowance for loan losses associated with these loans. At December 31, 2013, there were $4.8 million, $10.9 million, and $243 thousand of recorded investment, unpaid principal balance and allowance for loan losses on covered Purchased Impaired Loans with credit deterioration subsequent to acquisition that were individually analyzed for impairment, respectively. Covered Purchased Nonimpaired Loans are not included in the tables above as they are evaluated collectively on a pool basis and not on an individual basis.
Detailed information on the Company's allowance for loan losses methodology and the Company's impaired loan policy are included in the Company's Consolidated Financial Statements in the Annual Report on Form 10-K for the year ended December 31, 2013.
The Company monitors the credit quality of its commercial portfolio using an internal dual risk rating, which considers both the obligor and the facility. The obligor risk ratings are defined by ranges of default probabilities of the borrowers (AAA through D) and the facility risk ratings are defined by ranges of the loss given default. The combination of those two approaches results in the assessment of the likelihood of loss and it is mapped to the regulatory classifications. The Company assigns internal risk ratings at loan origination and at regular intervals subsequent to origination. Loan review intervals are dependent on the size and risk grade of the loan, and are generally conducted at least annually. Additional reviews are conducted when information affecting the loan’s risk grade becomes available. The general characteristics of the risk grades are as follows:
•	The Company’s internally assigned letter grades “AAA” through “B-” correspond to the regulatory classification “Pass.” These loans do not have any identified potential or well-defined weaknesses and have a high likelihood of orderly repayment. Exceptions exist when either the facility is fully secured by a CD and held at the Company or the facility is secured by properly margined and controlled marketable securities.
•	Internally assigned letter grades “CCC+” through “CCC” correspond to the regulatory classification “Special Mention.” Loans within this classification have potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or in the institution’s credit position at some future date. Special mention loans are not adversely classified and do not expose an institution to sufficient risk to warrant adverse classification.
•	Internally assigned letter grades “CCC-” through “D1” correspond to the regulatory classification “Substandard.” A loan classified as substandard is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the loan. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected.
•	The internally assigned letter grade “D2” corresponds to the regulatory classification “Doubtful.” Loans classified as doubtful have all the weaknesses inherent in one classified as substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable or improbable.
The Company considers payment history as the best indicator of credit quality for the consumer portfolio. Nonperforming loans in the tables below include loans classified as nonaccrual, loans 90 days or more past due and loans modified in a TDR 90 days or more past due.
The following tables, which exclude loans held for sale and covered loans, illustrate the credit quality indicators associated with the Company’s loans, by loan class.
	Commercial
	September 30, 2014
	Commercial, Financial and Agricultural				Real Estate - Construction				Commercial Real Estate - Mortgage
	(In Thousands)
Noncovered loans:
Pass	$	22,036,391			$	1,959,687			$	9,134,217
Special Mention	254,768				8,832				183,690
Substandard	188,293				7,891				153,722
Doubtful	31,504				1,374				26,932
	$	22,510,956			$	1,977,784			$	9,498,561
	December 31, 2013
	Commercial, Financial and Agricultural				Real Estate - Construction				Commercial Real Estate - Mortgage
	(In Thousands)
Noncovered loans:
Pass	$	19,582,014			$	1,707,719			$	8,562,261
Special Mention	353,638				9,918				271,500
Substandard	261,995				17,112				243,042
Doubtful	11,562				1,599				29,526
	$	20,209,209			$	1,736,348			$	9,106,329
	Consumer
	30-Sep-14
	Residential Real Estate – Mortgage				Equity Lines of Credit				Equity Loans				Credit Card			Consumer - Direct			Consumer –Indirect
	(In Thousands)
Noncovered loans:
Performing	$	13,499,841			$	2,222,138			$	608,848			$	622,226		$	607,594		$	2,701,787
Nonperforming	106,975				37,423				20,199				8,774			2,386			2,985
	$	13,606,816			$	2,259,561			$	629,047			$	631,000		$	609,980		$	2,704,772
	December 31, 2013
	Residential Real Estate -Mortgage				Equity Lines of Credit				Equity Loans				Credit Card			Consumer -Direct			Consumer –Indirect
	(In Thousands)
Noncovered loans:
Performing	$	12,601,515			$	2,199,827			$	621,897			$	649,796		$	513,630		$	2,113,918
Nonperforming	105,364				36,540				22,171				10,277			2,942			3,063
	$	12,706,879			$	2,236,367			$	644,068			$	660,073		$	516,572		$	2,116,981
Covered loans are excluded from the table above as an initial estimate of credit losses was embedded within the initial purchase discount established at acquisition. Periodically, the Company updates its estimated cash flows related to these covered loans. Increases in these updated cash flows over those expected at the purchase date are recognized as interest income prospectively. Decreases in estimated cash flows after the purchase date are recognized by recording an allowance for credit losses. Generally, since the acquisition of these covered loans, there has been considerable improvement in the expected credit losses with some minimal deterioration in credit quality seen within specific loans and pools of loans. To account for the subsequent deterioration in credit, an allowance for loan losses of $7 million was recorded on the $581 million covered portfolio at September 30, 2014 and an allowance for loan losses of $3 million was recorded on the $734 million covered loans portfolio at December 31, 2013.
The following tables present an aging analysis of the Company’s past due loans, excluding loans classified as held for sale and Purchased Impaired Loans.
	September 30, 2014
	30-59 Days Past Due				60-89 Days Past Due				90 Days or More Past Due				Nonaccrual			Accruing TDRs			Total Past Due and Impaired			Not Past Due or Impaired		Total
	(In Thousands)
Commercial, financial and agricultural	$	12,846			$	3,261			$	838			$	79,577		$	10,444		$	106,966		$	22,403,990	$	22,510,956
Real estate – construction	526				109				464				9,928			672			11,699			1,966,085		1,977,784
Commercial real estate – mortgage	7,716				3,129				3,448				92,718			43,023			150,034			9,348,527		9,498,561
Residential real estate – mortgage	37,711				20,447				2,474				104,192			72,590			237,414			13,369,402		13,606,816
Equity lines of credit	8,046				3,966				3,308				34,115			—			49,435			2,210,126		2,259,561
Equity loans	5,624				2,746				1,068				18,637			42,595			70,670			558,377		629,047
Credit card	5,566				3,718				8,774				—			—			18,058			612,942		631,000
Consumer – direct	7,751				1,678				1,984				402			57			11,872			598,108		609,980
Consumer – indirect	30,348				6,379				1,389				1,596			—			39,712			2,665,060		2,704,772
Covered loans	1,057				689				4,088				3,772			2,399			12,005			199,492		211,497
Total loans	$	117,191			$	46,122			$	27,835			$	344,937		$	171,780		$	707,865		$	53,932,109	$	54,639,974
	December 31, 2013
	30-59 Days Past Due				60-89 Days Past Due				90 Days or More Past Due				Nonaccrual			Accruing TDRs			Total Past Due and Impaired			Not Past Due or Impaired		Total
	(In Thousands)
Commercial, financial and agricultural	$	9,485			$	6,111			$	2,212			$	128,231		$	25,548		$	171,587		$	20,037,622	$	20,209,209
Real estate – construction	4,258				1,862				240				14,183			3,801			24,344			1,712,004		1,736,348
Commercial real estate – mortgage	9,521				4,869				797				129,672			59,727			204,586			8,901,743		9,106,329
Residential real estate – mortgage	48,597				22,629				2,460				102,904			74,236			250,826			12,456,053		12,706,879
Equity lines of credit	12,230				6,252				5,109				31,431			—			55,022			2,181,345		2,236,367
Equity loans	7,630				3,170				1,167				20,447			42,850			75,264			568,804		644,068
Credit card	5,955				4,676				10,277				—			—			20,908			639,165		660,073
Consumer – direct	8,736				3,000				2,402				540			91			14,769			501,803		516,572
Consumer – indirect	24,945				5,276				1,540				1,523			—			33,284			2,083,697		2,116,981
Covered loans	1,247				290				4,122				5,425			3,455			14,539			330,291		344,830
Total loans	$	132,604			$	58,135			$	30,326			$	434,356		$	209,708		$	865,129		$	49,412,527	$	50,277,656
Policies related to the Company's nonaccrual and past due loans are included in the Company's Consolidated Financial Statements in the Annual Report on Form 10-K for the year ended December 31, 2013.
It is the Company’s policy to classify TDRs that are not accruing interest as nonaccrual loans. It is also the Company’s policy to classify TDR past due loans that are accruing interest as TDRs and not according to their past due status. The tables above reflect this policy. The following table provides a breakout of TDRs, including nonaccrual loans and covered loans and excluding loans classified as held for sale.
	September 30, 2014
	30-59 Days Past Due				60-89 Days Past Due				90 Days or More Past Due				Nonaccrual			Total Past Due and Nonaccrual			Not Past Due or Nonaccrual			Total
	(In Thousands)
Commercial, financial and agricultural	$	—			$	—			$	188			$	18,517		$	18,705		$	10,256		$	28,961
Real estate – construction	—				—				—				175			175			672			847
Commercial real estate – mortgage	—				21				—				10,208			10,229			43,002			53,231
Residential real estate – mortgage	5,098				2,485				309				29,118			37,010			64,698			101,708
Equity lines of credit	—				—				—				24,189			24,189			—			24,189
Equity loans	2,094				2,069				494				11,994			16,651			37,938			54,589
Credit card	—				—				—				—			—			—			—
Consumer – direct	—				—				—				32			32			57			89
Consumer – indirect	—				—				—				1,342			1,342			—			1,342
Covered loans	6				214				—				1,369			1,589			2,179			3,768
Total loans	$	7,198			$	4,789			$	991			$	96,944		$	109,922		$	158,802		$	268,724
	December 31, 2013
	30-59 Days Past Due				60-89 Days Past Due				90 Days or More Past Due				Nonaccrual			Total Past Due and Nonaccrual			Not Past Due or Nonaccrual			Total
	(In Thousands)
Commercial, financial and agricultural	$	5			$	—			$	—			$	20,498		$	20,503		$	25,543		$	46,046
Real estate – construction	32				50				—				181			263			3,719			3,982
Commercial real estate – mortgage	2,345				—				—				13,910			16,255			57,382			73,637
Residential real estate – mortgage	3,755				2,747				760				30,492			37,754			66,974			104,728
Equity lines of credit	—				—				—				24,592			24,592			—			24,592
Equity loans	1,799				1,022				557				12,823			16,201			39,472			55,673
Credit card	—				—				—				—			—			—			—
Consumer – direct	—				—				—				90			90			91			181
Consumer – indirect	—				—				—				1,443			1,443			—			1,443
Covered loans	21				—				—				5,428			5,449			3,434			8,883
Total loans	$	7,957			$	3,819			$	1,317			$	109,457		$	122,550		$	196,615		$	319,165
As of September 30, 2014, there were no loans held for sale classified as TDRs. At December 31, 2013, there were $3.6 million of nonaccrual loans held for sale classified as TDRs.
Modifications to a borrower’s loan agreement are considered TDRs if a concession is granted for economic or legal reasons related to a borrower’s financial difficulties that otherwise would not be considered. Within each of the Company’s loan classes, TDRs typically involve modification of the loan interest rate to a below market rate or an extension or deferment of the loan. During the three months ended September 30, 2014, $1.4 million of TDR modifications included an interest rate concession and $19.6 million of TDR modifications resulted from modifications to the loan’s structure. During the three months ended September 30, 2013, $5.2 million of TDR modifications included an interest rate concession and $3.3 million of TDR modifications resulted from modifications to the loan’s structure. During the nine months ended September 30, 2014, $8.3 million of TDR modifications included an interest rate concession and $33.0 million of TDR modifications resulted from modifications to the loan’s structure. During the nine months ended September 30, 2013, $24.1 million of TDR modifications included an interest rate concession and $57.9 million of TDR modifications resulted from modifications to the loan’s structure.
The following table presents an analysis of the types of loans that were restructured and classified as TDRs, excluding loans classified as held for sale.
	Three Months Ended September 30, 2014							Three Months Ended September 30, 2013
	Number of Contracts			Post-Modification Outstanding Recorded Investment				Number of Contracts			Post-Modification Outstanding Recorded Investment
	(Dollars in Thousands)
Commercial, financial and agricultural	2			$	14,118			1			$	1,351
Real estate – construction	2			405				—			—
Commercial real estate – mortgage	—			—				1			115
Residential real estate – mortgage	18			3,255				21			2,527
Equity lines of credit	32			1,946				22			898
Equity loans	13			920				31			3,388
Credit card	—			—				—			—
Consumer – direct	—			—				2			5
Consumer – indirect	21			343				20			184
Covered loans	1			3				1			22
	Nine Months Ended September 30, 2014							Nine Months Ended September 30, 2013
	Number of Contracts			Post-Modification Outstanding Recorded Investment				Number of Contracts			Post-Modification Outstanding Recorded Investment
	(Dollars in Thousands)
Commercial, financial and agricultural	4			$	14,281			7			$	6,410
Real estate – construction	2			405				3			2,409
Commercial real estate – mortgage	9			6,586				14			3,947
Residential real estate – mortgage	74			8,373				190			26,038
Equity lines of credit	129			6,426				482			24,134
Equity loans	54			4,237				390			16,648
Credit card	—			—				—			—
Consumer – direct	—			—				17			138
Consumer – indirect	71			1,015				404			2,188
Covered loans	1			3				3			71
In response to guidance issued by a national bank regulatory agency, during the second quarter of 2013, the Company concluded that $52.6 million of loans that had been discharged in bankruptcy and not reaffirmed by the borrower should be classified as nonperforming TDRs. The Company estimated the allowance for loan losses for these loans based on collateral shortfall and accordingly the allowance for loan losses was increased by $33.5 million during the second quarter of 2013.
For the three and nine months ended September 30, 2014 and 2013, charge-offs and changes to the allowance related to modifications classified as TDRs, excluding the nonreaffirmed loans discharged in bankruptcy, were not material.
The Company considers TDRs 90 days or more past due, charged off or classified as nonaccrual subsequent to modification, where the loan was not classified as a nonperforming loan at the time of modification, as subsequently defaulted.
The following tables provide a summary of initial subsequent defaults that occurred within one year of the restructure date. The table excludes loans classified as held for sale as of period-end and includes loans no longer in default as of period-end.
	Three Months Ended September 30, 2014							Three Months Ended September 30, 2013
	Number of Contracts			Recorded Investment at Default				Number of Contracts			Recorded Investment at Default
	(Dollars in Thousands)
Commercial, financial and agricultural	—			$	—			—			$	—
Real estate – construction	—			—				—			—
Commercial real estate – mortgage	—			—				1			422
Residential real estate – mortgage	2			144				2			201
Equity lines of credit	—			—				5			309
Equity loans	3			381				5			370
Credit card	—			—				—			—
Consumer – direct	—			—				—			—
Consumer – indirect	—			—				—			—
Covered loans	—			—				1			35
	Nine Months Ended September 30, 2014							Nine Months Ended September 30, 2013
	Number of Contracts			Recorded Investment at Default				Number of Contracts			Recorded Investment at Default
	(Dollars in Thousands)
Commercial, financial and agricultural	—			$	—			1			$	9,531
Real estate – construction	—			—				—			—
Commercial real estate – mortgage	1			2,198				2			529
Residential real estate – mortgage	2			144				12			2,336
Equity lines of credit	3			275				5			309
Equity loans	7			763				6			424
Credit card	—			—				—			—
Consumer – direct	—			—				—			—
Consumer – indirect	—			—				—			—
Covered loans	—			—				1			35
The Company’s allowance for loan losses is largely driven by updated risk ratings assigned to commercial loans, updated borrower credit scores on consumer loans, and borrower delinquency history in both commercial and consumer portfolios.  As such, the provision for loan losses is impacted primarily by changes in borrower payment performance rather than TDR classification.  In addition, all commercial and consumer loans modified in a TDR are considered to be impaired, even if they maintain their accrual status.
At September 30, 2014 and December 31, 2013, there were $4.0 million and $3.9 million, respectively, of commitments to lend additional funds to borrowers whose terms have been modified in a TDR.

Loan_Sales_and_Servicing

Loan Sales and Servicing	9 Months Ended
	Sep. 30, 2014
Transfers and Servicing [Abstract]	'
Loan Sales and Servicing	'
	Loan Sales and Servicing
	The following table presents the composition of the loans held for sale portfolio.
		September 30, 2014			December 31, 2013
		(In Thousands)
	Loans held for sale:
	Real estate – construction	$	—		$	4,447
	Commercial real estate – mortgage	—			2,912
	Residential real estate – mortgage	190,882			139,750
	Total loans held for sale	$	190,882		$	147,109
	During the nine months ended September 30, 2014 and 2013, the Company transferred loans with a recorded balance immediately preceding the transfer totaling $14 million and $76 million, respectively, from the held for investment portfolio to loans held for sale. The Company recognized charge-offs upon transfer of these loans totaling $4.3 million and $22.0 million, respectively. There were no loans transferred from the held for investment portfolio to the loans held for sale portfolio during the three months ended September 30, 2014 and 2013. The Company sold loans and loans held for sale, excluding loans originated for sale in the secondary market, with a recorded balance of $1 million and $102 million during the three and nine months ended September 30, 2014, respectively, and $49 million and $163 million during the three and nine months ended September 30, 2013, respectively.
	Sales of residential real estate – mortgage loans originated for sale in the secondary market, including loans originated for sale where the Company retained servicing responsibilities, were $367 million and $736 million for the three and nine months ended September 30, 2014, respectively, and $422 million and $1.3 billion for the three and nine months ended September 30, 2013, respectively. The Company recognized net gains (losses) of $11.7 million and $22.9 million on the sale of residential mortgage loans originated for sale during the three and nine months ended September 30, 2014, respectively, and $(4.1) million and $15.7 million for the three and nine months ended September 30, 2013, respectively. These gains (losses) were recorded in mortgage banking income in the Company’s Unaudited Condensed Consolidated Statements of Income.
	Residential Real Estate Mortgage Loans Sold with Retained Servicing
	During the three and nine months ended September 30, 2014, the Company sold $367 million and $736 million, respectively, of residential mortgage loans originated for sale where the Company retained servicing responsibilities. During the three and nine months ended September 30, 2013, the Company sold $422 million and $1.3 billion, respectively, of residential mortgage loans originated for sale where the Company retained servicing responsibilities. For these sold loans, there is no recourse to the Company for the failures of debtors to pay when due. At September 30, 2014 and December 31, 2013, the Company was servicing $3.2 billion and $2.7 billion, respectively, of residential mortgage loans sold with retained servicing. These loans are not included in loans on the Company’s Unaudited Condensed Consolidated Balance Sheets.
	In connection with residential mortgage loans sold with retained servicing, the Company receives annual servicing fees based on a percentage of the outstanding balance. The Company recognized servicing fees of $4.1 million and $11.4 million during the three and nine months ended September 30, 2014, respectively. The Company recognized servicing fees of $3.0 million and $7.1 million during the three and nine months ended September 30, 2013, respectively. These fees were recorded as a component of other noninterest income in the Company’s Unaudited Condensed Consolidated Statements of Income. At September 30, 2014 and December 31, 2013, the Company had recorded $35 million and $30 million of servicing assets, respectively, under the fair value method in other assets on the Company’s Unaudited Condensed Consolidated Balance Sheets.
	The value of MSRs is significantly affected by mortgage interest rates available in the marketplace, which influence mortgage loan prepayment speeds. In general, during periods of declining rates, the value of MSRs declines due to increasing prepayments attributable to increased mortgage-refinance activity. During periods of rising interest rates, the fair value of mortgage servicing rights generally increases due to reduced refinance activity. The Company maintains a non-qualifying hedging strategy to manage a portion of the risk associated with changes in the value of the MSR portfolio.  This strategy includes the purchase of various trading securities.  The interest income, mark-to-market adjustments and gain or loss from sale activities associated with these securities are expected to economically hedge a portion of the change in the value of the MSR portfolio.
	The following table is an analysis of the activity in the Company’s residential MSRs.
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(In Thousands)
	Carrying value, at beginning of period	$	31,104		$	22,623		$	30,065		$	13,255
	Additions	4,060			4,865			8,066			13,998
	Increase (decrease) in fair value:
	Due to changes in valuation inputs or assumptions	367			1,914			(1,427		)	2,960
	Due to other changes in fair value (1)	(639		)	(341		)	(1,812		)	(1,152		)
	Carrying value, at end of period	$	34,892		$	29,061		$	34,892		$	29,061
	-1	Represents the realization of expected net servicing cash flows, expected borrower repayments and the passage of time.
	See Note 9, Fair Value of Financial Instruments, for additional disclosures related to the assumptions and estimates used in determining fair value of residential MSRs.
	At September 30, 2014 and December 31, 2013, the sensitivity of the current fair value of the residential MSRs to immediate 10% and 20% adverse changes in key economic assumptions are included in the following table:
		September 30, 2014			December 31, 2013
		(Dollars in Thousands)
	Fair value of residential mortgage servicing rights	$	34,892		$	30,065
	Composition of residential loans serviced for others:
	Fixed rate mortgage loans	96.1		%	96.4		%
	Adjustable rate mortgage loans	3.9			3.6
	Total	100		%	100		%
	Weighted average life (in years)	6.4			6.9
	Prepayment speed:	10		%	8.8		%
	Effect on fair value of a 10% increase	$	(1,085	)	$	(743	)
	Effect on fair value of a 20% increase	(2,131		)	(1,492		)
	Weighted average discount rate:	10.1		%	10		%
	Effect on fair value of a 10% increase	$	(1,272	)	$	(1,167	)
	Effect on fair value of a 20% increase	(2,453		)	(2,247		)
	The sensitivity calculations above are hypothetical and should not be considered to be predictive of future performance. As indicated, changes in fair value based on adverse changes in assumptions generally cannot be extrapolated because the relationship of the change in assumption to the change in fair value may not be linear. Also, in this table, the effect of an adverse variation in a particular assumption on the fair value of the MSRs is calculated without changing any other assumption; while in reality, changes in one factor may result in changes to another, which may magnify or counteract the effect of the change.

Derivatives_and_Hedging

Derivatives and Hedging	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivatives and Hedging	'
	Derivatives and Hedging
	The Company is a party to derivative instruments in the normal course of business for trading purposes and for purposes other than trading to meet the financing needs of its customers and to reduce its own exposure to fluctuations in interest rates and foreign currency exchange rates. The Company has made an accounting policy decision to not offset derivative fair value amounts under master netting agreements. See Summary of Significant Accounting Policies in the Notes to Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2013 for additional information on the Company's accounting policies related to derivative instruments and hedging activities. The following table reflects the notional amount and fair value of derivative instruments included on the Company’s Unaudited Condensed Consolidated Balance Sheets on a gross basis.
		September 30, 2014												December 31, 2013
						Fair Value												Fair Value
		Notional Amount				Derivative Assets (1)				Derivative Liabilities (2)				Notional Amount				Derivative Assets (1)		Derivative Liabilities (2)
		(In Thousands)
	Derivatives designated as hedging instruments:
	Fair value hedges:
	Interest rate swaps related to long-term debt	$	1,423,950			$	62,272			$	164			$	423,950			$	67,623	$	—
	Total fair value hedges					62,272				164								67,623		—
	Cash flow hedges:
	Interest rate contracts:
	Swaps related to commercial loans	600,000				2,234				2,116				200,000				3,652		—
	Swaps related to FHLB advances	320,000				—				12,071				320,000				—		11,862
	Total cash flow hedges					2,234				14,187								3,652		11,862
	Total derivatives designated as hedging instruments					$	64,506			$	14,351							$	71,275	$	11,862
	Free-standing derivatives not designated as hedging instruments:
	Free-standing derivative instruments-risk management and other purposes:
	Interest rate contracts:
	Forward and option contracts related to held for sale mortgages	$	270,600			$	97			$	795			$	171,364			$	1,727	$	56
	Equity contracts:
	Purchased equity option related to equity-linked CDs	778,355				72,561				—				588,377				47,875		—
	Swap associated with sale of Visa, Inc. Class B shares	46,705				—				1,168				49,748				—		1,244
	Foreign exchange contracts:
	Forwards related to commercial loans	669,410				9,372				225				424,797				1,072		2,690
	Spots related to commercial loans	41,702				1				133				41,133				55		56
	Total free-standing derivative instruments-risk management and other purposes					$	82,031			$	2,321							$	50,729	$	4,046
	Free-standing derivative instruments – customer accommodation:
	Futures contracts (3)	$	427,000			$	—			$	—			$	657,000			$	—	$	—
	Interest rate lock commitments	226,010				2,981				2				129,791				947		57
	Written equity option related to equity-linked CDs	754,859				—				70,894				576,196				—		46,573
	Trading account assets and liabilities:
	Interest rate contracts for customers	15,946,776				247,415				188,608				13,474,347				262,578		200,899
	Commodity contracts for customers	453,899				10,990				9,692				906,650				23,132		18,373
	Foreign exchange contracts for customers	356,217				4,952				4,266				145,175				4,450		3,894
	Total trading account assets and liabilities					263,357				202,566								290,160		223,166
	Total free-standing derivative instruments- customer accommodations					$	266,338			$	273,462							$	291,107	$	269,796
	-1	Derivative assets, except for trading account assets that are recorded as a component of trading account assets on the Company's Unaudited Condensed Consolidated Balance Sheets, are recorded in other assets on the Company’s Unaudited Condensed Consolidated Balance Sheets.
	-2	Derivative liabilities are recorded in accrued expenses and other liabilities on the Company’s Unaudited Condensed Consolidated Balance Sheets.
	-3	Changes in fair value are cash settled daily; therefore, there is no ending balance at any given reporting period.
	Hedging Derivatives
	The Company uses derivative instruments to manage the risk of earnings fluctuations caused by interest rate volatility. For those financial instruments that qualify and are designated as a hedging relationship, either a fair value hedge or cash flow hedge, the effect of interest rate movements on the hedged assets or liabilities will generally be offset by the derivative instrument.
	Fair Value Hedges
	The Company enters into fair value hedging relationships using interest rate swaps to mitigate the Company’s exposure to losses in value as interest rates change. Derivative instruments that are used as part of the Company’s interest rate risk management strategy include interest rate swaps that relate to the pricing of specific balance sheet assets and liabilities. Interest rate swaps generally involve the exchange of fixed and variable rate interest payments between two parties, based on a common notional principal amount and maturity date.
	Interest rate swaps are used to convert the Company’s fixed rate long-term debt to a variable rate. The critical terms of the interest rate swaps match the terms of the corresponding hedged items. All components of each derivative instrument’s gain or loss are included in the assessment of hedge effectiveness.
	The Company recognized no gains or losses for the three and nine months ended September 30, 2014 and 2013 related to hedged firm commitments no longer qualifying as a fair value hedge. At September 30, 2014, the fair value hedges had a weighted average expected remaining term of 4.3 years.
	During the nine months ended September 30, 2013, the Company partially extinguished $126 million in aggregate principal amount of subordinated debentures. In connection with this extinguishment, the Company unwound $126 million of swaps associated with this issuance and recognized a proportional amount of the swap gains related to the terminated swaps as a component of gain on prepayment of FHLB and other borrowings in the Company's Unaudited Condensed Consolidated Statements of Income for the nine months ended September 30, 2013.
	The following table reflects the change in fair value for interest rate contracts and the related hedged items as well as other gains and losses related to fair value hedges including gains or losses recognized because of hedge ineffectiveness.
				Gain (Loss) for the
		Condensed Consolidated		Three Months Ended September 30,								Nine Months Ended September 30,
		Statements of Income Caption		2014				2013				2014				2013
				(In Thousands)
	Change in fair value of interest rate contracts:
	Interest rate swaps hedging long term debt	Interest on FHLB and other borrowings		$	(5,391	)		$	(2,271	)		$	(5,515	)		$	(29,995	)
	Hedged long term debt	Interest on FHLB and other borrowings		4,829				2,748				5,048				30,792
	Other gains on interest rate contracts:
	Interest and amortization related to interest rate swaps on hedged long term debt	Interest on FHLB and other borrowings		6,081				5,209				18,114				17,550
	There were no material fair value hedging gains or losses recognized because of hedge ineffectiveness for the three and nine months ended September 30, 2014 and 2013.
	Cash Flow Hedges
	The Company enters into cash flow hedging relationships using interest rate swaps and options, such as caps and floors, to mitigate exposure to the variability in future cash flows or other forecasted transactions associated with its floating rate assets and liabilities. The Company uses interest rate swaps and options to hedge the repricing characteristics of its floating rate commercial loans and FHLB advances. All components of each derivative instrument’s gain or loss are included in the assessment of hedge effectiveness. The initial assessment of expected hedge effectiveness is based on regression analysis. The ongoing periodic measures of hedge ineffectiveness are based on the expected change in cash flows of the hedged item caused by changes in the benchmark interest rate. There were no material cash flow hedging gains or losses recognized because of hedge ineffectiveness for the three and nine months ended September 30, 2014 and 2013. There were no gains or losses reclassified from other comprehensive income (loss) because of the discontinuance of cash flow hedges related to certain forecasted transactions that are probable of not occurring for the three and nine months ended September 30, 2014 and 2013.
	At September 30, 2014, cash flow hedges not terminated had a net fair value of $(12.0) million and a weighted average life of 3.1 years. Based on the current interest rate environment, $2.2 million of losses are expected to be reclassified to net interest income over the next 12 months as net settlements occur. The maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions is 6.8 years.
	The following table presents the effect of derivative instruments designated and qualifying as cash flow hedges on the Company’s Unaudited Condensed Consolidated Balance Sheets and the Company’s Unaudited Condensed Consolidated Statements of Income.
		Gain (Loss) for the
	Three Months Ended								Nine Months Ended
	September 30,								September 30,
	2014				2013				2014				2013
	(In Thousands)
Interest rate contracts:
Net change in amount recognized in other comprehensive income	$	(706	)		$	226			$	(2,388	)		$	6,491
Amount reclassified from accumulated other comprehensive income into net interest income	(41		)		(1,524		)		(1,768		)		(3,800		)
Amount of ineffectiveness recognized in net interest income	—				—				—				—
Derivatives Not Designated As Hedges
Derivatives not designated as hedges include those that are entered into as either economic hedges as part of the Company’s overall risk management strategy or to facilitate client needs. Economic hedges are those that do not qualify to be treated as a fair value hedge, cash flow hedge or foreign currency hedge for accounting purposes, but are necessary to economically manage the risk exposure associated with the assets and liabilities of the Company.
The Company also enters into a variety of interest rate contracts, commodity contracts and foreign exchange contracts in its trading activities. The primary purpose for using these derivative instruments in the trading account is to facilitate customer transactions. The trading interest rate contract portfolio is actively managed and hedged with similar products to limit market value risk of the portfolio. Changes in the estimated fair value of contracts in the trading account along with the related interest settlements on the contracts are recorded in noninterest income as corporate and correspondent investment sales in the Company's Unaudited Condensed Consolidated Statements of Income.
Free-Standing Derivative Instruments – Risk Management and Other Purposes
The Company enters into forward contracts to economically hedge the change in fair value of certain residential mortgage loans held for sale due to changes in interest rates. Revaluation gains and losses from free-standing derivatives related to mortgage banking activity are recorded as a component of mortgage banking income in the Company’s Unaudited Condensed Consolidated Statements of Income.
In conjunction with the sale of its Visa, Inc. Class B shares in 2009, the Company entered into a total return swap in which the Company will make or receive payments based on subsequent changes in the conversion rate of the Class B shares into Class A shares. This total return swap is accounted for as a free-standing derivative.
The Company offers its customers equity-linked CDs that have a return linked to individual equities and equity indices. Under appropriate accounting guidance, a CD that pays interest based on changes in an equity index is a hybrid instrument that requires separation into a host contract (the CD) and an embedded derivative contract (written equity call option). The Company has entered into an offsetting derivative contract in order to economically hedge the exposure related to the issuance of equity-linked CDs. Both the embedded derivative and derivative contract entered into by the Company are recorded at fair value with offsetting gains and losses recognized within noninterest expense in the Company's Unaudited Condensed Consolidated Statements of Income. The embedded derivative is classified as a free-standing derivative instrument to accommodate customers while the offsetting derivative contract intended to hedge the Company’s exposure is classified as a free-standing derivative instrument for risk management and other purposes.
The Company also enters into foreign currency contracts to hedge its exposure to fluctuations in foreign currency exchange rates due to its funding of commercial loans in foreign currencies.
The net gains and losses recorded in the Company's Unaudited Condensed Consolidated Statements of Income from free-standing derivative instruments used for risk management and other purposes are summarized in the following table.
			Gain (Loss) for the
	Condensed Consolidated		Three Months Ended September 30,								Nine Months Ended September 30,
	Statements of Income Caption		2014				2013				2014				2013
			(In Thousands)
Interest rate contracts:
Forward & option contracts related to residential mortgage loans held for sale	Mortgage banking income		$	1,558			$	(17,705	)		$	(2,549	)		$	(4,961	)
Equity contracts:
Purchased equity option related to equity-linked CDs	Other expense		17,979				6,527				24,686				11,769
Foreign currency contracts:
Forward contracts related to commercial loans	Other income		44,452				(15,721		)		27,022				(4,700		)
Spot contracts related to commercial loans	Other income		(4,459		)		1,683				(1,052		)		878
Free-Standing Derivative Instruments – Customer Accommodation
The majority of free-standing derivative instruments the Company enters into are for the benefit of its commercial customers. These derivative contracts are not designated against specific assets or liabilities on the Company's Unaudited Condensed Consolidated Balance Sheets or to forecasted transactions and, therefore, do not qualify for hedge accounting. The Company may economically hedge significant exposures related to these derivative contracts entered into for the benefit of customers by entering into offsetting contracts with high-quality counterparties with substantially matching terms. Revaluation gains and losses on commodity and other commercial customer derivative contracts are recorded as a component of corporate and correspondent investment sales in the Company's Unaudited Condensed Consolidated Statements of Income.
Interest rate lock commitments issued on residential mortgage loan commitments that will be held for resale are also considered free-standing derivative instruments, and the interest rate exposure on these commitments is economically hedged primarily with forward contracts. Revaluation gains and losses from free-standing derivatives related to mortgage banking activity are recorded as a component of mortgage banking income in the Company's Unaudited Condensed Consolidated Statements of Income.
The net gains and losses recorded in the Company's Unaudited Condensed Consolidated Statements of Income relating to free-standing derivative instruments used as a customer accommodation are summarized in the following table.
			Gain (Loss) for the
	Condensed Consolidated		Three Months Ended September 30,								Nine Months Ended September 30,
	Statements of Income Caption		2014				2013				2014				2013
			(In Thousands)
Futures contracts	Corporate and correspondent investment sales		$	87			$	(339	)		$	(146	)		$	278
Interest rate contracts:
Interest rate contracts for customers	Corporate and correspondent investment sales		4,800				5,944				13,958				22,252
Interest rate lock commitments	Mortgage banking income		(842		)		3,289				2,089				(1,194		)
Commodity contracts:
Commodity contracts for customers	Corporate and correspondent investment sales		191				(6		)		94				20
Foreign currency contracts:
Foreign currency exchange contracts for customers	Corporate and correspondent investment sales		309				63				679				346
Equity contracts:
Written equity option related to equity-linked CDs	Other expense		(17,777		)		(6,482		)		(24,321		)		(11,637		)
Derivatives Credit and Market Risks
By using derivative instruments, the Company is exposed to credit and market risk. If the counterparty fails to perform, credit risk is equal to the extent of the Company’s fair value gain in a derivative. When the fair value of a derivative instrument contract is positive, this generally indicates that the counterparty owes the Company and, therefore, creates a credit risk for the Company. When the fair value of a derivative instrument contract is negative, the Company owes the counterparty and, therefore, it has no credit risk. The Company minimizes the credit risk in derivative instruments by entering into transactions with high-quality counterparties that are reviewed periodically. Credit losses are also mitigated through collateral agreements and other contract provisions with derivative counterparties.
Market risk is the adverse effect that a change in interest rates or implied volatility rates has on the value of a financial instrument. The Company manages the market risk associated with interest rate contracts by establishing and monitoring limits as to the types and degree of risk that may be undertaken.
The Company’s derivatives activities are monitored by its Asset/Liability Committee as part of its risk-management oversight. The Company’s Asset/Liability Committee is responsible for mandating various hedging strategies that are developed through its analysis of data from financial simulation models and other internal and industry sources. The resulting hedging strategies are then incorporated into the Company’s overall interest rate risk management and trading strategies.
Entering into interest rate swap agreements and options involves not only the risk of dealing with counterparties and their ability to meet the terms of the contracts but also interest rate risk associated with unmatched positions. At September 30, 2014, interest rate swap agreements and options classified as trading were substantially matched. The Company had credit risk of $263 million related to derivative instruments in the trading account portfolio, which does not take into consideration master netting arrangements or the value of the collateral. There were $125 thousand and $1.6 million in credit losses associated with derivative instruments classified as trading for the three months ended September 30, 2014 and 2013, respectively. There were $851 thousand and $3.3 million in credit losses associated with derivative instruments classified as trading for the nine months ended September 30, 2014 and 2013, respectively. At September 30, 2014, there were $72 thousand nonperforming derivative positions classified as trading and at December 31, 2013 there were $54 thousand nonperforming derivative positions classified as trading.
The Company’s derivative positions held for hedging purposes are primarily executed in the over-the-counter market. These positions at September 30, 2014 have credit risk of $74 million, which does not take into consideration master netting arrangements or the value of the collateral.
There were no credit losses associated with derivative instruments classified as nontrading for the three and nine months ended September 30, 2014 and 2013. At September 30, 2014 and December 31, 2013, there were no nonperforming derivative positions classified as nontrading.
As of September 30, 2014 and December 31, 2013, the Company had recorded the right to reclaim cash collateral of $32 million and $26 million, respectively, within other assets on the Company’s Unaudited Condensed Consolidated Balance Sheets and had recorded the obligation to return cash collateral of $60 million and $38 million, respectively, within deposits on the Company’s Unaudited Condensed Consolidated Balance Sheets.
Contingent Features
Certain of the Company’s derivative instruments contain provisions that require the Company’s debt to maintain a certain credit rating from each of the major credit rating agencies. If the Company’s debt were to fall below this rating, it would be in violation of these provisions, and the counterparties to the derivative instruments could demand immediate and ongoing full overnight collateralization on derivative instruments in net liability positions. The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position on September 30, 2014 was $55 million for which the Company has collateral requirements of $52 million in the normal course of business. If the credit risk-related contingent features underlying these agreements were triggered on September 30, 2014, the Company’s collateral requirements to its counterparties would increase by $4 million. The aggregate fair value of all derivative instruments with credit risk-related contingent features that were in a liability position on December 31, 2013 was $57 million for which the Company had collateral requirements of $54 million in the normal course of business. If the credit risk-related contingent features underlying these agreements were triggered on December 31, 2013, the Company’s collateral requirements to its counterparties would have increased by $3 million.

