Hancock Whitney (HWC) 10-Q8 Nov 132013 Q3 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 30, 2013	Nov. 01, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'HBHC	'
Entity Registrant Name	'HANCOCK HOLDING CO	'
Entity Central Index Key	'0000750577	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	82,108,866

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
ASSETS	'	'
Cash and due from banks	$425,693	$448,491
Interest-bearing bank deposits	446,617	1,498,985
Federal funds sold	15,696	1,203
Securities available for sale, at fair value (amortized cost of $1,435,823 and $1,986,882)	1,458,120	2,048,442
Securities held to maturity (fair value of $2,653,867 and $1,710,465)	2,666,082	1,668,018
Loans held for sale	18,444	50,605
Loans	11,751,958	11,595,512
Less: allowance for loan losses	-138,223	-136,171
unearned income	-17,486	-17,710
Loans, net	11,596,249	11,441,631
Property and equipment, net of accumulated depreciation of $169,178 and $160,592	450,233	477,864
Prepaid expenses	22,899	55,359
Other real estate, net	85,357	101,442
Accrued interest receivable	42,039	45,616
Goodwill	625,675	628,877
Other intangible assets, net	167,116	189,409
Life insurance contracts	376,908	367,317
FDIC loss share receivable	124,096	177,844
Deferred tax asset, net	153,893	128,385
Other assets	126,729	134,997
Total assets	18,801,846	19,464,485
Deposits:	'	'
Non-interest bearing demand	5,479,696	5,624,127
Interest-bearing savings, NOW, money market and time	9,575,175	10,120,061
Total deposits	15,054,871	15,744,188
Short-term borrowings	782,779	639,133
Long-term debt	376,664	396,589
Accrued interest payable	5,694	4,814
Other liabilities	225,396	226,483
Total liabilities	16,445,404	17,011,207
Stockholders' equity	'	'
Common stock-$3.33 par value per share; 350,000,000 shares authorized, 82,106,957 and 84,847,796 issued and outstanding, respectively	273,416	282,543
Capital surplus	1,554,135	1,647,638
Retained earnings	613,662	546,022
Accumulated other comprehensive loss, net	-84,771	-22,925
Total stockholders' equity	2,356,442	2,453,278
Total liabilities and stockholders' equity	$18,801,846	$19,464,485

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]	'	'
Securities available for sale, amortized cost	$1,435,823	$1,986,882
Held to maturity securities	2,653,867	1,710,465
Property and equipment, accumulated depreciation	$169,178	$160,592
Common stock, par value per share	$3.33	$3.33
Common stock, shares authorized	350,000,000	350,000,000
Common stock, shares issued	82,106,957	84,847,796
Common stock, shares outstanding	82,106,957	84,847,796

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest income:	'	'	'	'
Loans, including fees	$158,892	$166,334	$479,525	$497,840
Securities-taxable	21,318	21,141	62,242	67,889
Securities-tax exempt	1,176	1,422	3,615	4,377
Federal funds sold and other short term investments	253	308	1,178	1,304
Total interest income	181,639	189,205	546,560	571,410
Interest expense:	'	'	'	'
Deposits	5,851	7,519	18,785	25,654
Short-term borrowings	1,074	1,514	3,448	4,776
Long-term debt and other interest expense	3,184	2,916	9,603	9,977
Total interest expense	10,109	11,949	31,836	40,407
Net interest income	171,530	177,256	514,724	531,003
Provision for loan losses	7,569	8,101	25,404	26,141
Net interest income after provision for loan losses	163,961	169,155	489,320	504,862
Noninterest income:	'	'	'	'
Service charges on deposit accounts	20,519	20,834	59,398	58,015
Trust fees	9,477	7,743	27,972	24,464
Bank card and ATM fees	12,221	11,870	34,678	37,586
Investment and annuity fees	5,186	4,269	14,955	13,291
Secondary mortgage market operations	2,467	4,311	10,989	11,328
Insurance commissions and fees	3,661	4,045	12,500	12,103
Other income	9,526	9,770	26,649	31,101
Securities gains, net	'	917	'	929
Total noninterest income	63,057	63,759	187,141	188,817
Noninterest expense:	'	'	'	'
Compensation expense	73,037	76,173	215,715	223,945
Employee benefits	16,340	17,202	49,184	54,881
Personnel expense	89,377	93,375	264,899	278,826
Net occupancy expense	12,369	13,358	37,099	41,784
Equipment expense	5,127	5,212	15,347	19,046
Data processing expense	12,031	11,005	36,346	39,523
Professional services expense	10,899	9,447	27,571	49,207
Amortization of intangibles	7,306	8,110	22,292	24,336
Telecommunications and postage	4,397	5,313	13,484	17,068
Deposit insurance and regulatory fees	3,789	3,833	11,635	11,128
Advertising	2,858	2,243	7,216	12,263
Other expense	34,052	17,818	68,168	61,968
Total noninterest expense	182,205	169,714	504,057	555,149
Income before income taxes	44,813	63,200	172,404	138,530
Income taxes	11,611	16,216	43,764	33,747
Net income	$33,202	$46,984	$128,640	$104,783
Basic earnings per common share	$0.40	$0.55	$1.51	$1.23
Diluted earnings per common share	$0.40	$0.55	$1.51	$1.22
Dividends paid per share	$0.24	$0.24	$0.72	$0.72
Weighted avg. shares outstanding-basic	82,091	84,777	83,404	84,757
Weighted avg. shares outstanding-diluted	82,205	85,632	83,496	85,525

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net income	$33,202	$46,984	$128,640	$104,783
Other comprehensive income:	'	'	'	'
Net change in unrealized gains and losses	-9,685	10,821	-96,074	24,410
Reclassification adjustment for net losses realized and included in earnings	1,553	842	5,835	4,371
Amortization of unrealized net gain on securities transferred to held-to-maturity	-1,456	-2,725	-7,099	-5,645
Other comprehensive income, before income taxes	-9,588	8,938	-97,338	23,136
Income tax expense (benefit)	-3,512	3,263	-35,492	8,413
Other comprehensive (loss)/income	-6,076	5,675	-61,846	14,723
Comprehensive income	$27,126	$52,659	$66,794	$119,506

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), net [Member]
In Thousands, except Share data	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), net [Member]
Balance at Dec. 31, 2011	$2,367,163	$282,069	$1,634,634	$476,970	($26,510)
Balance, Shares at Dec. 31, 2011	'	84,705,496	'	'	'
Net income	104,783	'	'	104,783	'
Other comprehensive income	14,723	'	'	'	14,723
Comprehensive income	119,506	'	'	'	'
Cash dividends declared	-61,915	'	'	-61,915	'
Common stock activity, long-term incentive plan	9,734	254	9,480	'	'
Common stock activity, long-term incentive plan, shares	'	76,398	'	'	'
Balance at Sep. 30, 2012	2,434,488	282,323	1,644,114	519,838	-11,787
Balance, Shares at Sep. 30, 2012	'	84,781,894	'	'	'
Balance at Dec. 31, 2012	2,453,278	282,543	1,647,638	546,022	-22,925
Balance, Shares at Dec. 31, 2012	'	84,847,796	'	'	'
Net income	128,640	'	'	128,640	'
Other comprehensive income	-61,846	'	'	'	-61,846
Comprehensive income	66,794	'	'	128,640	-61,846
Cash dividends declared	-61,000	'	'	-61,000	'
Common stock activity, long-term incentive plan	12,370	256	12,114	'	'
Common stock activity, long-term incentive plan, shares	'	76,801	'	'	'
Purchase of common stock	-115,000	-9,383	-105,617	'	'
Purchase of common stock, shares	'	-2,817,640	'	'	'
Balance at Sep. 30, 2013	$2,356,442	$273,416	$1,554,135	$613,662	($84,771)
Balance, Shares at Sep. 30, 2013	'	82,106,957	'	'	'

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash dividends declared, per common share	$0.72	$0.72
Retained Earnings [Member]	'	'
Cash dividends declared, per common share	$0.72	$0.72

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'
Net income	$128,640	$104,783
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	24,178	25,228
Provision for loan losses	25,404	26,141
Losses on other real estate owned	3,519	17,901
Writedowns on closed branch transfers to other real estate owned	8,450	4,586
Deferred tax expense	20,807	35,557
Increase in cash surrender value of life insurance contracts	-8,764	-8,617
Net decrease in loans originated for sale	35,497	21,989
Net amortization of securities premium/discount	27,095	38,241
Amortization of intangible assets	22,292	24,390
Stock-based compensation expense	10,435	7,718
Increase (decrease) in interest payable and other liabilities	7,673	-38,797
Funds collected under FDIC loss share agreements	60,886	84,130
Increase in FDIC loss share receivable	-7,108	-55,690
Decrease in other assets	43,091	34,322
Other, net	9,092	-2,132
Net cash provided by operating activities	411,187	319,750
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'
Proceeds from sales of securities available for sale	'	37,661
Proceeds from maturities of securities available for sale	510,886	880,438
Purchases of securities available for sale	-1,017,578	-208,775
Proceeds from maturities of securities held to maturity	419,334	263,357
Purchases of securities held to maturity	-450,661	-560,435
Net decrease in interest-bearing bank deposits	1,052,369	865,590
Net increase in federal funds sold and short term investments	-14,493	-1,228
Net increase in loans	-229,913	-324,495
Purchases of property, equipment and intangible assets	-25,855	-34,815
Proceeds from sales of other real estate	70,220	76,427
Other, net	-7,280	5,919
Net cash provided by investing activities	307,029	999,644
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'
Net decrease in deposits	-689,317	-940,629
Net increase (decrease) in short-term borrowings	143,646	-295,820
Repayments of long-term debt	-26,469	-52,065
Issuance of long-term debt	6,544	6,502
Dividends paid	-61,000	-61,916
Repurchase of common stock	-115,000	'
Proceeds from exercise of stock options	582	1,210
Net cash used in financing activities	-741,014	-1,342,718
NET DECREASE IN CASH AND DUE FROM BANKS	-22,798	-23,324
CASH AND DUE FROM BANKS, BEGINNING	448,491	437,947
CASH AND DUE FROM BANKS, ENDING	425,693	414,623
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES	'	'
Assets acquired in settlement of loans	42,070	63,917
Transfers from available for sale securities to held to maturity securities	$983,162	$1,523,585

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation	'
	1. Basis of Presentation

	The consolidated financial statements include the accounts of Hancock Holding Company and all other entities in which it has a controlling interest (the “Company”). The financial statements include all adjustments that are, in the opinion of management, necessary to present fairly the Company’s financial condition, results of operations, changes in stockholders’ equity and cash flows for the interim periods presented. Some financial information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the U.S. (U.S. GAAP) have been condensed or omitted in this Form 10-Q pursuant to Securities and Exchange Commission rules and regulations. These financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s 2012 Annual Report on Form 10-K. Financial information reported in these financial statements is not necessarily indicative of the Company’s financial condition, results of operations, or cash flows for any other interim or annual period.

	Use of Estimates

	The accounting principles the Company follows and the methods for applying these principles conform with U.S. GAAP and with those generally practiced within the banking industry. These accounting principles require management to make estimates and assumptions about future events that affect the amounts reported in the consolidated financial statements and the accompanying notes. Actual results could differ from those estimates.

	Critical Accounting Policies and Estimates

	Allowance for Loan Losses

	The allowance for loan and lease losses (ALLL) is a valuation account available to absorb losses on loans. The ALLL is maintained at an amount sufficient to cover the estimated credit losses associated with the loan and lease portfolios of the Company as of the date of the determination. Credit losses arise not only from credit risk, but also from other risks inherent in the lending process including, but not limited to, collateral risk, operational risk, concentration risk, and economic risk. As such, all related risks of lending are considered when assessing the adequacy of the allowance for loan and lease losses. Quarterly, management estimates the inherent losses in the existing loan portfolio based on a number of factors, including the Company’s past loan loss and delinquency experience, known and inherent risks in the portfolio, adverse situations that may affect the borrowers’ ability to repay, the estimated value of any underlying collateral and current economic conditions.

	The analysis and methodology for estimating the ALLL include two primary elements. A loss rate analysis which incorporates a historical loss rate as updated for current conditions is used for loans collectively evaluated for impairment, and a specific reserve analysis is used for loans individually evaluated for impairment.

	During the second quarter of 2013, management revised the methodology for the loss-rate analysis for the originated and acquired-performing loan portfolios due to the increased size and complexity of the Company’s commercial loan portfolio. The primary changes in the methodology were to segment loans with similar risk characteristics at a more granular level and to lengthen the period used for analyzing loss emergence and estimating loss factors. The changes were implemented as of April 1, 2013 and resulted in no material change in the total amount of the allowance for loan losses. Management made the following principal changes to the methodology during the second quarter of 2013:



		•	Established a more granular stratification of the major loan segments to enhance the homogeneity of the loan classes. For the loss-rate analysis, the Company previously segmented loans into three primary groups—commercial, residential mortgage and consumer. The revised loan segments are commercial non-real estate, construction and land development, commercial real estate, residential mortgage and consumer. Both quantitative and qualitative factors are applied at the more detailed portfolio segments.


		•	Included portfolio risk ratings in loss-rate analysis. Commercial loans (commercial non-real estate, construction and land development and commercial real estate) are further subdivided by risk rating, and retail loans (residential mortgage and consumer) are further subdivided by delinquency. Previously, the methodology indirectly incorporated risk ratings and delinquencies.


		•	Lengthened the loss emergence period. The Company uses an eighteen month loss emergence period for commercial loans and a twelve month loss emergence period for retail loans. Historical loss rates are calculated for each commercial segment using a weighted average of three eighteen-month periods over a fourteen quarter look-back period, and for each retail segment using a weighted average of three twelve-month periods over a twelve quarter look-back period. Previously, historical loss rates for all loan segments were calculated using an average of three twelve month loss emergence periods over a three year look back period. As circumstances dictate, management will make adjustments to the loss history to reflect differences in current conditions as compared to those during the historical loss period. Conditions to be considered include problem loan trends, current business and economic conditions, credit concentrations, lending policies and procedures, lending staff, collateral values, loan profiles and volumes, loan review quality, and changes in competition and regulations.
	There were no changes in the methodology for the specific reserve analysis for loans individually evaluated for impairment or acquired credit-impaired loans.

	There were no other material changes or developments with respect to methodologies that the Company uses when applying what management believes are critical accounting policies and developing critical accounting estimates as disclosed in our Form 10-K for the year ended December 31, 2012.

Securities

Securities	9 Months Ended
Securities	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Securities	'
	2. Securities

	The amortized cost and fair value of securities classified as available for sale and held to maturity follow (in thousands):

	Securitites Available for Sale




			September 30, 2013												December 31, 2012
						Gross			Gross									Gross		Gross
			Amortized			Unrealized			Unrealized			Fair			Amortized			Unrealized		Unrealized		Fair
			Cost			Gains			Losses			Value			Cost			Gains		Losses		Value
	US Treasury and government agency securities		$	615		$	6		$	1		$	620		$	18,246		$	19	$	—	$	18,265
	Municipal obligations			43,573			197			122			43,648			49,608			571		14		50,165
	Mortgage-backed securities			1,337,251			29,214			6,495			1,359,970			1,715,524			58,903		21		1,774,406
	CMOs			46,288			—			1,256			45,032			196,723			1,354		—		198,077
	Corporate debt securities			3,500			—			—			3,500			2,250			—		—		2,250
	Other equity securities			4,596			774			20			5,350			4,531			752		4		5,279

			$	1,435,823		$	30,191		$	7,894		$	1,458,120		$	1,986,882		$	61,599	$	39	$	2,048,442

	Securitites Held to Maturity




			30-Sep-13												31-Dec-12
						Gross			Gross									Gross		Gross
			Amortized			Unrealized			Unrealized			Fair			Amortized			Unrealized		Unrealized		Fair
			Cost			Gains			Losses			Value			Cost			Gains		Losses		Value
	US Treasury and government agency securities		$	100,000		$	688		$	—		$	100,688		$	—		$	—	$	—	$	—
	Municipal obligations			195,662			1,137			5,291			191,508			164,493			16,017		—		180,510
	Mortgage-backed securities			995,686			9,273			2,118			1,002,841			180,397			3,429		—		183,826
	CMOs			1,374,734			2,615			18,519			1,358,830			1,323,128			23,942		941		1,346,129

			$	2,666,082		$	13,713		$	25,928		$	2,653,867		$	1,668,018		$	43,388	$	941	$	1,710,465

	During the third quarter of 2013, approximately $1.0 billion of securities available for sale were reclassified as securities held to maturity. Management determined that the reclassified securities were not needed for liquidity purposes and that the Company had the ability and intent to hold the securities to maturity. The reclassified securities consisted of mortgage-backed securities and CMOs. The securities were transferred at fair value on the date of their reclassification, which became the cost basis for the securities held to maturity. The unrealized net holding loss on the available for sale securities on the date of transfer totaled approximately $56.8 million, and continues to be reported, net of tax, as a component of accumulated other comprehensive income. This net unrealized loss will be amortized to interest income over the remaining life of the securities as a yield adjustment, which will serve to offset the impact of the accretion of the net discount created in the transfer. There were no gains or losses recognized as a result of this transfer.

	The following table presents the amortized cost and fair value of debt securities at September 30, 2013 by final contractual maturity (in thousands). Actual maturities will differ from final contractual maturities because of scheduled and early principal payments on mortgage-backed securities and CMOs and rights to call or repay other obligations with or without penalties.




			Amortized			Fair
			Cost			Value
	Debt Securities Available for Sale
	Due in one year or less		$	23,895		$	24,010
	Due after one year through five years			130,419			130,124
	Due after five years through ten years			154,962			161,485
	Due after ten years			1,121,951			1,137,151

	Total available for sale debt securities		$	1,431,227		$	1,452,770


			Amortized			Fair
			Cost			Value
	Debt Securities Held to Maturity
	Due in one year or less		$	107,697		$	108,407
	Due after one year through five years			669,896			655,554
	Due after five years through ten years			121,588			117,864
	Due after ten years			1,766,901			1,772,042

Total held to maturity securities		$	2,666,082		$	2,653,867

The Company held no securities classified as trading at September 30, 2013 or December 31, 2012.

The details for securities classified as available for sale with unrealized losses as of September 30, 2013 follow (in thousands):




		Losses < 12 months						Losses 12 months or >						Total
					Gross						Gross						Gross
		Fair			Unrealized			Fair			Unrealized			Fair			Unrealized
		Value			Losses			Value			Losses			Value			Losses
US Treasury and government agency securities		$	—		$	—		$	104		$	1		$	104		$	1
Municipal obligations			13,647			122			—			—			13,647			122
Mortgage-backed securities			144,859			6,488			379			7			145,238			6,495
CMOs			45,032			1,256			—			—			45,032			1,256
Equity securities			3,290			19			2			1			3,292			20

		$	206,828		$	7,885		$	485		$	9		$	207,313		$	7,894



The details for securities classified as available for sale with unrealized losses as of December 31, 2012 follows (in thousands):




		Losses < 12 months						Losses 12 months or >						Total
					Gross						Gross						Gross
		Fair			Unrealized			Fair			Unrealized			Fair			Unrealized
		Value			Losses			Value			Losses			Value			Losses
Municipal obligations		$	5,278		$	14		$	—		$	—		$	5,278		$	14
Mortgage-backed securities			57,752			14			1,097			7			58,849			21
Equity securities			268			2			2			2			270			4

		$	63,298		$	30		$	1,099		$	9		$	64,397		$	39

The details for securities classified as held to maturity with unrealized losses as of September 30, 2013 follows (in thousands):




		Losses < 12 months						Losses 12 months or >						Total
					Gross						Gross						Gross
		Fair			Unrealized			Fair			Unrealized			Fair			Unrealized
		Value			Losses			Value			Losses			Value			Losses
Municpal obligations		$	115,901		$	5,252		$	1,253		$	39		$	117,154		$	5,291
Mortgage-backed securities			147,019			2,118			—			—			147,019			2,118
CMOs			720,157			17,377			280,855			1,142			1,001,012			18,519

		$	983,077		$	24,747		$	282,108		$	1,181		$	1,265,185		$	25,928

The details for securities classified as held to maturity with unrealized losses as of December 31, 2012 follows (in thousands):




		Losses < 12 months						Losses 12 months or >						Total
					Gross						Gross						Gross
		Fair			Unrealized			Fair			Unrealized			Fair			Unrealized
		Value			Losses			Value			Losses			Value			Losses
CMOs		$	87,852		$	259		$	54,445		$	682		$	142,297		$	941

		$	87,852		$	259		$	54,445		$	682		$	142,297		$	941

Substantially all of the unrealized losses relate to changes in market rates on fixed-rate debt securities since the respective purchase dates. In all cases, the indicated impairment would be recovered no later than the security’s maturity date or possibly earlier if the market price for the security increases with a reduction in the yield required by the market. None of the unrealized losses relate to the marketability of the securities or the obligor’s ability to meet contractual obligations. The Company has adequate liquidity and, therefore, does not plan to and, more likely than not, will not be required to sell these securities before full recovery of the indicated impairment. Accordingly, the unrealized losses on these securities have been determined to be temporary.

Securities with carrying values totaling $2.6 billion at both September 30, 2013 and December 31, 2012 were pledged primarily to secure public deposits or securities sold under agreements to repurchase.

Loans_and_Allowance_for_Loan_L

Loans and Allowance for Loan Losses	9 Months Ended
Loans and Allowance for Loan Losses	Sep. 30, 2013
Receivables [Abstract]	'
Loans and Allowance for Loan Losses	'
	3. Loans and Allowance for Loan Losses

	Loans, net of unearned income, consisted of the following:




			September 30,			December 31,
			2013			2012
			(In thousands)
	Originated loans:
	Commercial non-real estate		$	3,633,490		$	2,713,385
	Construction and land development			738,983			665,673
	Commercial real estate			1,816,402			1,548,402
	Residential mortgages			1,124,649			827,985
	Consumer			1,387,243			1,351,776

	Total originated loans		$	8,700,767		$	7,107,221

	Acquired loans:
	Commercial non-real estate		$	967,485		$	1,690,643
	Construction and land development			158,228			295,151
	Commercial real estate			1,038,287			1,279,546
	Residential mortgages			347,054			486,444
	Consumer			130,649			202,974

	Total acquired loans		$	2,641,703		$	3,954,758

	Covered loans:
	Commercial non-real estate		$	24,340		$	29,260
	Construction and land development			23,197			28,482
	Commercial real estate			60,280			95,146
	Residential mortgages			223,494			263,515
	Consumer			60,691			99,420

	Total covered loans		$	392,002		$	515,823

	Total loans:
	Commercial non-real estate		$	4,625,315		$	4,433,288
	Construction and land development			920,408			989,306
	Commercial real estate			2,914,969			2,923,094
	Residential mortgages			1,695,197			1,577,944
	Consumer			1,578,583			1,654,170

	Total loans		$	11,734,472		$	11,577,802



	The following briefly describes the distinction between originated, acquired and covered loans and certain significant accounting policies relevant to each category.

	Originated loans

	Loans originated for investment are reported at the principal balance outstanding net of unearned income. Interest on loans and accretion of unearned income are computed in a manner that approximates a level yield on recorded principal. Interest on loans is recorded as income as earned. The accrual of interest on an originated loan is discontinued when it is probable that the borrower will not be able to meet payment obligations as they become due. The Company maintains an allowance for loan losses on originated loans that represents management’s estimate of probable losses incurred in this portfolio category. The methodology for estimating the allowance is described in Note 1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2012. See Note 1 elsewhere in this document for updates to the allowance methodology for originated and acquired-performing loans. As actual losses are incurred, they are charged against the allowance. Subsequent recoveries are added back to the allowance when collected.

	Acquired loans

	Acquired loans are those loans that were purchased in the Whitney Holding Corporation acquisition on June 4, 2011. These loans were recorded at estimated fair value at the acquisition date with no carryover of the related allowance for loan losses. The acquired loans were segregated between those considered to be performing (“acquired-performing”) and those with evidence of credit deterioration (“acquired-impaired”), and then further segregated into loan pools designed to facilitate the development of expected cash flows. The factors considered in segregating the acquired portfolio are detailed in Note 1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2012. The fair value estimate for each pool of acquired-performing and acquired-impaired loans was based on the estimate of expected cash flows, both principal and interest, from that pool, discounted at prevailing market interest rates.

	The difference at the acquisition date between the fair value and the contractual amounts due of an acquired-performing loan pool (the “fair value discount”) is accreted into income over the estimated life of the pool. Management estimates an allowance for loan losses for acquired-performing loans using a methodology similar to that used for originated loans. The allowance determined for each loan pool is compared to the remaining fair value discount for that pool. If the allowance is greater than the fair value discount, the excess is added to the reported allowance through a provision for loan losses. If the allowance is less than the fair value discount, no additional allowance or provision is recognized. Actual losses first reduce any remaining fair value discount for the loan pool. Once the discount is fully depleted, losses are applied against the allowance established for that pool. Acquired-performing loans are placed on nonaccrual status and considered and reported as nonperforming or past due using the same criteria applied to the originated portfolio.

	The excess of cash flows expected to be collected from an acquired-impaired loan pool over the pool’s carrying value is referred to as the accretable yield and is recognized in interest income using an effective yield method over the remaining life of the pool. Each pool of acquired-impaired loans is accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows.

	Acquired-impaired loans in pools with an accretable yield and expected cash flows that are reasonably estimable are considered to be accruing and performing even though collection of contractual payments on individual loans within the pool may be in doubt, because the pool is the unit of accounting. Management recasts the estimate of cash flows expected to be collected on each acquired-impaired loan pool at each reporting date. If the present value of expected cash flows for a pool is less than its carrying value, impairment is recognized by an increase in the allowance for loan losses and a charge to the provision for loan losses. If the present value of expected cash flows for a pool is greater than its carrying value, any previously established allowance for loan losses is reversed and any remaining difference increases the accretable yield which will be taken into interest income over the remaining life of the loan pool. Acquired-impaired loans are generally not subject to individual evaluation for impairment and are not reported with impaired loans or troubled debt restructurings, even if they would otherwise qualify for such treatment.

Covered loans and the related loss share receivable

The loans purchased in the 2009 acquisition of Peoples First Community Bank (Peoples First) are covered by two loss share agreements between the FDIC and the Company that afford the Company significant loss protection. These covered loans are accounted for as acquired-impaired loans as described above. The loss share receivable is measured separately from the related covered loans as it is not contractually embedded in the loans and is not transferable if the loans are sold. The fair value of the loss share receivable at acquisition was estimated by discounting projected cash flows related to the loss share agreements based on the expected reimbursements for losses using the applicable loss share percentages, including appropriate consideration of possible true-up payments to the FDIC at the expiration of the agreements. The discounted amount is accreted into non-interest income over the shorter of the remaining life of the covered loan pool or the life of the loss share agreement.

The loss share receivable is reviewed and updated prospectively as loss estimates related to the covered loans change. Increases in expected reimbursements under the loss sharing agreements from a covered loan pool will lead to an increase in the loss share receivable. A decrease in expected reimbursements is reflected first as a reversal of any previously recorded increase in the loss share receivable on the covered loan pool with the remainder reflected as a reduction in the loss share receivable’s accretion rate. Increases and decreases in the loss share receivable can result in reductions in or additions to the provision for loan losses, which serve to offset the impact on the provision from impairment recognized on the underlying covered loan pool and reversals of previously recognized impairment. The impact on operations of a reduction in the loss share receivable’s accretion rate is associated with an increase in the accretable yield on the underlying loan pool.



The following schedule shows activity in the loss share receivable for the nine months ended September 30, 2013 and 2012 (in thousands):




		Nine Months Ended
		September 30,			September 30,
		2013			2012
Balance, January 1		$	177,844		$	231,085
Accretion (amortization)			(590	)		5,000
Charge-offs, write-downs and other losses			(190	)		36,685
External expenses qualifying under loss share agreement			7,918			7,422
Payments received from the FDIC			(60,886	)		(84,130	)

Ending balance		$	124,096		$	196,062

In the following discussion and tables, certain disaggregated information was not available for the commercial non-real estate, construction and land development and commercial real estate loan categories for 2012. In these instances, combined information for these categories is provided under the caption “commercial loans.”

The following schedule shows activity in the allowance for loan losses by portfolio segment for the nine months ended September 30, 2013 and September 30, 2012 as well as the corresponding recorded investment in loans at the end of each period.




					Construction
		Commercial			and land			Commercial			Residential
		non-real estate			development			real estate			mortgages			Consumer			Total
(In thousands)		Nine Months Ended September 30, 2013
Originated loans
Allowance for loan losses:
Beginning balance		$	20,775		$	11,415		$	26,959		$	6,406		$	13,219		$	78,774
Charge-offs			(5,199	)		(7,548	)		(3,718	)		(1,549	)		(13,372	)		(31,386	)
Recoveries			3,381			1,243			2,340			991			4,336			12,291
Net provision for loan losses			11,152			2,072			(3,698	)		64			8,152			17,742

Ending balance		$	30,109		$	7,182		$	21,883		$	5,912		$	12,335		$	77,421

Ending balance:
Individually evaluated for impairment		$	325		$	211		$	946		$	—		$	—		$	1,482
Collectively evaluated for impairment		$	29,784		$	6,971		$	20,937		$	5,912		$	12,335		$	75,939
Loans:
Ending balance:		$	3,633,490		$	738,983		$	1,816,402		$	1,124,649		$	1,387,243		$	8,700,767
Individually evaluated for impairment		$	8,911		$	16,044		$	21,170		$	—		$	—		$	46,125
Collectively evaluated for impairment		$	3,624,579		$	722,939		$	1,795,232		$	1,124,649		$	1,387,243		$	8,654,642

Acquired loans
Allowance for loan losses:
Beginning balance		$	788		$	—		$	—		$	—		$	—		$	788
Charge-offs			—			—			—			—			—			—
Recoveries			—			—			—			—			—			—
Net provision for loan losses			(788	)		—			463			—			—			(325	)

Ending balance		$	—		$	—		$	463		$	—		$	—		$	463

Ending balance:
Individually evaluated for impairment		$	—		$	—		$	463		$	—		$	—		$	463
Collectively evaluated for impairment		$	—		$	—		$	—		$	—		$	—		$	—
Acquired-impaired		$	—		$	—		$	—		$	—		$	—		$	—
Loans:
Ending balance:		$	967,485		$	158,228		$	1,038,287		$	347,054		$	130,649		$	2,641,703
Individually evaluated for impairment		$	2,179		$	730		$	2,371		$	502		$	—		$	5,782
Collectively evaluated for impairment		$	946,339		$	142,418		$	1,010,484		$	341,165		$	130,544		$	2,570,950
Acquired-impaired		$	18,967		$	15,080		$	25,432		$	5,387		$	105		$	64,971




					Construction
		Commercial			and land			Commercial			Residential
		non-real estate			development			real estate			mortgages			Consumer			Total
(In thousands)		Nine Months Ended September 30, 2013
Covered loans
Allowance for loan losses:
Beginning balance		$	2,162		$	5,623		$	9,433		$	30,471		$	8,920		$	56,609
Charge-offs			(681	)		(1,784	)		(4,316	)		(947	)		(1,145	)		(8,873	)
Recoveries			90			554			2,395			13			67			3,119
Net provision for loan losses (a)			(328	)		(1,600	)		1,197			4,723			3,995			7,987
Increase in FDIC loss share receivable (a)			447			(314	)		(732	)		1,261			835			1,497

Ending balance		$	1,690		$	2,479		$	7,977		$	35,521		$	12,672		$	60,339

Ending balance:
Individually evaluated for impairment		$	—		$	—		$	—		$	—		$	—		$	—
Collectively evaluated for impairment		$	—		$	—		$	—		$	—		$	—		$	—
Amounts related to loans acquired with deteriorated credit quality		$	1,690		$	2,479		$	7,977		$	35,521		$	12,672		$	60,339
Loans:
Ending balance:		$	24,340		$	23,197		$	60,280		$	223,494		$	60,691		$	392,002
Individually evaluated for impairment		$	—		$	—		$	—		$	—		$	—		$	—
Collectively evaluated for impairment		$	—		$	—		$	—		$	—		$	—		$	—
Acquired-impaired		$	24,340		$	23,197		$	60,280		$	223,494		$	60,691		$	392,002

Total loans
Allowance for loan losses:
Beginning balance		$	23,725		$	17,038		$	36,392		$	36,877		$	22,139		$	136,171
Charge-offs			(5,880	)		(9,332	)		(8,034	)		(2,496	)		(14,517	)		(40,259	)
Recoveries			3,471			1,797			4,735			1,004			4,403			15,410
Net provision for loan losses (a)			10,036			472			(2,038	)		4,787			12,147			25,404
Increase in FDIC loss share receivable (a)			447			(314	)		(732	)		1,261			835			1,497

Ending balance		$	31,799		$	9,661		$	30,323		$	41,433		$	25,007		$	138,223

Ending balance:
Individually evaluated for impairment		$	325		$	211		$	1,409		$	—		$	—		$	1,945
Collectively evaluated for impairment		$	29,784		$	6,971		$	20,937		$	5,912		$	12,335		$	75,939
Acquired-impaired		$	1,690		$	2,479		$	7,977		$	35,521		$	12,672		$	60,339
Loans:
Ending balance:		$	4,625,315		$	920,408		$	2,914,969		$	1,695,197		$	1,578,583		$	11,734,472
Individually evaluated for impairment		$	11,090		$	16,774		$	23,541		$	502		$	—		$	51,907
Collectively evaluated for impairment		$	4,570,918		$	865,357		$	2,805,716		$	1,465,814		$	1,517,787		$	11,225,592
Acquired-impaired		$	43,307		$	38,277		$	85,712		$	228,881		$	60,796		$	456,973



(a)	The $8.0 million provision expense for impairment on certain pools of covered loans is reported net of the benefit attributable to the FDIC loss share agreement as reflected by the related increase in the loss share receivable.



