Hancock Whitney Corporation - 6 (HWC) 10-Q 8 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Nov. 01, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	HANCOCK HOLDING CO
Entity Filer Category	Large Accelerated Filer
Entity Central Index Key	750,577
Trading Symbol	hbhc
Amendment Flag	false
Document Type	10-Q
Document Fiscal Period Focus	Q3
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		77,574,054

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 329,872	$ 303,874
Interest-bearing bank deposits	128,028	564,671
Federal funds sold	892	884
Securities available for sale, at fair value (amortized cost of $2,370,621 and $2,086,745)	2,414,680	2,093,404
Securities held to maturity (fair value of $2,482,540 and $2,375,851)	2,428,432	2,370,388
Loans held for sale	42,545	20,434
Loans	16,070,821	15,703,314
Less: allowance for loan losses	(236,061)	(181,179)
Loans, net	15,834,760	15,522,135
Property and equipment, net of accumulated depreciation of $227,075 and $209,763	363,656	377,015
Prepaid expenses	18,842	17,560
Other real estate, net	19,097	26,256
Accrued interest receivable	59,000	54,068
Goodwill	621,193	621,193
Other intangible assets, net	92,523	107,538
Life insurance contracts	478,602	434,550
FDIC loss share receivable	18,030	29,868
Deferred tax asset, net	73,419	75,830
Other assets	185,159	213,937
Total assets	23,108,730	22,833,605
Deposits:
Noninterest-bearing	7,543,041	7,276,127
Interest-bearing	11,342,436	11,072,785
Total deposits	18,885,477	18,348,912
Short-term borrowings	1,075,956	1,423,644
Long-term debt	463,710	490,145
Accrued interest payable	9,919	6,609
Other liabilities	184,541	151,152
Total liabilities	20,619,603	20,420,462
Stockholders' equity
Common Stock - $3.33 par value per share; 350,000,000 shares authorized, 77,570,515 and 77,496,429 outstanding	258,310	258,063
Capital surplus	1,697,147	1,684,101
Treasury shares at cost - 9,246,656 and 9,319,082 shares	(228,701)	(226,370)
Retained earnings	818,060	777,944
Accumulated other comprehensive loss, net	(55,689)	(80,595)
Total stockholders' equity	2,489,127	2,413,143
Total liabilities and stockholders' equity	$ 23,108,730	$ 22,833,605

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Consolidated Balance Sheets [Abstract]
Securities available for sale, amortized cost	$ 2,370,621	$ 2,086,745
Securities held to maturity, fair value	2,482,540	2,375,851
Property and equipment, accumulated depreciation	$ 227,075	$ 209,763
Common stock, par value per share	$ 3.33	$ 3.33
Common stock, shares authorized	350,000,000	350,000,000
Common stock, shares outstanding	77,570,515	77,496,429
Treasury shares at cost, shares	9,246,656	9,319,082

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest income:
Loans, including fees	$ 155,761	$ 146,398	$ 466,591	$ 435,270
Loans held for sale	323	176	731	494
Securities-taxable	21,782	23,631	68,788	66,095
Securities-tax exempt	3,780	839	8,593	2,564
Short-term investments	507	285	1,597	913
Total interest income	182,153	171,329	546,300	505,336
Interest expense:
Deposits	12,590	8,933	36,926	23,680
Short-term borrowings	1,040	273	2,942	631
Long-term debt	5,010	5,293	15,114	14,246
Total interest expense	18,640	14,499	54,982	38,557
Net interest income	163,513	156,830	491,318	466,779
Provision for loan losses	18,972	10,080	96,204	22,842
Net interest income after provision for loan losses	144,541	146,750	395,114	443,937
Noninterest income:
Service charges on deposit accounts	18,716	18,619	55,493	53,842
Trust fees	11,512	11,345	34,825	34,340
Bank card and ATM fees	11,808	11,637	35,110	34,688
Investment and annuity fees	4,289	6,149	14,265	16,037
Secondary mortgage market operations	4,917	3,413	12,005	9,695
Insurance commissions and fees	1,088	2,238	3,635	6,587
Amortization of FDIC loss share receivable	(1,539)	(1,564)	(4,678)	(4,034)
Other income	11,866	8,370	32,768	26,139
Securities transactions	351	4	1,465	337
Total noninterest income	63,008	60,211	184,888	177,631
Noninterest expense:
Compensation expense	70,290	71,187	213,524	206,754
Employee benefits	12,873	12,968	42,591	41,472
Personnel expense	83,163	84,155	256,115	248,226
Net occupancy expense	10,068	11,222	30,818	34,203
Equipment expense	3,349	3,598	10,203	11,623
Data processing expense	14,590	13,844	43,167	41,412
Professional services expense	6,584	7,656	21,917	31,978
Amortization of intangibles	4,886	6,027	15,015	18,493
Telecommunications and postage	3,284	3,485	9,917	10,607
Deposit insurance and regulatory fees	5,969	4,225	17,415	12,033
Other real estate expense, net	(5,214)	422	(4,096)	1,379
Other expense	22,379	16,559	55,561	53,671
Total noninterest expense	149,058	151,193	456,032	463,625
Income before income taxes	58,491	55,768	123,970	157,943
Income taxes	11,772	14,602	26,505	41,789
Net income	$ 46,719	$ 41,166	$ 97,465	$ 116,154
Earnings per common share-basic	$ 0.59	$ 0.52	$ 1.23	$ 1.45
Earnings per common share-diluted	0.59	0.52	1.23	1.45
Dividends paid per share	$ 0.24	$ 0.24	$ 0.72	$ 0.72
Weighted average shares outstanding-basic	77,550	77,928	77,525	78,452
Weighted average shares outstanding-diluted	77,677	78,075	77,653	78,609

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 46,719	$ 41,166	$ 97,465	$ 116,154
Other comprehensive income:
Net change in unrealized (loss) gain on available for sale securities and hedges	(5,604)	15,131	39,997	2,174
Reclassification adjustment for net losses realized and included in earnings	1,158	802	2,960	2,208
Valuation adjustment for employee benefit plans	(6,347)	4,963	(6,347)	(959)
Amortization of unrealized net loss on securities transferred to held to maturity	1,108	1,023	2,736	2,609
Other comprehensive (loss) income before income taxes	(9,685)	21,919	39,346	6,032
Income tax (benefit) expense	(3,537)	8,002	14,440	2,125
Other comprehensive (loss) income net of income taxes	(6,148)	13,917	24,906	3,907
Comprehensive income	$ 40,571	$ 55,083	$ 122,371	$ 120,061

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2014	$ 267,820	$ 1,689,291	$ 723,496	$ (50,074)	$ (158,131)	$ 2,472,402
Balance, Shares at Dec. 31, 2014	80,426,485
Net income			116,154			116,154
Other comprehensive income				3,907		3,907
Comprehensive income			116,154	3,907		120,061
Cash dividends declared ($0.72 per common share)			(57,881)			(57,881)
Common stock activity, long-term incentive plan	$ 747	21,612			(12,544)	9,815
Common stock activity, long-term incentive plan, Shares	224,399
Purchase of common stock under stock buyback program	$ (10,429)				(80,407)	(90,836)
Purchase of common stock under stock buyback program, Shares	(3,131,886)
Balance at Sep. 30, 2015	$ 258,138	1,710,903	781,769	(46,167)	(251,082)	2,453,561
Balance, Shares at Sep. 30, 2015	77,518,998
Balance at Dec. 31, 2015	$ 258,063	1,684,101	777,944	(80,595)	(226,370)	$ 2,413,143
Balance, Shares at Dec. 31, 2015	77,496,429					77,496,429
Net income			97,465			$ 97,465
Other comprehensive income				24,906		24,906
Comprehensive income			97,465	24,906		122,371
Cash dividends declared ($0.72 per common share)			(57,349)			(57,349)
Common stock activity, long-term incentive plan	$ 159	13,209			$ (3,227)	10,141
Common stock activity, long-term incentive plan, Shares	47,547
Purchase of common stock under stock buyback program, Shares					0
Issuance of stock from dividend reinvestment	$ 88	(163)			$ 896	821
Issuance of stock from dividend reinvestment, Shares	26,539
Balance at Sep. 30, 2016	$ 258,310	$ 1,697,147	$ 818,060	$ (55,689)	$ (228,701)	$ 2,489,127
Balance, Shares at Sep. 30, 2016	77,570,515					77,570,515

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Retained Earnings [Member]
Cash dividends declared, per common share	$ 0.72	$ 0.72

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 97,465	$ 116,154
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	21,350	21,533
Provision for loan losses	96,204	22,842
Gain on other real estate owned	(5,145)	(521)
Deferred tax (benefit) expense	(14,713)	11,895
Increase in cash surrender value of life insurance contracts	(8,807)	(7,700)
(Gain) loss on disposal of other assets	(6,014)	1,626
Net (increase) decrease in loans held for sale	(21,698)	498
Net amortization of securities premium/discount	20,836	15,456
Amortization of intangible assets	15,015	18,493
Amortization of FDIC indemnification asset	4,678	4,034
Stock-based compensation expense	10,555	9,469
Increase (decrease) in interest payable and other liabilities	8,502	(6,753)
Net payments (to) from FDIC for loss share claims	(436)	14,667
Decrease in FDIC loss share receivable	3,487	6,309
Decrease (increase) in other assets	40,693	(9,980)
Other, net	6,572	4,768
Net cash provided by operating activities	268,544	222,790
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities	141,716	9,287
Proceeds from maturities of securities available for sale	298,810	755,663
Purchases of securities available for sale	(720,241)	(1,286,443)
Proceeds from maturities of securities held to maturity	307,633	439,410
Purchases of securities held to maturity	(371,657)	(658,226)
Net decrease in short-term investments	436,635	608,534
Proceeds from sales of loans	166,922
Net increase in loans	(591,696)	(882,702)
Purchase of life insurance contracts	(40,000)
Purchases of property and equipment	(10,817)	(19,529)
Proceeds from sales of property and equipment	677	13,607
Proceeds from sales of other real estate	20,709	39,612
Other, net	(3,651)	(8,603)
Net cash used in investing activities	(364,960)	(989,390)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	536,581	867,117
Net decrease in short-term borrowings	(347,688)	(102,391)
Repayments of long-term debt	(16,796)	(31,621)
Net proceeds from issuance of long-term debt	6,796	149,153
Dividends paid	(57,349)	(57,881)
Purchase of common stock under stock buyback program		(90,836)
Proceeds from exercise of stock options	49	347
Issuance of stock from dividend reinvestment	821
Net cash provided by financing activities	122,414	733,888
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	25,998	(32,712)
CASH AND DUE FROM BANKS, BEGINNING	303,874	356,455
CASH AND DUE FROM BANKS, ENDING	329,872	323,743
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	$ 12,012	$ 12,997

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2016
Basis of Presentation [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. The Company has also evaluated all subsequent events for potential recognition and disclosure through the filing of this Form 10-Q. Some financial information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the 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 Annual Report on Form 10-K for the year ended December 31, 2015. 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. Certain prior period amounts have been reclassified to conform to the current period presentation. Beginning in the second quarter of 2016, the presentation of loan disclosures has been modified from prior filings as discussed in Note 3 – Loans and Allowance for Loan Losses. Effective January 1, 2016, the Company retrospectively adopted accounting guidance intended to simplify the presentation of debt issuance costs by requiring that costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. Historically, debt issuance costs were reported in the “Other Assets” line items in the Consolidated Balance Sheets and Statements of Cash Flows. All historical periods have been restated to reflect the revised presentation and new required disclosures. The adoption of this guidance did not have a material impact on the Company’s financial condition or operating results. Use of Estimates The accounting principles the Company follows and the methods for applying these principles conform with GAAP and with general practices followed by 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 There were no 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 its Annual Report on Form 10-K for the year ended December 31, 2015.                      