Assets_and_Liabilities_Subject

Assets and Liabilities Subject to Enforceable Master Netting Arrangements	9 Months Ended
	Sep. 30, 2014
Offsetting [Abstract]	'
Assets and Liabilities Subject to Enforceable Master Netting Arrangements	'
	Assets and Liabilities Subject to Enforceable Master Netting Arrangements
	Derivatives
	In conjunction with the derivative and hedging activity discussed in Note 6, Derivatives and Hedging, the Company is party to master netting arrangements with its financial institution counterparties for some of its derivative and hedging activities. The Company does not offset assets and liabilities under these master netting arrangements for financial statement presentation purposes. The master netting arrangements provide for single net settlement of all derivative instrument arrangements, as well as collateral, in the event of default, or termination of, any one contract with the respective counterparties. Cash collateral is usually posted by the counterparty with a net liability position in accordance with contract thresholds.
	Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase
	The Company enters into agreements under which it purchases/sells securities subject to an obligation to resell/repurchase the same or similar securities. Securities purchased under agreements to resell and securities sold under agreements to repurchase are generally accounted for as collateralized financing transactions and recorded at the amounts at which the securities were purchased/sold plus accrued interest. The securities pledged as collateral are generally U.S. government and federal agency securities.
	Securities purchased under agreements to resell and securities sold under agreements to repurchase are governed by a MRA. Under the terms of the MRA, all transactions between the Company and the counterparty constitute a single business relationship such that in the event of default, the nondefaulting party is entitled to set off claims and apply property held by that party in respect of any transaction against obligations owed. Any payments, deliveries, or other transfers may be applied against each other and netted. These amounts are limited to the contract asset/liability balance, and accordingly, do not include excess collateral received/pledged. The Company offsets the assets and liabilities under netting arrangements for the balance sheet presentation of securities purchased under agreements to resell and securities sold under agreements to repurchase provided certain criteria are met that permit balance sheet netting. As of December 31, 2013, the Company had no repurchase agreements that were subject to enforceable master netting arrangements.
	The following represents the Company’s assets/liabilities subject to an enforceable master netting arrangement. The derivative instruments the Company has with its customers are not subject to an enforceable master netting arrangement.
								Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets
		Gross Amounts Recognized		Gross Amounts Offset in the Condensed Consolidated Balance Sheets		Net Amount Presented in the Condensed Consolidated Balance Sheets		Financial Instruments (1)		Cash Collateral Received/ Pledged (1)		Net Amount
		(In Thousands)
	September 30, 2014
	Securities purchased under agreements to resell:
	Subject to a master netting arrangement	$	248,622	$	—	$	248,622	$	248,508	$	—	$	114
	Derivative financial assets:
	Subject to a master netting arrangement	$	203,951	$	—	$	203,951	$	17,855	$	54,358	$	131,738
	Not subject to a master netting arrangement	208,924		—		208,924		—		—		208,924
	Total derivative financial assets	$	412,875	$	—	$	412,875	$	17,855	$	54,358	$	340,662
	Securities sold under agreements to repurchase:
	Subject to a master netting arrangement	$	219,973	$	—	$	219,973	$	219,850	$	—	$	123
	Derivative financial liabilities:
	Subject to a master netting arrangement	$	197,979	$	—	$	197,979	$	34,626	$	29,058	$	134,295
	Not subject to a master netting arrangement	92,155		—		92,155		—		—		92,155
	Total derivative financial liabilities	$	290,134	$	—	$	290,134	$	34,626	$	29,058	$	226,450
	December 31, 2013
	Derivative financial assets:
	Subject to a master netting arrangement	$	192,771	$	—	$	192,771	$	7,723	$	37,189	$	147,859
	Not subject to a master netting arrangement	220,340		—		220,340		—		—		220,340
	Total derivative financial assets	$	413,111	$	—	$	413,111	$	7,723	$	37,189	$	368,199
	Derivative financial liabilities:
	Subject to a master netting arrangement	$	200,207	$	—	$	200,207	$	46,466	$	25,910	$	127,831
	Not subject to a master netting arrangement	85,497		—		85,497		—		—		85,497
	Total derivative financial liabilities	$	285,704	$	—	$	285,704	$	46,466	$	25,910	$	213,328
	-1	The actual amount of collateral received/pledged is limited to the asset/liability balance and does not include excess collateral received/pledged. When excess collateral exists the collateral shown in the table above has been allocated based on the percentage of the actual amount of collateral posted.

Commitments_Contingencies_and_

Commitments, Contingencies and Guarantees	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments, Contingencies and Guarantees	'
	Commitments, Contingencies and Guarantees
	Commitments to Extend Credit & Standby and Commercial Letters of Credit
	The following represents the Company’s commitments to extend credit, standby letters of credit and commercial letters of credit:
		September 30, 2014		December 31, 2013
		(In Thousands)
	Commitments to extend credit	$	27,313,485	$	26,545,608
	Standby and commercial letters of credit	1,971,051		2,093,159
	Commitments to extend credit are agreements to lend to customers as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements.
	Standby and commercial letters of credit are commitments issued by the Company to guarantee the performance of a customer to a third party. These guarantees are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing and similar transactions, and expire in decreasing amounts with terms ranging from one to four years.
	The credit risk involved in issuing letters of credit and commitments is essentially the same as that involved in extending loan facilities to customers. The fair value of the letters of credit and commitments typically approximates the fee received from the customer for issuing such commitments. These fees are deferred and are recognized over the commitment period. At September 30, 2014 and December 31, 2013, the recorded amount of these deferred fees was $6.1 million and $4.9 million, respectively. The Company holds various assets as collateral supporting those commitments for which collateral is deemed necessary. At September 30, 2014, the maximum potential amount of future undiscounted payments the Company could be required to make under outstanding standby letters of credit was $2.0 billion. At September 30, 2014 and December 31, 2013, the Company had reserves related to letters of credit and unfunded commitments recorded in accrued expenses and other liabilities on the Company’s Unaudited Condensed Consolidated Balance Sheet of $91 million and $76 million, respectively.
	Loan Sale Recourse
	The Company has potential recourse related to FNMA securitizations. At both September 30, 2014 and December 31, 2013, the amount of potential recourse was $20 million, of which the Company had reserved $626 thousand and $738 thousand, respectively, which is recorded in accrued expenses and other liabilities on the Company's Unaudited Condensed Consolidated Balance Sheets for the respective periods.
	The Company also issues standard representations and warranties related to mortgage loan sales to government-sponsored agencies. Although these agreements often do not specify limitations, the Company does not believe that any payments related to these representations and warranties would materially change the financial condition or results of operations of the Company. At September 30, 2014 and December 31, 2013, the Company recorded $1 million of reserves in accrued expenses and other liabilities on the Company’s Unaudited Condensed Consolidated Balance Sheets related to potential losses from loans sold.
	Loss Sharing Agreement
	In connection with the Guaranty Bank acquisition, the Bank entered into loss sharing agreements with the FDIC that covered approximately $9.7 billion of loans and OREO, excluding the impact of purchase accounting adjustments. In accordance with the terms of the loss sharing agreements, the FDIC’s obligation to reimburse the Bank for losses with respect to the acquired loans and acquired OREO begins with the first dollar of incurred losses, as defined in the loss sharing agreements. The terms of the loss sharing agreements provide that the FDIC will reimburse the Bank for 80% of incurred losses up to $2.3 billion and 95% of incurred losses in excess of $2.3 billion. Gains and recoveries on covered assets offset incurred losses, or are paid to the FDIC, at the applicable loss share percentage at the time of recovery. The loss sharing agreements provide for FDIC loss sharing for five years for commercial loans and 10 years for single family residential loans. The loss sharing agreement for commercial loans expires in the fourth quarter of 2014.
	The provisions of the loss sharing agreements may also require a payment by the Bank to the FDIC on October 15, 2019. On that date, the Bank is required to pay the FDIC 60% of the excess, if any, of (i) $457 million over (ii) the sum of (a) 25% of the total net amounts paid to the Bank under both of the loss share agreements plus (b) 20% of the deemed total cost to the Bank of administering the covered assets under the loss sharing agreements. The deemed total cost to the Bank of administering the covered assets is the sum of 2% of the average of the principal amount of covered assets based on the beginning and end of year balances for each of the 10 years during which the loss sharing agreements are in effect. At September 30, 2014 and December 31, 2013, the Company estimated the potential amount of payment due to the FDIC in 2019, at the end of the loss sharing agreements, to be $144 million and $140 million, respectively. The ultimate settlement amount of this payment due to the FDIC is dependent upon the performance of the underlying covered assets, the passage of time and actual claims submitted to the FDIC.
	Legal and Regulatory Proceedings
	In the ordinary course of business, the Company is subject to legal proceedings, including claims, litigation, investigations and administrative proceedings, all of which are considered incidental to the normal conduct of business. The Company believes it has substantial defenses to the claims asserted against it in its currently outstanding legal proceedings and, with respect to such legal proceedings, intends to continue to defend itself vigorously against such legal proceedings.
	Set forth below are descriptions of certain of the Company’s legal proceedings.
	In November 2012, the Company was named as a defendant in a putative class action lawsuit filed in the Superior Court of the State of California, County of Alameda, Cheryl Deaver, on behalf of herself and others so situated v. Compass Bank, wherein the plaintiff alleges the Company failed to provide lawful meal periods or wages in lieu thereof, full compensation for hours worked, or timely wages due at termination (the plaintiff had previously filed a similar lawsuit in May 2011 which was dismissed without prejudice when the plaintiff failed to meet certain filing deadlines). The plaintiff further alleges that the Company did not comply with wage statement requirements. The plaintiff seeks unspecified monetary relief. The Company believes there are substantial defenses to these claims and intends to defend them vigorously.
	In June 2013, the Company was named as a defendant in a lawsuit filed in the United States District Court of the Northern District of Alabama, Intellectual Ventures II, LLC v. BBVA Compass Bancshares, Inc. and BBVA Compass, wherein the plaintiff alleges the Company is infringing five patents owned by the plaintiff and related to the security infrastructure for the Company's online banking services. The plaintiff seeks unspecified monetary relief. The Company believes there are substantial defenses to these claims and intends to defend them vigorously.
	In March 2014, the Company was named as a defendant in a lawsuit filed in the Circuit Court of the Fourth Judicial Circuit in Duval County, Florida, Jack C. Demetree, et al. v. BBVA Compass, wherein the plaintiffs allege that their accountant stole approximately $16.4 million through unauthorized transactions on their accounts from 2006 to 2013. The plaintiffs seek unspecified monetary relief. The Company believes there are substantial defenses to these claims and intends to defend them vigorously.
	The Company (including the Bank) is or may become involved from time to time in information gathering requests, reviews, investigations and proceedings (both formal and informal) by various governmental regulatory agencies, law enforcement authorities and self-regulatory bodies regarding the Company’s business. Such matters could develop into administrative, civil, or criminal proceedings or enforcement actions and may result in material adverse consequences, including without limitation adverse judgments, settlements, fines, penalties, orders, injunctions, alterations in the Company’s business practices or other actions, and could result in additional expenses and collateral costs, including reputational damage, which could have a material adverse impact on the Company’s business, consolidated financial position, results of operations or cash flows.
	The Company owns all of the outstanding stock of BSI, a registered broker-dealer. Applicable law limits BSI from deriving more than 25 percent of its gross revenues from underwriting or dealing in bank-ineligible securities (“ineligible revenue”). Prior to the contribution of BSI to the Company in April 2013, BSI’s ineligible revenues in certain periods exceeded the 25 percent limit. It is possible that the Federal Reserve Board may take either formal or informal enforcement action against BSI and the Company and the possibility of civil money penalties cannot be ruled out. At this time, the Company does not know the amount of a potential civil money penalty, if any.
	There are other litigation matters that arise in the normal course of business. The Company assesses its liabilities and contingencies in connection with outstanding legal proceedings utilizing the latest information available. Where it is probable that the Company will incur a loss and the amount of the loss can be reasonably estimated, the Company records a liability in its consolidated financial statements. These legal reserves may be increased or decreased to reflect any relevant developments. Where a loss is not probable or the amount of loss is not estimable, the Company does not accrue legal reserves. At September 30, 2014, the Company had accrued legal reserves in the amount of $10 million. Additionally, for those matters where a loss is both estimable and reasonably possible, the Company estimates losses that it could incur beyond the accrued legal reserves. Under U.S. GAAP, an event is "reasonably possible" if "the chance of the future event or events occurring is more than remote but less than likely" and an event is "remote" if "the chance of the future event or events occurring is slight." At September 30, 2014, there were no such matters where the Company determined a loss was both estimable and reasonably possible beyond the accrued legal reserve.
	While the outcome of legal proceedings and the timing of the ultimate resolution are inherently difficult to predict, based on information currently available, advice of counsel and available insurance coverage, the Company believes that it has established adequate legal reserves. Further, based upon available information, the Company is of the opinion that these legal proceedings, individually or in the aggregate, will not have a material adverse effect on the Company’s financial condition or results of operations. However, in the event of unexpected future developments, it is possible that the ultimate resolution of those matters, if unfavorable, may be material to the Company’s results of operations for any particular period, depending, in part, upon the size of the loss or liability imposed and the operating results for the applicable period.
	Income Tax Review
	The Company is subject to review and examination from various tax authorities. The Company is currently under examination by the IRS and a number of states, and has received notices of proposed adjustments related to federal and state income taxes due for prior years. Management believes that adequate provisions for income taxes have been recorded.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	The Company applies the fair value accounting guidance required under ASC Topic 820 which establishes a framework for measuring fair value. This guidance defines fair value as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. This guidance also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within this fair value hierarchy is based upon the lowest level of input that is significant to the instrument’s fair value measurement. The three levels within the fair value hierarchy are described as follows.
	•	Level 1 – Fair value is based on quoted prices in an active market for identical assets or liabilities.
	•	Level 2 – Fair value is based on quoted market prices for similar instruments traded in active markets, quoted prices for identical or similar instruments in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market.
	•	Level 3 – Fair value is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities would include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar pricing techniques based on the Company’s own assumptions about what market participants would use to price the asset or liability.
	A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments under the fair value hierarchy, is set forth below. These valuation methodologies were applied to the Company’s financial assets and financial liabilities carried at fair value. In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use observable market based parameters as inputs. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as other unobservable parameters. Any such valuation adjustments are applied consistently over time. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. The Company’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, the reported fair value amounts have not been comprehensively revalued since the presentation dates, and, therefore, estimates of fair value after the balance sheet date may differ significantly from the amounts presented herein.
	Financial Instruments Measured at Fair Value on a Recurring Basis
	Trading account assets and liabilities, securities available for sale, certain mortgage loans held for sale, derivative assets and liabilities, and mortgage servicing rights are recorded at fair value on a recurring basis. The following is a description of the valuation methodologies for these assets and liabilities.
	Trading account assets and liabilities and investment securities available for sale – Trading account assets and liabilities and investment securities available for sale consist of U.S. Treasury and other U.S. government agencies securities, mortgage-backed securities, collateralized mortgage obligations, debt obligations of state and political subdivisions, other debt and equity securities, and derivative contracts.
	•	U.S. Treasury and other U.S. government agencies securities are valued based on quoted market prices of identical assets on active exchanges (Level 1 measurements) or are valued based on a market approach using observable inputs such as benchmark yields, reported trades, broker/dealer quotes, benchmark securities, and bids/offers of government-sponsored enterprise securities (Level 2 measurements).
	•	Mortgage-backed securities are primarily valued using market-based pricing matrices that are based on observable inputs including benchmark To Be Announced security prices, U.S. Treasury yields, U.S. dollar swap yields, and benchmark floating-rate indices. Mortgage-backed securities pricing may also give consideration to pool-specific data such as prepayment history and collateral characteristics. Valuations for mortgage-backed securities are therefore classified as Level 2 measurements.
	•	Collateralized mortgage obligations are valued using market-based pricing matrices that are based on observable inputs including reported trades, bids, offers, dealer quotes, U.S. Treasury yields, U.S. dollar swap yields, market convention prepayment speeds, tranche-specific characteristics, prepayment history, and collateral characteristics. Fair value measurements for collateralized mortgage obligations are classified as Level 2.
	•	Debt obligations of states and political subdivisions are primarily valued using market-based pricing matrices that are based on observable inputs including Municipal Securities Rulemaking Board reported trades, issuer spreads, material event notices, and benchmark yield curves. These valuations are Level 2 measurements.
	•	Other debt and equity securities consist of mutual funds, foreign and corporate debt, and U.S. government agencies equity securities. Mutual funds are valued based on quoted market prices of identical assets trading on active exchanges. These valuations are Level 1 measurements. Foreign and corporate debt valuations are based on information and assumptions that are observable in the market place. The valuations for these securities are therefore classified as Level 2. U.S. government agency equity securities are valued based on quoted market prices of identical assets trading on active exchanges. These valuations thus qualify as Level 1 measurements.
	•	Other derivative assets and liabilities consist primarily of interest rate and commodity contracts. The Company’s interest rate contracts are valued utilizing Level 2 observable inputs (yield curves and volatilities) to determine a current market price for each interest rate contract. Commodity contracts are priced using raw market data, primarily in the form of quotes for fixed and basis swaps with monthly, quarterly, seasonal or calendar-year terms. Proprietary models provided by a third party are used to generate forward curves and volatility surfaces. As a result of the valuation process and observable inputs used, commodity contracts are classified as Level 2 measurements. To validate the reasonableness of these calculations, management compares the assumptions with market information.
	•	Other trading assets primarily consist of interest-only strips which are valued by an independent third-party. The independent third-party values the assets on a loan-by-loan basis using a discounted cash flow analysis that employs prepayment assumptions, discount rate assumptions, and default curves. The prepayment assumptions are created from actual SBA pool prepayment history. The discount rates are derived from actual SBA loan secondary market transactions. The default curves are created using historical observable and unobservable inputs. As such, interest-only strips are classified as Level 3 measurements. The Company’s SBA department is responsible for ensuring the appropriate application of the valuation, capitalization, and amortization policies of the Company’s interest-only strips. The department performs independent, internal valuations of the interest-only strips on a quarterly basis, which are then reconciled to the third-party valuations to ensure their validity.
	Loans held for sale – The Company has elected to apply the fair value option for single family real estate mortgage loans originated for resale in the secondary market. The election allows for a more effective offset of the changes in fair values of the loans and the derivative instruments used to economically hedge them without the burden of complying with the requirements for hedge accounting. The Company has not elected the fair value option for other loans held for sale primarily because they are not economically hedged using derivative instruments.
	The fair value of loans held for sale is based on what secondary markets are currently offering for portfolios with similar characteristics. The changes in fair value of these assets are largely driven by changes in interest rates subsequent to loan funding and changes in the fair value of servicing associated with the mortgage loan held for sale. Both the mortgage loans held for sale and the related forward contracts are classified as Level 2.
	At both September 30, 2014 and December 31, 2013, no loans held for sale for which the fair value option was elected were 90 days or more past due or were in nonaccrual. Interest income on mortgage loans held for sale is recognized based on contractual rates and is reflected in interest and fees on loans in the Company's Unaudited Condensed Consolidated Statements of Income. Net gains (losses) of $(2.3) million and $7.6 million resulting from changes in fair value of these loans were recorded in noninterest income during the three months ended September 30, 2014 and 2013, respectively. Net gains (losses) of $3.8 million and $(8.1) million resulting from changes in fair value of these loans were recorded in noninterest income during the nine months ended September 30, 2014 and 2013, respectively.
	The Company also had fair value changes on forward contracts related to residential mortgage loans held for sale of approximately $1.8 million and $(17.7) million for the three months ended September 30, 2014 and 2013, respectively, and $(2.4) million and $(4.9) million for the nine months ended September 30, 2014 and 2013, respectively. An immaterial portion of these amounts was attributable to changes in instrument-specific credit risk.
	The following tables summarize the difference between the aggregate fair value and the aggregate unpaid principal balance for residential mortgage loans measured at fair value.
		Aggregate Fair Value			Aggregate Unpaid Principal Balance			Difference
		(In Thousands)
	September 30, 2014
	Residential mortgage loans held for sale	$	190,882		$	184,639		$	6,243
	December 31, 2013
	Residential mortgage loans held for sale	$	139,750		$	137,300		$	2,450
	Derivative assets and liabilities – Derivative assets and liabilities are measured using models that primarily use market observable inputs, such as quoted security prices, and are accordingly classified as Level 2. The derivative assets and liabilities classified within Level 3 of the fair value hierarchy were comprised of interest rate lock commitments that are valued using third-party software that calculates fair market value considering current quoted TBA and other market based prices and then applies closing ratio assumptions based on software-produced pull through ratios that are generated using the Company’s historical fallout activity. Based upon this process, the fair value measurement obtained for these financial instruments is deemed a Level 3 classification. The Company's Secondary Marketing Committee is responsible for the appropriate application of the valuation policies and procedures surrounding the Company’s interest rate lock commitments. Policies established to govern mortgage pipeline risk management activities must be approved by the Company’s Asset/Liability Committee on an annual basis.
	Other assets – Other assets measured at fair value on a recurring basis and classified within Level 3 of the fair value hierarchy were comprised of MSRs that are valued through a discounted cash flow analysis using a third-party commercial valuation system. The valuation takes into consideration the objective characteristics of the MSR portfolio, such as loan amount, note rate, service fee, loan term, and common industry assumptions, such as servicing costs, ancillary income, prepayment estimates, earning rates, cost of fund rates, discount rates, etc. The Company’s portfolio-specific factors are also considered in calculating the fair value of MSRs to the extent one can reasonably assume a buyer would also incorporate these factors. Examples of such factors are geographical concentrations of the portfolio, liquidity considerations such as housing authority loans which have a limited number of approved servicers, or additional views of risk not inherently accounted for in prepayment assumptions. Product liquidity and these other risks are generally incorporated through adjustment of discount factors applied to forecasted cash flows. Based on this method of pricing MSRs, the fair value measurement obtained for these financial instruments is deemed a Level 3 classification. The value of the MSR is calculated by a third-party firm that specializes in the MSR market and valuation services. Additionally, the Company obtains a valuation from an independent party to compare for reasonableness. The Company’s Secondary Marketing Committee is responsible for ensuring the appropriate application of valuation, capitalization, and fair value decay policies for the MSR portfolio. The Committee meets at least monthly to review the MSR portfolio.
	The following tables summarize the financial assets and liabilities measured at fair value on a recurring basis.
					Fair Value Measurements at the End of the Reporting Period Using
		Fair Value			Quoted Prices in Active Markets for Identical Assets			Significant Other Observable Inputs			Significant Unobservable Inputs
		September 30, 2014			(Level 1)			(Level 2)			(Level 3)
		(In Thousands)
	Recurring fair value measurements
	Assets:
	Trading account assets:
	U.S. Treasury and other U.S. government agencies	$	244,718		$	244,718		$	—		$	—
	Other debt securities	5,221			—			5,221			—
	Interest rate contracts	247,415			—			247,415			—
	Commodity contracts	10,990			—			10,990			—
	Foreign exchange contracts	4,952			—			4,952			—
	Other trading assets	1,840			—			121			1,719
	Total trading account assets	515,136			244,718			268,699			1,719
	Loans held for sale	190,882			—			190,882			—
	Investment securities available for sale:
	U.S. Treasury and other U.S. government agencies	1,213,581			433,680			779,901			—
	Mortgage-backed securities	4,694,399			—			4,694,399			—
	Collateralized mortgage obligations	2,415,510			—			2,415,510			—
	States and political subdivisions	488,787			—			488,787			—
	Other debt securities	29,127			29,127			—			—
	Equity securities (1)	59			53			—			6
	Total investment securities available for sale	8,841,463			462,860			8,378,597			6
	Derivative assets:
	Interest rate contracts	67,584			—			64,603			2,981
	Equity contracts	72,561			—			72,561			—
	Foreign exchange contracts	9,373			—			9,373			—
	Total derivative assets	149,518			—			146,537			2,981
	Other assets	34,892			—			—			34,892
	Liabilities:
	Trading account liabilities:
	U.S. Treasury and other U.S. government agencies	$	245,742		$	245,742		$	—		$	—
	Interest rate contracts	188,608			—			188,608			—
Commodity contracts	9,692			—			9,692			—
Foreign exchange contracts	4,266			—			4,266			—
Other debt securities	973			—			973			—
Other trading liabilities	120			—			120			—
Total trading account liabilities	449,401			245,742			203,659			—
Derivative liabilities:
Interest rate contracts	15,148			—			15,146			2
Equity contracts	70,894			—			70,894			—
Foreign exchange contracts	358			—			358			—
Total derivative liabilities	86,400			—			86,398			2
-1	Excludes $485 million of FHLB and Federal Reserve stock required to be owned by the Company at September 30, 2014. These securities are carried at par.
				Fair Value Measurements at the End of the Reporting Period Using
	Fair Value			Quoted Prices in Active Markets for Identical Assets			Significant Other Observable Inputs			Significant Unobservable Inputs
	December 31, 2013			(Level 1)			(Level 2)			(Level 3)
	(In Thousands)
Recurring fair value measurements
Assets:
Trading account assets:
U.S. Treasury and other U.S. government agencies	$	24,655		$	—		$	24,655		$	—
Mortgage-backed securities	1,285			—			1,285			—
State and political subdivisions	2,160			—			2,160			—
Other equity securities	2			—			2			—
Interest rate contracts	262,578			—			262,578			—
Commodity contracts	23,132			—			23,132			—
Foreign exchange contracts	4,450			—			4,450			—
Other trading assets	1,668			—			23			1,645
Total trading account assets	319,930			—			318,285			1,645
Loans held for sale	139,750			—			139,750			—
Investment securities available for sale:
U.S. Treasury and other U.S. government agencies	260,937			—			260,937			—
Mortgage-backed securities	5,233,791			—			5,233,791			—
Collateralized mortgage obligations	1,756,398			—			1,756,398			—
States and political subdivisions	509,436			—			509,436			—
Other debt securities	40,333			40,283			50			—
Equity securities (1)	63			57			—			6
Total investment securities available for sale	7,800,958			40,340			7,760,612			6
Derivative assets:
Interest rate contracts	73,949			—			73,002			947
Equity contracts	47,875			—			47,875			—
Foreign exchange contracts	1,127			—			1,127			—
Total derivative assets	122,951			—			122,004			947
Other assets	30,065			—			—			30,065
Liabilities:
Trading account liabilities:
Mortgage-backed securities	$	5,568		$	—		$	5,568		$	—
Interest rate contracts	200,899			—			200,899			—
Commodity contracts	18,373			—			18,373			—
Foreign exchange contracts	3,894			—			3,894			—
Other trading liabilities	23			—			23			—
Total trading account liabilities	228,757			—			228,757			—
Derivative liabilities:
Interest rate contracts	11,975			—			11,918			57
Equity contracts	46,573			—			46,573			—
Foreign exchange contracts	2,746			—			2,746			—
Total derivative liabilities	61,294			—			61,237			57
-1	Excludes $512 million of FHLB and Federal Reserve stock required to be owned by the Company at December 31, 2013. These securities are carried at par.
There were no transfers between Levels 1 or 2 of the fair value hierarchy for the three and nine months ended September 30, 2014 and 2013. It is the Company’s policy to value any transfers between levels of the fair value hierarchy based on end of period fair values.
The following table reconciles the assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Three Months Ended September 30,	Other Trading Assets			Equity Securities			Interest Rate Contracts, net			Other Assets
	(In Thousands)
Balance, July 1, 2013	$	1,962		$	6		$	533		$	22,623
Transfers into Level 3	—			—			—			—
Transfers out of Level 3	—			—			—			—
Total gains or losses (realized/unrealized):
Included in earnings (1)	(172		)	—			3,289			1,573
Included in other comprehensive income	—			—			—			—
Purchases, issuances, sales and settlements:
Purchases	—			—			—			—
Issuances	—			—			—			4,865
Sales	—			—			—			—
Settlements	—			—			—			—
Balance, September 30, 2013	$	1,790		$	6		$	3,822		$	29,061
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at September 30, 2013	$	(172	)	$	—		$	3,289		$	1,573
Balance, July 1, 2014	$	1,709		$	6		$	3,821		$	31,104
Transfers into Level 3	—			—			—			—
Transfers out of Level 3	—			—			—			—
Total gains or losses (realized/unrealized):
Included in earnings (1)	10			—			(842		)	(272		)
Included in other comprehensive income	—			—			—			—
Purchases, issuances, sales and settlements:
Purchases	—			—			—			—
Issuances	—			—			—			4,060
Sales	—			—			—			—
Settlements	—			—			—			—
Balance, September 30, 2014	$	1,719		$	6		$	2,979		$	34,892
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at September 30, 2014	$	10		$	—		$	(842	)	$	(272	)
-1	Included in noninterest income in the Unaudited Condensed Consolidated Statements of Income.
The following table reconciles the assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Nine Months Ended September 30,	Other Trading Assets			States and Political Subdivisions			Equity Securities			Interest Rate Contracts, net			Other Assets
	(In Thousands)
Balance, January 1, 2013	$	2,083		$	8		$	6		$	5,016		$	13,255
Transfers into Level 3	—			—			—			—			—
Transfers out of Level 3	—			—			—			—			—
Total gains or losses (realized/unrealized):
Included in earnings (1)	(293		)	—			—			(1,194		)	1,808
Included in other comprehensive income	—			—			—			—			—
Purchases, issuances, sales and settlements:
Purchases	—			—			—			—			—
Issuances	—			—			—			—			13,998
Sales	—			—			—			—			—
Settlements	—			(8		)	—			—			—
Balance, September 30, 2013	$	1,790		$	—		$	6		$	3,822		$	29,061
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at September 30, 2013	$	(293	)	$	—		$	—		$	(1,194	)	$	1,808
Balance, January 1, 2014	$	1,645		$	—		$	6		$	890		$	30,065
Transfers into Level 3	—			—			—			—			—
Transfers out of Level 3	—			—			—			—			—
Total gains or losses (realized/unrealized):
Included in earnings (1)	74			—			—			2,089			(3,239		)
Included in other comprehensive income	—			—			—			—			—
Purchases, issuances, sales and settlements:
Purchases	—			—			—			—			—
Issuances	—			—			—			—			8,066
Sales	—			—			—			—			—
Settlements	—			—			—			—			—
Balance, September 30, 2014	$	1,719		$	—		$	6		$	2,979		$	34,892
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at September 30, 2014	$	74		$	—		$	—		$	2,089		$	(3,239	)
-1	Included in noninterest income in the Unaudited Condensed Consolidated Statements of Income.
Assets Measured at Fair Value on a Nonrecurring Basis
Periodically, certain assets may be recorded at fair value on a non-recurring basis. These adjustments to fair value usually result from the application of lower of cost or fair value accounting or write-downs of individual assets due to impairment. The following table represents those assets that were subject to fair value adjustments during the three and nine months ended September 30, 2014 and 2013 and still held as of the end of the period, and the related gains and losses from fair value adjustments on assets sold during the period as well as assets still held as of the end of the period.
				Fair Value Measurements at the End of the Reporting Period Using
	Fair Value			Quoted Prices in Active Markets for Identical Assets			Significant Other Observable Inputs			Significant Unobservable Inputs			Total Gains (Losses)
	September 30, 2014			(Level 1)			(Level 2)			(Level 3)			Three Months Ended September 30, 2014			Nine Months Ended September 30, 2014
	(In Thousands)
Nonrecurring fair value measurements
Assets:
Investment securities held to maturity	$	3,832		$	—		$	—		$	3,832		$	—		$	(180	)
Impaired loans (1)	137,398			—			—			137,398			(2,362		)	(21,238		)
OREO	17,058			—			—			17,058			(758		)	(2,340		)
				Fair Value Measurements at the End of the Reporting Period Using
	Fair Value			Quoted Prices in Active Markets for Identical Assets			Significant Other Observable Inputs			Significant Unobservable Inputs			Total Gains (Losses)
	September 30, 2013			(Level 1)			(Level 2)			(Level 3)			Three Months Ended September 30, 2013			Nine Months Ended September 30, 2013
	(In Thousands)
Nonrecurring fair value measurements
Assets:
Investment securities held to maturity	$	2,793		$	—		$	—		$	2,793		$	(968	)	$	(1,430	)
Loans held for sale	7,465			—			—			7,465			—			182
Impaired loans (1)	160,659			—			—			160,659			(18,699		)	(36,872		)
OREO	41,493			—			—			41,493			(2,184		)	3,396
-1	Total gains (losses) represent charge-offs on impaired loans for which adjustments are based on the appraised value of the collateral.
The following is a description of the methodologies applied for valuing these assets:
Investment securities held to maturity – Nonrecurring fair value adjustments on investment securities held to maturity reflect impairment write-downs which the Company believes are other than temporary. For analyzing these securities, the Company has retained a third party valuation firm. Impairment is determined through the use of cash flow models that estimate cash flows on the underlying mortgages using security-specific collateral and the transaction structure. The cash flow models incorporate the remaining cash flows which are adjusted for future expected credit losses. Future expected credit losses are determined by using various assumptions such as current default rates, prepayment rates, and loss severities. The Company develops these assumptions through the use of market data published by third party sources in addition to historical analysis which includes actual delinquency and default information through the current period. The expected cash flows are then discounted at the interest rate used to recognize interest income on the security to arrive at a present value amount. As the fair value measurements are derived using a discounted cash flow modeling approach, the nonrecurring fair value measurements are classified as Level 3.
Loans held for sale – Loans held for sale for which the fair value option has not been elected are carried at the lower of cost or fair value and are evaluated on an individual basis. The fair value of each loan held for sale is based on the collateral value of the underlying asset. Therefore, loans held for sale subjected to nonrecurring fair value adjustments are classified as Level 3. There were no loans held for sale subjected to nonrecurring fair value measurements at September 30, 2014.
Impaired Loans – Impaired loans measured at fair value on a non-recurring basis represent the carrying value of impaired loans for which adjustments are based on the appraised value of the collateral. Nonrecurring fair value adjustments to impaired loans reflect full or partial write-downs that are generally based on the fair value of the underlying collateral supporting the loan. Loans subjected to nonrecurring fair value measurements based on the current estimated fair value of the collateral are classified as Level 3.
OREO – OREO is recorded on the Company's Unaudited Condensed Consolidated Balance Sheets at the lower of recorded balance or fair value, which is based on appraisals and third-party price opinions, less estimated costs to sell. The fair value is classified as Level 3.
The table below presents quantitative information about the significant unobservable inputs for material assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring and nonrecurring basis.
				Quantitative Information about Level 3 Fair Value Measurements
	Fair Value at						Range of Unobservable Inputs
	September 30, 2014			Valuation Technique		Unobservable Input(s)	(Weighted Average)
	(In Thousands)
Recurring fair value measurements:
Other trading assets	$	1,719		Discounted cash flow		Default rate	8.70%
						Prepayment rate	5.2% - 9.8% (6.9%)
Interest rate contracts	2,979			Discounted cash flow		Closing ratios (pull-through)	8.4% - 98.7% (52.4%)
						Cap grids	0.4% - 2.5% (1.0%)
Other assets - MSRs	34,892			Discounted cash flow		Discount rate	10.0% - 11.0% (10.1%)
						Constant prepayment rate or life speed	6.1% - 53.4% (10.0%)
						Cost to service	62.3% - 749.0% (66.0%)
Nonrecurring fair value measurements:
Investment securities held to maturity	$	3,832		Discounted cash flow		Prepayment rate	5.8% - 6.5% (6.2%)
						Default rate	8.0% - 9.2% (8.6%)
						Loss severity	51.3% - 93.0% (72.2%)
Impaired loans	137,398			Appraised value		Appraised value	0.0% - 100.0% (32.2%)
OREO	17,058			Appraised value		Appraised value	8.00%
The following provides a description of the sensitivity of the valuation technique to changes in unobservable inputs for recurring fair value measurements.
Recurring Fair Value Measurements Using Significant Unobservable Inputs
Other Trading Assets – Interest-Only Strips
Significant unobservable inputs used in the valuation of the Company’s interest-only strips include default rates and prepayment assumptions. Significant increases in either of these inputs in isolation would result in significantly lower fair value measurements. Generally, a change in the assumption used for the probability of default is accompanied by a directionally opposite change in the assumption used for prepayment rates.
Interest Rate Contracts - Interest Rate Lock Commitments
Significant unobservable inputs used in the valuation of interest rate lock commitments are pull-through and cap grids. Increases or decreases in the pull-through or cap grids will have a corresponding impact in the value of interest rate contracts.
Other Assets - MSRs
The significant unobservable inputs used in the fair value measurement of MSRs are discount rates, constant prepayment rate or life speed, and cost to service assumptions. The impact of prepayments and changes in the discount rate are based on a variety of underlying inputs. Increases or decreases to the underlying cash flow inputs will have a corresponding impact on the value of the MSR asset. The impact of the costs to service assumption will have a directionally opposite change in the fair value of the MSR asset.
Fair Value of Financial Instruments
The carrying amounts and estimated fair values, as well as the level within the fair value hierarchy, of the Company’s financial instruments are as follows:
	September 30, 2014
	Carrying Amount			Estimated Fair Value			Level 1			Level 2			Level 3
	(In Thousands)
Financial Instruments:
Assets:
Cash and cash equivalents	$	4,915,534		$	4,915,534		$	4,915,534		$	—		$	—
Trading account assets	515,136			515,136			244,718			268,699			1,719
Investment securities available for sale	9,326,413			9,326,413			462,860			8,378,597			484,956
Investment securities held to maturity	1,417,985			1,330,538			—			—			1,330,538
Loans held for sale	190,882			190,882			—			190,882			—
Loans, net	54,313,355			52,363,208			—			—			52,363,208
Derivative assets	149,518			149,518			—			146,537			2,981
Other assets	34,892			34,892			—			—			34,892
Liabilities:
Deposits	$	60,270,958		$	60,325,222		$	—		$	60,325,222		$	—
FHLB and other borrowings	4,551,050			4,529,351			—			4,529,351			—
Federal funds purchased and securities sold under agreements to repurchase	809,053			809,053			—			809,053			—
Other short-term borrowings	246,835			246,835			—			246,835			—
Trading account liabilities	449,401			449,401			245,742			203,659			—
Derivative liabilities	86,400			86,400			—			86,398			2
	December 31, 2013
	Carrying Amount			Estimated Fair Value			Level 1			Level 2			Level 3
	(In Thousands)
Financial Instruments:
Assets:
Cash and cash equivalents	$	3,598,460		$	3,598,460		$	3,598,460		$	—		$	—
Trading account assets	319,930			319,930			—			318,285			1,645
Investment securities available for sale	8,313,085			8,313,085			40,340			7,760,612			512,133
Investment securities held to maturity	1,519,196			1,405,258			—			—			1,405,258
Loans held for sale	147,109			147,109			—			139,750			7,359
Loans, net	49,966,297			47,822,339			—			—			47,822,339
Derivative assets	122,951			122,951			—			122,004			947
Other assets	30,065			30,065			—			—			30,065
Liabilities:
Deposits	$	54,437,490		$	54,492,651		$	—		$	54,492,651		$	—
FHLB and other borrowings	4,298,707			4,287,220			—			4,287,220			—
Federal funds purchased and securities sold under agreements to repurchase	852,570			852,570			—			852,570			—
Other short-term borrowings	5,591			5,591			—			5,591			—
Trading account liabilities	228,757			228,757			—			228,757			—
Derivative liabilities	61,294			61,294			—			61,237			57
The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments not carried at fair value:
Cash and cash equivalents: Cash and cash equivalents have maturities of three months or less. Accordingly, the carrying amount approximates fair value. Because these amounts generally relate to either currency or highly liquid assets, these are considered a Level 1 measurement.
Investment securities held to maturity: The fair values of securities held to maturity are estimated using a discounted cash flow approach. The discounted cash flow model uses inputs such as estimated prepayment speed, loss rates, and default rates. They are considered a Level 3 measurement as the valuation employs significant unobservable inputs.
Loans: Loans are presented net of the allowance for loan losses and are valued using discounted cash flows. The discount rates used to determine the present value of these loans are based on current market interest rates for loans with similar credit risk and term. They are considered a Level 3 measurement as the valuation employs significant unobservable inputs.
Deposits: The fair values of demand deposits are equal to the carrying amounts. Demand deposits include noninterest bearing demand deposits, savings accounts, NOW accounts and money market demand accounts. Discounted cash flows have been used to value fixed rate term deposits. The discount rate used is based on interest rates currently being offered by the Company on comparable deposits as to amount and term. They are considered a Level 2 measurement as the valuation primarily employs observable inputs for similar instruments.
Short-term borrowings: The carrying amounts of federal funds purchased, securities sold under agreements to repurchase and other short-term borrowings approximates fair value. They are therefore considered a Level 2 measurement.
FHLB and other borrowings: The fair value of the Company’s fixed rate borrowings, which includes the Company’s Capital Securities, are estimated using discounted cash flows, based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements. The carrying amount of the Company’s variable rate borrowings approximates fair value. As such, these borrowings are considered a Level 2 measurement as the valuation primarily employs observable inputs for similar instruments.