					Residential
		Commercial			mortgages			Consumer			Total
(In thousands)		Nine Months Ended September 30, 2012
Originated loans
Allowance for loan losses:
Beginning balance		$	60,211		$	4,894		$	18,141		$	83,246
Charge-offs			(18,036	)		(4,889	)		(11,663	)		(34,588	)
Recoveries			4,225			310			3,060			7,595
Net provision for loan losses			12,618			4,336			6,542			23,496

Ending balance		$	59,018		$	4,651		$	16,080		$	79,749

Ending balance:
Individually evaluated for impairment		$	8,469		$	133		$	—		$	8,602
Collectively evaluated for impairment		$	50,549		$	4,518		$	16,080		$	71,147
Loans:
Ending balance:		$	4,465,736		$	757,471		$	1,357,987		$	6,581,194
Individually evaluated for impairment		$	78,337		$	7,524		$	—		$	85,861
Collectively evaluated for impairment		$	4,387,399		$	749,947		$	1,357,987		$	6,495,333

Covered loans
Allowance for loan losses:
Beginning balance		$	18,203		$	9,024		$	14,408		$	41,635
Charge-offs			(22,839	)		—			—			(22,839	)
Recoveries			—			—			—			—
Net provision for loan losses (a)			12,744			2,196			(12,295	)		2,645
Increase in FDIC loss share receivable (a)			22,650			11,189			562			34,401

Ending balance		$	30,758		$	22,409		$	2,675		$	55,842

Ending balance:
Individually evaluated for impairment		$	—		$	—		$	—		$	—
Collectively evaluated for impairment		$	—		$	—		$	—		$	—
Acquired-impaired		$	30,758		$	22,409		$	2,675		$	55,842
Loans:
Ending balance:		$	176,724		$	271,618		$	107,390		$	555,732
Individually evaluated for impairment		$	—		$	—		$	—		$	—
Collectively evaluated for impairment		$	—		$	—		$	—		$	—
Acquired-impaired		$	176,724		$	271,618		$	107,390		$	555,732




		Commercial			Residential			Consumer			Total
		Commercial			mortgages			Consumer			Total
(In thousands)		Nine Months Ended September 30, 2012
Total loans
Allowance for loan losses:
Beginning balance		$	78,414		$	13,918		$	32,549		$	124,881
Charge-offs			(40,875	)		(4,889	)		(11,663	)		(57,427	)
Recoveries			4,225			310			3,060			7,595
Net provision for loan losses (a)			25,362			6,532			(5,753	)		26,141
Increase in FDIC loss share receivable (a)			22,650			11,189			562			34,401

Ending balance		$	89,776		$	27,060		$	18,755		$	135,591

Ending balance:
Individually evaluated for impairment		$	8,469		$	133		$	—		$	8,602
Collectively evaluated for impairment		$	50,549		$	4,518		$	16,080		$	71,147
Acquired-impaired		$	30,758		$	22,409		$	2,675		$	55,842
Loans:
Ending balance:		$	8,187,469		$	1,561,640		$	1,685,339		$	11,434,448
Individually evaluated for impairment		$	78,337		$	7,524		$	—		$	85,861
Collectively evaluated for impairment (b)		$	7,758,832		$	1,259,767		$	1,577,265		$	10,595,864
Acquired-impaired		$	350,300		$	294,349		$	108,074		$	752,723



(a)	The $2.6 million provision expense for impairment on certain pools of covered loans is reported net of the benefit attributable to the FDIC loss share agreements as reflected by the related increase in the loss share receivable.
(b)	In accordance with purchase accounting rules, acquired non-impaired loans were recorded at their fair value at the time of acquisition with no carryover of losses and are included in the ending balance of loans collectively evaluated for impairment. No allowance had been established on these acquired loans as of September 30, 2012.


The following tables show the composition of nonaccrual loans by portfolio segment and class. Acquired-impaired and certain covered loans are considered to be performing due to the application of the accretion method and are excluded from the table. Covered loans accounted for using the cost recovery method do not have an accretable yield and are disclosed below as nonaccrual loans. Acquired-performing loans that have subsequently been placed on nonaccrual status are also disclosed below.




(In thousands)		September 30,			December 31,
(In thousands)		2013			2012
Originated loans:
Commercial non-real estate		$	14,118		$	18,941
Construction and land development			19,817			32,777
Commercial real estate			39,695			40,190
Residential mortgages			13,148			7,705
Consumer			4,684			3,815

Total originated loans		$	91,462		$	103,428

Acquired loans:
Commercial non-real estate		$	3,381		$	4,326
Construction and land development			2,025			5,967
Commercial real estate			6,123			6,609
Residential mortgages			9,664			10,551
Consumer			1,890			2,634

Total acquired loans		$	23,083		$	30,087

Covered loans:
Commercial non-real estate		$	3		$	—
Construction and land development			2,624			2,487
Commercial real estate			1,179			1,220
Residential mortgages			942			393
Consumer			415			—

Total covered loans		$	5,163		$	4,100

Total loans:
Commercial non-real estate		$	17,502		$	23,267
Construction and land development			24,466			41,231
Commercial real estate			46,997			48,019
Residential mortgages			23,754			18,649
Consumer			6,989			6,449

Total loans		$	119,708		$	137,615



The amount of interest that would have been recognized on nonaccrual loans for the nine months ended September 30, 2013 was approximately $4.9 million. Interest actually received and taken into income on nonaccrual loans during the nine months ended September 30, 2013 was $4.1 million.

Included in nonaccrual loans at September 30, 2013 is $19.1 million in restructured commercial loans. Total troubled debt restructurings (TDRs) were $29.7 million as of September 30, 2013 and $32.2 million at December 31, 2012. Individual acquired and covered impaired loans modified post-acquisition are not removed from their accounting pool and accounted for as TDRs, even if those loans would otherwise be deemed TDRs.

The table below details TDRs that occurred during the nine months ended September 30, 2013 and September 30, 2012 by portfolio segment and TDRs that subsequently defaulted within twelve months of modification (dollar amounts in thousands). All troubled debt restructurings are rated substandard and individually evaluated for impairment.




		Nine Months Ended
		September 30, 2013									September 30, 2012
					Pre-Modification			Post-Modification						Pre-Modification			Post-Modification
					Outstanding			Outstanding						Outstanding			Outstanding
		Number of			Recorded			Recorded			Number of			Recorded			Recorded
Troubled Debt Restructurings:		Contracts			Investment			Investment			Contracts			Investment			Investment
Originated loans:
Commercial non-real estate			1		$	926		$	913			1		$	790		$	790
Construction and land development			—			—			—			—			—			—
Commercial real estate			4			1,332			1,270			9			9,475			8,582
Residential mortgages			1			456			343			2			711			561
Consumer			—			—			—			—			—			—

Total originated loans			6		$	2,714		$	2,526			12		$	10,976		$	9,933

Aquired loans:
Commercial non-real estate			—		$	—		$	—			—		$	—		$	—
Construction and land development			—			—			—			—			—			—
Commercial real estate			1			512			476			—			—			—
Residential mortgages			1			514			500			—			—			—
Consumer			—			—			—			—			—			—

Total acquired loans			2		$	1,026		$	976			—		$	—		$	—

Covered loans:
Commercial non-real estate			—		$	—		$	—			—		$	—		$	—
Construction and land development			—			—			—			—			—			—
Commercial real estate			—			—			—			—			—			—
Residential mortgages			—			—			—			—			—			—
Consumer			—			—			—			—			—			—

Total covered loans			—		$	—		$	—			—		$	—		$	—

Total loans:
Commercial non-real estate			1		$	926		$	913			1		$	790		$	790
Construction and land development			—			—			—			—			—			—
Commercial real estate			5			1,844			1,746			9			9,475			8,582
Residential mortgages			2			970			843			2			711			561
Consumer			—			—			—			—			—			—

Total loans			8		$	3,740		$	3,502			12		$	10,976		$	9,933




					Nine Months Ended
		September 30, 2013						September 30, 2012
Troubled Debt Restructurings That Subsequently Defaulted:		Number of			Recorded			Number of			Recorded
Troubled Debt Restructurings That Subsequently Defaulted:		Contracts			Investment			Contracts			Investment
Originated loans:
Commercial non-real estate			—		$	—			—		$	—
Construction and land development			—			—			—			—
Commercial real estate			—			—			2			1,787
Residential mortgages			—			—			—			—
Consumer			—			—			—			—

Total originated loans			—		$	—			2		$	1,787

Aquired loans:
Commercial non-real estate			—		$	—			—		$	—
Construction and land development			—			—			—			—
Commercial real estate			—			—			—			—
Residential mortgages			—			—			—			—
Consumer			—			—			—			—

Total acquired loans			—		$	—			—		$	—

Covered loans:
Commercial non-real estate			—		$	—			—		$	—
Construction and land development			—			—			—			—
Commercial real estate			—			—			—			—
Residential mortgages			—			—			—			—
Consumer			—			—			—			—

Total covered loans			—		$	—			—		$	—

Total loans:
Commercial non-real estate			—		$	—			—		$	—
Construction and land development			—			—			—			—
Commercial real estate			—			—			2			1,787
Residential mortgages			—			—			—			—
Consumer			—			—			—			—

Total loans			—		$	—			2		$	1,787



Loans that are risk rated substandard and doubtful are reviewed for impairment. Those loans that are determined to be impaired and greater than $1 million are individually evaluated for impairment. The tables below present loans that are individually evaluated for impairment disaggregated by class at September 30, 2013 and December 31, 2012:




					Unpaid						Average			Interest
		Recorded			Principal			Related			Recorded			Income
September 30, 2013		Investment			Balance			Allowance			Investment			Recognized
								(In thousands)
Originated loans:
With no related allowance recorded:
Commercial non-real estate		$	848		$	1,073		$	—		$	212		$	12
Construction and land development			9,798			11,431			—			2,450			53
Commercial real estate			6,608			8,430			—			18,527			344
Residential mortgages			—			—			—			328			—
Consumer			—			—			—			1,267			—

			17,254			20,934			—			22,784			409
With an allowance recorded:
Commercial non-real estate			8,063			8,365			325			9,929			167
Construction and land development			6,246			6,246			211			1,562			40
Commercial real estate			14,562			14,866			946			22,427			413
Residential mortgages			—			—			—			134			—
Consumer			—			—			—			1,281			—

			28,871			29,477			1,482			35,333			620
Total:
Commercial non-real estate			8,911			9,438			325			10,141			179
Construction and land development			16,044			17,677			211			4,012			93
Commercial real estate			21,170			23,296			946			40,954			757
Residential mortgages			—			—			—			462			—
Consumer			—			—			—			2,548			—

Total originated loans		$	46,125		$	50,411		$	1,482		$	58,117		$	1,029

Acquired loans:
With no related allowance recorded:
Commercial non-real estate		$	2,179		$	2,186		$	—		$	545		$	—
Construction and land development			730			754			—			183			—
Commercial real estate			476			486			—			1,079			47
Residential mortgages			502			509			—			382			—
Consumer			—			—			—			—			—

			3,887			3,935			—			2,189			47
With an allowance recorded:
Commercial non-real estate			—			—			—			3,434			63
Construction and land development			—			—			—			197			—
Commercial real estate			1,895			1,931			463			3,328			—
Residential mortgages			—			—			—			1,057			—
Consumer			—			—			—			—			—

			1,895			1,931			463			8,016			63
Total:
Commercial non-real estate			2,179			2,186			—			3,979			63
Construction and land development			730			754			—			380			—
Commercial real estate			2,371			2,417			463			4,407			47
Residential mortgages			502			509			—			1,439			—
Consumer			—			—			—			—			—

Total acquired loans		$	5,782		$	5,866		$	463		$	10,205		$	110




					Unpaid						Average			Interest
		Recorded			Principal			Related			Recorded			Income
September 30, 2013		Investment			Balance			Allowance			Investment			Recognized
Covered loans:
With no related allowance recorded:
Commercial non-real estate		$	—		$	—		$	—		$	—		$	—
Construction and land development			—			—			—			—			—
Commercial real estate			—			—			—			—			—
Residential mortgages			—			—			—			—			—
Consumer			—			—			—			—			—

			—			—			—			—			—
With an allowance recorded:
Commercial non-real estate			—			—			—			—			—
Construction and land development			—			—			—			—			—
Commercial real estate			—			—			—			—			—
Residential mortgages			—			—			—			—			—
Consumer			—			—			—			—			—

			—			—			—			—			—
Total:
Commercial non-real estate			—			—			—			—			—
Construction and land development			—			—			—			—			—
Commercial real estate			—			—			—			—			—
Residential mortgages			—			—			—			—			—
Consumer			—			—			—			—			—

Total covered loans		$	—		$	—		$	—		$	—		$	—

Total loans:
With no related allowance recorded:
Commercial non-real estate		$	3,027		$	3,259		$	—		$	757		$	12
Construction and land development			10,528			12,185			—			2,633			53
Commercial real estate			7,084			8,916			—			19,606			391
Residential mortgages			502			509			—			710			—
Consumer			—			—			—			1,267			—

			21,141			24,869			—			24,973			456
With an allowance recorded:
Commercial non-real estate			8,063			8,365			325			13,363			230
Construction and land development			6,246			6,246			211			1,759			40
Commercial real estate			16,457			16,797			1,409			25,755			413
Residential mortgages			—			—			—			1,191			—
Consumer			—			—			—			1,281			—

			30,766			31,408			1,945			43,349			683
Total:
Commercial non-real estate			11,090			11,624			325			14,120			242
Construction and land development			16,774			18,431			211			4,392			93
Commercial real estate			23,541			25,713			1,409			45,361			804
Residential mortgages			502			509			—			1,901			—
Consumer			—			—			—			2,548			—

Total loans		$	51,907		$	56,277		$	1,945		$	68,322		$	1,139




					Unpaid						Average			Interest
		Recorded			Principal			Related			Recorded			Income
December 31, 2012		Investment			Balance			Allowance			Investment			Recognized
								(In thousands)
Originated loans:
With no related allowance recorded:
Commercial		$	34,705		$	55,101		$	—		$	23,793		$	464
Residential mortgages			2,721			4,874			—			3,255			155
Consumer			—			—			—			—			—

			37,426			59,975			—			27,048			619
With an allowance recorded:
Commercial			35,850			37,917			6,377			41,232			703
Residential mortgages			—			—			—			4,619			—
Consumer			—			—			—			—			—

			35,850			37,917			6,377			45,851			703
Total:
Commercial			70,555			93,018			6,377			65,025			1,167
Residential mortgages			2,721			4,874			—			7,874			155
Consumer			—			—			—			—			—

Total originated loans		$	73,276		$	97,892		$	6,377		$	72,899		$	1,322

Acquired loans:
With no related allowance recorded:
Commercial		$	—		$	—		$	—		$	—		$	—
Residential mortgages			—			—			—			—			—
Consumer			—			—			—			—			—

			—			—			—			—			—
With an allowance recorded:
Commercial			6,202			6,386			788			1,551			—
Residential mortgages			—			—			—			—			—
Consumer			—			—			—			—			—

			6,202			6,386			788			1,551			—
Total:
Commercial			6,202			6,386			788			1,551			—
Residential mortgages			—			—			—			—			—
Consumer			—			—			—			—			—

Total acquired loans		$	6,202		$	6,386		$	788		$	1,551		$	—




					Unpaid						Average			Interest
		Recorded			Principal			Related			Recorded			Income
December 31, 2012		Investment			Balance			Allowance			Investment			Recognized
								(In thousands)
Covered loans:
With no related allowance recorded:
Commercial		$	3,707		$	10,208		$	—		$	6,008		$	—
Residential mortgages			393			787			—			446			—
Consumer			—			—			—			—			—

			4,100			10,995			—			6,454			—
With an allowance recorded:
Commercial			—			—			—			—			—
Residential mortgages			—			—			—			—			—
Consumer			—			—			—			—			—

			—			—			—			—			—
Total:
Commercial			3,707			10,208			—			6,008			—
Residential mortgages			393			787			—			446			—
Consumer			—			—			—			—			—

Total covered loans		$	4,100		$	10,995		$	—		$	6,454		$	—

Total loans:
With no related allowance recorded:
Commercial		$	38,412		$	65,309		$	—		$	29,801		$	464
Residential mortgages			3,114			5,661			—			3,701			155
Consumer			—			—			—			—			—

			41,526			70,970			—			33,502			619
With an allowance recorded:
Commercial			42,052			44,303			7,165			42,783			703
Residential mortgages			—			—			—			4,619			—
Consumer			—			—			—			—			—

			42,052			44,303			7,165			47,402			703
Total:
Commercial			80,464			109,612			7,165			72,584			1,167
Residential mortgages			3,114			5,661			—			8,320			155
Consumer			—			—			—			—			—

Total loans		$	83,578		$	115,273		$	7,165		$	80,904		$	1,322



Covered loans and acquired credit impaired loans with an accretable yield are considered to be current in the following delinquency table. Certain covered loans accounted for using the cost recovery method are disclosed according to their contractual payment status below. The following table presents the age analysis of past due loans at September 30, 2013 and December 31, 2012:




																				Recorded
								Greater than												investment
		30-59 days			60-89 days			90 days			Total						Total			> 90 days
30-Sep-13		past due			past due			past due			past due			Current			Loans			and accruing
											(In thousands)
Originated loans:
Commercial non-real estate		$	7,369		$	2,891		$	9,615		$	19,875		$	3,613,615		$	3,633,490		$	1,268
Construction and land development			2,083			2,131			18,079			22,293			716,690			738,983			8,183
Commercial real estate			11,753			2,215			16,383			30,351			1,786,051			1,816,402			1,309
Residential mortgages			224			2,484			4,018			6,726			1,117,923			1,124,649			—
Consumer			4,974			2,238			3,686			10,898			1,376,345			1,387,243			1,752

Total		$	26,403		$	11,959		$	51,781		$	90,143		$	8,610,624		$	8,700,767		$	12,512

Acquired loans:
Commercial non-real estate		$	1,586		$	414		$	1,396		$	3,396		$	964,089		$	967,485		$	700
Construction and land development			1,481			897			594			2,972			155,256			158,228			56
Commercial real estate			2,548			703			5,763			9,014			1,029,273			1,038,287			2,306
Residential mortgages			594			970			6,337			7,901			339,153			347,054			—
Consumer			393			158			1,033			1,584			129,065			130,649			46

Total		$	6,602		$	3,142		$	15,123		$	24,867		$	2,616,836		$	2,641,703		$	3,108

Covered loans:
Commercial non-real estate		$	—		$	—		$	—		$	—		$	24,340		$	24,340		$	—
Construction and land development			—			—			2,624			2,624			20,573			23,197			—
Commercial real estate			—			—			675			675			59,605			60,280			—
Residential mortgages			—			—			667			667			222,827			223,494			—
Consumer			5			2			322			329			60,362			60,691			—

Total		$	5		$	2		$	4,288		$	4,295		$	387,707		$	392,002		$	—

Total loans:
Commercial non-real estate		$	8,955		$	3,305		$	11,011		$	23,271		$	4,602,044		$	4,625,315		$	1,968
Construction and land development			3,564			3,028			21,297			27,889			892,519			920,408			8,239
Commercial real estate			14,301			2,918			22,821			40,040			2,874,929			2,914,969			3,615
Residential mortgages			818			3,454			11,022			15,294			1,679,903			1,695,197			—
Consumer			5,372			2,398			5,041			12,811			1,565,772			1,578,583			1,798

Total		$	33,010		$	15,103		$	71,192		$	119,305		$	11,615,167		$	11,734,472		$	15,620




																				Recorded
								Greater than												investment
		30-59 days			60-89 days			90 days			Total						Total			> 90 days
December 31, 2012		past due			past due			past due			past due			Current			Loans			and accruing
											(In thousands)
Originated loans:
Commercial		$	24,398		$	16,508		$	46,355		$	87,261		$	4,840,199		$	4,927,460		$	5,262
Residential mortgages			11,500			3,303			4,100			18,903			809,082			827,985			—
Consumer			10,348			2,150			4,231			16,729			1,335,047			1,351,776			2,474

Total		$	46,246		$	21,961		$	54,686		$	122,893		$	6,984,328		$	7,107,221		$	7,736

Acquired loans:
Commercial		$	28,791		$	4,666		$	15,774		$	49,231		$	3,216,109		$	3,265,340		$	4,354
Residential mortgages			9,641			1,290			8,996			19,927			466,517			486,444			1,106
Consumer			1,282			430			2,170			3,882			199,092			202,974			47

Total		$	39,714		$	6,386		$	26,940		$	73,040		$	3,881,718		$	3,954,758		$	5,507

Covered loans:
Commercial		$	—		$	—		$	3,707		$	3,707		$	149,181		$	152,888		$	—
Residential mortgages			—			—			393			393			263,122			263,515			—
Consumer			—			—			—			—			99,420			99,420			—

Total		$	—		$	—		$	4,100		$	4,100		$	511,723		$	515,823		$	—

Total loans:
Commercial		$	53,189		$	21,174		$	65,836		$	140,199		$	8,205,489		$	8,345,688		$	9,616
Residential mortgages			21,141			4,593			13,489			39,223			1,538,721			1,577,944			1,106
Consumer			11,630			2,580			6,401			20,611			1,633,559			1,654,170			2,521

Total		$	85,960		$	28,347		$	85,726		$	200,033		$	11,377,769		$	11,577,802		$	13,243

The following tables present the credit quality indicators of the Company’s various classes of loans at September 30, 2013 and December 31, 2012.

Commercial Non-Real Estate Credit Exposure

Credit Risk Profile by Internally Assigned Grade




		September 30, 2013												December 31, 2012
		Originated			Acquired			Covered			Total			Originated			Acquired			Covered			Total
		(In thousands)												(In thousands)
Grade:
Pass		$	3,459,635		$	877,964		$	14,063		$	4,351,662		$	2,610,970		$	1,588,435		$	14,855		$	4,214,260
Pass-Watch			106,657			41,741			118			148,516			32,393			52,361			74			84,828
Special Mention			31,600			28,308			—			59,908			23,550			6,267			3,226			33,043
Substandard			35,598			18,547			7,820			61,965			46,472			43,219			8,433			98,124
Doubtful			—			925			2,339			3,264			—			361			2,672			3,033
Loss			—			—			—			—			—			—			—			—

Total		$	3,633,490		$	967,485		$	24,340		$	4,625,315		$	2,713,385		$	1,690,643		$	29,260		$	4,433,288

Construction Credit Exposure

Credit Risk Profile by Internally Assigned Grade




		30-Sep-13												31-Dec-12
		Originated			Acquired			Covered			Total			Originated			Acquired			Covered			Total
		(In thousands)												(In thousands)
Grade:
Pass		$	681,999		$	130,457		$	230		$	812,686		$	557,511		$	249,269		$	331		$	807,111
Pass-Watch			16,728			8,684			598			26,010			13,705			2,993			1,028			17,726
Special Mention			944			1,446			197			2,587			30,522			12,248			420			43,190
Substandard			39,312			17,637			10,241			67,190			63,925			30,637			7,311			101,873
Doubtful			—			4			11,931			11,935			10			4			19,392			19,406
Loss			—			—			—			—			—			—			—			—

Total		$	738,983		$	158,228		$	23,197		$	920,408		$	665,673		$	295,151		$	28,482		$	989,306

Commercial Real Estate Credit Exposure

Credit Risk Profile by Internally Assigned Grade




		30-Sep-13												31-Dec-12
		Originated			Acquired			Covered			Total			Originated			Acquired			Covered			Total
		(In thousands)												(In thousands)
Grade:
Pass		$	1,656,114		$	943,760		$	5,853		$	2,605,727		$	1,353,453		$	1,173,617		$	16,693		$	2,543,763
Pass-Watch			32,762			41,172			4,823			78,757			36,507			16,051			15,015			67,573
Special Mention			3,618			7,864			3,127			14,609			29,912			21,116			3,787			54,815
Substandard			123,890			45,491			32,989			202,370			128,088			68,762			31,298			228,148
Doubtful			18			—			13,488			13,506			442			—			28,353			28,795
Loss			—			—			—			—			—			—			—			—

Total		$	1,816,402		$	1,038,287		$	60,280		$	2,914,969		$	1,548,402		$	1,279,546		$	95,146		$	2,923,094

Residential Mortgage Credit Exposure

Credit Risk Profile Based on Payment Activity




		September 30, 2013												December 31, 2012
		Originated			Acquired			Covered			Total			Originated			Acquired			Covered			Total
		(In thousands)												(In thousands)
Performing		$	1,110,952		$	337,390		$	223,101		$	1,671,443		$	820,281		$	475,893		$	263,515		$	1,559,689
Nonperforming			13,697			9,664			393			23,754			7,704			10,551			—			18,255

Total		$	1,124,649		$	347,054		$	223,494		$	1,695,197		$	827,985		$	486,444		$	263,515		$	1,577,944

Consumer Credit Exposure

Credit Risk Profile Based on Payment Activity




		September 30, 2013												December 31, 2012
		Originated			Acquired			Covered			Total			Originated			Acquired			Covered			Total
		(In thousands)												(In thousands)
Performing		$	1,382,144		$	128,759		$	60,691		$	1,571,594		$	1,345,487		$	200,292		$	99,420		$	1,645,199
Nonperforming			5,099			1,890			—			6,989			6,289			2,682			—			8,971

Total		$	1,387,243		$	130,649		$	60,691		$	1,578,583		$	1,351,776		$	202,974		$	99,420		$	1,654,170

Loan review uses a risk-focused continuous monitoring program that provides for an independent, objective and timely review of credit risk within the company. Below are the definitions of the Company’s internally assigned grades:

Commercial:



	•		Pass—loans properly approved, documented, collateralized, and performing which do not reflect an abnormal credit risk.


	•		Pass—Watch—Credits in this category are of sufficient risk to cause concern. This category is reserved for credits that display negative performance trends. The “Watch” grade should be regarded as a transition category.


	•		Special Mention—These credits exhibit some signs of “Watch,” but to a greater magnitude. These credits constitute an undue and unwarranted credit risk, but not to a point of justifying a classification of “Substandard.” They have weaknesses that, if not checked or corrected, weaken the asset or inadequately protect the bank.


	•		Substandard—These credits constitute an unacceptable risk to the bank. They have recognized credit weaknesses that jeopardize the repayment of the debt. Repayment sources are marginal or unclear.


	•		Doubtful—A Doubtful credit has all of the weaknesses inherent in one classified “Substandard” with the added characteristic that weaknesses make collection in full highly questionable or improbable.
	•		Loss—Credits classified as Loss are considered uncollectable and are charged off promptly once so classified.
Residential Mortgage and Consumer:



	•		Performing – Loans on which payments of principal and interest are less than 90 days past due.


	•		Nonperforming – Loans on which payments of principal and interest are more than 90 days past due and on nonaccrual status.
Changes in the carrying amount of acquired-impaired loans and accretable yield are presented in the following table for the nine months ended September 30, 2013 and the year ended December 31, 2012:




		September 30, 2013												December 31, 2012
		Covered						Non-covered						Covered						Non-covered
		Carrying						Carrying						Carrying						Carrying
		Amount			Accretable			Amount			Accretable			Amount			Accretable			Amount			Accretable
		of Loans			Yield			of Loans			Yield			of Loans			Yield			of Loans			Yield
(In thousands)
Balance at beginning of period		$	515,823		$	115,594		$	141,201		$	203,186		$	671,443		$	153,137		$	339,452		$	130,691
Additions			—			—			—			—			—			—			—			—
Payments received, net			(150,405	)		(861	)		(106,444	)		(37,961	)		(200,719	)		—			(250,338	)		—
Accretion			26,584			(26,584	)		30,213			(30,213	)		45,099			(45,099	)		52,087			(52,087	)
Increase (decrease) in expected cash flows based on actual cash flow and changes in cash flow assumptions			—			(12,944	)		—			6,465			—			(19,326	)		—			23,688
Net transfers from (to) nonaccretable difference to accretable yield			—			22,611			—			5,636			—			26,882			—			100,894

Balance at end of period		$	392,002		$	97,816		$	64,970		$	147,113		$	515,823		$	115,594		$	141,201		$	203,186

Fair_Value

Fair Value	9 Months Ended
Fair Value	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value	'
	4. Fair Value

	The Financial Accounting Standards Board (FASB) defines fair value as the exchange price that would be received to sell 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 on the measurement date. The FASB’s guidance also established a fair value hierarchy that prioritizes the inputs to the valuation techniques used to measure fair value, giving preference to quoted prices in active markets for identical assets or liabilities (level 1) and the lowest priority to unobservable inputs such as a reporting entity’s own data (level 3). Level 2 inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in markets that are not active, observable inputs other than quoted prices, such as interest rates and yield curves, and inputs that are derived principally from or corroborated by observable market data by correlation or other means.



	Fair Value of Assets and Liabilities Measured on a Recurring Basis

	The following tables present for each of the fair value hierarchy levels the Company’s assets and liabilities that are measured at fair value (in thousands) on a recurring basis in the consolidated balance sheets.




			September 30, 2013
			Level 1			Level 2			Total
	Assets
	Available for sale debt securities:
	U.S. Treasury and government agency securities		$	620		$	—		$	620
	Municipal obligations			—			43,648			43,648
	Corporate debt securities			3,500			—			3,500
	Mortgage-backed securities			—			1,359,970			1,359,970
	Collateralized mortgage obligations			—			45,032			45,032
	Equity securities			5,350			—			5,350

	Total available-for-sale securities			9,470			1,448,650			1,458,120

	Derivative assets (1)			—			16,062			16,062

	Total recurring fair value measurements—assets		$	9,470		$	1,464,712		$	1,474,182

	Liabilities
	Derivative liabilities (1)		$	—		$	15,929		$	15,929

	Total recurring fair value measurements—liabilities		$	—		$	15,929		$	15,929



	-1	For further disaggregation of derivative assets and liabilities, see Note 5—Derivatives.



			December 31, 2012
			Level 1			Level 2			Total
	Assets
	Available for sale debt securities:
	U.S. Treasury and government agency securities		$	18,265		$	—		$	18,265
	Municipal obligations			—			50,165			50,165
	Corporate debt securities			2,250			—			2,250
	Mortgage-backed securities			—			1,774,406			1,774,406
	Collateralized mortgage obligations			—			198,077			198,077
	Equity securities			5,279			—			5,279

	Total available-for-sale securities			25,794			2,022,648			2,048,442

	Derivative assets (1)			—			20,093			20,093

	Total recurring fair value measurements—assets		$	25,794		$	2,042,741		$	2,068,535

	Liabilities
	Derivative liabilities (1)		$	—		$	21,100		$	21,100

	Total recurring fair value measurements—liabilities		$	—		$	21,100		$	21,100



-1	For further disaggregation of derivative assets and liabilities, see Note 5—Derivatives.


Securities classified as level 1 within the valuation hierarchy include U.S. Treasury securities, obligations of U.S. Government-sponsored agencies, and certain other debt and equity securities. Level 2 classified securities include residential mortgage-backed securities and collateralized mortgage obligations that are issued or guaranteed by U.S. government agencies, and state and municipal bonds. The level 2 fair value measurements for investment securities are obtained quarterly from a third-party pricing service that uses industry-standard pricing models. Substantially all of the model inputs are observable in the marketplace or can be supported by observable data. The Company invests only in high quality securities of investment grade quality with a targeted duration, for the overall portfolio, generally between two to five years. Company policies limit investments to securities having a rating of not less than “Baa” or its equivalent by a nationally recognized statistical rating agency. There were no transfers between valuation hierarchy levels during the periods shown.

The fair value of derivative financial instruments, which are predominantly interest rate swaps, is obtained from a third-party pricing service that uses an industry-standard discounted cash flow model that relies on inputs, such as LIBOR swap curves and Overnight Index Swap rate (OIS) curves, observable in the marketplace. To comply with the accounting guidance, credit valuation adjustments are incorporated in the fair values to appropriately reflect nonperformance risk for both the Company and the counterparties. Although the Company has determined that the majority of the inputs used to value the derivative instruments fall within level 2 of the fair value hierarchy, the credit value adjustments utilize level 3 inputs, such as estimates of current credit spreads. The Company has determined that the impact of the credit valuation adjustments is not significant to the overall valuation of these derivatives. As a result, the Company has classified its derivative valuations in their entirety in level 2 of the fair value hierarchy. The Company’s policy is to measure counterparty credit risk quarterly for all derivative instruments subject to master netting arrangements consistent with how market participants would price the net risk exposure at the measurement date.

The Company also has certain derivative instruments associated with the Banks’ mortgage-banking activities. These derivative instruments include interest rate lock commitments on prospective residential mortgage loans and forward commitments to sell these loans to investors on a best efforts delivery basis. The fair value of these derivative instruments is measured using observable market prices for similar instruments and classified as level 2 measurements.