Securities

Securities	9 Months Ended
	Sep. 30, 2016
Securities [Abstract]
Securities	2. Securities The amortized cost and estimated fair value of securities classified as available for sale and held to maturity follow.      Securities Available for Sale  (in thousands) September 30, 2016 December 31, 2015  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 $ 20,604 $ 67 $ — $ 20,671 $ 135 $ — $ 1 $ 134  Municipal obligations 214,403 3,024 409 217,018 39,410 235 38 39,607  Residential mortgage-backed securities 1,737,812 38,204 91 1,775,925 1,750,168 19,387 11,182 1,758,373  Commercial mortgage-backed securities 172,525 687 103 173,109 — — — —  Collateralized mortgage obligations 220,912 2,344 — 223,256 291,085 140 2,192 289,033  Corporate debt securities 3,500 — — 3,500 3,500 — — 3,500  Equity securities 865 336 — 1,201 2,447 358 48 2,757  $ 2,370,621 $ 44,662 $ 603 $ 2,414,680 $ 2,086,745 $ 20,120 $ 13,461 $ 2,093,404      Securities Held to Maturity  (in thousands) September 30, 2016 December 31, 2015  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 $ 50,000 $ 860 $ — $ 50,860 $ 50,000 $ — $ 410 $ 49,590  Municipal obligations 541,839 11,182 1,462 551,559 185,890 3,475 1,166 188,199  Residential mortgage-backed securities 903,703 36,200 — 939,903 1,014,135 15,585 1,589 1,028,131  Collateralized mortgage obligations 932,890 8,767 1,439 940,218 1,120,363 2,244 12,676 1,109,931  $ 2,428,432 $ 57,009 $ 2,901 $ 2,482,540 $ 2,370,388 $ 21,304 $ 15,841 $ 2,375,851  The following table presents the amortized cost and estimated fair value of debt securities at September 30 , 2016 by contractual maturity. Actual maturities will differ from contractual maturities because of rights to call or repay obligations with or without penalties and scheduled and unscheduled principal payments on mortgage-backed securities and collateralized mortgage obligations.      (in thousands) Amortized Fair  Debt Securities Available for Sale Cost Value  Due in one year or less $ 4,864 $ 4,900  Due after one year through five years 47,593 48,597  Due after five years through ten years 609,897 621,549  Due after ten years 1,707,402 1,738,433  Total available for sale debt securities $ 2,369,756 $ 2,413,479   Amortized Fair  Debt Securities Held to Maturity Cost Value  Due in one year or less $ 14,982 $ 15,019  Due after one year through five years 135,330 138,737  Due after five years through ten years 510,536 517,652  Due after ten years 1,767,584 1,811,132  Total held to maturity securities $ 2,428,432 $ 2,482,540 The Company held no securities c lassified as trading at September 30 , 2016 or December 31, 2015. The details for securities classified as available for sale with unrealized losses for the periods indicated follow.      Available for Sale  September 30, 2016 Losses < 12 months Losses 12 months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  Municipal obligations $ 69,801 409 $ — — $ 69,801 $ 409  Residential mortgage-backed securities 6,653 55 4,534 36 11,187 91  Commercial mortgage-backed securities 31,640 103 — — 31,640 103  Collateralized mortgage obligations 6,910 — — — 6,910 —  $ 115,004 $ 567 $ 4,534 $ 36 $ 119,538 $ 603      Available for Sale  December 31, 2015 Losses < 12 months Losses 12 months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  US Treasury and government agency securities $ — $ — $ 82 $ 1 $ 82 $ 1  Municipal obligations 8,296 38 — — 8,296 38  Residential mortgage-backed securities 831,156 8,257 116,126 2,925 947,282 11,182  Collateralized mortgage obligations 208,397 1,257 33,138 935 241,535 2,192  Equity securities 20 1 1,473 47 1,493 48  $ 1,047,869 $ 9,553 $ 150,819 $ 3,908 $ 1,198,688 $ 13,461  The details for securities classified as held to maturity with unrealized losses for the periods indicated follow.      Held to maturity  September 30, 2016 Losses < 12 months Losses 12 months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  Municipal obligations $ 98,295 $ 1,035 $ 11,843 $ 427 $ 110,138 $ 1,462  Collateralized mortgage obligations 119,172 146 132,960 1,293 252,132 1,439  $ 217,467 $ 1,181 $ 144,803 $ 1,720 $ 362,270 $ 2,901      Held to maturity  December 31, 2015 Losses < 12 months Losses 12 months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  U.S. Treasury and government agency securities $ 45,590 $ 410 $ — $ — $ 45,590 $ 410  Municipal obligations 22,652 301 48,727 865 71,379 1,166  Residential mortgage-backed securities 349,635 1,589 — — 349,635 1,589  Collateralized mortgage obligations 516,330 2,894 370,756 9,782 887,086 12,676  $ 934,207 $ 5,194 $ 419,483 $ 10,647 $ 1,353,690 $ 15,841 The unrealized losses primarily relate to changes in market rates on fixed-rate debt securities since the respective purchase dates. In all cases, the indicated impairment on these debt securities 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 issuer’s ability to meet contractual obligations. The Company believes it has adequate liquidity and, therefore, does not plan to and, more likely than not, will not be required to sell these securities before recovery of the indicated impairment. Accordingly, the unrealized losses on these securities have been determined to be temporary. Proceeds from the sales of securities were approximately $141.7 million with an associated realiz ed gain of $1.5 million and $9.3 million with an associated gain of $0.3 million for the nine months ended September 30, 2016 and 2015, respectively . Securities with carrying values totaling $3. 7 billion at September 30, 2016 and $3 . 5 billion at December 31, 2015 were pledged as collateral primarily to secure public deposits or securities sold under agreements to repurchase.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2016
Loans and Allowance for Loan Losses [Abstract]
Loans and Allowance for Loan Losses	3. Loans and Allowance for Loan Losses The presentation of loan disclosures has been modified from prior filings to eliminate segmentation of Acquired (2011 Whitney Holding Corporation transaction) and FDIC Acquired (2009 Peoples First Community Bank transaction) due to the significantly reduced size of these portfolios. The revised presentation reflects purchased credit impaired (“PCI”) loan information in select tables. PCI loans include the total FDIC Acquired portfolio and the portion of the Acquired portfolio deemed credit impaired at acquisition. In addition, the revised presentation includes further segmentation of the commercial real estate portfolio between owner occupied and income producing loans due to the significant differences in risk characteristics of these loans and to conform more closely to regulatory concentration segments and general industry practices. All prior period information has been reclassified to conform to the current period presentation. Loans, net of unearned income, by portfolio are presented in the table below .      September 30, December 31,  (in thousands) 2016 2015   Commercial non-real estate $ 7,133,928 $ 6,995,824  Commercial real estate - owner occupied 1,901,825 1,859,469  Total commercial & industrial 9,035,753 8,855,293  Commercial real estate - income producing 1,990,309 1,553,082  Construction and land development 946,592 1,151,950  Residential mortgages 2,037,162 2,049,524  Consumer 2,061,005 2,093,465  Total loans $ 16,070,821 $ 15,703,314  The following briefly describes the composition of each loan category.  Commercial and industrial  Commercial and industrial loans are made available to businesses for working capital (including financing of inventory and receivables), business expansion, to facilitate the acquisition of a business, and the purchase of equipment and machinery, including equipment leasing. These loans are primarily made based on the identified cash flows of the borrower and, when secured, have the added strength of the underlying collateral.  Commercial non-real estate loans may be secured by the assets being financed or other business assets such as accounts receivable, inventory, ownership or commodity interests, and may incorporate a personal or corporate guarantee; however, some short-term loans may be made on an unsecured basis, including a small portfolio of corporate credit cards, generally issued as a part of overall customer relationships.  Commercial real estate – owner occupied loans consist of commercial mortgages on properties where repayment is generally dependent on the cash flow from the ongoing operations and activities of the borrower. Like commercial non-real estate, these loans are primarily made based on the identified cash flows of the borrower, but also have the added strength of the value of underlying real estate collateral.  Commercial real estate – income producing  Commercial real estate – income producing loans consist of loans secured by commercial mortgages on properties where the loan is made to real estate developers or investors and repayment is dependent on the sale, refinance, or income generated from the operation of the property. Properties financed include retail, office, multifamily, senior housing, hotel/motel, skilled nursing facilities and other commercial properties.  Construction and land development  C onstruction and land development loans are made to facilitate t he acquisition, development, improvement and construction of both commercial and residential-purpose properties. Such loans are made to builders and investors where repayment is expected to be made from the sale, refinance or operation of the property or to businesses to be used in their business operations. This portfolio also includes a small amount of residential construction loans and loans secured by raw land not yet under development.  Residential Mortgages  Residential mortgages consist of closed-end loans secured by first liens on 1- 4 family residential properties. The portfolio includes both fixed and adjustable rate loans, although most longer-term, fixed-rate loans originated are sold in the secondary mortgage market .  Consumer  Consumer loans include second lien mortgage home loans, home equity lines of credit and nonresidential consumer purpose loans. Nonresidential consumer loans include both direct and indirect loans. Direct nonresidential consumer loans are made to finance the purchase of personal property, including automobiles, recreational vehicles and boats, and for other personal purposes (secured and unsecured), and deposit account secured loans. Indirect nonresidential loans include automobile financing provided to the consumer through an agreement with automobile dealerships. Consumer loans also include a small portfolio of credit card receivables issued on the basis of applications received through referrals from the Bank’s branches, online and other marketing efforts.   Allowance for Loan Losses The following schedule shows activity in the allowance for loan losses by portfolio class for the nine months ended September 30, 2016 and 2015, as well as the corresponding recorded investment in loans at the end of each period.      Commercial Commercial  Commercial real estate- Total real estate- Construction  non-real owner commercial & income and land Residential  (in thousands) estate occupied industrial producing development mortgages Consumer Total   Nine Months Ended September 30, 2016    Allowance for loan losses:  Beginning balance $ 109,428 $ 9,858 $ 119,286 $ 6,041 $ 5,642 $ 25,353 $ 24,857 $ 181,179  Purchased credit impaired activity:  Charge-offs — (28) (28) (1) (18) (91) (8) (146)  Recoveries 76 163 239 2 98 33 112 484  Net provision for loan losses 54 (140) (86) (436) (253) 1,685 (1,633) (723)  (Decrease) increase in FDIC loss share receivable (2) — (2) — — (3,341) 316 (3,027)  Non-purchased credit impaired activity:  Charge-offs (27,504) (1,660) (29,164) (191) (827) (908) (17,403) (48,493)  Recoveries 2,709 287 2,996 673 1,422 497 4,272 9,860  Net provision for loan losses 74,500 2,303 76,803 4,862 (216) 964 14,514 96,927  Ending balance $ 159,261 $ 10,783 $ 170,044 $ 10,950 $ 5,848 $ 24,192 $ 25,027 $ 236,061  Ending balance:  Allowance:  Individually evaluated for impairment $ 20,665 $ 223 $ 20,888 $ 57 $ 6 $ 94 $ 85 $ 21,130  Amounts related to purchased credit impaired loans 574 1,088 1,662 279 484 15,949 1,334 19,708  Collectively evaluated for impairment 138,022 9,472 147,494 10,614 5,358 8,149 23,608 195,223  Total allowance $ 159,261 $ 10,783 $ 170,044 $ 10,950 $ 5,848 $ 24,192 $ 25,027 $ 236,061  Loans:  Individually evaluated for impairment $ 235,039 $ 6,458 $ 241,497 $ 7,655 $ 2,062 $ 3,864 $ 1,485 $ 256,563  Purchased credit impaired loans 11,534 16,417 27,951 8,087 8,436 145,273 12,045 201,792  Collectively evaluated for impairment 6,887,355 1,878,950 8,766,305 1,974,567 936,094 1,888,025 2,047,475 15,612,466  Total loans $ 7,133,928 $ 1,901,825 9,035,753 $ 1,990,309 $ 946,592 $ 2,037,162 $ 2,061,005 $ 16,070,821        Commercial Commercial  Commercial real estate- Total real estate- Construction  non-real owner commercial & income and land Residential  (in thousands) estate occupied industrial producing development mortgages Consumer Total   Nine Months ended September 30, 2015    Allowance for loan losses:  Beginning balance $ 51,169 $ 13,536 $ 64,705 $ 7,546 $ 6,421 $ 28,660 $ 21,430 $ 128,762  Purchased credit impaired activity:  Charge-offs (1,425) (379) (1,804) (2,353) (406) (748) (140) (5,451)  Recoveries 1,699 937 2,636 20 896 5 185 3,742  Net provision for loan losses (950) (1,614) (2,564) 994 235 1,181 (1,232) (1,386)  Increase (decrease) in FDIC loss share receivable 314 (396) (82) 919 (6) (2,718) (97) (1,984)  Non-purchased credit impaired activity:  Charge-offs (3,068) (664) (3,732) (464) (1,483) (1,451) (10,431) (17,561)  Recoveries 2,589 249 2,838 386 2,006 578 3,418 9,226  Net provision for loan losses 13,594 2,436 16,030 (1,915) (289) 283 10,119 24,228  Ending balance $ 63,922 $ 14,105 $ 78,027 $ 5,133 $ 7,374 $ 25,790 $ 23,252 $ 139,576  Ending balance:  Allowance:  Individually evaluated for impairment $ 5,588 $ 2,723 $ 8,311 $ 187 $ 21 $ 96 $ 3 $ 8,618  Amounts related to purchased credit impaired loans 549 1,304 1,853 885 1,727 18,329 2,711 25,505  Collectively evaluated for impairment 57,785 10,078 67,863 4,061 5,626 7,365 20,538 105,453  Total allowance $ 63,922 $ 14,105 $ 78,027 $ 5,133 $ 7,374 $ 25,790 $ 23,252 $ 139,576  Loans:  Individually evaluated for impairment $ 75,345 $ 21,465 $ 96,810 $ 12,520 $ 2,053 $ 903 $ 157 $ 112,443  Purchased credit impaired loans 13,158 21,674 34,832 15,280 16,336 170,033 13,424 249,905  Collectively evaluated for impairment 6,257,491 1,800,015 8,057,506 1,456,432 1,067,196 1,842,853 1,976,715 14,400,702  Total loans $ 6,345,994 $ 1,843,154 8,189,148 $ 1,484,232 $ 1,085,585 $ 2,013,789 $ 1,990,296 $ 14,763,050    Impaired Loans The following table shows the composition of nonaccrual loans by portfolio class. Purchased credit impaired loans accounted for in pools with an accretable yield are considered to be performing and are excluded from the table.      September 30, December 31,  (in thousands) 2016 2015  Commercial non-real estate $ 240,298 $ 88,743  Commercial real estate - owner occupied 15,331 10,001  Total commercial & industrial 255,629 98,744  Commercial real estate - income producing 9,318 10,815  Construction and land development 4,930 17,294  Residential mortgages 21,181 23,799  Consumer 11,752 9,061  Total loans $ 302,810 $ 159,713  Nonaccrual loans include loans modified in troubled debt restructurings (“TDRs”) of $48.2 million and $8.8 million at September 30 , 2016 and December 31, 2015, respectively. Total TDRs, both accruing and nonaccruing, were $56.3 million as of September 30 , 2016 and $13.1 million at December 31, 2015. All TDRs are individually evaluated for impairment. The table below details TDRs that were modified during the nine months ended September 30, 2016 and September 30, 2015 by portfolio class .      Nine Months Ended  ($ in thousands) September 30, 2016 September 30, 2015  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  Commercial non-real estate 17 $ 57,915 $ 57,915 — $ — $ —  Commercial real estate - owner occupied — — — — — —  Total commercial & industrial 17 57,915 57,915 — — —  Commercial real estate - income producing — — — 1 482 482  Construction and land development — — — — — —  Residential mortgages 6 532 532 4 185 185  Consumer — — — 1 20 20  Total loans 23 $ 58,447 $ 58,447 6 $ 687 $ 687  The TDRs during the nine months ended September 30, 2016 reflected in the table above include $43.4 million of loans with extended amortization terms or other payment concessions, $14.7 million of loans with significant covenant waivers and $0.4 million with other modifications. The TDRs during the nine months ended September 30, 2015 include $0.7 million of loans with extended terms or other payment concessions and $0.1 million of other modifications. No TDRs that subsequently defaulted within twelve months of modification were recorded in the nine months ended September 30, 2016 or 2015. The tables below present loans that are individually evaluated for impairment disaggregated by portfolio class at September 30, 2016 and December 31, 2015 . Loans individually evaluated for impairment include TDRs and loans that are determined to be impaired and have aggregate relationship balances of $1 million or more.      September 30, 2016  Recorded investment Recorded investment Unpaid  (in thousands) without an allowance with an allowance principal balance Related allowance  Commercial non-real estate $ 118,527 $ 116,512 $ 247,732 $ 20,665  Commercial real estate - owner occupied 4,351 2,107 6,850 223  Total commercial & industrial 122,878 118,619 254,582 20,888  Commercial real estate - income producing 5,654 2,001 7,882 57  Construction and land development 1,228 834 2,905 6  Residential mortgages 2,908 956 4,382 94  Consumer — 1,485 1,485 85  Total loans $ 132,668 $ 123,895 $ 271,236 $ 21,130    December 31, 2015  Recorded investment Recorded investment Unpaid  (in thousands) without an allowance with an allowance principal balance Related allowance  Commercial non-real estate $ 34,788 $ 46,834 $ 84,988 $ 19,031  Commercial real estate - owner occupied 4,747 661 5,931 23  Total commercial & industrial 39,535 47,495 90,919 19,054  Commercial real estate - income producing 3,038 8,085 11,363 1,382  Construction and land development 12,461 1,765 14,784 392  Residential mortgages — 895 1,405 127  Consumer — 152 152 33  Total loans $ 55,034 $ 58,392 $ 118,623 $ 20,988      Three Months Ended  September 30, 2016 September 30, 2015  Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 233,913 $ 155 $ 53,862 $ 3  Commercial real estate - owner occupied 6,374 10 21,584 16  Total commercial & industrial 240,287 165 75,446 19  Commercial real estate - income producing 7,729 24 12,601 15  Construction and land development 1,655 — 3,207 7  Residential mortgages 2,466 3 1,136 1  Consumer 826 2 137 —  Total loans $ 252,963 $ 194 $ 92,527 $ 42      Nine Months Ended  September 30, 2016 September 30, 2015  Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 197,382 $ 1,002 $ 31,570 $ 6  Commercial real estate - owner occupied 6,015 39 14,836 40  Total commercial & industrial 203,397 1,041 46,406 46  Commercial real estate - income producing 8,624 67 10,905 56  Construction and land development 7,821 — 4,762 66  Residential mortgages 1,444 7 1,837 20  Consumer 348 4 101 3  Total loans $ 221,634 $ 1,119 $ 64,011 $ 191    Aging Analysis The tables below present the age analysis of past due loans by portfolio class at September 30, 2016 and December 31, 2015 . Purchased credit impaired loans accounted for in pools with an accretable yield are considered to be current.      Recorded  Greater than investment  30-59 days 60-89 days 90 days Total Total > 90 days and  September 30, 2016 past due past due past due past due Current Loans still accruing  (in thousands)  Commercial non-real estate $ 15,501 $ 24,566 $ 63,794 $ 103,861 $ 7,030,067 $ 7,133,928 $ 543  Commercial real estate - owner occupied 3,006 1,115 7,257 11,378 1,890,447 1,901,825 —  Total commercial & industrial 18,507 25,681 71,051 115,239 8,920,514 9,035,753 543  Commercial real estate - income producing 1,873 225 4,421 6,519 1,983,790 1,990,309 —  Construction and land development 1,069 1,565 7,358 9,992 936,600 946,592 3,501  Residential mortgages 23,067 6,771 11,541 41,379 1,995,783 2,037,162 —  Consumer 15,650 5,402 7,609 28,661 2,032,344 2,061,005 889  Total $ 60,166 $ 39,644 $ 101,980 $ 201,790 $ 15,869,031 $ 16,070,821 $ 4,933      Recorded  Greater than investment  30-59 days 60-89 days 90 days Total Total > 90 days and  December 31, 2015 past due past due past due past due Current Loans still accruing  (in thousands)  Commercial non-real estate $ 17,406 $ 1,468 $ 25,007 $ 43,881 $ 6,951,943 $ 6,995,824 $ 3,060  Commercial real estate - owner occupied 5,898 802 6,646 13,346 1,846,123 1,859,469 535  Total commercial & industrial 23,304 2,270 31,653 57,227 8,798,066 8,855,293 3,595  Commercial real estate - income producing 871 603 6,382 7,856 1,545,226 1,553,082 499  Construction and land development 19,886 436 4,043 24,365 1,127,585 1,151,950 1,230  Residential mortgages 18,657 4,360 11,840 34,857 2,014,667 2,049,524 163  Consumer 16,309 4,432 8,645 29,386 2,064,079 2,093,465 2,166  Total $ 79,027 $ 12,101 $ 62,563 $ 153,691 $ 15,549,623 $ 15,703,314 $ 7,653  Credit Quality Indicators The following tables present the credit quality indicators by segments and portfolio class of loans at September 30, 2016 and December 31, 2015 .      September 30, 2016  (in thousands) Commercial non-real estate Commercial real estate - owner-occupied Total commercial & industrial Commercial real estate - income producing Construction and land development Total commercial  Grade:  Pass $ 5,899,626 $ 1,721,031 $ 7,620,657 $ 1,876,423 $ 904,550 $ 10,401,630  Pass-Watch 180,467 42,727 223,194 69,773 21,945 314,912  Special Mention 196,408 32,046 228,454 6,100 198 234,752  Substandard 827,476 106,021 933,497 38,000 19,899 991,396  Doubtful 29,951 — 29,951 13 — 29,964  Total $ 7,133,928 $ 1,901,825 $ 9,035,753 $ 1,990,309 $ 946,592 $ 11,972,654   December 31, 2015  (in thousands) Commercial non-real estate Commercial real estate - owner-occupied Total commercial & industrial Commercial real estate - income producing Construction and land development Total commercial  Grade:  Pass $ 6,260,863 $ 1,718,725 $ 7,979,588 $ 1,502,484 $ 1,095,296 $ 10,577,368  Pass-Watch 168,589 31,764 200,353 14,717 6,841 221,911  Special Mention 211,230 41,147 252,377 5,905 12,297 270,579  Substandard 355,098 67,833 422,931 29,960 37,516 490,407  Doubtful 44 — 44 16 — 60  Total $ 6,995,824 $ 1,859,469 $ 8,855,293 $ 1,553,082 $ 1,151,950 $ 11,560,325       September 30, 2016 December 31, 2015  (in thousands) Residential mortgage Consumer Total Residential mortgage Consumer Total  Performing $ 2,015,981 $ 2,048,364 $ 4,064,345 $ 2,025,563 $ 2,082,238 $ 4,107,801  Nonperforming 21,181 12,641 33,822 23,961 11,227 35,188  Total $ 2,037,162 $ 2,061,005 $ 4,098,167 $ 2,049,524 $ 2,093,465 $ 4,142,989   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 have heightened risk factors that warrant additional monitoring; however, these risk factors have not manifested themselves as potential weaknesses. The “Watch” grade should be regarded as a transition category. · Special Mention – a criticized asset category defined as having potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may, at some future date, result in the deterioration of the repayment prospects for the credit or the institution’s credit position. Special mention credits are not considered part of the Classified credit categories and do not expose the institution to sufficient risk to warrant adverse classification. · Substandard – an asset that is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Assets so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. · Doubtful – an asset that has all the weaknesses inherent in one classified Substandard with the added characteristic that the weaknesses make collection nor liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. · Loss – credits classified as Loss are considered uncollectable and are charged off promptly once so classified. Residential and Consumer: · Performing – loans on which payments of principal and interest are less than 90 days past due. · Nonperforming – a nonperforming loan is a loan that is in default or close to being in default and there are good reasons to doubt that payments will be made in full. All loans rated as nonaccrual loans are also classified as nonperforming. Purchased credit impaired loans and the related FDIC loss share receivable  Loans purchased in the 2009 acquisition of Peoples First Community Bank (“Peoples First”) were covered by two loss share agreements between the FDIC and the Company. The loss share agreement covering the non-single family portfolio expired in December 2014 and is now in a three year recovery period where 80% of recoveries on reimbursed losses are shared with the FDIC. The loss share agreement covering the single family portfolio expires in December 2019. As of September 30, 2016 and September 30, 2015, loans totaling $152.3 million and $177.5 million, respectively, were covered by the single family loss share agreement.  The receivable arising from the loss share agreements (referred to as the “FDIC loss share receivable” on our consolidated statements of financial condition) is measured separately from the covered loans because the agreements are not contractually part of the loans and are not transferable should the Company choose to dispose of the loans. The following schedule shows activity in the loss share receivable for the nine months ended September 30, 2016 and 201 5 .      Nine Months Ended  September 30, September 30,  (in thousands) 2016 2015  Beginning Balance $ 29,868 $ 60,272  Amortization (4,678) (4,034)  Charge-offs, write-downs and other recoveries (5,569) (6,733)  External expenses qualifying under loss share agreement 1,000 1,035  Changes due to changes in cash flow projections (3,027) (1,984)  FDIC resolution of denied claims — (1,854)  Net payments to (from) FDIC 436 (14,667)  Ending balance $ 18,030 $ 32,035   Changes in the carrying amount of purchased credit impaired loans and related accretable yield are presented in the following table for the nine months ended September 30, 2016 and the year ended December 31, 2015 .      September 30, 2016 December 31, 2015  Carrying Carrying  Amount Accretable Amount Accretable  (in thousands) of Loans Yield of Loans Yield  Balance at beginning of period $ 225,838 $ 129,488 $ 313,685 $ 187,456  Payments received, net (39,446) (7,575) (115,847) (21,978)  Accretion 15,400 (15,400) 28,000 (28,000)  Increase (decrease) in expected cash flows based on actual cash flows and changes in cash flow assumptions — 5,352 — (4,238)  Net transfers to (from) nonaccretable difference to accretable yield — 10,675 — (3,752)  Balance at end of period $ 201,792 $ 122,540 $ 225,838 $ 129,488    Residential Mortgage Loans in Process of Foreclosure  Included in loans are $9.2 million and $7.4 million of consumer loans secured by single family residential real estate that are in process of foreclosure as of September 30, 2016 and December 31, 2015, respectively. Of these loans, $2.8 million and $4.1 million, respectively, are covered by the FDIC loss share agreement. Loans in process of foreclosure include those for which formal foreclosure proceedings are in process according to local requirements of the applicable jurisdiction. In addition to the single family residential real estate loans in process of foreclosure, the Company also held $4.5 million and $9.3 million of foreclosed single family residential properties in other real estate owned as of September 30, 2016 and December 31, 2015 , respectively. Of these foreclosed properties , $0.9 million and $1.6 million as of September 30, 2016 and December 31, 2015 , respectively, are also covered by the FDIC loss share agreement.

