Hancock Whitney Corporation - 6 (HWC) 10-Q 8 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Aug. 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	Q2
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		77,543,990

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 313,428	$ 303,874
Interest-bearing bank deposits	152,417	564,671
Federal funds sold	742	884
Securities available for sale, at fair value (amortized cost of $2,261,278 and $2,086,745)	2,308,812	2,093,404
Securities held to maturity (fair value of $2,569,084 and $2,375,851)	2,497,558	2,370,388
Loans held for sale	42,297	20,434
Loans	16,035,796	15,703,314
Less: allowance for loan losses	(226,086)	(181,179)
Loans, net	15,809,710	15,522,135
Property and equipment, net of accumulated depreciation of $223,046 and $209,763	366,402	377,015
Prepaid expenses	19,165	17,560
Other real estate, net	22,641	26,256
Accrued interest receivable	57,605	54,068
Goodwill	621,193	621,193
Other intangible assets, net	97,409	107,538
Life insurance contracts	477,051	434,550
FDIC loss share receivable	21,075	29,868
Deferred tax asset, net	68,107	75,830
Other assets	188,178	213,937
Total assets	23,063,790	22,833,605
Deposits:
Noninterest-bearing	7,151,416	7,276,127
Interest-bearing	11,665,453	11,072,785
Total deposits	18,816,869	18,348,912
Short-term borrowings	1,095,107	1,423,644
Long-term debt	468,028	490,145
Accrued interest payable	8,640	6,609
Other liabilities	211,781	151,152
Total liabilities	20,600,425	20,420,462
Stockholders' equity
Common Stock - $3.33 par value per share; 350,000,000 shares authorized, 77,538,260 and 77,496,429 outstanding	258,202	258,063
Capital surplus	1,693,667	1,684,101
Treasury shares at cost - 9,277,251 and 9,319,082 shares	(229,415)	(226,370)
Retained earnings	790,452	777,944
Accumulated other comprehensive loss, net	(49,541)	(80,595)
Total stockholders' equity	2,463,365	2,413,143
Total liabilities and stockholders' equity	$ 23,063,790	$ 22,833,605

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Consolidated Balance Sheets [Abstract]
Securities available for sale, amortized cost	$ 2,261,278	$ 2,086,745
Securities held to maturity, fair value	2,569,084	2,375,851
Property and equipment, accumulated depreciation	$ 223,046	$ 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	77,538,260	77,496,429
Treasury shares at cost, shares	9,277,251	9,319,082

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest income:
Loans, including fees	$ 156,717	$ 141,905	$ 310,830	$ 288,872
Loans held for sale	249	222	408	318
Securities-taxable	23,049	21,674	47,006	42,464
Securities-tax exempt	3,011	845	4,813	1,725
Short-term investments	480	274	1,090	628
Total interest income	183,506	164,920	364,147	334,007
Interest expense:
Deposits	12,603	7,621	24,336	14,747
Short-term borrowings	909	186	1,902	358
Long-term debt	5,025	5,322	10,104	8,953
Total interest expense	18,537	13,129	36,342	24,058
Net interest income	164,969	151,791	327,805	309,949
Provision for loan losses	17,196	6,608	77,232	12,762
Net interest income after provision for loan losses	147,773	145,183	250,573	297,187
Noninterest income:
Service charges on deposit accounts	18,394	17,908	36,777	35,223
Trust fees	12,089	11,795	23,313	22,995
Bank card and ATM fees	11,954	11,868	23,302	23,051
Investment and annuity fees	5,043	4,838	9,976	9,888
Secondary mortgage market operations	4,176	3,618	7,088	6,282
Insurance commissions and fees	1,240	2,595	2,547	4,349
Amortization of FDIC loss share receivable	(1,526)	(1,273)	(3,139)	(2,470)
Securities transactions	768		1,114	333
Other income	11,556	9,525	20,902	17,769
Total noninterest income	63,694	60,874	121,880	117,420
Noninterest expense:
Compensation expense	70,233	70,550	143,234	135,567
Employee benefits	14,004	12,870	29,718	28,504
Personnel expense	84,237	83,420	172,952	164,071
Net occupancy expense	10,394	11,804	20,750	22,981
Equipment expense	3,080	4,090	6,854	8,025
Data processing expense	14,370	14,012	28,577	27,568
Professional services expense	7,712	8,952	15,333	24,322
Amortization of intangibles	5,005	6,148	10,129	12,466
Telecommunications and postage	3,272	3,471	6,633	7,122
Deposit insurance and regulatory fees	6,049	4,213	11,446	7,808
Other real estate expense, net	350	501	1,118	957
Other expense	16,473	22,306	33,182	37,112
Total noninterest expense	150,942	158,917	306,974	312,432
Income before income taxes	60,525	47,140	65,479	102,175
Income taxes	13,618	12,311	14,733	27,187
Net income	$ 46,907	$ 34,829	$ 50,746	$ 74,988
Earnings per common share-basic	$ 0.59	$ 0.44	$ 0.64	$ 0.93
Earnings per common share-diluted	0.59	0.44	0.64	0.93
Dividends paid per share	$ 0.24	$ 0.24	$ 0.48	$ 0.48
Weighted average shares outstanding-basic	77,523	77,951	77,512	78,719
Weighted average shares outstanding-diluted	77,680	78,115	77,676	78,881

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 46,907	$ 34,829	$ 50,746	$ 74,988
Other comprehensive income:
Net change in unrealized gain (loss)	16,629	(18,370)	45,601	(12,957)
Reclassification adjustment for net losses realized and included in earnings	711	801	1,802	1,406
Valuation adjustment for employee benefit plans		(5,922)		(5,922)
Amortization of unrealized net gain on securities transferred to held to maturity	830	939	1,628	1,586
Other comprehensive income (loss) before income taxes	18,170	(22,552)	49,031	(15,887)
Income tax	6,645	(8,237)	17,977	(5,877)
Other comprehensive income (loss) net of income taxes	11,525	(14,315)	31,054	(10,010)
Comprehensive income	$ 58,432	$ 20,514	$ 81,800	$ 64,978

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			74,988			74,988
Other comprehensive income				(10,010)		(10,010)
Comprehensive income			74,988	(10,010)		64,978
Cash dividends declared ($0.48 per common share)			(38,704)			(38,704)
Common stock activity, long-term incentive plan	$ 769	16,240			(10,375)	6,634
Common stock activity, long-term incentive plan, Shares	230,851
Purchase of common stock under stock buyback program	$ (8,537)				(66,733)	(75,270)
Purchase of common stock under stock buyback program, Shares	(2,563,607)
Balance at Jun. 30, 2015	$ 260,052	1,705,531	759,780	(60,084)	(235,239)	2,430,040
Balance, Shares at Jun. 30, 2015	78,093,729
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			50,746			$ 50,746
Other comprehensive income				31,054		31,054
Comprehensive income			50,746	31,054		81,800
Cash dividends declared ($0.48 per common share)			(38,238)			(38,238)
Common stock activity, long-term incentive plan	$ 134	9,584			(3,094)	6,624
Common stock activity, long-term incentive plan, Shares	40,392
Issuance of stock from dividend reinvestment	$ 5	(18)			49	36
Issuance of stock from dividend reinvestment, Shares	1,439
Balance at Jun. 30, 2016	$ 258,202	$ 1,693,667	$ 790,452	$ (49,541)	$ (229,415)	$ 2,463,365
Balance, Shares at Jun. 30, 2016	77,538,260					77,538,260

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Retained Earnings [Member]
Cash dividends declared, per common share	$ 0.48	$ 0.48