Comprehensive_Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Comprehensive Income	'
	Comprehensive Income
	Comprehensive income is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances arising from nonowner sources. The following summarizes the change in the components of other comprehensive income (loss).
		Three Months Ended September 30,
		2014												2013
		Pretax				Tax Expense/ (Benefit)				After-tax				Pretax				Tax Expense/ (Benefit)			After-tax
		(In Thousands)
	Other comprehensive income (loss):
	Unrealized holding gains (losses) arising during period from securities available for sale	$	(17,597	)		$	(6,325	)		$	(11,272	)		$	(12,546	)		$	(4,602	)	$	(7,944	)
	Less: reclassification adjustment for net gains on sale of securities in net income	9,710				3,490				6,220				—				—			—
	Net change in unrealized gains (losses) on securities available for sale	(27,307		)		(9,815		)		(17,492		)		(12,546		)		(4,602		)	(7,944		)
	Change in unamortized net holding losses on investment securities held to maturity	3,745				1,347				2,398				3,218				1,178			2,040
	Less: non-credit related impairment on investment securities held to maturity	—				—				—				—				—			—
	Change in unamortized non-credit related impairment on investment securities held to maturity	387				138				249				269				98			171
	Net change in unamortized holding losses on securities held to maturity	4,132				1,485				2,647				3,487				1,276			2,211
	Unrealized holding gains (losses) arising during period from cash flow hedge instruments	(1,103		)		(397		)		(706		)		356				130			226
	Change in defined benefit plans	—				—				—				1				—			1
	Other comprehensive income (loss)	$	(24,278	)		$	(8,727	)		$	(15,551	)		$	(8,702	)		$	(3,196	)	$	(5,506	)
		Nine Months Ended September 30,
		2014												2013
		Pretax				Tax Expense/ (Benefit)				After-tax				Pretax				Tax Expense/ (Benefit)			After-tax
		(In Thousands)
	Other comprehensive income (loss):
	Unrealized holding gains (losses) arising during period from securities available for sale	$	63,819			$	22,936			$	40,883			$	(158,157	)		$	(57,896	)	$	(100,261	)
	Less: reclassification adjustment for net gains on sale of securities in net income	47,608				17,110				30,498				33,030				12,089			20,941
	Net change in unrealized gains (losses) on securities available for sale	16,211				5,826				10,385				(191,187		)		(69,985		)	(121,202		)
	Change in unamortized net holding losses on investment securities held to maturity	11,213				4,030				7,183				12,753				4,668			8,085
	Less: non-credit related impairment on investment securities held to maturity	235				84				151				2,288				838			1,450
	Change in unamortized non-credit related impairment on investment securities held to maturity	1,141				409				732				1,982				725			1,257
	Net change in unamortized holding losses on securities held to maturity	12,119				4,355				7,764				12,447				4,555			7,892
	Unrealized holding gains (losses) arising during period from cash flow hedge instruments	(3,729		)		(1,341		)		(2,388		)		10,198				3,707			6,491
	Change in defined benefit plans	(2,672		)		(1,001		)		(1,671		)		1,018				337			681
	Other comprehensive income (loss)	$	21,929			$	7,839			$	14,090			$	(167,524	)		$	(61,386	)	$	(106,138	)
	Activity in accumulated other comprehensive income (loss), net of tax was as follows:
		Unrealized Gains (Losses) on Securities Available for Sale and Transferred to Held to Maturity				Accumulated (Gains) Losses on Cash Flow Hedging Instruments				Defined Benefit Plan Adjustment				Unamortized Impairment Losses on Investment Securities Held to Maturity				Total
		(In Thousands)
	Balance, January 1, 2013	$	86,379			$	(13,387	)		$	(38,243	)		$	(8,691	)		$	26,058
	Other comprehensive income (loss) before reclassifications	(100,261		)		4,072				—				(1,450		)		(97,639		)
	Amounts reclassified from accumulated other comprehensive income (loss)	(12,856		)		2,419				681				1,257				(8,499		)
	Net current period other comprehensive income (loss)	(113,117		)		6,491				681				(193		)		(106,138		)
	Balance, September 30, 2013	$	(26,738	)		$	(6,896	)		$	(37,562	)		$	(8,884	)		$	(80,080	)
	Balance, January 1, 2014	$	(31,490	)		$	(5,289	)		$	(41,921	)		$	(9,236	)		$	(87,936	)
	Other comprehensive income (loss) before reclassifications	40,883				(3,521		)		—				(151		)		37,211
	Amounts reclassified from accumulated other comprehensive income (loss)	(23,315		)		1,133				(1,671		)		732				(23,121		)
	Net current period other comprehensive income (loss)	17,568				(2,388		)		(1,671		)		581				14,090
	Balance, September 30, 2014	$	(13,922	)		$	(7,677	)		$	(43,592	)		$	(8,655	)		$	(73,846	)
	The following table presents information on reclassifications out of accumulated other comprehensive income.
	Details About Accumulated Other Comprehensive Income Components		Amounts Reclassified From Accumulated Other Comprehensive Income (1)																Condensed Consolidated Statement of Income Caption
			Three Months Ended September 30,								Nine Months Ended September 30,
			2014				2013				2014				2013
			(In Thousands)
	Unrealized Gains (Losses) on Securities Available for Sale and Transferred to Held to Maturity		$	9,710			$	—			$	47,608			$	33,030			Investment securities gains, net
			(3,745		)		(3,218		)		(11,213		)		(12,753		)		Interest on investment securities held to maturity
			5,965				(3,218		)		36,395				20,277
			(2,143		)		1,178				(13,080		)		(7,421		)		Income tax (expense) benefit
			$	3,822			$	(2,040	)		$	23,315			$	12,856			Net of tax
	Accumulated (Gains) Losses on Cash Flow Hedging Instruments		$	1,727			$	216			$	3,551			$	1,396			Interest and fees on loans
			(1,768		)		(1,740		)		(5,319		)		(5,196		)		Interest and fees on FHLB advances
			(41		)		(1,524		)		(1,768		)		(3,800		)
			15				554				635				1,381				Income tax benefit
			$	(26	)		$	(970	)		$	(1,133	)		$	(2,419	)		Net of tax
	Defined Benefit Plan Adjustment		$	—			$	—			$	2,672			$	(1,018	)		-2
			—				—				(1,001		)		337				Income tax (expense) benefit
			$	—			$	—			$	1,671			$	(681	)		Net of tax
Unamortized Impairment Losses on Investment Securities Held to Maturity		$	(387	)		$	(269	)		$	(1,141	)		$	(1,982	)		Interest on investment securities held to maturity
		138				98				409				725				Income tax benefit
		$	(249	)		$	(171	)		$	(732	)		$	(1,257	)		Net of tax
-1	Amounts in parentheses indicate debits to the consolidated statement of income.
-2	These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 18, Benefit Plans, in the Notes to the December 31, 2013, Consolidated Financial Statements for additional details).

Supplemental_Disclosure_for_St

Supplemental Disclosure for Statement of Cash Flows	9 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]	'
Supplemental Disclosure for Statement of Cash Flows	'
	Supplemental Disclosure for Statement of Cash Flows
	The following table presents the Company’s supplemental disclosures for statement of cash flows.
		Nine Months Ended September 30,
		2014			2013
		(In Thousands)
	Supplemental disclosures of cash flow information:
	Interest paid	$	202,851		$	197,911
	Net income taxes paid	95,167			87,838
	Supplemental schedule of noncash investing and financing activities:
	Transfer of loans and loans held for sale to OREO	$	14,278		$	39,165
	Transfer of loans to loans held for sale	14,129			55,000
	Change in unrealized gain (loss) on available for sale securities	16,211			(191,187		)
	Issuance of restricted stock, net of cancellations	(1,060		)	(596		)
	Business combinations:
	Assets acquired	117,068			—
	Liabilities assumed	18,329			—

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	Segment Information
	The Company’s operating segments are based on the Company’s lines of business. Each line of business is a strategic unit that serves a particular group of customers that have certain common characteristics through various products and services. The operating segment results include certain overhead allocations and intercompany transactions. All intercompany transactions have been eliminated to determine the consolidated balances. The Company operates primarily in the United States, and, accordingly, revenue and assets outside the United States are not material. There are no individual customers whose revenues exceeded 10% of consolidated revenue. The Company’s operating segments are Wealth and Retail Banking, Commercial Banking, Corporate and Investment Banking, and Treasury.
	The Wealth and Retail Banking segment serves the Company’s consumer customers through its 673 full-service banking centers, private client offices throughout the U.S., and through the use of alternative delivery channels, such as the internet, mobile devices and telephone banking. The Wealth and Retail Banking segment provides individuals with comprehensive products and services, including home mortgages, credit and debit cards, deposit accounts, insurance products, mutual funds and brokerage services. The Wealth and Retail Banking segment also provides private banking services to high net worth individuals and wealth management services, including specialized investment portfolio management, traditional credit products, traditional trust and estate services, investment advisory services, financial counseling and customized services, to companies and their employees. In addition, the Wealth and Retail Banking segment serves the Company’s small business customers.
	The Commercial Banking segment is responsible for providing a full array of banking and investment services to businesses in the Company’s markets. In addition to traditional credit and deposit products, the Commercial Banking segment also supports its customers with capabilities in treasury management, leasing, accounts receivable purchasing, asset-based lending, international services, and insurance and investment products. In addition, the Commercial Banking segment is responsible for the Company’s indirect automobile portfolio.
	The Corporate and Investment Banking segment is responsible for providing a full array of banking and investment services to corporate and institutional clients. In addition to traditional credit and deposit products, the Corporate and Investment Banking segment also supports its customers with capabilities in treasury management, leasing, accounts receivable purchasing, asset-based lending, international services, and interest rate protection and investment products.
	The Treasury segment’s primary function is to manage the liquidity and funding positions of the Company, the interest rate sensitivity of the Company's balance sheet, and to manage the investment securities portfolio.
	Corporate Support and Other includes activities that are not directly attributable to the operating segments, such as, the activities of the Parent and corporate support functions that are not directly attributable to a strategic business segment, as well as the elimination of intercompany transactions. Corporate Support and Other also includes activities associated with assets and liabilities of Guaranty Bank acquired by the Company in 2009 and the related FDIC indemnification asset as well as the activities associated with Simple acquired by the Company in 2014.
	The following tables present the segment information for the Company’s segments.
		Three Months Ended September 30, 2014
		Wealth and Retail Banking		Commercial Banking			Corporate and Investment Banking		Treasury			Corporate Support and Other			Consolidated
		(In Thousands)
	Net interest income	$	209,186	$	212,448		$	14,804	$	711		$	44,819		$	481,968
	Allocated provision for loan losses	15,036		(5,136		)	3,549		—			(9,580		)	3,869
	Noninterest income	172,579		58,410			41,465		16,045			(62,068		)	226,431
	Noninterest expense	324,001		117,615			38,318		5,093			48,115			533,142
	Net income (loss) before income tax expense (benefit)	42,728		158,379			14,402		11,663			(55,784		)	171,388
	Income tax expense (benefit)	15,916		58,996			5,364		4,345			(56,851		)	27,770
	Net income (loss)	26,812		99,383			9,038		7,318			1,067			143,618
	Less: net income attributable to noncontrolling interests	—		382			—		433			—			815
	Net income (loss) attributable to shareholder	$	26,812	$	99,001		$	9,038	$	6,885		$	1,067		$	142,803
	Average assets	$	22,655,312	$	30,431,008		$	4,678,475	$	13,238,660		$	6,905,632		$	77,909,087
		Three Months Ended September 30, 2013
		Wealth and Retail Banking		Commercial Banking			Corporate and Investment Banking		Treasury			Corporate Support and Other			Consolidated
		(In Thousands)
	Net interest income (expense)	$	204,443	$	193,141		$	12,356	$	(3,451	)	$	95,422		$	501,911
	Allocated provision for loan losses	35,856		1,160			593		(38		)	(37		)	37,534
	Noninterest income	160,531		59,988			43,548		7,598			(60,680		)	210,985
	Noninterest expense	319,140		111,898			29,626		4,428			57,047			522,139
	Net income (loss) before income tax expense (benefit)	9,978		140,071			25,685		(243		)	(22,268		)	153,223
	Income tax expense (benefit)	3,716		52,176			9,568		(91		)	(23,439		)	41,930
	Net income (loss)	6,262		87,895			16,117		(152		)	1,171			111,293
	Less: net income attributable to noncontrolling interests	—		208			—		439			—			647
	Net income (loss) attributable to shareholder	$	6,262	$	87,687		$	16,117	$	(591	)	$	1,171		$	110,646
	Average assets	$	21,061,941	$	26,552,591		$	3,236,952	$	11,363,589		$	7,110,270		$	69,325,343
		Nine Months Ended September 30, 2014
		Wealth and Retail Banking		Commercial Banking			Corporate and Investment Banking		Treasury			Corporate Support and Other			Consolidated
		(In Thousands)
	Net interest income	$	623,347	$	622,085		$	42,802	$	4,072		$	183,735		$	1,476,041
	Allocated provision for loan losses	68,103		27,939			1,504		—			(11,159		)	86,387
	Noninterest income	496,759		184,708			125,519		63,815			(189,597		)	681,204
	Noninterest expense	957,165		355,760			105,097		12,130			167,119			1,597,271
	Net income (loss) before income tax expense (benefit)	94,838		423,094			61,720		55,757			(161,822		)	473,587
	Income tax expense (benefit)	35,327		157,603			22,991		20,770			(129,224		)	107,467
	Net income (loss)	59,511		265,491			38,729		34,987			(32,598		)	366,120
	Less: net income attributable to noncontrolling interests	—		464			—		1,308			—			1,772
	Net income (loss) attributable to shareholder	$	59,511	$	265,027		$	38,729	$	33,679		$	(32,598	)	$	364,348
	Average assets	$	22,173,516	$	29,589,172		$	4,344,414	$	12,773,685		$	6,893,604		$	75,774,391
		Nine Months Ended September 30, 2013
		Wealth and Retail Banking		Commercial Banking			Corporate and Investment Banking		Treasury			Corporate Support and Other			Consolidated
		(In Thousands)
	Net interest income (expense)	$	610,148	$	561,075		$	38,657	$	(32,167	)	$	357,459		$	1,535,172
	Allocated provision for loan losses	87,176		(12,571		)	2,817		—			3,964			81,386
	Noninterest income	480,353		171,273			101,882		74,520			(162,653		)	665,375
	Noninterest expense	955,056		329,320			89,442		11,399			237,287			1,622,504
	Net income (loss) before income tax expense (benefit)	48,269		415,599			48,280		30,954			(46,445		)	496,657
	Income tax expense (benefit)	17,980		154,810			17,984		11,530			(56,271		)	146,033
	Net income (loss)	30,289		260,789			30,296		19,424			9,826			350,624
	Less: net income attributable to noncontrolling interests	—		283			—		1,325			—			1,608
	Net income (loss) attributable to shareholder	$	30,289	$	260,506		$	30,296	$	18,099		$	9,826		$	349,016
	Average assets	$	20,774,537	$	25,330,361		$	3,090,200	$	13,385,470		$	7,125,867		$	69,706,435
	The financial information presented was derived from the internal profitability reporting system used by management to monitor and manage the financial performance of the Company. This information is based on internal management accounting policies that have been developed to reflect the underlying economics of the businesses. These policies address the methodologies applied and include policies related to funds transfer pricing, cost allocations and capital allocations.
	Funds transfer pricing was used in the determination of net interest income earned primarily on loans and deposits. The method employed for funds transfer pricing is a matched funding concept whereby lines of business which are fund providers are credited and those that are fund users are charged based on maturity, prepayment and/or repricing characteristics applied on an instrument level. Costs for centrally managed operations are generally allocated to the lines of business based on the utilization of services provided or other appropriate indicators. Capital is allocated to the lines of business based upon the underlying risks in each business considering economic and regulatory capital standards.
	The development and application of these methodologies is a dynamic process. Accordingly, prior period financials have been revised to reflect management accounting enhancements and changes in the Company's organizational structure. The 2013 segment information has been revised to conform to the 2014 presentation. In addition, unlike financial accounting, there is no authoritative literature for management accounting similar to U.S. GAAP. Consequently, reported results are not necessarily comparable to those presented by other financial institutions.

Related_Party_Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	Related Party Transactions
	The Company enters into various contracts with BBVA that affect the Company’s business and operations. The following discloses the significant transactions between the Company and BBVA during 2014 and 2013.
	The Company believes all of the transactions entered into between the Company and BBVA were transacted on terms that were no more or less beneficial to the Company than similar transactions entered into with unrelated market participants, including interest rates and transaction costs. The Company foresees executing similar transactions with BBVA in the future.
	Derivatives
	The Company has entered into various derivative contracts as noted below with BBVA as the upstream counterparty. The net fair value of outstanding derivative contracts between the Company and BBVA are detailed below.
		September 30, 2014			December 31, 2013
		(In Thousands)
	Derivative contracts
	Cash flow hedges	$	2,234		$	3,652
	Free-standing derivative instruments – risk management and other purposes	41,606			21,650
	Free-standing derivative instruments – customer accommodation	(10,905		)	(842		)
	Securities Purchased Under Agreement to Resell/ Securities Sold Under Agreement to Repurchase
	The Company enters into agreements with BBVA as the counterparty under which it purchases/sells securities subject to an obligation to resell/repurchase the same or similar securities. The following represents the amount of securities purchased under agreement to resell and securities sold under agreement to repurchase where BBVA is the counterparty.
		September 30, 2014			December 31, 2013
		(In Thousands)
	Securities purchased under agreement to resell	$	248,622		$	—
	Securities sold under agreement to repurchase	219,973			—

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Use of estimates	'
	Use of Estimates in the Preparation of Financial Statements
	The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period, the most significant of which relate to the allowance for loan losses, goodwill impairment, fair value measurements and income taxes. Actual results could differ from those estimates.
Recently issued accounting standards	'
	Recently Issued Accounting Standards
	Obligations Resulting from Joint and Several Liability Arrangements with Fixed Obligations
	In February 2013, the FASB released ASU 2013-04, Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation Is Fixed at the Reporting Date (a consensus of the FASB Emerging Issues Task Force), which provides guidance for the recognition, measurement and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date, except for obligations addressed within existing guidance in U.S. GAAP. Examples of obligations within the scope of this ASU include debt arrangements, other contractual obligations, and settled litigation and judicial rulings. The guidance in this ASU requires an entity to measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date as the sum of (a) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and (b) any additional amount the reporting entity expects to pay on behalf of its co-obligors. The guidance in this ASU also requires an entity to disclose the nature and amount of the obligations as well as other information about those obligations. The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013, with retrospective application and was adopted by the Company on January 1, 2014. The adoption of this standard did not have a material impact on the financial condition or results of operations of the Company.
	Presentation of Unrecognized Tax Benefits
	In July 2013, the FASB released ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The ASU requires that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. However, if a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The ASU is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013 and was adopted by the Company on January 1, 2014. The adoption of this standard did not have a material impact on the financial condition or results of operations of the Company.
	Accounting for Investments in Qualified Affordable Housing Projects
	In January 2014, the FASB released ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The ASU provides guidance on accounting for investments by a reporting entity in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for the low income housing tax credit. The amendments in this ASU permit reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense. The amendments in this ASU should be applied retrospectively to all periods presented. A reporting entity that uses the effective yield method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply the effective yield method for those preexisting investments. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. Early adoption is permitted and the Company elected to early adopt the amendments in this ASU on January 1, 2014. The adoption of this standard did not have a material impact on the financial condition or results of operations of the Company.
	Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure
	In January 2014, the FASB released ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The amendments in this ASU clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in this ASU are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. An entity can elect to adopt the amendments in this ASU using either a modified retrospective transition method or a prospective transition method. The adoption of this standard is not expected to have a material impact on the financial condition or results of operations of the Company.
	Revenue from Contracts with Customers
	In May 2014, the FASB released ASU 2014-09, Revenue from Contracts with Customers. The core principle of this guidance requires an entity to recognize revenue upon the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides five steps to be analyzed to accomplish the core principle. The amendments in this ASU are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2016. Early application is not permitted. The Company is currently assessing the impact that the adoption of this standard will have on the financial condition and results of operations of the Company.
	Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures
	In June 2014, the FASB issued ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The amendments in this ASU change the accounting for repurchase-to-maturity transactions to secured borrowing accounting. In addition, for repurchase financing arrangements, the amendments require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. The amendments in this ASU also require disclosures on transfers accounted for as sales in transactions that are economically similar to repurchase agreements, and provide increased transparency about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The accounting changes in this ASU and disclosures for certain transactions accounted for as a sale are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. The disclosures for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014 and for interim periods beginning after March 15, 2015. The adoption of this standard is not expected to have a material impact on the financial condition or results of operations of the Company.
Derivatives	'
	The Company has made an accounting policy decision to not offset derivative fair value amounts under master netting agreements.