Securities Sold under Agreement

Securities Sold under Agreements to Repurchase	9 Months Ended
	Sep. 30, 2016
Securities Sold under Agreements to Repurchase [Abstract]
Securities Sold under Agreements to Repurchase	4. Securities Sold under Agreements to Repurchase Included in short - term borrowings at September 30, 2016 was $335.9 million of customer securities sold under agreements to repurchase (“repurchase agreements”) that mature daily and were secured by agency securities. The Company borrows funds on a secured basis by selling securities under agreements to repurchase, mai nly in connection with treasury management services offered to its deposit customers. As the Company maintains effective control over assets sold under agreements to repurchase, the securities continue to be carried on the consolidated statements of financial condition. Because the Company acts as borrower transferring assets to the counterparty, and the agreements mature d aily, the Company’s risk is limited.          

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2016
Long-Term Debt [Abstract]
Long-Term Debt	5. Long-Term Debt  Effective January 1, 2016, the Company retrospectively adopted accounting guidance intended to simplify the presentation of debt issuance costs by requiring that costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. Historically, debt issuance costs were reported in the “Other Assets” line items in the Consolidated Balance Sheets and Statements of Cash Flows. All historical periods have been restated to reflect the revised presentation and new required disclosures are reflected below. The adoption of this guidance did not have a material impact on the Company’s financial condition or operating results. Long-term debt consisted of the following .      September 30, December 31,  (in thousands) 2016 2015  Subordinated notes payable, maturing June 2045 $ 150,000 $ 150,000  Subordinated notes payable, maturing April 2017 95,511 98,011  Term note payable, maturing December 2018 111,575 125,000  Other long-term debt 112,266 122,988  Less unamortized debt issuance costs (5,642) (5,854)  Total long-term debt less unamortized debt issuance costs $ 463,710 $ 490,145  Long-term debt with its related unamortized debt issuance cost at September 30, 2016 is p resented in the following table.    Unamortized  Debt  Issuance  (in thousands) Principal Costs  Subordinated notes payable, maturing June 2045 $ 150,000 $ 5,000  Subordinated notes payable, maturing April 2017 95,511 -  Term note payable, maturing December 2018 111,575 642  Other long-term debt 112,266 -  Total $ 469,352 5,642  

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2016
Derivatives [Abstract]
Derivatives	6. 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 select pools of variable rate loans . The Bank has also entered into interest rate derivative agreements as a service to certain qualifying customers. The Bank manages a matched book with respect to these customer derivatives in order to minimize its net risk exposure resulting from such agreements. The Bank also enters into risk participation agreements under which it 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 of the Company’s derivative financial instruments as well as their classification on the consolidated balance sheets as of September 30, 2016 and December 31, 2015 .      Fair Values (1)  Notional Amounts Assets Liabilities  Type of September 30, December 31, September 30, December 31, September 30, December 31,  (in thousands) Hedge 2016 2015 2016 2015 2016 2015  Derivatives designated as hedging instruments:  Interest rate swaps Cash Flow $ 1,100,000 $ 500,000 $ 1,135 $ — $ 254 $ 281  $ 1,100,000 $ 500,000 $ 1,135 $ — $ 254 $ 281  Derivatives not designated as hedging instruments:  Interest rate swaps (2) N/A $ 905,662 $ 780,871 $ 33,732 $ 20,622 $ 35,447 $ 21,007  Risk participation agreements N/A 86,839 83,430 97 83 215 162  Forward commitments to sell residential mortgage loans N/A 102,495 55,128 88 263 997 336  Interest rate-lock commitments on residential mortgage loans N/A 60,757 38,853 532 243 33 167  Foreign exchange forward contracts N/A 29,700 44,068 970 2,040 953 2,015  $ 1,185,453 $ 1,002,350 $ 35,419 $ 23,251 $ 37,645 $ 23,687 (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 is party to eight interest rate swap agreements designated and qualify ing as cash flow hedges of the Company’s forec asted variable cash flows for pool s of variable rate loans. For each agreement, the Company receives interest at a fixed rate and p ays at a variable rate. The eight swap agreements expire as follows: notional amount of $300 million expires in January 2017 ; n otional amount of $200 million expires in June 2017 ; three contracts each with notional amounts of $100 million expire in April 2018 , 2019 , 2020 ; and three contracts each with notional amounts of $100 million expire in September 2018 , 2019 , 2020 . During the terms of the swap agreements, the effective portion of changes in the fair value of the derivative instruments are recorded in Accumulated Other Comprehensive Income (“AOCI”) and subsequently reclassified into earnings in the periods that the hedged forecasted variabl e-rate interest payments affect earnings . The impact on AOCI is reflected in Note 7. 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 derivative program The Bank enters into interest rate derivative agreements, primarily rate swaps, with commercial banking customers to facilitate their risk management strategies. The Bank enters 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 Bank also enters into risk participation agreements under which it may either assume or sell credit risk associated with a borrower’s performance under certain interest rate derivative contracts. In those instances where the Bank has assumed credit risk, it is not a direct counterparty to the derivative contract with the borrower and has entered into the risk participation agreement because it is a party to the related loan agreement with the borrower. In those instances in which the Bank has sold credit risk, it is the sole counterparty to the derivative contract with the borrower and has entered into the risk participation agreement because other banks participate in the related loan ag reement. The Bank manages its credit risk under risk participation agreements by monitoring the creditworthine ss of the borrower, based on the Bank’s normal credit review process. Mortgage banking derivatives The Bank also enters into certain deri vative 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 Bank enters into foreign exchange forward derivative agreements, primarily forward currency contracts, with commercial ban king customers to facilitate their risk management strategies. The Bank manages 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 Derivative income consisting primarily of customer interest rate swap fees, net of fair value adjustments, is reflected in the income statement in other noninterest income, totaling $1.7 million and $1.5 million for the nine months ended September 30, 2016 and 2015, respectively. The impact to interest income from cash flow hedges was $1.7 million and $1.5 million for the nine months ended September 30, 2016 and 2015, respectively. Credit risk-related Contingent Features Certain of the Bank’s derivative instruments contain provisions allowing the financial institution counterparty to terminate the contracts in certain circumstances, such as the downgrade of the Bank’s credit ratings below specified levels, a default by the Bank on its indebtedness, or the failure of the 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, 2016 , the aggregate fair value of derivative instruments with credit risk-related contingent features that were in a net liability position was $36.3 million, for which the Bank had posted collateral of $37.5 million . Offsetting Assets and Liabilities The Bank’s derivative instruments to certain counterparties contain legally enforceable netting provisions that allow for net settlement of multiple transactions to a single amount, which may be positive, negative, or zero. Offsetting information in regards to derivative assets and liabilities subject to these master netting agreements at September 30, 2016 and Decemb er 31, 2015 is presented in the following tables.      (in thousands) Gross Amounts Offset in Net Amounts Presented in Gross Amounts Not Offset in the Statement of Financial Position  Description Gross Amounts Recognized the Statement of Financial Position the Statement of Financial Position Financial Instruments Cash Collateral Net Amount  As of September 30, 2016  Derivative Assets $ 1,352 $ — $ 1,352 $ 1,352 $ — $ —   Derivative Liabilities $ 36,267 $ — $ 36,267 $ 1,352 $ 37,451 $ (2,536)      (in thousands) Gross Amounts Offset in Net Amounts Presented in Gross Amounts Not Offset in the Statement of Financial Position  Description Gross Amounts Recognized the Statement of Financial Position the Statement of Financial Position Financial Instruments Cash Collateral Net Amount  As of December 31, 2015  Derivative Assets $ 224 $ — $ 224 $ 224 $ — $ —   Derivative Liabilities $ 21,034 $ — $ 21,034 $ 224 $ 23,482 $ (2,672)  The Company has excess collateral compared to total exposure due to initial margin requirements for day-to-day rate volatility.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2016
Stockholders' Equity [Abstract]
Stockholders' Equity	 7. Stockholders’ Equity Stock Repurchase Program On August 28, 2015, the Company’s Board of D irectors approved a stock repurchase plan that authorized the repurchase of up to 5% , or approximately 3.9 million shares of its outstanding common stock. The approved plan allowed the Company to repurchase its common shares either in the open market in compliance with Rule 10b-18 promulgated under the Securities Exchange Act of 1934, as amended, or in privately negotiated transactions with non-affiliated sellers or as otherwise determined by the Company from time to time unt il it expired on September 30, 2016 . Under this plan, the Company repurchased 741,393 shares of its common stock at an average price of $27. 44 per share through September 30, 2016. There were no shares of common stock repurchased under this plan in 2016. 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. Net unrealized gains/losses on AFS securities reclassified as securities held to maturity (“HTM”) also continue to be reported as a component of AOCI and will be amortized 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.     Available HTM Securities Loss on  for Sale Transferred Employee Effective Cash  (in thousands) Securities from AFS Benefit Plans Flow Hedges Total  Balance, December 31, 2014 $ 18,001 $ (19,074) $ (48,626) $ (375) $ (50,074)  Other comprehensive income before income taxes:  Net change in unrealized gain 163 — — 2,011 2,174  Reclassification of net (gain) losses realized and included in earnings (165) — 2,373 — 2,208  Valuation adjustment for employee benefit plans — — (959) — (959)  Amortization of unrealized net loss on securities transferred to HTM — 2,609 — — 2,609  Income tax (benefit) expense (73) 953 513 732 2,125  Balance, September 30, 2015 $ 18,072 $ (17,418) $ (47,725) $ 904 $ (46,167)  Balance, December 31, 2015 $ 4,268 $ (16,795) $ (67,890) $ (178) $ (80,595)  Other comprehensive income before income taxes:  Net change in unrealized gain 38,835 — — 1,162 39,997  Reclassification of net (gain) losses realized and included in earnings (1,435) — 4,395 — 2,960  Valuation adjustment for employee benefit plans — — (6,347) (6,347)  Amortization of unrealized net loss on securities transferred to HTM — 2,736 — — 2,736  Income tax expense (benefit) 13,701 1,029 (714) 424 14,440  Balance, September 30, 2016 $ 27,967 $ (15,088) $ (69,128) $ 560 $ (55,689)  The following table shows the line items in the consolidated income statements affected by amounts reclassified from accumulated other comprehensive income.      Nine Months Ended  Amount reclassified from AOCI (a) September 30, Affected line item on  (in thousands) 2016 2015 the income statement  Gain on sale of AFS securities $ 1,435 $ 165 Securities transactions  Tax effect (502) (58) Income taxes  Net of tax 933 107 Net income  Amortization of unrealized net loss on securities transferred to HTM (2,736) (2,609) Interest income  Tax effect 1,029 953 Income taxes  Net of tax (1,707) (1,656) Net income  Amortization of defined benefit pension and post-retirement items (4,395) (2,373) Employee benefits expense (b)  Tax effect 1,538 831 Income taxes  Net of tax (2,857) (1,542) Net income  Total reclassifications, net of tax $ (3,631) $ (3,091) Net income  (a) Amounts in parenthesis indicate reduction in net income.  (b) 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 Note 11 for additional details).

Other Noninterest Income

Other Noninterest Income	9 Months Ended
	Sep. 30, 2016
Other Noninterest Income [Abstract]
Other Noninterest Income	8. Other Noninterest Income Components of other noninterest income are as follows.          Three Months Ended Nine Months Ended   September 30, September 30,   (in thousands) 2016 2015 2016 2015  Income from bank-owned life insurance $ 4,097 $ 2,451 $ 11,148 $ 7,788  Credit related fees 2,685 2,718 7,309 7,786  Derivative income 1,347 74 1,741 1,486  Net gain on sale of assets 991 418 4,557 363  Safety deposit box income 424 441 1,315 1,356  Other miscellaneous 2,322 2,268 6,698 7,360  Total other noninterest income $ 11,866 $ 8,370 $ 32,768 $ 26,139 

Other Noninterest Expense

Other Noninterest Expense	9 Months Ended
	Sep. 30, 2016
Other Noninterest Expense [Abstract]
Other Noninterest Expense	9. Other Noninterest Expense Components of other noninterest expense are as follows.      Three Months Ended Nine Months Ended  September 30, September 30,  (in thousands) 2016 2015 2016 2015  Advertising $ 2,859 $ 2,856 $ 7,909 $ 7,154  Ad valorem and franchise taxes 2,268 2,868 6,911 8,319  Printing and supplies 1,134 1,193 3,310 3,568  Insurance expense 803 794 2,467 2,644  Travel expense 1,022 1,419 3,050 3,946  Entertainment and contributions 1,686 1,634 5,319 5,009  Tax credit investment amortization 861 2,161 4,437 6,352  Other miscellaneous 11,746 3,634 22,158 16,679  Total other noninterest expense $ 22,379 $ 16,559 $ 55,561 $ 53,671 

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	10. 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. A summary of the information used in the computation of earnings per common share follows.     Three Months Ended Nine Months Ended  September 30, September 30,  (in thousands, except per share data) 2016 2015 2016 2015  Numerator:  Net income to common shareholders $ 46,719 $ 41,166 $ 97,465 $ 116,154  Net income allocated to participating securities - basic and diluted 1,101 840 2,334 2,541  Net income allocated to common shareholders - basic and diluted $ 45,618 $ 40,326 $ 95,131 $ 113,613  Denominator:  Weighted-average common shares - basic $ 77,550 $ 77,928 $ 77,525 $ 78,452  Dilutive potential common shares 127 147 128 157  Weighted-average common shares - diluted $ 77,677 $ 78,075 $ 77,653 $ 78,609  Earnings per common share:  Basic $ 0.59 $ 0.52 $ 1.23 $ 1.45  Diluted $ 0.59 $ 0.52 $ 1.23 $ 1.45  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 317,893 and 761,113 , respectively, for the three months ended September 30, 2016 and September 30, 2015. Weighted-average anti-dilutive potential common shares totaled 578,863 and 815,765 , respectively , for the nine months ended September 30, 2016 and September 30, 2015.

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2016
Retirement Plans [Abstract]
Retirement Plans	11. Retirement Plans The Company has a qualified defined benefit pension plan covering all eligible employees. Eligibility is based on minimum age-related and service-related requirements as well as job classification. Accrued benefits under a 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 tables show the components of net periodic benefits cost included in expense for the plans for the periods indicated.      Other Post-  (in thousands) Pension Benefits retirement Benefits   Three Months Ended September 30, 2016 2016 2015 2016 2015  Service cost $ 3,611 $ 3,383 $ 45 $ 23  Interest cost 4,022 4,672 204 174  Expected return on plan assets (8,554) (8,207) — —  Amortization of net loss 1,426 842 53 (40)  Net periodic benefit cost $ 505 $ 690 $ 302 $ 157   Nine Months Ended September 30, 2016  Service cost $ 10,487 $ 10,128 $ 119 $ 95  Interest cost 13,033 13,963 613 717  Expected return on plan assets (25,999) (24,626) — —  Amortization of net loss 4,320 2,328 75 45  Net periodic benefit cost $ 1,841 $ 1,793 $ 807 $ 857   No contribution is required in 2016 to meet minimum funding requirements, and the Company has no plans to make a contribution in the current year. The Company also provides a defined contribution 401(k) retirement benefit plan. Under the plan, the Company matches 100% of the first 1% of compensation saved by a participant, and 50% of the next 5% of compensation saved.

Share-Based Payment Arrangement

Share-Based Payment Arrangements	9 Months Ended
	Sep. 30, 2016
Share-Based Payment Arrangements [Abstract]
Share-Based Payment Arrangements	12. 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 16 to the consolidated financial statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 . A summary of option activity for the nine months ended September 30 , 201 6 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, 2016 745,806 $ 37.55  Exercised/Released (1,660) 29.73  Cancelled/Forfeited (66,345) 35.25  Expired (150,847) 46.06  Outstanding at September 30, 2016 526,954 $ 35.42 3.81 $ 582  Exercisable at September 30, 2016 483,199 $ 35.93 3.67 $ 469  The total intrins ic value of options exercised for the nine months ended September 30, 2016 was minimal, compared to $0.2 million for the nine months ended September 30, 2015 . The restricted and performance shares in the table below are subject to service requirements. A summary of the status of the Company’s nonvested restricted and performance shares as of September 30, 2016 and changes during the nine months ended September 30, 2016 , is presented in the following table.    Weighted  Average  Number of Grant Date  Shares Fair Value  Nonvested at January 1, 2016 2,196,145 $ 30.97  Granted 106,403 25.15  Vested (71,184) 30.98  Forfeited (207,932) 30.92  Nonvested at September 30, 2016 2,023,432 $ 30.63  As of September 30, 2016 , there were $33.6 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, 2016 and 2015 was $2.2 million and $7.6 million , respectively. During the nine months ended September 30, 2016 , the Company granted 35,587 performance shares subject to a total shareholder return ( “ TSR ” ) performance metric with a grant date fair value of $24.42 per share and 35,587 performance shares subject to a core earnings per share performance metric with a grant date fair value of $22.58 per share to key members of executive management. The number of performance shares subject to TSR that ultimately vest at the end of the three -year performance period, if any, will be based on the relative rank of the Company’s three -year TSR among the TSRs of a peer group of 44 regional banks. The fair value of the performance shares subject to TSR at the grant date was determined using a Monte Carlo simulation method. The number of performance shares subject to core earnings per share that ultimately vest will be based on the Company’s attainment of certain core earnings per share goals over the two -year performance period. The maximum number of performance shares that could vest is 200% of the target award. Compensation expense for these performance shares is recognized on a straight-line basis over the three -year service period.