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 50,746	$ 74,988
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,344	14,399
Provision for loan losses	77,232	12,762
Loss (gain) on other real estate owned	127	(374)
Deferred tax (benefit) expense	(10,663)	10,838
Increase in cash surrender value of life insurance contracts	(5,384)	(5,336)
(Gain) loss on disposal of other assets	(4,690)	1,694
Net increase in loans held for sale	(21,170)	(2,995)
Net amortization of securities premium/discount	12,905	9,741
Amortization of intangible assets	10,129	12,466
Amortization of FDIC indemnification asset	3,139	2,470
Stock-based compensation expense	7,164	6,353
Increase (decrease) in interest payable and other liabilities	(3,063)	(6,310)
Net payments (to) from FDIC for loss share claims	(159)	14,153
Decrease in FDIC loss share receivable	7,426	5,147
Decrease (increase) in other assets	37,117	(16,925)
Other, net	2,525	(2,338)
Net cash provided by operating activities	177,725	130,733
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities	102,335	9,230
Proceeds from maturities of securities available for sale	186,790	562,162
Purchases of securities available for sale	(461,139)	(1,083,192)
Proceeds from maturities of securities held to maturity	190,721	187,864
Purchases of securities held to maturity	(282,190)	(266,759)
Net decrease in short-term investments	412,396	204,493
Proceeds from sales of loans	106,660
Net increase in loans	(470,732)	(463,593)
Purchase of life insurance contracts	(40,000)
Purchases of property and equipment	(3,950)	(13,896)
Proceeds from sales of property and equipment	671	12,168
Proceeds from sales of other real estate	8,995	31,953
Other, net	2,989	(8,656)
Net cash used in investing activities	(246,454)	(828,226)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	467,973	728,957
Net decrease in short-term borrowings	(328,537)	(72,380)
Repayments of long-term debt	(28,836)	(17,600)
Net proceeds from issuance of long-term debt	5,885	145,296
Dividends paid	(38,238)	(38,704)
Purchase of common stock under stock buyback program		(75,270)
Proceeds from exercise of stock options		347
Issuance of stock from dividend reinvestment	36
Net cash provided by financing activities	78,283	670,646
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	9,554	(26,847)
CASH AND DUE FROM BANKS, BEGINNING	303,874	356,455
CASH AND DUE FROM BANKS, ENDING	313,428	329,608
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	$ 10,526	$ 10,390