Investment_Securities_Availabl1

Investment Securities Available for Sale and Investment Securities Held to Maturity (Tables)	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Schedule of adjusted cost and approximate fair value of investment securities available for sale and investments held to maturity	'
	The following table presents the adjusted cost and approximate fair value of investment securities available for sale and investment securities held to maturity.
		30-Sep-14
					Gross Unrealized
		Amortized Cost			Gains			Losses		Fair Value
		(In Thousands)
	Investment securities available for sale:
	Debt securities:
	U.S. Treasury and other U.S. government agencies	$	1,219,222		$	4,363		$	10,004	$	1,213,581
	Mortgage-backed securities	4,685,339			58,800			49,740		4,694,399
	Collateralized mortgage obligations	2,404,672			18,224			7,386		2,415,510
	States and political subdivisions	483,016			8,690			2,919		488,787
	Other	29,014			146			33		29,127
	Equity securities	484,958			51			—		485,009
	Total	$	9,306,221		$	90,274		$	70,082	$	9,326,413
	Investment securities held to maturity:
	Collateralized mortgage obligations	$	130,442		$	6,657		$	5,362	$	131,737
	Asset-backed securities	43,153			3,747			2,368		44,532
	States and political subdivisions	1,167,183			1,455			98,423		1,070,215
	Other	77,207			6,847			—		84,054
	Total	$	1,417,985		$	18,706		$	106,153	$	1,330,538
		31-Dec-13
					Gross Unrealized
		Amortized Cost			Gains			Losses		Fair Value
		(In Thousands)
	Investment securities available for sale:
	Debt securities:
	U.S. Treasury and other U.S. government agencies	$	257,844		$	4,338		$	1,245	$	260,937
	Mortgage-backed securities	5,232,504			75,912			74,625		5,233,791
	Collateralized mortgage obligations	1,747,450			23,312			14,364		1,756,398
	States and political subdivisions	518,755			8,041			17,360		509,436
	Other	40,415			27			109		40,333
	Equity securities	512,136			54			—		512,190
	Total	$	8,309,104		$	111,684		$	107,703	$	8,313,085
	Investment securities held to maturity:
	Collateralized mortgage obligations	$	145,989		$	19,848		$	3,900	$	161,937
	Asset-backed securities	67,590			4,008			6,183		65,415
	States and political subdivisions	1,225,977			843			139,816		1,087,004
	Other	79,640			13,191			1,929		90,902
	Total	$	1,519,196		$	37,890		$	151,828	$	1,405,258
Schedule of fair value and gross unrealized losses of available for sale and held to maturity securities that were in a loss position	'
	The following table discloses the fair value and the gross unrealized losses of the Company’s available for sale securities and held to maturity securities that were in a loss position at September 30, 2014 and December 31, 2013. This information is aggregated by investment category and the length of time the individual securities have been in an unrealized loss position.
		September 30, 2014
		Securities in a loss position for less than 12 months						Securities in a loss position for 12 months or longer					Total
		Fair Value			Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
		(In Thousands)
	Investment securities available for sale:
	Debt securities:
	U.S. Treasury and other U.S. government agencies	$	693,763		$	8,863		$	37,917	$	1,141		$	731,680	$	10,004
	Mortgage-backed securities	428,804			1,281			2,101,846		48,459			2,530,650		49,740
	Collateralized mortgage obligations	766,153			4,410			160,757		2,976			926,910		7,386
	States and political subdivisions	39,804			116			159,652		2,803			199,456		2,919
	Other	3,923			4			1,092		29			5,015		33
	Total	$	1,932,447		$	14,674		$	2,461,264	$	55,408		$	4,393,711	$	70,082
	Investment securities held to maturity:
	Collateralized mortgage obligations	$	25,551		$	1,000		$	30,035	$	4,362		$	55,586	$	5,362
	Asset-backed securities	4,677			48			25,145		2,320			29,822		2,368
	States and political subdivisions	8,743			35			880,861		98,388			889,604		98,423
	Other	—			—			—		—			—		—
	Total	$	38,971		$	1,083		$	936,041	$	105,070		$	975,012	$	106,153
		December 31, 2013
		Securities in a loss position for less than 12 months						Securities in a loss position for 12 months or longer					Total
		Fair Value			Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
		(In Thousands)
	Investment securities available for sale:
	Debt securities:
	U.S. Treasury and other U.S. government agencies	$	119,871		$	1,245		$	—	$	—		$	119,871	$	1,245
	Mortgage-backed securities	2,462,822			69,919			339,448		4,706			2,802,270		74,625
	Collateralized mortgage obligations	699,693			9,123			108,710		5,241			808,403		14,364
	States and political subdivisions	164,472			9,244			92,407		8,116			256,879		17,360
	Other	4,939			109			—		—			4,939		109
	Total	$	3,451,797		$	89,640		$	540,565	$	18,063		$	3,992,362	$	107,703
	Investment securities held to maturity:
	Collateralized mortgage obligations	$	1,466		$	17		$	32,370	$	3,883		$	33,836	$	3,900
	Asset-backed securities	—			—			33,362		6,183			33,362		6,183
	States and political subdivisions	313,438			26,760			642,799		113,056			956,237		139,816
	Other	—			—			4,600		1,929			4,600		1,929
	Total	$	314,904		$	26,777		$	713,131	$	125,051		$	1,028,035	$	151,828
Schedule of activity related to credit losses for debt securities where other than temporary impairments was recognized in other comprehensive income	'
	The following table discloses activity related to credit losses for debt securities where a portion of the OTTI was recognized in other comprehensive income.
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014		2013
		(In Thousands)
	Balance at beginning of period	$	21,123		$	17,541		$	20,943	$	17,318
	Reductions for securities paid off during the period (realized)	—			—			—		(239		)
	Additions for the credit component on debt securities in which OTTI was not previously recognized	—			—			—		—
	Additions for the credit component on debt securities in which OTTI was previously recognized	—			968			180		1,430
	Balance at end of period	$	21,123		$	18,509		$	21,123	$	18,509
Schedule of investments classified by contractual maturity date	'
	The maturities of the securities portfolios are presented in the following table.
	September 30, 2014		Amortized Cost			Fair Value
			(In Thousands)
	Investment securities available for sale:
	Maturing within one year		$	55,034		$	56,026
	Maturing after one but within five years		304,190			307,836
	Maturing after five but within ten years		454,373			457,511
	Maturing after ten years		917,655			910,122
			1,731,252			1,731,495
	Mortgage-backed securities and collateralized mortgage obligations		7,090,011			7,109,909
	Equity securities		484,958			485,009
	Total		$	9,306,221		$	9,326,413
	Investment securities held to maturity:
	Maturing within one year		$	31,388		$	31,168
	Maturing after one but within five years		318,323			300,768
	Maturing after five but within ten years		195,466			187,126
	Maturing after ten years		742,366			679,739
			1,287,543			1,198,801
	Collateralized mortgage obligations		130,442			131,737
	Total		$	1,417,985		$	1,330,538
Schedule of realized gain (loss) on investments	'
	The gross realized gains and losses recognized on sales of investment securities available for sale are shown in the table below.
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014		2013
		(In Thousands)
	Gross gains	$	9,710		$	—		$	47,608	$	33,030
	Gross losses	—			—			—		—
	Net realized gains	$	9,710		$	—		$	47,608	$	33,030

Loans_and_Allowance_for_Loan_L1

Loans and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2014
Receivables [Abstract]	'
Schedule of composition of loan portfolio	'
	The following table presents the composition of the loan portfolio.
		September 30, 2014				December 31, 2013
		(In Thousands)
	Commercial loans:
	Commercial, financial and agricultural	$	22,510,956			$	20,209,209
	Real estate – construction	1,977,784				1,736,348
	Commercial real estate – mortgage	9,498,561				9,106,329
	Total commercial loans	33,987,301				31,051,886
	Consumer loans:
	Residential real estate – mortgage	13,606,816				12,706,879
	Equity lines of credit	2,259,561				2,236,367
	Equity loans	629,047				644,068
	Credit card	631,000				660,073
	Consumer – direct	609,980				516,572
	Consumer – indirect	2,704,772				2,116,981
	Total consumer loans	20,441,176				18,880,940
	Covered loans	580,756				734,190
	Total loans	$	55,009,233			$	50,667,016
Schedule of purchased impaired loans	'
	The following table presents the unpaid principal balance, discount, allowance for loan losses and carrying value of the Purchased Impaired Loans.
		September 30, 2014				December 31, 2013
		(In Thousands)
	Unpaid principal balance	$	393,351			$	449,429
	Discount	(24,092		)		(60,069		)
	Allowance for loan losses	(4,198		)		(243		)
	Carrying value	$	365,061			$	389,117
Schedule of accretable yield on purchased impaired loans	'
	An analysis of the accretable yield related to the Purchased Impaired Loans follows.
		Nine Months Ended September 30,
		2014				2013
		(In Thousands)
	Balance at beginning of period	$	105,698			$	136,992
	Transfer from nonaccretable difference	7,229				32,831
	Accretion	(39,925		)		(49,916		)
	Other	—				1,516
	Balance at end of period	$	73,002			$	121,423
Schedule of purchased nonimpaired loans	'
	The following table presents the unpaid principal balance, discount, allowance for loan losses, and carrying value of the Purchased Nonimpaired Loans.
		September 30, 2014				December 31, 2013
		(In Thousands)
	Unpaid principal balance	$	337,255			$	520,723
	Discount	(125,758		)		(175,893		)
	Allowance for loan losses	(2,408		)		(2,711		)
	Carrying value	$	209,089			$	342,119
Schedule of recorded investment in covered Purchased Impaired Loans and Purchased Nonimpaired Loans	'
	The following table reflects the recorded investment in all covered Purchased Impaired Loans and Purchased Nonimpaired Loans.
		September 30, 2014												December 31, 2013
		Purchased Impaired Loans				Purchased Nonimpaired Loans				Total Covered Loans				Purchased Impaired Loans			Purchased Nonimpaired Loans			Total Covered Loans
		(In Thousands)
	Commercial, financial and agricultural	$	—			$	45,450			$	45,450			$	—		$	40,892		$	40,892
	Commercial real estate (1)	—				21,220				21,220				4,760			141,333			146,093
	Residential real estate – mortgage (2)	369,259				138,550				507,809				384,588			155,452			540,040
	Consumer loans	—				6,277				6,277				12			7,153			7,165
	Total loans	$	369,259			$	211,497			$	580,756			$	389,360		$	344,830		$	734,190
	-1	Includes real estate – construction and commercial real estate - mortgage.
	-2	Includes residential real estate – mortgage, equity lines of credit and equity loans.
Schedule of FDIC indemnification assets	'
	A summary of the activity in the FDIC indemnification asset (liability) is presented in the following table.
		Nine Months Ended September 30,
		2014				2013
		(In Thousands)
	Balance at beginning of period	$	24,315			$	271,928
	Increase (decrease) due to credit loss provision (benefit) recorded on FDIC covered loans	5,374				(8,489		)
	Amortization and accretion, net	(82,277		)		(199,021		)
	Payments to FDIC for covered assets	13,863				20,323
	Other	(3,833		)		(4,196		)
	Balance at end of period	$	(42,558	)		$	80,545
Disclosure of activity in allowance for loan losses during year	'
	The following table, which excludes loans held for sale, presents a summary of the activity in the allowance for loan losses. The portion of the allowance that has not been identified by the Company as related to specific loan categories has been allocated to the individual loan categories on a pro rata basis for purposes of the table below:
		Commercial, Financial and Agricultural				Commercial Real Estate (1)				Residential Real Estate (2)				Consumer (3)			Covered			Total Loans
		(In Thousands)
	Three months ended September 30, 2014
	Allowance for loan losses:
	Beginning balance	$	317,790			$	142,941			$	153,694			$	88,784		$	11,551		$	714,760
	Provision charged to income	(6,889		)		(8,180		)		6,963				16,216			(4,241		)	3,869
	Loans charged off	(3,404		)		(555		)		(9,852		)		(20,514		)	(1,124		)	(35,449		)
	Loan recoveries	3,818				1,285				3,266				3,909			420			12,698
	Net charge offs	414				730				(6,586		)		(16,605		)	(704		)	(22,751		)
	Ending balance	$	311,315			$	135,491			$	154,071			$	88,395		$	6,606		$	695,878
	Three months ended September 30, 2013
	Allowance for loan losses:
	Beginning balance	$	290,188			$	182,613			$	158,793			$	83,702		$	8,215		$	723,511
	Provision charged to income	16,690				(13,901		)		19,862				17,307			(2,424		)	37,534
	Loans charged off	(7,833		)		(6,525		)		(23,996		)		(17,674		)	(3,019		)	(59,047		)
	Loan recoveries	3,685				3,120				3,926				4,064			1,144			15,939
	Net charge offs	(4,148		)		(3,405		)		(20,070		)		(13,610		)	(1,875		)	(43,108		)
	Ending balance	$	302,730			$	165,307			$	158,585			$	87,399		$	3,916		$	717,937
	Nine Months Ended September 30, 2014
	Allowance for loan losses:
	Beginning balance	$	292,327			$	158,960			$	155,575			$	90,903		$	2,954		$	700,719
	Provision charged to income	30,107				(17,959		)		27,675				46,014			550			86,387
	Loans charged off	(23,855		)		(10,506		)		(39,421		)		(62,887		)	(2,131		)	(138,800		)
	Loan recoveries	12,736				4,996				10,242				14,365			5,233			47,572
	Net charge offs	(11,119		)		(5,510		)		(29,179		)		(48,522		)	3,102			(91,228		)
	Ending balance	$	311,315			$	135,491			$	154,071			$	88,395		$	6,606		$	695,878
	Nine Months Ended September 30, 2013
	Allowance for loan losses:
	Beginning balance	$	283,058			$	254,324			$	172,265			$	75,403		$	17,803		$	802,853
	Provision charged to income	37,167				(70,315		)		73,709				50,936			(10,111		)	81,386
	Loans charged off	(31,044		)		(34,268		)		(96,289		)		(52,744		)	(6,444		)	(220,789		)
	Loan recoveries	13,549				15,566				8,900				13,804			2,668			54,487
	Net charge offs	(17,495		)		(18,702		)		(87,389		)		(38,940		)	(3,776		)	(166,302		)
	Ending balance	$	302,730			$	165,307			$	158,585			$	87,399		$	3,916		$	717,937
	-1	Includes commercial real estate – mortgage and real estate – construction loans.
	-2	Includes residential real estate – mortgage, equity lines of credit and equity loans.
	-3	Includes credit card, consumer – direct and consumer – indirect loans.
	The table below provides a summary of the allowance for loan losses and related loan balances by portfolio.
		Commercial, Financial and Agricultural				Commercial Real Estate (1)				Residential Real Estate (2)				Consumer (3)			Covered			Total Loans
		(In Thousands)
	September 30, 2014
	Ending balance of allowance attributable to loans:
	Individually evaluated for impairment	$	20,620			$	6,403			$	39,683			$	1,031		$	—		$	67,737
	Collectively evaluated for impairment	290,695				129,088				114,388				87,364			—			621,535
	Covered purchased impaired	—				—				—				—			4,198			4,198
	Covered purchased nonimpaired	—				—				—				—			2,408			2,408
	Total allowance for loan losses	$	311,315			$	135,491			$	154,071			$	88,395		$	6,606		$	695,878
	Loans:
	Ending balance of loans:
	Individually evaluated for impairment	$	70,086			$	114,165			$	192,909			$	1,431		$	—		$	378,591
	Collectively evaluated for impairment	22,440,870				11,362,180				16,302,515				3,944,321			—			54,049,886
	Covered purchased impaired	—				—				—				—			369,259			369,259
	Covered purchased nonimpaired	—				—				—				—			211,497			211,497
	Total loans	$	22,510,956			$	11,476,345			$	16,495,424			$	3,945,752		$	580,756		$	55,009,233
	December 31, 2013
	Ending balance of allowance attributable to loans:
	Individually evaluated for impairment	$	28,828			$	9,408			$	41,989			$	1,526		$	—		$	81,751
	Collectively evaluated for impairment	263,499				149,552				113,586				89,377			—			616,014
	Covered purchased impaired	—				—				—				—			243			243
	Covered purchased nonimpaired	—				—				—				—			2,711			2,711
	Total allowance for loan losses	$	292,327			$	158,960			$	155,575			$	90,903		$	2,954		$	700,719
	Loans:
Ending balance of loans:
Individually evaluated for impairment	$	138,047			$	167,598			$	196,723			$	1,625		$	—		$	503,993
Collectively evaluated for impairment	20,071,162				10,675,079				15,390,591				3,292,001			—			49,428,833
Covered purchased impaired	—				—				—				—			389,360			389,360
Covered purchased nonimpaired	—				—				—				—			344,830			344,830
Total loans	$	20,209,209			$	10,842,677			$	15,587,314			$	3,293,626		$	734,190		$	50,667,016
-1	Includes commercial real estate – mortgage and real estate – construction loans.
-2	Includes residential real estate – mortgage, equity lines of credit and equity loans.
-3	Includes credit card, consumer – direct and consumer – indirect loans.
Schedule of impaired financing receivables	'
	The following table presents information on individually analyzed impaired loans, by loan class.
		September 30, 2014
		Individually Analyzed Impaired Loans With No Recorded Allowance												Individually Analyzed Impaired Loans With a Recorded Allowance
		Recorded Investment				Unpaid Principal Balance				Allowance				Recorded Investment			Unpaid Principal Balance			Allowance
		(In Thousands)
	Commercial, financial and agricultural	$	6,098			$	12,694			$	—			$	63,988		$	75,458		$	20,620
	Real estate – construction	4,509				5,040				—				2,851			3,420			507
	Commercial real estate – mortgage	20,144				20,940				—				86,661			92,631			5,896
	Residential real estate – mortgage	10,031				10,031				—				104,205			104,289			6,988
	Equity lines of credit	—				—				—				24,189			24,235			22,815
	Equity loans	—				—				—				54,484			54,814			9,880
	Credit card	—				—				—				—			—			—
	Consumer – direct	—				—				—				88			88			33
	Consumer – indirect	—				—				—				1,343			1,343			998
	Total loans	$	40,782			$	48,705			$	—			$	337,809		$	356,278		$	67,737
		December 31, 2013
		Individually Analyzed Impaired Loans With No Recorded Allowance												Individually Analyzed Impaired Loans With a Recorded Allowance
		Recorded Investment				Unpaid Principal Balance				Allowance				Recorded Investment			Unpaid Principal Balance			Allowance
		(In Thousands)
	Commercial, financial and agricultural	$	19,984			$	27,639			$	—			$	118,063		$	138,092		$	28,828
	Real estate – construction	1,314				1,555				—				9,248			10,812			836
	Commercial real estate – mortgage	51,303				54,821				—				105,733			112,177			8,572
	Residential real estate – mortgage	1,906				1,906				—				115,550			115,734			7,378
	Equity lines of credit	—				—				—				23,593			24,021			23,190
	Equity loans	—				—				—				55,674			55,794			11,421
	Credit card	—				—				—				—			—			—
	Consumer – direct	—				—				—				182			181			83
	Consumer – indirect	—				—				—				1,443			1,443			1,443
	Total loans	$	74,507			$	85,921			$	—			$	429,486		$	458,254		$	81,751
	The following table presents information on individually analyzed impaired loans, by loan class.
		Three Months Ended September 30, 2014								Three Months Ended September 30, 2013
		Average Recorded Investment				Interest Income Recognized				Average Recorded Investment				Interest Income Recognized
		(In Thousands)
	Commercial, financial and agricultural	$	70,256			$	182			$	151,326			$	286
	Real estate – construction	9,054				58				16,666				94
	Commercial real estate – mortgage	108,323				754				196,009				1,219
	Residential real estate – mortgage	112,912				724				125,699				773
	Equity lines of credit	24,010				268				23,835				254
	Equity loans	54,506				432				51,822				395
	Credit card	—				—				—				—
	Consumer – direct	94				1				216				2
	Consumer – indirect	1,276				1				1,735				1
	Total loans	$	380,431			$	2,420			$	567,308			$	3,024
		Nine Months Ended September 30, 2014								Nine Months Ended September 30, 2013
		Average Recorded Investment				Interest Income Recognized				Average Recorded Investment				Interest Income Recognized
		(In Thousands)
	Commercial, financial and agricultural	$	95,116			$	970			$	128,472			$	1,007
	Real estate – construction	9,421				177				64,136				637
	Commercial real estate – mortgage	122,358				2,531				222,189				3,478
	Residential real estate – mortgage	113,579				2,168				147,853				2,710
	Equity lines of credit	23,641				773				10,527				335
	Equity loans	54,977				1,286				40,600				1,086
	Credit card	—				—				—				—
	Consumer – direct	131				3				170				30
	Consumer – indirect	1,283				3				801				12
	Total loans	$	420,506			$	7,911			$	614,748			$	9,295
Schedule of credit quality indicators associated with the Company's loans	'
	The following tables, which exclude loans held for sale and covered loans, illustrate the credit quality indicators associated with the Company’s loans, by loan class.
		Commercial
		September 30, 2014
		Commercial, Financial and Agricultural				Real Estate - Construction				Commercial Real Estate - Mortgage
		(In Thousands)
	Noncovered loans:
	Pass	$	22,036,391			$	1,959,687			$	9,134,217
	Special Mention	254,768				8,832				183,690
	Substandard	188,293				7,891				153,722
	Doubtful	31,504				1,374				26,932
		$	22,510,956			$	1,977,784			$	9,498,561
		December 31, 2013
		Commercial, Financial and Agricultural				Real Estate - Construction				Commercial Real Estate - Mortgage
		(In Thousands)
	Noncovered loans:
	Pass	$	19,582,014			$	1,707,719			$	8,562,261
	Special Mention	353,638				9,918				271,500
	Substandard	261,995				17,112				243,042
	Doubtful	11,562				1,599				29,526
		$	20,209,209			$	1,736,348			$	9,106,329
		Consumer
		30-Sep-14
		Residential Real Estate – Mortgage				Equity Lines of Credit				Equity Loans				Credit Card			Consumer - Direct			Consumer –Indirect
		(In Thousands)
	Noncovered loans:
	Performing	$	13,499,841			$	2,222,138			$	608,848			$	622,226		$	607,594		$	2,701,787
	Nonperforming	106,975				37,423				20,199				8,774			2,386			2,985
		$	13,606,816			$	2,259,561			$	629,047			$	631,000		$	609,980		$	2,704,772
		December 31, 2013
		Residential Real Estate -Mortgage				Equity Lines of Credit				Equity Loans				Credit Card			Consumer -Direct			Consumer –Indirect
		(In Thousands)
	Noncovered loans:
	Performing	$	12,601,515			$	2,199,827			$	621,897			$	649,796		$	513,630		$	2,113,918
	Nonperforming	105,364				36,540				22,171				10,277			2,942			3,063
		$	12,706,879			$	2,236,367			$	644,068			$	660,073		$	516,572		$	2,116,981
Schedule of past due loans	'
	The following tables present an aging analysis of the Company’s past due loans, excluding loans classified as held for sale and Purchased Impaired Loans.
		September 30, 2014
		30-59 Days Past Due				60-89 Days Past Due				90 Days or More Past Due				Nonaccrual			Accruing TDRs			Total Past Due and Impaired			Not Past Due or Impaired		Total
		(In Thousands)
	Commercial, financial and agricultural	$	12,846			$	3,261			$	838			$	79,577		$	10,444		$	106,966		$	22,403,990	$	22,510,956
	Real estate – construction	526				109				464				9,928			672			11,699			1,966,085		1,977,784
	Commercial real estate – mortgage	7,716				3,129				3,448				92,718			43,023			150,034			9,348,527		9,498,561
	Residential real estate – mortgage	37,711				20,447				2,474				104,192			72,590			237,414			13,369,402		13,606,816
	Equity lines of credit	8,046				3,966				3,308				34,115			—			49,435			2,210,126		2,259,561
	Equity loans	5,624				2,746				1,068				18,637			42,595			70,670			558,377		629,047
	Credit card	5,566				3,718				8,774				—			—			18,058			612,942		631,000
	Consumer – direct	7,751				1,678				1,984				402			57			11,872			598,108		609,980
	Consumer – indirect	30,348				6,379				1,389				1,596			—			39,712			2,665,060		2,704,772
	Covered loans	1,057				689				4,088				3,772			2,399			12,005			199,492		211,497
	Total loans	$	117,191			$	46,122			$	27,835			$	344,937		$	171,780		$	707,865		$	53,932,109	$	54,639,974
		December 31, 2013
		30-59 Days Past Due				60-89 Days Past Due				90 Days or More Past Due				Nonaccrual			Accruing TDRs			Total Past Due and Impaired			Not Past Due or Impaired		Total
		(In Thousands)
	Commercial, financial and agricultural	$	9,485			$	6,111			$	2,212			$	128,231		$	25,548		$	171,587		$	20,037,622	$	20,209,209
	Real estate – construction	4,258				1,862				240				14,183			3,801			24,344			1,712,004		1,736,348
	Commercial real estate – mortgage	9,521				4,869				797				129,672			59,727			204,586			8,901,743		9,106,329
	Residential real estate – mortgage	48,597				22,629				2,460				102,904			74,236			250,826			12,456,053		12,706,879
	Equity lines of credit	12,230				6,252				5,109				31,431			—			55,022			2,181,345		2,236,367
	Equity loans	7,630				3,170				1,167				20,447			42,850			75,264			568,804		644,068
	Credit card	5,955				4,676				10,277				—			—			20,908			639,165		660,073
	Consumer – direct	8,736				3,000				2,402				540			91			14,769			501,803		516,572
	Consumer – indirect	24,945				5,276				1,540				1,523			—			33,284			2,083,697		2,116,981
	Covered loans	1,247				290				4,122				5,425			3,455			14,539			330,291		344,830
	Total loans	$	132,604			$	58,135			$	30,326			$	434,356		$	209,708		$	865,129		$	49,412,527	$	50,277,656
Schedule of troubled debt restructuring loans	'
	The following table presents an analysis of the types of loans that were restructured and classified as TDRs, excluding loans classified as held for sale.
		Three Months Ended September 30, 2014							Three Months Ended September 30, 2013
		Number of Contracts			Post-Modification Outstanding Recorded Investment				Number of Contracts			Post-Modification Outstanding Recorded Investment
		(Dollars in Thousands)
	Commercial, financial and agricultural	2			$	14,118			1			$	1,351
	Real estate – construction	2			405				—			—
	Commercial real estate – mortgage	—			—				1			115
	Residential real estate – mortgage	18			3,255				21			2,527
	Equity lines of credit	32			1,946				22			898
	Equity loans	13			920				31			3,388
	Credit card	—			—				—			—
	Consumer – direct	—			—				2			5
	Consumer – indirect	21			343				20			184
	Covered loans	1			3				1			22
		Nine Months Ended September 30, 2014							Nine Months Ended September 30, 2013
		Number of Contracts			Post-Modification Outstanding Recorded Investment				Number of Contracts			Post-Modification Outstanding Recorded Investment
		(Dollars in Thousands)
	Commercial, financial and agricultural	4			$	14,281			7			$	6,410
	Real estate – construction	2			405				3			2,409
	Commercial real estate – mortgage	9			6,586				14			3,947
	Residential real estate – mortgage	74			8,373				190			26,038
	Equity lines of credit	129			6,426				482			24,134
	Equity loans	54			4,237				390			16,648
	Credit card	—			—				—			—
	Consumer – direct	—			—				17			138
	Consumer – indirect	71			1,015				404			2,188
	Covered loans	1			3				3			71
	The following table provides a breakout of TDRs, including nonaccrual loans and covered loans and excluding loans classified as held for sale.
		September 30, 2014
		30-59 Days Past Due				60-89 Days Past Due				90 Days or More Past Due				Nonaccrual			Total Past Due and Nonaccrual			Not Past Due or Nonaccrual			Total
		(In Thousands)
	Commercial, financial and agricultural	$	—			$	—			$	188			$	18,517		$	18,705		$	10,256		$	28,961
	Real estate – construction	—				—				—				175			175			672			847
	Commercial real estate – mortgage	—				21				—				10,208			10,229			43,002			53,231
	Residential real estate – mortgage	5,098				2,485				309				29,118			37,010			64,698			101,708
	Equity lines of credit	—				—				—				24,189			24,189			—			24,189
	Equity loans	2,094				2,069				494				11,994			16,651			37,938			54,589
	Credit card	—				—				—				—			—			—			—
	Consumer – direct	—				—				—				32			32			57			89
	Consumer – indirect	—				—				—				1,342			1,342			—			1,342
	Covered loans	6				214				—				1,369			1,589			2,179			3,768
	Total loans	$	7,198			$	4,789			$	991			$	96,944		$	109,922		$	158,802		$	268,724
		December 31, 2013
		30-59 Days Past Due				60-89 Days Past Due				90 Days or More Past Due				Nonaccrual			Total Past Due and Nonaccrual			Not Past Due or Nonaccrual			Total
		(In Thousands)
	Commercial, financial and agricultural	$	5			$	—			$	—			$	20,498		$	20,503		$	25,543		$	46,046
	Real estate – construction	32				50				—				181			263			3,719			3,982
	Commercial real estate – mortgage	2,345				—				—				13,910			16,255			57,382			73,637
	Residential real estate – mortgage	3,755				2,747				760				30,492			37,754			66,974			104,728
	Equity lines of credit	—				—				—				24,592			24,592			—			24,592
	Equity loans	1,799				1,022				557				12,823			16,201			39,472			55,673
	Credit card	—				—				—				—			—			—			—
	Consumer – direct	—				—				—				90			90			91			181
	Consumer – indirect	—				—				—				1,443			1,443			—			1,443
	Covered loans	21				—				—				5,428			5,449			3,434			8,883
	Total loans	$	7,957			$	3,819			$	1,317			$	109,457		$	122,550		$	196,615		$	319,165
Schedule of subsequent default on restructured loans	'
	The following tables provide a summary of initial subsequent defaults that occurred within one year of the restructure date. The table excludes loans classified as held for sale as of period-end and includes loans no longer in default as of period-end.
		Three Months Ended September 30, 2014							Three Months Ended September 30, 2013
		Number of Contracts			Recorded Investment at Default				Number of Contracts			Recorded Investment at Default
		(Dollars in Thousands)
	Commercial, financial and agricultural	—			$	—			—			$	—
	Real estate – construction	—			—				—			—
	Commercial real estate – mortgage	—			—				1			422
	Residential real estate – mortgage	2			144				2			201
	Equity lines of credit	—			—				5			309
	Equity loans	3			381				5			370
	Credit card	—			—				—			—
	Consumer – direct	—			—				—			—
	Consumer – indirect	—			—				—			—
	Covered loans	—			—				1			35
		Nine Months Ended September 30, 2014							Nine Months Ended September 30, 2013
		Number of Contracts			Recorded Investment at Default				Number of Contracts			Recorded Investment at Default
		(Dollars in Thousands)
	Commercial, financial and agricultural	—			$	—			1			$	9,531
	Real estate – construction	—			—				—			—
	Commercial real estate – mortgage	1			2,198				2			529
	Residential real estate – mortgage	2			144				12			2,336
	Equity lines of credit	3			275				5			309
	Equity loans	7			763				6			424
	Credit card	—			—				—			—
	Consumer – direct	—			—				—			—
	Consumer – indirect	—			—				—			—
	Covered loans	—			—				1			35

Loan_Sales_and_Servicing_Table

Loan Sales and Servicing (Tables)	9 Months Ended
	Sep. 30, 2014
Transfers and Servicing [Abstract]	'
Schedule of loans held for sale	'
	The following table presents the composition of the loans held for sale portfolio.
		September 30, 2014			December 31, 2013
		(In Thousands)
	Loans held for sale:
	Real estate – construction	$	—		$	4,447
	Commercial real estate – mortgage	—			2,912
	Residential real estate – mortgage	190,882			139,750
	Total loans held for sale	$	190,882		$	147,109
Schedule of residential real estate mortgage servicing rights	'
	The following table is an analysis of the activity in the Company’s residential MSRs.
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(In Thousands)
	Carrying value, at beginning of period	$	31,104		$	22,623		$	30,065		$	13,255
	Additions	4,060			4,865			8,066			13,998
	Increase (decrease) in fair value:
	Due to changes in valuation inputs or assumptions	367			1,914			(1,427		)	2,960
	Due to other changes in fair value (1)	(639		)	(341		)	(1,812		)	(1,152		)
	Carrying value, at end of period	$	34,892		$	29,061		$	34,892		$	29,061
	-1	Represents the realization of expected net servicing cash flows, expected borrower repayments and the passage of time.
Schedule of sensitivity of current fair value of residential real estate mortgage servicing rights	'
	At September 30, 2014 and December 31, 2013, the sensitivity of the current fair value of the residential MSRs to immediate 10% and 20% adverse changes in key economic assumptions are included in the following table:
		September 30, 2014			December 31, 2013
		(Dollars in Thousands)
	Fair value of residential mortgage servicing rights	$	34,892		$	30,065
	Composition of residential loans serviced for others:
	Fixed rate mortgage loans	96.1		%	96.4		%
	Adjustable rate mortgage loans	3.9			3.6
	Total	100		%	100		%
	Weighted average life (in years)	6.4			6.9
	Prepayment speed:	10		%	8.8		%
	Effect on fair value of a 10% increase	$	(1,085	)	$	(743	)
	Effect on fair value of a 20% increase	(2,131		)	(1,492		)
	Weighted average discount rate:	10.1		%	10		%
	Effect on fair value of a 10% increase	$	(1,272	)	$	(1,167	)
	Effect on fair value of a 20% increase	(2,453		)	(2,247		)

Derivatives_and_Hedging_Tables

Derivatives and Hedging (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	'
	The following table reflects the notional amount and fair value of derivative instruments included on the Company’s Unaudited Condensed Consolidated Balance Sheets on a gross basis.
		September 30, 2014												December 31, 2013
						Fair Value												Fair Value
		Notional Amount				Derivative Assets (1)				Derivative Liabilities (2)				Notional Amount				Derivative Assets (1)		Derivative Liabilities (2)
		(In Thousands)
	Derivatives designated as hedging instruments:
	Fair value hedges:
	Interest rate swaps related to long-term debt	$	1,423,950			$	62,272			$	164			$	423,950			$	67,623	$	—
	Total fair value hedges					62,272				164								67,623		—
	Cash flow hedges:
	Interest rate contracts:
	Swaps related to commercial loans	600,000				2,234				2,116				200,000				3,652		—
	Swaps related to FHLB advances	320,000				—				12,071				320,000				—		11,862
	Total cash flow hedges					2,234				14,187								3,652		11,862
	Total derivatives designated as hedging instruments					$	64,506			$	14,351							$	71,275	$	11,862
	Free-standing derivatives not designated as hedging instruments:
	Free-standing derivative instruments-risk management and other purposes:
	Interest rate contracts:
	Forward and option contracts related to held for sale mortgages	$	270,600			$	97			$	795			$	171,364			$	1,727	$	56
	Equity contracts:
	Purchased equity option related to equity-linked CDs	778,355				72,561				—				588,377				47,875		—
	Swap associated with sale of Visa, Inc. Class B shares	46,705				—				1,168				49,748				—		1,244
	Foreign exchange contracts:
	Forwards related to commercial loans	669,410				9,372				225				424,797				1,072		2,690
	Spots related to commercial loans	41,702				1				133				41,133				55		56
	Total free-standing derivative instruments-risk management and other purposes					$	82,031			$	2,321							$	50,729	$	4,046
	Free-standing derivative instruments – customer accommodation:
	Futures contracts (3)	$	427,000			$	—			$	—			$	657,000			$	—	$	—
	Interest rate lock commitments	226,010				2,981				2				129,791				947		57
	Written equity option related to equity-linked CDs	754,859				—				70,894				576,196				—		46,573
	Trading account assets and liabilities:
	Interest rate contracts for customers	15,946,776				247,415				188,608				13,474,347				262,578		200,899
	Commodity contracts for customers	453,899				10,990				9,692				906,650				23,132		18,373
	Foreign exchange contracts for customers	356,217				4,952				4,266				145,175				4,450		3,894
	Total trading account assets and liabilities					263,357				202,566								290,160		223,166
	Total free-standing derivative instruments- customer accommodations					$	266,338			$	273,462							$	291,107	$	269,796
	-1	Derivative assets, except for trading account assets that are recorded as a component of trading account assets on the Company's Unaudited Condensed Consolidated Balance Sheets, are recorded in other assets on the Company’s Unaudited Condensed Consolidated Balance Sheets.
	-2	Derivative liabilities are recorded in accrued expenses and other liabilities on the Company’s Unaudited Condensed Consolidated Balance Sheets.
	-3	Changes in fair value are cash settled daily; therefore, there is no ending balance at any given reporting period.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location	'
	The following table reflects the change in fair value for interest rate contracts and the related hedged items as well as other gains and losses related to fair value hedges including gains or losses recognized because of hedge ineffectiveness.
				Gain (Loss) for the
		Condensed Consolidated		Three Months Ended September 30,								Nine Months Ended September 30,
		Statements of Income Caption		2014				2013				2014				2013
				(In Thousands)
	Change in fair value of interest rate contracts:
	Interest rate swaps hedging long term debt	Interest on FHLB and other borrowings		$	(5,391	)		$	(2,271	)		$	(5,515	)		$	(29,995	)
	Hedged long term debt	Interest on FHLB and other borrowings		4,829				2,748				5,048				30,792
	Other gains on interest rate contracts:
	Interest and amortization related to interest rate swaps on hedged long term debt	Interest on FHLB and other borrowings		6,081				5,209				18,114				17,550
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location	'
	The following table presents the effect of derivative instruments designated and qualifying as cash flow hedges on the Company’s Unaudited Condensed Consolidated Balance Sheets and the Company’s Unaudited Condensed Consolidated Statements of Income.
		Gain (Loss) for the
		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2014				2013				2014				2013
		(In Thousands)
	Interest rate contracts:
	Net change in amount recognized in other comprehensive income	$	(706	)		$	226			$	(2,388	)		$	6,491
	Amount reclassified from accumulated other comprehensive income into net interest income	(41		)		(1,524		)		(1,768		)		(3,800		)
	Amount of ineffectiveness recognized in net interest income	—				—				—				—
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position	'
	The net gains and losses recorded in the Company's Unaudited Condensed Consolidated Statements of Income relating to free-standing derivative instruments used as a customer accommodation are summarized in the following table.
				Gain (Loss) for the
		Condensed Consolidated		Three Months Ended September 30,								Nine Months Ended September 30,
		Statements of Income Caption		2014				2013				2014				2013
				(In Thousands)
	Futures contracts	Corporate and correspondent investment sales		$	87			$	(339	)		$	(146	)		$	278
	Interest rate contracts:
	Interest rate contracts for customers	Corporate and correspondent investment sales		4,800				5,944				13,958				22,252
	Interest rate lock commitments	Mortgage banking income		(842		)		3,289				2,089				(1,194		)
	Commodity contracts:
	Commodity contracts for customers	Corporate and correspondent investment sales		191				(6		)		94				20
	Foreign currency contracts:
	Foreign currency exchange contracts for customers	Corporate and correspondent investment sales		309				63				679				346
	Equity contracts:
	Written equity option related to equity-linked CDs	Other expense		(17,777		)		(6,482		)		(24,321		)		(11,637		)
	The net gains and losses recorded in the Company's Unaudited Condensed Consolidated Statements of Income from free-standing derivative instruments used for risk management and other purposes are summarized in the following table.
				Gain (Loss) for the
		Condensed Consolidated		Three Months Ended September 30,								Nine Months Ended September 30,
		Statements of Income Caption		2014				2013				2014				2013
				(In Thousands)
	Interest rate contracts:
	Forward & option contracts related to residential mortgage loans held for sale	Mortgage banking income		$	1,558			$	(17,705	)		$	(2,549	)		$	(4,961	)
	Equity contracts:
	Purchased equity option related to equity-linked CDs	Other expense		17,979				6,527				24,686				11,769
	Foreign currency contracts:
	Forward contracts related to commercial loans	Other income		44,452				(15,721		)		27,022				(4,700		)
	Spot contracts related to commercial loans	Other income		(4,459		)		1,683				(1,052		)		878

Assets_and_Liabilities_Subject1

Assets and Liabilities Subject to Enforceable Master Netting Arrangements (Tables)	9 Months Ended
	Sep. 30, 2014
Offsetting [Abstract]	'
Schedule of assets and liabilities subject to enforceable master netting arrangements	'
	The following represents the Company’s assets/liabilities subject to an enforceable master netting arrangement. The derivative instruments the Company has with its customers are not subject to an enforceable master netting arrangement.
								Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets
		Gross Amounts Recognized		Gross Amounts Offset in the Condensed Consolidated Balance Sheets		Net Amount Presented in the Condensed Consolidated Balance Sheets		Financial Instruments (1)		Cash Collateral Received/ Pledged (1)		Net Amount
		(In Thousands)
	September 30, 2014
	Securities purchased under agreements to resell:
	Subject to a master netting arrangement	$	248,622	$	—	$	248,622	$	248,508	$	—	$	114
	Derivative financial assets:
	Subject to a master netting arrangement	$	203,951	$	—	$	203,951	$	17,855	$	54,358	$	131,738
	Not subject to a master netting arrangement	208,924		—		208,924		—		—		208,924
	Total derivative financial assets	$	412,875	$	—	$	412,875	$	17,855	$	54,358	$	340,662
	Securities sold under agreements to repurchase:
	Subject to a master netting arrangement	$	219,973	$	—	$	219,973	$	219,850	$	—	$	123
	Derivative financial liabilities:
	Subject to a master netting arrangement	$	197,979	$	—	$	197,979	$	34,626	$	29,058	$	134,295
	Not subject to a master netting arrangement	92,155		—		92,155		—		—		92,155
	Total derivative financial liabilities	$	290,134	$	—	$	290,134	$	34,626	$	29,058	$	226,450
	December 31, 2013
	Derivative financial assets:
	Subject to a master netting arrangement	$	192,771	$	—	$	192,771	$	7,723	$	37,189	$	147,859
	Not subject to a master netting arrangement	220,340		—		220,340		—		—		220,340
	Total derivative financial assets	$	413,111	$	—	$	413,111	$	7,723	$	37,189	$	368,199
	Derivative financial liabilities:
	Subject to a master netting arrangement	$	200,207	$	—	$	200,207	$	46,466	$	25,910	$	127,831
	Not subject to a master netting arrangement	85,497		—		85,497		—		—		85,497
	Total derivative financial liabilities	$	285,704	$	—	$	285,704	$	46,466	$	25,910	$	213,328
	-1	The actual amount of collateral received/pledged is limited to the asset/liability balance and does not include excess collateral received/pledged. When excess collateral exists the collateral shown in the table above has been allocated based on the percentage of the actual amount of collateral posted.