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2016
Fair Value [Abstract]
Fair Value	13. 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 these 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 on a recurring basis in the consolidated balance sheets.     September 30, 2016  (in thousands) Level 1 Level 2 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 20,671 $ 20,671  Municipal obligations — 217,018 217,018  Corporate debt securities — 3,500 3,500  Residential mortgage-backed securities — 1,775,925 1,775,925  Commercial mortgage-backed securities — 173,109 173,109  Collateralized mortgage obligations — 223,256 223,256  Equity securities 1,201 — 1,201  Total available for sale securities 1,201 2,413,479 2,414,680  Derivative assets (1) — 36,554 36,554  Total recurring fair value measurements - assets $ 1,201 $ 2,450,033 $ 2,451,234  Liabilities  Derivative liabilities (1) $ — $ 37,899 $ 37,899  Total recurring fair value measurements - liabilities $ — $ 37,899 $ 37,899  (1) For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.      December 31, 2015  (in thousands) Level 1 Level 2 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 134 $ 134  Municipal obligations — 39,607 39,607  Corporate debt securities — 3,500 3,500  Residential mortgage-backed securities — 1,758,373 1,758,373  Collateralized mortgage obligations — 289,033 289,033  Equity securities 2,757 — 2,757  Total available for sale securities 2,757 2,090,647 2,093,404  Derivative assets (1) — 23,251 23,251  Total recurring fair value measurements - assets $ 2,757 $ 2,113,898 $ 2,116,655  Liabilities  Derivative liabilities (1) $ — $ 23,968 $ 23,968  Total recurring fair value measurements - liabilities $ — $ 23,968 $ 23,968  (1) For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.  Securities classified as level 1 within the valuation hierarchy include equity securities with fair value measurements obtained from quoted market prices on an active market . Level 2 classified securities include obligations of U.S. Government agencies and U.S. Government-sponsored agencies, 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 securities of investment grade quality with a targeted duration, for the overall portfolio, generally between two and five years . Company policies generally limit investments to agency securities and municipal securities determined to be investment grade according to an internally generated score which generally includes 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 customer interest rate swaps, is obtained from a third-party pricing service that uses an industry-standard discounted cash flow model that relies on inputs, LIBOR swap curves and Overnight Index swap rate 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, including those 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 Bank’s 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 is classified as a level 2 measurement. 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 independent 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 fair value information presented below is not as of the period-end, rather it was as of the date the fair value adjustment was recorded during the twelve months for each of the dates presented below, and excludes nonrecurring fair value measurements of assets no longer on the balance sheet. The following tables present the Company’s financial assets that are measured at fair value on a nonrecurring basis for each of the fair value hierarchy levels.      September 30, 2016  (in thousands) Level 1 Level 2 Level 3 Total  Collateral-dependent impaired loans $ — $ 126,401 $ — $ 126,401  Other real estate owned — — 14,626 14,626  Total nonrecurring fair value measurements $ — $ 126,401 $ 14,626 $ 141,027      December 31, 2015  (in thousands) Level 1 Level 2 Level 3 Total  Collateral-dependent impaired loans $ — $ 93,602 $ — $ 93,602  Other real estate owned — — 17,206 17,206  Total nonrecurring fair value measurements $ — $ 93,602 $ 17,206 $ 110,808  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 i nstruments 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 in the note. 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 in the note. For the remaining portfolio, fair values were generally determined by discounting scheduled cash flows using discount rates determined with reference to current market rates at which loans with similar terms would be made to borrowers of similar credit quality. Loans Held for Sale – These loans are recorded at fair value and carried at the lower of cost or market. The carrying amount is considered 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, Federal Funds Purchased, and Federal Home Loan Bank (“FHLB”) Borrowings - 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 in the note. 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, 2016 and December 31, 2015 .      September 30, 2016  Total Fair Carrying  (in thousands) Level 1 Level 2 Level 3 Value Amount  Financial assets:  Cash, interest-bearing bank deposits, and federal funds sold $ 458,792 $ — $ — $ 458,792 $ 458,792  Available for sale securities 1,201 2,413,479 — 2,414,680 2,414,680  Held to maturity securities — 2,482,540 — 2,482,540 2,428,432  Loans, net — 126,401 15,926,313 16,052,714 15,834,760  Loans held for sale — 42,545 — 42,545 42,545  Derivative financial instruments — 36,554 — 36,554 36,554  Financial liabilities:  Deposits $ — $ — $ 18,885,148 $ 18,885,148 $ 18,885,477  Federal funds purchased 1,250 — — 1,250 1,250  Securities sold under agreements to repurchase 335,894 — — 335,894 335,894  FHLB borrowings 738,812 — — 738,812 738,812  Long-term debt — 468,091 — 468,091 463,710  Derivative financial instruments — 37,899 — 37,899 37,899      December 31, 2015  Total Fair Carrying  (in thousands) Level 1 Level 2 Level 3 Value Amount  Financial assets:  Cash, interest-bearing bank deposits, and federal funds sold $ 869,429 $ — $ — $ 869,429 $ 869,429  Available for sale securities 2,757 2,090,647 — 2,093,404 2,093,404  Held to maturity securities — 2,375,851 — 2,375,851 2,370,388  Loans, net — 93,602 15,334,201 15,427,803 15,522,135  Loans held for sale — 20,434 — 20,434 20,434  Derivative financial instruments — 23,251 — 23,251 23,251  Financial liabilities:  Deposits $ — $ — $ 18,327,425 $ 18,327,425 $ 18,348,912  Federal funds purchased 10,100 — — 10,100 10,100  Securities sold under agreements to repurchase 513,544 — — 513,544 513,544  FHLB borrowings 900,000 — — 900,000 900,000  Long-term debt — 488,711 — 488,711 490,145  Derivative financial instruments — 23,968 — 23,968 23,968 

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2016
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	14. Recent Accounting Pronouncements  Accounting Standards Adopted in 2016 In February 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-02 “Consolidation (Topic 810): Amendments to the Consolidation Analysis” that changed the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The amendments in this ASU (1) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities; (2) eliminate the presumption that a general partner should consolidate a limited partnership; (3) affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships; and (4) provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments in this update were effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. The Company performed the consolidation analysis using the new guidelines effective as of January 1, 2016. The adoption of this guidance did not have a material impact on the Company’s financial condition or results of operations.  In April 2015, the FASB issued ASU 2015-03, “Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs to simplify presentation of debt issuance costs by requiring that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The guidance in this ASU does not address presentation or subsequent measurement of debt issuance costs related to line-of-credit arrangements. Therefore, the FASB issued ASU 2015-15, “Interest—Imputation of Interest (Subtopic 835-30) - Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements (Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting)” to clarify the SEC staff position that they would not object to an entity deferring and presenting debt issuance costs as an asset and subsequently amortizing the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. We adopted ASU 2015-03 and ASU 2015-15 on the first day of 2016 as required by the guidance and applied it retrospectively to the first day of 2012. Our adoption of this guidance did not have a material impact on the Company’s financial condition or results of operations. We retrospectively adjusted the balance sheet, statement of cash flows, long-term debt note and selected financial data. The effect of the change on the financial statement line items of Other Assets and Long-term Debt was immaterial (See Note 5). In April 2015, the FASB issued ASU 2015-05, Subtopic 350-40 “Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement” that provides guidance to customers about how to account for a cloud computing arrangement depending on whether or not it includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The guidance did not change GAAP for a customer’s accounting for service contracts. For public business entities, the amendments are effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015. The Company elected to adopt this guidance prospectively to all arrangements entered into or materially modified on or after the first day of 2016, as required by the guidance. The adoption of this guidance did not have a material impact on the Company’s financial condition or results of operations. In May 2015, the FASB issued ASU 2015-07, “Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)” that removed the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient and remove the requirement to make certain disclosures for all investments that are eligible to be measured at fair value using the net asset value per share practical expedient. The amendments in this update are effective for public business entities for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. The Company early adopted this guidance with the issuance of its benefit plan financials and it did not have a material impact on the Company’s financial condition or results of operations. In September 2015, the FASB issued ASU 2015-16 “Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments” that eliminates the requirement to restate prior period financial statements for measurement period adjustments. The new guidance requires that the cumulative impact of a measurement period adjustment (including the impact on prior periods) be recognized in the reporting period in which the adjustment is identified. The new standard should be applied prospectively to measurement period adjustments that occur after the effective date. The amendments in this update are effective for public business entities for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. The adoption of this guidance did not have a material impact on the Company’s financial condition or results of operations.   Issued but Not Yet Adopted Accounting Standards  In August 2016, the FASB issued ASU 2016-15, “Statement of Cash flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments,” to address diversity in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments provide guidance on eight specific cash flow issues, including debt prepayment or extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies (including bank-owned), life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. The amendments are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The amendments should be applied using a retrospective transition method to each period presented. The Company is currently assessing this pronouncement and the impact of adoption.  In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credits Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The ASU, more commonly referred to as Current Expected Credit Losses, or CECL, requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. The ASU is effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early application is permitted for all organizations for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company is currently assessing this pronouncement and the impact of adoption.  In March 2016, the FASB issued ASU 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” to improve the accounting for employee share-based payments. Several aspects of the accounting for share-based payment award transactions are simplified, including income tax consequences; classification of awards as either equity or liabilities; and classification on the statement of cash flows. The amendments are effective for public business entities for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted for any interim or annual period. The Company is currently assessing this pronouncement and the impact of adoption.  In February 2016, the FASB issued ASU 2016-02 “Leases (Topic 842)” that provides new lease accounting guidance. Under the guidance, lessees (with the exception of short-term leases) will be required to recognize a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessor accounting is largely unchanged. Lessees will need to recognize almost all leases on their balance sheet as a right-of-use asset and a lease liability. Lessees will no longer be provided with a source of off-balance sheet financing. Public business entities should apply the amendments for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is currently assessing this pronouncement and the impact of adoption.  In January 2016, the FASB issued an ASU 2016-01 “Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities” that improves the recognition and measurement of financial instruments through targeted changes to existing GAAP. It requires equity investments (except those that are accounted for under the equity method of accounting or result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. It also requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The amendments in this update are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is currently assessing this pronouncement , however, the adoption of this guidance is not expected to have a material impact on the Company’s financial condition or results of operations. In May 2014, the FASB issued ASU 2014-09 “Revenue from Contracts with Customers (Topic 606)” affecting any entity that enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards. The core principle of this standard is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Most revenue associated with financial instruments, including interest and loan origination fees, is outside the scope of the guidance. Gains and losses on investment securities, derivatives, and sales of financial instruments are also excluded from the scope. Subsequent to issuance of the revenue recognition guidance, the FASB has issued several updates that deferred by one year the effective date for revenue recognition guidance; clarified its guidance for performing the principal-versus-agent analysis; clarified guidance for identifying performance obligations allowing entities to ignore immaterial promised goods and services in the context of a contract with a customer and other clarifying guidance. Entities can elect to adopt the guidance either on a full or modified retrospective basis. Full retrospective adoption will require a cumulative effect adjustment to retained earnings as of the beginning of the earliest comparative period presented. Modified retrospective adoption will require a cumulative effect adjustment to retained earnings as of the beginning of the reporting period in which the entity first applies the new guidance. The standard will be effective for the Company for annual reporting periods beginning after Dece mber 15, 2017. The Company does not plan to early adopt the guidance. The Company is in the process of evaluating the transition method election and the impact of the guidance to noninterest income and on presentation and disclosures. This guidance is not expected to have a material impact on the Company’s financial condition or results of operations.      

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2016
Basis of Presentation [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. The Company has also evaluated all subsequent events for potential recognition and disclosure through the filing of this Form 10-Q. Some financial information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the 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 Annual Report on Form 10-K for the year ended December 31, 2015. 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. Certain prior period amounts have been reclassified to conform to the current period presentation. Beginning in the second quarter of 2016, the presentation of loan disclosures has been modified from prior filings as discussed in Note 3 – Loans and Allowance for Loan Losses. Effective January 1, 2016, the Company retrospectively adopted accounting guidance intended to simplify the presentation of debt issuance costs by requiring that costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. Historically, debt issuance costs were reported in the “Other Assets” line items in the Consolidated Balance Sheets and Statements of Cash Flows. All historical periods have been restated to reflect the revised presentation and new required disclosures. The adoption of this guidance did not have a material impact on the Company’s financial condition or operating results.
Use of Estimates	Use of Estimates The accounting principles the Company follows and the methods for applying these principles conform with GAAP and with general practices followed by 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	Critical Accounting Policies and Estimates There were no 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 its Annual Report on Form 10-K for the year ended December 31, 2015.

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2016
Gain (Loss) on Investments [Line Items]
Amortized Cost and Fair Value of Securities Available for Sale	   Securities Available for Sale  (in thousands) September 30, 2016 December 31, 2015  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 $ 20,604 $ 67 $ — $ 20,671 $ 135 $ — $ 1 $ 134  Municipal obligations 214,403 3,024 409 217,018 39,410 235 38 39,607  Residential mortgage-backed securities 1,737,812 38,204 91 1,775,925 1,750,168 19,387 11,182 1,758,373  Commercial mortgage-backed securities 172,525 687 103 173,109 — — — —  Collateralized mortgage obligations 220,912 2,344 — 223,256 291,085 140 2,192 289,033  Corporate debt securities 3,500 — — 3,500 3,500 — — 3,500  Equity securities 865 336 — 1,201 2,447 358 48 2,757  $ 2,370,621 $ 44,662 $ 603 $ 2,414,680 $ 2,086,745 $ 20,120 $ 13,461 $ 2,093,404 
Amortized Cost and Fair Value of Securities Held to Maturity	   Securities Held to Maturity  (in thousands) September 30, 2016 December 31, 2015  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 $ 50,000 $ 860 $ — $ 50,860 $ 50,000 $ — $ 410 $ 49,590  Municipal obligations 541,839 11,182 1,462 551,559 185,890 3,475 1,166 188,199  Residential mortgage-backed securities 903,703 36,200 — 939,903 1,014,135 15,585 1,589 1,028,131  Collateralized mortgage obligations 932,890 8,767 1,439 940,218 1,120,363 2,244 12,676 1,109,931  $ 2,428,432 $ 57,009 $ 2,901 $ 2,482,540 $ 2,370,388 $ 21,304 $ 15,841 $ 2,375,851 
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	   (in thousands) Amortized Fair  Debt Securities Available for Sale Cost Value  Due in one year or less $ 4,864 $ 4,900  Due after one year through five years 47,593 48,597  Due after five years through ten years 609,897 621,549  Due after ten years 1,707,402 1,738,433  Total available for sale debt securities $ 2,369,756 $ 2,413,479   Amortized Fair  Debt Securities Held to Maturity Cost Value  Due in one year or less $ 14,982 $ 15,019  Due after one year through five years 135,330 138,737  Due after five years through ten years 510,536 517,652  Due after ten years 1,767,584 1,811,132  Total held to maturity securities $ 2,428,432 $ 2,482,540 
Available for Sale [Member]
Gain (Loss) on Investments [Line Items]
Securities with Unrealized Losses	   Available for Sale  September 30, 2016 Losses < 12 months Losses 12 months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  Municipal obligations $ 69,801 409 $ — — $ 69,801 $ 409  Residential mortgage-backed securities 6,653 55 4,534 36 11,187 91  Commercial mortgage-backed securities 31,640 103 — — 31,640 103  Collateralized mortgage obligations 6,910 — — — 6,910 —  $ 115,004 $ 567 $ 4,534 $ 36 $ 119,538 $ 603      Available for Sale  December 31, 2015 Losses < 12 months Losses 12 months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  US Treasury and government agency securities $ — $ — $ 82 $ 1 $ 82 $ 1  Municipal obligations 8,296 38 — — 8,296 38  Residential mortgage-backed securities 831,156 8,257 116,126 2,925 947,282 11,182  Collateralized mortgage obligations 208,397 1,257 33,138 935 241,535 2,192  Equity securities 20 1 1,473 47 1,493 48  $ 1,047,869 $ 9,553 $ 150,819 $ 3,908 $ 1,198,688 $ 13,461 
Held to Maturity [Member]
Gain (Loss) on Investments [Line Items]
Securities with Unrealized Losses	   Held to maturity  September 30, 2016 Losses < 12 months Losses 12 months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  Municipal obligations $ 98,295 $ 1,035 $ 11,843 $ 427 $ 110,138 $ 1,462  Collateralized mortgage obligations 119,172 146 132,960 1,293 252,132 1,439  $ 217,467 $ 1,181 $ 144,803 $ 1,720 $ 362,270 $ 2,901      Held to maturity  December 31, 2015 Losses < 12 months Losses 12 months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  U.S. Treasury and government agency securities $ 45,590 $ 410 $ — $ — $ 45,590 $ 410  Municipal obligations 22,652 301 48,727 865 71,379 1,166  Residential mortgage-backed securities 349,635 1,589 — — 349,635 1,589  Collateralized mortgage obligations 516,330 2,894 370,756 9,782 887,086 12,676  $ 934,207 $ 5,194 $ 419,483 $ 10,647 $ 1,353,690 $ 15,841 