Fair Value of Assets Measured on a Nonrecurring Basis

Certain assets and liabilities are measured at fair value on a nonrecurring basis. Collateral-dependent impaired loans are level 2 assets measured at the fair value of the underlying collateral based on third-party appraisals that take into consideration market-based information such as recent sales activity for similar assets in the property’s market.

Other real estate owned, including both foreclosed property and surplus banking property, are level 3 assets that are adjusted to fair value, less estimated selling costs, upon transfer to other real estate owned. Subsequently, other real estate owned is carried at the lower of carrying value or fair value less estimated selling costs. Fair values are determined by sales agreement or third-party appraisals as discounted for estimated selling costs, information from comparable sales, and marketability of the property.

The following tables present for each of the fair value hierarchy levels the Company’s financial assets that are measured at fair value (in thousands) on a nonrecurring basis.




		September 30, 2013
		Level 1			Level 2			Level 3			Total
Collateral-dependent impaired loans		$	—		$	27,981		$	—		$	27,981
Other real estate owned			—			—			21,148			21,148

Total nonrecurring fair value measurements		$	—		$	27,981		$	21,148		$	49,129


		31-Dec-12
		Level 1			Level 2			Level 3			Total
Collateral-dependent impaired loans		$	—		$	72,694		$	—		$	72,694
Other real estate owned			—			—			43,803			43,803

Total nonrecurring fair value measurements		$	—		$	72,694		$	43,803		$	116,497

Accounting guidance from the FASB requires the disclosure of estimated fair value information about certain on- and off-balance sheet financial instruments, including those financial instruments that are not measured and reported at fair value on a recurring basis. The significant methods and assumptions used by the Company to estimate the fair value of financial instruments are discussed below.

Cash, Short-Term Investments and Federal Funds Sold - For these short-term instruments, the carrying amount is a reasonable estimate of fair value.

Securities – The fair value measurement for securities available for sale was discussed earlier. The same measurement techniques were applied to the valuation of securities held to maturity.

Loans, Net - The fair value measurement for certain impaired loans was discussed earlier. For the remaining portfolio, fair values were generally determined by discounting scheduled cash flows by discount rates determined with reference to current market rates at which loans with similar terms would be made to borrowers of similar credit quality.

Accrued Interest Receivable and Accrued Interest Payable - The carrying amounts are a reasonable estimate of fair value.

Deposits - The accounting guidance requires that the fair value of deposits with no stated maturity, such as noninterest-bearing demand deposits, interest-bearing checking and savings accounts, be assigned fair values equal to amounts payable upon demand (carrying amounts). The fair value of fixed-maturity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities.

Securities Sold under Agreements to Repurchase and Federal Funds Purchased—For these short-term liabilities, the carrying amount is a reasonable estimate of fair value.

Long-Term Debt—The fair value is estimated by discounting the future contractual cash flows using current market rates at which debt with similar terms could be obtained.

Derivative Financial Instruments – The fair value measurement for derivative financial instruments was discussed earlier.

The following tables present the estimated fair values of the Company’s financial instruments by fair value hierarchy levels and the corresponding carrying amount at September 30, 2013 and December 31, 2012 (in thousands):




		September 30, 2013
											Total		Carrying
		Level 1			Level 2			Level 3			Fair Value		Amount
Financial assets:
Cash, interest-bearing bank deposits, and federal funds sold		$	888,005		$	—		$	—		$	888,005	$	888,005
Available for sale securities			9,470			1,448,650			—			1,458,120		1,458,120
Held to maturity securities			100,688			2,553,179			—			2,653,867		2,666,082
Loans, net			—			27,981			11,528,860			11,556,841		11,596,250
Loans held for sale			—			18,444			—			18,444		18,444
Accrued interest receivable			42,039			—			—			42,039		42,039
Derivative financial instruments			—			16,062			—			16,062		16,062
Financial liabilities:
Deposits		$	—		$	—		$	15,017,314		$	15,017,314	$	15,054,871
Federal funds purchased			22,193			—			—			22,193		22,193
Securities sold under agreements to repurchase			760,586			—			—			760,586		760,586
Long-term debt			—			384,239			—			384,239		376,664
Accrued interest payable			5,694			—			—			5,694		5,694
Derivative financial instruments			—			15,929			—			15,929		15,929

		December 31, 2012
											Total		Carrying
		Level 1			Level 2			Level 3			Fair Value		Amount
Financial assets:
Cash, interest-bearing bank deposits, and federal funds sold		$	1,948,679		$	—		$	—		$	1,948,679	$	1,948,679
Available for sale securities			25,794			2,022,648			—			2,048,442		2,048,442
Held to maturity securities			—			1,710,465			—			1,710,465		1,668,018
Loans, net			—			72,694			11,494,409			11,567,103		11,441,631
Loans held for sale			—			50,605			—			50,605		50,605
Accrued interest receivable			45,616			—			—			45,616		45,616
Derivative financial instruments			—			20,093			—			20,093		20,093
Financial liabilities:
Deposits		$	—		$	—		$	15,757,044		$	15,757,044	$	15,744,188
Federal funds purchased			25,704			—			—			25,704		25,704
Securities sold under agreements to repurchase			613,429			—			—			613,429		613,429
Long-term debt			—			410,791			—			410,791		396,589
Accrued interest payable			4,814			—			—			4,814		4,814
Derivative financial instruments			—			21,100			—			21,100		21,100

Derivatives

Derivatives	9 Months Ended
Derivatives	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivatives	'
	5. Derivatives

	Risk Management Objective of Using Derivatives

	The Company enters into derivative financial instruments to manage risks related to differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments, currently related to our variable rate borrowing. The Banks have also entered into interest rate derivative agreements as a service to certain qualifying customers. The Banks manage a matched book with respect to these customer derivatives in order to minimize the net risk exposure resulting from such agreements. The Banks also enter into risk participation agreements under which they may either sell or buy credit risk associated with a customer’s performance under certain interest rate derivative contracts related to loans in which participation interests have been sold to or purchased from other banks.

	Fair Values of Derivative Instruments on the Balance Sheet

	The table below presents the notional amounts and fair values (in thousands) of the Company’s derivative financial instruments as well as their classification on the consolidated balance sheets as of September 30, 2013 and December 31, 2012.

	Fair and Notional Values of Derivative Instruments




										Fair Values (1)
				Notional Amounts						Assets						Liabilities
	(in thousands)		Type of	September 30,			December 31,			September 30,			December 31,			September 30,			December 31,
	(in thousands)		Hedge	2013			2012			2013			2012			2013			2012
	Derivatives designated as hedging instruments:
	Interest rate swaps		Cash Flow	$	—		$	140,000		$	—		$	—		$	—		$	298

				$	—		$	140,000		$	—		$	—		$	—		$	298

	Derivatives not designated as hedging instruments:
	Interest rate swaps (2)		N/A	$	661,421		$	547,477		$	15,249		$	19,448		$	15,079		$	20,157
	Risk participation agreements		N/A		20,287			—			4			—			3			—
	Forward commitments to sell residential mortgage loans		N/A		24,473			115,256			51			190			355			590
	Interest rate-lock commitments on residential mortgage loans		N/A		12,814			58,135			251			455			11			55
	Foreign exchange forward contracts		N/A		33,941			—			507			—			481			—

				$	752,936		$	720,868		$	16,062		$	20,093		$	15,929		$	20,802



	-1	Derivative assets and liabilities are reported with other assets or other liabilities, respectively, in the consolidated balance sheets.
	-2	The notional amount represents both the customer accommodation agreements and offsetting agreements with unrelated financial institutions.
	Cash Flow Hedges of Interest Rate Risk

	The Company had been party to an interest rate swap agreement with a notional amount of $140 million under which the Company received interest at a variable rate and paid at a fixed rate. This derivative instrument represented by this swap agreement was designated as and qualified as a cash flow hedge of the Company’s forecasted variable cash flows under a variable-rate term borrowing agreement. The swap agreement expired in June 2013.

	During the term of the swap agreement, the effective portion of changes in the fair value of the derivative instrument was recorded in accumulated other comprehensive income (“AOCI”) and subsequently reclassified into earnings in the periods that the hedged forecasted variable-rate interest payments affected earnings. The impact on AOCI was insignificant during 2013 and 2012. There was no ineffective portion of the change in fair value of the derivative recognized directly in earnings.

	Derivatives Not Designated as Hedges

	Customer interest rate derivatives

	The Banks enter into interest rate derivative agreements, primarily rate swaps, with commercial banking customers to facilitate their risk management strategies. The Banks simultaneously enter into offsetting agreements with unrelated financial institutions, thereby mitigating its net risk exposure resulting from such transactions. Because the interest rate derivatives associated with this program do not meet hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings.

	Risk participation agreements

	The Banks also enter into risk participation agreements under which they may either assume or sell credit risk associated with a borrower’s performance under certain interest rate derivative contracts. In those instances where the Banks have assumed credit risk, they are not a direct counterparty to the derivative contract with the borrower and have entered into the risk participation agreement because they are a party to the related loan agreement with the borrower. In those instances in which the Banks have sold credit risk, they are the sole counterparty to the derivative contract with the borrower and have entered into the risk participation agreement because other banks participate in the related loan agreement. The Banks manage their credit risk under risk participation agreements by monitoring the creditworthiness of the borrower, based on their normal credit review process.

	Mortgage banking derivatives

	The Banks also enter into certain derivative agreements as part of their mortgage banking activities. These agreements include interest rate lock commitments on prospective residential mortgage loans and forward commitments to sell these loans to investors on a best efforts delivery basis.

	Customer foreign exchange forward contract derivatives

	The Banks enter into foreign exchange forward derivative agreements, primarily forward currency contracts, with commercial banking customers to facilitate their risk management strategies. The Banks manage its risk exposure from such transactions by entering into offsetting agreements with unrelated financial institutions. Because the foreign exchange forward contract derivatives associated with this program do not meet hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings.

	Effect of Derivative Instruments on the Income Statement

The effect of the Company’s derivative financial instruments on the income statement was immaterial for the three month and nine month periods ended September 30, 2013 and 2012.

Credit-risk-related Contingent Features

Certain of the Banks’ derivative instruments contain provisions allowing the financial institution counterparty to terminate the contracts in certain circumstances, such as the downgrade of the Banks’ credit ratings below specified levels, a default by the Bank on its indebtedness, or the failure of a Bank to maintain specified minimum regulatory capital ratios or its regulatory status as a well-capitalized institution. These derivative agreements also contain provisions regarding the posting of collateral by each party. As of September 30, 2013, the aggregate fair value of derivative instruments with credit-risk-related contingent features that were in a net liability position was $10.1 million, for which the Banks had posted collateral of $11.1 million.

Offsetting Assets and Liabilities

Offsetting information in regards to derivative assets and liabilities subject to master netting agreements at September 30, 2013 and December 31, 2012 is presented in the following tables (in thousands):




		Gross			Gross			Net Amounts			Gross Amounts Not Offset in the
					Amounts			Presented in			Statement of Financial Position
					Offset in the
								the Statement
					Statement
Description		Amounts			of Financial			of Financial			Financial			Cash			Net
Description		Recognized			Position			Position			Instruments			Collateral			Amount
As of September 30, 2013
Derivative Assets		$	15,253		$	—		$	15,253		$	1,949		$	—		$	13,304

Total		$	15,253		$	—		$	15,253		$	1,949		$	—		$	13,304

Derivative Liabilities		$	15,082		$	—		$	15,082		$	1,949		$	9,113		$	4,020

Total		$	15,082		$	—		$	15,082		$	1,949		$	9,113		$	4,020

As of December 31, 2012
Derivative Assets		$	19,448		$	—		$	19,448		$	—		$	—		$	19,448

Total		$	19,448		$	—		$	19,448		$	—		$	—		$	19,448

Derivative Liabilities		$	20,455		$	—		$	20,455		$	—		$	16,839		$	3,616

Total		$	20,455		$	—		$	20,455		$	—		$	16,839		$	3,616

Stockholders_Equity

Stockholders' Equity	9 Months Ended
Stockholders' Equity	Sep. 30, 2013
Equity [Abstract]	'
Stockholders' Equity	'
	6. Stockholders’ Equity

	Stock Repurchase Program

	The Company’s board of directors approved a stock repurchase program on April 30, 2013 that authorizes the repurchase of up to 5% of the Company’s outstanding common stock.

	On May 8, 2013 Hancock entered into an accelerated share repurchase (ASR) transaction with Morgan Stanley & Co. LLC (Morgan Stanley). In the ASR transaction, the Company paid $115 million to Morgan Stanley and received from them approximately 2.8 million shares of Hancock common stock, representing approximately 76% of the estimated total number of shares to be repurchased. The actual number of shares to be delivered to the Company in this ASR transaction will be based generally on the volume-weighted average price per share of the Hancock common stock during the term of the ASR agreement less a specified discount and on the amount paid at inception to Morgan Stanley, subject to certain possible adjustments in accordance with the terms of the ASR agreement. Final settlement of the ASR agreement is scheduled to occur no earlier than November, 2013 and no later than May, 2014. The ASR transaction was treated as two separate transactions: (i) the acquisition of treasury shares on the date the shares were received; and (ii) a forward contract indexed to the Company’s common stock that is classified as equity.

	Accumulated Other Comprehensive Income (Loss)

	Accumulated other comprehensive income (loss) (AOCI) is reported as a component of stockholders’ equity. AOCI can include, among other items, unrealized holding gains and losses on securities available for sale (AFS), gains and losses associated with pension or other post retirement benefits that are not recognized immediately as a component of net periodic benefit cost, and gains and losses on derivative instruments that are designated as, and qualify as, cash flow hedges. The net unrealized gain on AFS securities reclassified as securities held to maturity (HTM) during 2012 and the net unrealized loss on AFS securities reclassified as securities held to maturity (HTM) during 2013 continue to be reported as a component of AOCI and will be amortized or accreted over the estimated remaining life of the securities as an adjustment to interest income. The components of AOCI are reported net of related tax effects. The components of AOCI and changes in those components are presented in the following table (in thousands).


			Available				HTM							Loss on
			Available				Securities							Loss on
			for Sale				Transferred				Employee			Effective Cash
			Securities				from AFS				Benefit Plans			Flow Hedges			Total
	Balance, January 1, 2012		$	60,478			$	—			$	(86,923	)	$	(65	)	$	(26,510	)

	Other comprehensive income before income taxes:
	Net change in unrealized gain (loss)			24,780				—				—			(370	)		24,410
	Transfer of net unrealized gain from AFS to HTM, net of cumulative tax effect			(24,598	)			24,598				—			—			—
	Reclassification of net (gains) losses realized and included in earnings			(929	)			—				5,260			40			4,371
	Amortization of unrealized net gain on securities transferred to HTM			—				(5,645	)			—			—			(5,645	)
	Income tax expense (benefit)			8,693				(2,122	)			1,971			(129	)		8,413

	Balance, September 30, 2012		$	51,038			$	21,075			$	(83,634	)	$	(266	)	$	(11,787	)

	Balance, January 1, 2013		$	38,854			$	19,090			$	(80,688	)	$	(181	)	$	(22,925	)

	Other comprehensive income before income taxes:
	Net change in unrealized gain (loss)			(96,070	)			—				—			(4	)		(96,074	)
	Transfer of net unrealized loss from AFS to HTM, net of cumulative tax effect			36,208				(36,208	)			—			—			—
	Reclassification of net (gains) losses realized and included in earnings			—				—				5,534			301			5,835
	Amortization/accretion of unrealized net gain/loss on securities transferred to HTM			—				(7,099	)			—			—			(7,099	)
	Income tax expense (benefit)			(35,115	)			(2,563	)			2,070			116			(35,492	)

	Balance, September 30, 2013		$	14,107			$	(21,654	)		$	(77,224	)	$	—		$	(84,771	)

	The following table shows the line items in the consolidated income statements affected by amounts reclassified from accumulated other comprehensive income:




			Nine Months Ended								Increase (decrease) in affected
			September 30,								Increase (decrease) in affected
	Amount reclassified from AOCI (in thousands)		2013				2012				line item in the income statement
	Gains and losses on sale of AFS securities		$	—			$	929			Securities gains (losses)
	Tax effect			—				325			Income taxes

	Net of tax			—				604			Net income

	Amortization/accretion of unrealized net gain/loss on securities transferred to HTM		$	7,099			$	5,645			Interest income
	Tax effect			2,563				2,122			Income taxes

	Net of tax			4,536				3,523			Net income

	Amortization of defined benefit pension and post-retirement items		$	(5,534	)		$	(5,260	)		(a)
	Tax effect			(2,070	)			(1,971	)		Income taxes

	Net of tax			(3,464	)			(3,289	)		Net income

	Gains and losses on cash flow hedges		$	(301	)		$	(40	)		Interest expense
Tax effect			(105	)			(14	)		Income taxes

Net of tax			(196	)			(26	)		Net income

Total reclassifications, net of tax		$	876			$	812			Net income



(a)	These accumulated other comprehensive income components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see footnote 9 for additional details).

Earnings_Per_Share

Earnings Per Share	9 Months Ended
Earnings Per Share	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	7. Earnings Per Share

	Hancock calculates earnings per share using the two-class method. The two-class method allocates net income to each class of common stock and participating security according to common dividends declared and participation rights in undistributed earnings. Participating securities consist of unvested stock-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents.

	Following is a summary of the information used in the computation of earnings per common share using the two-class method (in thousands, except per share amounts):




		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Numerator:
	Net income to common shareholders	$	33,202	$	46,984	$	128,640	$	104,783
	Net income allocated to participating securities — basic and diluted		616		281		2,398		844

	Net income allocated to common shareholders—basic and diluted	$	32,586	$	46,703	$	126,242	$	103,939

	Denominator:
	Weighted-average common shares—basic		82,091		84,777		83,404		84,757
	Dilutive potential common shares		114		855		92		768

	Weighted average common shares—diluted		82,205		85,632		83,496		85,525

	Earnings per common share:
	Basic	$	0.4	$	0.55	$	1.51	$	1.23
	Diluted	$	0.4	$	0.55	$	1.51	$	1.22

	Potential common shares consist of employee and director stock options. These potential common shares do not enter into the calculation of diluted earnings per share if the impact would be anti-dilutive, i.e., increase earnings per share or reduce a loss per share. Weighted-average anti-dilutive potential common shares totaled 721,863 and 1,076,894 respectively for the three and nine months ended September 30, 2013 and 1,149,491 and 908,409 respectively for the three and nine months ended September 30, 2012.

ShareBased_Payment_Arrangement

Share-Based Payment Arrangements	9 Months Ended
Share-Based Payment Arrangements	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Share-Based Payment Arrangements	'
	8. Share-Based Payment Arrangements
	Hancock maintains incentive compensation plans that provide for awards of share-based compensation to employees and directors. These plans have been approved by the Company’s shareholders. Detailed descriptions of these plans were included in Note 13 to the consolidated financial statements in the Company’s annual report on Form 10-K for the year ended December 31, 2012.
	A summary of option activity for the nine months ended September 30, 2013 is presented below:


							Weighted-
							Average
					Weighted-		Remaining
					Average		Contractual		Aggregate
		Number of			Exercise		Term		Intrinsic
	Options	Shares			Price ($)		(Years)		Value ($000)
	Outstanding at January 1, 2013		1,555,296		$	38.57
	Exercised		(21,145	)		27.51
	Forfeited or expired		(96,226	)		45.15

	Outstanding at September 30, 2013		1,437,925		$	38.3		4.7	$	797

	Exercisable at September 30, 2013		990,202		$	41.15		3.4	$	389

	The total intrinsic value of options exercised during the nine months ended September 30, 2013 and 2012 was $0.1 million and $0.5 million, respectively.
	A summary of the status of the Company’s nonvested restricted and performance shares as of September 30, 2013 and changes during the nine months ended September 30, 2013, is presented below. These restricted and performance shares are subject to service requirements.


					Weighted-
					Average
		Number of			Grant-Date
		Shares			Fair Value ($)
	Nonvested at January 1, 2013		1,684,360		$	31.56
	Granted		95,586			32.03
	Vested		(38,909	)		34.52
	Forfeited		(70,884	)		31.25

	Nonvested at September 30, 2013		1,670,153		$	31.52


	As of September 30, 2013, there was $29.4 million of total unrecognized compensation expense related to nonvested restricted and performance shares expected to vest. This compensation is expected to be recognized in expense over a weighted-average period of 3.1 years. The total fair value of shares which vested during the nine months ended September 30, 2013 and 2012 was $1.2 million and $0.9 million, respectively.
	During the nine months ended September 30, 2013, the Company granted 67,533 performance shares with an average fair value of $32.84 per share to key members of executive and senior management. The number of 2013 performance shares that ultimately vest at the end of the three-year required service period will be based on the relative rank of Hancock’s three-year total shareholder return (TSR) among the TSRs of a peer group of fifty regional banks. The maximum number of performance shares that could vest is 200% of the target award. The fair value of the performance awards at the grant date was determined using a Monte Carlo simulation method. Compensation expense for these performance shares will be recognized on a straight-line basis over the service period.

Retirement_Plans

Retirement Plans	9 Months Ended
Retirement Plans	Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'
Retirement Plans	'
	9. Retirement Plans
	Effective January 1, 2013, the Company adopted one qualified defined benefit pension plan covering all eligible employees. Eligibility is based on minimum age and service-related requirements as well as job classification. The consolidated plan replaced the separate qualified plans covering legacy Hancock employees (Hancock Plan) and legacy Whitney employees (Whitney Plan). The new qualified plan terms are substantially the same for legacy Hancock employees as those in effect at December 31, 2012 under the Hancock Plan. Retirement benefits for eligible legacy Whitney employees under the new plan will be based on the employee’s accrued benefit under the Whitney Plan as of December 31, 2012 plus any benefit accrued under the new plan based on years of service and compensation beginning in 2013. The Whitney Plan had been closed to new participants since 2008, and benefit accruals had been frozen for all participants other than those meeting certain vesting, age and years of service criteria as of December 31, 2008. Accrued benefits under the nonqualified plan covering certain legacy Whitney employees were frozen as of December 31, 2012 and no future benefits will be accrued under this plan.
	The Company also sponsors defined benefit postretirement plans for both legacy Hancock and legacy Whitney employees that provide health care and life insurance benefits. Benefits under the Hancock plan are not available to employees hired on or after January 1, 2000. Benefits under the Whitney plan are restricted to retirees who were already receiving benefits at the time of plan amendments in 2007 or active participants who were eligible to receive benefits as of December 31, 2007.

	The following table shows the components of net periodic benefits cost included in expense for the plans.


		Three Months ended September 30,
		2013			2012			2013		2012
								Other Post-
		Pension benefits						retirement Benefits
	Service cost	$	3,969		$	3,249		$	52	$	48
	Interest cost		4,151			4,301			327		361
	Expected return on plan assets		(6,982	)		(6,350	)		—		—
	Amortization of prior service cost		—			—			—		(13	)
	Amortization of net loss		1,605			1,645			459		176
	Amortization of transition obligation		—			—			—		1

	Net periodic benefit cost	$	2,743		$	2,845		$	838	$	573



		Nine Months Ended September 30,
		2013			2012			2013		2012
		Pension benefits						Other Post-
		Pension benefits						retirement Benefits
	Service cost	$	11,905		$	9,743		$	162	$	144
	Interest cost		12,457			12,904			987		1,083
	Expected return on plan assets		(20,946	)		(19,049	)		—		—
	Amortization of prior service cost		—			—			—		(41	)
	Amortization of net loss		4,813			4,936			1,320		530
	Amortization of transition obligation		—			—			—		4

	Net periodic benefit cost	$	8,229		$	8,534		$	2,469	$	1,720

	The Company anticipates a total contribution to the pension plan of $10 million for 2013.
	Effective January 1, 2013, the Company also combined the Hancock and Whitney defined contribution retirement benefit plans (401(k) plans). Under the combined plan, the Company matches 100% of the first 1% of compensation saved by a participant, and 50% of the next 5% of compensation saved. Under the prior Hancock 401(k) plan, the Company matched 50% of a participant’s savings up to 6% of compensation, while under the prior Whitney 401(k) plan, the Company matched 100% of a participant’s savings up to 4% of compensation. The Company could also make a discretionary profit sharing contribution under the Whitney plan on behalf of participants who were either ineligible to participate in the Whitney qualified defined-benefit pension plan or subject to the freeze in benefit accruals under that plan. With the adoption of the new qualified pension plan discussed above and the combined 401(k) plan, the discretionary profit-sharing contribution is no longer available for plan years beginning in 2013.

Other_Noninterest_Income

Other Noninterest Income	9 Months Ended
Other Noninterest Income	Sep. 30, 2013
Other Income And Expenses [Abstract]	'
Other Noninterest Income	'
	10. Other Noninterest Income

	Components of other noninterest income are as follows:




		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
		(In thousands)
	Income from bank owned life insurance	$	2,574	$	2,870	$	8,764	$	8,617
	Credit related fees		2,995		1,545		5,969		5,130
	Income from derivatives		1,257		455		3,296		2,091
	Safety deposit box income		467		502		1,480		1,524
	Gain/(loss) on sale of assets		801		2,705		1,277		2,909
	Other miscellaneous		1,432		1,693		5,863		10,830

	Total other noninterest income	$	9,526	$	9,770	$	26,649	$	31,101

Other_Noninterest_Expense

Other Noninterest Expense	9 Months Ended
Other Noninterest Expense	Sep. 30, 2013
Other Income And Expenses [Abstract]	'
Other Noninterest Expense	'
	11. Other Noninterest Expense

	Components of other noninterest expense are as follows:




		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
		(In thousands)
	Insurance expense	$	887	$	1,207	$	3,018	$	4,428
	Ad valorem and franchise taxes		2,809		2,185		7,193		6,608
	Printing and supplies		1,143		1,488		3,963		6,162
	Public relations and contributions		969		1,065		3,960		4,827
	Travel expense		1,074		1,282		3,475		4,464
	Other real estate owned expense, net		2,439		4,590		6,502		11,630
	Tax credit investment amortization		4,880		1,513		7,553		4,538
	Other miscellaneous		19,851		4,488		32,504		19,311

	Total other noninterest expense	$	34,052	$	17,818	$	68,168	$	61,968

	Other miscellaneous expenses include one-time expenses related to branch closings in 2013 and merger-related expenses and costs associated with the early redemption of a portion of Whitney Bank’s subordinated debt in 2012.

Segment_Reporting

Segment Reporting	9 Months Ended
Segment Reporting	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment Reporting	'
	12. Segment Reporting

	The Company’s reportable operating segments consist of the Hancock segment, which coincides generally with the Company’s Hancock Bank subsidiary, and the Whitney segment, which coincides generally with its Whitney Bank subsidiary. Each of the bank segments offers commercial, consumer and mortgage loans and deposit services as well as certain other services, such as trust and treasury management services. Although the bank segments offer the same products and services, they are managed separately due to different pricing, product demand, and consumer markets. In addition, the “Other” column in the following tables includes activities of other consolidated subsidiaries which do not constitute reportable segments under the quantitative and aggregation accounting guidelines. These subsidiaries provide investment services, insurance agency services, and various other services to third parties.




			Three Months Ended September 30, 2013
			Hancock				Whitney				Other				Eliminations				Consolidated
	Interest income		$	66,509			$	109,909			$	6,336			$	(1,115	)		$	181,639
	Interest expense			(4,318	)			(4,583	)			(2,208	)			1,000			$	(10,109	)

	Net interest income			62,191				105,326				4,128				(115	)			171,530

	Provision for loan losses			(7,479	)			899				(989	)			—				(7,569	)
	Noninterest income			18,527				34,366				10,174				(10	)			63,057
	Depreciation and amortization			(3,983	)			(3,868	)			(306	)			—				(8,157	)
	Other noninterest expense			(65,756	)			(96,334	)			(11,968	)			10				(174,048	)

	Income before income taxes			3,500				40,389				1,039				(115	)			44,813
	Income tax expense			338				10,619				654				—				11,611

	Net income		$	3,162			$	29,770			$	385			$	(115	)		$	33,202

	Goodwill		$	94,130			$	527,063			$	4,482			$	—			$	625,675
	Total assets		$	6,513,536			$	12,620,550			$	2,747,834			$	(3,080,074	)		$	18,801,846

	Total interest income from affiliates		$	807			$	308			$	—			$	(1,115	)		$	—
	Total interest income from external customers		$	65,702			$	109,601			$	6,336			$	—			$	181,639



			Three Months Ended September 30, 2012
			Hancock				Whitney				Other				Eliminations				Consolidated
	Interest income		$	73,558			$	110,917			$	6,068			$	(1,338	)		$	189,205
	Interest expense			(5,402	)			(5,669	)			(2,100	)			1,222			$	(11,949	)

	Net interest income			68,156				105,248				3,968				(116	)			177,256

	Provision for loan losses			(4,814	)			(2,353	)			(934	)			—				(8,101	)
	Noninterest income			20,205				31,938				10,722				(23	)			62,842
	Depreciation and amortization			(3,830	)			(3,981	)			(256	)			—				(8,067	)
	Other noninterest expense			(59,821	)			(90,087	)			(11,761	)			22				(161,647	)

	Securities transactions			94				823				—				—				917

	Income before income taxes			19,990				41,588				1,739				(117	)			63,200
	Income tax expense			5,433				10,130				653				—				16,216

	Net income		$	14,556			$	31,458			$	1,086			$	(117	)		$	46,984

	Goodwill		$	94,130			$	530,265			$	4,482			$	—			$	628,877
	Total assets		$	6,390,378			$	12,343,043			$	2,737,061			$	(2,946,352	)		$	18,524,130

	Total interest income from affiliates		$	1,010			$	328			$	—			$	(1,338	)		$	—
	Total interest income from external customers		$	72,548			$	110,589			$	6,068			$	—			$	189,205



			Nine Months Ended September 30, 2013
			Hancock				Whitney				Other				Eliminations				Consolidated
	Interest income		$	198,115			$	333,322			$	18,612			$	(3,489	)		$	546,560
	Interest expense			(13,753	)			(14,162	)			(7,065	)			3,144				(31,836	)

Net interest income			184,362				319,160				11,547				(345	)			514,724

Provision for loan losses			(15,986	)			(6,016	)			(3,402	)			—				(25,404	)
Noninterest income			56,804				97,278				33,093				(34	)			187,141
Depreciation and amortization			(11,572	)			(11,698	)			(908	)			—				(24,178	)
Other noninterest expense			(173,037	)			(269,735	)			(37,141	)			34				(479,879	)

Income before income taxes			40,571				128,989				3,189				(345	)			172,404
Income tax expense			7,521				34,133				2,110				—				43,764

Net income		$	33,050			$	94,856			$	1,079			$	(345	)		$	128,640

Goodwill		$	94,130			$	527,063			$	4,482			$	—			$	625,675
Total assets		$	6,513,536			$	12,620,550			$	2,747,834			$	(3,080,074	)		$	18,801,846

Total interest income from affiliates		$	2,741			$	748			$	—			$	(3,489	)		$	—
Total interest income from external customers		$	195,374			$	332,574			$	18,612			$	—			$	546,560

		Nine Months Ended September 30, 2012
		Hancock				Whitney				Other				Eliminations				Consolidated
Interest income		$	201,525			$	355,776			$	17,839			$	(3,730	)		$	571,410
Interest expense			(17,587	)			(19,915	)			(6,290	)			3,385				(40,407	)

Net interest income			183,938				335,861				11,549				(345	)			531,003

Provision for loan losses			(7,313	)			(18,696	)			(132	)			—				(26,141	)
Noninterest income			59,644				98,122				30,149				(27	)			187,888
Depreciation and amortization			(10,884	)			(13,596	)			(749	)			—				(25,229	)
Other noninterest expense			(174,796	)			(320,985	)			(34,166	)			27				(529,920	)
Securities transactions			98				824				7				—				929

Income before income taxes			50,687				81,530				6,658				(345	)			138,530
Income tax expense			11,808				18,938				3,001				—				33,747

Net income		$	38,879			$	62,592			$	3,657			$	(345	)		$	104,783

Goodwill		$	94,130			$	530,265			$	4,482			$	—			$	628,877
Total assets		$	6,390,378			$	12,343,043			$	2,737,061			$	(2,946,352	)		$	18,524,130

Total interest income from affiliates		$	3,033			$	697			$	—			$	(3,730	)		$	—
Total interest income from external customers		$	198,492			$	355,079			$	17,839			$	—			$	571,410

New_Accounting_Pronouncements

New Accounting Pronouncements	9 Months Ended
New Accounting Pronouncements	Sep. 30, 2013
Accounting Changes And Error Corrections [Abstract]	'
New Accounting Pronouncements	'
	13. New Accounting Pronouncements

	In July 2013, the Financial Accounting Standards Board (FASB) issued an Accounting Standards Update (ASU) that applies to companies that have unrecognized tax benefits when net operating loss (NOL) or similar tax loss carryforwards or tax credit carryforwards exist at the reporting date. Under the updated guidance, an entity should present its unrecognized tax benefits net against the deferred tax assets for all same jurisdiction NOL or similar tax loss carryforwards, or tax credit carryforwards that are available to and would be used by the entity to settle additional income taxes resulting from disallowance of the uncertain tax position. The ASU is effective for interim and annual reporting periods beginning after December 15, 2013. The adoption of this guidance is not expected to have a material impact on the Company’s financial condition or results of operations.