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 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. 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. Effective this quarter, 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	6 Months Ended
	Jun. 30, 2016
Securities [Abstract]
Securities	2. Securities The amortized cost and fair value of securities classified as available for sale and held to maturity follow.      Securities Available for Sale  (in thousands) June 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 $ 116 $ — $ — $ 116 $ 135 $ — $ 1 $ 134  Municipal obligations 151,557 4,735 — 156,292 39,410 235 38 39,607  Mortgage-backed securities 1,867,063 39,413 130 1,906,346 1,750,168 19,387 11,182 1,758,373  Collateralized mortgage obligations 238,165 3,181 — 241,346 291,085 140 2,192 289,033  Corporate debt securities 3,500 — — 3,500 3,500 — — 3,500  Equity securities 877 335 — 1,212 2,447 358 48 2,757  $ 2,261,278 $ 47,664 $ 130 $ 2,308,812 $ 2,086,745 $ 20,120 $ 13,461 $ 2,093,404      Securities Held to Maturity  (in thousands) June 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 $ 1,047 $ — $ 51,047 $ 50,000 $ — $ 410 $ 49,590  Municipal obligations 496,999 18,158 372 514,785 185,890 3,475 1,166 188,199  Mortgage-backed securities 946,722 40,068 — 986,790 1,014,135 15,585 1,589 1,028,131  Collateralized mortgage obligations 1,003,837 13,543 918 1,016,462 1,120,363 2,244 12,676 1,109,931  $ 2,497,558 $ 72,816 $ 1,290 $ 2,569,084 $ 2,370,388 $ 21,304 $ 15,841 $ 2,375,851  The following table presents the amortized cost and fair value of debt securities at June 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 $ 6,825 $ 6,839  Due after one year through five years 53,816 54,914  Due after five years through ten years 391,388 405,008  Due after ten years 1,808,372 1,840,839  Total available for sale debt securities $ 2,260,401 $ 2,307,600   Amortized Fair  Debt Securities Held to Maturity Cost Value  Due in one year or less $ 15,700 $ 15,779  Due after one year through five years 136,327 140,424  Due after five years through ten years 403,112 416,795  Due after ten years 1,942,419 1,996,086  Total held to maturity securities $ 2,497,558 $ 2,569,084 The Company held no securities c lassified as trading at June 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  June 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  US Treasury and government agency securities $ — — $ 70 $ — $ 70 $ —  Mortgage-backed securities 13,310 90 7,929 40 21,239 130  $ 13,310 $ 90 $ 7,999 $ 40 $ 21,309 $ 130      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  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  June 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 $ — $ — $ 12,476 $ 372 $ 12,476 $ 372  Collateralized mortgage obligations 1,392 2 149,600 916 150,992 918  $ 1,392 $ 2 $ 162,076 $ 1,288 $ 163,468 $ 1,290      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  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 $102.3 million with an associated realized gain of $1.1 million and $9.2 million with an associated gain of $0.3 million for th e six months ended June 30, 2016 and 2015 , respectively. Securities with carrying values totaling $3.4 billion at June 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	6 Months Ended
	Jun. 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 .      June 30, December 31,  (in thousands) 2016 2015   Commercial non-real estate $ 7,132,519 $ 6,995,824  Commercial real estate - owner occupied 1,916,200 1,859,469  Total commercial & industrial 9,048,719 8,855,293  Commercial real estate - income producing 2,024,471 1,553,082  Construction and land development 880,588 1,151,950  Residential mortgages 2,017,650 2,049,524  Consumer 2,064,368 2,093,465  Total loans $ 16,035,796 $ 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, if secured, on 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 six months ended June 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   Six Months Ended June 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) (23) (8) (78)  Recoveries 8 120 128 2 53 3 106 292  Net provision for loan losses 79 (170) (91) 26 (117) 1,165 (1,290) (307)  Increase (decrease) in FDIC loss share receivable 39 — 39 — — (3,378) (98) (3,437)  Non-purchased credit impaired activity:  Charge-offs (22,212) (1,199) (23,411) (191) (592) (592) (11,268) (36,054)  Recoveries 1,802 238 2,040 268 1,125 480 3,039 6,952  Net provision for loan losses 61,628 1,857 63,485 6,654 (1,087) 466 8,021 77,539  Ending balance $ 150,772 $ 10,676 $ 161,448 $ 12,799 $ 5,006 $ 23,474 $ 23,359 $ 226,086  Ending balance:  Allowance:  Individually evaluated for impairment $ 12,885 $ 183 $ 13,068 $ 72 $ 1 $ 167 $ 41 $ 13,349  Amounts related to purchased credit impaired loans 572 1,015 1,587 741 575 15,430 1,257 19,590  Collectively evaluated for impairment 137,315 9,478 146,793 11,986 4,430 7,877 22,061 193,147  Total allowance $ 150,772 $ 10,676 $ 161,448 $ 12,799 $ 5,006 $ 23,474 $ 23,359 $ 226,086  Loans:  Individually evaluated for impairment $ 232,785 $ 5,898 $ 238,683 $ 7,803 $ 1,247 $ 1,068 $ 166 $ 248,967  Purchased credit impaired loans 10,483 15,428 25,911 10,752 8,761 151,674 12,826 209,924  Collectively evaluated for impairment 6,889,251 1,894,874 8,784,125 2,005,916 870,580 1,864,908 2,051,376 15,576,905  Total loans $ 7,132,519 $ 1,916,200 9,048,719 $ 2,024,471 $ 880,588 $ 2,017,650 $ 2,064,368 $ 16,035,796        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   Six Months ended June 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 (1,099) (15) (1,114) (2,353) (285) (168) (140) (4,060)  Recoveries 14 465 479 — 406 2 136 1,023  Net provision for loan losses 470 (1,171) (701) 1,102 (733) 272 (889) (949)  Increase (decrease) in FDIC loss share receivable 347 (396) (49) 919 (6) (3,296) (104) (2,536)  Non-purchased credit impaired activity:  Charge-offs (2,215) (378) (2,593) (147) (828) (1,292) (6,729) (11,589)  Recoveries 2,051 135 2,186 291 1,308 449 2,491 6,725  Net provision for loan losses 9,586 2,812 12,398 (1,858) (982) 62 4,091 13,711  Ending balance $ 60,323 $ 14,988 $ 75,311 $ 5,500 $ 5,301 $ 24,689 $ 20,286 $ 131,087  Ending balance:  Allowance:  Individually evaluated for impairment $ 2,903 $ 2,189 $ 5,092 $ 228 $ 73 $ 163 $ 6 $ 5,562  Amounts related to purchased credit impaired loans 643 1,639 2,282 973 390 17,419 2,998 24,062  Collectively evaluated for impairment 56,777 11,160 67,937 4,299 4,838 7,107 17,282 101,463  Total allowance $ 60,323 $ 14,988 $ 75,311 $ 5,500 $ 5,301 $ 24,689 $ 20,286 $ 131,087  Loans:  Individually evaluated for impairment $ 32,379 $ 21,701 $ 54,080 $ 12,682 $ 4,360 $ 1,369 $ 116 $ 72,607  Purchased credit impaired loans 13,667 24,775 38,442 15,563 19,465 171,107 14,860 259,437  Collectively evaluated for impairment 6,139,638 1,714,266 7,853,904 1,423,846 1,097,122 1,783,361 1,854,475 14,012,708  Total loans $ 6,185,684 $ 1,760,742 7,946,426 $ 1,452,091 $ 1,120,947 $ 1,955,837 $ 1,869,451 $ 14,344,752     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.      June 30, December 31,  (in thousands) 2016 2015  Commercial non-real estate $ 209,362 $ 88,743  Commercial real estate - owner occupied 11,761 10,001  Total commercial & industrial 221,123 98,744  Commercial real estate - income producing 9,011 10,815  Construction and land development 4,173 17,294  Residential mortgages 22,874 23,799  Consumer 8,541 9,061  Total loans $ 265,722 $ 159,713  Nonaccrual loans include loans modified in troubled debt restructurings (“TDRs”) of $34.8 million and $8.8 million at June 30 , 2016 and December 31, 2015, respectively. Total TDRs, both accruing and nonaccruing, were $70.8 million as of June 30 , 2016 and $13.1 million at December 31, 2015. The table below details TDRs that were modified during the six months ended June 30, 2016 and June 30, 2015 by portfolio class . The TDRs during the six months ended June 30, 2016 and 2015 were extended amortization, other modification of payment terms, or covenant violations. All are individually evaluated for impairment.      Six Months Ended  ($ in thousands) June 30, 2016 June 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 4 432 432 2 68 68  Consumer — — — 1 20 20  Total loans 21 $ 58,347 $ 58,347 4 $ 570 $ 570  No TDRs that subsequently defaulted within twelve months of modification were recorded in the six months ended June 30, 2016 or 2015. The tables below present loans that are individually evaluated for impairment disaggregated by portfolio class at June 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.      June 30, 2016  Recorded investment Recorded investment Unpaid  (in thousands) without an allowance with an allowance principal balance Related allowance  Commercial non-real estate $ 101,481 $ 131,304 $ 244,928 $ 12,885  Commercial real estate - owner occupied 3,323 2,575 6,285 183  Total commercial & industrial 104,804 133,879 251,213 13,068  Commercial real estate - income producing 5,265 2,538 8,034 72  Construction and land development 1,228 19 2,089 1  Residential mortgages — 1,068 1,709 167  Consumer — 166 166 41  Total loans $ 111,297 $ 137,670 $ 263,211 $ 13,349    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  June 30, 2016 June 30, 2015    Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 216,907 $ 493 $ 23,473 $ 1  Commercial real estate - owner occupied 5,959 14 14,565 12  Total commercial & industrial 222,866 507 38,038 13  Commercial real estate - income producing 8,242 22 12,521 26  Construction and land development 7,660 — 4,371 27  Residential mortgages 976 2 1,896 7  Consumer 112 1 119 1  Total loans $ 239,856 $ 532 $ 56,945 $ 74      Six Months Ended  June 30, 2016 June 30, 2015   Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 179,117 $ 847 $ 16,977 $ 3  Commercial real estate - owner occupied 5,836 29 12,628 23  Total commercial & industrial 184,953 876 29,605 26  Commercial real estate - income producing 9,072 43 10,366 41  Construction and land development 10,905 — 5,664 59  Residential mortgages 932 4 2,149 20  Consumer 109 2 81 3  Total loans $ 205,971 $ 925 $ 47,865 $ 149    Aging Analysis The tables below present the age analysis of past due loans by portfolio class at June 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  June 30, 2016 past due past due past due past due Current Loans still accruing  (in thousands)  Commercial non-real estate $ 47,859 $ 28,591 $ 29,000 $ 105,450 $ 7,027,069 $ 7,132,519 $ 567  Commercial real estate - owner occupied 2,451 2,106 7,149 11,706 1,904,494 1,916,200 1,495  Total commercial & industrial 50,310 30,697 36,149 117,156 8,931,563 9,048,719 2,062  Commercial real estate - income producing 2,583 467 2,777 5,827 2,018,644 2,024,471 194  Construction and land development 1,386 938 7,647 9,971 870,617 880,588 4,759  Residential mortgages 15,108 7,293 12,549 34,950 1,982,700 2,017,650 143  Consumer 12,012 4,459 6,107 22,578 2,041,790 2,064,368 824  Total $ 81,399 $ 43,854 $ 65,229 $ 190,482 $ 15,845,314 $ 16,035,796 $ 7,982      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 June 30, 2016 and December 31, 2015 .      June 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 $ 5,968,194 $ 1,743,672 $ 7,711,866 $ 1,961,653 $ 847,229 $ 10,520,748  Pass-Watch 252,605 39,586 292,191 15,764 16,355 324,310  Special Mention 250,226 37,151 287,377 8,412 537 296,326  Substandard 659,381 95,791 755,172 38,629 16,467 810,268  Doubtful 2,113 — 2,113 13 — 2,126  Total $ 7,132,519 $ 1,916,200 $ 9,048,719 $ 2,024,471 $ 880,588 $ 11,953,778   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         June 30, 2016 December 31, 2015  (in thousands) Residential mortgage Consumer Total Residential mortgage Consumer Total  Performing $ 1,994,633 $ 2,055,003 $ 4,049,636 $ 2,025,563 $ 2,082,238 $ 4,107,801  Nonperforming 23,017 9,365 32,382 23,961 11,227 35,188  Total $ 2,017,650 $ 2,064,368 $ 4,082,018 $ 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 an 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 due to the FDIC. The loss share agreement covering the single family portfolio expires in December 2019. As of June 30, 2016 and June 30, 2015, loans totaling $160.0 million and $170.1 million, respectively, remain 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 six months ended June 30, 2016 and 201 5 .      Six Months Ended  June 30, June 30,  (in thousands) 2016 2015  Beginning Balance $ 29,868 $ 60,272  Amortization (3,139) (2,470)  Charge-offs, write-downs and other recoveries (2,683) (4,667)  External expenses qualifying under loss share agreement 307 482  Changes due to changes in cash flow projections (3,437) (2,536)  FDIC resolution of denied claims — (1,854)  Net payments to (from) FDIC 159 (14,153)  Ending balance $ 21,075 $ 35,074   Changes in the carrying amount of purchased credit impaired loans and related accretable yield are presented in the following table for the six months ended June 30, 2016 and the year ended December 31, 2015 .      June 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 (26,541) (6,581) (115,847) (21,978)  Accretion 10,627 (10,627) 28,000 (28,000)  Increase (decrease) in expected cash flows based on actual cash flows and changes in cash flow assumptions — 5,107 — (4,238)  Net transfers from nonaccretable  Net transfers to (from) nonaccretable difference to accretable yield — 8,997 — (3,752)  Balance at end of period $ 209,924 $ 126,384 $ 225,838 $ 129,488    Residential Mortgage Loans in Process of Foreclosure  Included in loans are $7.1 million and $7.4 million of consumer loans secured by single family residential real estate that are in process of foreclosure as of June 30, 2016 and December 31, 2015, respectively. Of these loans, $3.6 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 $5.9 million and $9.3 million of foreclosed single family residential properties in other real estate owned as of June 30, 2016 and December 31, 2015 , respectively. Of these foreclosed properties, $0.7 million and $1.6 million as of June 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	6 Months Ended
	Jun. 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 June 30, 2016 was $409.5 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 daily, the Company’s risk is very limited.