Loans and Allowance for Loan 25

Loans and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Net of Unearned Income	   September 30, December 31,  (in thousands) 2016 2015   Commercial non-real estate $ 7,133,928 $ 6,995,824  Commercial real estate - owner occupied 1,901,825 1,859,469  Total commercial & industrial 9,035,753 8,855,293  Commercial real estate - income producing 1,990,309 1,553,082  Construction and land development 946,592 1,151,950  Residential mortgages 2,037,162 2,049,524  Consumer 2,061,005 2,093,465  Total loans $ 16,070,821 $ 15,703,314 
Allowance for Loan Losses by Portfolio Class	   Commercial Commercial  Commercial real estate- Total real estate- Construction  non-real owner commercial & income and land Residential  (in thousands) estate occupied industrial producing development mortgages Consumer Total   Nine Months Ended September 30, 2016    Allowance for loan losses:  Beginning balance $ 109,428 $ 9,858 $ 119,286 $ 6,041 $ 5,642 $ 25,353 $ 24,857 $ 181,179  Purchased credit impaired activity:  Charge-offs — (28) (28) (1) (18) (91) (8) (146)  Recoveries 76 163 239 2 98 33 112 484  Net provision for loan losses 54 (140) (86) (436) (253) 1,685 (1,633) (723)  (Decrease) increase in FDIC loss share receivable (2) — (2) — — (3,341) 316 (3,027)  Non-purchased credit impaired activity:  Charge-offs (27,504) (1,660) (29,164) (191) (827) (908) (17,403) (48,493)  Recoveries 2,709 287 2,996 673 1,422 497 4,272 9,860  Net provision for loan losses 74,500 2,303 76,803 4,862 (216) 964 14,514 96,927  Ending balance $ 159,261 $ 10,783 $ 170,044 $ 10,950 $ 5,848 $ 24,192 $ 25,027 $ 236,061  Ending balance:  Allowance:  Individually evaluated for impairment $ 20,665 $ 223 $ 20,888 $ 57 $ 6 $ 94 $ 85 $ 21,130  Amounts related to purchased credit impaired loans 574 1,088 1,662 279 484 15,949 1,334 19,708  Collectively evaluated for impairment 138,022 9,472 147,494 10,614 5,358 8,149 23,608 195,223  Total allowance $ 159,261 $ 10,783 $ 170,044 $ 10,950 $ 5,848 $ 24,192 $ 25,027 $ 236,061  Loans:  Individually evaluated for impairment $ 235,039 $ 6,458 $ 241,497 $ 7,655 $ 2,062 $ 3,864 $ 1,485 $ 256,563  Purchased credit impaired loans 11,534 16,417 27,951 8,087 8,436 145,273 12,045 201,792  Collectively evaluated for impairment 6,887,355 1,878,950 8,766,305 1,974,567 936,094 1,888,025 2,047,475 15,612,466  Total loans $ 7,133,928 $ 1,901,825 9,035,753 $ 1,990,309 $ 946,592 $ 2,037,162 $ 2,061,005 $ 16,070,821        Commercial Commercial  Commercial real estate- Total real estate- Construction  non-real owner commercial & income and land Residential  (in thousands) estate occupied industrial producing development mortgages Consumer Total   Nine Months ended September 30, 2015    Allowance for loan losses:  Beginning balance $ 51,169 $ 13,536 $ 64,705 $ 7,546 $ 6,421 $ 28,660 $ 21,430 $ 128,762  Purchased credit impaired activity:  Charge-offs (1,425) (379) (1,804) (2,353) (406) (748) (140) (5,451)  Recoveries 1,699 937 2,636 20 896 5 185 3,742  Net provision for loan losses (950) (1,614) (2,564) 994 235 1,181 (1,232) (1,386)  Increase (decrease) in FDIC loss share receivable 314 (396) (82) 919 (6) (2,718) (97) (1,984)  Non-purchased credit impaired activity:  Charge-offs (3,068) (664) (3,732) (464) (1,483) (1,451) (10,431) (17,561)  Recoveries 2,589 249 2,838 386 2,006 578 3,418 9,226  Net provision for loan losses 13,594 2,436 16,030 (1,915) (289) 283 10,119 24,228  Ending balance $ 63,922 $ 14,105 $ 78,027 $ 5,133 $ 7,374 $ 25,790 $ 23,252 $ 139,576  Ending balance:  Allowance:  Individually evaluated for impairment $ 5,588 $ 2,723 $ 8,311 $ 187 $ 21 $ 96 $ 3 $ 8,618  Amounts related to purchased credit impaired loans 549 1,304 1,853 885 1,727 18,329 2,711 25,505  Collectively evaluated for impairment 57,785 10,078 67,863 4,061 5,626 7,365 20,538 105,453  Total allowance $ 63,922 $ 14,105 $ 78,027 $ 5,133 $ 7,374 $ 25,790 $ 23,252 $ 139,576  Loans:  Individually evaluated for impairment $ 75,345 $ 21,465 $ 96,810 $ 12,520 $ 2,053 $ 903 $ 157 $ 112,443  Purchased credit impaired loans 13,158 21,674 34,832 15,280 16,336 170,033 13,424 249,905  Collectively evaluated for impairment 6,257,491 1,800,015 8,057,506 1,456,432 1,067,196 1,842,853 1,976,715 14,400,702  Total loans $ 6,345,994 $ 1,843,154 8,189,148 $ 1,484,232 $ 1,085,585 $ 2,013,789 $ 1,990,296 $ 14,763,050  
Composition of Nonaccrual Loans by Portfolio Class	   September 30, December 31,  (in thousands) 2016 2015  Commercial non-real estate $ 240,298 $ 88,743  Commercial real estate - owner occupied 15,331 10,001  Total commercial & industrial 255,629 98,744  Commercial real estate - income producing 9,318 10,815  Construction and land development 4,930 17,294  Residential mortgages 21,181 23,799  Consumer 11,752 9,061  Total loans $ 302,810 $ 159,713 
Troubled Debt Restructurings Modified by Portfolio Class	   Nine Months Ended  ($ in thousands) September 30, 2016 September 30, 2015  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  Commercial non-real estate 17 $ 57,915 $ 57,915 — $ — $ —  Commercial real estate - owner occupied — — — — — —  Total commercial & industrial 17 57,915 57,915 — — —  Commercial real estate - income producing — — — 1 482 482  Construction and land development — — — — — —  Residential mortgages 6 532 532 4 185 185  Consumer — — — 1 20 20  Total loans 23 $ 58,447 $ 58,447 6 $ 687 $ 687 
Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class	   September 30, 2016  Recorded investment Recorded investment Unpaid  (in thousands) without an allowance with an allowance principal balance Related allowance  Commercial non-real estate $ 118,527 $ 116,512 $ 247,732 $ 20,665  Commercial real estate - owner occupied 4,351 2,107 6,850 223  Total commercial & industrial 122,878 118,619 254,582 20,888  Commercial real estate - income producing 5,654 2,001 7,882 57  Construction and land development 1,228 834 2,905 6  Residential mortgages 2,908 956 4,382 94  Consumer — 1,485 1,485 85  Total loans $ 132,668 $ 123,895 $ 271,236 $ 21,130    December 31, 2015  Recorded investment Recorded investment Unpaid  (in thousands) without an allowance with an allowance principal balance Related allowance  Commercial non-real estate $ 34,788 $ 46,834 $ 84,988 $ 19,031  Commercial real estate - owner occupied 4,747 661 5,931 23  Total commercial & industrial 39,535 47,495 90,919 19,054  Commercial real estate - income producing 3,038 8,085 11,363 1,382  Construction and land development 12,461 1,765 14,784 392  Residential mortgages — 895 1,405 127  Consumer — 152 152 33  Total loans $ 55,034 $ 58,392 $ 118,623 $ 20,988      Three Months Ended  September 30, 2016 September 30, 2015  Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 233,913 $ 155 $ 53,862 $ 3  Commercial real estate - owner occupied 6,374 10 21,584 16  Total commercial & industrial 240,287 165 75,446 19  Commercial real estate - income producing 7,729 24 12,601 15  Construction and land development 1,655 — 3,207 7  Residential mortgages 2,466 3 1,136 1  Consumer 826 2 137 —  Total loans $ 252,963 $ 194 $ 92,527 $ 42      Nine Months Ended  September 30, 2016 September 30, 2015  Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 197,382 $ 1,002 $ 31,570 $ 6  Commercial real estate - owner occupied 6,015 39 14,836 40  Total commercial & industrial 203,397 1,041 46,406 46  Commercial real estate - income producing 8,624 67 10,905 56  Construction and land development 7,821 — 4,762 66  Residential mortgages 1,444 7 1,837 20  Consumer 348 4 101 3  Total loans $ 221,634 $ 1,119 $ 64,011 $ 191 
Age Analysis of Past Due Loans by Portfolio Class	   Recorded  Greater than investment  30-59 days 60-89 days 90 days Total Total > 90 days and  September 30, 2016 past due past due past due past due Current Loans still accruing  (in thousands)  Commercial non-real estate $ 15,501 $ 24,566 $ 63,794 $ 103,861 $ 7,030,067 $ 7,133,928 $ 543  Commercial real estate - owner occupied 3,006 1,115 7,257 11,378 1,890,447 1,901,825 —  Total commercial & industrial 18,507 25,681 71,051 115,239 8,920,514 9,035,753 543  Commercial real estate - income producing 1,873 225 4,421 6,519 1,983,790 1,990,309 —  Construction and land development 1,069 1,565 7,358 9,992 936,600 946,592 3,501  Residential mortgages 23,067 6,771 11,541 41,379 1,995,783 2,037,162 —  Consumer 15,650 5,402 7,609 28,661 2,032,344 2,061,005 889  Total $ 60,166 $ 39,644 $ 101,980 $ 201,790 $ 15,869,031 $ 16,070,821 $ 4,933      Recorded  Greater than investment  30-59 days 60-89 days 90 days Total Total > 90 days and  December 31, 2015 past due past due past due past due Current Loans still accruing  (in thousands)  Commercial non-real estate $ 17,406 $ 1,468 $ 25,007 $ 43,881 $ 6,951,943 $ 6,995,824 $ 3,060  Commercial real estate - owner occupied 5,898 802 6,646 13,346 1,846,123 1,859,469 535  Total commercial & industrial 23,304 2,270 31,653 57,227 8,798,066 8,855,293 3,595  Commercial real estate - income producing 871 603 6,382 7,856 1,545,226 1,553,082 499  Construction and land development 19,886 436 4,043 24,365 1,127,585 1,151,950 1,230  Residential mortgages 18,657 4,360 11,840 34,857 2,014,667 2,049,524 163  Consumer 16,309 4,432 8,645 29,386 2,064,079 2,093,465 2,166  Total $ 79,027 $ 12,101 $ 62,563 $ 153,691 $ 15,549,623 $ 15,703,314 $ 7,653 
Activity in Loss Share Receivable	   Nine Months Ended  September 30, September 30,  (in thousands) 2016 2015  Beginning Balance $ 29,868 $ 60,272  Amortization (4,678) (4,034)  Charge-offs, write-downs and other recoveries (5,569) (6,733)  External expenses qualifying under loss share agreement 1,000 1,035  Changes due to changes in cash flow projections (3,027) (1,984)  FDIC resolution of denied claims — (1,854)  Net payments to (from) FDIC 436 (14,667)  Ending balance $ 18,030 $ 32,035 
Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield	   September 30, 2016 December 31, 2015  Carrying Carrying  Amount Accretable Amount Accretable  (in thousands) of Loans Yield of Loans Yield  Balance at beginning of period $ 225,838 $ 129,488 $ 313,685 $ 187,456  Payments received, net (39,446) (7,575) (115,847) (21,978)  Accretion 15,400 (15,400) 28,000 (28,000)  Increase (decrease) in expected cash flows based on actual cash flows and changes in cash flow assumptions — 5,352 — (4,238)  Net transfers to (from) nonaccretable difference to accretable yield — 10,675 — (3,752)  Balance at end of period $ 201,792 $ 122,540 $ 225,838 $ 129,488 
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit Quality Indicators by Segments and Portfolio Class	   September 30, 2016  (in thousands) Commercial non-real estate Commercial real estate - owner-occupied Total commercial & industrial Commercial real estate - income producing Construction and land development Total commercial  Grade:  Pass $ 5,899,626 $ 1,721,031 $ 7,620,657 $ 1,876,423 $ 904,550 $ 10,401,630  Pass-Watch 180,467 42,727 223,194 69,773 21,945 314,912  Special Mention 196,408 32,046 228,454 6,100 198 234,752  Substandard 827,476 106,021 933,497 38,000 19,899 991,396  Doubtful 29,951 — 29,951 13 — 29,964  Total $ 7,133,928 $ 1,901,825 $ 9,035,753 $ 1,990,309 $ 946,592 $ 11,972,654   December 31, 2015  (in thousands) Commercial non-real estate Commercial real estate - owner-occupied Total commercial & industrial Commercial real estate - income producing Construction and land development Total commercial  Grade:  Pass $ 6,260,863 $ 1,718,725 $ 7,979,588 $ 1,502,484 $ 1,095,296 $ 10,577,368  Pass-Watch 168,589 31,764 200,353 14,717 6,841 221,911  Special Mention 211,230 41,147 252,377 5,905 12,297 270,579  Substandard 355,098 67,833 422,931 29,960 37,516 490,407  Doubtful 44 — 44 16 — 60  Total $ 6,995,824 $ 1,859,469 $ 8,855,293 $ 1,553,082 $ 1,151,950 $ 11,560,325 
Residential Mortgages and Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit Quality Indicators by Segments and Portfolio Class	   September 30, 2016 December 31, 2015  (in thousands) Residential mortgage Consumer Total Residential mortgage Consumer Total  Performing $ 2,015,981 $ 2,048,364 $ 4,064,345 $ 2,025,563 $ 2,082,238 $ 4,107,801  Nonperforming 21,181 12,641 33,822 23,961 11,227 35,188  Total $ 2,037,162 $ 2,061,005 $ 4,098,167 $ 2,049,524 $ 2,093,465 $ 4,142,989 

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2016
Long-Term Debt [Abstract]
Long-Term Debt	Long-term debt consisted of the following .      September 30, December 31,  (in thousands) 2016 2015  Subordinated notes payable, maturing June 2045 $ 150,000 $ 150,000  Subordinated notes payable, maturing April 2017 95,511 98,011  Term note payable, maturing December 2018 111,575 125,000  Other long-term debt 112,266 122,988  Less unamortized debt issuance costs (5,642) (5,854)  Total long-term debt less unamortized debt issuance costs $ 463,710 $ 490,145  Long-term debt with its related unamortized debt issuance cost at September 30, 2016 is p resented in the following table.    Unamortized  Debt  Issuance  (in thousands) Principal Costs  Subordinated notes payable, maturing June 2045 $ 150,000 $ 5,000  Subordinated notes payable, maturing April 2017 95,511 -  Term note payable, maturing December 2018 111,575 642  Other long-term debt 112,266 -  Total $ 469,352 5,642 

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2016
Derivatives [Abstract]
Fair Values of Derivative Financial Instruments	   Fair Values (1)  Notional Amounts Assets Liabilities  Type of September 30, December 31, September 30, December 31, September 30, December 31,  (in thousands) Hedge 2016 2015 2016 2015 2016 2015  Derivatives designated as hedging instruments:  Interest rate swaps Cash Flow $ 1,100,000 $ 500,000 $ 1,135 $ — $ 254 $ 281  $ 1,100,000 $ 500,000 $ 1,135 $ — $ 254 $ 281  Derivatives not designated as hedging instruments:  Interest rate swaps (2) N/A $ 905,662 $ 780,871 $ 33,732 $ 20,622 $ 35,447 $ 21,007  Risk participation agreements N/A 86,839 83,430 97 83 215 162  Forward commitments to sell residential mortgage loans N/A 102,495 55,128 88 263 997 336  Interest rate-lock commitments on residential mortgage loans N/A 60,757 38,853 532 243 33 167  Foreign exchange forward contracts N/A 29,700 44,068 970 2,040 953 2,015  $ 1,185,453 $ 1,002,350 $ 35,419 $ 23,251 $ 37,645 $ 23,687 (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 Subject to Master Netting Arrangements	   (in thousands) Gross Amounts Offset in Net Amounts Presented in Gross Amounts Not Offset in the Statement of Financial Position  Description Gross Amounts Recognized the Statement of Financial Position the Statement of Financial Position Financial Instruments Cash Collateral Net Amount  As of September 30, 2016  Derivative Assets $ 1,352 $ — $ 1,352 $ 1,352 $ — $ —   Derivative Liabilities $ 36,267 $ — $ 36,267 $ 1,352 $ 37,451 $ (2,536)      (in thousands) Gross Amounts Offset in Net Amounts Presented in Gross Amounts Not Offset in the Statement of Financial Position  Description Gross Amounts Recognized the Statement of Financial Position the Statement of Financial Position Financial Instruments Cash Collateral Net Amount  As of December 31, 2015  Derivative Assets $ 224 $ — $ 224 $ 224 $ — $ —   Derivative Liabilities $ 21,034 $ — $ 21,034 $ 224 $ 23,482 $ (2,672) 

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2016
Stockholders' Equity [Abstract]
Components of Accumulated Other Comprehensive Income (Loss)	   Available HTM Securities Loss on  for Sale Transferred Employee Effective Cash  (in thousands) Securities from AFS Benefit Plans Flow Hedges Total  Balance, December 31, 2014 $ 18,001 $ (19,074) $ (48,626) $ (375) $ (50,074)  Other comprehensive income before income taxes:  Net change in unrealized gain 163 — — 2,011 2,174  Reclassification of net (gain) losses realized and included in earnings (165) — 2,373 — 2,208  Valuation adjustment for employee benefit plans — — (959) — (959)  Amortization of unrealized net loss on securities transferred to HTM — 2,609 — — 2,609  Income tax (benefit) expense (73) 953 513 732 2,125  Balance, September 30, 2015 $ 18,072 $ (17,418) $ (47,725) $ 904 $ (46,167)  Balance, December 31, 2015 $ 4,268 $ (16,795) $ (67,890) $ (178) $ (80,595)  Other comprehensive income before income taxes:  Net change in unrealized gain 38,835 — — 1,162 39,997  Reclassification of net (gain) losses realized and included in earnings (1,435) — 4,395 — 2,960  Valuation adjustment for employee benefit plans — — (6,347) (6,347)  Amortization of unrealized net loss on securities transferred to HTM — 2,736 — — 2,736  Income tax expense (benefit) 13,701 1,029 (714) 424 14,440  Balance, September 30, 2016 $ 27,967 $ (15,088) $ (69,128) $ 560 $ (55,689) 
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income	   Nine Months Ended  Amount reclassified from AOCI (a) September 30, Affected line item on  (in thousands) 2016 2015 the income statement  Gain on sale of AFS securities $ 1,435 $ 165 Securities transactions  Tax effect (502) (58) Income taxes  Net of tax 933 107 Net income  Amortization of unrealized net loss on securities transferred to HTM (2,736) (2,609) Interest income  Tax effect 1,029 953 Income taxes  Net of tax (1,707) (1,656) Net income  Amortization of defined benefit pension and post-retirement items (4,395) (2,373) Employee benefits expense (b)  Tax effect 1,538 831 Income taxes  Net of tax (2,857) (1,542) Net income  Total reclassifications, net of tax $ (3,631) $ (3,091) Net income  (a) Amounts in parenthesis indicate reduction in net income.  (b) 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 Note 11 for additional details).