	In July 2013, the FASB issued an ASU to allow entities to use the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a U.S. benchmark interest rate for hedge accounting purposes. Previously, only the interest rates on direct Treasury obligations of the United States and the London Interbank Offered Rate swap rate were considered benchmark rates. The amendment also removed the restriction requiring entities to use the same benchmark rate for similar hedges. This ASU is effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The adoption of this guidance did not have a material impact on the Company’s financial condition or results of operations.

	In February 2013, the FASB issued an ASU to improve the reporting of amounts reclassified out of accumulated other comprehensive income. The updated guidance requires an entity to present, either on the face of the statement where net income is presented or in the notes, the effects on the line items of net income of significant amounts reclassified out of accumulated other comprehensive income, but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income, an entity must cross-reference to other required disclosures that provide additional details about those amounts. This ASU is effective for interim and annual reporting periods beginning after December 15, 2012. Because this updated guidance impacts only disclosures in financial statements and does not change the current requirements for reporting net income or other comprehensive income in financial statements, its implementation did not impact the Company’s financial condition or results of operations.

	In October 2012, the FASB issued an ASU for entities that recognize an indemnification asset as a result of a government-assisted acquisition of a financial institution. When there is a change in the cash flows expected to be collected on the indemnification asset as a result of a change in cash flows expected to be collected on the assets subject to indemnification, the reporting entity should subsequently account for the change in the measurement of the indemnification asset on the same basis as the change in the assets subject to indemnification. Any amortization of changes in value should be limited to the contractual term of the indemnification agreement (that is, the lesser of the term of the indemnification agreement and the remaining life of the indemnified assets). The amendments in this update are effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2012. The updated guidance is applied prospectively to any new indemnification assets acquired after the date of adoption and to indemnification assets existing as of the date of adoption arising from a government-assisted acquisition of a financial institution. The Company’s current accounting policy complies with the guidance in this update.



	In July 2012, FASB issued an ASU that specifies that an entity has the option first to assess qualitative factors to determine whether the existence of events and circumstances indicates that it is more likely than not that the indefinite-lived intangible asset is impaired. If, after assessing the totality of events and circumstances, an entity concludes that it is not more likely than not that the indefinite-lived intangible asset is impaired, then the entity is not required to take further action. However, if an entity concludes otherwise, then it is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment test by comparing the fair value with the carrying amount. Under the guidance in this ASU, an entity also has the option to bypass the qualitative assessment for any indefinite-lived intangible asset in any period and proceed directly to performing the quantitative impairment test. An entity will be able to resume performing the qualitative assessment in any subsequent period. The guidance in this ASU was effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012, with early adoption permitted. The adoption of this guidance did not have a material impact on the Company’s financial condition or results of operations.

	In December 2011, the FASB issued an ASU to address the differences between international financial reporting standards (IFRS) and U.S. GAAP regarding the offsetting of assets and liabilities. Instead of proposing new criteria for netting assets and liabilities the FASB and International Accounting Standards Board (IASB) jointly issued common disclosure requirements related to offsetting arrangements that call for the disclosure of both net and gross information for these assets and liabilities, irrespective of whether they are offset on the statement of financial position. In January 2013, the FASB clarified that these disclosure requirements apply only to derivatives, repurchase and reverse repurchase agreements, and securities borrowing and lending transactions that are either offset in accordance with existing accounting guidance or subject to a master netting arrangement or similar agreement. An entity is required to provide the new disclosures for annual and interim reporting periods beginning on or after January 1, 2013. This guidance impacts only the disclosures in financial statements and did not impact the Company’s financial condition or results of operations.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	The consolidated financial statements include the accounts of Hancock Holding Company and all other entities in which it has a controlling interest (the “Company”). The financial statements include all adjustments that are, in the opinion of management, necessary to present fairly the Company’s financial condition, results of operations, changes in stockholders’ equity and cash flows for the interim periods presented. Some financial information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the U.S. (U.S. GAAP) have been condensed or omitted in this Form 10-Q pursuant to Securities and Exchange Commission rules and regulations. These financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s 2012 Annual Report on Form 10-K. Financial information reported in these financial statements is not necessarily indicative of the Company’s financial condition, results of operations, or cash flows for any other interim or annual period.
Use of Estimates	'
	Use of Estimates
	The accounting principles the Company follows and the methods for applying these principles conform with U.S. GAAP and with those generally practiced within the banking industry. These accounting principles require management to make estimates and assumptions about future events that affect the amounts reported in the consolidated financial statements and the accompanying notes.
Critical Accounting Policies and Estimates	'
	Critical Accounting Policies and Estimates

	Allowance for Loan Losses

	The allowance for loan and lease losses (ALLL) is a valuation account available to absorb losses on loans. The ALLL is maintained at an amount sufficient to cover the estimated credit losses associated with the loan and lease portfolios of the Company as of the date of the determination. Credit losses arise not only from credit risk, but also from other risks inherent in the lending process including, but not limited to, collateral risk, operational risk, concentration risk, and economic risk. As such, all related risks of lending are considered when assessing the adequacy of the allowance for loan and lease losses. Quarterly, management estimates the inherent losses in the existing loan portfolio based on a number of factors, including the Company’s past loan loss and delinquency experience, known and inherent risks in the portfolio, adverse situations that may affect the borrowers’ ability to repay, the estimated value of any underlying collateral and current economic conditions.

	The analysis and methodology for estimating the ALLL include two primary elements. A loss rate analysis which incorporates a historical loss rate as updated for current conditions is used for loans collectively evaluated for impairment, and a specific reserve analysis is used for loans individually evaluated for impairment.

	During the second quarter of 2013, management revised the methodology for the loss-rate analysis for the originated and acquired-performing loan portfolios due to the increased size and complexity of the Company’s commercial loan portfolio. The primary changes in the methodology were to segment loans with similar risk characteristics at a more granular level and to lengthen the period used for analyzing loss emergence and estimating loss factors. The changes were implemented as of April 1, 2013 and resulted in no material change in the total amount of the allowance for loan losses. Management made the following principal changes to the methodology during the second quarter of 2013:



		•	Established a more granular stratification of the major loan segments to enhance the homogeneity of the loan classes. For the loss-rate analysis, the Company previously segmented loans into three primary groups—commercial, residential mortgage and consumer. The revised loan segments are commercial non-real estate, construction and land development, commercial real estate, residential mortgage and consumer. Both quantitative and qualitative factors are applied at the more detailed portfolio segments.


		•	Included portfolio risk ratings in loss-rate analysis. Commercial loans (commercial non-real estate, construction and land development and commercial real estate) are further subdivided by risk rating, and retail loans (residential mortgage and consumer) are further subdivided by delinquency. Previously, the methodology indirectly incorporated risk ratings and delinquencies.


		•	Lengthened the loss emergence period. The Company uses an eighteen month loss emergence period for commercial loans and a twelve month loss emergence period for retail loans. Historical loss rates are calculated for each commercial segment using a weighted average of three eighteen-month periods over a fourteen quarter look-back period, and for each retail segment using a weighted average of three twelve-month periods over a twelve quarter look-back period. Previously, historical loss rates for all loan segments were calculated using an average of three twelve month loss emergence periods over a three year look back period. As circumstances dictate, management will make adjustments to the loss history to reflect differences in current conditions as compared to those during the historical loss period. Conditions to be considered include problem loan trends, current business and economic conditions, credit concentrations, lending policies and procedures, lending staff, collateral values, loan profiles and volumes, loan review quality, and changes in competition and regulations.
	There were no changes in the methodology for the specific reserve analysis for loans individually evaluated for impairment or acquired credit-impaired loans.

	There were no other material changes or developments with respect to methodologies that the Company uses when applying what management believes are critical accounting policies and developing critical accounting estimates as disclosed in our Form 10-K for the year ended December 31, 2012.

Securities_Tables

Securities (Tables)	9 Months Ended
Securities (Tables)	Sep. 30, 2013
Amortized Cost and Fair Value of Available for Sale Securities	'
	The amortized cost and fair value of securities classified as available for sale and held to maturity follow (in thousands):
	Securitites Available for Sale


		September 30, 2013									December 31, 2012
					Gross		Gross						Gross		Gross
		Amortized			Unrealized		Unrealized		Fair		Amortized		Unrealized		Unrealized		Fair
		Cost			Gains		Losses		Value		Cost		Gains		Losses		Value
	US Treasury and government agency securities	$	615		$	6	$	1	$	620	$	18,246	$	19	$	—	$	18,265
	Municipal obligations		43,573			197		122		43,648		49,608		571		14		50,165
	Mortgage-backed securities		1,337,251			29,214		6,495		1,359,970		1,715,524		58,903		21		1,774,406
	CMOs		46,288			—		1,256		45,032		196,723		1,354		—		198,077
	Corporate debt securities		3,500			—		—		3,500		2,250		—		—		2,250
	Other equity securities		4,596			774		20		5,350		4,531		752		4		5,279

		$	1,435,823		$	30,191	$	7,894	$	1,458,120	$	1,986,882	$	61,599	$	39	$	2,048,442

Amortized Cost and Fair Value of Held to Maturity Securities	'
	Securitites Held to Maturity




		30-Sep-13									31-Dec-12
					Gross		Gross						Gross		Gross
		Amortized			Unrealized		Unrealized		Fair		Amortized		Unrealized		Unrealized		Fair
		Cost			Gains		Losses		Value		Cost		Gains		Losses		Value
	US Treasury and government agency securities	$	100,000		$	688	$	—	$	100,688	$	—	$	—	$	—	$	—
	Municipal obligations		195,662			1,137		5,291		191,508		164,493		16,017		—		180,510
	Mortgage-backed securities		995,686			9,273		2,118		1,002,841		180,397		3,429		—		183,826
	CMOs		1,374,734			2,615		18,519		1,358,830		1,323,128		23,942		941		1,346,129

		$	2,666,082		$	13,713	$	25,928	$	2,653,867	$	1,668,018	$	43,388	$	941	$	1,710,465

Available for Sale Securities Unrealized Losses	'

	The details for securities classified as available for sale with unrealized losses as of September 30, 2013 follow (in thousands):



		Losses < 12 months					Losses 12 months or >				Total
					Gross				Gross				Gross
		Fair			Unrealized		Fair		Unrealized		Fair		Unrealized
		Value			Losses		Value		Losses		Value		Losses
	US Treasury and government agency securities	$	—		$	—	$	104	$	1	$	104	$	1
	Municipal obligations		13,647			122		—		—		13,647		122
	Mortgage-backed securities		144,859			6,488		379		7		145,238		6,495
	CMOs		45,032			1,256		—		—		45,032		1,256
	Equity securities		3,290			19		2		1		3,292		20

		$	206,828		$	7,885	$	485	$	9	$	207,313	$	7,894



	The details for securities classified as available for sale with unrealized losses as of December 31, 2012 follows (in thousands):




		Losses < 12 months					Losses 12 months or >				Total
					Gross				Gross				Gross
		Fair			Unrealized		Fair		Unrealized		Fair		Unrealized
		Value			Losses		Value		Losses		Value		Losses
	Municipal obligations	$	5,278		$	14	$	—	$	—	$	5,278	$	14
	Mortgage-backed securities		57,752			14		1,097		7		58,849		21
	Equity securities		268			2		2		2		270		4

		$	63,298		$	30	$	1,099	$	9	$	64,397	$	39

Held to Maturity with Unrealized Losses	'
	The details for securities classified as held to maturity with unrealized losses as of September 30, 2013 follows (in thousands):




		Losses < 12 months					Losses 12 months or >				Total
					Gross				Gross				Gross
		Fair			Unrealized		Fair		Unrealized		Fair		Unrealized
		Value			Losses		Value		Losses		Value		Losses
	Municpal obligations	$	115,901		$	5,252	$	1,253	$	39	$	117,154	$	5,291
	Mortgage-backed securities		147,019			2,118		—		—		147,019		2,118
	CMOs		720,157			17,377		280,855		1,142		1,001,012		18,519

		$	983,077		$	24,747	$	282,108	$	1,181	$	1,265,185	$	25,928

	The details for securities classified as held to maturity with unrealized losses as of December 31, 2012 follows (in thousands):




		Losses < 12 months					Losses 12 months or >				Total
					Gross				Gross				Gross
		Fair			Unrealized		Fair		Unrealized		Fair		Unrealized
		Value			Losses		Value		Losses		Value		Losses
	CMOs	$	87,852		$	259	$	54,445	$	682	$	142,297	$	941

		$	87,852		$	259	$	54,445	$	682	$	142,297	$	941

Available for Sale Securities [Member]	'
Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity	'
	The following table presents the amortized cost and fair value of debt securities at September 30, 2013 by final contractual maturity (in thousands). Actual maturities will differ from final contractual maturities because of scheduled and early principal payments on mortgage-backed securities and CMOs and rights to call or repay other obligations with or without penalties.




		Amortized			Fair
		Cost			Value
	Debt Securities Available for Sale
	Due in one year or less	$	23,895		$	24,010
	Due after one year through five years		130,419			130,124
	Due after five years through ten years		154,962			161,485
	Due after ten years		1,121,951			1,137,151

	Total available for sale debt securities	$	1,431,227		$	1,452,770

HTM Securities Transferred from AFS [Member]	'
Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity	'
	Amortized			Fair
		Cost			Value
	Debt Securities Held to Maturity
	Due in one year or less	$	107,697		$	108,407
	Due after one year through five years		669,896			655,554
	Due after five years through ten years		121,588			117,864
	Due after ten years		1,766,901			1,772,042

	Total held to maturity securities	$	2,666,082		$	2,653,867

Loans_and_Allowance_for_Loan_L1

Loans and Allowance for Loan Losses (Tables)	9 Months Ended
Loans and Allowance for Loan Losses (Tables)	Sep. 30, 2013
Loans, Net of Unearned Income	'
	Loans, net of unearned income, consisted of the following:


			September 30,				December 31,
			2013				2012
			(In thousands)
	Originated loans:
	Commercial non-real estate		$	3,633,490			$	2,713,385
	Construction and land development			738,983				665,673
	Commercial real estate			1,816,402				1,548,402
	Residential mortgages			1,124,649				827,985
	Consumer			1,387,243				1,351,776

	Total originated loans		$	8,700,767			$	7,107,221

	Acquired loans:
	Commercial non-real estate		$	967,485			$	1,690,643
	Construction and land development			158,228				295,151
	Commercial real estate			1,038,287				1,279,546
	Residential mortgages			347,054				486,444
	Consumer			130,649				202,974

	Total acquired loans		$	2,641,703			$	3,954,758

	Covered loans:
	Commercial non-real estate		$	24,340			$	29,260
	Construction and land development			23,197				28,482
	Commercial real estate			60,280				95,146
	Residential mortgages			223,494				263,515
	Consumer			60,691				99,420

	Total covered loans		$	392,002			$	515,823

	Total loans:
	Commercial non-real estate		$	4,625,315			$	4,433,288
	Construction and land development			920,408				989,306
	Commercial real estate			2,914,969				2,923,094
	Residential mortgages			1,695,197				1,577,944
	Consumer			1,578,583				1,654,170

	Total loans		$	11,734,472			$	11,577,802

Schedule of Activity in Loss Share Receivable	'
	The following schedule shows activity in the loss share receivable for the nine months ended September 30, 2013 and 2012 (in thousands):




			Nine Months Ended
			September 30,				September 30,
			2013				2012
	Balance, January 1		$	177,844			$	231,085
	Accretion (amortization)			(590	)			5,000
	Charge-offs, write-downs and other losses			(190	)			36,685
	External expenses qualifying under loss share agreement			7,918				7,422
	Payments received from the FDIC			(60,886	)			(84,130	)

	Ending balance		$	124,096			$	196,062

Allowance for Loan Losses by Portfolio Segment and Related Recorded Investment in Loans	'
	The following schedule shows activity in the allowance for loan losses by portfolio segment for the nine months ended September 30, 2013 and September 30, 2012 as well as the corresponding recorded investment in loans at the end of each period.




							Construction
			Commercial				and land				Commercial				Residential
			non-real estate				development				real estate				mortgages				Consumer				Total
	(In thousands)		Nine Months Ended September 30, 2013
	Originated loans
	Allowance for loan losses:
	Beginning balance		$	20,775			$	11,415			$	26,959			$	6,406			$	13,219			$	78,774
	Charge-offs			(5,199	)			(7,548	)			(3,718	)			(1,549	)			(13,372	)			(31,386	)
	Recoveries			3,381				1,243				2,340				991				4,336				12,291
	Net provision for loan losses			11,152				2,072				(3,698	)			64				8,152				17,742

	Ending balance		$	30,109			$	7,182			$	21,883			$	5,912			$	12,335			$	77,421

	Ending balance:
	Individually evaluated for impairment		$	325			$	211			$	946			$	—			$	—			$	1,482
	Collectively evaluated for impairment		$	29,784			$	6,971			$	20,937			$	5,912			$	12,335			$	75,939
	Loans:
	Ending balance:		$	3,633,490			$	738,983			$	1,816,402			$	1,124,649			$	1,387,243			$	8,700,767
	Individually evaluated for impairment		$	8,911			$	16,044			$	21,170			$	—			$	—			$	46,125
	Collectively evaluated for impairment		$	3,624,579			$	722,939			$	1,795,232			$	1,124,649			$	1,387,243			$	8,654,642

	Acquired loans
	Allowance for loan losses:
	Beginning balance		$	788			$	—			$	—			$	—			$	—			$	788
	Charge-offs			—				—				—				—				—				—
	Recoveries			—				—				—				—				—				—
	Net provision for loan losses			(788	)			—				463				—				—				(325	)

	Ending balance		$	—			$	—			$	463			$	—			$	—			$	463

	Ending balance:
	Individually evaluated for impairment		$	—			$	—			$	463			$	—			$	—			$	463
	Collectively evaluated for impairment		$	—			$	—			$	—			$	—			$	—			$	—
	Acquired-impaired		$	—			$	—			$	—			$	—			$	—			$	—
	Loans:
	Ending balance:		$	967,485			$	158,228			$	1,038,287			$	347,054			$	130,649			$	2,641,703
	Individually evaluated for impairment		$	2,179			$	730			$	2,371			$	502			$	—			$	5,782
	Collectively evaluated for impairment		$	946,339			$	142,418			$	1,010,484			$	341,165			$	130,544			$	2,570,950
	Acquired-impaired		$	18,967			$	15,080			$	25,432			$	5,387			$	105			$	64,971




							Construction
			Commercial				and land				Commercial				Residential
			non-real estate				development				real estate				mortgages				Consumer				Total
	(In thousands)		Nine Months Ended September 30, 2013
	Covered loans
	Allowance for loan losses:
	Beginning balance		$	2,162			$	5,623			$	9,433			$	30,471			$	8,920			$	56,609
	Charge-offs			(681	)			(1,784	)			(4,316	)			(947	)			(1,145	)			(8,873	)
	Recoveries			90				554				2,395				13				67				3,119
	Net provision for loan losses (a)			(328	)			(1,600	)			1,197				4,723				3,995				7,987
	Increase in FDIC loss share receivable (a)			447				(314	)			(732	)			1,261				835				1,497

	Ending balance		$	1,690			$	2,479			$	7,977			$	35,521			$	12,672			$	60,339

	Ending balance:
Individually evaluated for impairment		$	—			$	—			$	—			$	—			$	—			$	—
Collectively evaluated for impairment		$	—			$	—			$	—			$	—			$	—			$	—
Amounts related to loans acquired with deteriorated credit quality		$	1,690			$	2,479			$	7,977			$	35,521			$	12,672			$	60,339
Loans:
Ending balance:		$	24,340			$	23,197			$	60,280			$	223,494			$	60,691			$	392,002
Individually evaluated for impairment		$	—			$	—			$	—			$	—			$	—			$	—
Collectively evaluated for impairment		$	—			$	—			$	—			$	—			$	—			$	—
Acquired-impaired		$	24,340			$	23,197			$	60,280			$	223,494			$	60,691			$	392,002

Total loans
Allowance for loan losses:
Beginning balance		$	23,725			$	17,038			$	36,392			$	36,877			$	22,139			$	136,171
Charge-offs			(5,880	)			(9,332	)			(8,034	)			(2,496	)			(14,517	)			(40,259	)
Recoveries			3,471				1,797				4,735				1,004				4,403				15,410
Net provision for loan losses (a)			10,036				472				(2,038	)			4,787				12,147				25,404
Increase in FDIC loss share receivable (a)			447				(314	)			(732	)			1,261				835				1,497

Ending balance		$	31,799			$	9,661			$	30,323			$	41,433			$	25,007			$	138,223

Ending balance:
Individually evaluated for impairment		$	325			$	211			$	1,409			$	—			$	—			$	1,945
Collectively evaluated for impairment		$	29,784			$	6,971			$	20,937			$	5,912			$	12,335			$	75,939
Acquired-impaired		$	1,690			$	2,479			$	7,977			$	35,521			$	12,672			$	60,339
Loans:
Ending balance:		$	4,625,315			$	920,408			$	2,914,969			$	1,695,197			$	1,578,583			$	11,734,472
Individually evaluated for impairment		$	11,090			$	16,774			$	23,541			$	502			$	—			$	51,907
Collectively evaluated for impairment		$	4,570,918			$	865,357			$	2,805,716			$	1,465,814			$	1,517,787			$	11,225,592
Acquired-impaired		$	43,307			$	38,277			$	85,712			$	228,881			$	60,796			$	456,973



(a)	The $8.0 million provision expense for impairment on certain pools of covered loans is reported net of the benefit attributable to the FDIC loss share agreement as reflected by the related increase in the loss share receivable.



						Residential
		Commercial				mortgages				Consumer				Total
(In thousands)		Nine Months Ended September 30, 2012
Originated loans
Allowance for loan losses:
Beginning balance		$	60,211			$	4,894			$	18,141			$	83,246
Charge-offs			(18,036	)			(4,889	)			(11,663	)			(34,588	)
Recoveries			4,225				310				3,060				7,595
Net provision for loan losses			12,618				4,336				6,542				23,496

Ending balance		$	59,018			$	4,651			$	16,080			$	79,749

Ending balance:
Individually evaluated for impairment		$	8,469			$	133			$	—			$	8,602
Collectively evaluated for impairment		$	50,549			$	4,518			$	16,080			$	71,147
Loans:
Ending balance:		$	4,465,736			$	757,471			$	1,357,987			$	6,581,194
Individually evaluated for impairment		$	78,337			$	7,524			$	—			$	85,861
Collectively evaluated for impairment		$	4,387,399			$	749,947			$	1,357,987			$	6,495,333

Covered loans
Allowance for loan losses:
Beginning balance		$	18,203			$	9,024			$	14,408			$	41,635
Charge-offs			(22,839	)			—				—				(22,839	)
Recoveries			—				—				—				—
Net provision for loan losses (a)			12,744				2,196				(12,295	)			2,645
Increase in FDIC loss share receivable (a)			22,650				11,189				562				34,401

Ending balance		$	30,758			$	22,409			$	2,675			$	55,842

Ending balance:
Individually evaluated for impairment		$	—			$	—			$	—			$	—
Collectively evaluated for impairment		$	—			$	—			$	—			$	—
Acquired-impaired		$	30,758			$	22,409			$	2,675			$	55,842
Loans:
Ending balance:		$	176,724			$	271,618			$	107,390			$	555,732
Individually evaluated for impairment		$	—			$	—			$	—			$	—
Collectively evaluated for impairment		$	—			$	—			$	—			$	—
Acquired-impaired		$	176,724			$	271,618			$	107,390			$	555,732




		Commercial				Residential				Consumer				Total
		Commercial				mortgages				Consumer				Total
(In thousands)		Nine Months Ended September 30, 2012
Total loans
Allowance for loan losses:
Beginning balance		$	78,414			$	13,918			$	32,549			$	124,881
Charge-offs			(40,875	)			(4,889	)			(11,663	)			(57,427	)
Recoveries			4,225				310				3,060				7,595
Net provision for loan losses (a)			25,362				6,532				(5,753	)			26,141
Increase in FDIC loss share receivable (a)			22,650				11,189				562				34,401

Ending balance		$	89,776			$	27,060			$	18,755			$	135,591

Ending balance:
Individually evaluated for impairment		$	8,469			$	133			$	—			$	8,602
Collectively evaluated for impairment		$	50,549			$	4,518			$	16,080			$	71,147
Acquired-impaired		$	30,758			$	22,409			$	2,675			$	55,842
Loans:
Ending balance:		$	8,187,469			$	1,561,640			$	1,685,339			$	11,434,448
Individually evaluated for impairment		$	78,337			$	7,524			$	—			$	85,861
Collectively evaluated for impairment (b)		$	7,758,832			$	1,259,767			$	1,577,265			$	10,595,864
Acquired-impaired		$	350,300			$	294,349			$	108,074			$	752,723



(a)	The $2.6 million provision expense for impairment on certain pools of covered loans is reported net of the benefit attributable to the FDIC loss share agreements as reflected by the related increase in the loss share receivable.
(b)	In accordance with purchase accounting rules, acquired non-impaired loans were recorded at their fair value at the time of acquisition with no carryover of losses and are included in the ending balance of loans collectively evaluated for impairment. No allowance had been established on these acquired loans as of September 30, 2012.
Summary of Composition of Non-Accrual Loans by Portfolio Segment	'
	The following tables show the composition of nonaccrual loans by portfolio segment and class. Acquired-impaired and certain covered loans are considered to be performing due to the application of the accretion method and are excluded from the table. Covered loans accounted for using the cost recovery method do not have an accretable yield and are disclosed below as nonaccrual loans. Acquired-performing loans that have subsequently been placed on nonaccrual status are also disclosed below.




	(In thousands)		September 30,				December 31,
	(In thousands)		2013				2012
	Originated loans:
	Commercial non-real estate		$	14,118			$	18,941
	Construction and land development			19,817				32,777
	Commercial real estate			39,695				40,190
	Residential mortgages			13,148				7,705
	Consumer			4,684				3,815

	Total originated loans		$	91,462			$	103,428

	Acquired loans:
	Commercial non-real estate		$	3,381			$	4,326
	Construction and land development			2,025				5,967
	Commercial real estate			6,123				6,609
	Residential mortgages			9,664				10,551
	Consumer			1,890				2,634

	Total acquired loans		$	23,083			$	30,087

	Covered loans:
	Commercial non-real estate		$	3			$	—
	Construction and land development			2,624				2,487
	Commercial real estate			1,179				1,220
	Residential mortgages			942				393
	Consumer			415				—

	Total covered loans		$	5,163			$	4,100

	Total loans:
	Commercial non-real estate		$	17,502			$	23,267
	Construction and land development			24,466				41,231
	Commercial real estate			46,997				48,019
	Residential mortgages			23,754				18,649
	Consumer			6,989				6,449

	Total loans		$	119,708			$	137,615

Schedule of Troubled Debt Restructurings Occurred During Period by Portfolio Segment	'
	The table below details TDRs that occurred during the nine months ended September 30, 2013 and September 30, 2012 by portfolio segment and TDRs that subsequently defaulted within twelve months of modification (dollar amounts in thousands). All troubled debt restructurings are rated substandard and individually evaluated for impairment.




			Nine Months Ended
			September 30, 2013												September 30, 2012
							Pre-Modification				Post-Modification								Pre-Modification				Post-Modification
							Outstanding				Outstanding								Outstanding				Outstanding
			Number of				Recorded				Recorded				Number of				Recorded				Recorded
	Troubled Debt Restructurings:		Contracts				Investment				Investment				Contracts				Investment				Investment
	Originated loans:
	Commercial non-real estate			1			$	926			$	913				1			$	790			$	790
	Construction and land development			—				—				—				—				—				—
	Commercial real estate			4				1,332				1,270				9				9,475				8,582
	Residential mortgages			1				456				343				2				711				561
	Consumer			—				—				—				—				—				—

	Total originated loans			6			$	2,714			$	2,526				12			$	10,976			$	9,933

	Aquired loans:
	Commercial non-real estate			—			$	—			$	—				—			$	—			$	—
	Construction and land development			—				—				—				—				—				—
	Commercial real estate			1				512				476				—				—				—
	Residential mortgages			1				514				500				—				—				—
	Consumer			—				—				—				—				—				—

	Total acquired loans			2			$	1,026			$	976				—			$	—			$	—

	Covered loans:
	Commercial non-real estate			—			$	—			$	—				—			$	—			$	—
	Construction and land development			—				—				—				—				—				—
	Commercial real estate			—				—				—				—				—				—
	Residential mortgages			—				—				—				—				—				—
	Consumer			—				—				—				—				—				—

	Total covered loans			—			$	—			$	—				—			$	—			$	—

	Total loans:
	Commercial non-real estate			1			$	926			$	913				1			$	790			$	790
	Construction and land development			—				—				—				—				—				—
	Commercial real estate			5				1,844				1,746				9				9,475				8,582
	Residential mortgages			2				970				843				2				711				561
	Consumer			—				—				—				—				—				—

	Total loans			8			$	3,740			$	3,502				12			$	10,976			$	9,933

Summary of Impaired Loans Disaggregated by Class	'
	The tables below present loans that are individually evaluated for impairment disaggregated by class at September 30, 2013 and December 31, 2012:




							Unpaid								Average				Interest
			Recorded				Principal				Related				Recorded				Income
	September 30, 2013		Investment				Balance				Allowance				Investment				Recognized
											(In thousands)
	Originated loans:
	With no related allowance recorded:
	Commercial non-real estate		$	848			$	1,073			$	—			$	212			$	12
	Construction and land development			9,798				11,431				—				2,450				53
	Commercial real estate			6,608				8,430				—				18,527				344
	Residential mortgages			—				—				—				328				—
	Consumer			—				—				—				1,267				—

				17,254				20,934				—				22,784				409
	With an allowance recorded:
	Commercial non-real estate			8,063				8,365				325				9,929				167
	Construction and land development			6,246				6,246				211				1,562				40
	Commercial real estate			14,562				14,866				946				22,427				413
	Residential mortgages			—				—				—				134				—
	Consumer			—				—				—				1,281				—

				28,871				29,477				1,482				35,333				620
	Total:
	Commercial non-real estate			8,911				9,438				325				10,141				179
	Construction and land development			16,044				17,677				211				4,012				93
	Commercial real estate			21,170				23,296				946				40,954				757
	Residential mortgages			—				—				—				462				—
	Consumer			—				—				—				2,548				—

	Total originated loans		$	46,125			$	50,411			$	1,482			$	58,117			$	1,029

	Acquired loans:
	With no related allowance recorded:
	Commercial non-real estate		$	2,179			$	2,186			$	—			$	545			$	—
	Construction and land development			730				754				—				183				—
	Commercial real estate			476				486				—				1,079				47
	Residential mortgages			502				509				—				382				—
	Consumer			—				—				—				—				—

				3,887				3,935				—				2,189				47
	With an allowance recorded:
	Commercial non-real estate			—				—				—				3,434				63
	Construction and land development			—				—				—				197				—
	Commercial real estate			1,895				1,931				463				3,328				—
	Residential mortgages			—				—				—				1,057				—
	Consumer			—				—				—				—				—

				1,895				1,931				463				8,016				63
	Total:
	Commercial non-real estate			2,179				2,186				—				3,979				63
	Construction and land development			730				754				—				380				—
	Commercial real estate			2,371				2,417				463				4,407				47
	Residential mortgages			502				509				—				1,439				—
	Consumer			—				—				—				—				—

	Total acquired loans		$	5,782			$	5,866			$	463			$	10,205			$	110




						Unpaid								Average				Interest
		Recorded				Principal				Related				Recorded				Income
September 30, 2013		Investment				Balance				Allowance				Investment				Recognized
Covered loans:
With no related allowance recorded:
Commercial non-real estate		$	—			$	—			$	—			$	—			$	—
Construction and land development			—				—				—				—				—
Commercial real estate			—				—				—				—				—
Residential mortgages			—				—				—				—				—
Consumer			—				—				—				—				—

			—				—				—				—				—
With an allowance recorded:
Commercial non-real estate			—				—				—				—				—
Construction and land development			—				—				—				—				—
Commercial real estate			—				—				—				—				—
Residential mortgages			—				—				—				—				—
Consumer			—				—				—				—				—

			—				—				—				—				—
Total:
Commercial non-real estate			—				—				—				—				—
Construction and land development			—				—				—				—				—
Commercial real estate			—				—				—				—				—
Residential mortgages			—				—				—				—				—
Consumer			—				—				—				—				—

Total covered loans		$	—			$	—			$	—			$	—			$	—

Total loans:
With no related allowance recorded:
Commercial non-real estate		$	3,027			$	3,259			$	—			$	757			$	12
Construction and land development			10,528				12,185				—				2,633				53
Commercial real estate			7,084				8,916				—				19,606				391
Residential mortgages			502				509				—				710				—
Consumer			—				—				—				1,267				—

			21,141				24,869				—				24,973				456
With an allowance recorded:
Commercial non-real estate			8,063				8,365				325				13,363				230
Construction and land development			6,246				6,246				211				1,759				40
Commercial real estate			16,457				16,797				1,409				25,755				413
Residential mortgages			—				—				—				1,191				—
Consumer			—				—				—				1,281				—