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 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:      June 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 116,050 125,000  Other long-term debt 112,224 122,988  Less unamortized debt issuance costs (5,757) (5,854)  Total long-term debt less unamortized debt issuance costs $ 468,028 $ 490,145  Long-term debt with its related unamortized debt issuance cost at June 30, 2016 is presented in the following table:   Long-term debt at June 30, 2016, consisted of the following:  Unamortized  Debt  Issuance  (in thousands) Principal Costs  Subordinated notes payable, maturing June 2045 $ 150,000 $ 5,044  Subordinated notes payable, maturing April 2017 95,511 -  Term note payable, maturing December 2018 116,050 713  Other long-term debt 112,224 -  Total $ 473,785 5,757  

Derivatives

Derivatives	6 Months Ended
	Jun. 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 their net risk exposure resulting from such agreements. The Bank also enters into risk participation agreements under which they may either sell or buy credit risk associated with a customer’s performance under certain interest rate derivative contracts related to loans in which participation interests have been sold to or purchased from other banks. Fair Values of Derivative Instruments on the Balance Sheet The table below presents the notional amounts and fair values of the Company’s derivative financial instruments as well as their classification on the consolidated balance sheets as of June 30, 2016 and December 31, 2015 .      Fair Values (1)  Notional Amounts Assets Liabilities  Type of June 30, December 31, June 30, December 31, June 30, December 31,  (in thousands) Hedge 2016 2015 2016 2015 2016 2015  Derivatives designated as hedging instruments:  Interest rate swaps Cash Flow $ 800,000 $ 500,000 $ 3,330 $ — $ — $ 281  $ 800,000 $ 500,000 $ 3,330 $ — $ — $ 281  Derivatives not designated as hedging instruments:  Interest rate swaps (2) N/A $ 856,332 $ 780,871 $ 38,389 $ 20,622 $ 40,202 $ 21,007  Risk participation agreements N/A 88,946 83,430 114 83 243 162  Forward commitments to sell residential mortgage loans N/A 105,357 55,128 23 263 1,404 336  Interest rate-lock commitments on residential mortgage loans N/A 62,622 38,853 703 243 12 167  Foreign exchange forward contracts N/A 35,022 44,068 1,344 2,040 1,323 2,015  $ 1,148,279 $ 1,002,350 $ 40,573 $ 23,251 $ 43,184 $ 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 five 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 pays at a variable rate. The five swap agreements expire as follows: notional amount of $300 million expires in January 2017 ; n otional amount of $200 million expires in June 2017 ; and three contracts each with notional amounts of $100 million expire in April 2018 , 2019 , and 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 $0.4 million and $1.4 million for the six months ended June 30, 2016 and 2015, respectively. The impact to interest income from cash flow hedges was $1.0 million and $0.8 million for the six months ended June 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 June 30, 2016 , the aggregate fair value of derivative instruments with credit risk-related contingent features that were in a net liability position was $40.7 million, for which the Bank had posted collateral of $40.2 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 June 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 June 30, 2016  Derivative Assets $ 3,579 $ — $ 3,579 $ 3,579 $ — $ —   Derivative Liabilities $ 40,699 $ — $ 40,699 $ 3,579 $ 40,202 $ (3,082)      (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	6 Months Ended
	Jun. 30, 2016
Stockholders' Equity [Abstract]
Stockholders' Equity	 7. Stockholders’ Equity Stock Repurchase Program On August 28, 2015, the Company’s board of directors approved a stock repurchase plan that authorizes the repurchase of up to 5% , or approximately 3.9 million shares of its outstanding common stock. The approved plan allows 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 until September 30, 2016 . Under this plan, the Company has repurchased 741,393 shares of its common stock at an average price of $27. 44 per share through June 30, 2016. There were no shares of common stock repurchased during the first half of 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 (loss) gain (13,962) — — 1,005 (12,957)  Reclassification of net (gain) losses realized and included in earnings (165) — 1,571 — 1,406  Valuation adjustment for employee benefit plans — — (5,922) — (5,922)  Amortization of unrealized net loss on securities transferred to HTM — 1,586 — — 1,586  Income tax (benefit) expense (5,249) 580 (1,574) 366 (5,877)  Balance, June 30, 2015 $ 9,123 $ (18,068) $ (51,403) $ 264 $ (60,084)  Balance, December 31, 2015 $ 4,268 $ (16,795) $ (67,890) $ (178) $ (80,595)  Other comprehensive income before income taxes:  Net change in unrealized gain 41,990 — — 3,611 45,601  Reclassification of net (gain) losses realized and included in earnings (1,114) — 2,916 — 1,802  Amortization of unrealized net loss on securities transferred to HTM — 1,628 — — 1,628  Income tax expense 14,970 625 1,066 1,316 17,977  Balance, June 30, 2016 $ 30,174 $ (15,792) $ (66,040) $ 2,117 $ (49,541)  The following table shows the line items in the consolidated income statements affected by amounts reclassified from accumulated other comprehensive income.      Six Months Ended   Amount reclassified from AOCI (a) June 30, Affected line item on   (in thousands) 2016 2015 the income statement  Gain on sale of AFS securities $ 1,114 $ 165 Securities transactions  Tax effect (390) (58) Income taxes  Net of tax 724 107 Net income  Amortization of unrealized net loss on securities transferred to HTM (1,628) (1,586) Interest income  Tax effect 625 580 Income taxes  Net of tax (1,003) (1,006) Net income  Amortization of defined benefit pension and post-retirement items (2,916) (1,571) Employee benefits expense (b)  Tax effect 1,066 550 Income taxes  Net of tax (1,850) (1,021) Net income  Total reclassifications, net of tax $ (2,129) $ (1,920) 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	6 Months Ended
	Jun. 30, 2016
Other Noninterest Income [Abstract]
Other Noninterest Income	8. Other Noninterest Income Components of other noninterest income are as follows.          Three Months Ended Six Months Ended   June 30, June 30,   (in thousands) 2016 2015 2016 2015  Income from bank-owned life insurance $ 4,501 $ 2,671 $ 7,051 $ 5,337  Credit related fees 2,267 2,611 4,624 5,068  Derivative income 533 1,464 394 1,412  Net gain (loss) on sale of assets 1,801 (62) 3,566 (55)  Safety deposit box income 413 429 891 915  Other miscellaneous 2,041 2,412 4,376 5,092  Total other noninterest income $ 11,556 $ 9,525 $ 20,902 $ 17,769  

Other Noninterest Expense

Other Noninterest Expense	6 Months Ended
	Jun. 30, 2016
Other Noninterest Expense [Abstract]
Other Noninterest Expense	9. Other Noninterest Expense Components of other noninterest expense are as follows.      Three Months Ended Six Months Ended   June 30, June 30,   (in thousands) 2016 2015 2016 2015  Advertising $ 2,693 $ 2,133 $ 5,050 $ 4,298  Ad valorem and franchise taxes 2,340 2,736 4,643 5,451  Printing and supplies 1,065 1,158 2,176 2,375  Insurance expense 829 928 1,664 1,850  Travel expense 1,079 1,308 2,028 2,527  Entertainment and contributions 2,001 1,736 3,633 3,375  Tax credit investment amortization 1,833 2,096 3,576 4,191  Other miscellaneous 4,633 10,211 10,412 13,045  Total other noninterest expense $ 16,473 $ 22,306 $ 33,182 $ 37,112 

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 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 Six Months Ended  June 30, June 30,  (in thousands, except per share data) 2016 2015 2016 2015  Numerator:  Net income to common shareholders $ 46,907 $ 34,829 $ 50,746 $ 74,988  Net income allocated to participating securities - basic and diluted 1,136 766 1,233 1,701  Net income allocated to common shareholders - basic and diluted $ 45,771 $ 34,063 $ 49,513 $ 73,287  Denominator:  Weighted-average common shares - basic $ 77,523 $ 77,951 $ 77,512 $ 78,719  Dilutive potential common shares 157 164 164 162  Weighted-average common shares - diluted $ 77,680 $ 78,115 $ 77,676 $ 78,881  Earnings per common share:  Basic $ 0.59 $ 0.44 $ 0.64 $ 0.93  Diluted $ 0.59 $ 0.44 $ 0.64 $ 0.93  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 548,821 and 574,037 , respectively, for the three months ended June 30, 2016 and June 30 , 2015. Weighted-average anti-dilutive potential common shares totaled 602,809 and 843,544 , respectively , for the six months ended June 30, 2016 and June 30, 2015.