Other Noninterest Income (Table

Other Noninterest Income (Tables)	9 Months Ended
	Sep. 30, 2016
Other Noninterest Income [Abstract]
Components of Other Noninterest Income	   Three Months Ended Nine Months Ended   September 30, September 30,   (in thousands) 2016 2015 2016 2015  Income from bank-owned life insurance $ 4,097 $ 2,451 $ 11,148 $ 7,788  Credit related fees 2,685 2,718 7,309 7,786  Derivative income 1,347 74 1,741 1,486  Net gain on sale of assets 991 418 4,557 363  Safety deposit box income 424 441 1,315 1,356  Other miscellaneous 2,322 2,268 6,698 7,360  Total other noninterest income $ 11,866 $ 8,370 $ 32,768 $ 26,139 

Other Noninterest Expense (Tabl

Other Noninterest Expense (Tables)	9 Months Ended
	Sep. 30, 2016
Other Noninterest Expense [Abstract]
Components of Other Noninterest Expense	   Three Months Ended Nine Months Ended  September 30, September 30,  (in thousands) 2016 2015 2016 2015  Advertising $ 2,859 $ 2,856 $ 7,909 $ 7,154  Ad valorem and franchise taxes 2,268 2,868 6,911 8,319  Printing and supplies 1,134 1,193 3,310 3,568  Insurance expense 803 794 2,467 2,644  Travel expense 1,022 1,419 3,050 3,946  Entertainment and contributions 1,686 1,634 5,319 5,009  Tax credit investment amortization 861 2,161 4,437 6,352  Other miscellaneous 11,746 3,634 22,158 16,679  Total other noninterest expense $ 22,379 $ 16,559 $ 55,561 $ 53,671 

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Computation of Earnings Per Common Share	   Three Months Ended Nine Months Ended  September 30, September 30,  (in thousands, except per share data) 2016 2015 2016 2015  Numerator:  Net income to common shareholders $ 46,719 $ 41,166 $ 97,465 $ 116,154  Net income allocated to participating securities - basic and diluted 1,101 840 2,334 2,541  Net income allocated to common shareholders - basic and diluted $ 45,618 $ 40,326 $ 95,131 $ 113,613  Denominator:  Weighted-average common shares - basic $ 77,550 $ 77,928 $ 77,525 $ 78,452  Dilutive potential common shares 127 147 128 157  Weighted-average common shares - diluted $ 77,677 $ 78,075 $ 77,653 $ 78,609  Earnings per common share:  Basic $ 0.59 $ 0.52 $ 1.23 $ 1.45  Diluted $ 0.59 $ 0.52 $ 1.23 $ 1.45 

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2016
Retirement Plans [Abstract]
Components of Net Periodic Benefits Cost	   Other Post-  (in thousands) Pension Benefits retirement Benefits   Three Months Ended September 30, 2016 2016 2015 2016 2015  Service cost $ 3,611 $ 3,383 $ 45 $ 23  Interest cost 4,022 4,672 204 174  Expected return on plan assets (8,554) (8,207) — —  Amortization of net loss 1,426 842 53 (40)  Net periodic benefit cost $ 505 $ 690 $ 302 $ 157   Nine Months Ended September 30, 2016  Service cost $ 10,487 $ 10,128 $ 119 $ 95  Interest cost 13,033 13,963 613 717  Expected return on plan assets (25,999) (24,626) — —  Amortization of net loss 4,320 2,328 75 45  Net periodic benefit cost $ 1,841 $ 1,793 $ 807 $ 857 

Share-Based Payment Arrangeme33

Share-Based Payment Arrangements (Tables)	9 Months Ended
	Sep. 30, 2016
Share-Based Payment Arrangements [Abstract]
Summary of Option Activity	   Weighted  Average  Weighted Remaining  Average Contractual Aggregate  Number of Exercise Term Intrinsic  Options Shares Price (Years) Value ($000)  Outstanding at January 1, 2016 745,806 $ 37.55  Exercised/Released (1,660) 29.73  Cancelled/Forfeited (66,345) 35.25  Expired (150,847) 46.06  Outstanding at September 30, 2016 526,954 $ 35.42 3.81 $ 582  Exercisable at September 30, 2016 483,199 $ 35.93 3.67 $ 469 
Summary of Nonvested Restricted and Performance Shares	   Weighted  Average  Number of Grant Date  Shares Fair Value  Nonvested at January 1, 2016 2,196,145 $ 30.97  Granted 106,403 25.15  Vested (71,184) 30.98  Forfeited (207,932) 30.92  Nonvested at September 30, 2016 2,023,432 $ 30.63 

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	   September 30, 2016  (in thousands) Level 1 Level 2 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 20,671 $ 20,671  Municipal obligations — 217,018 217,018  Corporate debt securities — 3,500 3,500  Residential mortgage-backed securities — 1,775,925 1,775,925  Commercial mortgage-backed securities — 173,109 173,109  Collateralized mortgage obligations — 223,256 223,256  Equity securities 1,201 — 1,201  Total available for sale securities 1,201 2,413,479 2,414,680  Derivative assets (1) — 36,554 36,554  Total recurring fair value measurements - assets $ 1,201 $ 2,450,033 $ 2,451,234  Liabilities  Derivative liabilities (1) $ — $ 37,899 $ 37,899  Total recurring fair value measurements - liabilities $ — $ 37,899 $ 37,899  (1) For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.      December 31, 2015  (in thousands) Level 1 Level 2 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 134 $ 134  Municipal obligations — 39,607 39,607  Corporate debt securities — 3,500 3,500  Residential mortgage-backed securities — 1,758,373 1,758,373  Collateralized mortgage obligations — 289,033 289,033  Equity securities 2,757 — 2,757  Total available for sale securities 2,757 2,090,647 2,093,404  Derivative assets (1) — 23,251 23,251  Total recurring fair value measurements - assets $ 2,757 $ 2,113,898 $ 2,116,655  Liabilities  Derivative liabilities (1) $ — $ 23,968 $ 23,968  Total recurring fair value measurements - liabilities $ — $ 23,968 $ 23,968  (1) For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives. 
Financial Assets Measured at Fair Value on Nonrecurring Basis	   September 30, 2016  (in thousands) Level 1 Level 2 Level 3 Total  Collateral-dependent impaired loans $ — $ 126,401 $ — $ 126,401  Other real estate owned — — 14,626 14,626  Total nonrecurring fair value measurements $ — $ 126,401 $ 14,626 $ 141,027      December 31, 2015  (in thousands) Level 1 Level 2 Level 3 Total  Collateral-dependent impaired loans $ — $ 93,602 $ — $ 93,602  Other real estate owned — — 17,206 17,206  Total nonrecurring fair value measurements $ — $ 93,602 $ 17,206 $ 110,808 
Estimated Fair Values of Financial Instruments	   September 30, 2016  Total Fair Carrying  (in thousands) Level 1 Level 2 Level 3 Value Amount  Financial assets:  Cash, interest-bearing bank deposits, and federal funds sold $ 458,792 $ — $ — $ 458,792 $ 458,792  Available for sale securities 1,201 2,413,479 — 2,414,680 2,414,680  Held to maturity securities — 2,482,540 — 2,482,540 2,428,432  Loans, net — 126,401 15,926,313 16,052,714 15,834,760  Loans held for sale — 42,545 — 42,545 42,545  Derivative financial instruments — 36,554 — 36,554 36,554  Financial liabilities:  Deposits $ — $ — $ 18,885,148 $ 18,885,148 $ 18,885,477  Federal funds purchased 1,250 — — 1,250 1,250  Securities sold under agreements to repurchase 335,894 — — 335,894 335,894  FHLB borrowings 738,812 — — 738,812 738,812  Long-term debt — 468,091 — 468,091 463,710  Derivative financial instruments — 37,899 — 37,899 37,899      December 31, 2015  Total Fair Carrying  (in thousands) Level 1 Level 2 Level 3 Value Amount  Financial assets:  Cash, interest-bearing bank deposits, and federal funds sold $ 869,429 $ — $ — $ 869,429 $ 869,429  Available for sale securities 2,757 2,090,647 — 2,093,404 2,093,404  Held to maturity securities — 2,375,851 — 2,375,851 2,370,388  Loans, net — 93,602 15,334,201 15,427,803 15,522,135  Loans held for sale — 20,434 — 20,434 20,434  Derivative financial instruments — 23,251 — 23,251 23,251  Financial liabilities:  Deposits $ — $ — $ 18,327,425 $ 18,327,425 $ 18,348,912  Federal funds purchased 10,100 — — 10,100 10,100  Securities sold under agreements to repurchase 513,544 — — 513,544 513,544  FHLB borrowings 900,000 — — 900,000 900,000  Long-term debt — 488,711 — 488,711 490,145  Derivative financial instruments — 23,968 — 23,968 23,968 

Securities (Narrative) (Details

Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Securities [Abstract]
Securities classified as trading	$ 0		$ 0		$ 0
Proceeds from sales of securities			141,716	$ 9,287
Realized gain	351	$ 4	1,465	$ 337
Securities pledged as collateral	$ 3,700,000		$ 3,700,000		$ 3,500,000

Securities (Amortized Cost and

Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	$ 2,370,621	$ 2,086,745
Securities Available for Sale, Gross Unrealized Gains	44,662	20,120
Securities Available for Sale, Gross Unrealized Losses	603	13,461
Securities Available for Sale, Fair Value	2,414,680	2,093,404
US Treasury and Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	20,604	135
Securities Available for Sale, Gross Unrealized Gains	67
Securities Available for Sale, Gross Unrealized Losses		1
Securities Available for Sale, Fair Value	20,671	134
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	214,403	39,410
Securities Available for Sale, Gross Unrealized Gains	3,024	235
Securities Available for Sale, Gross Unrealized Losses	409	38
Securities Available for Sale, Fair Value	217,018	39,607
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	1,737,812	1,750,168
Securities Available for Sale, Gross Unrealized Gains	38,204	19,387
Securities Available for Sale, Gross Unrealized Losses	91	11,182
Securities Available for Sale, Fair Value	1,775,925	1,758,373
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	172,525
Securities Available for Sale, Gross Unrealized Gains	687
Securities Available for Sale, Gross Unrealized Losses	103
Securities Available for Sale, Fair Value	173,109
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	220,912	291,085
Securities Available for Sale, Gross Unrealized Gains	2,344	140
Securities Available for Sale, Gross Unrealized Losses		2,192
Securities Available for Sale, Fair Value	223,256	289,033
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	3,500	3,500
Securities Available for Sale, Fair Value	3,500	3,500
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	865	2,447
Securities Available for Sale, Gross Unrealized Gains	336	358
Securities Available for Sale, Gross Unrealized Losses		48
Securities Available for Sale, Fair Value	$ 1,201	$ 2,757

Securities (Amortized Cost an37

Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Total held to maturity securities, Amortized Cost	$ 2,428,432	$ 2,370,388
Securities Held to Maturity, Gross Unrealized Gains	57,009	21,304
Securities Held to Maturity, Gross Unrealized Losses	2,901	15,841
Securities Held to Maturity, Fair Value	2,482,540	2,375,851
US Treasury and Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total held to maturity securities, Amortized Cost	50,000	50,000
Securities Held to Maturity, Gross Unrealized Gains	860
Securities Held to Maturity, Gross Unrealized Losses		410
Securities Held to Maturity, Fair Value	50,860	49,590
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total held to maturity securities, Amortized Cost	541,839	185,890
Securities Held to Maturity, Gross Unrealized Gains	11,182	3,475
Securities Held to Maturity, Gross Unrealized Losses	1,462	1,166
Securities Held to Maturity, Fair Value	551,559	188,199
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total held to maturity securities, Amortized Cost	903,703	1,014,135
Securities Held to Maturity, Gross Unrealized Gains	36,200	15,585
Securities Held to Maturity, Gross Unrealized Losses		1,589
Securities Held to Maturity, Fair Value	939,903	1,028,131
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total held to maturity securities, Amortized Cost	932,890	1,120,363
Securities Held to Maturity, Gross Unrealized Gains	8,767	2,244
Securities Held to Maturity, Gross Unrealized Losses	1,439	12,676
Securities Held to Maturity, Fair Value	$ 940,218	$ 1,109,931

Securities (Amortized Cost an38

Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Securities [Abstract]
Debt Securities Available for Sale, Due in one year or less, Amortized Cost	$ 4,864
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost	47,593
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost	609,897
Debt Securities Available for Sale, Due after ten years, Amortized Cost	1,707,402
Total available for sale debt securities, Amortized Cost	2,369,756
Debt Securities Available for Sale, Due in one year or less, Fair Value	4,900
Debt Securities Available for Sale, Due after one year through five years, Fair Value	48,597
Debt Securities Available for Sale, Due after five years through ten years, Fair Value	621,549
Debt Securities Available for Sale, Due after ten years, Fair Value	1,738,433
Total available for sale debt securities, Fair Value	2,413,479
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost	14,982
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost	135,330
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost	510,536
Debt Securities Held to Maturity, Due after ten years, Amortized Cost	1,767,584
Total held to maturity securities, Amortized Cost	2,428,432	$ 2,370,388
Debt Securities Held to Maturity, Due in one year or less, Fair Value	15,019
Debt Securities Held to Maturity, Due after one year through five years, Fair Value	138,737
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value	517,652
Debt Securities Held to Maturity, Due after ten years, Fair Value	1,811,132
Total held to maturity securities, Fair Value	$ 2,482,540	$ 2,375,851

Securities (Securities Availabl

Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	$ 115,004	$ 1,047,869
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	567	9,553
Available for Sale, Losses 12 months or longer, Fair Value	4,534	150,819
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	36	3,908
Available for Sale, Total, Fair Value	119,538	1,198,688
Available for Sale, Total, Gross Unrealized Losses	603	13,461
US Treasury and Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses 12 months or longer, Fair Value		82
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses		1
Available for Sale, Total, Fair Value		82
Available for Sale, Total, Gross Unrealized Losses		1
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	69,801	8,296
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	409	38
Available for Sale, Total, Fair Value	69,801	8,296
Available for Sale, Total, Gross Unrealized Losses	409	38
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	6,653	831,156
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	55	8,257
Available for Sale, Losses 12 months or longer, Fair Value	4,534	116,126
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	36	2,925
Available for Sale, Total, Fair Value	11,187	947,282
Available for Sale, Total, Gross Unrealized Losses	91	11,182
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	31,640
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	103
Available for Sale, Total, Fair Value	31,640
Available for Sale, Total, Gross Unrealized Losses	103
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	6,910	208,397
Available for Sale, Losses less than 12 months, Gross Unrealized Losses		1,257
Available for Sale, Losses 12 months or longer, Fair Value		33,138
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses		935
Available for Sale, Total, Fair Value	$ 6,910	241,535
Available for Sale, Total, Gross Unrealized Losses		2,192
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value		20
Available for Sale, Losses less than 12 months, Gross Unrealized Losses		1
Available for Sale, Losses 12 months or longer, Fair Value		1,473
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses		47
Available for Sale, Total, Fair Value		1,493
Available for Sale, Total, Gross Unrealized Losses		$ 48

Securities (Securities Held to

Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	$ 217,467	$ 934,207
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	1,181	5,194
Held to maturity, Losses 12 months or longer, Fair Value	144,803	419,483
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	1,720	10,647
Held to maturity, Total, Fair Value	362,270	1,353,690
Held to maturity, Total, Gross Unrealized Losses	2,901	15,841
US Treasury and Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value		45,590
Held to maturity, Losses less than 12 months, Gross Unrealized Losses		410
Held to maturity, Total, Fair Value		45,590
Held to maturity, Total, Gross Unrealized Losses		410
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	98,295	22,652
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	1,035	301
Held to maturity, Losses 12 months or longer, Fair Value	11,843	48,727
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	427	865
Held to maturity, Total, Fair Value	110,138	71,379
Held to maturity, Total, Gross Unrealized Losses	1,462	1,166
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value		349,635
Held to maturity, Losses less than 12 months, Gross Unrealized Losses		1,589
Held to maturity, Total, Fair Value		349,635
Held to maturity, Total, Gross Unrealized Losses		1,589
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	119,172	516,330
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	146	2,894
Held to maturity, Losses 12 months or longer, Fair Value	132,960	370,756
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	1,293	9,782
Held to maturity, Total, Fair Value	252,132	887,086
Held to maturity, Total, Gross Unrealized Losses	$ 1,439	$ 12,676

Loans and Allowance for Loan 41

Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)contractagreement	Sep. 30, 2015USD ($)contract	Dec. 31, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 302,810		$ 159,713
TDRs both accruing and nonaccruing	56,300		13,100
Post-Modification outstanding recorded investment	$ 58,447	$ 687
Number of TDRs subsequently defaulted | contract	0	0
TDRs and loans impaired with minimum aggregate relationship balances	$ 1,000
Real estate acquired through foreclosure	$ 19,097		26,256
Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period for which payments of principal and interest are past due	less than 90 days
Troubled Debt Restructurings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 48,200		8,800
Troubled Debt Restructurings [Member] | Loans With Extended Amortization Terms Or Other Payment Concessions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post-Modification outstanding recorded investment	43,400	$ 700
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post-Modification outstanding recorded investment	14,700
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post-Modification outstanding recorded investment	$ 400	100
FDIC Loss Share Agreement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loss share agreements | agreement	2
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 11,752		9,061
Post-Modification outstanding recorded investment		20
Real estate in process of foreclosure	9,200		7,400
Real estate acquired through foreclosure	4,500		9,300
Consumer [Member] | FDIC Loss Share Agreement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate in process of foreclosure	2,800		4,100
Real estate acquired through foreclosure	$ 900		$ 1,600
Non-Single Family Portfolio [Member] | FDIC Loss Share Agreement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recovery period	3 years
Percentage of recoveries on reimbursed losses due to FDIC	80.00%
Single Family Portfolio [Member] | FDIC Loss Share Agreement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans covered by loss share agreement	$ 152,300	$ 177,500

Loans and Allowance for Loan 42

Loans and Allowance for Loan Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 16,070,821	$ 15,703,314	$ 14,763,050
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	11,972,654	11,560,325
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,037,162	2,049,524	2,013,789
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,061,005	2,093,465	1,990,296
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,990,309	1,553,082	1,484,232
Construction and Land Development [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	946,592	1,151,950	1,085,585
Total Commercial & Industrial [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,035,753	8,855,293	8,189,148
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	7,133,928	6,995,824	6,345,994
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,901,825	$ 1,859,469	$ 1,843,154