Commitment_Contingencies_and_G

Commitment, Contingencies and Guarantees (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of commitments to extend credit, standby letters of credit and commercial letters of credit	'
	The following represents the Company’s commitments to extend credit, standby letters of credit and commercial letters of credit:
		September 30, 2014		December 31, 2013
		(In Thousands)
	Commitments to extend credit	$	27,313,485	$	26,545,608
	Standby and commercial letters of credit	1,971,051		2,093,159

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule of differences between aggregate fair value and aggregate unpaid principle balance	'
	The following tables summarize the difference between the aggregate fair value and the aggregate unpaid principal balance for residential mortgage loans measured at fair value.
		Aggregate Fair Value			Aggregate Unpaid Principal Balance			Difference
		(In Thousands)
	September 30, 2014
	Residential mortgage loans held for sale	$	190,882		$	184,639		$	6,243
	December 31, 2013
	Residential mortgage loans held for sale	$	139,750		$	137,300		$	2,450
Summary of asset and liabilities measure at fair value on a recurring basis	'
	The following tables summarize the financial assets and liabilities measured at fair value on a recurring basis.
					Fair Value Measurements at the End of the Reporting Period Using
		Fair Value			Quoted Prices in Active Markets for Identical Assets			Significant Other Observable Inputs			Significant Unobservable Inputs
		September 30, 2014			(Level 1)			(Level 2)			(Level 3)
		(In Thousands)
	Recurring fair value measurements
	Assets:
	Trading account assets:
	U.S. Treasury and other U.S. government agencies	$	244,718		$	244,718		$	—		$	—
	Other debt securities	5,221			—			5,221			—
	Interest rate contracts	247,415			—			247,415			—
	Commodity contracts	10,990			—			10,990			—
	Foreign exchange contracts	4,952			—			4,952			—
	Other trading assets	1,840			—			121			1,719
	Total trading account assets	515,136			244,718			268,699			1,719
	Loans held for sale	190,882			—			190,882			—
	Investment securities available for sale:
	U.S. Treasury and other U.S. government agencies	1,213,581			433,680			779,901			—
	Mortgage-backed securities	4,694,399			—			4,694,399			—
	Collateralized mortgage obligations	2,415,510			—			2,415,510			—
	States and political subdivisions	488,787			—			488,787			—
	Other debt securities	29,127			29,127			—			—
	Equity securities (1)	59			53			—			6
	Total investment securities available for sale	8,841,463			462,860			8,378,597			6
	Derivative assets:
	Interest rate contracts	67,584			—			64,603			2,981
	Equity contracts	72,561			—			72,561			—
	Foreign exchange contracts	9,373			—			9,373			—
	Total derivative assets	149,518			—			146,537			2,981
	Other assets	34,892			—			—			34,892
	Liabilities:
	Trading account liabilities:
	U.S. Treasury and other U.S. government agencies	$	245,742		$	245,742		$	—		$	—
	Interest rate contracts	188,608			—			188,608			—
	Commodity contracts	9,692			—			9,692			—
	Foreign exchange contracts	4,266			—			4,266			—
	Other debt securities	973			—			973			—
	Other trading liabilities	120			—			120			—
	Total trading account liabilities	449,401			245,742			203,659			—
	Derivative liabilities:
	Interest rate contracts	15,148			—			15,146			2
	Equity contracts	70,894			—			70,894			—
	Foreign exchange contracts	358			—			358			—
	Total derivative liabilities	86,400			—			86,398			2
	-1	Excludes $485 million of FHLB and Federal Reserve stock required to be owned by the Company at September 30, 2014. These securities are carried at par.
					Fair Value Measurements at the End of the Reporting Period Using
		Fair Value			Quoted Prices in Active Markets for Identical Assets			Significant Other Observable Inputs			Significant Unobservable Inputs
		December 31, 2013			(Level 1)			(Level 2)			(Level 3)
		(In Thousands)
	Recurring fair value measurements
	Assets:
	Trading account assets:
	U.S. Treasury and other U.S. government agencies	$	24,655		$	—		$	24,655		$	—
	Mortgage-backed securities	1,285			—			1,285			—
	State and political subdivisions	2,160			—			2,160			—
	Other equity securities	2			—			2			—
	Interest rate contracts	262,578			—			262,578			—
	Commodity contracts	23,132			—			23,132			—
	Foreign exchange contracts	4,450			—			4,450			—
	Other trading assets	1,668			—			23			1,645
	Total trading account assets	319,930			—			318,285			1,645
	Loans held for sale	139,750			—			139,750			—
	Investment securities available for sale:
U.S. Treasury and other U.S. government agencies	260,937			—			260,937			—
Mortgage-backed securities	5,233,791			—			5,233,791			—
Collateralized mortgage obligations	1,756,398			—			1,756,398			—
States and political subdivisions	509,436			—			509,436			—
Other debt securities	40,333			40,283			50			—
Equity securities (1)	63			57			—			6
Total investment securities available for sale	7,800,958			40,340			7,760,612			6
Derivative assets:
Interest rate contracts	73,949			—			73,002			947
Equity contracts	47,875			—			47,875			—
Foreign exchange contracts	1,127			—			1,127			—
Total derivative assets	122,951			—			122,004			947
Other assets	30,065			—			—			30,065
Liabilities:
Trading account liabilities:
Mortgage-backed securities	$	5,568		$	—		$	5,568		$	—
Interest rate contracts	200,899			—			200,899			—
Commodity contracts	18,373			—			18,373			—
Foreign exchange contracts	3,894			—			3,894			—
Other trading liabilities	23			—			23			—
Total trading account liabilities	228,757			—			228,757			—
Derivative liabilities:
Interest rate contracts	11,975			—			11,918			57
Equity contracts	46,573			—			46,573			—
Foreign exchange contracts	2,746			—			2,746			—
Total derivative liabilities	61,294			—			61,237			57
-1	Excludes $512 million of FHLB and Federal Reserve stock required to be owned by the Company at December 31, 2013. These securities are carried at par.
Reconciliation of assets measured on a recurring basis using significant unobservable inputs	'
	The following table reconciles the assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
		Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	Three Months Ended September 30,	Other Trading Assets			Equity Securities			Interest Rate Contracts, net			Other Assets
		(In Thousands)
	Balance, July 1, 2013	$	1,962		$	6		$	533		$	22,623
	Transfers into Level 3	—			—			—			—
	Transfers out of Level 3	—			—			—			—
	Total gains or losses (realized/unrealized):
	Included in earnings (1)	(172		)	—			3,289			1,573
	Included in other comprehensive income	—			—			—			—
	Purchases, issuances, sales and settlements:
	Purchases	—			—			—			—
	Issuances	—			—			—			4,865
	Sales	—			—			—			—
	Settlements	—			—			—			—
	Balance, September 30, 2013	$	1,790		$	6		$	3,822		$	29,061
	Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at September 30, 2013	$	(172	)	$	—		$	3,289		$	1,573
	Balance, July 1, 2014	$	1,709		$	6		$	3,821		$	31,104
	Transfers into Level 3	—			—			—			—
	Transfers out of Level 3	—			—			—			—
	Total gains or losses (realized/unrealized):
	Included in earnings (1)	10			—			(842		)	(272		)
	Included in other comprehensive income	—			—			—			—
	Purchases, issuances, sales and settlements:
	Purchases	—			—			—			—
	Issuances	—			—			—			4,060
	Sales	—			—			—			—
	Settlements	—			—			—			—
	Balance, September 30, 2014	$	1,719		$	6		$	2,979		$	34,892
	Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at September 30, 2014	$	10		$	—		$	(842	)	$	(272	)
	-1	Included in noninterest income in the Unaudited Condensed Consolidated Statements of Income.
	The following table reconciles the assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
		Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	Nine Months Ended September 30,	Other Trading Assets			States and Political Subdivisions			Equity Securities			Interest Rate Contracts, net			Other Assets
		(In Thousands)
	Balance, January 1, 2013	$	2,083		$	8		$	6		$	5,016		$	13,255
	Transfers into Level 3	—			—			—			—			—
	Transfers out of Level 3	—			—			—			—			—
	Total gains or losses (realized/unrealized):
	Included in earnings (1)	(293		)	—			—			(1,194		)	1,808
	Included in other comprehensive income	—			—			—			—			—
	Purchases, issuances, sales and settlements:
	Purchases	—			—			—			—			—
	Issuances	—			—			—			—			13,998
	Sales	—			—			—			—			—
	Settlements	—			(8		)	—			—			—
	Balance, September 30, 2013	$	1,790		$	—		$	6		$	3,822		$	29,061
	Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at September 30, 2013	$	(293	)	$	—		$	—		$	(1,194	)	$	1,808
	Balance, January 1, 2014	$	1,645		$	—		$	6		$	890		$	30,065
	Transfers into Level 3	—			—			—			—			—
	Transfers out of Level 3	—			—			—			—			—
	Total gains or losses (realized/unrealized):
	Included in earnings (1)	74			—			—			2,089			(3,239		)
	Included in other comprehensive income	—			—			—			—			—
	Purchases, issuances, sales and settlements:
	Purchases	—			—			—			—			—
	Issuances	—			—			—			—			8,066
	Sales	—			—			—			—			—
	Settlements	—			—			—			—			—
	Balance, September 30, 2014	$	1,719		$	—		$	6		$	2,979		$	34,892
	Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at September 30, 2014	$	74		$	—		$	—		$	2,089		$	(3,239	)
	-1	Included in noninterest income in the Unaudited Condensed Consolidated Statements of Income.
Schedule of carrying amounts and estimated fair values within the fair value hierarchy	'
	The following table represents those assets that were subject to fair value adjustments during the three and nine months ended September 30, 2014 and 2013 and still held as of the end of the period, and the related gains and losses from fair value adjustments on assets sold during the period as well as assets still held as of the end of the period.
					Fair Value Measurements at the End of the Reporting Period Using
		Fair Value			Quoted Prices in Active Markets for Identical Assets			Significant Other Observable Inputs			Significant Unobservable Inputs			Total Gains (Losses)
		September 30, 2014			(Level 1)			(Level 2)			(Level 3)			Three Months Ended September 30, 2014			Nine Months Ended September 30, 2014
		(In Thousands)
	Nonrecurring fair value measurements
	Assets:
	Investment securities held to maturity	$	3,832		$	—		$	—		$	3,832		$	—		$	(180	)
	Impaired loans (1)	137,398			—			—			137,398			(2,362		)	(21,238		)
	OREO	17,058			—			—			17,058			(758		)	(2,340		)
					Fair Value Measurements at the End of the Reporting Period Using
		Fair Value			Quoted Prices in Active Markets for Identical Assets			Significant Other Observable Inputs			Significant Unobservable Inputs			Total Gains (Losses)
		September 30, 2013			(Level 1)			(Level 2)			(Level 3)			Three Months Ended September 30, 2013			Nine Months Ended September 30, 2013
		(In Thousands)
	Nonrecurring fair value measurements
	Assets:
	Investment securities held to maturity	$	2,793		$	—		$	—		$	2,793		$	(968	)	$	(1,430	)
	Loans held for sale	7,465			—			—			7,465			—			182
	Impaired loans (1)	160,659			—			—			160,659			(18,699		)	(36,872		)
	OREO	41,493			—			—			41,493			(2,184		)	3,396
	-1	Total gains (losses) represent charge-offs on impaired loans for which adjustments are based on the appraised value of the collateral.
Schedule of fair value measurement inputs	'
	The table below presents quantitative information about the significant unobservable inputs for material assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring and nonrecurring basis.
					Quantitative Information about Level 3 Fair Value Measurements
		Fair Value at						Range of Unobservable Inputs
		September 30, 2014			Valuation Technique		Unobservable Input(s)	(Weighted Average)
		(In Thousands)
	Recurring fair value measurements:
	Other trading assets	$	1,719		Discounted cash flow		Default rate	8.70%
							Prepayment rate	5.2% - 9.8% (6.9%)
	Interest rate contracts	2,979			Discounted cash flow		Closing ratios (pull-through)	8.4% - 98.7% (52.4%)
							Cap grids	0.4% - 2.5% (1.0%)
	Other assets - MSRs	34,892			Discounted cash flow		Discount rate	10.0% - 11.0% (10.1%)
							Constant prepayment rate or life speed	6.1% - 53.4% (10.0%)
							Cost to service	62.3% - 749.0% (66.0%)
	Nonrecurring fair value measurements:
	Investment securities held to maturity	$	3,832		Discounted cash flow		Prepayment rate	5.8% - 6.5% (6.2%)
							Default rate	8.0% - 9.2% (8.6%)
							Loss severity	51.3% - 93.0% (72.2%)
	Impaired loans	137,398			Appraised value		Appraised value	0.0% - 100.0% (32.2%)
	OREO	17,058			Appraised value		Appraised value	8.00%
Schedule of fair value by balance sheet location	'
	The carrying amounts and estimated fair values, as well as the level within the fair value hierarchy, of the Company’s financial instruments are as follows:
		September 30, 2014
		Carrying Amount			Estimated Fair Value			Level 1			Level 2			Level 3
		(In Thousands)
	Financial Instruments:
	Assets:
	Cash and cash equivalents	$	4,915,534		$	4,915,534		$	4,915,534		$	—		$	—
	Trading account assets	515,136			515,136			244,718			268,699			1,719
	Investment securities available for sale	9,326,413			9,326,413			462,860			8,378,597			484,956
	Investment securities held to maturity	1,417,985			1,330,538			—			—			1,330,538
	Loans held for sale	190,882			190,882			—			190,882			—
	Loans, net	54,313,355			52,363,208			—			—			52,363,208
	Derivative assets	149,518			149,518			—			146,537			2,981
	Other assets	34,892			34,892			—			—			34,892
	Liabilities:
	Deposits	$	60,270,958		$	60,325,222		$	—		$	60,325,222		$	—
	FHLB and other borrowings	4,551,050			4,529,351			—			4,529,351			—
	Federal funds purchased and securities sold under agreements to repurchase	809,053			809,053			—			809,053			—
	Other short-term borrowings	246,835			246,835			—			246,835			—
	Trading account liabilities	449,401			449,401			245,742			203,659			—
	Derivative liabilities	86,400			86,400			—			86,398			2
		December 31, 2013
		Carrying Amount			Estimated Fair Value			Level 1			Level 2			Level 3
		(In Thousands)
	Financial Instruments:
	Assets:
	Cash and cash equivalents	$	3,598,460		$	3,598,460		$	3,598,460		$	—		$	—
	Trading account assets	319,930			319,930			—			318,285			1,645
	Investment securities available for sale	8,313,085			8,313,085			40,340			7,760,612			512,133
	Investment securities held to maturity	1,519,196			1,405,258			—			—			1,405,258
	Loans held for sale	147,109			147,109			—			139,750			7,359
	Loans, net	49,966,297			47,822,339			—			—			47,822,339
	Derivative assets	122,951			122,951			—			122,004			947
	Other assets	30,065			30,065			—			—			30,065
	Liabilities:
	Deposits	$	54,437,490		$	54,492,651		$	—		$	54,492,651		$	—
	FHLB and other borrowings	4,298,707			4,287,220			—			4,287,220			—
	Federal funds purchased and securities sold under agreements to repurchase	852,570			852,570			—			852,570			—
	Other short-term borrowings	5,591			5,591			—			5,591			—
	Trading account liabilities	228,757			228,757			—			228,757			—
	Derivative liabilities	61,294			61,294			—			61,237			57

Comprehensive_Income_Tables

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Change in components of other comprehensive income (loss)	'
	The following summarizes the change in the components of other comprehensive income (loss).
		Three Months Ended September 30,
		2014												2013
		Pretax				Tax Expense/ (Benefit)				After-tax				Pretax				Tax Expense/ (Benefit)			After-tax
		(In Thousands)
	Other comprehensive income (loss):
	Unrealized holding gains (losses) arising during period from securities available for sale	$	(17,597	)		$	(6,325	)		$	(11,272	)		$	(12,546	)		$	(4,602	)	$	(7,944	)
	Less: reclassification adjustment for net gains on sale of securities in net income	9,710				3,490				6,220				—				—			—
	Net change in unrealized gains (losses) on securities available for sale	(27,307		)		(9,815		)		(17,492		)		(12,546		)		(4,602		)	(7,944		)
	Change in unamortized net holding losses on investment securities held to maturity	3,745				1,347				2,398				3,218				1,178			2,040
	Less: non-credit related impairment on investment securities held to maturity	—				—				—				—				—			—
	Change in unamortized non-credit related impairment on investment securities held to maturity	387				138				249				269				98			171
	Net change in unamortized holding losses on securities held to maturity	4,132				1,485				2,647				3,487				1,276			2,211
	Unrealized holding gains (losses) arising during period from cash flow hedge instruments	(1,103		)		(397		)		(706		)		356				130			226
	Change in defined benefit plans	—				—				—				1				—			1
	Other comprehensive income (loss)	$	(24,278	)		$	(8,727	)		$	(15,551	)		$	(8,702	)		$	(3,196	)	$	(5,506	)
		Nine Months Ended September 30,
		2014												2013
		Pretax				Tax Expense/ (Benefit)				After-tax				Pretax				Tax Expense/ (Benefit)			After-tax
		(In Thousands)
	Other comprehensive income (loss):
	Unrealized holding gains (losses) arising during period from securities available for sale	$	63,819			$	22,936			$	40,883			$	(158,157	)		$	(57,896	)	$	(100,261	)
	Less: reclassification adjustment for net gains on sale of securities in net income	47,608				17,110				30,498				33,030				12,089			20,941
	Net change in unrealized gains (losses) on securities available for sale	16,211				5,826				10,385				(191,187		)		(69,985		)	(121,202		)
	Change in unamortized net holding losses on investment securities held to maturity	11,213				4,030				7,183				12,753				4,668			8,085
	Less: non-credit related impairment on investment securities held to maturity	235				84				151				2,288				838			1,450
	Change in unamortized non-credit related impairment on investment securities held to maturity	1,141				409				732				1,982				725			1,257
	Net change in unamortized holding losses on securities held to maturity	12,119				4,355				7,764				12,447				4,555			7,892
	Unrealized holding gains (losses) arising during period from cash flow hedge instruments	(3,729		)		(1,341		)		(2,388		)		10,198				3,707			6,491
	Change in defined benefit plans	(2,672		)		(1,001		)		(1,671		)		1,018				337			681
	Other comprehensive income (loss)	$	21,929			$	7,839			$	14,090			$	(167,524	)		$	(61,386	)	$	(106,138	)
Schedule of accumulated other comprehensive income (loss)	'
	Activity in accumulated other comprehensive income (loss), net of tax was as follows:
		Unrealized Gains (Losses) on Securities Available for Sale and Transferred to Held to Maturity				Accumulated (Gains) Losses on Cash Flow Hedging Instruments				Defined Benefit Plan Adjustment				Unamortized Impairment Losses on Investment Securities Held to Maturity				Total
		(In Thousands)
	Balance, January 1, 2013	$	86,379			$	(13,387	)		$	(38,243	)		$	(8,691	)		$	26,058
	Other comprehensive income (loss) before reclassifications	(100,261		)		4,072				—				(1,450		)		(97,639		)
	Amounts reclassified from accumulated other comprehensive income (loss)	(12,856		)		2,419				681				1,257				(8,499		)
	Net current period other comprehensive income (loss)	(113,117		)		6,491				681				(193		)		(106,138		)
	Balance, September 30, 2013	$	(26,738	)		$	(6,896	)		$	(37,562	)		$	(8,884	)		$	(80,080	)
	Balance, January 1, 2014	$	(31,490	)		$	(5,289	)		$	(41,921	)		$	(9,236	)		$	(87,936	)
	Other comprehensive income (loss) before reclassifications	40,883				(3,521		)		—				(151		)		37,211
	Amounts reclassified from accumulated other comprehensive income (loss)	(23,315		)		1,133				(1,671		)		732				(23,121		)
	Net current period other comprehensive income (loss)	17,568				(2,388		)		(1,671		)		581				14,090
	Balance, September 30, 2014	$	(13,922	)		$	(7,677	)		$	(43,592	)		$	(8,655	)		$	(73,846	)
Schedule of reclassifications out of accumulated other comprehensive income	'
	The following table presents information on reclassifications out of accumulated other comprehensive income.
	Details About Accumulated Other Comprehensive Income Components		Amounts Reclassified From Accumulated Other Comprehensive Income (1)																Condensed Consolidated Statement of Income Caption
			Three Months Ended September 30,								Nine Months Ended September 30,
			2014				2013				2014				2013
			(In Thousands)
	Unrealized Gains (Losses) on Securities Available for Sale and Transferred to Held to Maturity		$	9,710			$	—			$	47,608			$	33,030			Investment securities gains, net
			(3,745		)		(3,218		)		(11,213		)		(12,753		)		Interest on investment securities held to maturity
			5,965				(3,218		)		36,395				20,277
			(2,143		)		1,178				(13,080		)		(7,421		)		Income tax (expense) benefit
			$	3,822			$	(2,040	)		$	23,315			$	12,856			Net of tax
	Accumulated (Gains) Losses on Cash Flow Hedging Instruments		$	1,727			$	216			$	3,551			$	1,396			Interest and fees on loans
			(1,768		)		(1,740		)		(5,319		)		(5,196		)		Interest and fees on FHLB advances
			(41		)		(1,524		)		(1,768		)		(3,800		)
			15				554				635				1,381				Income tax benefit
			$	(26	)		$	(970	)		$	(1,133	)		$	(2,419	)		Net of tax
	Defined Benefit Plan Adjustment		$	—			$	—			$	2,672			$	(1,018	)		-2
			—				—				(1,001		)		337				Income tax (expense) benefit
			$	—			$	—			$	1,671			$	(681	)		Net of tax
	Unamortized Impairment Losses on Investment Securities Held to Maturity		$	(387	)		$	(269	)		$	(1,141	)		$	(1,982	)		Interest on investment securities held to maturity
			138				98				409				725				Income tax benefit
			$	(249	)		$	(171	)		$	(732	)		$	(1,257	)		Net of tax
	-1	Amounts in parentheses indicate debits to the consolidated statement of income.
	-2	These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 18, Benefit Plans, in the Notes to the December 31, 2013, Consolidated Financial Statements for additional details).

Supplemental_Disclosure_for_St1

Supplemental Disclosure for Statement of Cash Flows (Tables)	9 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]	'
Schedule of supplemental cash flow disclosures	'
	The following table presents the Company’s supplemental disclosures for statement of cash flows.
		Nine Months Ended September 30,
		2014			2013
		(In Thousands)
	Supplemental disclosures of cash flow information:
	Interest paid	$	202,851		$	197,911
	Net income taxes paid	95,167			87,838
	Supplemental schedule of noncash investing and financing activities:
	Transfer of loans and loans held for sale to OREO	$	14,278		$	39,165
	Transfer of loans to loans held for sale	14,129			55,000
	Change in unrealized gain (loss) on available for sale securities	16,211			(191,187		)
	Issuance of restricted stock, net of cancellations	(1,060		)	(596		)
	Business combinations:
	Assets acquired	117,068			—
	Liabilities assumed	18,329			—

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Schedule of segment reporting information	'
	The following tables present the segment information for the Company’s segments.
		Three Months Ended September 30, 2014
		Wealth and Retail Banking		Commercial Banking			Corporate and Investment Banking		Treasury			Corporate Support and Other			Consolidated
		(In Thousands)
	Net interest income	$	209,186	$	212,448		$	14,804	$	711		$	44,819		$	481,968
	Allocated provision for loan losses	15,036		(5,136		)	3,549		—			(9,580		)	3,869
	Noninterest income	172,579		58,410			41,465		16,045			(62,068		)	226,431
	Noninterest expense	324,001		117,615			38,318		5,093			48,115			533,142
	Net income (loss) before income tax expense (benefit)	42,728		158,379			14,402		11,663			(55,784		)	171,388
	Income tax expense (benefit)	15,916		58,996			5,364		4,345			(56,851		)	27,770
	Net income (loss)	26,812		99,383			9,038		7,318			1,067			143,618
	Less: net income attributable to noncontrolling interests	—		382			—		433			—			815
	Net income (loss) attributable to shareholder	$	26,812	$	99,001		$	9,038	$	6,885		$	1,067		$	142,803
	Average assets	$	22,655,312	$	30,431,008		$	4,678,475	$	13,238,660		$	6,905,632		$	77,909,087
		Three Months Ended September 30, 2013
		Wealth and Retail Banking		Commercial Banking			Corporate and Investment Banking		Treasury			Corporate Support and Other			Consolidated
		(In Thousands)
	Net interest income (expense)	$	204,443	$	193,141		$	12,356	$	(3,451	)	$	95,422		$	501,911
	Allocated provision for loan losses	35,856		1,160			593		(38		)	(37		)	37,534
	Noninterest income	160,531		59,988			43,548		7,598			(60,680		)	210,985
	Noninterest expense	319,140		111,898			29,626		4,428			57,047			522,139
	Net income (loss) before income tax expense (benefit)	9,978		140,071			25,685		(243		)	(22,268		)	153,223
	Income tax expense (benefit)	3,716		52,176			9,568		(91		)	(23,439		)	41,930
	Net income (loss)	6,262		87,895			16,117		(152		)	1,171			111,293
	Less: net income attributable to noncontrolling interests	—		208			—		439			—			647
	Net income (loss) attributable to shareholder	$	6,262	$	87,687		$	16,117	$	(591	)	$	1,171		$	110,646
	Average assets	$	21,061,941	$	26,552,591		$	3,236,952	$	11,363,589		$	7,110,270		$	69,325,343
		Nine Months Ended September 30, 2014
		Wealth and Retail Banking		Commercial Banking			Corporate and Investment Banking		Treasury			Corporate Support and Other			Consolidated
		(In Thousands)
	Net interest income	$	623,347	$	622,085		$	42,802	$	4,072		$	183,735		$	1,476,041
	Allocated provision for loan losses	68,103		27,939			1,504		—			(11,159		)	86,387
	Noninterest income	496,759		184,708			125,519		63,815			(189,597		)	681,204
	Noninterest expense	957,165		355,760			105,097		12,130			167,119			1,597,271
	Net income (loss) before income tax expense (benefit)	94,838		423,094			61,720		55,757			(161,822		)	473,587
	Income tax expense (benefit)	35,327		157,603			22,991		20,770			(129,224		)	107,467
	Net income (loss)	59,511		265,491			38,729		34,987			(32,598		)	366,120
	Less: net income attributable to noncontrolling interests	—		464			—		1,308			—			1,772
	Net income (loss) attributable to shareholder	$	59,511	$	265,027		$	38,729	$	33,679		$	(32,598	)	$	364,348
	Average assets	$	22,173,516	$	29,589,172		$	4,344,414	$	12,773,685		$	6,893,604		$	75,774,391
		Nine Months Ended September 30, 2013
		Wealth and Retail Banking		Commercial Banking			Corporate and Investment Banking		Treasury			Corporate Support and Other			Consolidated
		(In Thousands)
	Net interest income (expense)	$	610,148	$	561,075		$	38,657	$	(32,167	)	$	357,459		$	1,535,172
	Allocated provision for loan losses	87,176		(12,571		)	2,817		—			3,964			81,386
	Noninterest income	480,353		171,273			101,882		74,520			(162,653		)	665,375
	Noninterest expense	955,056		329,320			89,442		11,399			237,287			1,622,504
	Net income (loss) before income tax expense (benefit)	48,269		415,599			48,280		30,954			(46,445		)	496,657
	Income tax expense (benefit)	17,980		154,810			17,984		11,530			(56,271		)	146,033
	Net income (loss)	30,289		260,789			30,296		19,424			9,826			350,624
	Less: net income attributable to noncontrolling interests	—		283			—		1,325			—			1,608
	Net income (loss) attributable to shareholder	$	30,289	$	260,506		$	30,296	$	18,099		$	9,826		$	349,016
	Average assets	$	20,774,537	$	25,330,361		$	3,090,200	$	13,385,470		$	7,125,867		$	69,706,435

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Schedule of derivative contracts between the Company and BBVA	'
	The net fair value of outstanding derivative contracts between the Company and BBVA are detailed below.
		September 30, 2014			December 31, 2013
		(In Thousands)
	Derivative contracts
	Cash flow hedges	$	2,234		$	3,652
	Free-standing derivative instruments – risk management and other purposes	41,606			21,650
	Free-standing derivative instruments – customer accommodation	(10,905		)	(842		)
	Securities Purchased Under Agreement to Resell/ Securities Sold Under Agreement to Repurchase
	The Company enters into agreements with BBVA as the counterparty under which it purchases/sells securities subject to an obligation to resell/repurchase the same or similar securities. The following represents the amount of securities purchased under agreement to resell and securities sold under agreement to repurchase where BBVA is the counterparty.
		September 30, 2014			December 31, 2013
		(In Thousands)
	Securities purchased under agreement to resell	$	248,622		$	—
	Securities sold under agreement to repurchase	219,973			—

Acquisition_Activities_Details

Acquisition Activities (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Mar. 20, 2014	Sep. 30, 2014
			Simple	Simple
Business Acquisition [Line Items]	'	'	'	'
Assets acquired	'	'	$17,000,000	'
Liabilities assumed	'	'	2,000,000	'
Goodwill acquired	5,060,924,000	4,971,645,000	91,000,000	'
Other intangible assets acquired	'	'	13,000,000	'
Cash consideration paid	'	'	98,000,000	'
Contingent consideration paid	'	'	16,000,000	'
Acquisition related costs in noninterest expense	'	'	'	$3,500,000