Retirement Plans

Retirement Plans	6 Months Ended
	Jun. 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 June 30, 2016 2016 2015 2016 2015  Service cost $ 3,611 $ 3,382 $ 45 $ 22  Interest cost 4,023 4,672 203 174  Expected return on plan assets (8,554) (8,206) — —  Amortization of net loss 1,426 842 53 (40)  Net periodic benefit cost $ 506 $ 690 $ 301 $ 156   Six Months Ended June 30, 2016  Service cost $ 6,876 $ 6,745 $ 74 $ 72  Interest cost 9,011 9,291 409 543  Expected return on plan assets (17,445) (16,419) — —  Amortization of net loss 2,894 1,486 22 85  Net periodic benefit cost $ 1,336 $ 1,103 $ 505 $ 700   N o contribution is required in 201 6 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	6 Months Ended
	Jun. 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 six months ended June 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  Cancelled/Forfeited (60,377) 35.04  Expired (150,847) 46.06  Outstanding at June 30, 2016 534,582 $ 35.43 4.06 $ —  Exercisable at June 30, 2016 490,827 $ 35.92 3.92 $ —  The re was no total intrinsic value of options exercised at June 30, 2016 compared to $0.2 million a t June 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 June 30, 2016 and changes during the six months ended June 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 85,004 23.83  Vested (64,112) 31.15  Forfeited (185,249) 30.84  Nonvested at June 30, 2016 2,031,788 $ 30.64  As of June 30, 2016 , there were $37.0 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 3.2 years. The total fair value of shares which vested during the six months ended June 30, 2016 and 2015 was $2.0 million and $7.5 million, respectively. During the six months ended June 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	6 Months Ended
	Jun. 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.     June 30, 2016  (in thousands) Level 1 Level 2 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 116 $ 116  Municipal obligations — 156,292 156,292  Corporate debt securities — 3,500 3,500  Mortgage-backed securities — 1,906,346 1,906,346  Collateralized mortgage obligations — 241,346 241,346  Equity securities 1,212 — 1,212  Total available for sale securities 1,212 2,307,600 2,308,812  Derivative assets (1) — 43,903 43,903  Total recurring fair value measurements - assets $ 1,212 $ 2,351,503 $ 2,352,715  Liabilities  Derivative liabilities (1) $ — $ 43,184 $ 43,184  Total recurring fair value measurements - liabilities $ — $ 43,184 $ 43,184  (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  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 U.S. Treasury securities and certain other debt and equity securities. 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 . 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.      June 30, 2016  (in thousands) Level 1 Level 2 Level 3 Total  Collateral-dependent impaired loans $ — $ 116,516 $ — $ 116,516  Other real estate owned — — 14,053 14,053  Total nonrecurring fair value measurements $ — $ 116,516 $ 14,053 $ 130,569      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 June 30, 2016 and December 31, 2015 .      June 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 $ 466,587 $ — $ — $ 466,587 $ 466,587  Available for sale securities 1,212 2,307,600 — 2,308,812 2,308,812  Held to maturity securities — 2,569,084 — 2,569,084 2,497,558  Loans, net — 116,516 16,058,354 16,174,870 15,809,710  Loans held for sale — 42,297 — 42,297 42,297  Derivative financial instruments — 43,903 — 43,903 43,903  Financial liabilities:  Deposits $ — $ — $ 18,837,146 $ 18,837,146 $ 18,816,869  Federal funds purchased 10,575 — — 10,575 10,575  Securities sold under agreements to repurchase 409,532 — — 409,532 409,532  FHLB borrowings 675,000 — — 675,000 675,000  Long-term debt — 474,888 — 474,888 468,028  Derivative financial instruments — 43,184 — 43,184 43,184      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	6 Months Ended
	Jun. 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 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 March 2016, the FASB issued ASU 2016-07 “Investments —Equity Method and Joint Ventures (Topic 323)” that simplifies the transition to the equity method of accounting. The amendments affect all entities that have an investment that becomes qualified for the equity method of accounting as a result of an increase in the level of ownership interest or degree of influence. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. The amendments require that an entity that has an available for sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. The amendments are effective for all entities for fiscal years beginning after December 15, 2016. The Company is currently assessing this pronouncement and the adoption of this guidance is not expected to have a material impact on the Company’s financial condition or results of operations.  In March 2016, the FASB issued ASU 2016-06 “Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments” that requires embedded derivatives to be separated from the host contract and accounted for separately as derivatives if certain criteria are met. The amendments apply to all entities that are issuers of or investors in debt instruments (or hybrid financial instruments that are determined to have a debt host) with embedded call (put) options. The amendments clarify what steps are required when assessing whether the economic characteristics and risks or call (put) options are clearly and closely related to the economic characteristics and risks of their debt hosts, which is one of the criteria for bifurcating an embedded derivative. Consequently, when a call (put) option is contingently exercisable, an entity does not have to assess whether the event that triggers the ability to exercise a call (put) option is related to interest rates or credits risks. Public business entities must apply the new requirements for fiscal years beginning after December 15, 2016 and interim periods within those fiscal years. Early adoption is permitted. The Company is currently assessing this pronouncement and the adoption of this guidance is not expected to have a material impact on the Company’s financial condition or results of operations.  In March 2016, the FASB issued ASU 2016-05 “Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships” that clarifies that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument does not, in and of itself, require dedesignation of that hedging relationship. The amendments apply to all reporting entities for which there is a change in the counterparty to a derivative instrument that has been designated as a hedging instrument. The amendments are effective for public business entities for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. The amendments may be applied on either a prospective basis or a modified retrospective basis. The Company is currently assessing this pronouncement and t he adoption of this guidance is not expected to have a material impact on the Company’s financial condition or results of operations.   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 and 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)” regarding revenue from contracts with customers 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; and clarified guidance for identifying performance obligations allowing entities to ignore immaterial promised goods and services in the context of a contract with a customer. 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 is cu rrently assessing this pronouncement and the adoption of 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)	6 Months Ended
	Jun. 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. 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. Effective this quarter, 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)	6 Months Ended
	Jun. 30, 2016
Gain (Loss) on Investments [Line Items]
Amortized Cost and Fair Value of Securities Available for Sale	   Securities Available for Sale  (in thousands) June 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 $ 116 $ — $ — $ 116 $ 135 $ — $ 1 $ 134  Municipal obligations 151,557 4,735 — 156,292 39,410 235 38 39,607  Mortgage-backed securities 1,867,063 39,413 130 1,906,346 1,750,168 19,387 11,182 1,758,373  Collateralized mortgage obligations 238,165 3,181 — 241,346 291,085 140 2,192 289,033  Corporate debt securities 3,500 — — 3,500 3,500 — — 3,500  Equity securities 877 335 — 1,212 2,447 358 48 2,757  $ 2,261,278 $ 47,664 $ 130 $ 2,308,812 $ 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) June 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 $ 1,047 $ — $ 51,047 $ 50,000 $ — $ 410 $ 49,590  Municipal obligations 496,999 18,158 372 514,785 185,890 3,475 1,166 188,199  Mortgage-backed securities 946,722 40,068 — 986,790 1,014,135 15,585 1,589 1,028,131  Collateralized mortgage obligations 1,003,837 13,543 918 1,016,462 1,120,363 2,244 12,676 1,109,931  $ 2,497,558 $ 72,816 $ 1,290 $ 2,569,084 $ 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 $ 6,825 $ 6,839  Due after one year through five years 53,816 54,914  Due after five years through ten years 391,388 405,008  Due after ten years 1,808,372 1,840,839  Total available for sale debt securities $ 2,260,401 $ 2,307,600   Amortized Fair  Debt Securities Held to Maturity Cost Value  Due in one year or less $ 15,700 $ 15,779  Due after one year through five years 136,327 140,424  Due after five years through ten years 403,112 416,795  Due after ten years 1,942,419 1,996,086  Total held to maturity securities $ 2,497,558 $ 2,569,084 