Loans and Allowance for Loan 43

Loans and Allowance for Loan Losses (Allowance for Loan Losses by Portfolio Class) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			$ 181,179	$ 128,762
Allowance for loan losses: Net provision for loan losses	$ 18,972	$ 10,080	96,204	22,842
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			(3,027)	(1,984)
Allowance for loan losses: Ending balance	236,061	139,576	236,061	139,576
Allowance for loan losses: Individually evaluated for impairment	21,130	8,618	21,130	8,618
Allowance for loan losses: Amounts related to purchased credit impaired loans	19,708	25,505	19,708	25,505
Allowance for loan losses: Collectively evaluated for impairment	195,223	105,453	195,223	105,453
Loans: Individually evaluated for impairment	256,563	112,443	256,563	112,443
Loans: Purchased credit impaired loans	201,792	249,905	201,792	249,905	$ 225,838	$ 313,685
Loans: Collectively evaluated for impairment	15,612,466	14,400,702	15,612,466	14,400,702
Loans: Total loans	16,070,821	14,763,050	16,070,821	14,763,050	15,703,314
Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Total loans	11,972,654		11,972,654		11,560,325
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			6,041	7,546
Allowance for loan losses: Ending balance	10,950	5,133	10,950	5,133
Allowance for loan losses: Individually evaluated for impairment	57	187	57	187
Allowance for loan losses: Amounts related to purchased credit impaired loans	279	885	279	885
Allowance for loan losses: Collectively evaluated for impairment	10,614	4,061	10,614	4,061
Loans: Individually evaluated for impairment	7,655	12,520	7,655	12,520
Loans: Purchased credit impaired loans	8,087	15,280	8,087	15,280
Loans: Collectively evaluated for impairment	1,974,567	1,456,432	1,974,567	1,456,432
Loans: Total loans	1,990,309	1,484,232	1,990,309	1,484,232	1,553,082
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			5,642	6,421
Allowance for loan losses: Ending balance	5,848	7,374	5,848	7,374
Allowance for loan losses: Individually evaluated for impairment	6	21	6	21
Allowance for loan losses: Amounts related to purchased credit impaired loans	484	1,727	484	1,727
Allowance for loan losses: Collectively evaluated for impairment	5,358	5,626	5,358	5,626
Loans: Individually evaluated for impairment	2,062	2,053	2,062	2,053
Loans: Purchased credit impaired loans	8,436	16,336	8,436	16,336
Loans: Collectively evaluated for impairment	936,094	1,067,196	936,094	1,067,196
Loans: Total loans	946,592	1,085,585	946,592	1,085,585	1,151,950
Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			25,353	28,660
Allowance for loan losses: Ending balance	24,192	25,790	24,192	25,790
Allowance for loan losses: Individually evaluated for impairment	94	96	94	96
Allowance for loan losses: Amounts related to purchased credit impaired loans	15,949	18,329	15,949	18,329
Allowance for loan losses: Collectively evaluated for impairment	8,149	7,365	8,149	7,365
Loans: Individually evaluated for impairment	3,864	903	3,864	903
Loans: Purchased credit impaired loans	145,273	170,033	145,273	170,033
Loans: Collectively evaluated for impairment	1,888,025	1,842,853	1,888,025	1,842,853
Loans: Total loans	2,037,162	2,013,789	2,037,162	2,013,789	2,049,524
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			24,857	21,430
Allowance for loan losses: Ending balance	25,027	23,252	25,027	23,252
Allowance for loan losses: Individually evaluated for impairment	85	3	85	3
Allowance for loan losses: Amounts related to purchased credit impaired loans	1,334	2,711	1,334	2,711
Allowance for loan losses: Collectively evaluated for impairment	23,608	20,538	23,608	20,538
Loans: Individually evaluated for impairment	1,485	157	1,485	157
Loans: Purchased credit impaired loans	12,045	13,424	12,045	13,424
Loans: Collectively evaluated for impairment	2,047,475	1,976,715	2,047,475	1,976,715
Loans: Total loans	2,061,005	1,990,296	2,061,005	1,990,296	2,093,465
Purchased Credit Impaired [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(146)	(5,451)
Allowance for loan losses: Recoveries			484	3,742
Allowance for loan losses: Net provision for loan losses			(723)	(1,386)
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			(3,027)	(1,984)
Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(1)	(2,353)
Allowance for loan losses: Recoveries			2	20
Allowance for loan losses: Net provision for loan losses			(436)	994
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable				919
Purchased Credit Impaired [Member] | Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(18)	(406)
Allowance for loan losses: Recoveries			98	896
Allowance for loan losses: Net provision for loan losses			(253)	235
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable				(6)
Purchased Credit Impaired [Member] | Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(91)	(748)
Allowance for loan losses: Recoveries			33	5
Allowance for loan losses: Net provision for loan losses			1,685	1,181
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			(3,341)	(2,718)
Purchased Credit Impaired [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(8)	(140)
Allowance for loan losses: Recoveries			112	185
Allowance for loan losses: Net provision for loan losses			(1,633)	(1,232)
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			316	(97)
Non-Purchased Credit Impaired [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(48,493)	(17,561)
Allowance for loan losses: Recoveries			9,860	9,226
Allowance for loan losses: Net provision for loan losses			96,927	24,228
Non-Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(191)	(464)
Allowance for loan losses: Recoveries			673	386
Allowance for loan losses: Net provision for loan losses			4,862	(1,915)
Non-Purchased Credit Impaired [Member] | Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(827)	(1,483)
Allowance for loan losses: Recoveries			1,422	2,006
Allowance for loan losses: Net provision for loan losses			(216)	(289)
Non-Purchased Credit Impaired [Member] | Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(908)	(1,451)
Allowance for loan losses: Recoveries			497	578
Allowance for loan losses: Net provision for loan losses			964	283
Non-Purchased Credit Impaired [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(17,403)	(10,431)
Allowance for loan losses: Recoveries			4,272	3,418
Allowance for loan losses: Net provision for loan losses			14,514	10,119
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			119,286	64,705
Allowance for loan losses: Ending balance	170,044	78,027	170,044	78,027
Allowance for loan losses: Individually evaluated for impairment	20,888	8,311	20,888	8,311
Allowance for loan losses: Amounts related to purchased credit impaired loans	1,662	1,853	1,662	1,853
Allowance for loan losses: Collectively evaluated for impairment	147,494	67,863	147,494	67,863
Loans: Individually evaluated for impairment	241,497	96,810	241,497	96,810
Loans: Purchased credit impaired loans	27,951	34,832	27,951	34,832
Loans: Collectively evaluated for impairment	8,766,305	8,057,506	8,766,305	8,057,506
Loans: Total loans	9,035,753	8,189,148	9,035,753	8,189,148	8,855,293
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			109,428	51,169
Allowance for loan losses: Ending balance	159,261	63,922	159,261	63,922
Allowance for loan losses: Individually evaluated for impairment	20,665	5,588	20,665	5,588
Allowance for loan losses: Amounts related to purchased credit impaired loans	574	549	574	549
Allowance for loan losses: Collectively evaluated for impairment	138,022	57,785	138,022	57,785
Loans: Individually evaluated for impairment	235,039	75,345	235,039	75,345
Loans: Purchased credit impaired loans	11,534	13,158	11,534	13,158
Loans: Collectively evaluated for impairment	6,887,355	6,257,491	6,887,355	6,257,491
Loans: Total loans	7,133,928	6,345,994	7,133,928	6,345,994	6,995,824
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			9,858	13,536
Allowance for loan losses: Ending balance	10,783	14,105	10,783	14,105
Allowance for loan losses: Individually evaluated for impairment	223	2,723	223	2,723
Allowance for loan losses: Amounts related to purchased credit impaired loans	1,088	1,304	1,088	1,304
Allowance for loan losses: Collectively evaluated for impairment	9,472	10,078	9,472	10,078
Loans: Individually evaluated for impairment	6,458	21,465	6,458	21,465
Loans: Purchased credit impaired loans	16,417	21,674	16,417	21,674
Loans: Collectively evaluated for impairment	1,878,950	1,800,015	1,878,950	1,800,015
Loans: Total loans	$ 1,901,825	$ 1,843,154	1,901,825	1,843,154	$ 1,859,469
Total Commercial & Industrial [Member] | Purchased Credit Impaired [Member] | Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(28)	(1,804)
Allowance for loan losses: Recoveries			239	2,636
Allowance for loan losses: Net provision for loan losses			(86)	(2,564)
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			(2)	(82)
Total Commercial & Industrial [Member] | Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs				(1,425)
Allowance for loan losses: Recoveries			76	1,699
Allowance for loan losses: Net provision for loan losses			54	(950)
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			(2)	314
Total Commercial & Industrial [Member] | Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(28)	(379)
Allowance for loan losses: Recoveries			163	937
Allowance for loan losses: Net provision for loan losses			(140)	(1,614)
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable				(396)
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired [Member] | Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(29,164)	(3,732)
Allowance for loan losses: Recoveries			2,996	2,838
Allowance for loan losses: Net provision for loan losses			76,803	16,030
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(27,504)	(3,068)
Allowance for loan losses: Recoveries			2,709	2,589
Allowance for loan losses: Net provision for loan losses			74,500	13,594
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(1,660)	(664)
Allowance for loan losses: Recoveries			287	249
Allowance for loan losses: Net provision for loan losses			$ 2,303	$ 2,436

Loans and Allowance for Loan 44

Loans and Allowance for Loan Losses (Composition of Nonaccrual Loans by Portfolio Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 302,810	$ 159,713
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	9,318	10,815
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	4,930	17,294
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	21,181	23,799
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	11,752	9,061
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	255,629	98,744
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	240,298	88,743
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 15,331	$ 10,001

Loans and Allowance for Loan 45

Loans and Allowance for Loan Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)contract	Sep. 30, 2015USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	23	6
Pre-Modification Outstanding Recorded Investment	$ 58,447	$ 687
Post-Modification Outstanding Recorded Investment	$ 58,447	$ 687
Total Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	17
Pre-Modification Outstanding Recorded Investment	$ 57,915
Post-Modification Outstanding Recorded Investment	$ 57,915
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract		1
Pre-Modification Outstanding Recorded Investment		$ 482
Post-Modification Outstanding Recorded Investment		$ 482
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	6	4
Pre-Modification Outstanding Recorded Investment	$ 532	$ 185
Post-Modification Outstanding Recorded Investment	$ 532	$ 185
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract		1
Pre-Modification Outstanding Recorded Investment		$ 20
Post-Modification Outstanding Recorded Investment		$ 20
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	17
Pre-Modification Outstanding Recorded Investment	$ 57,915
Post-Modification Outstanding Recorded Investment	$ 57,915
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment

Loans and Allowance for Loan 46

Loans and Allowance for Loan Losses (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	$ 132,668		$ 132,668		$ 55,034
Recorded investment with an allowance	123,895		123,895		58,392
Unpaid principal balance	271,236		271,236		118,623
Related allowance	21,130		21,130		20,988
Average recorded investment	252,963	$ 92,527	221,634	$ 64,011
Interest income recognized	194	42	1,119	191
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	5,654		5,654		3,038
Recorded investment with an allowance	2,001		2,001		8,085
Unpaid principal balance	7,882		7,882		11,363
Related allowance	57		57		1,382
Average recorded investment	7,729	12,601	8,624	10,905
Interest income recognized	24	15	67	56
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	1,228		1,228		12,461
Recorded investment with an allowance	834		834		1,765
Unpaid principal balance	2,905		2,905		14,784
Related allowance	6		6		392
Average recorded investment	1,655	3,207	7,821	4,762
Interest income recognized		7		66
Residential Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	2,908		2,908
Recorded investment with an allowance	956		956		895
Unpaid principal balance	4,382		4,382		1,405
Related allowance	94		94		127
Average recorded investment	2,466	1,136	1,444	1,837
Interest income recognized	3	1	7	20
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment with an allowance	1,485		1,485		152
Unpaid principal balance	1,485		1,485		152
Related allowance	85		85		33
Average recorded investment	826	137	348	101
Interest income recognized	2		4	3
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	122,878		122,878		39,535
Recorded investment with an allowance	118,619		118,619		47,495
Unpaid principal balance	254,582		254,582		90,919
Related allowance	20,888		20,888		19,054
Average recorded investment	240,287	75,446	203,397	46,406
Interest income recognized	165	19	1,041	46
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	118,527		118,527		34,788
Recorded investment with an allowance	116,512		116,512		46,834
Unpaid principal balance	247,732		247,732		84,988
Related allowance	20,665		20,665		19,031
Average recorded investment	233,913	53,862	197,382	31,570
Interest income recognized	155	3	1,002	6
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	4,351		4,351		4,747
Recorded investment with an allowance	2,107		2,107		661
Unpaid principal balance	6,850		6,850		5,931
Related allowance	223		223		$ 23
Average recorded investment	6,374	21,584	6,015	14,836
Interest income recognized	$ 10	$ 16	$ 39	$ 40

Loans and Allowance for Loan 47

Loans and Allowance for Loan Losses (Age Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 201,790	$ 153,691
Current	15,869,031	15,549,623
Total loans	16,070,821	15,703,314	$ 14,763,050
Recorded investment > 90 days and still accruing	4,933	7,653
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	60,166	79,027
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	39,644	12,101
Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	101,980	62,563
Total Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	11,972,654	11,560,325
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6,519	7,856
Current	1,983,790	1,545,226
Total loans	1,990,309	1,553,082	1,484,232
Recorded investment > 90 days and still accruing		499
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,873	871
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	225	603
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,421	6,382
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	9,992	24,365
Current	936,600	1,127,585
Total loans	946,592	1,151,950	1,085,585
Recorded investment > 90 days and still accruing	3,501	1,230
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,069	19,886
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,565	436
Total Commercial [Member] | Construction and Land Development [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7,358	4,043
Total Commercial [Member] | Total Commercial & Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	115,239	57,227
Current	8,920,514	8,798,066
Total loans	9,035,753	8,855,293	8,189,148
Recorded investment > 90 days and still accruing	543	3,595
Total Commercial [Member] | Total Commercial & Industrial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	18,507	23,304
Total Commercial [Member] | Total Commercial & Industrial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	25,681	2,270
Total Commercial [Member] | Total Commercial & Industrial [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	71,051	31,653
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	103,861	43,881
Current	7,030,067	6,951,943
Total loans	7,133,928	6,995,824	6,345,994
Recorded investment > 90 days and still accruing	543	3,060
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	15,501	17,406
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	24,566	1,468
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	63,794	25,007
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	11,378	13,346
Current	1,890,447	1,846,123
Total loans	1,901,825	1,859,469	1,843,154
Recorded investment > 90 days and still accruing		535
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,006	5,898
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,115	802
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7,257	6,646
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	41,379	34,857
Current	1,995,783	2,014,667
Total loans	2,037,162	2,049,524	2,013,789
Recorded investment > 90 days and still accruing		163
Residential Mortgages [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	23,067	18,657
Residential Mortgages [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6,771	4,360
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	11,541	11,840
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	28,661	29,386
Current	2,032,344	2,064,079
Total loans	2,061,005	2,093,465	$ 1,990,296
Recorded investment > 90 days and still accruing	889	2,166
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	15,650	16,309
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	5,402	4,432
Consumer [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 7,609	$ 8,645

Loans and Allowance for Loan 48

Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 16,070,821	$ 15,703,314	$ 14,763,050
Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,972,654	11,560,325
Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,401,630	10,577,368
Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	314,912	221,911
Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	234,752	270,579
Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	991,396	490,407
Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	29,964	60
Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,037,162	2,049,524	2,013,789
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,061,005	2,093,465	1,990,296
Residential Mortgages and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,098,167	4,142,989
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,990,309	1,553,082	1,484,232
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,876,423	1,502,484
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	69,773	14,717
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,100	5,905
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	38,000	29,960
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13	16
Construction and Land Development [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	946,592	1,151,950	1,085,585
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	904,550	1,095,296
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	21,945	6,841
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	198	12,297
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	19,899	37,516
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,035,753	8,855,293	8,189,148
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,620,657	7,979,588
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	223,194	200,353
Total Commercial & Industrial [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	228,454	252,377
Total Commercial & Industrial [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	933,497	422,931
Total Commercial & Industrial [Member] | Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	29,951	44
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,133,928	6,995,824	6,345,994
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,899,626	6,260,863
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	180,467	168,589
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	196,408	211,230
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	827,476	355,098
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	29,951	44
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,901,825	1,859,469	$ 1,843,154
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,721,031	1,718,725
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	42,727	31,764
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	32,046	41,147
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	106,021	67,833
Performing [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,015,981	2,025,563
Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,048,364	2,082,238
Performing [Member] | Residential Mortgages and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,064,345	4,107,801
Nonperforming [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	21,181	23,961
Nonperforming [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,641	11,227
Nonperforming [Member] | Residential Mortgages and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 33,822	$ 35,188

Loans and Allowance for Loan 49

Loans and Allowance for Loan Losses (Activity in Loss Share Receivable) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Loans and Allowance for Loan Losses [Abstract]
Beginning balance			$ 29,868	$ 60,272
Amortization	$ (1,539)	$ (1,564)	(4,678)	(4,034)
Charge-offs, write-downs and other recoveries			(5,569)	(6,733)
External expenses qualifying under loss share agreement			1,000	1,035
Changes due to changes in cash flow projections			(3,027)	(1,984)
FDIC resolution of denied claims				(1,854)
Net payments to (from) FDIC			436	(14,667)
Ending balance	$ 18,030	$ 32,035	$ 18,030	$ 32,035

Loans and Allowance for Loan 50

Loans and Allowance for Loan Losses (Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Loans and Allowance for Loan Losses [Abstract]
Carrying Amount of Loans, Balance at beginning of period	$ 225,838	$ 313,685
Carrying Amount of Loans, Payments received, net	(39,446)	(115,847)
Carrying Amount of Loans, Accretion	15,400	28,000
Carrying Amount of Loans, Balance at end of period	201,792	225,838
Accretable Yield, Balance at beginning of period	129,488	187,456
Accretable Yield, Payments received, net	(7,575)	(21,978)
Accretable Yield, Accretion	(15,400)	(28,000)
Accretable Yield, Increase (decrease) in expected cash flows based on actual cash flows and changes in cash flow assumptions	5,352	(4,238)
Accretable Yield, Net transfers to (from) nonaccretable difference to accretable yield	10,675	(3,752)
Accretable Yield, Balance at end of period	$ 122,540	$ 129,488

Securities Sold under Agreeme51

Securities Sold under Agreements to Repurchase (Details) $ in Millions	Sep. 30, 2016USD ($)
Securities Sold under Agreements to Repurchase [Abstract]
Securities sold under agreements to repurchase	$ 335.9

Long-Term Debt (Long-Term Debt)

Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Gross long-term debt	$ 469,352
Less unamortized debt issuance costs	(5,642)	$ (5,854)
Total long-term debt less unamortized debt issuance costs	463,710	490,145
Subordinated Notes [Member] | Subordinated Notes Payable Maturing June 2045 [Member]
Debt Instrument [Line Items]
Gross long-term debt	150,000	150,000
Less unamortized debt issuance costs	$ (5,000)
Notes payable maturity date	Jun. 15, 2045
Subordinated Notes [Member] | Subordinated Notes Payable Maturing April 2017 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 95,511	98,011
Notes payable maturity date	Apr. 1, 2017
Term Note [Member] | Term Note Payable Maturing December 2018 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 111,575	125,000
Less unamortized debt issuance costs	$ (642)
Notes payable maturity date	Dec. 18, 2018
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 112,266	$ 122,988