Investment_Securities_Availabl2

Investment Securities Available for Sale and Investment Securities Held to Maturity - Adjusted cost and fair value of securities (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	$9,306,221	$8,309,104
Available-for-sale Securities, Gross Unrealized Gain	90,274	111,684
Available-for-sale Securities, Gross Unrealized Losses	70,082	107,703
Investment securities available for sale	9,326,413	8,313,085
Held-to-maturity Securities, Amortized Cost Basis	1,417,985	1,519,196
Held-to-maturity Securities, Gross Unrealized Gain	18,706	37,890
Held-to-maturity Securities, Gross Unrealized Losses	106,153	151,828
Investment Securities - Fair Value	1,330,538	1,405,258
US Treasury and other US Government Agencies	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	1,219,222	257,844
Available-for-sale Securities, Gross Unrealized Gain	4,363	4,338
Available-for-sale Securities, Gross Unrealized Losses	10,004	1,245
Investment securities available for sale	1,213,581	260,937
Mortgage-backed securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	4,685,339	5,232,504
Available-for-sale Securities, Gross Unrealized Gain	58,800	75,912
Available-for-sale Securities, Gross Unrealized Losses	49,740	74,625
Investment securities available for sale	4,694,399	5,233,791
Collateralized mortgage obligations	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	2,404,672	1,747,450
Available-for-sale Securities, Gross Unrealized Gain	18,224	23,312
Available-for-sale Securities, Gross Unrealized Losses	7,386	14,364
Investment securities available for sale	2,415,510	1,756,398
Held-to-maturity Securities, Amortized Cost Basis	130,442	145,989
Held-to-maturity Securities, Gross Unrealized Gain	6,657	19,848
Held-to-maturity Securities, Gross Unrealized Losses	5,362	3,900
Investment Securities - Fair Value	131,737	161,937
State and political subdivisions	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	483,016	518,755
Available-for-sale Securities, Gross Unrealized Gain	8,690	8,041
Available-for-sale Securities, Gross Unrealized Losses	2,919	17,360
Investment securities available for sale	488,787	509,436
Held-to-maturity Securities, Amortized Cost Basis	1,167,183	1,225,977
Held-to-maturity Securities, Gross Unrealized Gain	1,455	843
Held-to-maturity Securities, Gross Unrealized Losses	98,423	139,816
Investment Securities - Fair Value	1,070,215	1,087,004
Other	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	29,014	40,415
Available-for-sale Securities, Gross Unrealized Gain	146	27
Available-for-sale Securities, Gross Unrealized Losses	33	109
Investment securities available for sale	29,127	40,333
Held-to-maturity Securities, Amortized Cost Basis	77,207	79,640
Held-to-maturity Securities, Gross Unrealized Gain	6,847	13,191
Held-to-maturity Securities, Gross Unrealized Losses	0	1,929
Investment Securities - Fair Value	84,054	90,902
Equity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	484,958	512,136
Available-for-sale Securities, Gross Unrealized Gain	51	54
Available-for-sale Securities, Gross Unrealized Losses	0	0
Investment securities available for sale	485,009	512,190
Asset-backed securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Held-to-maturity Securities, Amortized Cost Basis	43,153	67,590
Held-to-maturity Securities, Gross Unrealized Gain	3,747	4,008
Held-to-maturity Securities, Gross Unrealized Losses	2,368	6,183
Investment Securities - Fair Value	$44,532	$65,415

Investment_Securities_Availabl3

Investment Securities Available for Sale and Investment Securities Held to Maturity - Fair value and unrealized losses of available for sale securities and held to maturity securities (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, securities in a loss position for less than 12 months, fair value	$1,932,447	$3,451,797
Available-for-sale securities, securities in a loss position for less than 12 months, unrealized losses	14,674	89,640
Available-for-sale securities, securities in a loss position for 12 months or longer, fair value	2,461,264	540,565
Available-for-sale securities, Securities in a loss position for 12 months or longer, unrealized losses	55,408	18,063
Available-for-sale securities, fair value	4,393,711	3,992,362
Available-for-sale securities, unrealized losses	70,082	107,703
Held-to-maturity securities, securities in a loss position for less than 12 months, fair value	38,971	314,904
Held-to-maturity securities, securities in a loss position for less than 12 months, unrealized losses	1,083	26,777
Held-to-maturity securities, securities in a loss position for 12 months or longer, fair value	936,041	713,131
Held-to-maturity securities, securities in a loss position for 12 months or longer, unrealized losses	105,070	125,051
Held-to-maturity securities, fair value	975,012	1,028,035
Held-to-maturity securities unrealized losses	106,153	151,828
US Treasury and government agency	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, securities in a loss position for less than 12 months, fair value	693,763	119,871
Available-for-sale securities, securities in a loss position for less than 12 months, unrealized losses	8,863	1,245
Available-for-sale securities, securities in a loss position for 12 months or longer, fair value	37,917	0
Available-for-sale securities, Securities in a loss position for 12 months or longer, unrealized losses	1,141	0
Available-for-sale securities, fair value	731,680	119,871
Available-for-sale securities, unrealized losses	10,004	1,245
Mortgage backed securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, securities in a loss position for less than 12 months, fair value	428,804	2,462,822
Available-for-sale securities, securities in a loss position for less than 12 months, unrealized losses	1,281	69,919
Available-for-sale securities, securities in a loss position for 12 months or longer, fair value	2,101,846	339,448
Available-for-sale securities, Securities in a loss position for 12 months or longer, unrealized losses	48,459	4,706
Available-for-sale securities, fair value	2,530,650	2,802,270
Available-for-sale securities, unrealized losses	49,740	74,625
Asset-backed securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Held-to-maturity securities, securities in a loss position for less than 12 months, fair value	4,677	0
Held-to-maturity securities, securities in a loss position for less than 12 months, unrealized losses	48	0
Held-to-maturity securities, securities in a loss position for 12 months or longer, fair value	25,145	33,362
Held-to-maturity securities, securities in a loss position for 12 months or longer, unrealized losses	2,320	6,183
Held-to-maturity securities, fair value	29,822	33,362
Held-to-maturity securities unrealized losses	2,368	6,183
Collateralized mortgage obligations	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, securities in a loss position for less than 12 months, fair value	766,153	699,693
Available-for-sale securities, securities in a loss position for less than 12 months, unrealized losses	4,410	9,123
Available-for-sale securities, securities in a loss position for 12 months or longer, fair value	160,757	108,710
Available-for-sale securities, Securities in a loss position for 12 months or longer, unrealized losses	2,976	5,241
Available-for-sale securities, fair value	926,910	808,403
Available-for-sale securities, unrealized losses	7,386	14,364
Held-to-maturity securities, securities in a loss position for less than 12 months, fair value	25,551	1,466
Held-to-maturity securities, securities in a loss position for less than 12 months, unrealized losses	1,000	17
Held-to-maturity securities, securities in a loss position for 12 months or longer, fair value	30,035	32,370
Held-to-maturity securities, securities in a loss position for 12 months or longer, unrealized losses	4,362	3,883
Held-to-maturity securities, fair value	55,586	33,836
Held-to-maturity securities unrealized losses	5,362	3,900
State and political subdivisions	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, securities in a loss position for less than 12 months, fair value	39,804	164,472
Available-for-sale securities, securities in a loss position for less than 12 months, unrealized losses	116	9,244
Available-for-sale securities, securities in a loss position for 12 months or longer, fair value	159,652	92,407
Available-for-sale securities, Securities in a loss position for 12 months or longer, unrealized losses	2,803	8,116
Available-for-sale securities, fair value	199,456	256,879
Available-for-sale securities, unrealized losses	2,919	17,360
Held-to-maturity securities, securities in a loss position for less than 12 months, fair value	8,743	313,438
Held-to-maturity securities, securities in a loss position for less than 12 months, unrealized losses	35	26,760
Held-to-maturity securities, securities in a loss position for 12 months or longer, fair value	880,861	642,799
Held-to-maturity securities, securities in a loss position for 12 months or longer, unrealized losses	98,388	113,056
Held-to-maturity securities, fair value	889,604	956,237
Held-to-maturity securities unrealized losses	98,423	139,816
Other	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, securities in a loss position for less than 12 months, fair value	3,923	4,939
Available-for-sale securities, securities in a loss position for less than 12 months, unrealized losses	4	109
Available-for-sale securities, securities in a loss position for 12 months or longer, fair value	1,092	0
Available-for-sale securities, Securities in a loss position for 12 months or longer, unrealized losses	29	0
Available-for-sale securities, fair value	5,015	4,939
Available-for-sale securities, unrealized losses	33	109
Held-to-maturity securities, securities in a loss position for less than 12 months, fair value	0	0
Held-to-maturity securities, securities in a loss position for less than 12 months, unrealized losses	0	0
Held-to-maturity securities, securities in a loss position for 12 months or longer, fair value	0	4,600
Held-to-maturity securities, securities in a loss position for 12 months or longer, unrealized losses	0	1,929
Held-to-maturity securities, fair value	0	4,600
Held-to-maturity securities unrealized losses	$0	$1,929

Investment_Securities_Availabl4

Investment Securities Available for Sale and Investment Securities Held to Maturity - Other temporary impairments losses recognized in other comprehensive income (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]	'	'	'	'
Other than temporary impairment recognized in other comprehensive income, beginning of period	$21,123	$17,541	$20,943	$17,318
Reductions for securities paid off during the period (realized)	0	0	0	-239
Additions for the credit component on debt securities in which OTTI was not previously recognized	0	0	0	0
Additions for the credit component on debt securities in which OTTI was previously recognized	0	968	180	1,430
Other than temporary impairment recognized in other comprehensive income, end of period	$21,123	$18,509	$21,123	$18,509

Investment_Securities_Availabl5

Investment Securities Available for Sale and Investment Securities Held to Maturity - Maturities of securities portfolios (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment securities available for sale, amortized cost [Abstract]	'	'
Maturing within one year	$55,034	'
Maturing after one but within five years	304,190	'
Maturing after five both within ten years	454,373	'
Maturing after ten years	917,655	'
Total single date maturities	1,731,252	'
Mortgage-backed securities and collateralized mortgage obligations	7,090,011	'
Available-for-sale Securities, Amortized Cost Basis	9,306,221	8,309,104
Investment securities available for sale, fair value [Abstract]	'	'
Maturing within one year	56,026	'
Maturing after one but within five years	307,836	'
Maturing after five but within ten years	457,511	'
Maturing after ten years	910,122	'
Total single date maturities	1,731,495	'
Mortgage-backed securities and collateralized mortgage obligations	7,109,909	'
Investment securities available for sale	9,326,413	8,313,085
Held-to-maturity securities, amortized cost [Abstract]	'	'
Maturing within one year	31,388	'
Maturing after one but within five years	318,323	'
Maturing after five but within ten years	195,466	'
Maturing after ten years	742,366	'
Total single date maturities	1,287,543	'
Collateralized mortgage obligations	130,442	'
Total	1,417,985	1,519,196
Held-to-maturity securities, fair value [Abstract]	'	'
Maturing within one year	31,168	'
Maturing after one but within five years	300,768	'
Maturing after five but within ten years	187,126	'
Maturing after ten years	679,739	'
Total single date maturities	1,198,801	'
Collateralized mortgage obligations	131,737	'
Total Investments Securities Held to Maturity	1,330,538	1,405,258
Equity securities	'	'
Investment securities available for sale, amortized cost [Abstract]	'	'
Available-for-sale Securities, Amortized Cost Basis	484,958	512,136
Investment securities available for sale, fair value [Abstract]	'	'
Investment securities available for sale	$485,009	$512,190

Investment_Securities_Availabl6

Investment Securities Available for Sale and Investment Securities Held to Maturity - Gross Realized Gains and Losses (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]	'	'	'	'
Gross gains	$9,710	$0	$47,608	$33,030
Gross losses	0	0	0	0
Net realized gains	$9,710	$0	$47,608	$33,030

Investment_Securities_Availabl7

Investment Securities Available for Sale and Investment Securities Held to Maturity - Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'	'	'	'	'
Federal home loan bank and federal reserve stock carried at par value	$485,000,000	'	$485,000,000	'	$512,000,000
Securities impairment	$0	$968,000	$180,000	$1,430,000	'

Loans_and_Allowance_for_Loan_L2

Loans and Allowance for Loan Losses - Composition of loan portfolio (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commercial loans:	'	'
Commercial, financial and agricultural	$22,510,956	$20,209,209
Real estate – construction	1,977,784	1,736,348
Commercial real estate – mortgage	9,498,561	9,106,329
Total commercial loans	33,987,301	31,051,886
Consumer loans:	'	'
Residential real estate – mortgage	13,606,816	12,706,879
Equity lines of credit	2,259,561	2,236,367
Equity loans	629,047	644,068
Credit card	631,000	660,073
Consumer – direct	609,980	516,572
Consumer – indirect	2,704,772	2,116,981
Total consumer loans	20,441,176	18,880,940
Covered loans	580,756	734,190
Total loans	$55,009,233	$50,667,016

Loans_and_Allowance_for_Loan_L3

Loans and Allowance for Loan Losses - Purchased Impaired Loans (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Receivables [Abstract]	'	'
Unpaid principal balance	$393,351	$449,429
Discount	-24,092	-60,069
Allowance for loan losses	-4,198	-243
Carrying value	$365,061	$389,117

Loans_and_Allowance_for_Loan_L4

Loans and Allowance for Loan Losses - Accretable yields on purchased impaired loans (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]	'	'
Balance, beginning of period	$105,698	$136,992
Transfer (to) from nonaccretable difference	7,229	32,831
Accretion	-39,925	-49,916
Other	0	1,516
Balance, end of period	$73,002	$121,423

Loans_and_Allowances_for_Loan_

Loans and Allowances for Loan Losses - Purchased Nonimpaired Loans (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Receivables [Abstract]	'	'
Unpaid principal balance	$337,255	$520,723
Discount	-125,758	-175,893
Allowance for loan losses	-2,408	-2,711
Carrying value	$209,089	$342,119

Loans_and_Allowance_for_Loan_L5

Loans and Allowance for Loan Losses - Recorded investment in all purchased impaired and purchased nonimpaired loans (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'		'
Purchased Impaired Loans	$369,259		$389,360
Purchased nonimpaired loans	211,497		344,830
Total Covered Loans	580,756		734,190
Commercial, financial and agricultural	'		'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'		'
Purchased Impaired Loans	0		0
Purchased nonimpaired loans	45,450		40,892
Total Covered Loans	45,450		40,892
Commercial real estate	'		'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'		'
Purchased Impaired Loans	0	[1]	4,760	[1]
Purchased nonimpaired loans	21,220	[1]	141,333	[1]
Total Covered Loans	21,220	[1]	146,093	[1]
Residential real estate - mortgage	'		'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'		'
Purchased Impaired Loans	369,259	[2]	384,588	[2]
Purchased nonimpaired loans	138,550	[2]	155,452	[2]
Total Covered Loans	507,809	[2]	540,040	[2]
Consumer loans	'		'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'		'
Purchased Impaired Loans	0		12
Purchased nonimpaired loans	6,277		7,153
Total Covered Loans	$6,277		$7,165
[1]	Includes real estate – construction and commercial real estate - mortgage.
[2]	Includes residential real estate – mortgage, equity lines of credit and equity loans

Loans_and_Allowance_for_Loan_L6

Loans and Allowance for Loan Losses - FDIC Indemnification Asset (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
FDIC Indemnification Asset [Roll Forward]	'	'
Beginning balance	$24,315	$271,928
Increase (decrease) due to credit loss provision (benefit) recorded on FDIC covered loans	5,374	-8,489
Amortization and accretion, net	-82,277	-199,021
Payments to FDIC for covered assets	13,863	20,323
Other	-3,833	-4,196
Ending balance	($42,558)	$80,545

Loans_and_Allowance_for_Loan_L7

Loans and Allowance for Loan Losses - Allowances for loan losses activity (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'		'		'		'		'
Allowance for loan losses, covered, beginning of period	$11,551		$8,215		$2,954		$17,803		'
Allowance for loan losses, total loans, beginning of period	714,760		723,511		700,719		802,853		'
Provision charged to income, covered	-4,241		-2,424		550		-10,111		'
Provision charged to income, total loans	3,869		37,534		86,387		81,386		'
Loans charged off, covered	-1,124		-3,019		-2,131		-6,444		'
Loans charged off, total loans	-35,449		-59,047		-138,800		-220,789		'
Loan recoveries, covered	420		1,144		5,233		2,668		'
Loan recoveries, total loans	12,698		15,939		47,572		54,487		'
Net charge offs, covered	-704		-1,875		3,102		-3,776		'
Net charge offs, total loans	-22,751		-43,108		-91,228		-166,302		'
Allowance for loan losses, covered, end of period	6,606		3,916		6,606		3,916		'
Allowance for loan losses, total loans, end of period	695,878		717,937		695,878		717,937		'
Ending Balance of Allowance Attributable to Loans [Abstract]	'		'		'		'		'
Individually evaluated for impairment	67,737		'		67,737		'		81,751
Collectively evaluated for impairment	621,535		'		621,535		'		616,014
Covered purchased impaired	4,198		'		4,198		'		243
Covered purchased nonimpaired	2,408		'		2,408		'		2,711
Ending Balance of Loans [Abstract]	'		'		'		'		'
Individually evaluated for impairment	378,591		'		378,591		'		503,993
Collectively evaluated for impairment	54,049,886		'		54,049,886		'		49,428,833
Purchased Impaired Loans	369,259		'		369,259		'		389,360
Purchased nonimpaired loans	211,497		'		211,497		'		344,830
Covered loans	580,756		'		580,756		'		734,190
Total loans	55,009,233		'		55,009,233		'		50,667,016
Commercial, financial and agricultural	'		'		'		'		'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'		'		'		'		'
Allowance for loan losses, beginning of period	317,790		290,188		292,327		283,058		'
Provision charged to income	-6,889		16,690		30,107		37,167		'
Loans charged off	-3,404		-7,833		-23,855		-31,044		'
Loan recoveries	3,818		3,685		12,736		13,549		'
Net charge offs	414		-4,148		-11,119		-17,495		'
Allowance for loan losses, end of period	311,315		302,730		311,315		302,730		'
Ending Balance of Allowance Attributable to Loans [Abstract]	'		'		'		'		'
Individually evaluated for impairment	20,620		'		20,620		'		28,828
Collectively evaluated for impairment	290,695		'		290,695		'		263,499
Ending Balance of Loans [Abstract]	'		'		'		'		'
Individually evaluated for impairment	70,086		'		70,086		'		138,047
Collectively evaluated for impairment	22,440,870		'		22,440,870		'		20,071,162
Purchased Impaired Loans	0		'		0		'		0
Purchased nonimpaired loans	45,450		'		45,450		'		40,892
Total loans, excluding covered loans	22,510,956		'		22,510,956		'		20,209,209
Covered loans	45,450		'		45,450		'		40,892
Commercial real estate	'		'		'		'		'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'		'		'		'		'
Allowance for loan losses, beginning of period	142,941	[1]	182,613	[1]	158,960	[1]	254,324	[1]	'
Provision charged to income	-8,180	[1]	-13,901	[1]	-17,959	[1]	-70,315	[1]	'
Loans charged off	-555	[1]	-6,525	[1]	-10,506	[1]	-34,268	[1]	'
Loan recoveries	1,285	[1]	3,120	[1]	4,996	[1]	15,566	[1]	'
Net charge offs	730	[1]	-3,405	[1]	-5,510	[1]	-18,702	[1]	'
Allowance for loan losses, end of period	135,491	[1]	165,307	[1]	135,491	[1]	165,307	[1]	'
Ending Balance of Allowance Attributable to Loans [Abstract]	'		'		'		'		'
Individually evaluated for impairment	6,403	[1]	'		6,403	[1]	'		9,408	[1]
Collectively evaluated for impairment	129,088	[1]	'		129,088	[1]	'		149,552	[1]
Ending Balance of Loans [Abstract]	'		'		'		'		'
Individually evaluated for impairment	114,165	[1]	'		114,165	[1]	'		167,598	[1]
Collectively evaluated for impairment	11,362,180	[1]	'		11,362,180	[1]	'		10,675,079	[1]
Purchased Impaired Loans	0	[2]	'		0	[2]	'		4,760	[2]
Purchased nonimpaired loans	21,220	[2]	'		21,220	[2]	'		141,333	[2]
Total loans, excluding covered loans	11,476,345	[1]	'		11,476,345	[1]	'		10,842,677	[1]
Covered loans	21,220	[2]	'		21,220	[2]	'		146,093	[2]
Residential real estate	'		'		'		'		'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'		'		'		'		'
Allowance for loan losses, beginning of period	153,694	[3]	158,793	[3]	155,575	[3]	172,265	[3]	'
Provision charged to income	6,963	[3]	19,862	[3]	27,675	[3]	73,709	[3]	'
Loans charged off	-9,852	[3]	-23,996	[3]	-39,421	[3]	-96,289	[3]	'
Loan recoveries	3,266	[3]	3,926	[3]	10,242	[3]	8,900	[3]	'
Net charge offs	-6,586	[3]	-20,070	[3]	-29,179	[3]	-87,389	[3]	'
Allowance for loan losses, end of period	154,071	[3]	158,585	[3]	154,071	[3]	158,585	[3]	'
Ending Balance of Allowance Attributable to Loans [Abstract]	'		'		'		'		'
Individually evaluated for impairment	39,683	[3]	'		39,683	[3]	'		41,989	[3]
Collectively evaluated for impairment	114,388	[3]	'		114,388	[3]	'		113,586	[3]
Ending Balance of Loans [Abstract]	'		'		'		'		'
Individually evaluated for impairment	192,909	[3]	'		192,909	[3]	'		196,723	[3]
Collectively evaluated for impairment	16,302,515	[3]	'		16,302,515	[3]	'		15,390,591	[3]
Purchased Impaired Loans	369,259	[4]	'		369,259	[4]	'		384,588	[4]
Purchased nonimpaired loans	138,550	[4]	'		138,550	[4]	'		155,452	[4]
Total loans, excluding covered loans	16,495,424	[3]	'		16,495,424	[3]	'		15,587,314	[3]
Covered loans	507,809	[4]	'		507,809	[4]	'		540,040	[4]
Consumer loans	'		'		'		'		'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'		'		'		'		'
Allowance for loan losses, beginning of period	88,784	[5]	83,702	[5]	90,903	[5]	75,403	[5]	'
Provision charged to income	16,216	[5]	17,307	[5]	46,014	[5]	50,936	[5]	'
Loans charged off	-20,514	[5]	-17,674	[5]	-62,887	[5]	-52,744	[5]	'
Loan recoveries	3,909	[5]	4,064	[5]	14,365	[5]	13,804	[5]	'
Net charge offs	-16,605	[5]	-13,610	[5]	-48,522	[5]	-38,940	[5]	'
Allowance for loan losses, end of period	88,395	[5]	87,399	[5]	88,395	[5]	87,399	[5]	'
Ending Balance of Allowance Attributable to Loans [Abstract]	'		'		'		'		'
Individually evaluated for impairment	1,031	[5]	'		1,031	[5]	'		1,526	[5]
Collectively evaluated for impairment	87,364	[5]	'		87,364	[5]	'		89,377	[5]
Ending Balance of Loans [Abstract]	'		'		'		'		'
Individually evaluated for impairment	1,431	[5]	'		1,431	[5]	'		1,625	[5]
Collectively evaluated for impairment	3,944,321	[5]	'		3,944,321	[5]	'		3,292,001	[5]
Purchased Impaired Loans	0		'		0		'		12
Purchased nonimpaired loans	6,277		'		6,277		'		7,153
Total loans, excluding covered loans	3,945,752	[5]	'		3,945,752	[5]	'		3,293,626	[5]
Covered loans	$6,277		'		$6,277		'		$7,165
[1]	Includes commercial real estate – mortgage and real estate – construction loans.
[2]	Includes real estate – construction and commercial real estate - mortgage.
[3]	Includes residential real estate – mortgage, equity lines of credit and equity loans.
[4]	Includes residential real estate – mortgage, equity lines of credit and equity loans
[5]	Includes credit card, consumer – direct and consumer – indirect loans.

Loans_and_Allowances_for_Loan_1

Loans and Allowances for Loan Losses - Impaired loans by loan class (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Individually analyzed impaired loans with no recorded allowance, recorded investment	$40,782	'	$40,782	'	$74,507
Individually analyzed impaired loans with no recorded allowance, unpaid principle balance	48,705	'	48,705	'	85,921
Individually analyzed impaired loans with a recorded allowance, recorded investment	337,809	'	337,809	'	429,486
Individually analyzed impaired loans with a recorded allowance, unpaid principle balance	356,278	'	356,278	'	458,254
Individually analyzed impaired loans with a recorded allowance, allowance	67,737	'	67,737	'	81,751
Total individually analyzed impaired loans, average recorded investment	380,431	567,308	420,506	614,748	'
Total individually analyzed impaired loans, interest income recognized	2,420	3,024	7,911	9,295	'
Commercial, financial and agricultural	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Individually analyzed impaired loans with no recorded allowance, recorded investment	6,098	'	6,098	'	19,984
Individually analyzed impaired loans with no recorded allowance, unpaid principle balance	12,694	'	12,694	'	27,639
Individually analyzed impaired loans with a recorded allowance, recorded investment	63,988	'	63,988	'	118,063
Individually analyzed impaired loans with a recorded allowance, unpaid principle balance	75,458	'	75,458	'	138,092
Individually analyzed impaired loans with a recorded allowance, allowance	20,620	'	20,620	'	28,828
Total individually analyzed impaired loans, average recorded investment	70,256	151,326	95,116	128,472	'
Total individually analyzed impaired loans, interest income recognized	182	286	970	1,007	'
Real estate - construction	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Individually analyzed impaired loans with no recorded allowance, recorded investment	4,509	'	4,509	'	1,314
Individually analyzed impaired loans with no recorded allowance, unpaid principle balance	5,040	'	5,040	'	1,555
Individually analyzed impaired loans with a recorded allowance, recorded investment	2,851	'	2,851	'	9,248
Individually analyzed impaired loans with a recorded allowance, unpaid principle balance	3,420	'	3,420	'	10,812
Individually analyzed impaired loans with a recorded allowance, allowance	507	'	507	'	836
Total individually analyzed impaired loans, average recorded investment	9,054	16,666	9,421	64,136	'
Total individually analyzed impaired loans, interest income recognized	58	94	177	637	'
Commercial real estate - mortgage	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Individually analyzed impaired loans with no recorded allowance, recorded investment	20,144	'	20,144	'	51,303
Individually analyzed impaired loans with no recorded allowance, unpaid principle balance	20,940	'	20,940	'	54,821
Individually analyzed impaired loans with a recorded allowance, recorded investment	86,661	'	86,661	'	105,733
Individually analyzed impaired loans with a recorded allowance, unpaid principle balance	92,631	'	92,631	'	112,177
Individually analyzed impaired loans with a recorded allowance, allowance	5,896	'	5,896	'	8,572
Total individually analyzed impaired loans, average recorded investment	108,323	196,009	122,358	222,189	'
Total individually analyzed impaired loans, interest income recognized	754	1,219	2,531	3,478	'
Residential real estate - mortgage	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Individually analyzed impaired loans with no recorded allowance, recorded investment	10,031	'	10,031	'	1,906
Individually analyzed impaired loans with no recorded allowance, unpaid principle balance	10,031	'	10,031	'	1,906
Individually analyzed impaired loans with a recorded allowance, recorded investment	104,205	'	104,205	'	115,550
Individually analyzed impaired loans with a recorded allowance, unpaid principle balance	104,289	'	104,289	'	115,734
Individually analyzed impaired loans with a recorded allowance, allowance	6,988	'	6,988	'	7,378
Total individually analyzed impaired loans, average recorded investment	112,912	125,699	113,579	147,853	'
Total individually analyzed impaired loans, interest income recognized	724	773	2,168	2,710	'
Equity lines of credit	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Individually analyzed impaired loans with no recorded allowance, recorded investment	0	'	0	'	0
Individually analyzed impaired loans with no recorded allowance, unpaid principle balance	0	'	0	'	0
Individually analyzed impaired loans with a recorded allowance, recorded investment	24,189	'	24,189	'	23,593
Individually analyzed impaired loans with a recorded allowance, unpaid principle balance	24,235	'	24,235	'	24,021
Individually analyzed impaired loans with a recorded allowance, allowance	22,815	'	22,815	'	23,190
Total individually analyzed impaired loans, average recorded investment	24,010	23,835	23,641	10,527	'
Total individually analyzed impaired loans, interest income recognized	268	254	773	335	'
Equity loans	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Individually analyzed impaired loans with no recorded allowance, recorded investment	0	'	0	'	0
Individually analyzed impaired loans with no recorded allowance, unpaid principle balance	0	'	0	'	0
Individually analyzed impaired loans with a recorded allowance, recorded investment	54,484	'	54,484	'	55,674
Individually analyzed impaired loans with a recorded allowance, unpaid principle balance	54,814	'	54,814	'	55,794
Individually analyzed impaired loans with a recorded allowance, allowance	9,880	'	9,880	'	11,421
Total individually analyzed impaired loans, average recorded investment	54,506	51,822	54,977	40,600	'
Total individually analyzed impaired loans, interest income recognized	432	395	1,286	1,086	'
Credit card	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Individually analyzed impaired loans with no recorded allowance, recorded investment	0	'	0	'	0
Individually analyzed impaired loans with no recorded allowance, unpaid principle balance	0	'	0	'	0
Individually analyzed impaired loans with a recorded allowance, recorded investment	0	'	0	'	0
Individually analyzed impaired loans with a recorded allowance, unpaid principle balance	0	'	0	'	0
Individually analyzed impaired loans with a recorded allowance, allowance	0	'	0	'	0
Total individually analyzed impaired loans, average recorded investment	0	0	0	0	'
Total individually analyzed impaired loans, interest income recognized	0	0	0	0	'
Consumer - direct	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Individually analyzed impaired loans with no recorded allowance, recorded investment	0	'	0	'	0
Individually analyzed impaired loans with no recorded allowance, unpaid principle balance	0	'	0	'	0
Individually analyzed impaired loans with a recorded allowance, recorded investment	88	'	88	'	182
Individually analyzed impaired loans with a recorded allowance, unpaid principle balance	88	'	88	'	181
Individually analyzed impaired loans with a recorded allowance, allowance	33	'	33	'	83
Total individually analyzed impaired loans, average recorded investment	94	216	131	170	'
Total individually analyzed impaired loans, interest income recognized	1	2	3	30	'
Consumer - indirect	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Individually analyzed impaired loans with no recorded allowance, recorded investment	0	'	0	'	0
Individually analyzed impaired loans with no recorded allowance, unpaid principle balance	0	'	0	'	0
Individually analyzed impaired loans with a recorded allowance, recorded investment	1,343	'	1,343	'	1,443
Individually analyzed impaired loans with a recorded allowance, unpaid principle balance	1,343	'	1,343	'	1,443
Individually analyzed impaired loans with a recorded allowance, allowance	998	'	998	'	1,443
Total individually analyzed impaired loans, average recorded investment	1,276	1,735	1,283	801	'
Total individually analyzed impaired loans, interest income recognized	$1	$1	$3	$12	'

Loans_and_Allowance_for_Loan_L8

Loans and Allowance for Loan Losses - Credit quality indicators (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Purchased Impaired Loans	$369,259	$389,360
Commercial, financial and agricultural	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Purchased Impaired Loans	0	0
Total loans, excluding covered loans	22,510,956	20,209,209
Real estate - construction	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	1,977,784	1,736,348
Commercial real estate - mortgage	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	9,498,561	9,106,329
Residential real estate - mortgage	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	13,606,816	12,706,879
Equity lines of credit	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	2,259,561	2,236,367
Equity loans	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	629,047	644,068
Credit card	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	631,000	660,073
Consumer - direct	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	609,980	516,572
Consumer - indirect	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	2,704,772	2,116,981
Pass | Commercial, financial and agricultural	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	22,036,391	19,582,014
Pass | Real estate - construction	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	1,959,687	1,707,719
Pass | Commercial real estate - mortgage	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	9,134,217	8,562,261
Special Mention | Commercial, financial and agricultural	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	254,768	353,638
Special Mention | Real estate - construction	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	8,832	9,918
Special Mention | Commercial real estate - mortgage	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	183,690	271,500
Substandard | Commercial, financial and agricultural	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	188,293	261,995
Substandard | Real estate - construction	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	7,891	17,112
Substandard | Commercial real estate - mortgage	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	153,722	243,042
Doubtful | Commercial, financial and agricultural	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	31,504	11,562
Doubtful | Real estate - construction	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	1,374	1,599
Doubtful | Commercial real estate - mortgage	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	26,932	29,526
Performing | Residential real estate - mortgage	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	13,499,841	12,601,515
Performing | Equity lines of credit	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	2,222,138	2,199,827
Performing | Equity loans	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	608,848	621,897
Performing | Credit card	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	622,226	649,796
Performing | Consumer - direct	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	607,594	513,630
Performing | Consumer - indirect	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	2,701,787	2,113,918
Nonperforming | Residential real estate - mortgage	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	106,975	105,364
Nonperforming | Equity lines of credit	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	37,423	36,540
Nonperforming | Equity loans	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	20,199	22,171
Nonperforming | Credit card	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	8,774	10,277
Nonperforming | Consumer - direct	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	2,386	2,942
Nonperforming | Consumer - indirect	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	$2,985	$3,063