Available for Sale [Member]
Gain (Loss) on Investments [Line Items]
Securities with Unrealized Losses	   Available for Sale  June 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  US Treasury and government agency securities $ — — $ 70 $ — $ 70 $ —  Mortgage-backed securities 13,310 90 7,929 40 21,239 130  $ 13,310 $ 90 $ 7,999 $ 40 $ 21,309 $ 130      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  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  June 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 $ — $ — $ 12,476 $ 372 $ 12,476 $ 372  Collateralized mortgage obligations 1,392 2 149,600 916 150,992 918  $ 1,392 $ 2 $ 162,076 $ 1,288 $ 163,468 $ 1,290      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  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)	6 Months Ended
	Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Net of Unearned Income	   June 30, December 31,  (in thousands) 2016 2015   Commercial non-real estate $ 7,132,519 $ 6,995,824  Commercial real estate - owner occupied 1,916,200 1,859,469  Total commercial & industrial 9,048,719 8,855,293  Commercial real estate - income producing 2,024,471 1,553,082  Construction and land development 880,588 1,151,950  Residential mortgages 2,017,650 2,049,524  Consumer 2,064,368 2,093,465  Total loans $ 16,035,796 $ 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   Six Months Ended June 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) (23) (8) (78)  Recoveries 8 120 128 2 53 3 106 292  Net provision for loan losses 79 (170) (91) 26 (117) 1,165 (1,290) (307)  Increase (decrease) in FDIC loss share receivable 39 — 39 — — (3,378) (98) (3,437)  Non-purchased credit impaired activity:  Charge-offs (22,212) (1,199) (23,411) (191) (592) (592) (11,268) (36,054)  Recoveries 1,802 238 2,040 268 1,125 480 3,039 6,952  Net provision for loan losses 61,628 1,857 63,485 6,654 (1,087) 466 8,021 77,539  Ending balance $ 150,772 $ 10,676 $ 161,448 $ 12,799 $ 5,006 $ 23,474 $ 23,359 $ 226,086  Ending balance:  Allowance:  Individually evaluated for impairment $ 12,885 $ 183 $ 13,068 $ 72 $ 1 $ 167 $ 41 $ 13,349  Amounts related to purchased credit impaired loans 572 1,015 1,587 741 575 15,430 1,257 19,590  Collectively evaluated for impairment 137,315 9,478 146,793 11,986 4,430 7,877 22,061 193,147  Total allowance $ 150,772 $ 10,676 $ 161,448 $ 12,799 $ 5,006 $ 23,474 $ 23,359 $ 226,086  Loans:  Individually evaluated for impairment $ 232,785 $ 5,898 $ 238,683 $ 7,803 $ 1,247 $ 1,068 $ 166 $ 248,967  Purchased credit impaired loans 10,483 15,428 25,911 10,752 8,761 151,674 12,826 209,924  Collectively evaluated for impairment 6,889,251 1,894,874 8,784,125 2,005,916 870,580 1,864,908 2,051,376 15,576,905  Total loans $ 7,132,519 $ 1,916,200 9,048,719 $ 2,024,471 $ 880,588 $ 2,017,650 $ 2,064,368 $ 16,035,796        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   Six Months ended June 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 (1,099) (15) (1,114) (2,353) (285) (168) (140) (4,060)  Recoveries 14 465 479 — 406 2 136 1,023  Net provision for loan losses 470 (1,171) (701) 1,102 (733) 272 (889) (949)  Increase (decrease) in FDIC loss share receivable 347 (396) (49) 919 (6) (3,296) (104) (2,536)  Non-purchased credit impaired activity:  Charge-offs (2,215) (378) (2,593) (147) (828) (1,292) (6,729) (11,589)  Recoveries 2,051 135 2,186 291 1,308 449 2,491 6,725  Net provision for loan losses 9,586 2,812 12,398 (1,858) (982) 62 4,091 13,711  Ending balance $ 60,323 $ 14,988 $ 75,311 $ 5,500 $ 5,301 $ 24,689 $ 20,286 $ 131,087  Ending balance:  Allowance:  Individually evaluated for impairment $ 2,903 $ 2,189 $ 5,092 $ 228 $ 73 $ 163 $ 6 $ 5,562  Amounts related to purchased credit impaired loans 643 1,639 2,282 973 390 17,419 2,998 24,062  Collectively evaluated for impairment 56,777 11,160 67,937 4,299 4,838 7,107 17,282 101,463  Total allowance $ 60,323 $ 14,988 $ 75,311 $ 5,500 $ 5,301 $ 24,689 $ 20,286 $ 131,087  Loans:  Individually evaluated for impairment $ 32,379 $ 21,701 $ 54,080 $ 12,682 $ 4,360 $ 1,369 $ 116 $ 72,607  Purchased credit impaired loans 13,667 24,775 38,442 15,563 19,465 171,107 14,860 259,437  Collectively evaluated for impairment 6,139,638 1,714,266 7,853,904 1,423,846 1,097,122 1,783,361 1,854,475 14,012,708  Total loans $ 6,185,684 $ 1,760,742 7,946,426 $ 1,452,091 $ 1,120,947 $ 1,955,837 $ 1,869,451 $ 14,344,752  
Composition of Nonaccrual Loans by Portfolio Class	   June 30, December 31,  (in thousands) 2016 2015  Commercial non-real estate $ 209,362 $ 88,743  Commercial real estate - owner occupied 11,761 10,001  Total commercial & industrial 221,123 98,744  Commercial real estate - income producing 9,011 10,815  Construction and land development 4,173 17,294  Residential mortgages 22,874 23,799  Consumer 8,541 9,061  Total loans $ 265,722 $ 159,713 
Troubled Debt Restructurings Modified by Portfolio Class	   Six Months Ended  ($ in thousands) June 30, 2016 June 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 4 432 432 2 68 68  Consumer — — — 1 20 20  Total loans 21 $ 58,347 $ 58,347 4 $ 570 $ 570 
Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class	   June 30, 2016  Recorded investment Recorded investment Unpaid  (in thousands) without an allowance with an allowance principal balance Related allowance  Commercial non-real estate $ 101,481 $ 131,304 $ 244,928 $ 12,885  Commercial real estate - owner occupied 3,323 2,575 6,285 183  Total commercial & industrial 104,804 133,879 251,213 13,068  Commercial real estate - income producing 5,265 2,538 8,034 72  Construction and land development 1,228 19 2,089 1  Residential mortgages — 1,068 1,709 167  Consumer — 166 166 41  Total loans $ 111,297 $ 137,670 $ 263,211 $ 13,349    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  June 30, 2016 June 30, 2015    Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 216,907 $ 493 $ 23,473 $ 1  Commercial real estate - owner occupied 5,959 14 14,565 12  Total commercial & industrial 222,866 507 38,038 13  Commercial real estate - income producing 8,242 22 12,521 26  Construction and land development 7,660 — 4,371 27  Residential mortgages 976 2 1,896 7  Consumer 112 1 119 1  Total loans $ 239,856 $ 532 $ 56,945 $ 74      Six Months Ended  June 30, 2016 June 30, 2015   Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 179,117 $ 847 $ 16,977 $ 3  Commercial real estate - owner occupied 5,836 29 12,628 23  Total commercial & industrial 184,953 876 29,605 26  Commercial real estate - income producing 9,072 43 10,366 41  Construction and land development 10,905 — 5,664 59  Residential mortgages 932 4 2,149 20  Consumer 109 2 81 3  Total loans $ 205,971 $ 925 $ 47,865 $ 149 
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  June 30, 2016 past due past due past due past due Current Loans still accruing  (in thousands)  Commercial non-real estate $ 47,859 $ 28,591 $ 29,000 $ 105,450 $ 7,027,069 $ 7,132,519 $ 567  Commercial real estate - owner occupied 2,451 2,106 7,149 11,706 1,904,494 1,916,200 1,495  Total commercial & industrial 50,310 30,697 36,149 117,156 8,931,563 9,048,719 2,062  Commercial real estate - income producing 2,583 467 2,777 5,827 2,018,644 2,024,471 194  Construction and land development 1,386 938 7,647 9,971 870,617 880,588 4,759  Residential mortgages 15,108 7,293 12,549 34,950 1,982,700 2,017,650 143  Consumer 12,012 4,459 6,107 22,578 2,041,790 2,064,368 824  Total $ 81,399 $ 43,854 $ 65,229 $ 190,482 $ 15,845,314 $ 16,035,796 $ 7,982      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	   Six Months Ended  June 30, June 30,  (in thousands) 2016 2015  Beginning Balance $ 29,868 $ 60,272  Amortization (3,139) (2,470)  Charge-offs, write-downs and other recoveries (2,683) (4,667)  External expenses qualifying under loss share agreement 307 482  Changes due to changes in cash flow projections (3,437) (2,536)  FDIC resolution of denied claims — (1,854)  Net payments to (from) FDIC 159 (14,153)  Ending balance $ 21,075 $ 35,074 
Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield	   June 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 (26,541) (6,581) (115,847) (21,978)  Accretion 10,627 (10,627) 28,000 (28,000)  Increase (decrease) in expected cash flows based on actual cash flows and changes in cash flow assumptions — 5,107 — (4,238)  Net transfers from nonaccretable  Net transfers to (from) nonaccretable difference to accretable yield — 8,997 — (3,752)  Balance at end of period $ 209,924 $ 126,384 $ 225,838 $ 129,488 
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit Quality Indicators by Segments and Portfolio Class	   June 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 $ 5,968,194 $ 1,743,672 $ 7,711,866 $ 1,961,653 $ 847,229 $ 10,520,748  Pass-Watch 252,605 39,586 292,191 15,764 16,355 324,310  Special Mention 250,226 37,151 287,377 8,412 537 296,326  Substandard 659,381 95,791 755,172 38,629 16,467 810,268  Doubtful 2,113 — 2,113 13 — 2,126  Total $ 7,132,519 $ 1,916,200 $ 9,048,719 $ 2,024,471 $ 880,588 $ 11,953,778   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	   June 30, 2016 December 31, 2015  (in thousands) Residential mortgage Consumer Total Residential mortgage Consumer Total  Performing $ 1,994,633 $ 2,055,003 $ 4,049,636 $ 2,025,563 $ 2,082,238 $ 4,107,801  Nonperforming 23,017 9,365 32,382 23,961 11,227 35,188  Total $ 2,017,650 $ 2,064,368 $ 4,082,018 $ 2,049,524 $ 2,093,465 $ 4,142,989 