			30,766				31,408				1,945				43,349				683
Total:
Commercial non-real estate			11,090				11,624				325				14,120				242
Construction and land development			16,774				18,431				211				4,392				93
Commercial real estate			23,541				25,713				1,409				45,361				804
Residential mortgages			502				509				—				1,901				—
Consumer			—				—				—				2,548				—

Total loans		$	51,907			$	56,277			$	1,945			$	68,322			$	1,139




						Unpaid								Average				Interest
		Recorded				Principal				Related				Recorded				Income
December 31, 2012		Investment				Balance				Allowance				Investment				Recognized
										(In thousands)
Originated loans:
With no related allowance recorded:
Commercial		$	34,705			$	55,101			$	—			$	23,793			$	464
Residential mortgages			2,721				4,874				—				3,255				155
Consumer			—				—				—				—				—

			37,426				59,975				—				27,048				619
With an allowance recorded:
Commercial			35,850				37,917				6,377				41,232				703
Residential mortgages			—				—				—				4,619				—
Consumer			—				—				—				—				—

			35,850				37,917				6,377				45,851				703
Total:
Commercial			70,555				93,018				6,377				65,025				1,167
Residential mortgages			2,721				4,874				—				7,874				155
Consumer			—				—				—				—				—

Total originated loans		$	73,276			$	97,892			$	6,377			$	72,899			$	1,322

Acquired loans:
With no related allowance recorded:
Commercial		$	—			$	—			$	—			$	—			$	—
Residential mortgages			—				—				—				—				—
Consumer			—				—				—				—				—

			—				—				—				—				—
With an allowance recorded:
Commercial			6,202				6,386				788				1,551				—
Residential mortgages			—				—				—				—				—
Consumer			—				—				—				—				—

			6,202				6,386				788				1,551				—
Total:
Commercial			6,202				6,386				788				1,551				—
Residential mortgages			—				—				—				—				—
Consumer			—				—				—				—				—

Total acquired loans		$	6,202			$	6,386			$	788			$	1,551			$	—




						Unpaid								Average				Interest
		Recorded				Principal				Related				Recorded				Income
December 31, 2012		Investment				Balance				Allowance				Investment				Recognized
										(In thousands)
Covered loans:
With no related allowance recorded:
Commercial		$	3,707			$	10,208			$	—			$	6,008			$	—
Residential mortgages			393				787				—				446				—
Consumer			—				—				—				—				—

			4,100				10,995				—				6,454				—
With an allowance recorded:
Commercial			—				—				—				—				—
Residential mortgages			—				—				—				—				—
Consumer			—				—				—				—				—

			—				—				—				—				—
Total:
Commercial			3,707				10,208				—				6,008				—
Residential mortgages			393				787				—				446				—
Consumer			—				—				—				—				—

Total covered loans		$	4,100			$	10,995			$	—			$	6,454			$	—

Total loans:
With no related allowance recorded:
Commercial		$	38,412			$	65,309			$	—			$	29,801			$	464
Residential mortgages			3,114				5,661				—				3,701				155
Consumer			—				—				—				—				—

			41,526				70,970				—				33,502				619
With an allowance recorded:
Commercial			42,052				44,303				7,165				42,783				703
Residential mortgages			—				—				—				4,619				—
Consumer			—				—				—				—				—

			42,052				44,303				7,165				47,402				703
Total:
Commercial			80,464				109,612				7,165				72,584				1,167
Residential mortgages			3,114				5,661				—				8,320				155
Consumer			—				—				—				—				—

Total loans		$	83,578			$	115,273			$	7,165			$	80,904			$	1,322

Summary of Age Analysis of Past Due Loans	'
	The following table presents the age analysis of past due loans at September 30, 2013 and December 31, 2012:




																											Recorded
											Greater than																investment
			30-59 days				60-89 days				90 days				Total								Total				> 90 days
	30-Sep-13		past due				past due				past due				past due				Current				Loans				and accruing
															(In thousands)
	Originated loans:
	Commercial non-real estate		$	7,369			$	2,891			$	9,615			$	19,875			$	3,613,615			$	3,633,490			$	1,268
	Construction and land development			2,083				2,131				18,079				22,293				716,690				738,983				8,183
	Commercial real estate			11,753				2,215				16,383				30,351				1,786,051				1,816,402				1,309
	Residential mortgages			224				2,484				4,018				6,726				1,117,923				1,124,649				—
	Consumer			4,974				2,238				3,686				10,898				1,376,345				1,387,243				1,752

	Total		$	26,403			$	11,959			$	51,781			$	90,143			$	8,610,624			$	8,700,767			$	12,512

	Acquired loans:
	Commercial non-real estate		$	1,586			$	414			$	1,396			$	3,396			$	964,089			$	967,485			$	700
	Construction and land development			1,481				897				594				2,972				155,256				158,228				56
	Commercial real estate			2,548				703				5,763				9,014				1,029,273				1,038,287				2,306
	Residential mortgages			594				970				6,337				7,901				339,153				347,054				—
	Consumer			393				158				1,033				1,584				129,065				130,649				46

	Total		$	6,602			$	3,142			$	15,123			$	24,867			$	2,616,836			$	2,641,703			$	3,108

	Covered loans:
	Commercial non-real estate		$	—			$	—			$	—			$	—			$	24,340			$	24,340			$	—
	Construction and land development			—				—				2,624				2,624				20,573				23,197				—
	Commercial real estate			—				—				675				675				59,605				60,280				—
	Residential mortgages			—				—				667				667				222,827				223,494				—
	Consumer			5				2				322				329				60,362				60,691				—

	Total		$	5			$	2			$	4,288			$	4,295			$	387,707			$	392,002			$	—

	Total loans:
	Commercial non-real estate		$	8,955			$	3,305			$	11,011			$	23,271			$	4,602,044			$	4,625,315			$	1,968
	Construction and land development			3,564				3,028				21,297				27,889				892,519				920,408				8,239
	Commercial real estate			14,301				2,918				22,821				40,040				2,874,929				2,914,969				3,615
	Residential mortgages			818				3,454				11,022				15,294				1,679,903				1,695,197				—
	Consumer			5,372				2,398				5,041				12,811				1,565,772				1,578,583				1,798

	Total		$	33,010			$	15,103			$	71,192			$	119,305			$	11,615,167			$	11,734,472			$	15,620




																											Recorded
											Greater than																investment
			30-59 days				60-89 days				90 days				Total								Total				> 90 days
	December 31, 2012		past due				past due				past due				past due				Current				Loans				and accruing
															(In thousands)
	Originated loans:
	Commercial		$	24,398			$	16,508			$	46,355			$	87,261			$	4,840,199			$	4,927,460			$	5,262
	Residential mortgages			11,500				3,303				4,100				18,903				809,082				827,985				—
	Consumer			10,348				2,150				4,231				16,729				1,335,047				1,351,776				2,474

	Total		$	46,246			$	21,961			$	54,686			$	122,893			$	6,984,328			$	7,107,221			$	7,736

	Acquired loans:
	Commercial		$	28,791			$	4,666			$	15,774			$	49,231			$	3,216,109			$	3,265,340			$	4,354
Residential mortgages			9,641				1,290				8,996				19,927				466,517				486,444				1,106
Consumer			1,282				430				2,170				3,882				199,092				202,974				47

Total		$	39,714			$	6,386			$	26,940			$	73,040			$	3,881,718			$	3,954,758			$	5,507

Covered loans:
Commercial		$	—			$	—			$	3,707			$	3,707			$	149,181			$	152,888			$	—
Residential mortgages			—				—				393				393				263,122				263,515				—
Consumer			—				—				—				—				99,420				99,420				—

Total		$	—			$	—			$	4,100			$	4,100			$	511,723			$	515,823			$	—

Total loans:
Commercial		$	53,189			$	21,174			$	65,836			$	140,199			$	8,205,489			$	8,345,688			$	9,616
Residential mortgages			21,141				4,593				13,489				39,223				1,538,721				1,577,944				1,106
Consumer			11,630				2,580				6,401				20,611				1,633,559				1,654,170				2,521

Total		$	85,960			$	28,347			$	85,726			$	200,033			$	11,377,769			$	11,577,802			$	13,243

Credit Risk Profile Based on Payment Activity	'
	Consumer Credit Exposure

	Credit Risk Profile Based on Payment Activity




			September 30, 2013																December 31, 2012
			Originated				Acquired				Covered				Total				Originated				Acquired				Covered			Total
			(In thousands)																(In thousands)
	Performing		$	1,382,144			$	128,759			$	60,691			$	1,571,594			$	1,345,487			$	200,292			$	99,420		$	1,645,199
	Nonperforming			5,099				1,890				—				6,989				6,289				2,682				—			8,971

	Total		$	1,387,243			$	130,649			$	60,691			$	1,578,583			$	1,351,776			$	202,974			$	99,420		$	1,654,170

Changes in Carrying Amount of Covered Acquired Loans and Accretable Yield for Loans Receivable	'
	Changes in the carrying amount of acquired-impaired loans and accretable yield are presented in the following table for the nine months ended September 30, 2013 and the year ended December 31, 2012:




			September 30, 2013																December 31, 2012
			Covered								Non-covered								Covered								Non-covered
			Carrying								Carrying								Carrying								Carrying
			Amount				Accretable				Amount				Accretable				Amount				Accretable				Amount			Accretable
			of Loans				Yield				of Loans				Yield				of Loans				Yield				of Loans			Yield
	(In thousands)
	Balance at beginning of period		$	515,823			$	115,594			$	141,201			$	203,186			$	671,443			$	153,137			$	339,452		$	130,691
	Additions			—				—				—				—				—				—				—			—
	Payments received, net			(150,405	)			(861	)			(106,444	)			(37,961	)			(200,719	)			—				(250,338	)		—
	Accretion			26,584				(26,584	)			30,213				(30,213	)			45,099				(45,099	)			52,087			(52,087	)
	Increase (decrease) in expected cash flows based on actual cash flow and changes in cash flow assumptions			—				(12,944	)			—				6,465				—				(19,326	)			—			23,688
	Net transfers from (to) nonaccretable difference to accretable yield			—				22,611				—				5,636				—				26,882				—			100,894

	Balance at end of period		$	392,002			$	97,816			$	64,970			$	147,113			$	515,823			$	115,594			$	141,201		$	203,186

Troubled Debt Restructurings That Subsequently Defaulted [Member]	'
Schedule of Troubled Debt Restructurings Occurred During Period by Portfolio Segment	'

					Nine Months Ended
			September 30, 2013								September 30, 2012
	Troubled Debt Restructurings That Subsequently Defaulted:		Number of				Recorded				Number of				Recorded
	Troubled Debt Restructurings That Subsequently Defaulted:		Contracts				Investment				Contracts				Investment
	Originated loans:
	Commercial non-real estate			—			$	—				—			$	—
	Construction and land development			—				—				—				—
	Commercial real estate			—				—				2				1,787
	Residential mortgages			—				—				—				—
	Consumer			—				—				—				—

	Total originated loans			—			$	—				2			$	1,787

	Aquired loans:
	Commercial non-real estate			—			$	—				—			$	—
	Construction and land development			—				—				—				—
	Commercial real estate			—				—				—				—
	Residential mortgages			—				—				—				—
	Consumer			—				—				—				—

	Total acquired loans			—			$	—				—			$	—

	Covered loans:
	Commercial non-real estate			—			$	—				—			$	—
	Construction and land development			—				—				—				—
	Commercial real estate			—				—				—				—
	Residential mortgages			—				—				—				—
	Consumer			—				—				—				—

	Total covered loans			—			$	—				—			$	—

	Total loans:
	Commercial non-real estate			—			$	—				—			$	—
	Construction and land development			—				—				—				—
	Commercial real estate			—				—				2				1,787
	Residential mortgages			—				—				—				—
	Consumer			—				—				—				—

	Total loans			—			$	—				2			$	1,787

Commercial Non-Real Estate [Member]	'
Schedule of Credit Quality Indicators of Various Classes of Loans	'
	The following tables present the credit quality indicators of the Company’s various classes of loans at September 30, 2013 and December 31, 2012.

	Commercial Non-Real Estate Credit Exposure

	Credit Risk Profile by Internally Assigned Grade




			September 30, 2013																December 31, 2012
			Originated				Acquired				Covered				Total				Originated				Acquired				Covered			Total
			(In thousands)																(In thousands)
	Grade:
	Pass		$	3,459,635			$	877,964			$	14,063			$	4,351,662			$	2,610,970			$	1,588,435			$	14,855		$	4,214,260
	Pass-Watch			106,657				41,741				118				148,516				32,393				52,361				74			84,828
	Special Mention			31,600				28,308				—				59,908				23,550				6,267				3,226			33,043
	Substandard			35,598				18,547				7,820				61,965				46,472				43,219				8,433			98,124
	Doubtful			—				925				2,339				3,264				—				361				2,672			3,033
	Loss			—				—				—				—				—				—				—			—

	Total		$	3,633,490			$	967,485			$	24,340			$	4,625,315			$	2,713,385			$	1,690,643			$	29,260		$	4,433,288

Construction and Land Development [Member]	'
Schedule of Credit Quality Indicators of Various Classes of Loans	'
	Construction Credit Exposure

	Credit Risk Profile by Internally Assigned Grade




			30-Sep-13																31-Dec-12
			Originated				Acquired				Covered				Total				Originated				Acquired				Covered			Total
			(In thousands)																(In thousands)
	Grade:
	Pass		$	681,999			$	130,457			$	230			$	812,686			$	557,511			$	249,269			$	331		$	807,111
	Pass-Watch			16,728				8,684				598				26,010				13,705				2,993				1,028			17,726
	Special Mention			944				1,446				197				2,587				30,522				12,248				420			43,190
	Substandard			39,312				17,637				10,241				67,190				63,925				30,637				7,311			101,873
	Doubtful			—				4				11,931				11,935				10				4				19,392			19,406
	Loss			—				—				—				—				—				—				—			—

	Total		$	738,983			$	158,228			$	23,197			$	920,408			$	665,673			$	295,151			$	28,482		$	989,306

Commercial Real Estate [Member]	'
Schedule of Credit Quality Indicators of Various Classes of Loans	'
	Commercial Real Estate Credit Exposure

	Credit Risk Profile by Internally Assigned Grade




			30-Sep-13																31-Dec-12
			Originated				Acquired				Covered				Total				Originated				Acquired				Covered			Total
			(In thousands)																(In thousands)
	Grade:
	Pass		$	1,656,114			$	943,760			$	5,853			$	2,605,727			$	1,353,453			$	1,173,617			$	16,693		$	2,543,763
	Pass-Watch			32,762				41,172				4,823				78,757				36,507				16,051				15,015			67,573
	Special Mention			3,618				7,864				3,127				14,609				29,912				21,116				3,787			54,815
	Substandard			123,890				45,491				32,989				202,370				128,088				68,762				31,298			228,148
	Doubtful			18				—				13,488				13,506				442				—				28,353			28,795
	Loss			—				—				—				—				—				—				—			—

	Total		$	1,816,402			$	1,038,287			$	60,280			$	2,914,969			$	1,548,402			$	1,279,546			$	95,146		$	2,923,094

Residential Mortgage Loans [Member]	'
Schedule of Credit Quality Indicators of Various Classes of Loans	'
	Residential Mortgage Credit Exposure

	Credit Risk Profile Based on Payment Activity




			September 30, 2013																December 31, 2012
			Originated				Acquired				Covered				Total				Originated				Acquired				Covered			Total
			(In thousands)																(In thousands)
	Performing		$	1,110,952			$	337,390			$	223,101			$	1,671,443			$	820,281			$	475,893			$	263,515		$	1,559,689
	Nonperforming			13,697				9,664				393				23,754				7,704				10,551				—			18,255

	Total		$	1,124,649			$	347,054			$	223,494			$	1,695,197			$	827,985			$	486,444			$	263,515		$	1,577,944

Fair_Value_Tables

Fair Value (Tables)	9 Months Ended
Fair Value (Tables)	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following tables present for each of the fair value hierarchy levels the Company’s assets and liabilities that are measured at fair value (in thousands) on a recurring basis in the consolidated balance sheets.


			September 30, 2013
			Level 1		Level 2		Total
	Assets
	Available for sale debt securities:
	U.S. Treasury and government agency securities		$	620	$	—	$	620
	Municipal obligations			—		43,648		43,648
	Corporate debt securities			3,500		—		3,500
	Mortgage-backed securities			—		1,359,970		1,359,970
	Collateralized mortgage obligations			—		45,032		45,032
	Equity securities			5,350		—		5,350

	Total available-for-sale securities			9,470		1,448,650		1,458,120

	Derivative assets (1)			—		16,062		16,062

	Total recurring fair value measurements - assets		$	9,470	$	1,464,712	$	1,474,182

	Liabilities
	Derivative liabilities (1)		$	—	$	15,929	$	15,929

	Total recurring fair value measurements - liabilities		$	—	$	15,929	$	15,929


	-1	For further disaggregation of derivative assets and liabilities, see Note 5 - Derivatives.


			December 31, 2012
			Level 1		Level 2		Total
	Assets
	Available for sale debt securities:
	U.S. Treasury and government agency securities		$	18,265	$	—	$	18,265
	Municipal obligations			—		50,165		50,165
	Corporate debt securities			2,250		—		2,250
	Mortgage-backed securities			—		1,774,406		1,774,406
	Collateralized mortgage obligations			—		198,077		198,077
	Equity securities			5,279		—		5,279

	Total available-for-sale securities			25,794		2,022,648		2,048,442

	Derivative assets (1)			—		20,093		20,093

	Total recurring fair value measurements - assets		$	25,794	$	2,042,741	$	2,068,535

	Liabilities
	Derivative liabilities (1)		$	—	$	21,100	$	21,100

	Total recurring fair value measurements - liabilities		$	—	$	21,100	$	21,100


	-1	For further disaggregation of derivative assets and liabilities, see Note 5 - Derivatives.
Schedule of Financial Assets Measured at Fair Value on Nonrecurring Basis	'
	The following tables present for each of the fair value hierarchy levels the Company’s financial assets that are measured at fair value (in thousands) on a nonrecurring basis.


			September 30, 2013
			Level 1		Level 2		Level 3		Total
	Collateral-dependent impaired loans		$	—	$	27,981	$	—	$	27,981
	Other real estate owned			—		—		21,148		21,148

	Total nonrecurring fair value measurements		$	—	$	27,981	$	21,148	$	49,129


			31-Dec-12
			Level 1		Level 2		Level 3		Total
	Collateral-dependent impaired loans		$	—	$	72,694	$	—	$	72,694
	Other real estate owned			—		—		43,803		43,803

	Total nonrecurring fair value measurements		$	—	$	72,694	$	43,803	$	116,497

Schedule of Estimated Fair Values of Financial Instruments	'
	The following tables present the estimated fair values of the Company’s financial instruments by fair value hierarchy levels and the corresponding carrying amount at September 30, 2013 and December 31, 2012 (in thousands):




			September 30, 2013
									Total		Carrying
			Level 1		Level 2		Level 3		Fair Value		Amount
	Financial assets:
	Cash, interest-bearing bank deposits, and federal funds sold		$	888,005	$	—	$	—	$	888,005	$	888,005
	Available for sale securities			9,470		1,448,650		—		1,458,120		1,458,120
	Held to maturity securities			100,688		2,553,179		—		2,653,867		2,666,082
	Loans, net			—		27,981		11,528,860		11,556,841		11,596,250
	Loans held for sale			—		18,444		—		18,444		18,444
	Accrued interest receivable			42,039		—		—		42,039		42,039
	Derivative financial instruments			—		16,062		—		16,062		16,062
	Financial liabilities:
	Deposits		$	—	$	—	$	15,017,314	$	15,017,314	$	15,054,871
	Federal funds purchased			22,193		—		—		22,193		22,193
	Securities sold under agreements to repurchase			760,586		—		—		760,586		760,586
	Long-term debt			—		384,239		—		384,239		376,664
	Accrued interest payable			5,694		—		—		5,694		5,694
	Derivative financial instruments			—		15,929		—		15,929		15,929

			December 31, 2012
									Total		Carrying
			Level 1		Level 2		Level 3		Fair Value		Amount
	Financial assets:
	Cash, interest-bearing bank deposits, and federal funds sold		$	1,948,679	$	—	$	—	$	1,948,679	$	1,948,679
	Available for sale securities			25,794		2,022,648		—		2,048,442		2,048,442
	Held to maturity securities			—		1,710,465		—		1,710,465		1,668,018
	Loans, net			—		72,694		11,494,409		11,567,103		11,441,631
	Loans held for sale			—		50,605		—		50,605		50,605
	Accrued interest receivable			45,616		—		—		45,616		45,616
	Derivative financial instruments			—		20,093		—		20,093		20,093
	Financial liabilities:
	Deposits		$	—	$	—	$	15,757,044	$	15,757,044	$	15,744,188
	Federal funds purchased			25,704		—		—		25,704		25,704
	Securities sold under agreements to repurchase			613,429		—		—		613,429		613,429
	Long-term debt			—		410,791		—		410,791		396,589
	Accrued interest payable			4,814		—		—		4,814		4,814
	Derivative financial instruments			—		21,100		—		21,100		21,100

Derivatives_Tables

Derivatives (Tables)	9 Months Ended
Derivatives (Tables)	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Notional and Fair Values of Derivative Instruments on Balance Sheet	'
	The table below presents the notional amounts and fair values (in thousands) of the Company’s derivative financial instruments as well as their classification on the consolidated balance sheets as of September 30, 2013 and December 31, 2012.
	Fair and Notional Values of Derivative Instruments


													Fair Values (1)
					Notional Amounts								Assets								Liabilities
	(in thousands)		Type of		September 30,				December 31,				September 30,				December 31,				September 30,				December 31,
	(in thousands)		Hedge		2013				2012				2013				2012				2013				2012
	Derivatives designated as hedging instruments:
	Interest rate swaps		Cash Flow		$	—			$	140,000			$	—			$	—			$	—			$	298

					$	—			$	140,000			$	—			$	—			$	—			$	298

	Derivatives not designated as hedging instruments:
	Interest rate swaps (2)		N/A		$	661,421			$	547,477			$	15,249			$	19,448			$	15,079			$	20,157
	Risk participation agreements		N/A			20,287				—				4				—				3				—
	Forward commitments to sell residential mortgage loans		N/A			24,473				115,256				51				190				355				590
	Interest rate-lock commitments on residential mortgage loans		N/A			12,814				58,135				251				455				11				55
	Foreign exchange forward contracts		N/A			33,941				—				507				—				481				—

					$	752,936			$	720,868			$	16,062			$	20,093			$	15,929			$	20,802


	-1	Derivative assets and liabilities are reported with other assets or other liabilities, respectively, in the consolidated balance sheets.
	-2	The notional amount represents both the customer accommodation agreements and offsetting agreements with unrelated financial institutions.
Offsetting Derivative Assets and Liabilities	'
	Offsetting information in regards to derivative assets and liabilities subject to master netting agreements at September 30, 2013 and December 31, 2012 is presented in the following tables (in thousands):




			Gross				Gross				Net Amounts				Gross Amounts Not Offset in the
							Amounts				Presented in				Statement of Financial Position
							Offset in the
											the Statement
							Statement
	Description		Amounts				of Financial				of Financial				Financial				Cash				Net
	Description		Recognized				Position				Position				Instruments				Collateral				Amount
	As of September 30, 2013
	Derivative Assets		$	15,253			$	—			$	15,253			$	1,949			$	—			$	13,304

	Total		$	15,253			$	—			$	15,253			$	1,949			$	—			$	13,304

	Derivative Liabilities		$	15,082			$	—			$	15,082			$	1,949			$	9,113			$	4,020

	Total		$	15,082			$	—			$	15,082			$	1,949			$	9,113			$	4,020

	As of December 31, 2012
	Derivative Assets		$	19,448			$	—			$	19,448			$	—			$	—			$	19,448

	Total		$	19,448			$	—			$	19,448			$	—			$	—			$	19,448

	Derivative Liabilities		$	20,455			$	—			$	20,455			$	—			$	16,839			$	3,616

	Total		$	20,455			$	—			$	20,455			$	—			$	16,839			$	3,616

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
Stockholders' Equity (Tables)	Sep. 30, 2013
Equity [Abstract]	'
Components of Accumulated Other Comprehensive Income (Loss)	'
	The components of AOCI and changes in those components are presented in the following table (in thousands).


			Available			HTM						Loss on
			Available			Securities						Loss on
			for Sale			Transferred			Employee			Effective Cash
			Securities			from AFS			Benefit Plans			Flow Hedges			Total
	Balance, January 1, 2012		$	60,478		$	—		$	(86,923	)	$	(65	)	$	(26,510	)

	Other comprehensive income before income taxes:
	Net change in unrealized gain (loss)			24,780			—			—			(370	)		24,410
	Transfer of net unrealized gain from AFS to HTM, net of cumulative tax effect			(24,598	)		24,598			—			—			—
	Reclassification of net (gains) losses realized and included in earnings			(929	)		—			5,260			40			4,371
	Amortization of unrealized net gain on securities transferred to HTM			—			(5,645	)		—			—			(5,645	)
	Income tax expense (benefit)			8,693			(2,122	)		1,971			(129	)		8,413

	Balance, September 30, 2012		$	51,038		$	21,075		$	(83,634	)	$	(266	)	$	(11,787	)

	Balance, January 1, 2013		$	38,854		$	19,090		$	(80,688	)	$	(181	)	$	(22,925	)

	Other comprehensive income before income taxes:
	Net change in unrealized gain (loss)			(96,070	)		—			—			(4	)		(96,074	)
	Transfer of net unrealized loss from AFS to HTM, net of cumulative tax effect			36,208			(36,208	)		—			—			—
	Reclassification of net (gains) losses realized and included in earnings			—			—			5,534			301			5,835
	Amortization/accretion of unrealized net gain/loss on securities transferred to HTM			—			(7,099	)		—			—			(7,099	)
	Income tax expense (benefit)			(35,115	)		(2,563	)		2,070			116			(35,492	)

	Balance, September 30, 2013		$	14,107		$	(21,654	)	$	(77,224	)	$	—		$	(84,771	)

Summary of Items in Consolidated Income Statements Affected by Amounts Reclassified From Accumulated Other Comprehensive Income	'
	The following table shows the line items in the consolidated income statements affected by amounts reclassified from accumulated other comprehensive income:




			Nine Months Ended						Increase (decrease) in affected
			September 30,						Increase (decrease) in affected
	Amount reclassified from AOCI (in thousands)		2013			2012			line item in the income statement
	Gains and losses on sale of AFS securities		$	—		$	929		Securities gains (losses)
	Tax effect			—			325		Income taxes

	Net of tax			—			604		Net income

	Amortization/accretion of unrealized net gain/loss on securities transferred to HTM		$	7,099		$	5,645		Interest income
	Tax effect			2,563			2,122		Income taxes

	Net of tax			4,536			3,523		Net income

	Amortization of defined benefit pension and post-retirement items		$	(5,534	)	$	(5,260	)	(a)
	Tax effect			(2,070	)		(1,971	)	Income taxes

	Net of tax			(3,464	)		(3,289	)	Net income

	Gains and losses on cash flow hedges		$	(301	)	$	(40	)	Interest expense
	Tax effect			(105	)		(14	)	Income taxes

	Net of tax			(196	)		(26	)	Net income

	Total reclassifications, net of tax		$	876		$	812		Net income



	(a)	These accumulated other comprehensive income components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see footnote 9 for additional details).

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
Earnings Per Share (Tables)	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Computation of Earnings Per Common Share	'
	Following is a summary of the information used in the computation of earnings per common share using the two-class method (in thousands, except per share amounts):




		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Numerator:
	Net income to common shareholders	$	33,202	$	46,984	$	128,640	$	104,783
	Net income allocated to participating securities — basic and diluted		616		281		2,398		844

	Net income allocated to common shareholders—basic and diluted	$	32,586	$	46,703	$	126,242	$	103,939

	Denominator:
	Weighted-average common shares—basic		82,091		84,777		83,404		84,757
	Dilutive potential common shares		114		855		92		768

	Weighted average common shares—diluted		82,205		85,632		83,496		85,525

	Earnings per common share:
	Basic	$	0.4	$	0.55	$	1.51	$	1.23
	Diluted	$	0.4	$	0.55	$	1.51	$	1.22

ShareBased_Payment_Arrangement1

Share-Based Payment Arrangements (Tables)	9 Months Ended
Share-Based Payment Arrangements (Tables)	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Schedule of Option Activity Under Stock Option Plans	'
	A summary of option activity for the nine months ended September 30, 2013 is presented below:


							Weighted-
							Average
					Weighted-		Remaining
					Average		Contractual		Aggregate
		Number of			Exercise		Term		Intrinsic
	Options	Shares			Price ($)		(Years)		Value ($000)
	Outstanding at January 1, 2013		1,555,296		$	38.57
	Exercised		(21,145	)		27.51
	Forfeited or expired		(96,226	)		45.15

	Outstanding at September 30, 2013		1,437,925		$	38.3		4.7	$	797

	Exercisable at September 30, 2013		990,202		$	41.15		3.4	$	389

Schedule of Nonvested Restricted and Performance Shares	'
	A summary of the status of the Company’s nonvested restricted and performance shares as of September 30, 2013 and changes during the nine months ended September 30, 2013, is presented below. These restricted and performance shares are subject to service requirements.


					Weighted-
					Average
		Number of			Grant-Date
		Shares			Fair Value ($)
	Nonvested at January 1, 2013		1,684,360		$	31.56
	Granted		95,586			32.03
	Vested		(38,909	)		34.52
	Forfeited		(70,884	)		31.25

	Nonvested at September 30, 2013		1,670,153		$	31.52

Retirement_Plans_Tables

Retirement Plans (Tables)	9 Months Ended
Retirement Plans (Tables)	Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'
Components of Net Periodic Benefits Cost	'
	The following table shows the components of net periodic benefits cost included in expense for the plans.


		Three Months ended September 30,
		2013			2012			2013		2012
								Other Post-
		Pension benefits						retirement Benefits
	Service cost	$	3,969		$	3,249		$	52	$	48
	Interest cost		4,151			4,301			327		361
	Expected return on plan assets		(6,982	)		(6,350	)		—		—
	Amortization of prior service cost		—			—			—		(13	)
	Amortization of net loss		1,605			1,645			459		176
	Amortization of transition obligation		—			—			—		1

	Net periodic benefit cost	$	2,743		$	2,845		$	838	$	573



		Nine Months Ended September 30,
		2013			2012			2013		2012
		Pension benefits						Other Post-
		Pension benefits						retirement Benefits
	Service cost	$	11,905		$	9,743		$	162	$	144
	Interest cost		12,457			12,904			987		1,083
	Expected return on plan assets		(20,946	)		(19,049	)		—		—
	Amortization of prior service cost		—			—			—		(41	)
	Amortization of net loss		4,813			4,936			1,320		530
	Amortization of transition obligation		—			—			—		4

	Net periodic benefit cost	$	8,229		$	8,534		$	2,469	$	1,720

Other_Noninterest_Income_Table

Other Noninterest Income (Tables)	9 Months Ended
Other Noninterest Income (Tables)	Sep. 30, 2013
Other Income And Expenses [Abstract]	'
Components of Other Noninterest Income	'
	Components of other noninterest income are as follows:




		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
		(In thousands)
	Income from bank owned life insurance	$	2,574	$	2,870	$	8,764	$	8,617
	Credit related fees		2,995		1,545		5,969		5,130
	Income from derivatives		1,257		455		3,296		2,091
	Safety deposit box income		467		502		1,480		1,524
	Gain/(loss) on sale of assets		801		2,705		1,277		2,909
	Other miscellaneous		1,432		1,693		5,863		10,830

	Total other noninterest income	$	9,526	$	9,770	$	26,649	$	31,101

Other_Noninterest_Expense_Tabl

Other Noninterest Expense (Tables)	9 Months Ended
Other Noninterest Expense (Tables)	Sep. 30, 2013
Other Income And Expenses [Abstract]	'
Components of Other Noninterest Expense	'
	Components of other noninterest expense are as follows:




		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
		(In thousands)
	Insurance expense	$	887	$	1,207	$	3,018	$	4,428
	Ad valorem and franchise taxes		2,809		2,185		7,193		6,608
	Printing and supplies		1,143		1,488		3,963		6,162
	Public relations and contributions		969		1,065		3,960		4,827
	Travel expense		1,074		1,282		3,475		4,464
	Other real estate owned expense, net		2,439		4,590		6,502		11,630
	Tax credit investment amortization		4,880		1,513		7,553		4,538
	Other miscellaneous		19,851		4,488		32,504		19,311

	Total other noninterest expense	$	34,052	$	17,818	$	68,168	$	61,968

Segment_Reporting_Tables

Segment Reporting (Tables)	9 Months Ended
Segment Reporting (Tables)	Sep. 30, 2013
Segment Reporting [Abstract]	'
Schedule of Segment Reporting Information	'
	The Company’s reportable operating segments consist of the Hancock segment, which coincides generally with the Company’s Hancock Bank subsidiary, and the Whitney segment, which coincides generally with its Whitney Bank subsidiary. Each of the bank segments offers commercial, consumer and mortgage loans and deposit services as well as certain other services, such as trust and treasury management services. Although the bank segments offer the same products and services, they are managed separately due to different pricing, product demand, and consumer markets. In addition, the “Other” column in the following tables includes activities of other consolidated subsidiaries which do not constitute reportable segments under the quantitative and aggregation accounting guidelines. These subsidiaries provide investment services, insurance agency services, and various other services to third parties.