Loans_and_Allowance_for_Loan_L9

Loans and Allowance for Loan Losses - Past due loans (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due, Covered	$1,057	$1,247
60 - 89 Days Past Due, Covered	689	290
90 Days or More Past Due, Covered	4,088	4,122
Nonaccrual, Covered	3,772	5,425
Accruing TDRs, Covered	2,399	3,455
Total Past Due and Impaired, Covered	12,005	14,539
Not Past Due or Impaired, Covered	199,492	330,291
Total, Covered	211,497	344,830
30 - 59 Days Past Due, Total Loans	117,191	132,604
60 - 89 Days Past Due, Total Loans	46,122	58,135
90 Days or More Past Due, Total Loans	27,835	30,326
Nonaccrual, Total Loans	344,937	434,356
Accruing TDRs, Total Loans	171,780	209,708
Total Past Due and Impaired, Total Loans	707,865	865,129
Not Past Due or Impaired, Total Loans	53,932,109	49,412,527
Total Loans	54,639,974	50,277,656
Commercial, financial and agricultural	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	12,846	9,485
60 - 89 Days Past Due	3,261	6,111
90 Days or More Past Due	838	2,212
Nonaccrual	79,577	128,231
Accruing TDRs	10,444	25,548
Total Past Due and Impaired	106,966	171,587
Not Past Due or Impaired	22,403,990	20,037,622
Total	22,510,956	20,209,209
Real estate - construction	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	526	4,258
60 - 89 Days Past Due	109	1,862
90 Days or More Past Due	464	240
Nonaccrual	9,928	14,183
Accruing TDRs	672	3,801
Total Past Due and Impaired	11,699	24,344
Not Past Due or Impaired	1,966,085	1,712,004
Total	1,977,784	1,736,348
Commercial real estate - mortgage	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	7,716	9,521
60 - 89 Days Past Due	3,129	4,869
90 Days or More Past Due	3,448	797
Nonaccrual	92,718	129,672
Accruing TDRs	43,023	59,727
Total Past Due and Impaired	150,034	204,586
Not Past Due or Impaired	9,348,527	8,901,743
Total	9,498,561	9,106,329
Residential real estate - mortgage	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	37,711	48,597
60 - 89 Days Past Due	20,447	22,629
90 Days or More Past Due	2,474	2,460
Nonaccrual	104,192	102,904
Accruing TDRs	72,590	74,236
Total Past Due and Impaired	237,414	250,826
Not Past Due or Impaired	13,369,402	12,456,053
Total	13,606,816	12,706,879
Equity lines of credit	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	8,046	12,230
60 - 89 Days Past Due	3,966	6,252
90 Days or More Past Due	3,308	5,109
Nonaccrual	34,115	31,431
Accruing TDRs	0	0
Total Past Due and Impaired	49,435	55,022
Not Past Due or Impaired	2,210,126	2,181,345
Total	2,259,561	2,236,367
Equity loans	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	5,624	7,630
60 - 89 Days Past Due	2,746	3,170
90 Days or More Past Due	1,068	1,167
Nonaccrual	18,637	20,447
Accruing TDRs	42,595	42,850
Total Past Due and Impaired	70,670	75,264
Not Past Due or Impaired	558,377	568,804
Total	629,047	644,068
Credit card	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	5,566	5,955
60 - 89 Days Past Due	3,718	4,676
90 Days or More Past Due	8,774	10,277
Nonaccrual	0	0
Accruing TDRs	0	0
Total Past Due and Impaired	18,058	20,908
Not Past Due or Impaired	612,942	639,165
Total	631,000	660,073
Consumer - direct	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	7,751	8,736
60 - 89 Days Past Due	1,678	3,000
90 Days or More Past Due	1,984	2,402
Nonaccrual	402	540
Accruing TDRs	57	91
Total Past Due and Impaired	11,872	14,769
Not Past Due or Impaired	598,108	501,803
Total	609,980	516,572
Consumer - indirect	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	30,348	24,945
60 - 89 Days Past Due	6,379	5,276
90 Days or More Past Due	1,389	1,540
Nonaccrual	1,596	1,523
Accruing TDRs	0	0
Total Past Due and Impaired	39,712	33,284
Not Past Due or Impaired	2,665,060	2,083,697
Total	$2,704,772	$2,116,981

Loans_and_Allowance_for_Loans_

Loans and Allowance for Loans Losses - Troubled debt restructurings (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Modifications [Line Items]	'	'
30 - 59 Days Past Due, Covered	$6	$21
60 - 89 Days Past Due, Covered	214	0
90 Days or More Past Due, Covered	0	0
Nonaccrual, Covered	1,369	5,428
Total Past Due and Nonaccrual, Covered	1,589	5,449
Not Past Due or Nonaccrual, Covered	2,179	3,434
Total, Covered	3,768	8,883
30 - 59 Days Past Due, Total Loans	7,198	7,957
60 - 89 Days Past Due, Total Loans	4,789	3,819
90 Days or More Past Due, Total Loans	991	1,317
Nonaccrual, Total Loans	96,944	109,457
Total Past Due and Nonaccrual, Total Loans	109,922	122,550
Not Past Due or Nonaccrual, Total Loans	158,802	196,615
Total Loans	268,724	319,165
Commercial, financial and agricultural	'	'
Financing Receivable, Modifications [Line Items]	'	'
30-59 Days Past Due	0	5
60-89 Days Past Due	0	0
90 Days or More Past Due	188	0
Nonaccrual	18,517	20,498
Total Past Due and Nonaccrual	18,705	20,503
Not Past Due or Nonaccrual	10,256	25,543
Total	28,961	46,046
Real estate - construction	'	'
Financing Receivable, Modifications [Line Items]	'	'
30-59 Days Past Due	0	32
60-89 Days Past Due	0	50
90 Days or More Past Due	0	0
Nonaccrual	175	181
Total Past Due and Nonaccrual	175	263
Not Past Due or Nonaccrual	672	3,719
Total	847	3,982
Commercial real estate - mortgage	'	'
Financing Receivable, Modifications [Line Items]	'	'
30-59 Days Past Due	0	2,345
60-89 Days Past Due	21	0
90 Days or More Past Due	0	0
Nonaccrual	10,208	13,910
Total Past Due and Nonaccrual	10,229	16,255
Not Past Due or Nonaccrual	43,002	57,382
Total	53,231	73,637
Residential real estate - mortgage	'	'
Financing Receivable, Modifications [Line Items]	'	'
30-59 Days Past Due	5,098	3,755
60-89 Days Past Due	2,485	2,747
90 Days or More Past Due	309	760
Nonaccrual	29,118	30,492
Total Past Due and Nonaccrual	37,010	37,754
Not Past Due or Nonaccrual	64,698	66,974
Total	101,708	104,728
Equity lines of credit	'	'
Financing Receivable, Modifications [Line Items]	'	'
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
90 Days or More Past Due	0	0
Nonaccrual	24,189	24,592
Total Past Due and Nonaccrual	24,189	24,592
Not Past Due or Nonaccrual	0	0
Total	24,189	24,592
Equity loans	'	'
Financing Receivable, Modifications [Line Items]	'	'
30-59 Days Past Due	2,094	1,799
60-89 Days Past Due	2,069	1,022
90 Days or More Past Due	494	557
Nonaccrual	11,994	12,823
Total Past Due and Nonaccrual	16,651	16,201
Not Past Due or Nonaccrual	37,938	39,472
Total	54,589	55,673
Credit card	'	'
Financing Receivable, Modifications [Line Items]	'	'
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
90 Days or More Past Due	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Not Past Due or Nonaccrual	0	0
Total	0	0
Consumer - direct	'	'
Financing Receivable, Modifications [Line Items]	'	'
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
90 Days or More Past Due	0	0
Nonaccrual	32	90
Total Past Due and Nonaccrual	32	90
Not Past Due or Nonaccrual	57	91
Total	89	181
Consumer - indirect	'	'
Financing Receivable, Modifications [Line Items]	'	'
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
90 Days or More Past Due	0	0
Nonaccrual	1,342	1,443
Total Past Due and Nonaccrual	1,342	1,443
Not Past Due or Nonaccrual	0	0
Total	$1,342	$1,443

Recovered_Sheet1

Loans and Allowance for Loan Losses - Classified as troubled debt restructurings (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
	Contract	Contract	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of contracts, covered	1	1	1	3
Post modification outstanding, recorded investment, covered	$3	$22	$3	$71
Number of subsequent default contracts, covered	0	1	0	1
Recorded investment at default, covered	0	35	0	35
Commercial, financial and agricultural	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of contracts	2	1	4	7
Post modification outstanding, recorded investment	14,118	1,351	14,281	6,410
Number of subsequent default contracts	0	0	0	1
Recorded investment at default	0	0	0	9,531
Real estate - construction	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of contracts	2	0	2	3
Post modification outstanding, recorded investment	405	0	405	2,409
Number of subsequent default contracts	0	0	0	0
Recorded investment at default	0	0	0	0
Commercial real estate - mortgage	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of contracts	0	1	9	14
Post modification outstanding, recorded investment	0	115	6,586	3,947
Number of subsequent default contracts	0	1	1	2
Recorded investment at default	0	422	2,198	529
Residential real estate - mortgage	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of contracts	18	21	74	190
Post modification outstanding, recorded investment	3,255	2,527	8,373	26,038
Number of subsequent default contracts	2	2	2	12
Recorded investment at default	144	201	144	2,336
Equity lines of credit	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of contracts	32	22	129	482
Post modification outstanding, recorded investment	1,946	898	6,426	24,134
Number of subsequent default contracts	0	5	3	5
Recorded investment at default	0	309	275	309
Equity loans	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of contracts	13	31	54	390
Post modification outstanding, recorded investment	920	3,388	4,237	16,648
Number of subsequent default contracts	3	5	7	6
Recorded investment at default	381	370	763	424
Credit card	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of contracts	0	0	0	0
Post modification outstanding, recorded investment	0	0	0	0
Number of subsequent default contracts	0	0	0	0
Recorded investment at default	0	0	0	0
Consumer - direct	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of contracts	0	2	0	17
Post modification outstanding, recorded investment	0	5	0	138
Number of subsequent default contracts	0	0	0	0
Recorded investment at default	0	0	0	0
Consumer - indirect	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of contracts	21	20	71	404
Post modification outstanding, recorded investment	343	184	1,015	2,188
Number of subsequent default contracts	0	0	0	0
Recorded investment at default	$0	$0	$0	$0

Recovered_Sheet2

Loans and Allowance for Loan Losses - Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Receivables, Change in Method of Calculating Impairment, Recorded Investment	'	'	'	'	'	$52,600,000
Certain Loans and Debt Securities Acquired in Transfer, Recorded Investment with Credit Losses Due to Subsequent Impairment	1,400,000	'	1,400,000	'	4,800,000	'
Certain Loans and Debt Securities Acquired in Transfer, Unpaid Principle Balance with Credit Losses Due to Subsequent Impairment	5,200,000	'	5,200,000	'	10,900,000	'
Purchased impaired loans, allowance	4,198,000	'	4,198,000	'	243,000	'
Recognized provision for loan losses attributable to credit deterioration (improvements) subsequent to acquisition of loan	-3,300,000	-800,000	-800,000	-5,400,000	'	'
Interest income on purchased nonimpaired loans	19,400,000	51,300,000	92,600,000	221,400,000	'	'
Certain loans and debt securities acquired in transfer, allowance recorded due to subsequent impairment	0	'	0	'	243,000	'
Covered loans	580,756,000	'	580,756,000	'	734,190,000	'
Loans held-for-sale, classified as TDR, nonaccrual	0	'	0	'	3,600,000	'
Commitment to lend additional funds to borrowers owing TDR loans	4,000,000	'	4,000,000	'	3,900,000	'
Allowance for Credit Losses, Change in Method of Calculating Impairment	'	'	'	'	'	33,500,000
Interest rate concession	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
TDRs	1,400,000	5,200,000	8,300,000	24,100,000	'	'
Modification of loan structure	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
TDRs	19,600,000	3,300,000	33,000,000	57,900,000	'	'
Covered loans	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Certain loans and debt securities acquired in transfer, allowance recorded due to subsequent impairment	$7,000,000	'	$7,000,000	'	$3,000,000	'

Loan_Sales_and_Servicing_Narra

Loan Sales and Servicing - Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Transfer of loans to loans held for sale	$0	$0	$14,000,000	$76,000,000	'
Recognized charge-off upon transfer of loan to loans held for sale	'	'	4,300,000	22,000,000	'
Balance of residential mortgage loans sold with retained servicing	3,200,000,000	'	3,200,000,000	'	2,700,000,000
Fair value of residential mortgage servicing rights	34,892,000	'	34,892,000	'	30,065,000
Originated For Sale In The Secondary Market	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Residential mortgage loans sold	367,000,000	422,000,000	736,000,000	1,300,000,000	'
Recognized net gains or losses on sale of residential mortgage loans	11,700,000	-4,100,000	22,900,000	15,700,000	'
Residential real estate - mortgage	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Servicing fees	4,100,000	3,000,000	11,400,000	7,100,000	'
Residential Real Estate Mortgage Loans Sold with Retained Serving Member	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Residential mortgage loans sold	367,000,000	422,000,000	736,000,000	1,300,000,000	'
Loans and Loans Held for Sale Excluding Loans Originated for Sale in Secondary Market | Loans and Loans Held for Sale Excluding Loans Originated for Sale in Secondary Market	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Cost of loans and leases sold	$1,000,000	$49,000,000	$102,000,000	$163,000,000	'

Loan_Sales_and_Servicing_Loans

Loan Sales and Servicing - Loans Held For Sale (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans held for sale	$190,882	$147,109
Real estate - construction	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans held for sale	0	4,447
Mortgage Receivable | Commercial real estate - mortgage	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans held for sale	0	2,912
Mortgage Receivable | Residential real estate	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans held for sale	$190,882	$139,750

Loan_Sales_and_Servicing_Resid

Loan Sales and Servicing - Residential MSRs (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
In Thousands, unless otherwise specified			Residential mortgage		Residential mortgage		Residential mortgage		Residential mortgage
Servicing Asset at Fair Value, Amount [Roll Forward]	'	'	'		'		'		'
Beginning balance	$34,892	$30,065	$31,104		$22,623		$30,065		$13,255
Additions	'	'	4,060		4,865		8,066		13,998
Due to changes in valuation inputs or assumptions	'	'	367		1,914		-1,427		2,960
Due to other changes in fair value	'	'	-639	[1]	-341	[1]	-1,812	[1]	-1,152	[1]
Ending balance	$34,892	$30,065	$34,892		$29,061		$34,892		$29,061
[1]	Represents the realization of expected net servicing cash flows, expected borrower repayments and the passage of time.

Loan_Sales_and_Servicing_Valua

Loan Sales and Servicing - Valuation Assumptions (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]	'	'
Fair value of residential mortgage servicing rights	$34,892	$30,065
Mortgage loans sold and serviced, percentage	100.00%	100.00%
Weighted average life (in years)	'6 years 4 months 24 days	'6 years 10 months 24 days
Prepayment speed:	10.00%	8.80%
Effect on fair value of a 10% increase	-1,085	-743
Effect on fair value of a 20% increase	-2,131	-1,492
Weighted average discount rate:	10.10%	10.00%
Effect on fair value of a 10% increase	-1,272	-1,167
Effect on fair value of a 20% increase	($2,453)	($2,247)
Fixed rate mortgage loan	'	'
Servicing Assets at Fair Value [Line Items]	'	'
Mortgage loans sold and serviced, percentage	96.10%	96.40%
Adjustable rate mortgage loan	'	'
Servicing Assets at Fair Value [Line Items]	'	'
Mortgage loans sold and serviced, percentage	3.90%	3.60%

Derivatives_and_Hedging_Deriva

Derivatives and Hedging - Derivatives by Balance Sheet Location (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	$203,951		$192,771
Derivative liabilities, estimated fair value	197,979		200,207
Derivatives designated as hedging instrument | Other assets	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	64,506	[1]	71,275	[1]
Derivatives designated as hedging instrument | Accrued expenses and other liabilities	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	14,351	[2]	11,862	[2]
Derivatives designated as hedging instrument | Fair value hedges | Interest rate swap long term debt	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	1,423,950		423,950
Derivatives designated as hedging instrument | Fair value hedges | Other assets	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	62,272	[1]	67,623	[1]
Derivatives designated as hedging instrument | Fair value hedges | Other assets | Interest rate swap long term debt	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	62,272	[1]	67,623	[1]
Derivatives designated as hedging instrument | Fair value hedges | Accrued expenses and other liabilities	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	164	[2]	'
Derivatives designated as hedging instrument | Fair value hedges | Accrued expenses and other liabilities | Interest rate swap long term debt	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	164	[2]	'
Derivatives designated as hedging instrument | Cash flow hedges | Interest rate swap commercial loan	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	600,000		200,000
Derivatives designated as hedging instrument | Cash flow hedges | Interest rate swap FHLB advances	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	320,000		320,000
Derivatives designated as hedging instrument | Cash flow hedges | Other assets	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	2,234	[1]	3,652	[1]
Derivatives designated as hedging instrument | Cash flow hedges | Other assets | Interest rate swap commercial loan	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	2,234	[1]	3,652	[1]
Derivatives designated as hedging instrument | Cash flow hedges | Accrued expenses and other liabilities	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	14,187	[2]	11,862	[2]
Derivatives designated as hedging instrument | Cash flow hedges | Accrued expenses and other liabilities | Interest rate swap commercial loan	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	2,116	[2]	'
Derivatives designated as hedging instrument | Cash flow hedges | Accrued expenses and other liabilities | Interest rate swap FHLB advances	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	12,071	[2]	11,862	[2]
Derivatives not designated as hedging instrument | Interest rate contract, risk management and other purposes, forward and option contracts related to held for sale mortgages	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	270,600		171,364
Derivatives not designated as hedging instrument | Purchased Equity Option Contracts, Risk Management And Other Purposes, Equity Linked CDs	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	778,355		588,377
Derivatives not designated as hedging instrument | Equity Swap Contracts, Risk Management And Other Purposes, Sale of Visa Class B Shares	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	46,705		49,748
Derivatives not designated as hedging instrument | Foreign Exchange Contracts, Risk Management And Other Purposes, Commercial Loans	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	669,410		424,797
Derivatives not designated as hedging instrument | Foreign Exchange Spot Contracts, Risk Management And Other Purposes, Commercial Loans	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	41,702		41,133
Derivatives not designated as hedging instrument | Futures Contracts, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	427,000	[3]	657,000	[3]
Derivatives not designated as hedging instrument | Interest Rate Lock Commitments, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	226,010		129,791
Derivatives not designated as hedging instrument | Written Equity Options Linked to Equity Linked CDs	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	754,859		576,196
Derivatives not designated as hedging instrument | Interest Rate Contracts, Trading Account Assets and Liabilities, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	15,946,776		13,474,347
Derivatives not designated as hedging instrument | Commodity Contracts, Trading Account Assets and Liabilities, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	453,899		906,650
Derivatives not designated as hedging instrument | Foreign Exchange Contracts, Trading Account Assets and Liabilities, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Notional Amount	356,217		145,175
Derivatives not designated as hedging instrument | Other assets | Interest rate contract, risk management and other purposes, forward and option contracts related to held for sale mortgages	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	97	[1]	1,727	[1]
Derivatives not designated as hedging instrument | Other assets | Purchased Equity Option Contracts, Risk Management And Other Purposes, Equity Linked CDs	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	72,561	[1]	47,875	[1]
Derivatives not designated as hedging instrument | Other assets | Foreign Exchange Contracts, Risk Management And Other Purposes, Commercial Loans	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	9,372	[1]	1,072	[1]
Derivatives not designated as hedging instrument | Other assets | Foreign Exchange Spot Contracts, Risk Management And Other Purposes, Commercial Loans	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	1	[1]	55	[1]
Derivatives not designated as hedging instrument | Other assets | Free-standing derivative instruments – risk management and other purposes	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	82,031	[1]	50,729	[1]
Derivatives not designated as hedging instrument | Other assets | Interest Rate Lock Commitments, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	2,981	[1]	947	[1]
Derivatives not designated as hedging instrument | Other assets | Interest Rate Contracts, Trading Account Assets and Liabilities, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	247,415	[1]	262,578	[1]
Derivatives not designated as hedging instrument | Other assets | Commodity Contracts, Trading Account Assets and Liabilities, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	10,990	[1]	23,132	[1]
Derivatives not designated as hedging instrument | Other assets | Foreign Exchange Contracts, Trading Account Assets and Liabilities, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	4,952	[1]	4,450	[1]
Derivatives not designated as hedging instrument | Other assets | Trading account assets and liabilities, Customer Accomodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	263,357	[1]	290,160	[1]
Derivatives not designated as hedging instrument | Other assets | Free-standing derivative instruments – customer accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Assets	266,338	[1]	291,107	[1]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Interest rate contract, risk management and other purposes, forward and option contracts related to held for sale mortgages	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	795	[2]	56	[2]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Equity Swap Contracts, Risk Management And Other Purposes, Sale of Visa Class B Shares	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	1,168	[2]	1,244	[2]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Foreign Exchange Contracts, Risk Management And Other Purposes, Commercial Loans	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	225	[2]	2,690	[2]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Foreign Exchange Spot Contracts, Risk Management And Other Purposes, Commercial Loans	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	133	[2]	56	[2]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Free-standing derivative instruments – risk management and other purposes	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	2,321	[2]	4,046	[2]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Interest Rate Lock Commitments, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	2	[2]	57	[2]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Written Equity Options Linked to Equity Linked CDs	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	70,894	[2]	46,573	[2]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Interest Rate Contracts, Trading Account Assets and Liabilities, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	188,608	[2]	200,899	[2]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Commodity Contracts, Trading Account Assets and Liabilities, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	9,692	[2]	18,373	[2]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Foreign Exchange Contracts, Trading Account Assets and Liabilities, Customer Accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	4,266	[2]	3,894	[2]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Trading account assets and liabilities, Customer Accomodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	202,566	[2]	223,166	[2]
Derivatives not designated as hedging instrument | Accrued expenses and other liabilities | Free-standing derivative instruments – customer accommodation	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative liabilities, estimated fair value	$273,462	[2]	$269,796	[2]
[1]	Derivative assets, except for trading account assets that are recorded as a component of trading account assets on the Company's Unaudited Condensed Consolidated Balance Sheets, are recorded in other assets on the Company’s Unaudited Condensed Consolidated Balance Sheets.
[2]	Derivative liabilities are recorded in accrued expenses and other liabilities on the Company’s Unaudited Condensed Consolidated Balance Sheets.
[3]	Changes in fair value are cash settled daily; therefore, there is no ending balance at any given reporting period.

Derivatives_and_Hedging_Fair_V

Derivatives and Hedging - Fair Value Hedges (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Rate Fair Value Hedges [Abstract]	'	'	'	'
Subordinated debentures partially extinguished, amount	'	$126,000,000	'	$126,000,000
Interest Rate Swap	'	'	'	'
Interest Rate Fair Value Hedges [Abstract]	'	'	'	'
Subordinated debentures partially extinguished, amount	'	126,000,000	'	126,000,000
Derivatives designated as hedging instrument | Fair value hedges | Interest Rate Swap	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative, Average Remaining Maturity	'	'	'4 years 3 months 29 days	'
Derivatives designated as hedging instrument | Fair value hedges | Interest Rate Swap | Interest on FHLB and other borrowings	'	'	'	'
Interest Rate Fair Value Hedges [Abstract]	'	'	'	'
Change in fair value of interest rate contract - interest rate swaps hedging long term debt	-5,391,000	-2,271,000	-5,515,000	-29,995,000
Change in fair value of interest rate contract - hedged long term debt	4,829,000	2,748,000	5,048,000	30,792,000
Interest and amortization related to interest rate swaps on hedged long term debt	$6,081,000	$5,209,000	$18,114,000	$17,550,000

Derivatives_and_Hedging_Cash_F

Derivatives and Hedging - Cash Flow Hedges (Details) (Derivatives designated as hedging instrument, Cash flow hedges, Interest Rate Swap, USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Cash Flow Hedges Derivative Instruments at Fair Value, Net	($12,000,000)	'	($12,000,000)	'
Derivative, Average Remaining Maturity	'	'	'3 years 0 months 29 days	'
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge	'	'	'6 years 9 months 29 days	'
Interest Rate Cash Flow Hedges [Abstract]	'	'	'	'
Net change in amount recognized in other comprehensive income	-706,000	226,000	-2,388,000	6,491,000
Interest Income	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	'	'	-2,200,000	'
Interest Rate Cash Flow Hedges [Abstract]	'	'	'	'
Amount reclassified from accumulated other comprehensive income into net interest income	-41,000	-1,524,000	-1,768,000	-3,800,000
Amount of ineffectiveness recognized in net interest income	$0	$0	$0	$0

Derivatives_and_Hedging_Free_S

Derivatives and Hedging - Free Standing Derivative Instruments (Details) (Derivatives not designated as hedging instrument, USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Futures Contracts, Customer Accommodation | Corporate and correspondent investments sales	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$87	($339)	($146)	$278
Interest rate contract, risk management and other purposes, forward and option contracts related to held for sale mortgages | Mortgage Banking Income	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	1,558	-17,705	-2,549	-4,961
Purchased Equity Option Contracts, Risk Management And Other Purposes, Equity Linked CDs | Other expense	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	17,979	6,527	24,686	11,769
Foreign Exchange Contracts, Risk Management And Other Purposes, Commercial Loans | Corporate and correspondent investments sales	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	44,452	-15,721	27,022	-4,700
Foreign Exchange Spot Contracts, Risk Management And Other Purposes, Commercial Loans | Corporate and correspondent investments sales	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	-4,459	1,683	-1,052	878
Interest Rate Contracts, Trading Account Assets and Liabilities, Customer Accommodation | Corporate and correspondent investments sales	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	4,800	5,944	13,958	22,252
Interest Rate Lock Commitments, Customer Accommodation | Mortgage Banking Income	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	-842	3,289	2,089	-1,194
Commodity Contracts, Trading Account Assets and Liabilities, Customer Accommodation | Corporate and correspondent investments sales	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	191	-6	94	20
Foreign Exchange Contracts, Trading Account Assets and Liabilities, Customer Accommodation | Corporate and correspondent investments sales	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	309	63	679	346
Written Equity Options Linked to Equity Linked CDs | Other expense	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	($17,777)	($6,482)	($24,321)	($11,637)

Derivatives_and_Hedging_Credit

Derivatives and Hedging - Credit and Market Risks (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Credit Derivatives [Line Items]	'		'	'		'	'
Derivative, Collateral, Right to Reclaim Cash	$29,058,000	[1]	'	$29,058,000	[1]	'	$25,910,000	[1]
Derivate assets, total derivatives subject to a master netting arrangement, gross amounts not offset in the condensed consolidated balance sheets, cash collateral received/pledged	54,358,000	[1]	'	54,358,000	[1]	'	37,189,000	[1]
Other assets	'		'	'		'	'
Credit Derivatives [Line Items]	'		'	'		'	'
Derivative, Collateral, Right to Reclaim Cash	32,000,000		'	32,000,000		'	26,000,000
Deposits	'		'	'		'	'
Credit Derivatives [Line Items]	'		'	'		'	'
Derivate assets, total derivatives subject to a master netting arrangement, gross amounts not offset in the condensed consolidated balance sheets, cash collateral received/pledged	60,000,000		'	60,000,000		'	38,000,000
Derivatives not designated as hedging instrument | Interest Rate Swap	'		'	'		'	'
Credit Derivatives [Line Items]	'		'	'		'	'
Credit Risk Derivatives, at Fair Value, Net	263,000,000		'	263,000,000		'	'
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net	-125,000		-1,600,000	-851,000		-3,300,000	'
Derivatives, Nonperforming Positions	72,000		'	72,000		'	54,000
Derivatives designated as hedging instrument | Interest Rate Swap | Over the Counter	'		'	'		'	'
Credit Derivatives [Line Items]	'		'	'		'	'
Credit Risk Derivatives, at Fair Value, Net	$74,000,000		'	$74,000,000		'	'
[1]	The actual amount of collateral received/pledged is limited to the asset/liability balance and does not include excess collateral received/pledged. When excess collateral exists the collateral shown in the table above has been allocated based on the percentage of the actual amount of collateral posted.

Derivatives_and_Hedging_Contin

Derivatives and Hedging - Contingent Features (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'	'
Derivative, Net Liability Position, Aggregate Fair Value	$55	$57
Collateral Already Posted, Aggregate Fair Value	52	54
Additional Collateral, Aggregate Fair Value	$4	$3

Assets_and_Liabilities_Subject2

Assets and Liabilities Subject to Enforceable Master Netting Arrangements (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Securities purchased under agreements to resell	'		'
Securities purchased under agreements to resell, subject to master netting arrangement, gross amounts recognized	$248,622		'
Securities purchased under agreement to resell	248,622		'
Securities purchased under agreements to resell, subject to a master netting arrangement, gross amounts not offset in the Condensed Consolidated Balance Sheets, financial instruments	248,508	[1]	'
Securities purchased under agreements to resell, net amount	114		'
Derivative financial assets:	'		'
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized	203,951		192,771
Derivative assets, total derivative subject to a master netting arrangement, gross amounts offset in the condensed consolidated balance sheet	0		0
Derivative assets, total derivatives subject to a master netting arrangement, net amount presented in the condensed consolidated balance sheets	203,951		192,771
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts not offset in the condensed consolidated balance sheet, financial instruments	17,855	[1]	7,723	[1]
Derivate assets, total derivatives subject to a master netting arrangement, gross amounts not offset in the condensed consolidated balance sheets, cash collateral received/pledged	54,358	[1]	37,189	[1]
Derivative assets, total derivatives subject to a master netting arrangement, net amount	131,738		147,859
Derivative assets, total derivatives not subject to a master netting arrangement	208,924		220,340
Total derivative financial assets, gross amounts recognized	412,875		413,111
Total derivative financial assets, net amount presented in the condensed consolidated balance sheet	412,875		413,111
Total derivative financial assets, net amount	340,662		368,199
Securities sold under agreements to repurchase	'		'
Securities sold under agreements to repurchase, subject to a master netting arrangement, gross amounts recognized	219,973		'
Securities sold under agreements to repurchase, subject to a master netting arrangement, gross amount presented in the Condensed Consolidated Balance Sheet	219,973		'
Securities sold under agreements to repurchase, subject to a master netting arrangement, gross amounts not offset in the Condensed Consolidated Balance Sheet, financial instruments	219,850	[1]	'
Securities sold under agreements to repurchase, subject to a master netting arrangement, net amount	123		'
Derivative financial liabilities:	'		'
Derivative liabilities, total derivative subject to a master netting arrangement, gross amounts recognized	197,979		200,207
Derivative liabilities, total derivative subject to a master netting arrangement, gross amount offset in the condensed consolidated balance sheets	0		0
Derivative liabilities, total derivative subject to a master netting arrangement, net amount presented in the condensed consolidated balance sheets	197,979		200,207
Derivative liabilities, total derivative subject to a master netting arrangement, gross amounts not offset in the condensed consolidated balance sheets, financial instruments	34,626	[1]	46,466	[1]
Derivative liabilities, total derivative subject to a master netting arrangement, gross amounts not offset in the condensed consolidated balance sheets, cash collateral received/pledged	29,058	[1]	25,910	[1]
Derivative liabilities, total derivatives subject to a master netting arrangement, net amount	134,295		127,831
Derivative liabilities, total derivatives not subject to a master netting arrangement	92,155		85,497
Derivative liabilities, total derivative financial liabilities, gross amount recognized	290,134		285,704
Total derivative financial liabilities, net amount presented in the condensed consolidated balance sheets	290,134		285,704
Total derivative financial liabilities, net amount	$226,450		$213,328
[1]	The actual amount of collateral received/pledged is limited to the asset/liability balance and does not include excess collateral received/pledged. When excess collateral exists the collateral shown in the table above has been allocated based on the percentage of the actual amount of collateral posted.