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2016
Long-Term Debt [Abstract]
Long-Term Debt	Long-term debt consisted of the following:      June 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 116,050 125,000  Other long-term debt 112,224 122,988  Less unamortized debt issuance costs (5,757) (5,854)  Total long-term debt less unamortized debt issuance costs $ 468,028 $ 490,145  Long-term debt with its related unamortized debt issuance cost at June 30, 2016 is presented in the following table:   Long-term debt at June 30, 2016, consisted of the following:  Unamortized  Debt  Issuance  (in thousands) Principal Costs  Subordinated notes payable, maturing June 2045 $ 150,000 $ 5,044  Subordinated notes payable, maturing April 2017 95,511 -  Term note payable, maturing December 2018 116,050 713  Other long-term debt 112,224 -  Total $ 473,785 5,757 

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
	Jun. 30, 2016
Derivatives [Abstract]
Fair Values of Derivative Financial Instruments	   Fair Values (1)  Notional Amounts Assets Liabilities  Type of June 30, December 31, June 30, December 31, June 30, December 31,  (in thousands) Hedge 2016 2015 2016 2015 2016 2015  Derivatives designated as hedging instruments:  Interest rate swaps Cash Flow $ 800,000 $ 500,000 $ 3,330 $ — $ — $ 281  $ 800,000 $ 500,000 $ 3,330 $ — $ — $ 281  Derivatives not designated as hedging instruments:  Interest rate swaps (2) N/A $ 856,332 $ 780,871 $ 38,389 $ 20,622 $ 40,202 $ 21,007  Risk participation agreements N/A 88,946 83,430 114 83 243 162  Forward commitments to sell residential mortgage loans N/A 105,357 55,128 23 263 1,404 336  Interest rate-lock commitments on residential mortgage loans N/A 62,622 38,853 703 243 12 167  Foreign exchange forward contracts N/A 35,022 44,068 1,344 2,040 1,323 2,015  $ 1,148,279 $ 1,002,350 $ 40,573 $ 23,251 $ 43,184 $ 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 June 30, 2016  Derivative Assets $ 3,579 $ — $ 3,579 $ 3,579 $ — $ —   Derivative Liabilities $ 40,699 $ — $ 40,699 $ 3,579 $ 40,202 $ (3,082)      (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)	6 Months Ended
	Jun. 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 (loss) gain (13,962) — — 1,005 (12,957)  Reclassification of net (gain) losses realized and included in earnings (165) — 1,571 — 1,406  Valuation adjustment for employee benefit plans — — (5,922) — (5,922)  Amortization of unrealized net loss on securities transferred to HTM — 1,586 — — 1,586  Income tax (benefit) expense (5,249) 580 (1,574) 366 (5,877)  Balance, June 30, 2015 $ 9,123 $ (18,068) $ (51,403) $ 264 $ (60,084)  Balance, December 31, 2015 $ 4,268 $ (16,795) $ (67,890) $ (178) $ (80,595)  Other comprehensive income before income taxes:  Net change in unrealized gain 41,990 — — 3,611 45,601  Reclassification of net (gain) losses realized and included in earnings (1,114) — 2,916 — 1,802  Amortization of unrealized net loss on securities transferred to HTM — 1,628 — — 1,628  Income tax expense 14,970 625 1,066 1,316 17,977  Balance, June 30, 2016 $ 30,174 $ (15,792) $ (66,040) $ 2,117 $ (49,541) 
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income	   Six Months Ended   Amount reclassified from AOCI (a) June 30, Affected line item on   (in thousands) 2016 2015 the income statement  Gain on sale of AFS securities $ 1,114 $ 165 Securities transactions  Tax effect (390) (58) Income taxes  Net of tax 724 107 Net income  Amortization of unrealized net loss on securities transferred to HTM (1,628) (1,586) Interest income  Tax effect 625 580 Income taxes  Net of tax (1,003) (1,006) Net income  Amortization of defined benefit pension and post-retirement items (2,916) (1,571) Employee benefits expense (b)  Tax effect 1,066 550 Income taxes  Net of tax (1,850) (1,021) Net income  Total reclassifications, net of tax $ (2,129) $ (1,920) 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)	6 Months Ended
	Jun. 30, 2016
Other Noninterest Income [Abstract]
Components of Other Noninterest Income	   Three Months Ended Six Months Ended   June 30, June 30,   (in thousands) 2016 2015 2016 2015  Income from bank-owned life insurance $ 4,501 $ 2,671 $ 7,051 $ 5,337  Credit related fees 2,267 2,611 4,624 5,068  Derivative income 533 1,464 394 1,412  Net gain (loss) on sale of assets 1,801 (62) 3,566 (55)  Safety deposit box income 413 429 891 915  Other miscellaneous 2,041 2,412 4,376 5,092  Total other noninterest income $ 11,556 $ 9,525 $ 20,902 $ 17,769 

Other Noninterest Expense (Tabl

Other Noninterest Expense (Tables)	6 Months Ended
	Jun. 30, 2016
Other Noninterest Expense [Abstract]
Components of Other Noninterest Expense	   Three Months Ended Six Months Ended   June 30, June 30,   (in thousands) 2016 2015 2016 2015  Advertising $ 2,693 $ 2,133 $ 5,050 $ 4,298  Ad valorem and franchise taxes 2,340 2,736 4,643 5,451  Printing and supplies 1,065 1,158 2,176 2,375  Insurance expense 829 928 1,664 1,850  Travel expense 1,079 1,308 2,028 2,527  Entertainment and contributions 2,001 1,736 3,633 3,375  Tax credit investment amortization 1,833 2,096 3,576 4,191  Other miscellaneous 4,633 10,211 10,412 13,045  Total other noninterest expense $ 16,473 $ 22,306 $ 33,182 $ 37,112 

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Computation of Earnings Per Common Share	   Three Months Ended Six Months Ended  June 30, June 30,  (in thousands, except per share data) 2016 2015 2016 2015  Numerator:  Net income to common shareholders $ 46,907 $ 34,829 $ 50,746 $ 74,988  Net income allocated to participating securities - basic and diluted 1,136 766 1,233 1,701  Net income allocated to common shareholders - basic and diluted $ 45,771 $ 34,063 $ 49,513 $ 73,287  Denominator:  Weighted-average common shares - basic $ 77,523 $ 77,951 $ 77,512 $ 78,719  Dilutive potential common shares 157 164 164 162  Weighted-average common shares - diluted $ 77,680 $ 78,115 $ 77,676 $ 78,881  Earnings per common share:  Basic $ 0.59 $ 0.44 $ 0.64 $ 0.93  Diluted $ 0.59 $ 0.44 $ 0.64 $ 0.93 

Retirement Plans (Tables)

Retirement Plans (Tables)	6 Months Ended
	Jun. 30, 2016
Retirement Plans [Abstract]
Components of Net Periodic Benefits Cost	   Other Post-  (in thousands) Pension Benefits retirement Benefits   Three Months Ended June 30, 2016 2016 2015 2016 2015  Service cost $ 3,611 $ 3,382 $ 45 $ 22  Interest cost 4,023 4,672 203 174  Expected return on plan assets (8,554) (8,206) — —  Amortization of net loss 1,426 842 53 (40)  Net periodic benefit cost $ 506 $ 690 $ 301 $ 156   Six Months Ended June 30, 2016  Service cost $ 6,876 $ 6,745 $ 74 $ 72  Interest cost 9,011 9,291 409 543  Expected return on plan assets (17,445) (16,419) — —  Amortization of net loss 2,894 1,486 22 85  Net periodic benefit cost $ 1,336 $ 1,103 $ 505 $ 700 