			Three Months Ended September 30, 2013
			Hancock				Whitney				Other				Eliminations				Consolidated
	Interest income		$	66,509			$	109,909			$	6,336			$	(1,115	)		$	181,639
	Interest expense			(4,318	)			(4,583	)			(2,208	)			1,000			$	(10,109	)

	Net interest income			62,191				105,326				4,128				(115	)			171,530

	Provision for loan losses			(7,479	)			899				(989	)			—				(7,569	)
	Noninterest income			18,527				34,366				10,174				(10	)			63,057
	Depreciation and amortization			(3,983	)			(3,868	)			(306	)			—				(8,157	)
	Other noninterest expense			(65,756	)			(96,334	)			(11,968	)			10				(174,048	)

	Income before income taxes			3,500				40,389				1,039				(115	)			44,813
	Income tax expense			338				10,619				654				—				11,611

	Net income		$	3,162			$	29,770			$	385			$	(115	)		$	33,202

	Goodwill		$	94,130			$	527,063			$	4,482			$	—			$	625,675
	Total assets		$	6,513,536			$	12,620,550			$	2,747,834			$	(3,080,074	)		$	18,801,846

	Total interest income from affiliates		$	807			$	308			$	—			$	(1,115	)		$	—
	Total interest income from external customers		$	65,702			$	109,601			$	6,336			$	—			$	181,639



			Three Months Ended September 30, 2012
			Hancock				Whitney				Other				Eliminations				Consolidated
	Interest income		$	73,558			$	110,917			$	6,068			$	(1,338	)		$	189,205
	Interest expense			(5,402	)			(5,669	)			(2,100	)			1,222			$	(11,949	)

	Net interest income			68,156				105,248				3,968				(116	)			177,256

	Provision for loan losses			(4,814	)			(2,353	)			(934	)			—				(8,101	)
	Noninterest income			20,205				31,938				10,722				(23	)			62,842
	Depreciation and amortization			(3,830	)			(3,981	)			(256	)			—				(8,067	)
	Other noninterest expense			(59,821	)			(90,087	)			(11,761	)			22				(161,647	)

	Securities transactions			94				823				—				—				917

	Income before income taxes			19,990				41,588				1,739				(117	)			63,200
	Income tax expense			5,433				10,130				653				—				16,216

	Net income		$	14,556			$	31,458			$	1,086			$	(117	)		$	46,984

	Goodwill		$	94,130			$	530,265			$	4,482			$	—			$	628,877
	Total assets		$	6,390,378			$	12,343,043			$	2,737,061			$	(2,946,352	)		$	18,524,130

	Total interest income from affiliates		$	1,010			$	328			$	—			$	(1,338	)		$	—
	Total interest income from external customers		$	72,548			$	110,589			$	6,068			$	—			$	189,205



			Nine Months Ended September 30, 2013
			Hancock				Whitney				Other				Eliminations				Consolidated
	Interest income		$	198,115			$	333,322			$	18,612			$	(3,489	)		$	546,560
	Interest expense			(13,753	)			(14,162	)			(7,065	)			3,144				(31,836	)

	Net interest income			184,362				319,160				11,547				(345	)			514,724

Provision for loan losses			(15,986	)			(6,016	)			(3,402	)			—				(25,404	)
Noninterest income			56,804				97,278				33,093				(34	)			187,141
Depreciation and amortization			(11,572	)			(11,698	)			(908	)			—				(24,178	)
Other noninterest expense			(173,037	)			(269,735	)			(37,141	)			34				(479,879	)

Income before income taxes			40,571				128,989				3,189				(345	)			172,404
Income tax expense			7,521				34,133				2,110				—				43,764

Net income		$	33,050			$	94,856			$	1,079			$	(345	)		$	128,640

Goodwill		$	94,130			$	527,063			$	4,482			$	—			$	625,675
Total assets		$	6,513,536			$	12,620,550			$	2,747,834			$	(3,080,074	)		$	18,801,846

Total interest income from affiliates		$	2,741			$	748			$	—			$	(3,489	)		$	—
Total interest income from external customers		$	195,374			$	332,574			$	18,612			$	—			$	546,560

		Nine Months Ended September 30, 2012
		Hancock				Whitney				Other				Eliminations				Consolidated
Interest income		$	201,525			$	355,776			$	17,839			$	(3,730	)		$	571,410
Interest expense			(17,587	)			(19,915	)			(6,290	)			3,385				(40,407	)

Net interest income			183,938				335,861				11,549				(345	)			531,003

Provision for loan losses			(7,313	)			(18,696	)			(132	)			—				(26,141	)
Noninterest income			59,644				98,122				30,149				(27	)			187,888
Depreciation and amortization			(10,884	)			(13,596	)			(749	)			—				(25,229	)
Other noninterest expense			(174,796	)			(320,985	)			(34,166	)			27				(529,920	)
Securities transactions			98				824				7				—				929

Income before income taxes			50,687				81,530				6,658				(345	)			138,530
Income tax expense			11,808				18,938				3,001				—				33,747

Net income		$	38,879			$	62,592			$	3,657			$	(345	)		$	104,783

Goodwill		$	94,130			$	530,265			$	4,482			$	—			$	628,877
Total assets		$	6,390,378			$	12,343,043			$	2,737,061			$	(2,946,352	)		$	18,524,130

Total interest income from affiliates		$	3,033			$	697			$	—			$	(3,730	)		$	—
Total interest income from external customers		$	198,492			$	355,079			$	17,839			$	—			$	571,410

Securities_Amortized_Cost_and_

Securities - Amortized Cost and Fair Value of Available for Sale Securities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available for sale, amortized cost	$1,435,823	$1,986,882
Securities available for sale, Gross Unrealized Gains	30,191	61,599
Securities available for sale, Gross Unrealized Losses	7,894	39
Securities Available for Sale, Fair Value	1,458,120	2,048,442
US Treasury and government agency securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available for sale, amortized cost	615	18,246
Securities available for sale, Gross Unrealized Gains	6	19
Securities available for sale, Gross Unrealized Losses	1	'
Securities Available for Sale, Fair Value	620	18,265
Municipal obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available for sale, amortized cost	43,573	49,608
Securities available for sale, Gross Unrealized Gains	197	571
Securities available for sale, Gross Unrealized Losses	122	14
Securities Available for Sale, Fair Value	43,648	50,165
Mortgage-backed securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available for sale, amortized cost	1,337,251	1,715,524
Securities available for sale, Gross Unrealized Gains	29,214	58,903
Securities available for sale, Gross Unrealized Losses	6,495	21
Securities Available for Sale, Fair Value	1,359,970	1,774,406
Collateralized mortgage obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available for sale, amortized cost	46,288	196,723
Securities available for sale, Gross Unrealized Gains	'	1,354
Securities available for sale, Gross Unrealized Losses	1,256	'
Securities Available for Sale, Fair Value	45,032	198,077
Corporate debt securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available for sale, amortized cost	3,500	2,250
Securities Available for Sale, Fair Value	3,500	2,250
Other equity securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available for sale, amortized cost	4,596	4,531
Securities available for sale, Gross Unrealized Gains	774	752
Securities available for sale, Gross Unrealized Losses	20	4
Securities Available for Sale, Fair Value	$5,350	$5,279

Securities_Amortized_Cost_and_1

Securities - Amortized Cost and Fair Value of Held to Maturity Securities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]	'	'
Securities Held to Maturity, Amortized Cost	$2,666,082	$1,668,018
Securities Held to Maturity, Gross Unrealized Gains	13,713	43,388
Securities Held to Maturity, Gross Unrealized Losses	25,928	941
Securities Held to Maturity, Fair Value	2,653,867	1,710,465
US Treasury and government agency securities [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Securities Held to Maturity, Amortized Cost	100,000	'
Securities Held to Maturity, Gross Unrealized Gains	688	'
Securities Held to Maturity, Fair Value	100,688	'
Municipal obligations [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Securities Held to Maturity, Amortized Cost	195,662	164,493
Securities Held to Maturity, Gross Unrealized Gains	1,137	16,017
Securities Held to Maturity, Gross Unrealized Losses	5,291	'
Securities Held to Maturity, Fair Value	191,508	180,510
Mortgage-backed securities [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Securities Held to Maturity, Amortized Cost	995,686	180,397
Securities Held to Maturity, Gross Unrealized Gains	9,273	3,429
Securities Held to Maturity, Gross Unrealized Losses	2,118	'
Securities Held to Maturity, Fair Value	1,002,841	183,826
Collateralized mortgage obligations [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Securities Held to Maturity, Amortized Cost	1,374,734	1,323,128
Securities Held to Maturity, Gross Unrealized Gains	2,615	23,942
Securities Held to Maturity, Gross Unrealized Losses	18,519	941
Securities Held to Maturity, Fair Value	$1,358,830	$1,346,129

Securities_Additional_Informat

Securities - Additional Information (Detail) (USD $)	3 Months Ended
Securities - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]	'	'
Available for sale securities reclassified to held to maturity securities	$1,000,000,000	'
Unrealized net holding gain on the available for sale securities on the date of transfer	56,800,000	'
Gains or losses recognized as a result of transfer	0	'
Securities pledged to secure public deposits and securities sold under agreements to repurchase	$2,600,000,000	$2,600,000,000

Securities_Amortized_Cost_and_2

Securities - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Detail) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Securities Available for Sale, Due in one year or less, Amortized Cost	$23,895
Securities Available for Sale, Due after one year through five years, Amortized Cost	130,419
Securities Available for Sale, Due after five years through ten years, Amortized Cost	154,962
Securities Available for Sale, Due after ten years, Amortized Cost	1,121,951
Total available for sale securities, Amortized Cost	1,431,227
Securities Available for Sale, Due in one year or less, Fair Value	24,010
Securities Available for Sale, Due after one year through five years, Fair Value	130,124
Securities Available for Sale, Due after five years through ten years, Fair Value	161,485
Securities Available for Sale, Due after ten years, Fair Value	1,137,151
Total available for sale securities, Fair Value	$1,452,770

Securities_Amortized_Cost_and_3

Securities - Amortized Cost and Fair Value of Held to Maturity Securities by Contractual Maturity (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]	'	'
Securities Held to Maturity, Due in one year or less, Amortized Cost	$107,697	'
Securities Held to Maturity, Due after one year through five years, Amortized Cost	669,896	'
Securities Held to Maturity, Due after five years through ten years, Amortized Cost	121,588	'
Securities Held to Maturity, Due after ten years, Amortized Cost	1,766,901	'
Total Held to Maturity securities, Amortized Cost	2,666,082	1,668,018
Securities Held to Maturity, Due in one year or less, Fair Value	108,407	'
Securities Held to Maturity, Due after one year through five years, Fair Value	655,554	'
Securities Held to Maturity, Due after five years through ten years, Fair Value	117,864	'
Securities Held to Maturity, Due after ten years, Fair Value	1,772,042	'
Total Held to Maturity Securities, Fair Value	$2,653,867	$1,710,465

Securities_Available_for_Sale_

Securities - Available for Sale Securities Unrealized Losses (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]	'	'
Available for sale securities, Losses less than 12 months, Fair Value	$206,828	$63,298
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	7,885	30
Available for sale securities, Losses 12 months or longer, Fair value	485	1,099
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	9	9
Available for sale securities, Total, Fair value	207,313	64,397
Available for sale securities, Total, Gross Unrealized Losses	7,894	39
US Treasury and government agency securities [Member]	'	'
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]	'	'
Available for sale securities, Losses 12 months or longer, Fair value	104	'
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	1	'
Available for sale securities, Total, Fair value	104	'
Available for sale securities, Total, Gross Unrealized Losses	1	'
Municipal obligations [Member]	'	'
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]	'	'
Available for sale securities, Losses less than 12 months, Fair Value	13,647	5,278
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	122	14
Available for sale securities, Total, Fair value	13,647	5,278
Available for sale securities, Total, Gross Unrealized Losses	122	14
Mortgage-backed securities [Member]	'	'
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]	'	'
Available for sale securities, Losses less than 12 months, Fair Value	144,859	57,752
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	6,488	14
Available for sale securities, Losses 12 months or longer, Fair value	379	1,097
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	7	7
Available for sale securities, Total, Fair value	145,238	58,849
Available for sale securities, Total, Gross Unrealized Losses	6,495	21
Collateralized mortgage obligations [Member]	'	'
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]	'	'
Available for sale securities, Losses less than 12 months, Fair Value	45,032	'
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	1,256	'
Available for sale securities, Total, Fair value	45,032	'
Available for sale securities, Total, Gross Unrealized Losses	1,256	'
Equity securities [Member]	'	'
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]	'	'
Available for sale securities, Losses less than 12 months, Fair Value	3,290	268
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	19	2
Available for sale securities, Losses 12 months or longer, Fair value	2	2
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	1	2
Available for sale securities, Total, Fair value	3,292	270
Available for sale securities, Total, Gross Unrealized Losses	$20	$4

Securities_Held_to_Maturity_wi

Securities - Held to Maturity with Unrealized Losses (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held to maturity securities, Losses less than 12 months, Fair Value	$983,077	$87,852
Held to maturity securities, Losses Less than 12 months, Gross Unrealized Losses	24,747	259
Held to maturity securities, Losses 12 months or longer, Fair value	282,108	54,445
Held to maturity securities, Losses 12 months or longer, Gross Unrealized Losses	1,181	682
Held to maturity securities, Total, Fair value	1,265,185	142,297
Held to maturity securities, Total, Gross Unrealized Losses	25,928	941
Municipal obligations [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held to maturity securities, Losses less than 12 months, Fair Value	115,901	'
Held to maturity securities, Losses Less than 12 months, Gross Unrealized Losses	5,252	'
Held to maturity securities, Losses 12 months or longer, Fair value	1,253	'
Held to maturity securities, Losses 12 months or longer, Gross Unrealized Losses	39	'
Held to maturity securities, Total, Fair value	117,154	'
Held to maturity securities, Total, Gross Unrealized Losses	5,291	'
Mortgage-backed securities [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held to maturity securities, Losses less than 12 months, Fair Value	147,019	'
Held to maturity securities, Losses Less than 12 months, Gross Unrealized Losses	2,118	'
Held to maturity securities, Total, Fair value	147,019	'
Held to maturity securities, Total, Gross Unrealized Losses	2,118	'
Collateralized mortgage obligations [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held to maturity securities, Losses less than 12 months, Fair Value	720,157	87,852
Held to maturity securities, Losses Less than 12 months, Gross Unrealized Losses	17,377	259
Held to maturity securities, Losses 12 months or longer, Fair value	280,855	54,445
Held to maturity securities, Losses 12 months or longer, Gross Unrealized Losses	1,142	682
Held to maturity securities, Total, Fair value	1,001,012	142,297
Held to maturity securities, Total, Gross Unrealized Losses	$18,519	$941

Loans_and_Allowance_for_Loan_L2

Loans and Allowance for Loan Losses - Loans, Net of Unearned Income (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Loans Receivable [Line Items]	'	'
Total covered loans	$392,002	$515,823
Total loans	11,734,472	11,577,802
Commercial Non-Real Estate [Member]	'	'
Loans Receivable [Line Items]	'	'
Total covered loans	24,340	29,260
Total loans	4,625,315	4,433,288
Construction and Land Development [Member]	'	'
Loans Receivable [Line Items]	'	'
Total covered loans	23,197	28,482
Total loans	920,408	989,306
Commercial Real Estate [Member]	'	'
Loans Receivable [Line Items]	'	'
Total covered loans	60,280	95,146
Total loans	2,914,969	2,923,094
Residential Mortgage Loans [Member]	'	'
Loans Receivable [Line Items]	'	'
Total covered loans	223,494	263,515
Total loans	1,695,197	1,577,944
Consumer loans [Member]	'	'
Loans Receivable [Line Items]	'	'
Total covered loans	60,691	99,420
Total loans	1,578,583	1,654,170
Originated loans [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered	8,700,767	7,107,221
Originated loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered-Commercial non-real estate	3,633,490	2,713,385
Originated loans [Member] \| Construction and Land Development [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered-Construction and land development	738,983	665,673
Originated loans [Member] \| Commercial Real Estate [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered-Commercial real estate	1,816,402	1,548,402
Originated loans [Member] \| Residential Mortgage Loans [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered-Residential mortgages	1,124,649	827,985
Originated loans [Member] \| Consumer loans [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered-Consumer	1,387,243	1,351,776
Acquired loans [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered	2,641,703	3,954,758
Acquired loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered-Commercial non-real estate	967,485	1,690,643
Acquired loans [Member] \| Construction and Land Development [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered-Construction and land development	158,228	295,151
Acquired loans [Member] \| Commercial Real Estate [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered-Commercial real estate	1,038,287	1,279,546
Acquired loans [Member] \| Residential Mortgage Loans [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered-Residential mortgages	347,054	486,444
Acquired loans [Member] \| Consumer loans [Member]	'	'
Loans Receivable [Line Items]	'	'
Total-excluding covered-Consumer	$130,649	$202,974

Loans_and_Allowance_for_Loan_L3

Loans and Allowance for Loan Losses - Schedule of Activity in Loss Share Receivable (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Receivables [Abstract]	'	'
Balance, January 1	$177,844	$231,085
Accretion (amortization)	-590	5,000
Charge-offs, write-downs and other losses	-190	36,685
External expenses qualifying under loss share agreement	7,918	7,422
Payments received from the FDIC	-60,886	-84,130
Ending balance	$124,096	$196,062

Loans_and_Allowance_for_Loan_L4

Loans and Allowance for Loan Losses - Allowance for Loan Losses by Portfolio Segment and Related Recorded Investment in Loans (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	$136,171	'	'
Loans and Leases receivable, Allowance, Ending Balance	11,734,472	'	11,734,472	'	11,577,802
Net provision for loan losses	7,569	8,101	25,404	26,141	'
Loans and Leases receivable, Allowance, Ending Balance	138,223	'	138,223	'	'
Commercial Non-Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	4,625,315	'	4,625,315	'	4,433,288
Construction and Land Development [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	920,408	'	920,408	'	989,306
Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	2,914,969	'	2,914,969	'	2,923,094
Residential Mortgage Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	1,695,197	'	1,695,197	'	1,577,944
Consumer loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	1,578,583	'	1,578,583	'	1,654,170
Commercial loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	'	'	'	'	8,345,688
Allowance for loan losses [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	136,171	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	'	124,881	'
Charge-offs	'	'	-40,259	-57,427	'
Recoveries	'	'	15,410	7,595	'
Net provision for loan losses	'	'	-25,404	-26,141	'
Increase in FDIC loss share receivable	'	'	1,497	34,401	'
Loans and Leases receivable, Allowance, Ending Balance	138,223	'	138,223	'	'
Loans and Leases receivable, Allowance, Ending Balance	'	135,591	'	135,591	'
Ending balance: Individually evaluated for impairment	1,945	8,602	1,945	8,602	'
Ending balance: Collectively evaluated for impairment	75,939	71,147	75,939	71,147	'
Acquired-impaired	60,339	55,842	60,339	55,842	'
Allowance for loan losses [Member] \| Commercial Non-Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	23,725	'	'
Charge-offs	'	'	-5,880	'	'
Recoveries	'	'	3,471	'	'
Net provision for loan losses	'	'	-10,036	'	'
Increase in FDIC loss share receivable	'	'	447	'	'
Loans and Leases receivable, Allowance, Ending Balance	31,799	'	31,799	'	'
Ending balance: Individually evaluated for impairment	325	'	325	'	'
Ending balance: Collectively evaluated for impairment	29,784	'	29,784	'	'
Acquired-impaired	1,690	'	1,690	'	'
Allowance for loan losses [Member] \| Construction and Land Development [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	17,038	'	'
Charge-offs	'	'	-9,332	'	'
Recoveries	'	'	1,797	'	'
Net provision for loan losses	'	'	-472	'	'
Increase in FDIC loss share receivable	'	'	-314	'	'
Loans and Leases receivable, Allowance, Ending Balance	9,661	'	9,661	'	'
Ending balance: Individually evaluated for impairment	211	'	211	'	'
Ending balance: Collectively evaluated for impairment	6,971	'	6,971	'	'
Acquired-impaired	2,479	'	2,479	'	'
Allowance for loan losses [Member] \| Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	36,392	'	'
Charge-offs	'	'	-8,034	'	'
Recoveries	'	'	4,735	'	'
Net provision for loan losses	'	'	2,038	'	'
Increase in FDIC loss share receivable	'	'	-732	'	'
Loans and Leases receivable, Allowance, Ending Balance	30,323	'	30,323	'	'
Ending balance: Individually evaluated for impairment	1,409	'	1,409	'	'
Ending balance: Collectively evaluated for impairment	20,937	'	20,937	'	'
Acquired-impaired	7,977	'	7,977	'	'
Allowance for loan losses [Member] \| Residential Mortgage Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	36,877	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	'	13,918	'
Charge-offs	'	'	-2,496	-4,889	'
Recoveries	'	'	1,004	310	'
Net provision for loan losses	'	'	-4,787	-6,532	'
Increase in FDIC loss share receivable	'	'	1,261	11,189	'
Loans and Leases receivable, Allowance, Ending Balance	41,433	'	41,433	'	'
Loans and Leases receivable, Allowance, Ending Balance	'	27,060	'	27,060	'
Ending balance: Individually evaluated for impairment	'	133	'	133	'
Ending balance: Collectively evaluated for impairment	5,912	4,518	5,912	4,518	'
Acquired-impaired	35,521	22,409	35,521	22,409	'
Allowance for loan losses [Member] \| Consumer loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	22,139	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	'	32,549	'
Charge-offs	'	'	-14,517	-11,663	'
Recoveries	'	'	4,403	3,060	'
Net provision for loan losses	'	'	-12,147	5,753	'
Increase in FDIC loss share receivable	'	'	835	562	'
Loans and Leases receivable, Allowance, Ending Balance	25,007	'	25,007	'	'
Loans and Leases receivable, Allowance, Ending Balance	'	18,755	'	18,755	'
Ending balance: Collectively evaluated for impairment	12,335	16,080	12,335	16,080	'
Acquired-impaired	12,672	2,675	12,672	2,675	'
Allowance for loan losses [Member] \| Commercial loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	'	78,414	'
Charge-offs	'	'	'	-40,875	'
Recoveries	'	'	'	4,225	'
Net provision for loan losses	'	'	'	-25,362	'
Increase in FDIC loss share receivable	'	'	'	22,650	'
Loans and Leases receivable, Allowance, Ending Balance	'	89,776	'	89,776	'
Ending balance: Individually evaluated for impairment	'	8,469	'	8,469	'
Ending balance: Collectively evaluated for impairment	'	50,549	'	50,549	'
Acquired-impaired	'	30,758	'	30,758	'
Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	11,734,472	11,434,448	11,734,472	11,434,448	'
Ending balance: Individually evaluated for impairment	51,907	85,861	51,907	85,861	'
Ending balance: Collectively evaluated for impairment	11,225,592	10,595,864	11,225,592	10,595,864	'
Acquired-impaired	456,973	752,723	456,973	752,723	'
Loans [Member] \| Commercial Non-Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	4,625,315	'	4,625,315	'	'
Ending balance: Individually evaluated for impairment	11,090	'	11,090	'	'
Ending balance: Collectively evaluated for impairment	4,570,918	'	4,570,918	'	'
Acquired-impaired	43,307	'	43,307	'	'
Loans [Member] \| Construction and Land Development [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	920,408	'	920,408	'	'
Ending balance: Individually evaluated for impairment	16,774	'	16,774	'	'
Ending balance: Collectively evaluated for impairment	865,357	'	865,357	'	'
Acquired-impaired	38,277	'	38,277	'	'
Loans [Member] \| Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	2,914,969	'	2,914,969	'	'
Ending balance: Individually evaluated for impairment	23,541	'	23,541	'	'
Ending balance: Collectively evaluated for impairment	2,805,716	'	2,805,716	'	'
Acquired-impaired	85,712	'	85,712	'	'
Loans [Member] \| Residential Mortgage Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	1,695,197	1,561,640	1,695,197	1,561,640	'
Ending balance: Individually evaluated for impairment	502	7,524	502	7,524	'
Ending balance: Collectively evaluated for impairment	1,465,814	1,259,767	1,465,814	1,259,767	'
Acquired-impaired	228,881	294,349	228,881	294,349	'
Loans [Member] \| Consumer loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	1,578,583	1,685,339	1,578,583	1,685,339	'
Ending balance: Collectively evaluated for impairment	1,517,787	1,577,265	1,517,787	1,577,265	'
Acquired-impaired	60,796	108,074	60,796	108,074	'
Loans [Member] \| Commercial loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	'	8,187,469	'	8,187,469	'
Ending balance: Individually evaluated for impairment	'	78,337	'	78,337	'
Ending balance: Collectively evaluated for impairment	'	7,758,832	'	7,758,832	'
Acquired-impaired	'	350,300	'	350,300	'
Covered loans [Member] \| Allowance for loan losses [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	56,609	41,635	'
Charge-offs	'	'	-8,873	-22,839	'
Recoveries	'	'	3,119	'	'
Net provision for loan losses	'	'	7,987	2,645	'
Increase in FDIC loss share receivable	'	'	1,497	34,401	'
Loans and Leases receivable, Allowance, Ending Balance	60,339	55,842	60,339	55,842	'
Ending balance: Individually evaluated for impairment	'	'	'	'	'
Acquired-impaired	60,339	55,842	60,339	55,842	'
Covered loans [Member] \| Allowance for loan losses [Member] \| Commercial Non-Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	2,162	'	'
Charge-offs	'	'	-681	'	'
Recoveries	'	'	90	'	'
Net provision for loan losses	'	'	-328	'	'
Increase in FDIC loss share receivable	'	'	447	'	'
Loans and Leases receivable, Allowance, Ending Balance	1,690	'	1,690	'	'
Acquired-impaired	1,690	'	1,690	'	'
Covered loans [Member] \| Allowance for loan losses [Member] \| Construction and Land Development [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	5,623	'	'
Charge-offs	'	'	-1,784	'	'
Recoveries	'	'	554	'	'
Net provision for loan losses	'	'	-1,600	'	'
Increase in FDIC loss share receivable	'	'	-314	'	'
Loans and Leases receivable, Allowance, Ending Balance	2,479	'	2,479	'	'
Acquired-impaired	2,479	'	2,479	'	'
Covered loans [Member] \| Allowance for loan losses [Member] \| Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	9,433	'	'
Charge-offs	'	'	-4,316	'	'
Recoveries	'	'	2,395	'	'
Net provision for loan losses	'	'	1,197	'	'
Increase in FDIC loss share receivable	'	'	-732	'	'
Loans and Leases receivable, Allowance, Ending Balance	7,977	'	7,977	'	'
Acquired-impaired	7,977	'	7,977	'	'
Covered loans [Member] \| Allowance for loan losses [Member] \| Residential Mortgage Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	30,471	9,024	'
Charge-offs	'	'	-947	'	'
Recoveries	'	'	13	'	'
Net provision for loan losses	'	'	4,723	2,196	'
Increase in FDIC loss share receivable	'	'	1,261	11,189	'
Loans and Leases receivable, Allowance, Ending Balance	35,521	22,409	35,521	22,409	'
Ending balance: Individually evaluated for impairment	'	'	'	'	'
Acquired-impaired	35,521	22,409	35,521	22,409	'
Covered loans [Member] \| Allowance for loan losses [Member] \| Consumer loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	8,920	14,408	'
Charge-offs	'	'	-1,145	'	'
Recoveries	'	'	67	'	'
Net provision for loan losses	'	'	3,995	-12,295	'
Increase in FDIC loss share receivable	'	'	835	562	'
Loans and Leases receivable, Allowance, Ending Balance	12,672	2,675	12,672	2,675	'
Ending balance: Individually evaluated for impairment	'	'	'	'	'
Acquired-impaired	12,672	2,675	12,672	2,675	'
Covered loans [Member] \| Allowance for loan losses [Member] \| Commercial loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	'	18,203	'
Charge-offs	'	'	'	-22,839	'
Recoveries	'	'	'	'	'
Net provision for loan losses	'	'	'	12,744	'
Increase in FDIC loss share receivable	'	'	'	22,650	'
Loans and Leases receivable, Allowance, Ending Balance	'	30,758	'	30,758	'
Ending balance: Individually evaluated for impairment	'	'	'	'	'
Acquired-impaired	'	30,758	'	30,758	'
Covered loans [Member] \| Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	392,002	555,732	392,002	555,732	'
Acquired-impaired	392,002	'	392,002	'	'
Acquired-impaired	'	555,732	'	555,732	'
Covered loans [Member] \| Loans [Member] \| Commercial Non-Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	24,340	'	24,340	'	'
Acquired-impaired	24,340	'	24,340	'	'
Covered loans [Member] \| Loans [Member] \| Construction and Land Development [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	23,197	'	23,197	'	'
Acquired-impaired	23,197	'	23,197	'	'
Covered loans [Member] \| Loans [Member] \| Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	60,280	'	60,280	'	'
Acquired-impaired	60,280	'	60,280	'	'
Covered loans [Member] \| Loans [Member] \| Residential Mortgage Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	223,494	271,618	223,494	271,618	'
Acquired-impaired	223,494	'	223,494	'	'
Acquired-impaired	'	271,618	'	271,618	'
Covered loans [Member] \| Loans [Member] \| Consumer loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	60,691	107,390	60,691	107,390	'
Acquired-impaired	60,691	'	60,691	'	'
Acquired-impaired	'	107,390	'	107,390	'
Covered loans [Member] \| Loans [Member] \| Commercial loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	'	176,724	'	176,724	'
Acquired-impaired	'	176,724	'	176,724	'
Originated loans [Member] \| Allowance for loan losses [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	78,774	83,246	'
Charge-offs	'	'	-31,386	-34,588	'
Recoveries	'	'	12,291	7,595	'
Net provision for loan losses	'	'	-17,742	-23,496	'
Loans and Leases receivable, Allowance, Ending Balance	77,421	79,749	77,421	79,749	'
Ending balance: Individually evaluated for impairment	1,482	8,602	1,482	8,602	'
Ending balance: Collectively evaluated for impairment	75,939	71,147	75,939	71,147	'
Originated loans [Member] \| Allowance for loan losses [Member] \| Commercial Non-Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	20,775	'	'
Charge-offs	'	'	-5,199	'	'
Recoveries	'	'	3,381	'	'
Net provision for loan losses	'	'	-11,152	'	'
Loans and Leases receivable, Allowance, Ending Balance	30,109	'	30,109	'	'
Ending balance: Individually evaluated for impairment	325	'	325	'	'
Ending balance: Collectively evaluated for impairment	29,784	'	29,784	'	'
Originated loans [Member] \| Allowance for loan losses [Member] \| Construction and Land Development [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	11,415	'	'
Charge-offs	'	'	-7,548	'	'
Recoveries	'	'	1,243	'	'
Net provision for loan losses	'	'	-2,072	'	'
Loans and Leases receivable, Allowance, Ending Balance	7,182	'	7,182	'	'
Ending balance: Individually evaluated for impairment	211	'	211	'	'
Ending balance: Collectively evaluated for impairment	6,971	'	6,971	'	'
Originated loans [Member] \| Allowance for loan losses [Member] \| Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	26,959	'	'
Charge-offs	'	'	-3,718	'	'
Recoveries	'	'	2,340	'	'
Net provision for loan losses	'	'	3,698	'	'
Loans and Leases receivable, Allowance, Ending Balance	21,883	'	21,883	'	'
Ending balance: Individually evaluated for impairment	946	'	946	'	'
Ending balance: Collectively evaluated for impairment	20,937	'	20,937	'	'
Originated loans [Member] \| Allowance for loan losses [Member] \| Residential Mortgage Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	6,406	4,894	'
Charge-offs	'	'	-1,549	-4,889	'
Recoveries	'	'	991	310	'
Net provision for loan losses	'	'	-64	-4,336	'
Loans and Leases receivable, Allowance, Ending Balance	5,912	4,651	5,912	4,651	'
Ending balance: Individually evaluated for impairment	'	133	'	133	'
Ending balance: Collectively evaluated for impairment	5,912	4,518	5,912	4,518	'
Originated loans [Member] \| Allowance for loan losses [Member] \| Consumer loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	13,219	18,141	'
Charge-offs	'	'	-13,372	-11,663	'
Recoveries	'	'	4,336	3,060	'
Net provision for loan losses	'	'	-8,152	-6,542	'
Loans and Leases receivable, Allowance, Ending Balance	12,335	16,080	12,335	16,080	'
Ending balance: Collectively evaluated for impairment	12,335	16,080	12,335	16,080	'
Originated loans [Member] \| Allowance for loan losses [Member] \| Commercial loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	'	60,211	'
Charge-offs	'	'	'	-18,036	'
Recoveries	'	'	'	4,225	'
Net provision for loan losses	'	'	'	-12,618	'
Loans and Leases receivable, Allowance, Ending Balance	'	59,018	'	59,018	'
Ending balance: Individually evaluated for impairment	'	8,469	'	8,469	'
Ending balance: Collectively evaluated for impairment	'	50,549	'	50,549	'
Originated loans [Member] \| Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	8,700,767	6,581,194	8,700,767	6,581,194	'
Ending balance: Individually evaluated for impairment	46,125	85,861	46,125	85,861	'
Ending balance: Collectively evaluated for impairment	8,654,642	6,495,333	8,654,642	6,495,333	'
Originated loans [Member] \| Loans [Member] \| Commercial Non-Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	3,633,490	'	3,633,490	'	'
Ending balance: Individually evaluated for impairment	8,911	'	8,911	'	'
Ending balance: Collectively evaluated for impairment	3,624,579	'	3,624,579	'	'
Originated loans [Member] \| Loans [Member] \| Construction and Land Development [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	738,983	'	738,983	'	'
Ending balance: Individually evaluated for impairment	16,044	'	16,044	'	'
Ending balance: Collectively evaluated for impairment	722,939	'	722,939	'	'
Originated loans [Member] \| Loans [Member] \| Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	1,816,402	'	1,816,402	'	'
Ending balance: Individually evaluated for impairment	21,170	'	21,170	'	'
Ending balance: Collectively evaluated for impairment	1,795,232	'	1,795,232	'	'
Originated loans [Member] \| Loans [Member] \| Residential Mortgage Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	1,124,649	757,471	1,124,649	757,471	'
Ending balance: Individually evaluated for impairment	'	7,524	'	7,524	'
Ending balance: Collectively evaluated for impairment	1,124,649	749,947	1,124,649	749,947	'
Originated loans [Member] \| Loans [Member] \| Consumer loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	1,387,243	1,357,987	1,387,243	1,357,987	'
Ending balance: Collectively evaluated for impairment	1,387,243	1,357,987	1,387,243	1,357,987	'
Originated loans [Member] \| Loans [Member] \| Commercial loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	'	4,465,736	'	4,465,736	'
Ending balance: Individually evaluated for impairment	'	78,337	'	78,337	'
Ending balance: Collectively evaluated for impairment	'	4,387,399	'	4,387,399	'
Acquired loans [Member] \| Allowance for loan losses [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	788	'	'
Net provision for loan losses	'	'	325	'	'
Loans and Leases receivable, Allowance, Ending Balance	463	'	463	'	'
Ending balance: Individually evaluated for impairment	463	'	463	'	'
Acquired loans [Member] \| Allowance for loan losses [Member] \| Commercial Non-Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Beginning Balance	'	'	788	'	'
Net provision for loan losses	'	'	788	'	'
Acquired loans [Member] \| Allowance for loan losses [Member] \| Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Net provision for loan losses	'	'	-463	'	'
Loans and Leases receivable, Allowance, Ending Balance	463	'	463	'	'
Ending balance: Individually evaluated for impairment	463	'	463	'	'
Acquired loans [Member] \| Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	2,641,703	'	2,641,703	'	'
Ending balance: Individually evaluated for impairment	5,782	'	5,782	'	'
Ending balance: Collectively evaluated for impairment	2,570,950	'	2,570,950	'	'
Acquired-impaired	64,971	'	64,971	'	'
Acquired loans [Member] \| Loans [Member] \| Commercial Non-Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	967,485	'	967,485	'	'
Ending balance: Individually evaluated for impairment	2,179	'	2,179	'	'
Ending balance: Collectively evaluated for impairment	946,339	'	946,339	'	'
Acquired-impaired	18,967	'	18,967	'	'
Acquired loans [Member] \| Loans [Member] \| Construction and Land Development [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	158,228	'	158,228	'	'
Ending balance: Individually evaluated for impairment	730	'	730	'	'
Ending balance: Collectively evaluated for impairment	142,418	'	142,418	'	'
Acquired-impaired	15,080	'	15,080	'	'
Acquired loans [Member] \| Loans [Member] \| Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	1,038,287	'	1,038,287	'	'
Ending balance: Individually evaluated for impairment	2,371	'	2,371	'	'
Ending balance: Collectively evaluated for impairment	1,010,484	'	1,010,484	'	'
Acquired-impaired	25,432	'	25,432	'	'
Acquired loans [Member] \| Loans [Member] \| Residential Mortgage Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	347,054	'	347,054	'	'
Ending balance: Individually evaluated for impairment	502	'	502	'	'
Ending balance: Collectively evaluated for impairment	341,165	'	341,165	'	'
Acquired-impaired	5,387	'	5,387	'	'
Acquired loans [Member] \| Loans [Member] \| Consumer loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans and Leases receivable, Allowance, Ending Balance	130,649	'	130,649	'	'
Ending balance: Collectively evaluated for impairment	130,544	'	130,544	'	'
Acquired-impaired	$105	'	$105	'	'