Long-Term Debt (Long-Term Debt

Long-Term Debt (Long-Term Debt with Related Unamortized Debt Issuance Cost) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal	$ 469,352
Unamortized Debt Issuance Costs	5,642	$ 5,854
Subordinated Notes [Member] | Subordinated Notes Payable Maturing June 2045 [Member]
Debt Instrument [Line Items]
Principal	150,000	150,000
Unamortized Debt Issuance Costs	$ 5,000
Notes payable maturity date	Jun. 15, 2045
Subordinated Notes [Member] | Subordinated Notes Payable Maturing April 2017 [Member]
Debt Instrument [Line Items]
Principal	$ 95,511	98,011
Notes payable maturity date	Apr. 1, 2017
Term Note [Member] | Term Note Payable Maturing December 2018 [Member]
Debt Instrument [Line Items]
Principal	$ 111,575	125,000
Unamortized Debt Issuance Costs	$ 642
Notes payable maturity date	Dec. 18, 2018
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Principal	$ 112,266	$ 122,988

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)agreement	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Derivative [Line Items]
Ineffective portion of change in derivative fair value	$ 0
Derivative income reflected in income statement	1,700	$ 1,500
Impact to interest income from cash flow hedges	1,700	$ 1,500
Aggregate fair value of derivatives in a net liability position	36,300
Collateral obligations for derivative counterparties	37,500
Derivatives Designated as Hedging Instruments [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 1,100,000		$ 500,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member]
Derivative [Line Items]
Number of interest rate swap agreements | agreement	8
Notional amount of derivatives	$ 1,100,000		$ 500,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | $300 Million Swap Agreement Expires January 2017 [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 300,000
Swap agreement expiration date	Jan. 1, 2017
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | $200 Million Swap Agreement Expires June 2017 [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 200,000
Swap agreement expiration date	Jun. 1, 2017
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | $100 Million Swap Agreement Expires April 2018, 2019, 2020 [Member]
Derivative [Line Items]
Number of interest rate swap agreements | agreement	3
Notional amount of derivatives	$ 100,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | $100 Million Swap Agreement Expires September 2018, 2019, 2020 [Member]
Derivative [Line Items]
Number of interest rate swap agreements | agreement	3
Notional amount of derivatives	$ 100,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date One [Member] | $100 Million Swap Agreement Expires April 2018, 2019, 2020 [Member]
Derivative [Line Items]
Swap agreement expiration date	Apr. 1, 2018
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date One [Member] | $100 Million Swap Agreement Expires September 2018, 2019, 2020 [Member]
Derivative [Line Items]
Swap agreement expiration date	Sep. 1, 2018
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Two [Member] | $100 Million Swap Agreement Expires April 2018, 2019, 2020 [Member]
Derivative [Line Items]
Swap agreement expiration date	Apr. 1, 2019
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Two [Member] | $100 Million Swap Agreement Expires September 2018, 2019, 2020 [Member]
Derivative [Line Items]
Swap agreement expiration date	Sep. 1, 2019
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Three [Member] | $100 Million Swap Agreement Expires April 2018, 2019, 2020 [Member]
Derivative [Line Items]
Swap agreement expiration date	Apr. 1, 2020
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Three [Member] | $100 Million Swap Agreement Expires September 2018, 2019, 2020 [Member]
Derivative [Line Items]
Swap agreement expiration date	Sep. 1, 2020

Derivatives (Fair Values of Der

Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Fair Values, Assets		$ 1,352	$ 224
Fair Values, Liabilities		36,267	21,034
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		1,100,000	500,000
Fair Values, Assets	[1]	1,135
Fair Values, Liabilities	[1]	254	281
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		1,185,453	1,002,350
Fair Values, Assets	[1]	35,419	23,251
Fair Values, Liabilities	[1]	37,645	23,687
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts	[2]	905,662	780,871
Fair Values, Assets	[1],[2]	33,732	20,622
Fair Values, Liabilities	[1],[2]	35,447	21,007
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		86,839	83,430
Fair Values, Assets	[1]	97	83
Fair Values, Liabilities	[1]	215	162
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		102,495	55,128
Fair Values, Assets	[1]	88	263
Fair Values, Liabilities	[1]	997	336
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		60,757	38,853
Fair Values, Assets	[1]	532	243
Fair Values, Liabilities	[1]	33	167
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		29,700	44,068
Fair Values, Assets	[1]	970	2,040
Fair Values, Liabilities	[1]	953	2,015
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		1,100,000	500,000
Fair Values, Assets	[1]	1,135
Fair Values, Liabilities	[1]	$ 254	$ 281
[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.

Derivatives (Offsetting Derivat

Derivatives (Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivatives [Abstract]
Gross Amounts Recognized, Derivative Assets	$ 1,352	$ 224
Gross Amounts Offset in the Statement of Financial Position, Derivative Assets
Net Amounts Presented in the Statement of Financial Position, Derivative Assets	1,352	224
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments, Derivative Assets	1,352	224
Gross Amounts Not offset in the Statement of Financial Position -Cash Collateral, Derivative Assets
Net Amount, Derivative Asset
Gross Amounts Recognized, Derivative Liabilities	36,267	21,034
Gross Amounts Offset in the Statement of Financial Position, Derivative Liabilities
Net Amounts Presented in the Statement of Financial Position, Derivative Liabilities	36,267	21,034
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments, Derivative Liabilities	1,352	224
Gross Amounts Not offset in the Statement of Financial Position -Cash Collateral, Derivative Liabilities	37,451	23,482
Net Amount, Derivative Liabilities	$ (2,536)	$ (2,672)

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - $ / shares	Aug. 28, 2015	Sep. 30, 2016	Sep. 30, 2016
Equity, Class of Treasury Stock [Line Items]
Shares authorized for repurchase	5.00%
Number of shares authorized for repurchase	3,900,000
Expiration date		Sep. 30, 2016
Treasury Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchased common stock shares		0	741,393
Shares repurchased price per share			$ 27.44

Stockholders' Equity (Component

Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (80,595)	$ (50,074)
Net change in unrealized gain	$ (5,604)	$ 15,131	39,997	2,174
Reclassification of net (gain) losses realized and included in earnings	1,158	802	2,960	2,208
Valuation adjustment for employee benefit plans	(6,347)	4,963	(6,347)	(959)
Amortization of unrealized net loss on securities transferred to HTM	1,108	1,023	2,736	2,609
Income tax (benefit) expense	(3,537)	8,002	14,440	2,125
Ending Balance	(55,689)	(46,167)	(55,689)	(46,167)
Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			4,268	18,001
Net change in unrealized gain			38,835	163
Reclassification of net (gain) losses realized and included in earnings			(1,435)	(165)
Valuation adjustment for employee benefit plans
Amortization of unrealized net loss on securities transferred to HTM
Income tax (benefit) expense			13,701	(73)
Ending Balance	27,967	18,072	27,967	18,072
HTM Securities Transferred from AFS [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(16,795)	(19,074)
Net change in unrealized gain
Reclassification of net (gain) losses realized and included in earnings
Valuation adjustment for employee benefit plans
Amortization of unrealized net loss on securities transferred to HTM			2,736	2,609
Income tax (benefit) expense			1,029	953
Ending Balance	(15,088)	(17,418)	(15,088)	(17,418)
Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(67,890)	(48,626)
Net change in unrealized gain
Reclassification of net (gain) losses realized and included in earnings			4,395	2,373
Valuation adjustment for employee benefit plans			(6,347)	(959)
Amortization of unrealized net loss on securities transferred to HTM
Income tax (benefit) expense			(714)	513
Ending Balance	(69,128)	(47,725)	(69,128)	(47,725)
Loss on Effective Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(178)	(375)
Net change in unrealized gain			1,162	2,011
Reclassification of net (gain) losses realized and included in earnings
Valuation adjustment for employee benefit plans
Amortization of unrealized net loss on securities transferred to HTM
Income tax (benefit) expense			424	732
Ending Balance	$ 560	$ 904	$ 560	$ 904

Stockholders' Equity (Line Item

Stockholders' Equity (Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of AFS securities		$ (1,158)	$ (802)	$ (2,960)	$ (2,208)
Available for Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of AFS securities				1,435	165
HTM Securities Transferred from AFS [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of AFS securities
Employee Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of AFS securities				(4,395)	(2,373)
Amount Reclassified from Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	[1]			(3,631)	(3,091)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Available for Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of AFS securities	[1]			1,435	165
Tax effect	[1]			502	58
Net of tax	[1]			933	107
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | HTM Securities Transferred from AFS [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized net loss on securities transferred to HTM	[1]			(2,736)	(2,609)
Tax effect	[1]			1,029	953
Net of tax	[1]			(1,707)	(1,656)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Employee Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items	[1],[2]			(4,395)	(2,373)
Tax effect	[1]			1,538	831
Net of tax	[1]			$ (2,857)	$ (1,542)
[1]	Amounts in parenthesis indicate reduction in net income.
[2]	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 Note 11 for additional details).

Other Noninterest Income (Detai

Other Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Noninterest Income [Abstract]
Income from bank-owned life insurance	$ 4,097	$ 2,451	$ 11,148	$ 7,788
Credit related fees	2,685	2,718	7,309	7,786
Derivative income	1,347	74	1,741	1,486
Net gain on sale of assets	991	418	4,557	363
Safety deposit box income	424	441	1,315	1,356
Other miscellaneous	2,322	2,268	6,698	7,360
Total other noninterest income	$ 11,866	$ 8,370	$ 32,768	$ 26,139

Other Noninterest Expense (Deta

Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Noninterest Expense [Abstract]
Advertising	$ 2,859	$ 2,856	$ 7,909	$ 7,154
Ad valorem and franchise taxes	2,268	2,868	6,911	8,319
Printing and supplies	1,134	1,193	3,310	3,568
Insurance expense	803	794	2,467	2,644
Travel expense	1,022	1,419	3,050	3,946
Entertainment and contributions	1,686	1,634	5,319	5,009
Tax credit investment amortization	861	2,161	4,437	6,352
Other miscellaneous	11,746	3,634	22,158	16,679
Total other noninterest expense	$ 22,379	$ 16,559	$ 55,561	$ 53,671

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income to common shareholders	$ 46,719	$ 41,166	$ 97,465	$ 116,154
Net income allocated to participating securities - basic and diluted	1,101	840	2,334	2,541
Net income allocated to common shareholders - basic and diluted	$ 45,618	$ 40,326	$ 95,131	$ 113,613
Weighted-average common shares - basic	77,550,000	77,928,000	77,525,000	78,452,000
Dilutive potential common shares	127,000	147,000	128,000	157,000
Weighted-average common shares - diluted	77,677,000	78,075,000	77,653,000	78,609,000
Earnings per common share: Basic	$ 0.59	$ 0.52	$ 1.23	$ 1.45
Earnings per common share: Diluted	$ 0.59	$ 0.52	$ 1.23	$ 1.45
Weighted-average anti-dilutive potential common shares	317,893	761,113	578,863	815,765

Retirement Plans (Narrative) (D

Retirement Plans (Narrative) (Details)	9 Months Ended
	Sep. 30, 2016USD ($)
Defined Benefit Plan Disclosure [Line Items]
Estimated contribution in the current year	$ 0
First 1% Of Contribution Saved [Member] | Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage	100.00%
Percentage of compensation saved	1.00%
Next 5% Of Contribution Saved [Member] | Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage	50.00%
Percentage of compensation saved	5.00%

Retirement Plans (Components of

Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3,611	$ 3,383	$ 10,487	$ 10,128
Interest cost	4,022	4,672	13,033	13,963
Expected return on plan assets	(8,554)	(8,207)	(25,999)	(24,626)
Amortization of net loss	1,426	842	4,320	2,328
Net periodic benefit cost	505	690	1,841	1,793
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	45	23	119	95
Interest cost	204	174	613	717
Amortization of net loss	53	(40)	75	45
Net periodic benefit cost	$ 302	$ 157	$ 807	$ 857

Share-Based Payment Arrangeme65

Share-Based Payment Arrangements (Narrative) (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)entity$ / sharesshares	Sep. 30, 2015USD ($)
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised | $		$ 0.2
Restricted and Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense | $	$ 33.6
Weighted-average period	3 years 1 month 6 days
Total fair value of shares vested | $	$ 2.2	$ 7.6
Shares granted | shares	106,403
Grant date fair value per share | $ / shares	$ 25.15
Executive Management [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period	3 years
Executive Management [Member] | Performance Shares [Member] | Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	35,587
Grant date fair value per share | $ / shares	$ 24.42
Vesting performance period	3 years
Number of peer group regional banks | entity	44
Executive Management [Member] | Performance Shares [Member] | Core Earnings Per Share [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	35,587
Grant date fair value per share | $ / shares	$ 22.58
Vesting performance period	2 years
Executive Management [Member] | Tranche One [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of maximum number of shares vested	200.00%

Share-Based Payment Arrangeme66

Share-Based Payment Arrangements (Summary of Option Activity) (Details) - Options [Member] $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at Beginning | shares	745,806
Number of Shares, Exercised/Released | shares	(1,660)
Number of Shares, Cancelled/Forfeited | shares	(66,345)
Number of Shares, Expired | shares	(150,847)
Number of Shares, Outstanding at Ending | shares	526,954
Number of Shares, Exercisable at Ending | shares	483,199
Weighted Average Exercise Price, Outstanding at Beginning | $ / shares	$ 37.55
Weighted Average Exercise Price, Exercised/Released | $ / shares	29.73
Weighted Average Exercise Price, Cancelled/Forfeited | $ / shares	35.25
Weighted Average Exercise Price, Expired | $ / shares	46.06
Weighted Average Exercise Price, Outstanding at Ending | $ / shares	35.42
Weighted Average Exercise Price, Exercisable at Ending | $ / shares	$ 35.93
Weighted Average Remaining Contractual Term (Years), Outstanding at Ending	3 years 9 months 22 days
Weighted Average Remaining Contractual Term (Years), Exercisable at Ending	3 years 8 months 1 day
Aggregate Intrinsic Value, Outstanding at Ending | $	$ 582
Aggregate Intrinsic Value, Exercisable at Ending | $	$ 469

Share-Based Payment Arrangeme67

Share-Based Payment Arrangements (Summary of Nonvested Restricted and Performance Shares) (Details) - Restricted and Performance Shares [Member]	9 Months Ended
	Sep. 30, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Nonvested at Beginning | shares	2,196,145
Number of Shares, Granted | shares	106,403
Number of Shares, Vested | shares	(71,184)
Number of Shares, Forfeited | shares	(207,932)
Number of Shares, Nonvested at Ending | shares	2,023,432
Weighted Average Grant Date Fair Value, Nonvested at Beginning | $ / shares	$ 30.97
Weighted Average Grant Date Fair Value, Granted | $ / shares	25.15
Weighted Average Grant Date Fair Value, Vested | $ / shares	30.98
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	30.92
Weighted Average Grant Date Fair Value, Nonvested at Ending | $ / shares	$ 30.63

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - Investment Securities [Member] - Recurring [Member]	9 Months Ended
	Sep. 30, 2016
Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Targeted duration	2 years
Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Targeted duration	5 years

Fair Value (Financial Assets an

Fair Value (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		$ 2,414,680	$ 2,093,404
Derivative assets		1,352	224
Derivative liabilities		36,267	21,034
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		2,414,680	2,093,404
Derivative assets	[1]	36,554	23,251
Total recurring fair value measurements - assets		2,451,234	2,116,655
Derivative liabilities	[1]	37,899	23,968
Total recurring fair value measurements - liabilities		37,899	23,968
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		1,201	2,757
Total recurring fair value measurements - assets		1,201	2,757
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		2,413,479	2,090,647
Derivative assets	[1]	36,554	23,251
Total recurring fair value measurements - assets		2,450,033	2,113,898
Derivative liabilities	[1]	37,899	23,968
Total recurring fair value measurements - liabilities		37,899	23,968
Recurring [Member] | US Treasury and Government Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		20,671	134
Recurring [Member] | US Treasury and Government Agency Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		20,671	134
Recurring [Member] | Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		217,018	39,607
Recurring [Member] | Municipal Obligations [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		217,018	39,607
Recurring [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		3,500	3,500
Recurring [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		3,500	3,500
Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		1,775,925	1,758,373
Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		1,775,925	1,758,373
Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		173,109
Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		173,109
Recurring [Member] | Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		223,256	289,033
Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		223,256	289,033
Recurring [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		1,201	2,757
Recurring [Member] | Equity Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		$ 1,201	$ 2,757
[1]	For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.

Fair Value (Financial Assets Me

Fair Value (Financial Assets Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	$ 126,401	$ 93,602
Other real estate owned	14,626	17,206
Total nonrecurring fair value measurements	141,027	110,808
Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans
Other real estate owned
Total nonrecurring fair value measurements
Nonrecurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	126,401	93,602
Total nonrecurring fair value measurements	126,401	93,602
Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	14,626	17,206
Total nonrecurring fair value measurements	$ 14,626	$ 17,206

Fair Value (Estimated Fair Valu

Fair Value (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	$ 2,414,680	$ 2,093,404
Held to maturity securities	2,428,432	2,370,388
Derivative financial instruments	1,352	224
Derivative financial instruments	36,267	21,034
Total Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	458,792	869,429
Available for sale securities	2,414,680	2,093,404
Held to maturity securities	2,482,540	2,375,851
Loans, net	16,052,714	15,427,803
Loans held for sale	42,545	20,434
Derivative financial instruments	36,554	23,251
Deposits	18,885,148	18,327,425
Federal funds purchased	1,250	10,100
Securities sold under agreements to repurchase	335,894	513,544
FHLB borrowings	738,812	900,000
Long-term debt	468,091	488,711
Derivative financial instruments	37,899	23,968
Total Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	458,792	869,429
Available for sale securities	1,201	2,757
Federal funds purchased	1,250	10,100
Securities sold under agreements to repurchase	335,894	513,544
FHLB borrowings	738,812	900,000
Total Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	2,413,479	2,090,647
Held to maturity securities	2,482,540	2,375,851
Loans, net	126,401	93,602
Loans held for sale	42,545	20,434
Derivative financial instruments	36,554	23,251
Long-term debt	468,091	488,711
Derivative financial instruments	37,899	23,968
Total Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net	15,926,313	15,334,201
Deposits	18,885,148	18,327,425
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	458,792	869,429
Available for sale securities	2,414,680	2,093,404
Held to maturity securities	2,428,432	2,370,388
Loans, net	15,834,760	15,522,135
Loans held for sale	42,545	20,434
Derivative financial instruments	36,554	23,251
Deposits	18,885,477	18,348,912
Federal funds purchased	1,250	10,100
Securities sold under agreements to repurchase	335,894	513,544
FHLB borrowings	738,812	900,000
Long-term debt	463,710	490,145
Derivative financial instruments	$ 37,899	$ 23,968