Commitments_Contingencies_and_1

Commitments, Contingencies and Guarantees - Commitments (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Guarantor Obligations [Line Items]	'	'
Commitments to extend credit	$27,313,485	$26,545,608
Financial Standby Letter of Credit	'	'
Guarantor Obligations [Line Items]	'	'
Standby and commercial letters of credit	$1,971,051	$2,093,159

Commitments_Contingencies_and_2

Commitments, Contingencies and Guarantees - Narrative (Details) (USD $)

1 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

Mar. 31, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Pending Litigation

Pending Litigation

Financial Standby Letter of Credit

Financial Standby Letter of Credit

Financial Standby Letter of Credit

Financial Standby Letter of Credit

Financial Standby Letter of Credit

Financial Standby Letter of Credit

Potential Recourse Related To FNMA Securitizations

Potential Recourse Related To FNMA Securitizations

Potential Recourse Related To FNMA Securitizations

Potential Recourse Related To FNMA Securitizations

Standard Representations And Warranties Related To Loan Sales To Government-Sponsored Agencies

Standard Representations And Warranties Related To Loan Sales To Government-Sponsored Agencies

FDIC Loss Sharing Agreement

FDIC Loss Sharing Agreement

FDIC Loss Sharing Agreement

FDIC Loss Sharing Agreement

Jack Demetree Vs. BBVA Compass

Other Litigation Matters

Minimum

Maximum

Accrued expenses and other liabilities

Accrued expenses and other liabilities

Accrued expenses and other liabilities

Accrued expenses and other liabilities

Accrued expenses and other liabilities

Accrued expenses and other liabilities

Commercial Loan

Single Family Residential Loan

Loss Contingencies And Guarantor Obligations [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Standby and commercial letters of credit expiration term

'

'

'

'

'1 year

'4 years

'

'

'

'

'

'

'

'

'

'

'

'

Letters of credit, deferred fees

'

'

$6,100,000

$4,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum potential amount of future undiscounted payments Company could be required to make on outstanding standby letters of credit

'

'

2,000,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss contingency accrual

'

10,000,000

'

'

'

'

91,000,000

76,000,000

'

'

626,000

738,000

1,000,000

1,000,000

'

'

'

'

Potential recourse

'

'

'

'

'

'

'

'

20,000,000

20,000,000

'

'

'

'

'

'

'

'

Covered loans

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,700,000,000

'

'

'

Loan losses reimbursable by FDIC, percentage of loss reimbursable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

80.00%

'

'

'

FDIC indemnification asset, threshold loss amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,300,000,000

'

'

'

FDIC indemnification asset, percentage of incurred losses above threshold, amount reimbursed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

95.00%

'

'

'

FDIC loss sharing agreement, term

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'

'5 years

'10 years

Loss sharing agreement, percentage owed by company to FDIC if terms are met

'

'

'

'

'

'

'

'

'

'

'

'

'

'

60.00%

'

'

'

Loss sharing agreement, threshold amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

457,000,000

'

'

'

Loss sharing agreement, percentage of net amount paid to company, subject to repayment to FDIC

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25.00%

'

'

'

Loss sharing agreement, administration costs for loans, percentage subject to repayment to FDIC

'

'

'

'

'

'

'

'

'

'

'

'

'

'

20.00%

'

'

'

Loss sharing agreement, average administration cost percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.00%

'

'

'

Loss sharing agreement, amount owed to FDIC

'

'

'

'

'

'

'

'

'

'

'

'

'

'

144,000,000

140,000,000

'

'

Loss Contingency, Damages Sought, Value

$16,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Narrative (Details) (USD $)

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Residential mortgage loans held for sale

Residential mortgage loans held for sale

Residential mortgage loans held for sale

Residential mortgage loans held for sale

Forward contracts

Forward contracts

Forward contracts

Forward contracts

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Noninterest income

Noninterest income

Noninterest income

Noninterest income

Fair Value, Option, Quantitative Disclosures [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Federal home loan bank and federal reserve stock required to be owned by company

$485,000,000

$512,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net gains realized due to changes in fair value of loans

'

'

'

'

'

'

'

'

'

'

-2,300,000

7,600,000

3,800,000

-8,100,000

1,800,000

-17,700,000

-2,400,000

-4,900,000

Investment Securities - Fair Value

1,330,538,000

1,405,258,000

3,832,000

2,793,000

3,832,000

2,793,000

1,330,538,000

1,405,258,000

3,832,000

2,793,000

'

'

'

'

'

'

'

'

Investment securities held to maturity recorded as other than temporary impairment losses

'

'

0

968,000

180,000

1,430,000

'

'

'

'

'

'

'

'

'

'

'

'

Loans held for sale, estimated fair value

190,882,000

139,750,000

'

7,465,000

'

7,465,000

0

7,359,000

'

7,465,000

'

'

'

'

'

'

'

'

Net write-downs of other real estate held for sale

'

'

$758,000

$2,184,000

$2,340,000

($3,396,000)

'

'

'

'

'

'

'

'

'

'

'

'

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments - Unpaid Principle Balances (Details) (Residential mortgage loans held for sale, USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Residential mortgage loans held for sale	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Loans Held for Sale - Fair Value	$190,882	$139,750
Aggregate unpaid principle balance	184,639	137,300
Difference	$6,243	$2,450

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments - Fair value of balance sheet items (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:	'		'
Trading account assets	$515,136		$319,930
Loans held for sale, estimated fair value	190,882		139,750
Investment securities available for sale	9,326,413		8,313,085
Derivative Asset	412,875		413,111
Other assets	1,323,212		893,274
Liabilities:	'		'
Derivative liabilities	290,134		285,704
Quoted Prices in Active Markets for Identical Assets, Level 1	'		'
Assets:	'		'
Trading account assets	244,718		'
Investment securities available for sale	462,860		40,340
Derivative Asset	0		'
Liabilities:	'		'
Trading account liabilities	245,742		'
Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Trading account assets	268,699		318,285
Loans held for sale, estimated fair value	190,882		139,750
Investment securities available for sale	8,378,597		7,760,612
Derivative Asset	146,537		122,004
Liabilities:	'		'
Trading account liabilities	203,659		228,757
Derivative liabilities	86,398		61,237
Fair Value, Inputs, Level 3	'		'
Assets:	'		'
Trading account assets	1,719		1,645
Loans held for sale, estimated fair value	0		7,359
Investment securities available for sale	484,956		512,133
Derivative Asset	2,981		947
Liabilities:	'		'
Derivative liabilities	2		57
Fair Value, measurements, recurring	'		'
Assets:	'		'
Trading account assets	515,136		319,930
Loans held for sale, estimated fair value	190,882		139,750
Investment securities available for sale	8,841,463		7,800,958
Derivative Asset	149,518		122,951
Liabilities:	'		'
Trading account liabilities	449,401		228,757
Derivative liabilities	86,400		61,294
Fair Value, measurements, recurring | Interest rate contracts	'		'
Assets:	'		'
Derivative Asset	67,584		73,949
Liabilities:	'		'
Derivative liabilities	15,148		11,975
Fair Value, measurements, recurring | Equity Contract	'		'
Assets:	'		'
Derivative Asset	72,561		47,875
Liabilities:	'		'
Derivative liabilities	70,894		46,573
Fair Value, measurements, recurring | Foreign exchange contracts	'		'
Assets:	'		'
Derivative Asset	9,373		1,127
Liabilities:	'		'
Derivative liabilities	358		2,746
Fair Value, measurements, recurring | Quoted Prices in Active Markets for Identical Assets, Level 1	'		'
Assets:	'		'
Trading account assets	244,718		'
Investment securities available for sale	462,860		40,340
Liabilities:	'		'
Trading account liabilities	245,742		'
Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Trading account assets	268,699		318,285
Loans held for sale, estimated fair value	190,882		139,750
Investment securities available for sale	8,378,597		7,760,612
Derivative Asset	146,537		122,004
Liabilities:	'		'
Trading account liabilities	203,659		228,757
Derivative liabilities	86,398		61,237
Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2 | Interest rate contracts	'		'
Assets:	'		'
Derivative Asset	64,603		73,002
Liabilities:	'		'
Derivative liabilities	15,146		11,918
Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2 | Equity Contract	'		'
Assets:	'		'
Derivative Asset	72,561		47,875
Liabilities:	'		'
Derivative liabilities	70,894		46,573
Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2 | Foreign exchange contracts	'		'
Assets:	'		'
Derivative Asset	9,373		1,127
Liabilities:	'		'
Derivative liabilities	358		2,746
Fair Value, measurements, recurring | Fair Value, Inputs, Level 3	'		'
Assets:	'		'
Trading account assets	1,719		1,645
Investment securities available for sale	6		6
Derivative Asset	2,981		947
Other assets	34,892		30,065
Liabilities:	'		'
Derivative liabilities	2		57
Fair Value, measurements, recurring | Fair Value, Inputs, Level 3 | Interest rate contracts	'		'
Assets:	'		'
Derivative Asset	2,981		947
Liabilities:	'		'
Derivative liabilities	2		57
US Treasury and government agency	'		'
Assets:	'		'
Investment securities available for sale	1,213,581		260,937
US Treasury and government agency | Fair Value, measurements, recurring	'		'
Assets:	'		'
Trading account assets	244,718		24,655
Investment securities available for sale	1,213,581		260,937
Liabilities:	'		'
Trading account liabilities	245,742		'
US Treasury and government agency | Fair Value, measurements, recurring | Quoted Prices in Active Markets for Identical Assets, Level 1	'		'
Assets:	'		'
Trading account assets	244,718		'
Investment securities available for sale	433,680		'
Liabilities:	'		'
Trading account liabilities	245,742		'
US Treasury and government agency | Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Trading account assets	'		24,655
Investment securities available for sale	779,901		260,937
Liabilities:	'		'
Trading account liabilities	0		'
Collateralized mortgage obligations	'		'
Assets:	'		'
Investment securities available for sale	2,415,510		1,756,398
Collateralized mortgage obligations | Fair Value, measurements, recurring	'		'
Assets:	'		'
Trading account assets	'		1,285
Investment securities available for sale	4,694,399		5,233,791
Liabilities:	'		'
Trading account liabilities	'		5,568
Collateralized mortgage obligations | Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Trading account assets	'		1,285
Investment securities available for sale	4,694,399		5,233,791
Liabilities:	'		'
Trading account liabilities	'		5,568
State and political subdivisions	'		'
Assets:	'		'
Investment securities available for sale	488,787		509,436
State and political subdivisions | Fair Value, measurements, recurring	'		'
Assets:	'		'
Trading account assets	'		2,160
Investment securities available for sale	488,787		509,436
State and political subdivisions | Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Trading account assets	'		2,160
Investment securities available for sale	488,787		509,436
Other equity securities | Fair Value, measurements, recurring	'		'
Assets:	'		'
Trading account assets	'		2
Other equity securities | Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Trading account assets	'		2
Interest rate contracts | Fair Value, measurements, recurring	'		'
Assets:	'		'
Trading account assets	247,415		262,578
Liabilities:	'		'
Trading account liabilities	188,608		200,899
Interest rate contracts | Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Trading account assets	247,415		262,578
Liabilities:	'		'
Trading account liabilities	188,608		200,899
Commodity contracts | Fair Value, measurements, recurring	'		'
Assets:	'		'
Trading account assets	10,990		23,132
Liabilities:	'		'
Trading account liabilities	9,692		18,373
Commodity contracts | Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Trading account assets	10,990		23,132
Liabilities:	'		'
Trading account liabilities	9,692		18,373
Other trading liabilities | Fair Value, measurements, recurring	'		'
Liabilities:	'		'
Trading account liabilities	120		23
Other trading liabilities | Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Liabilities:	'		'
Trading account liabilities	120		23
Collateralized mortgage obligations | Fair Value, measurements, recurring	'		'
Assets:	'		'
Investment securities available for sale	2,415,510		1,756,398
Collateralized mortgage obligations | Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Investment securities available for sale	2,415,510		1,756,398
Other trading assets | Fair Value, measurements, recurring	'		'
Assets:	'		'
Trading account assets	1,840		1,668
Other trading assets | Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Trading account assets	121		23
Other trading assets | Fair Value, measurements, recurring | Fair Value, Inputs, Level 3	'		'
Assets:	'		'
Trading account assets	1,719		1,645
Other debt obligations	'		'
Assets:	'		'
Investment securities available for sale	29,127		40,333
Other debt obligations | Fair Value, measurements, recurring	'		'
Assets:	'		'
Trading account assets	5,221		'
Investment securities available for sale	29,127		40,333
Liabilities:	'		'
Trading account liabilities	973		'
Other debt obligations | Fair Value, measurements, recurring | Quoted Prices in Active Markets for Identical Assets, Level 1	'		'
Assets:	'		'
Investment securities available for sale	29,127		40,283
Other debt obligations | Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Trading account assets	5,221		'
Investment securities available for sale	0		50
Liabilities:	'		'
Trading account liabilities	973		'
Foreign exchange contracts | Fair Value, measurements, recurring	'		'
Assets:	'		'
Trading account assets	4,952		4,450
Liabilities:	'		'
Trading account liabilities	4,266		3,894
Foreign exchange contracts | Fair Value, measurements, recurring | Significant Other Observable Inputs, Level 2	'		'
Assets:	'		'
Trading account assets	4,952		4,450
Liabilities:	'		'
Trading account liabilities	4,266		3,894
Equity securities	'		'
Assets:	'		'
Investment securities available for sale	485,009		512,190
Equity securities | Fair Value, measurements, recurring	'		'
Assets:	'		'
Investment securities available for sale	59	[1]	63	[2]
Equity securities | Fair Value, measurements, recurring | Quoted Prices in Active Markets for Identical Assets, Level 1	'		'
Assets:	'		'
Investment securities available for sale	53	[1]	57	[2]
Equity securities | Fair Value, measurements, recurring | Fair Value, Inputs, Level 3	'		'
Assets:	'		'
Investment securities available for sale	6	[1]	6	[2]
Reported value measurement	'		'
Assets:	'		'
Trading account assets	515,136		319,930
Investment securities available for sale	9,326,413		8,313,085
Derivative Asset	149,518		122,951
Other assets	'		30,065
Liabilities:	'		'
Derivative liabilities	86,400		61,294
Reported value measurement | Fair Value, measurements, recurring	'		'
Assets:	'		'
Other assets	$34,892		$30,065
[1]	Excludes $485 million of FHLB and Federal Reserve stock required to be owned by the Company at September 30, 2014. These securities are carried at par.
[2]	Excludes $512 million of FHLB and Federal Reserve stock required to be owned by the Company at December 31, 2013. These securities are carried at par.

Fair_Value_of_Financial_Instru5

Fair Value of Financial Instruments - Assets measured on a recurring basis (Details) (Fair Value, measurements, recurring, USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Other trading securities

Other trading securities

Other trading securities

Other trading securities

State and political subdivisions

State and political subdivisions

State and political subdivisions

Equity securities

Equity securities

Equity securities

Equity securities

Equity securities

Equity securities

Interest rate contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

Other assets

Other assets

Other assets

Other assets

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

$10

($172)

$74

($293)

'

'

'

'

'

'

'

'

'

($842)

$3,289

$2,089

($1,194)

($272)

$1,573

($3,239)

$1,808

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance, beginning of year

1,709

1,962

1,645

2,083

8

0

0

6

6

6

6

6

6

3,821

533

890

5,016

31,104

22,623

30,065

13,255

Included in earnings

10

[1]

-172

[1]

74

[1]

-293

[1]

'

'

'

'

'

'

'

'

'

-842

[1]

3,289

[1]

2,089

-1,194

[1]

-272

[1]

1,573

[1]

-3,239

[1]

1,808

[1]

Purchases, issuances, sales and settlements: [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuances

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,060

4,865

8,066

13,998

Balance, end of year

1,719

1,790

1,719

1,790

0

0

0

6

6

6

6

6

6

2,979

3,822

2,979

3,822

34,892

29,061

34,892

29,061

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements

'

'

'

'

($8)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Included in noninterest income in the Unaudited Condensed Consolidated Statements of Income.

Fair_Value_of_Financial_Instru6

Fair Value of Financial Instruments - Assets measured on nonrecurring basis (Details) (USD $)

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

In Thousands, unless otherwise specified

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Investment Securities - Fair Value

$1,330,538

$1,405,258

'

$1,330,538

$1,405,258

$3,832

$2,793

$3,832

$2,793

$3,832

$2,793

Investment securities held to maturity recorded as other than temporary impairment losses

'

'

'

'

'

0

-968

-180

-1,430

'

'

Loans Held for Sale - Fair Value

190,882

139,750

'

0

7,359

'

7,465

'

7,465

'

7,465

Loans Held For Sale, Fair Value Adjustment

'

'

'

'

'

'

0

'

182

'

'

Impaired Financing Receivable, Recorded Investment

'

'

'

'

'

137,398

[1]

160,659

[1]

137,398

[1]

160,659

[1]

137,398

[1]

160,659

[1]

Impaired Financing Receivable, Fair Value Adjustment

'

'

'

'

'

-2,362

[1]

-18,699

[1]

-21,238

[1]

-36,872

[1]

'

'

Other Real Estate, Fair Value Disclosure

17,058

'

41,493

'

'

'

'

'

'

17,058

41,493

Impairment of Real Estate

'

'

'

'

'

($758)

($2,184)

($2,340)

$3,396

'

'

[1]

Total gains (losses) represent charge-offs on impaired loans for which adjustments are based on the appraised value of the collateral.

Fair_Value_of_Financial_Instru7

Fair Value of Financial Instruments - Quantitative information about unobservable inputs for material assets and liabilities measured using fair value (Details) (USD $)

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

In Thousands, unless otherwise specified

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, recurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Fair Value, measurements, nonrecurring

Other trading securities

Other trading securities

Other trading securities

Other trading securities

Interest rate contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

Other assets

Other assets

Other assets

Other assets

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Discounted cash flow

Minimum

Maximum

Impaired loans

Impaired loans

Impaired loans

OREO

Discounted cash flow

Minimum

Maximum

Discounted cash flow

Minimum

Maximum

Discounted cash flow

Minimum

Maximum

Fair Value, Inputs, Level 3

Discounted cash flow

Discounted cash flow

Appraised value

Minimum

Maximum

Appraised value

Fair Value, Inputs, Level 3

Discounted cash flow

Discounted cash flow

Fair Value, Inputs, Level 3

Discounted cash flow

Discounted cash flow

Fair Value, Inputs, Level 3

Discounted cash flow

Discounted cash flow

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Appraised value

Appraised value

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other Trading Asset, At Fair Value

'

'

'

'

'

'

'

$1,719

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest Rate Derivative Asset, At Fair Value

'

'

'

'

'

'

'

'

'

'

'

2,979

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value measurements

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

34,892

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Investment securities held to maturity, estimated fair value

1,330,538

1,405,258

'

1,330,538

1,405,258

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,832

2,793

3,832

2,793

'

'

'

'

'

'

'

Loans Held for Sale - Fair Value

190,882

139,750

'

0

7,359

190,882

139,750

'

'

'

'

'

'

'

'

'

'

'

'

'

7,465

'

7,465

'

'

'

'

'

'

'

Impaired Financing Receivable, Recorded Investment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

137,398

[1]

160,659

[1]

137,398

[1]

160,659

[1]

'

'

'

'

'

'

'

Default rate

'

'

'

'

'

'

'

'

8.70%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8.60%

8.00%

9.20%

'

'

'

'

Prepayment rate

'

'

'

'

'

'

'

'

6.90%

5.20%

9.80%

'

'

'

'

'

10.00%

6.10%

53.40%

'

'

'

'

6.20%

5.80%

6.50%

'

'

'

'

Cost to service rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

66.00%

62.30%

749.00%

'

'

'

'

'

'

'

'

'

'

'

Closing (pull-through) rate

'

'

'

'

'

'

'

'

'

'

'

'

52.40%

8.40%

98.70%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cap grid rate

'

'

'

'

'

'

'

'

'

'

'

'

1.00%

0.40%

2.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.10%

10.00%

11.00%

'

'

'

'

'

'

'

'

'

'

'

Loss severity rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

72.20%

51.30%

93.00%

'

'

'

'

Fair Value Inputs, Comparability Adjustments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

32.20%

0.00%

100.00%

8.00%

Other Real Estate, Fair Value Disclosure

$17,058

'

$41,493

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$17,058

$41,493

'

'

'

'

'

'

'

[1]

Total gains (losses) represent charge-offs on impaired loans for which adjustments are based on the appraised value of the collateral.

Fair_Value_of_Financial_Instru8

Fair Value of Financial Instruments - Carrying value and estimated fair value (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Cash and cash equivalents	$4,915,534	$3,598,460	$2,843,672	$6,158,442
Trading account assets	515,136	319,930	'	'
Investment securities available for sale	9,326,413	8,313,085	'	'
Investment securities held to maturity	1,417,985	1,519,196	'	'
Investment securities held to maturity, estimated fair value	1,330,538	1,405,258	'	'
Loans held for sale	190,882	147,109	'	'
Loans Held for Sale - Fair Value	190,882	139,750	'	'
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized	412,875	413,111	'	'
Other assets	1,323,212	893,274	'	'
Deposits	60,270,958	54,437,490	'	'
Federal funds purchased and securities sold under agreements to repurchase	809,053	852,570	'	'
Other short-term borrowings	246,835	5,591	'	'
Derivative liabilities	290,134	285,704	'	'
Fair Value, Inputs, Level 1	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Cash and cash equivalents, estimated fair value	4,915,534	3,598,460	'	'
Trading account assets	244,718	'	'	'
Investment securities available for sale	462,860	40,340	'	'
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized	0	'	'	'
Trading account liabilities	245,742	'	'	'
Fair Value, Inputs, Level 2	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Trading account assets	268,699	318,285	'	'
Investment securities available for sale	8,378,597	7,760,612	'	'
Loans Held for Sale - Fair Value	190,882	139,750	'	'
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized	146,537	122,004	'	'
Deposits, estimated fair value	60,325,222	54,492,651	'	'
FHLB and other borrowings, estimated fair value	4,529,351	4,287,220	'	'
Federal funds purchased and securities sold under agreements to repurchase, estimated fair value	809,053	852,570	'	'
Other short-term borrowings, estimated fair value	246,835	5,591	'	'
Trading account liabilities	203,659	228,757	'	'
Derivative liabilities	86,398	61,237	'	'
Fair Value, Inputs, Level 3	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Trading account assets	1,719	1,645	'	'
Investment securities available for sale	484,956	512,133	'	'
Investment securities held to maturity, estimated fair value	1,330,538	1,405,258	'	'
Loans Held for Sale - Fair Value	0	7,359	'	'
Loans, net, estimated fair value	52,363,208	47,822,339	'	'
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized	2,981	947	'	'
Other assets, estimated fair value	34,892	30,065	'	'
Derivative liabilities	2	57	'	'
Reported value measurement	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Cash and cash equivalents	4,915,534	3,598,460	'	'
Trading account assets	515,136	319,930	'	'
Investment securities available for sale	9,326,413	8,313,085	'	'
Investment securities held to maturity	1,417,985	1,519,196	'	'
Loans held for sale	190,882	147,109	'	'
Loans and Leases Receivable, Net Amount	54,313,355	49,966,297	'	'
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized	149,518	122,951	'	'
Other assets	'	30,065	'	'
Deposits	60,270,958	54,437,490	'	'
FHLB and other borrowings	4,551,050	4,298,707	'	'
Federal funds purchased and securities sold under agreements to repurchase	809,053	852,570	'	'
Other short-term borrowings	246,835	5,591	'	'
Trading Liabilities	449,401	228,757	'	'
Derivative liabilities	86,400	61,294	'	'
Estimate of fair value measurement	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Cash and cash equivalents, estimated fair value	4,915,534	3,598,460	'	'
Trading account assets	515,136	319,930	'	'
Investment securities available for sale	9,326,413	8,313,085	'	'
Investment securities held to maturity, estimated fair value	1,330,538	1,405,258	'	'
Loans Held for Sale - Fair Value	190,882	147,109	'	'
Loans, net, estimated fair value	52,363,208	47,822,339	'	'
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized	149,518	122,951	'	'
Other assets, estimated fair value	34,892	30,065	'	'
Deposits, estimated fair value	60,325,222	54,492,651	'	'
FHLB and other borrowings, estimated fair value	4,529,351	4,287,220	'	'
Federal funds purchased and securities sold under agreements to repurchase, estimated fair value	809,053	852,570	'	'
Other short-term borrowings, estimated fair value	246,835	5,591	'	'
Trading account liabilities	449,401	228,757	'	'
Derivative liabilities	86,400	61,294	'	'
Fair Value, measurements, recurring	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Trading account assets	515,136	319,930	'	'
Investment securities available for sale	8,841,463	7,800,958	'	'
Loans Held for Sale - Fair Value	190,882	139,750	'	'
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized	149,518	122,951	'	'
Trading account liabilities	449,401	228,757	'	'
Derivative liabilities	86,400	61,294	'	'
Fair Value, measurements, recurring | Fair Value, Inputs, Level 1	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Trading account assets	244,718	'	'	'
Investment securities available for sale	462,860	40,340	'	'
Trading account liabilities	245,742	'	'	'
Fair Value, measurements, recurring | Fair Value, Inputs, Level 2	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Trading account assets	268,699	318,285	'	'
Investment securities available for sale	8,378,597	7,760,612	'	'
Loans Held for Sale - Fair Value	190,882	139,750	'	'
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized	146,537	122,004	'	'
Trading account liabilities	203,659	228,757	'	'
Derivative liabilities	86,398	61,237	'	'
Fair Value, measurements, recurring | Fair Value, Inputs, Level 3	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Trading account assets	1,719	1,645	'	'
Investment securities available for sale	6	6	'	'
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized	2,981	947	'	'
Other assets	34,892	30,065	'	'
Derivative liabilities	2	57	'	'
Fair Value, measurements, recurring | Reported value measurement	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Other assets	$34,892	$30,065	'	'

Comprehensive_Income_Details

Comprehensive Income (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]	'	'	'	'
Unrealized holding gains (losses) arising during period from securities available for sale, pretax	($17,597)	($12,546)	$63,819	($158,157)
Unrealized holding gains (losses) arising during period from securities available for sale, tax expense (benefit)	-6,325	-4,602	22,936	-57,896
Unrealized holding gains (losses) arising during period from securities available for sale, after tax	-11,272	-7,944	40,883	-100,261
Less: reclassification adjustment for net gains on sale of securities in net income, pretax	9,710	0	47,608	33,030
Less: reclassification adjustment for net gains on sale of securities in net income, tax expense (benefit)	3,490	0	17,110	12,089
Less: reclassification adjustment for net gains on sale of securities in net income, after tax	6,220	0	30,498	20,941
Net change in unrealized gains (losses) on securities available for sale, pretax	-27,307	-12,546	16,211	-191,187
Net change in unrealized gains (losses) on securities available for sale, tax expense (benefit)	-9,815	-4,602	5,826	-69,985
Net change in unrealized holding gains (losses) on securities available for sale	-17,492	-7,944	10,385	-121,202
Change in unamortized net holding losses on investment securities held to maturity, pretax	3,745	3,218	11,213	12,753
Change in unamortized net holding losses on investment securities held to maturity, tax expense (benefit)	1,347	1,178	4,030	4,668
Change in unamortized net holding losses on investment securities held to maturity, after tax	2,398	2,040	7,183	8,085
Less: non-credit related impairment on investment securities held to maturity, pretax	0	0	235	2,288
Less: non-credit related impairment on investment securities held to maturity, tax expense (benefit)	0	0	84	838
Less: non-credit related impairment on investment securities held to maturity, after tax	0	0	151	1,450
Change in unamortized non-credit related impairment on investment securities held to maturity, pretax	387	269	1,141	1,982
Change in unamortized non-credit related impairment on investment securities held to maturity, tax expense (benefit)	138	98	409	725
Change in unamortized non-credit related impairment on investment securities held to maturity, after tax	249	171	732	1,257
Net change in unamortized holding losses on securities held to maturity, pretax	4,132	3,487	12,119	12,447
Net change in unamortized holding losses on securities held to maturity, tax expense (benefit)	1,485	1,276	4,355	4,555
Net change in unamortized holding losses on securities held to maturity	2,647	2,211	7,764	7,892
Unrealized holding gains (losses) arising during period from cash flow hedge instruments, pretax	-1,103	356	-3,729	10,198
Unrealized holding gains (losses) arising during period from cash flow hedge instruments, tax expense (benefit)	-397	130	-1,341	3,707
Unrealized holding gains (losses) arising during period from cash flow hedge instruments, after tax	-706	226	-2,388	6,491
Change in defined benefit plans, pretax	0	1	-2,672	1,018
Change in defined benefit plans, tax expense (benefit)	0	0	-1,001	337
Change in defined benefit plans, after tax	0	1	-1,671	681
Other comprehensive income (loss), pretax	-24,278	-8,702	21,929	-167,524
Other comprehensive income (loss), tax expense (benefit)	-8,727	-3,196	7,839	-61,386
Other comprehensive income (loss), net of tax	($15,551)	($5,506)	$14,090	($106,138)

Comprehensive_Income_AOCI_Deta

Comprehensive Income - AOCI (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	'	'	($87,936)	$26,058
Other comprehensive income (loss) before reclassifications	'	'	37,211	-97,639
Amounts reclassified from accumulated other comprehensive income (loss)	'	'	-23,121	-8,499
Other comprehensive income (loss), net of tax	-15,551	-5,506	14,090	-106,138
Ending balance	-73,846	-80,080	-73,846	-80,080
Unrealized Gains (Losses) on Securities Available for Sale and Transferred to Held to Maturity	'	'	'	'
Accumulated Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	'	'	-31,490	86,379
Other comprehensive income (loss) before reclassifications	'	'	40,883	-100,261
Amounts reclassified from accumulated other comprehensive income (loss)	'	'	-23,315	-12,856
Other comprehensive income (loss), net of tax	'	'	17,568	-113,117
Ending balance	-13,922	-26,738	-13,922	-26,738
Accumulated (Gains) Losses on Cash Flow Hedging Instruments	'	'	'	'
Accumulated Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	'	'	-5,289	-13,387
Other comprehensive income (loss) before reclassifications	'	'	-3,521	4,072
Amounts reclassified from accumulated other comprehensive income (loss)	'	'	1,133	2,419
Other comprehensive income (loss), net of tax	'	'	-2,388	6,491
Ending balance	-7,677	-6,896	-7,677	-6,896
Defined Benefit Plan Adjustment	'	'	'	'
Accumulated Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	'	'	-41,921	-38,243
Other comprehensive income (loss) before reclassifications	'	'	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	'	'	-1,671	681
Other comprehensive income (loss), net of tax	'	'	-1,671	681
Ending balance	-43,592	-37,562	-43,592	-37,562
Unamortized Impairment Losses on Investment Securities Held to Maturity	'	'	'	'
Accumulated Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	'	'	-9,236	-8,691
Other comprehensive income (loss) before reclassifications	'	'	-151	-1,450
Amounts reclassified from accumulated other comprehensive income (loss)	'	'	732	1,257
Other comprehensive income (loss), net of tax	'	'	581	-193
Ending balance	($8,655)	($8,884)	($8,655)	($8,884)

Comprehensive_Income_Reclassif

Comprehensive Income - Reclassifications out of AOCI (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'		'		'
Interest on investment securities held to maturity	$6,862		$7,701		$21,111		$23,132
Interest and fees on loans	509,766		519,016		1,538,788		1,586,886
Interest and fees on FHLB advances	-16,399		-17,129		-48,947		-49,070
Net income (loss) before income tax expense (benefit)	171,388		153,223		473,587		496,657
Income tax (expense) benefit	-27,770		-41,930		-107,467		-146,033
Net income	143,618		111,293		366,120		350,624
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Securities Available for Sale and Transferred to Held to Maturity	'		'		'		'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'		'		'
Investment securities gains, net	9,710	[1]	0	[1]	47,608	[1]	33,030	[1]
Interest on investment securities held to maturity	-3,745	[1]	-3,218	[1]	-11,213	[1]	-12,753	[1]
Net income (loss) before income tax expense (benefit)	5,965	[1]	-3,218	[1]	36,395	[1]	20,277	[1]
Income tax (expense) benefit	-2,143	[1]	1,178	[1]	-13,080	[1]	-7,421	[1]
Net income	3,822	[1]	-2,040	[1]	23,315	[1]	12,856	[1]
Reclassification out of Accumulated Other Comprehensive Income | Accumulated (Gains) Losses on Cash Flow Hedging Instruments	'		'		'		'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'		'		'
Interest and fees on loans	1,727	[1]	216	[1]	3,551	[1]	1,396	[1]
Interest and fees on FHLB advances	-1,768	[1]	-1,740	[1]	-5,319	[1]	-5,196	[1]
Net income (loss) before income tax expense (benefit)	-41	[1]	-1,524	[1]	-1,768	[1]	-3,800	[1]
Income tax (expense) benefit	15	[1]	554	[1]	635	[1]	1,381	[1]
Net income	-26	[1]	-970	[1]	-1,133	[1]	-2,419	[1]
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Plan Adjustment	'		'		'		'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'		'		'
Net periodic expense	0	[1],[2]	0	[1],[2]	2,672	[1],[2]	-1,018	[1],[2]
Income tax (expense) benefit	0	[1]	0	[1]	-1,001	[1]	337	[1]
Net income	0	[1]	0	[1]	1,671	[1]	-681	[1]
Reclassification out of Accumulated Other Comprehensive Income | Unamortized Impairment Losses on Investment Securities Held to Maturity	'		'		'		'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'		'		'
Interest on investment securities held to maturity	-387	[1]	-269	[1]	-1,141	[1]	-1,982	[1]
Income tax (expense) benefit	138	[1]	98	[1]	409	[1]	725	[1]
Net income	($249)	[1]	($171)	[1]	($732)	[1]	($1,257)	[1]
[1]	Amounts in parentheses indicate debits to the consolidated statement of income.
[2]	These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 18, Benefit Plans, in the Notes to the December 31, 2013, Consolidated Financial Statements for additional details).

Supplemental_Disclosure_for_St2

Supplemental Disclosure for Statement of Cash Flows (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Supplemental disclosures of cash flow information:	'	'
Interest paid	$202,851	$197,911
Net income taxes paid	95,167	87,838
Supplemental schedule of noncash investing and financing activities:	'	'
Transfer of loans and loans held for sale to OREO	14,278	39,165
Transfer of loans to loans held for sale	14,129	55,000
Change in unrealized gain (loss) on available for sale securities	16,211	-191,187
Issuance of restricted stock, net of cancellations	-1,060	-596
Business combinations:	'	'
Assets acquired	117,068	0
Liabilities assumed	$18,329	$0

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Net interest income	$481,968	$501,911	$1,476,041	$1,535,172
Allocated provision for loan losses	3,869	37,534	86,387	81,386
Noninterest income	226,431	210,985	681,204	665,375
Noninterest expense	533,142	522,139	1,597,271	1,622,504
Net income (loss) before income tax expense (benefit)	171,388	153,223	473,587	496,657
Income tax expense (benefit)	27,770	41,930	107,467	146,033
Net income	143,618	111,293	366,120	350,624
Less: net income attributable to noncontrolling interests	815	647	1,772	1,608
Net income attributable to shareholder	142,803	110,646	364,348	349,016
Average assets	77,909,087	69,325,343	75,774,391	69,706,435
Wealth and Retail Banking	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Number of Banking Centers the Entity Operates	673	'	673	'
Corporate, Non-Segment | Corporate Support and Other	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Net interest income	44,819	95,422	183,735	357,459
Allocated provision for loan losses	-9,580	-37	-11,159	3,964
Noninterest income	-62,068	-60,680	-189,597	-162,653
Noninterest expense	48,115	57,047	167,119	237,287
Net income (loss) before income tax expense (benefit)	-55,784	-22,268	-161,822	-46,445
Income tax expense (benefit)	-56,851	-23,439	-129,224	-56,271
Net income	1,067	1,171	-32,598	9,826
Less: net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to shareholder	1,067	1,171	-32,598	9,826
Average assets	6,905,632	7,110,270	6,893,604	7,125,867
Operating Segments | Wealth and Retail Banking	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Net interest income	209,186	204,443	623,347	610,148
Allocated provision for loan losses	15,036	35,856	68,103	87,176
Noninterest income	172,579	160,531	496,759	480,353
Noninterest expense	324,001	319,140	957,165	955,056
Net income (loss) before income tax expense (benefit)	42,728	9,978	94,838	48,269
Income tax expense (benefit)	15,916	3,716	35,327	17,980
Net income	26,812	6,262	59,511	30,289
Less: net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to shareholder	26,812	6,262	59,511	30,289
Average assets	22,655,312	21,061,941	22,173,516	20,774,537
Operating Segments | Commercial Banking	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Net interest income	212,448	193,141	622,085	561,075
Allocated provision for loan losses	-5,136	1,160	27,939	-12,571
Noninterest income	58,410	59,988	184,708	171,273
Noninterest expense	117,615	111,898	355,760	329,320
Net income (loss) before income tax expense (benefit)	158,379	140,071	423,094	415,599
Income tax expense (benefit)	58,996	52,176	157,603	154,810
Net income	99,383	87,895	265,491	260,789
Less: net income attributable to noncontrolling interests	382	208	464	283
Net income attributable to shareholder	99,001	87,687	265,027	260,506
Average assets	30,431,008	26,552,591	29,589,172	25,330,361
Operating Segments | Corporate and Investment Banking	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Net interest income	14,804	12,356	42,802	38,657
Allocated provision for loan losses	3,549	593	1,504	2,817
Noninterest income	41,465	43,548	125,519	101,882
Noninterest expense	38,318	29,626	105,097	89,442
Net income (loss) before income tax expense (benefit)	14,402	25,685	61,720	48,280
Income tax expense (benefit)	5,364	9,568	22,991	17,984
Net income	9,038	16,117	38,729	30,296
Less: net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to shareholder	9,038	16,117	38,729	30,296
Average assets	4,678,475	3,236,952	4,344,414	3,090,200
Operating Segments | Treasury	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Net interest income	711	-3,451	4,072	-32,167
Allocated provision for loan losses	0	-38	0	0
Noninterest income	16,045	7,598	63,815	74,520
Noninterest expense	5,093	4,428	12,130	11,399
Net income (loss) before income tax expense (benefit)	11,663	-243	55,757	30,954
Income tax expense (benefit)	4,345	-91	20,770	11,530
Net income	7,318	-152	34,987	19,424
Less: net income attributable to noncontrolling interests	433	439	1,308	1,325
Net income attributable to shareholder	6,885	-591	33,679	18,099
Average assets	$13,238,660	$11,363,589	$12,773,685	$13,385,470

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Related Party Transaction [Line Items]	'	'
Securities purchased under agreement to resell	$248,622	'
Securities sold under agreement to repurchase	219,973	'
BBVA	'	'
Related Party Transaction [Line Items]	'	'
Securities purchased under agreement to resell	248,622	0
Securities sold under agreement to repurchase	219,973	0
Derivatives designated as hedging instrument | BBVA	'	'
Related Party Transaction [Line Items]	'	'
Related party transaction, amount of transaction	2,234	3,652
Derivatives not designated as hedging instrument | Free-standing derivative instruments – risk management and other purposes | BBVA	'	'
Related Party Transaction [Line Items]	'	'
Related party transaction, amount of transaction	41,606	21,650
Derivatives not designated as hedging instrument | Free-standing derivative instruments – customer accommodation | BBVA	'	'
Related Party Transaction [Line Items]	'	'
Related party transaction, amount of transaction	($10,905)	($842)