Loans_and_Allowance_for_Loan_L5

Loans and Allowance for Loan Losses - Allowance for Loan Losses by Portfolio Segment and Related Recorded Investment in Loans (Parenthetical) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Provision expense for impairment covered loans	$7,569	$8,101	$25,404	$26,141
Allowance for loan losses [Member]	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Provision expense for impairment covered loans	'	'	-25,404	-26,141
Allowance for loan losses [Member] \| Covered loans [Member]	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Provision expense for impairment covered loans	'	'	$7,987	$2,645

Loans_and_Allowance_for_Loan_L6

Loans and Allowance for Loan Losses - Summary of Composition of Non-Accrual Loans by Portfolio Segment (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	$119,708	$137,615
Commercial Non-Real Estate [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	17,502	23,267
Construction and Land Development [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	24,466	41,231
Commercial Real Estate [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	46,997	48,019
Residential Mortgage Loans [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	23,754	18,649
Consumer loans [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	6,989	6,449
Originated loans [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	91,462	103,428
Originated loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	14,118	18,941
Originated loans [Member] \| Construction and Land Development [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	19,817	32,777
Originated loans [Member] \| Commercial Real Estate [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	39,695	40,190
Originated loans [Member] \| Residential Mortgage Loans [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	13,148	7,705
Originated loans [Member] \| Consumer loans [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	4,684	3,815
Acquired loans [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	23,083	30,087
Acquired loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	3,381	4,326
Acquired loans [Member] \| Construction and Land Development [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	2,025	5,967
Acquired loans [Member] \| Commercial Real Estate [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	6,123	6,609
Acquired loans [Member] \| Residential Mortgage Loans [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	9,664	10,551
Acquired loans [Member] \| Consumer loans [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	1,890	2,634
Covered loans [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	5,163	4,100
Covered loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	3	'
Covered loans [Member] \| Construction and Land Development [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	2,624	2,487
Covered loans [Member] \| Commercial Real Estate [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	1,179	1,220
Covered loans [Member] \| Residential Mortgage Loans [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	942	393
Covered loans [Member] \| Consumer loans [Member]	'	'
Nonaccrual Loans By Portfolio [Line Items]	'	'
Non-Accrual Loans	$415	'

Loans_and_Allowance_for_Loan_L7

Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Non Accrual Loans Segregated By Class Of Loans [Line Items]	'	'
Interest that would have been recognized on nonaccrual loans	$4,900,000	'
Interest recovered on nonaccrual loans	4,100,000	'
Non-Accrual Loans	119,708,000	137,615,000
Troubled Debt Restructuring	29,700,000	32,200,000
Minimum Bank Portfolio loan need to be reviewed	1,000,000	'
Restructured Commercial Loan [Member]	'	'
Non Accrual Loans Segregated By Class Of Loans [Line Items]	'	'
Non-Accrual Loans	$19,100,000	'

Loans_and_Allowance_for_Loan_L8

Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings Occurred During Period by Portfolio Segment (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
	Contract	Contract
Troubled Debt Restructurings [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	8	12
Pre-Modification Outstanding Recorded Investment	$3,740	$10,976
Post-Modification Outstanding Recorded Investment	3,502	9,933
Troubled Debt Restructurings [Member] \| Commercial Non-Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	1	1
Pre-Modification Outstanding Recorded Investment	926	790
Post-Modification Outstanding Recorded Investment	913	790
Troubled Debt Restructurings [Member] \| Construction and Land Development [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Commercial Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	5	9
Pre-Modification Outstanding Recorded Investment	1,844	9,475
Post-Modification Outstanding Recorded Investment	1,746	8,582
Troubled Debt Restructurings [Member] \| Residential Mortgage Loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	2	2
Pre-Modification Outstanding Recorded Investment	970	711
Post-Modification Outstanding Recorded Investment	843	561
Troubled Debt Restructurings [Member] \| Consumer loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Originated loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	6	12
Pre-Modification Outstanding Recorded Investment	2,714	10,976
Post-Modification Outstanding Recorded Investment	2,526	9,933
Troubled Debt Restructurings [Member] \| Originated loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	1	1
Pre-Modification Outstanding Recorded Investment	926	790
Post-Modification Outstanding Recorded Investment	913	790
Troubled Debt Restructurings [Member] \| Originated loans [Member] \| Construction and Land Development [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Originated loans [Member] \| Commercial Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	4	9
Pre-Modification Outstanding Recorded Investment	1,332	9,475
Post-Modification Outstanding Recorded Investment	1,270	8,582
Troubled Debt Restructurings [Member] \| Originated loans [Member] \| Residential Mortgage Loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	1	2
Pre-Modification Outstanding Recorded Investment	456	711
Post-Modification Outstanding Recorded Investment	343	561
Troubled Debt Restructurings [Member] \| Originated loans [Member] \| Consumer loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Acquired loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	2	'
Pre-Modification Outstanding Recorded Investment	1,026	'
Post-Modification Outstanding Recorded Investment	976	'
Troubled Debt Restructurings [Member] \| Acquired loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Acquired loans [Member] \| Construction and Land Development [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Acquired loans [Member] \| Commercial Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	1	'
Pre-Modification Outstanding Recorded Investment	512	'
Post-Modification Outstanding Recorded Investment	476	'
Troubled Debt Restructurings [Member] \| Acquired loans [Member] \| Residential Mortgage Loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	1	'
Pre-Modification Outstanding Recorded Investment	514	'
Post-Modification Outstanding Recorded Investment	500	'
Troubled Debt Restructurings [Member] \| Acquired loans [Member] \| Consumer loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Covered loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Covered loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Covered loans [Member] \| Construction and Land Development [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Covered loans [Member] \| Commercial Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Covered loans [Member] \| Residential Mortgage Loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings [Member] \| Covered loans [Member] \| Consumer loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Pre-Modification Outstanding Recorded Investment	'	'
Post-Modification Outstanding Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	2
Recorded Investment	'	1,787
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Commercial Non-Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Construction and Land Development [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Commercial Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	2
Recorded Investment	'	1,787
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Residential Mortgage Loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Consumer loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Originated loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	2
Recorded Investment	'	1,787
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Originated loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Originated loans [Member] \| Construction and Land Development [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Originated loans [Member] \| Commercial Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	2
Recorded Investment	'	1,787
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Originated loans [Member] \| Residential Mortgage Loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Originated loans [Member] \| Consumer loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Acquired loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Acquired loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Acquired loans [Member] \| Construction and Land Development [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Acquired loans [Member] \| Commercial Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Acquired loans [Member] \| Residential Mortgage Loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Acquired loans [Member] \| Consumer loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Covered loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Covered loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Covered loans [Member] \| Construction and Land Development [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Covered loans [Member] \| Commercial Real Estate [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Covered loans [Member] \| Residential Mortgage Loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Troubled Debt Restructurings That Subsequently Defaulted [Member] \| Covered loans [Member] \| Consumer loans [Member]	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'

Loans_and_Allowance_for_Loan_L9

Loans and Allowance for Loan Losses - Summary of Impaired Loans Disaggregated by Class (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	$21,141	$41,526
Recorded Investment, With a related allowance recorded	30,766	42,052
Recorded Investment, Total	51,907	83,578
Unpaid Principal Balance, With no related allowance recorded	24,869	70,970
Unpaid Principal Balance, With a related allowance recorded	31,408	44,303
Unpaid Principal Balance, Total	56,277	115,273
Related Allowance, Total	1,945	7,165
Average Recorded Investment, With no related allowance recorded	24,973	33,502
Average Recorded Investment, With a related allowance recorded	43,349	47,402
Average Recorded Investment, Total	68,322	80,904
Interest Income Recognized, With no related allowance recorded	456	619
Interest Income Recognized, With a related allowance recorded	683	703
Interest Income Recognized, Total	1,139	1,322
Commercial Non-Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	3,027	'
Recorded Investment, With a related allowance recorded	8,063	'
Recorded Investment, Total	11,090	'
Unpaid Principal Balance, With no related allowance recorded	3,259	'
Unpaid Principal Balance, With a related allowance recorded	8,365	'
Unpaid Principal Balance, Total	11,624	'
Related Allowance, Total	325	'
Average Recorded Investment, With no related allowance recorded	757	'
Average Recorded Investment, With a related allowance recorded	13,363	'
Average Recorded Investment, Total	14,120	'
Interest Income Recognized, With no related allowance recorded	12	'
Interest Income Recognized, With a related allowance recorded	230	'
Interest Income Recognized, Total	242	'
Construction and Land Development [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	10,528	'
Recorded Investment, With a related allowance recorded	6,246	'
Recorded Investment, Total	16,774	'
Unpaid Principal Balance, With no related allowance recorded	12,185	'
Unpaid Principal Balance, With a related allowance recorded	6,246	'
Unpaid Principal Balance, Total	18,431	'
Related Allowance, Total	211	'
Average Recorded Investment, With no related allowance recorded	2,633	'
Average Recorded Investment, With a related allowance recorded	1,759	'
Average Recorded Investment, Total	4,392	'
Interest Income Recognized, With no related allowance recorded	53	'
Interest Income Recognized, With a related allowance recorded	40	'
Interest Income Recognized, Total	93	'
Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	7,084	'
Recorded Investment, With a related allowance recorded	16,457	'
Recorded Investment, Total	23,541	'
Unpaid Principal Balance, With no related allowance recorded	8,916	'
Unpaid Principal Balance, With a related allowance recorded	16,797	'
Unpaid Principal Balance, Total	25,713	'
Related Allowance, Total	1,409	'
Average Recorded Investment, With no related allowance recorded	19,606	'
Average Recorded Investment, With a related allowance recorded	25,755	'
Average Recorded Investment, Total	45,361	'
Interest Income Recognized, With no related allowance recorded	391	'
Interest Income Recognized, With a related allowance recorded	413	'
Interest Income Recognized, Total	804	'
Residential Mortgage Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	502	3,114
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	502	3,114
Unpaid Principal Balance, With no related allowance recorded	509	5,661
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	509	5,661
Related Allowance, Total	'	'
Average Recorded Investment, With no related allowance recorded	710	3,701
Average Recorded Investment, With a related allowance recorded	1,191	4,619
Average Recorded Investment, Total	1,901	8,320
Interest Income Recognized, With no related allowance recorded	'	155
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	155
Consumer loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	'
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	'	'
Unpaid Principal Balance, With no related allowance recorded	'	'
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	'	'
Related Allowance, Total	'	'
Average Recorded Investment, With no related allowance recorded	1,267	'
Average Recorded Investment, With a related allowance recorded	1,281	'
Average Recorded Investment, Total	2,548	'
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Commercial loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	38,412
Recorded Investment, With a related allowance recorded	'	42,052
Recorded Investment, Total	'	80,464
Unpaid Principal Balance, With no related allowance recorded	'	65,309
Unpaid Principal Balance, With a related allowance recorded	'	44,303
Unpaid Principal Balance, Total	'	109,612
Related Allowance, Total	'	7,165
Average Recorded Investment, With no related allowance recorded	'	29,801
Average Recorded Investment, With a related allowance recorded	'	42,783
Average Recorded Investment, Total	'	72,584
Interest Income Recognized, With no related allowance recorded	'	464
Interest Income Recognized, With a related allowance recorded	'	703
Interest Income Recognized, Total	'	1,167
Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	17,254	37,426
Recorded Investment, With a related allowance recorded	28,871	35,850
Recorded Investment, Total	46,125	73,276
Unpaid Principal Balance, With no related allowance recorded	20,934	59,975
Unpaid Principal Balance, With a related allowance recorded	29,477	37,917
Unpaid Principal Balance, Total	50,411	97,892
Related Allowance, Total	1,482	6,377
Average Recorded Investment, With no related allowance recorded	22,784	27,048
Average Recorded Investment, With a related allowance recorded	35,333	45,851
Average Recorded Investment, Total	58,117	72,899
Interest Income Recognized, With no related allowance recorded	409	619
Interest Income Recognized, With a related allowance recorded	620	703
Interest Income Recognized, Total	1,029	1,322
Originated loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	848	'
Recorded Investment, With a related allowance recorded	8,063	'
Recorded Investment, Total	8,911	'
Unpaid Principal Balance, With no related allowance recorded	1,073	'
Unpaid Principal Balance, With a related allowance recorded	8,365	'
Unpaid Principal Balance, Total	9,438	'
Related Allowance, Total	325	'
Average Recorded Investment, With no related allowance recorded	212	'
Average Recorded Investment, With a related allowance recorded	9,929	'
Average Recorded Investment, Total	10,141	'
Interest Income Recognized, With no related allowance recorded	12	'
Interest Income Recognized, With a related allowance recorded	167	'
Interest Income Recognized, Total	179	'
Originated loans [Member] \| Construction and Land Development [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	9,798	'
Recorded Investment, With a related allowance recorded	6,246	'
Recorded Investment, Total	16,044	'
Unpaid Principal Balance, With no related allowance recorded	11,431	'
Unpaid Principal Balance, With a related allowance recorded	6,246	'
Unpaid Principal Balance, Total	17,677	'
Related Allowance, Total	211	'
Average Recorded Investment, With no related allowance recorded	2,450	'
Average Recorded Investment, With a related allowance recorded	1,562	'
Average Recorded Investment, Total	4,012	'
Interest Income Recognized, With no related allowance recorded	53	'
Interest Income Recognized, With a related allowance recorded	40	'
Interest Income Recognized, Total	93	'
Originated loans [Member] \| Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	6,608	'
Recorded Investment, With a related allowance recorded	14,562	'
Recorded Investment, Total	21,170	'
Unpaid Principal Balance, With no related allowance recorded	8,430	'
Unpaid Principal Balance, With a related allowance recorded	14,866	'
Unpaid Principal Balance, Total	23,296	'
Related Allowance, Total	946	'
Average Recorded Investment, With no related allowance recorded	18,527	'
Average Recorded Investment, With a related allowance recorded	22,427	'
Average Recorded Investment, Total	40,954	'
Interest Income Recognized, With no related allowance recorded	344	'
Interest Income Recognized, With a related allowance recorded	413	'
Interest Income Recognized, Total	757	'
Originated loans [Member] \| Residential Mortgage Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	2,721
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	'	2,721
Unpaid Principal Balance, With no related allowance recorded	'	4,874
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	'	4,874
Related Allowance, Total	'	'
Average Recorded Investment, With no related allowance recorded	328	3,255
Average Recorded Investment, With a related allowance recorded	134	4,619
Average Recorded Investment, Total	462	7,874
Interest Income Recognized, With no related allowance recorded	'	155
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	155
Originated loans [Member] \| Consumer loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	'
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	'	'
Unpaid Principal Balance, With no related allowance recorded	'	'
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	'	'
Related Allowance, Total	'	'
Average Recorded Investment, With no related allowance recorded	1,267	'
Average Recorded Investment, With a related allowance recorded	1,281	'
Average Recorded Investment, Total	2,548	'
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Originated loans [Member] \| Commercial loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	34,705
Recorded Investment, With a related allowance recorded	'	35,850
Recorded Investment, Total	'	70,555
Unpaid Principal Balance, With no related allowance recorded	'	55,101
Unpaid Principal Balance, With a related allowance recorded	'	37,917
Unpaid Principal Balance, Total	'	93,018
Related Allowance, Total	'	6,377
Average Recorded Investment, With no related allowance recorded	'	23,793
Average Recorded Investment, With a related allowance recorded	'	41,232
Average Recorded Investment, Total	'	65,025
Interest Income Recognized, With no related allowance recorded	'	464
Interest Income Recognized, With a related allowance recorded	'	703
Interest Income Recognized, Total	'	1,167
Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	3,887	'
Recorded Investment, With a related allowance recorded	1,895	6,202
Recorded Investment, Total	5,782	6,202
Unpaid Principal Balance, With no related allowance recorded	3,935	'
Unpaid Principal Balance, With a related allowance recorded	1,931	6,386
Unpaid Principal Balance, Total	5,866	6,386
Related Allowance, Total	463	788
Average Recorded Investment, With no related allowance recorded	2,189	'
Average Recorded Investment, With a related allowance recorded	8,016	1,551
Average Recorded Investment, Total	10,205	1,551
Interest Income Recognized, With no related allowance recorded	47	'
Interest Income Recognized, With a related allowance recorded	63	'
Interest Income Recognized, Total	110	'
Acquired loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	2,179	'
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	2,179	'
Unpaid Principal Balance, With no related allowance recorded	2,186	'
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	2,186	'
Related Allowance, Total	'	'
Average Recorded Investment, With no related allowance recorded	545	'
Average Recorded Investment, With a related allowance recorded	3,434	'
Average Recorded Investment, Total	3,979	'
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	63	'
Interest Income Recognized, Total	63	'
Acquired loans [Member] \| Construction and Land Development [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	730	'
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	730	'
Unpaid Principal Balance, With no related allowance recorded	754	'
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	754	'
Related Allowance, Total	'	'
Average Recorded Investment, With no related allowance recorded	183	'
Average Recorded Investment, With a related allowance recorded	197	'
Average Recorded Investment, Total	380	'
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Acquired loans [Member] \| Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	476	'
Recorded Investment, With a related allowance recorded	1,895	'
Recorded Investment, Total	2,371	'
Unpaid Principal Balance, With no related allowance recorded	486	'
Unpaid Principal Balance, With a related allowance recorded	1,931	'
Unpaid Principal Balance, Total	2,417	'
Related Allowance, Total	463	'
Average Recorded Investment, With no related allowance recorded	1,079	'
Average Recorded Investment, With a related allowance recorded	3,328	'
Average Recorded Investment, Total	4,407	'
Interest Income Recognized, With no related allowance recorded	47	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	47	'
Acquired loans [Member] \| Residential Mortgage Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	502	'
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	502	'
Unpaid Principal Balance, With no related allowance recorded	509	'
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	509	'
Related Allowance, Total	'	'
Average Recorded Investment, With no related allowance recorded	382	'
Average Recorded Investment, With a related allowance recorded	1,057	'
Average Recorded Investment, Total	1,439	'
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Acquired loans [Member] \| Consumer loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	'
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	'	'
Unpaid Principal Balance, With no related allowance recorded	'	'
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	'	'
Related Allowance, Total	'	'
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Acquired loans [Member] \| Commercial loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	'
Recorded Investment, With a related allowance recorded	'	6,202
Recorded Investment, Total	'	6,202
Unpaid Principal Balance, With no related allowance recorded	'	'
Unpaid Principal Balance, With a related allowance recorded	'	6,386
Unpaid Principal Balance, Total	'	6,386
Related Allowance, Total	'	788
Average Recorded Investment, With a related allowance recorded	'	1,551
Average Recorded Investment, Total	'	1,551
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	4,100
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	'	4,100
Unpaid Principal Balance, With no related allowance recorded	'	10,995
Unpaid Principal Balance, Total	'	10,995
Average Recorded Investment, With no related allowance recorded	'	6,454
Average Recorded Investment, Total	'	6,454
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Covered loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	'
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	'	'
Unpaid Principal Balance, With no related allowance recorded	'	'
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	'	'
Related Allowance, Total	'	'
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Covered loans [Member] \| Construction and Land Development [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	'
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	'	'
Unpaid Principal Balance, With no related allowance recorded	'	'
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	'	'
Related Allowance, Total	'	'
Average Recorded Investment, With no related allowance recorded	'	'
Average Recorded Investment, Total	'	'
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Covered loans [Member] \| Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	393
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	'	'
Unpaid Principal Balance, With no related allowance recorded	'	787
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	'	'
Related Allowance, Total	'	'
Average Recorded Investment, With no related allowance recorded	'	446
Average Recorded Investment, Total	'	'
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Covered loans [Member] \| Residential Mortgage Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	'
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	'	393
Unpaid Principal Balance, With no related allowance recorded	'	'
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	'	787
Related Allowance, Total	'	'
Average Recorded Investment, With no related allowance recorded	'	'
Average Recorded Investment, Total	'	446
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Covered loans [Member] \| Consumer loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	'
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	'	'
Unpaid Principal Balance, With no related allowance recorded	'	'
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	'	'
Related Allowance, Total	'	'
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'
Covered loans [Member] \| Commercial loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Recorded Investment, With no related allowance recorded	'	3,707
Recorded Investment, With a related allowance recorded	'	'
Recorded Investment, Total	'	3,707
Unpaid Principal Balance, With no related allowance recorded	'	10,208
Unpaid Principal Balance, With a related allowance recorded	'	'
Unpaid Principal Balance, Total	'	10,208
Related Allowance, Total	'	'
Average Recorded Investment, With no related allowance recorded	'	6,008
Average Recorded Investment, Total	'	6,008
Interest Income Recognized, With no related allowance recorded	'	'
Interest Income Recognized, With a related allowance recorded	'	'
Interest Income Recognized, Total	'	'

Recovered_Sheet1

Loans and Allowance for Loan Losses - Summary of Age Analysis of Past Due Loans (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	$392,002	$515,823
Total loans	11,734,472	11,577,802
30-59 days past due	33,010	85,960
60-89 days past due	15,103	28,347
Greater than 90 days past due	71,192	85,726
Total past due	119,305	200,033
Current	11,615,167	11,377,769
Recorded investment > 90 days and accruing	15,620	13,243
Commercial Non-Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	24,340	29,260
Total loans	4,625,315	4,433,288
30-59 days past due	8,955	'
60-89 days past due	3,305	'
Greater than 90 days past due	11,011	'
Total past due	23,271	'
Current	4,602,044	'
Recorded investment > 90 days and accruing	1,968	'
Construction and Land Development [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	23,197	28,482
Total loans	920,408	989,306
30-59 days past due	3,564	'
60-89 days past due	3,028	'
Greater than 90 days past due	21,297	'
Total past due	27,889	'
Current	892,519	'
Recorded investment > 90 days and accruing	8,239	'
Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	60,280	95,146
Total loans	2,914,969	2,923,094
30-59 days past due	14,301	'
60-89 days past due	2,918	'
Greater than 90 days past due	22,821	'
Total past due	40,040	'
Current	2,874,929	'
Recorded investment > 90 days and accruing	3,615	'
Residential Mortgage Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	223,494	263,515
Total loans	1,695,197	1,577,944
30-59 days past due	818	21,141
60-89 days past due	3,454	4,593
Greater than 90 days past due	11,022	13,489
Total past due	15,294	39,223
Current	1,679,903	1,538,721
Recorded investment > 90 days and accruing	'	1,106
Consumer loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	60,691	99,420
Total loans	1,578,583	1,654,170
30-59 days past due	5,372	11,630
60-89 days past due	2,398	2,580
Greater than 90 days past due	5,041	6,401
Total past due	12,811	20,611
Current	1,565,772	1,633,559
Recorded investment > 90 days and accruing	1,798	2,521
Commercial loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	'	8,345,688
30-59 days past due	'	53,189
60-89 days past due	'	21,174
Greater than 90 days past due	'	65,836
Total past due	'	140,199
Current	'	8,205,489
Recorded investment > 90 days and accruing	'	9,616
Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered	8,700,767	7,107,221
30-59 days past due	26,403	46,246
60-89 days past due	11,959	21,961
Greater than 90 days past due	51,781	54,686
Total past due	90,143	122,893
Current	8,610,624	6,984,328
Recorded investment > 90 days and accruing	12,512	7,736
Originated loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Commercial non-real estate	3,633,490	2,713,385
30-59 days past due	7,369	'
60-89 days past due	2,891	'
Greater than 90 days past due	9,615	'
Total past due	19,875	'
Current	3,613,615	'
Recorded investment > 90 days and accruing	1,268	'
Originated loans [Member] \| Construction and Land Development [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Construction and land development	738,983	665,673
30-59 days past due	2,083	'
60-89 days past due	2,131	'
Greater than 90 days past due	18,079	'
Total past due	22,293	'
Current	716,690	'
Recorded investment > 90 days and accruing	8,183	'
Originated loans [Member] \| Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Commercial real estate	1,816,402	1,548,402
30-59 days past due	11,753	'
60-89 days past due	2,215	'
Greater than 90 days past due	16,383	'
Total past due	30,351	'
Current	1,786,051	'
Recorded investment > 90 days and accruing	1,309	'
Originated loans [Member] \| Residential Mortgage Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Residential mortgages	1,124,649	827,985
30-59 days past due	224	11,500
60-89 days past due	2,484	3,303
Greater than 90 days past due	4,018	4,100
Total past due	6,726	18,903
Current	1,117,923	809,082
Recorded investment > 90 days and accruing	'	'
Originated loans [Member] \| Consumer loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Consumer	1,387,243	1,351,776
30-59 days past due	4,974	10,348
60-89 days past due	2,238	2,150
Greater than 90 days past due	3,686	4,231
Total past due	10,898	16,729
Current	1,376,345	1,335,047
Recorded investment > 90 days and accruing	1,752	2,474
Originated loans [Member] \| Commercial loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Commercial non-real estate	'	4,927,460
30-59 days past due	'	24,398
60-89 days past due	'	16,508
Greater than 90 days past due	'	46,355
Total past due	'	87,261
Current	'	4,840,199
Recorded investment > 90 days and accruing	'	5,262
Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered	2,641,703	3,954,758
30-59 days past due	6,602	39,714
60-89 days past due	3,142	6,386
Greater than 90 days past due	15,123	26,940
Total past due	24,867	73,040
Current	2,616,836	3,881,718
Recorded investment > 90 days and accruing	3,108	5,507
Acquired loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Commercial non-real estate	967,485	1,690,643
30-59 days past due	1,586	'
60-89 days past due	414	'
Greater than 90 days past due	1,396	'
Total past due	3,396	'
Current	964,089	'
Recorded investment > 90 days and accruing	700	'
Acquired loans [Member] \| Construction and Land Development [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Construction and land development	158,228	295,151
30-59 days past due	1,481	'
60-89 days past due	897	'
Greater than 90 days past due	594	'
Total past due	2,972	'
Current	155,256	'
Recorded investment > 90 days and accruing	56	'
Acquired loans [Member] \| Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Commercial real estate	1,038,287	1,279,546
30-59 days past due	2,548	'
60-89 days past due	703	'
Greater than 90 days past due	5,763	'
Total past due	9,014	'
Current	1,029,273	'
Recorded investment > 90 days and accruing	2,306	'
Acquired loans [Member] \| Residential Mortgage Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Residential mortgages	347,054	486,444
30-59 days past due	594	9,641
60-89 days past due	970	1,290
Greater than 90 days past due	6,337	8,996
Total past due	7,901	19,927
Current	339,153	466,517
Recorded investment > 90 days and accruing	'	1,106
Acquired loans [Member] \| Consumer loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Consumer	130,649	202,974
30-59 days past due	393	1,282
60-89 days past due	158	430
Greater than 90 days past due	1,033	2,170
Total past due	1,584	3,882
Current	129,065	199,092
Recorded investment > 90 days and accruing	46	47
Acquired loans [Member] \| Commercial loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total-excluding covered-Commercial non-real estate	'	3,265,340
30-59 days past due	'	28,791
60-89 days past due	'	4,666
Greater than 90 days past due	'	15,774
Total past due	'	49,231
Current	'	3,216,109
Recorded investment > 90 days and accruing	'	4,354
Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	392,002	515,823
30-59 days past due	5	'
60-89 days past due	2	'
Greater than 90 days past due	4,288	4,100
Total past due	4,295	4,100
Current	387,707	511,723
Recorded investment > 90 days and accruing	'	'
Covered loans [Member] \| Commercial Non-Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	24,340	'
30-59 days past due	'	'
60-89 days past due	'	'
Greater than 90 days past due	'	'
Total past due	'	'
Current	24,340	'
Recorded investment > 90 days and accruing	'	'
Covered loans [Member] \| Construction and Land Development [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	23,197	'
30-59 days past due	'	'
60-89 days past due	'	'
Greater than 90 days past due	2,624	'
Total past due	2,624	'
Current	20,573	'
Recorded investment > 90 days and accruing	'	'
Covered loans [Member] \| Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	60,280	'
30-59 days past due	'	'
60-89 days past due	'	'
Greater than 90 days past due	675	'
Total past due	675	'
Current	59,605	'
Recorded investment > 90 days and accruing	'	'
Covered loans [Member] \| Residential Mortgage Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	223,494	263,515
30-59 days past due	'	'
60-89 days past due	'	'
Greater than 90 days past due	667	393
Total past due	667	393
Current	222,827	263,122
Recorded investment > 90 days and accruing	'	'
Covered loans [Member] \| Consumer loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	60,691	99,420
30-59 days past due	5	'
60-89 days past due	2	'
Greater than 90 days past due	322	'
Total past due	329	'
Current	60,362	99,420
Recorded investment > 90 days and accruing	'	'
Covered loans [Member] \| Commercial loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total covered loans	'	152,888
60-89 days past due	'	'
Greater than 90 days past due	'	3,707
Total past due	'	3,707
Current	'	149,181
Recorded investment > 90 days and accruing	'	'

Recovered_Sheet2

Loans and Allowance for Loan Losses - Schedule of Credit Quality Indicators of Various Classes of Loans - Credit Risk Profile by Internally Assigned Grade (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	$1,578,583	$1,654,170
Performing [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	1,571,594	1,645,199
Nonperforming [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	6,989	8,971
Commercial Non-Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	4,625,315	4,433,288
Commercial Non-Real Estate [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	3,633,490	2,713,385
Commercial Non-Real Estate [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	967,485	1,690,643
Commercial Non-Real Estate [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	24,340	29,260
Commercial Non-Real Estate [Member] \| Pass [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	4,351,662	4,214,260
Commercial Non-Real Estate [Member] \| Pass [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	3,459,635	2,610,970
Commercial Non-Real Estate [Member] \| Pass [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	877,964	1,588,435
Commercial Non-Real Estate [Member] \| Pass [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	14,063	14,855
Commercial Non-Real Estate [Member] \| Pass-Watch [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	148,516	84,828
Commercial Non-Real Estate [Member] \| Pass-Watch [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	106,657	32,393
Commercial Non-Real Estate [Member] \| Pass-Watch [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	41,741	52,361
Commercial Non-Real Estate [Member] \| Pass-Watch [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	118	74
Commercial Non-Real Estate [Member] \| Special Mention [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	59,908	33,043
Commercial Non-Real Estate [Member] \| Special Mention [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	31,600	23,550
Commercial Non-Real Estate [Member] \| Special Mention [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	28,308	6,267
Commercial Non-Real Estate [Member] \| Special Mention [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	3,226
Commercial Non-Real Estate [Member] \| Substandard [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	61,965	98,124
Commercial Non-Real Estate [Member] \| Substandard [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	35,598	46,472
Commercial Non-Real Estate [Member] \| Substandard [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	18,547	43,219
Commercial Non-Real Estate [Member] \| Substandard [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	7,820	8,433
Commercial Non-Real Estate [Member] \| Doubtful [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	3,264	3,033
Commercial Non-Real Estate [Member] \| Doubtful [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Commercial Non-Real Estate [Member] \| Doubtful [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	925	361
Commercial Non-Real Estate [Member] \| Doubtful [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	2,339	2,672
Commercial Non-Real Estate [Member] \| Loss [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Commercial Non-Real Estate [Member] \| Loss [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Commercial Non-Real Estate [Member] \| Loss [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Commercial Non-Real Estate [Member] \| Loss [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Construction and Land Development [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	920,408	989,306
Construction and Land Development [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	738,983	665,673
Construction and Land Development [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	158,228	295,151
Construction and Land Development [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	23,197	28,482
Construction and Land Development [Member] \| Pass [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	812,686	807,111
Construction and Land Development [Member] \| Pass [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	681,999	557,511
Construction and Land Development [Member] \| Pass [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	130,457	249,269
Construction and Land Development [Member] \| Pass [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	230	331
Construction and Land Development [Member] \| Pass-Watch [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	26,010	17,726
Construction and Land Development [Member] \| Pass-Watch [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	16,728	13,705
Construction and Land Development [Member] \| Pass-Watch [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	8,684	2,993
Construction and Land Development [Member] \| Pass-Watch [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	598	1,028
Construction and Land Development [Member] \| Special Mention [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	2,587	43,190
Construction and Land Development [Member] \| Special Mention [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	944	30,522
Construction and Land Development [Member] \| Special Mention [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	1,446	12,248
Construction and Land Development [Member] \| Special Mention [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	197	420
Construction and Land Development [Member] \| Substandard [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	67,190	101,873
Construction and Land Development [Member] \| Substandard [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	39,312	63,925
Construction and Land Development [Member] \| Substandard [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	17,637	30,637
Construction and Land Development [Member] \| Substandard [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	10,241	7,311
Construction and Land Development [Member] \| Doubtful [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	11,935	19,406
Construction and Land Development [Member] \| Doubtful [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	10
Construction and Land Development [Member] \| Doubtful [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	4	4
Construction and Land Development [Member] \| Doubtful [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	11,931	19,392
Construction and Land Development [Member] \| Loss [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Construction and Land Development [Member] \| Loss [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Construction and Land Development [Member] \| Loss [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Construction and Land Development [Member] \| Loss [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	2,914,969	2,923,094
Commercial Real Estate [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	1,816,402	1,548,402
Commercial Real Estate [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	1,038,287	1,279,546
Commercial Real Estate [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	60,280	95,146
Commercial Real Estate [Member] \| Pass [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	2,605,727	2,543,763
Commercial Real Estate [Member] \| Pass [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	1,656,114	1,353,453
Commercial Real Estate [Member] \| Pass [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	943,760	1,173,617
Commercial Real Estate [Member] \| Pass [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	5,853	16,693
Commercial Real Estate [Member] \| Pass-Watch [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	78,757	67,573
Commercial Real Estate [Member] \| Pass-Watch [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	32,762	36,507
Commercial Real Estate [Member] \| Pass-Watch [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	41,172	16,051
Commercial Real Estate [Member] \| Pass-Watch [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	4,823	15,015
Commercial Real Estate [Member] \| Special Mention [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	14,609	54,815
Commercial Real Estate [Member] \| Special Mention [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	3,618	29,912
Commercial Real Estate [Member] \| Special Mention [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	7,864	21,116
Commercial Real Estate [Member] \| Special Mention [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	3,127	3,787
Commercial Real Estate [Member] \| Substandard [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	202,370	228,148
Commercial Real Estate [Member] \| Substandard [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	123,890	128,088
Commercial Real Estate [Member] \| Substandard [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	45,491	68,762
Commercial Real Estate [Member] \| Substandard [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	32,989	31,298
Commercial Real Estate [Member] \| Doubtful [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	13,506	28,795
Commercial Real Estate [Member] \| Doubtful [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	18	442
Commercial Real Estate [Member] \| Doubtful [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Commercial Real Estate [Member] \| Doubtful [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	13,488	28,353
Commercial Real Estate [Member] \| Loss [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Commercial Real Estate [Member] \| Loss [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Commercial Real Estate [Member] \| Loss [Member] \| Acquired loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Commercial Real Estate [Member] \| Loss [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Credit risk profile by internally assigned grade	'	'
Residential Mortgage Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	1,695,197	1,577,944
Residential Mortgage Loans [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	1,124,649	827,985
Residential Mortgage Loans [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	223,494	263,515
Residential Mortgage Loans [Member] \| Acquired [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	347,054	486,444
Residential Mortgage Loans [Member] \| Performing [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	1,671,443	1,559,689
Residential Mortgage Loans [Member] \| Performing [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	1,110,952	820,281
Residential Mortgage Loans [Member] \| Performing [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	223,101	263,515
Residential Mortgage Loans [Member] \| Performing [Member] \| Acquired [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	337,390	475,893
Residential Mortgage Loans [Member] \| Nonperforming [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	23,754	18,255
Residential Mortgage Loans [Member] \| Nonperforming [Member] \| Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	13,697	7,704
Residential Mortgage Loans [Member] \| Nonperforming [Member] \| Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	393	'
Residential Mortgage Loans [Member] \| Nonperforming [Member] \| Acquired [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	$9,664	$10,551

Recovered_Sheet3

Loans and Allowance for Loan Losses - Schedule of Credit Quality Indicators of Various Classes of Loans - Credit Risk Profile Based on Payment Activity (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	$1,578,583	$1,654,170
Performing [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	1,571,594	1,645,199
Nonperforming [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	6,989	8,971
Originated loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	1,387,243	1,351,776
Originated loans [Member] \| Performing [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	1,382,144	1,345,487
Originated loans [Member] \| Nonperforming [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	5,099	6,289
Acquired [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	130,649	202,974
Acquired [Member] \| Performing [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	128,759	200,292
Acquired [Member] \| Nonperforming [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	1,890	2,682
Covered loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	60,691	99,420
Covered loans [Member] \| Performing [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total	$60,691	$99,420

Recovered_Sheet4

Loans and Allowance for Loan Losses - Changes in Carrying Amount of Covered Acquired Loans and Accretable Yield for Loans Receivable (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Covered loans [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Balance at beginning of period	$515,823	$671,443
Additions	'	'
Payments received, net	-150,405	-200,719
Accretion	26,584	45,099
Balance at end of period	392,002	515,823
Accretable Yield, Balance at beginning of period	115,594	153,137
Accretable Yield, Additions	'	'
Accretable Yield, Payments received, net	-861	'
Accretable Yield, Accretion	-26,584	-45,099
Accretable Yield, Increase (decrease) in expected cash flows based on actual cash flow, loan sales and foreclosures assumptions	-12,944	-19,326
Accretable Yield, Net transfer from (to) nonaccretable difference to accretable yield	22,611	26,882
Accretable Yield, Balance at end of period	97,816	115,594
Non-Covered [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Balance at beginning of period	141,201	339,452
Additions	'	'
Payments received, net	-106,444	-250,338
Accretion	30,213	52,087
Balance at end of period	64,970	141,201
Accretable Yield, Balance at beginning of period	203,186	130,691
Accretable Yield, Additions	'	'
Accretable Yield, Payments received, net	-37,961	'
Accretable Yield, Accretion	-30,213	-52,087
Accretable Yield, Increase (decrease) in expected cash flows based on actual cash flow, loan sales and foreclosures assumptions	6,465	23,688
Accretable Yield, Net transfer from (to) nonaccretable difference to accretable yield	5,636	100,894
Accretable Yield, Balance at end of period	$147,113	$203,186

Fair_Value_Schedule_of_Financi

Fair Value - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	$1,458,120	$2,048,442
Derivative assets	16,062	20,093
Total recurring fair value measurements - assets	1,474,182	2,068,535
Derivative liabilities	15,929	21,100
Total recurring fair value measurements - liabilities	15,929	21,100
U.S. Treasury and government agency securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	620	18,265
Municipal obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	43,648	50,165
Corporate debt securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	3,500	2,250
Mortgage-backed securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	1,359,970	1,774,406
Collateralized mortgage obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	45,032	198,077
Equity securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	5,350	5,279
Level 1 [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	9,470	25,794
Total recurring fair value measurements - assets	9,470	25,794
Level 1 [Member] \| U.S. Treasury and government agency securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	620	18,265
Level 1 [Member] \| Corporate debt securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	3,500	2,250
Level 1 [Member] \| Equity securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	5,350	5,279
Level 2 [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	1,448,650	2,022,648
Derivative assets	16,062	20,093
Total recurring fair value measurements - assets	1,464,712	2,042,741
Derivative liabilities	15,929	21,100
Total recurring fair value measurements - liabilities	15,929	21,100
Level 2 [Member] \| Municipal obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	43,648	50,165
Level 2 [Member] \| Mortgage-backed securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	1,359,970	1,774,406
Level 2 [Member] \| Collateralized mortgage obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Available for sale debt securities	$45,032	$198,077

Fair_Value_Additional_Informat

Fair Value - Additional Information (Detail)	9 Months Ended
Fair Value - Additional Information (Detail)	Sep. 30, 2013
Minimum [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Period of Investment	'2 years
Maximum [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Period of Investment	'5 years

Fair_Value_Schedule_of_Financi1

Fair Value - Schedule of Financial Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Collateral-dependent impaired loans	$27,981	$72,694
Other real estate owned	21,148	43,803
Total nonrecurring fair value measurements	49,129	116,497
Level 2 [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Collateral-dependent impaired loans	27,981	72,694
Total nonrecurring fair value measurements	27,981	72,694
Level 3 [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Other real estate owned	21,148	43,803
Total nonrecurring fair value measurements	$21,148	$43,803

Fair_Value_Schedule_of_Estimat

Fair Value - Schedule of Estimated Fair Values of Financial Instruments (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available for sale securities	$1,458,120	$2,048,442
Held to maturity securities	2,653,867	1,710,465
Loans, net	11,596,249	11,441,631
Loans held for sale	18,444	50,605
Derivative financial instruments	16,062	20,093
Deposits	15,054,871	15,744,188
Long-term debt	376,664	396,589
Derivative financial instruments	15,929	21,100
Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash, interest-bearing bank deposits, and federal funds sold	888,005	1,948,679
Available for sale securities	9,470	25,794
Held to maturity securities	100,688	'
Accrued interest receivable	42,039	45,616
Federal funds purchased	22,193	25,704
Securities sold under agreements to repurchase	760,586	613,429
Accrued interest payable	5,694	4,814
Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available for sale securities	1,448,650	2,022,648
Held to maturity securities	2,553,179	1,710,465
Loans, net	27,981	72,694
Loans held for sale	18,444	50,605
Derivative financial instruments	16,062	20,093
Long-term debt	384,239	410,791
Derivative financial instruments	15,929	21,100
Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Loans, net	11,528,860	11,494,409
Deposits	15,017,314	15,757,044
Total Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash, interest-bearing bank deposits, and federal funds sold	888,005	1,948,679
Available for sale securities	1,458,120	2,048,442
Held to maturity securities	2,653,867	1,710,465
Loans, net	11,556,841	11,567,103
Loans held for sale	18,444	50,605
Accrued interest receivable	42,039	45,616
Derivative financial instruments	16,062	20,093
Deposits	15,017,314	15,757,044
Federal funds purchased	22,193	25,704
Securities sold under agreements to repurchase	760,586	613,429
Long-term debt	384,239	410,791
Accrued interest payable	5,694	4,814
Derivative financial instruments	15,929	21,100
Carrying Amount [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash, interest-bearing bank deposits, and federal funds sold	888,005	1,948,679
Available for sale securities	1,458,120	2,048,442
Held to maturity securities	2,666,082	1,668,018
Loans, net	11,596,250	11,441,631
Loans held for sale	18,444	50,605
Accrued interest receivable	42,039	45,616
Derivative financial instruments	16,062	20,093
Deposits	15,054,871	15,744,188
Federal funds purchased	22,193	25,704
Securities sold under agreements to repurchase	760,586	613,429
Long-term debt	376,664	396,589
Accrued interest payable	5,694	4,814
Derivative financial instruments	$15,929	$21,100

Derivatives_Notional_and_Fair_

Derivatives - Notional and Fair Values of Derivative Instruments on Balance Sheet (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]	'	'
Notional Amounts	$752,936	$720,868
Derivatives not designated as hedging instruments, Fair Value, Gross Assets	15,253	19,448
Derivatives not designated as hedging instruments, Fair Value, Gross Liability	15,082	20,455
Derivatives designated as hedging instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amounts	'	140,000
Derivatives not designated as hedging instruments, Fair Value, Gross Liability	'	298
Derivatives designated as hedging instruments [Member] \| Interest rate swap [Member] \| Loss on Effective Cash Flow Hedges [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amounts	'	140,000
Derivatives designated as hedging instruments [Member] \| Other liabilities [Member] \| Interest rate swap [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not designated as hedging instruments, Fair Value, Gross Liability	'	298
Derivatives not designated as hedging instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not designated as hedging instruments, Fair Value, Gross Assets	16,062	20,093
Derivatives not designated as hedging instruments, Fair Value, Gross Liability	15,929	20,802
Derivatives not designated as hedging instruments [Member] \| Interest rate swap [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amounts	661,421	547,477
Derivatives not designated as hedging instruments [Member] \| Risk Participation Agreements [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amounts	20,287	'
Derivatives not designated as hedging instruments [Member] \| Forward Commitments To Sell Residential Mortgage Loans [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amounts	24,473	115,256
Derivatives not designated as hedging instruments [Member] \| Interest Rate Lock Commitments On Residential Mortgage Loan [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amounts	12,814	58,135
Derivatives not designated as hedging instruments [Member] \| Other liabilities [Member] \| Interest rate swap [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not designated as hedging instruments, Fair Value, Gross Liability	15,079	20,157
Derivatives not designated as hedging instruments [Member] \| Other liabilities [Member] \| Risk Participation Agreements [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not designated as hedging instruments, Fair Value, Gross Liability	3	'
Derivatives not designated as hedging instruments [Member] \| Other liabilities [Member] \| Forward Commitments To Sell Residential Mortgage Loans [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not designated as hedging instruments, Fair Value, Gross Liability	355	590
Derivatives not designated as hedging instruments [Member] \| Other liabilities [Member] \| Interest Rate Lock Commitments On Residential Mortgage Loan [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not designated as hedging instruments, Fair Value, Gross Liability	11	55
Derivatives not designated as hedging instruments [Member] \| Other liabilities [Member] \| Foreign exchange forward contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amounts	33,941	'
Derivatives not designated as hedging instruments, Fair Value, Gross Assets	507	'
Derivatives not designated as hedging instruments, Fair Value, Gross Liability	481	'
Derivatives not designated as hedging instruments [Member] \| Other assets [Member] \| Interest rate swap [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not designated as hedging instruments, Fair Value, Gross Assets	15,249	19,448
Derivatives not designated as hedging instruments [Member] \| Other assets [Member] \| Risk Participation Agreements [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not designated as hedging instruments, Fair Value, Gross Assets	4	'
Derivatives not designated as hedging instruments [Member] \| Other assets [Member] \| Forward Commitments To Sell Residential Mortgage Loans [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not designated as hedging instruments, Fair Value, Gross Assets	51	190
Derivatives not designated as hedging instruments [Member] \| Other assets [Member] \| Interest Rate Lock Commitments On Residential Mortgage Loan [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not designated as hedging instruments, Fair Value, Gross Assets	$251	$455

Derivatives_Additional_Informa

Derivatives - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
Derivatives - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]	'	'
Notional amount of interest rate derivatives	$752,936,000	$720,868,000
Variable rate term loan agreement maturity	'June 2013.	'
Derivative, net hedge ineffectiveness gain (loss)	0	0
Termination value of derivatives in a net liability position	10,100,000	'
Collateral obligations for derivative counterparties	11,100,000	'
Interest rate swap [Member]	'	'
Derivative [Line Items]	'	'
Notional amount of interest rate derivatives	$140,000,000	'

Derivatives_Offsetting_Derivat

Derivatives - Offsetting Derivative Assets and Liabilities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'	'
Gross Amounts of Recognized Assets	$15,253	$19,448
Gross Amounts Offset in the Statement of Financial Position	'	'
Net Amounts of Assets Presented in the Statement of Financial Position	15,253	19,448
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments, Assets	1,949	'
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received, Assets	'	'
Net Amount, Assets	13,304	19,448
Gross Amounts of Recognized Liabilities	15,082	20,455
Gross Amounts Offset in the Statement of Financial Position	'	'
Net Amounts of Liabilities Presented in the Statement of Financial Position	15,082	20,455
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments, Liability	1,949	'
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Pledged, Liability	9,113	16,839
Net Amount, Liability	$4,020	$3,616

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	1 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2013	8-May-13
	Apr. 30, 2013	Accelerated share repurchase program [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Shares authorized for repurchase	5.00%	'
Accelerated share repurchase transaction, paid	'	$115
Received from accelerated share repurchase stock settlement	'	2.8
Percentage of repurchased accelerated share repurchase program	'	76.00%

Stockholders_Equity_Components

Stockholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), Beginning balance	'	'	($22,925)	($26,510)
Other comprehensive income before income taxes:	'	'	'	'
Net change in unrealized gain (loss)	-9,685	10,821	-96,074	24,410
Reclassification of net (gains) losses realized and included in earnings	'	'	5,835	4,371
Amortization/accretion of unrealized net gain/loss on securities transferred to HTM	-1,456	-2,725	-7,099	-5,645
Income tax expense (benefit)	'	'	-35,492	8,413
Accumulated other comprehensive income (loss), Ending balance	-84,771	-11,787	-84,771	-11,787
Available for Sale Securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), Beginning balance	'	'	38,854	60,478
Other comprehensive income before income taxes:	'	'	'	'
Net change in unrealized gain (loss)	'	'	-96,070	24,780
Transfer of net unrealized gain from AFS to HTM, net of cumulative tax effect	'	'	36,208	-24,598
Reclassification of net (gains) losses realized and included in earnings	'	'	'	-929
Income tax expense (benefit)	'	'	-35,115	8,693
Accumulated other comprehensive income (loss), Ending balance	14,107	51,038	14,107	51,038
HTM Securities Transferred from AFS [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), Beginning balance	'	'	19,090	'
Other comprehensive income before income taxes:	'	'	'	'
Transfer of net unrealized gain from AFS to HTM, net of cumulative tax effect	'	'	-36,208	24,598
Amortization/accretion of unrealized net gain/loss on securities transferred to HTM	'	'	-7,099	-5,645
Income tax expense (benefit)	'	'	-2,563	-2,122
Accumulated other comprehensive income (loss), Ending balance	-21,654	21,075	-21,654	21,075
Employee Benefit Plans [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), Beginning balance	'	'	-80,688	-86,923
Other comprehensive income before income taxes:	'	'	'	'
Reclassification of net (gains) losses realized and included in earnings	'	'	5,534	5,260
Income tax expense (benefit)	'	'	2,070	1,971
Accumulated other comprehensive income (loss), Ending balance	-77,224	-83,634	-77,224	-83,634
Loss on Effective Cash Flow Hedges [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), Beginning balance	'	'	-181	-65
Other comprehensive income before income taxes:	'	'	'	'
Net change in unrealized gain (loss)	'	'	-4	-370
Reclassification of net (gains) losses realized and included in earnings	'	'	301	40
Income tax expense (benefit)	'	'	116	-129
Accumulated other comprehensive income (loss), Ending balance	'	($266)	'	($266)

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Items in Consolidated Income Statements Affected by Amounts Reclassified From Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Comprehensive Income Loss Amount Reclassified From Accumulated Other Comprehensive Income [Abstract]	'	'	'	'
Reclassification adjustment for net gains and losses realized and included in earnings	$1,553	$842	$5,835	$4,371
Tax effect	'	'	'	325
Net of tax	'	'	'	604
Amortization/accretion of unrealized net gain/loss on securities transferred to HTM	1,456	2,725	7,099	5,645
Tax effect	'	'	2,563	2,122
Net of tax	'	'	4,536	3,523
Amortization of defined benefit pension and post-retirement items	'	'	-5,534	-5,260
Tax effect	'	'	-2,070	-1,971
Net of tax	'	'	-3,464	-3,289
Gains and losses on cash flow hedges	'	'	-301	-40
Tax effect	'	'	-105	-14
Net of tax	'	'	-196	-26
Total reclassifications, net of tax	'	'	$876	$812

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Earnings Per Common Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator:	'	'	'	'
Net income to common shareholders	$33,202	$46,984	$128,640	$104,783
Net income allocated to participating securities - basic and diluted	616	281	2,398	844
Net income allocated to common shareholders - basic and diluted	$32,586	$46,703	$126,242	$103,939
Denominator:	'	'	'	'
Weighted-average common shares - basic	82,091	84,777	83,404	84,757
Dilutive potential common shares	114	855	92	768
Weighted average common shares - diluted	82,205	85,632	83,496	85,525
Earnings per common share:	'	'	'	'
Basic	$0.40	$0.55	$1.51	$1.23
Diluted	$0.40	$0.55	$1.51	$1.22

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
Earnings Per Share - Additional Information (Detail)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Weighted-average anti-dilutive potential common shares	721,863	1,149,491	1,076,894	908,409

ShareBased_Payment_Arrangement2

Share-Based Payment Arrangements - Schedule of Option Activity Under Stock Option Plans (Detail) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Number of Shares, Outstanding at Beginning Balance	1,555,296
Number of Shares, Exercised	-21,145
Number of Shares, Forfeited or expired	-96,226
Number of Shares, Outstanding at Ending Balance	1,437,925
Number of Shares, Exercisable at Ending Balance	990,202
Weighted- Average Exercise Price, Outstanding at Beginning Balance	$38.57
Weighted- Average Exercise Price, Exercised	$27.51
Weighted- Average Exercise Price, Forfeited or expired	$45.15
Weighted- Average Exercise Price, Outstanding at Ending Balance	$38.30
Weighted- Average Exercise Price, Exercisable at Ending Balance	$41.15
Weighted-Average Remaining Contractual Term, Outstanding at Ending Balance (in years)	'4 years 8 months 12 days
Weighted-Average Remaining Contractual Term, Exercisable at Ending Balance (in years)	'3 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding at Ending Balance	$797
Aggregate Intrinsic Value, Exercisable at Ending Balance	$389

ShareBased_Payment_Arrangement3

Share-Based Payment Arrangements - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
	Bank	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Intrinsic value of options exercised	$0.10	$0.50
Unrecognized compensation cost	29.4	'
Weighted-average period in years	'3 years 1 month 6 days	'
Total fair value of shares vested	$1.20	$0.90
Shareholder return period	'3 years	'
Number of peer group of regional banks	50	'
Performance Share Award [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares granted to key members of executives and senior management	67,533	'
Fair Value of shares granted	$32.84	'
Percentage of maximum number of shares earned of target award	200.00%	'

ShareBased_Payment_Arrangement4

Share-Based Payment Arrangements - Schedule of Nonvested Restricted and Performance Shares (Detail) (Restricted Stock and Performance Shares [Member], USD $)	9 Months Ended
	Sep. 30, 2013
Restricted Stock and Performance Shares [Member]	'
Nonvested Share Activity [Line Items]	'
Number of Shares, Nonvested at Beginning Balance	1,684,360
Number of Shares, Granted	95,586
Number of Shares, Vested	-38,909
Number of Shares, Forfeited	-70,884
Number of Shares, Nonvested at Ending Balance	1,670,153
Weighted-Average Grant-Date Fair Value, Nonvested at Beginning Balance	$31.56
Weighted-Average Grant-Date Fair Value, Granted	$32.03
Weighted-Average Grant-Date Fair Value, Vested	$34.52
Weighted-Average Grant-Date Fair Value, Forfeited	$31.25
Weighted-Average Grant-Date Fair Value, Nonvested at Ending Balance	$31.52

Retirement_Plans_Components_of

Retirement Plans - Components of Net Periodic Benefits Cost (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Service cost	$52	$48	'	'
Interest cost	327	361	'	'
Amortization of prior service cost	'	-13	'	'
Amortization of net loss	459	176	'	'
Amortization of transition obligation	'	1	'	'
Net periodic benefit cost	838	573	'	'
Pension Benefits [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Service cost	3,969	3,249	11,905	9,743
Interest cost	4,151	4,301	12,457	12,904
Expected return on plan assets	-6,982	-6,350	-20,946	-19,049
Amortization of net loss	1,605	1,645	4,813	4,936
Net periodic benefit cost	2,743	2,845	8,229	8,534
Other Post-retirement Benefits [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Service cost	'	'	162	144
Interest cost	'	'	987	1,083
Amortization of prior service cost	'	'	'	-41
Amortization of net loss	'	'	1,320	530
Amortization of transition obligation	'	'	'	4
Net periodic benefit cost	'	'	$2,469	$1,720

Retirement_Plans_Additional_In

Retirement Plans - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]	'
Percentage of compensation saved by participant for which employer contributes hundred percent	100.00%
Employer matching contribution for first one percent of compensation saved	1.00%
Percentage of compensation saved by participant for which employer contributes fifty percent	50.00%
Employer matching contribution for next five percent of compensation saved	5.00%
Pension Benefits [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Anticipated contributions for current fiscal year	10
Hancock Plans [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Percentage of savings for calculating each employee participation in plan	50.00%
Maximum percentage of compensation on base percentage for participating in plan	6.00%
Whitney Plans [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Percentage of savings for calculating each employee participation in plan	100.00%
Maximum percentage of compensation on base percentage for participating in plan	4.00%

Other_Noninterest_Income_Compo

Other Noninterest Income - Components of Other Income (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]	'	'	'	'
Income from bank owned life insurance	$2,574	$2,870	$8,764	$8,617
Credit related fees	2,995	1,545	5,969	5,130
Income from derivatives	1,257	455	3,296	2,091
Safety deposit box income	467	502	1,480	1,524
Gain/(loss) on sale of assets	801	2,705	1,277	2,909
Other miscellaneous	1,432	1,693	5,863	10,830
Total other noninterest income	$9,526	$9,770	$26,649	$31,101

Other_Noninterest_Expense_Comp

Other Noninterest Expense - Components of Other Noninterest Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]	'	'	'	'
Insurance expense	$887	$1,207	$3,018	$4,428
Ad valorem and franchise taxes	2,809	2,185	7,193	6,608
Printing and supplies	1,143	1,488	3,963	6,162
Public relations and contributions	969	1,065	3,960	4,827
Travel expense	1,074	1,282	3,475	4,464
Other real estate owned expense, net	2,439	4,590	6,502	11,630
Tax credit investment amortization	4,880	1,513	7,553	4,538
Other miscellaneous	19,851	4,488	32,504	19,311
Total other noninterest expense	$34,052	$17,818	$68,168	$61,968

Segment_Reporting_Schedule_of_

Segment Reporting - Schedule of Segment Reporting Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]	'	'	'	'	'
Interest income	$181,639	$189,205	$546,560	$571,410	'
Interest expense	-10,109	-11,949	-31,836	-40,407	'
Net interest income	171,530	177,256	514,724	531,003	'
Provision for loan losses	-7,569	-8,101	-25,404	-26,141	'
Noninterest income	63,057	62,842	187,141	187,888	'
Depreciation and amortization	-8,157	-8,067	-24,178	-25,229	'
Other noninterest expense	-174,048	-161,647	-479,879	-529,920	'
Securities transactions	'	917	'	929	'
Income before income taxes	44,813	63,200	172,404	138,530	'
Income tax expense	11,611	16,216	43,764	33,747	'
Net income	33,202	46,984	128,640	104,783	'
Goodwill	625,675	628,877	625,675	628,877	628,877
Total assets	18,801,846	18,524,130	18,801,846	18,524,130	19,464,485
Total interest income from external customers	181,639	189,205	546,560	571,410	'
Operating Segments [Member] \| Hancock [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Interest income	66,509	73,558	198,115	201,525	'
Interest expense	-4,318	-5,402	-13,753	-17,587	'
Net interest income	62,191	68,156	184,362	183,938	'
Provision for loan losses	-7,479	-4,814	-15,986	-7,313	'
Noninterest income	18,527	20,205	56,804	59,644	'
Depreciation and amortization	-3,983	-3,830	-11,572	-10,884	'
Other noninterest expense	-65,756	-59,821	-173,037	-174,796	'
Securities transactions	'	94	'	98	'
Income before income taxes	3,500	19,990	40,571	50,687	'
Income tax expense	338	5,433	7,521	11,808	'
Net income	3,162	14,556	33,050	38,879	'
Goodwill	94,130	94,130	94,130	94,130	'
Total assets	6,513,536	6,390,378	6,513,536	6,390,378	'
Total interest income from affiliates	807	1,010	2,741	3,033	'
Total interest income from external customers	65,702	72,548	195,374	198,492	'
Operating Segments [Member] \| Whitney [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Interest income	109,909	110,917	333,322	355,776	'
Interest expense	-4,583	-5,669	-14,162	-19,915	'
Net interest income	105,326	105,248	319,160	335,861	'
Provision for loan losses	899	-2,353	-6,016	-18,696	'
Noninterest income	34,366	31,938	97,278	98,122	'
Depreciation and amortization	-3,868	-3,981	-11,698	-13,596	'
Other noninterest expense	-96,334	-90,087	-269,735	-320,985	'
Securities transactions	'	823	'	824	'
Income before income taxes	40,389	41,588	128,989	81,530	'
Income tax expense	10,619	10,130	34,133	18,938	'
Net income	29,770	31,458	94,856	62,592	'
Goodwill	527,063	530,265	527,063	530,265	'
Total assets	12,620,550	12,343,043	12,620,550	12,343,043	'
Total interest income from affiliates	308	328	748	697	'
Total interest income from external customers	109,601	110,589	332,574	355,079	'
Operating Segments [Member] \| Other [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Interest income	6,336	6,068	18,612	17,839	'
Interest expense	-2,208	-2,100	-7,065	-6,290	'
Net interest income	4,128	3,968	11,547	11,549	'
Provision for loan losses	-989	-934	-3,402	-132	'
Noninterest income	10,174	10,722	33,093	30,149	'
Depreciation and amortization	-306	-256	-908	-749	'
Other noninterest expense	-11,968	-11,761	-37,141	-34,166	'
Securities transactions	'	'	'	7	'
Income before income taxes	1,039	1,739	3,189	6,658	'
Income tax expense	654	653	2,110	3,001	'
Net income	385	1,086	1,079	3,657	'
Goodwill	4,482	4,482	4,482	4,482	'
Total assets	2,747,834	2,737,061	2,747,834	2,737,061	'
Total interest income from external customers	6,336	6,068	18,612	17,839	'
Eliminations [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Interest income	-1,115	-1,338	-3,489	-3,730	'
Interest expense	1,000	1,222	3,144	3,385	'
Net interest income	-115	-116	-345	-345	'
Noninterest income	-10	-23	-34	-27	'
Other noninterest expense	10	22	34	27	'
Income before income taxes	-115	-117	-345	-345	'
Net income	-115	-117	-345	-345	'
Total assets	-3,080,074	-2,946,352	-3,080,074	-2,946,352	'
Total interest income from affiliates	($1,115)	($1,338)	($3,489)	($3,730)	'