Share-Based Payment Arrangeme33

Share-Based Payment Arrangements (Tables)	6 Months Ended
	Jun. 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  Cancelled/Forfeited (60,377) 35.04  Expired (150,847) 46.06  Outstanding at June 30, 2016 534,582 $ 35.43 4.06 $ —  Exercisable at June 30, 2016 490,827 $ 35.92 3.92 $ — 
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 85,004 23.83  Vested (64,112) 31.15  Forfeited (185,249) 30.84  Nonvested at June 30, 2016 2,031,788 $ 30.64 

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2016
Fair Value [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	   June 30, 2016  (in thousands) Level 1 Level 2 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 116 $ 116  Municipal obligations — 156,292 156,292  Corporate debt securities — 3,500 3,500  Mortgage-backed securities — 1,906,346 1,906,346  Collateralized mortgage obligations — 241,346 241,346  Equity securities 1,212 — 1,212  Total available for sale securities 1,212 2,307,600 2,308,812  Derivative assets (1) — 43,903 43,903  Total recurring fair value measurements - assets $ 1,212 $ 2,351,503 $ 2,352,715  Liabilities  Derivative liabilities (1) $ — $ 43,184 $ 43,184  Total recurring fair value measurements - liabilities $ — $ 43,184 $ 43,184  (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  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	   June 30, 2016  (in thousands) Level 1 Level 2 Level 3 Total  Collateral-dependent impaired loans $ — $ 116,516 $ — $ 116,516  Other real estate owned — — 14,053 14,053  Total nonrecurring fair value measurements $ — $ 116,516 $ 14,053 $ 130,569      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	   June 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 $ 466,587 $ — $ — $ 466,587 $ 466,587  Available for sale securities 1,212 2,307,600 — 2,308,812 2,308,812  Held to maturity securities — 2,569,084 — 2,569,084 2,497,558  Loans, net — 116,516 16,058,354 16,174,870 15,809,710  Loans held for sale — 42,297 — 42,297 42,297  Derivative financial instruments — 43,903 — 43,903 43,903  Financial liabilities:  Deposits $ — $ — $ 18,837,146 $ 18,837,146 $ 18,816,869  Federal funds purchased 10,575 — — 10,575 10,575  Securities sold under agreements to repurchase 409,532 — — 409,532 409,532  FHLB borrowings 675,000 — — 675,000 675,000  Long-term debt — 474,888 — 474,888 468,028  Derivative financial instruments — 43,184 — 43,184 43,184      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	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Securities [Abstract]
Securities classified as trading	$ 0	$ 0		$ 0
Proceeds from sales of securities		102,335	$ 9,230
Realized gain	768	1,114	$ 333
Securities pledged as collateral	$ 3,400,000	$ 3,400,000		$ 3,500,000

Securities (Amortized Cost and

Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	$ 2,261,278	$ 2,086,745
Securities Available for Sale, Gross Unrealized Gains	47,664	20,120
Securities Available for Sale, Gross Unrealized Losses	130	13,461
Securities Available for Sale, Fair Value	2,308,812	2,093,404
US Treasury and Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	116	135
Securities Available for Sale, Gross Unrealized Losses		1
Securities Available for Sale, Fair Value	116	134
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	151,557	39,410
Securities Available for Sale, Gross Unrealized Gains	4,735	235
Securities Available for Sale, Gross Unrealized Losses		38
Securities Available for Sale, Fair Value	156,292	39,607
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	1,867,063	1,750,168
Securities Available for Sale, Gross Unrealized Gains	39,413	19,387
Securities Available for Sale, Gross Unrealized Losses	130	11,182
Securities Available for Sale, Fair Value	1,906,346	1,758,373
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	238,165	291,085
Securities Available for Sale, Gross Unrealized Gains	3,181	140
Securities Available for Sale, Gross Unrealized Losses		2,192
Securities Available for Sale, Fair Value	241,346	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	877	2,447
Securities Available for Sale, Gross Unrealized Gains	335	358
Securities Available for Sale, Gross Unrealized Losses		48
Securities Available for Sale, Fair Value	$ 1,212	$ 2,757

Securities (Amortized Cost an37

Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Total held to maturity securities, Amortized Cost	$ 2,497,558	$ 2,370,388
Securities Held to Maturity, Gross Unrealized Gains	72,816	21,304
Securities Held to Maturity, Gross Unrealized Losses	1,290	15,841
Securities Held to Maturity, Fair Value	2,569,084	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	1,047
Securities Held to Maturity, Gross Unrealized Losses		410
Securities Held to Maturity, Fair Value	51,047	49,590
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total held to maturity securities, Amortized Cost	496,999	185,890
Securities Held to Maturity, Gross Unrealized Gains	18,158	3,475
Securities Held to Maturity, Gross Unrealized Losses	372	1,166
Securities Held to Maturity, Fair Value	514,785	188,199
Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total held to maturity securities, Amortized Cost	946,722	1,014,135
Securities Held to Maturity, Gross Unrealized Gains	40,068	15,585
Securities Held to Maturity, Gross Unrealized Losses		1,589
Securities Held to Maturity, Fair Value	986,790	1,028,131
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total held to maturity securities, Amortized Cost	1,003,837	1,120,363
Securities Held to Maturity, Gross Unrealized Gains	13,543	2,244
Securities Held to Maturity, Gross Unrealized Losses	918	12,676
Securities Held to Maturity, Fair Value	$ 1,016,462	$ 1,109,931

Securities (Amortized Cost an38

Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Securities [Abstract]
Debt Securities Available for Sale, Due in one year or less, Amortized Cost	$ 6,825
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost	53,816
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost	391,388
Debt Securities Available for Sale, Due after ten years, Amortized Cost	1,808,372
Total available for sale debt securities, Amortized Cost	2,260,401
Debt Securities Available for Sale, Due in one year or less, Fair Value	6,839
Debt Securities Available for Sale, Due after one year through five years, Fair Value	54,914
Debt Securities Available for Sale, Due after five years through ten years, Fair Value	405,008
Debt Securities Available for Sale, Due after ten years, Fair Value	1,840,839
Total available for sale debt securities, Fair Value	2,307,600
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost	15,700
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost	136,327
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost	403,112
Debt Securities Held to Maturity, Due after ten years, Amortized Cost	1,942,419
Total held to maturity securities, Amortized Cost	2,497,558	$ 2,370,388
Debt Securities Held to Maturity, Due in one year or less, Fair Value	15,779
Debt Securities Held to Maturity, Due after one year through five years, Fair Value	140,424
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value	416,795
Debt Securities Held to Maturity, Due after ten years, Fair Value	1,996,086
Total held to maturity securities, Fair Value	$ 2,569,084	$ 2,375,851

Securities (Securities Availabl

Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	$ 13,310	$ 1,047,869
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	90	9,553
Available for Sale, Losses 12 months or longer, Fair Value	7,999	150,819
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	40	3,908
Available for Sale, Total, Fair Value	21,309	1,198,688
Available for Sale, Total, Gross Unrealized Losses	130	13,461
US Treasury and Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value
Available for Sale, Losses less than 12 months, Gross Unrealized Losses
Available for Sale, Losses 12 months or longer, Fair Value	70	82
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses		1
Available for Sale, Total, Fair Value	70	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		8,296
Available for Sale, Losses less than 12 months, Gross Unrealized Losses		38
Available for Sale, Total, Fair Value		8,296
Available for Sale, Total, Gross Unrealized Losses		38
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	13,310	831,156
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	90	8,257
Available for Sale, Losses 12 months or longer, Fair Value	7,929	116,126
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	40	2,925
Available for Sale, Total, Fair Value	21,239	947,282
Available for Sale, Total, Gross Unrealized Losses	$ 130	11,182
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value		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		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	Jun. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	$ 1,392	$ 934,207
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	2	5,194
Held to maturity, Losses 12 months or longer, Fair Value	162,076	419,483
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	1,288	10,647
Held to maturity, Total, Fair Value	163,468	1,353,690
Held to maturity, Total, Gross Unrealized Losses	1,290	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		22,652
Held to maturity, Losses less than 12 months, Gross Unrealized Losses		301
Held to maturity, Losses 12 months or longer, Fair Value	12,476	48,727
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	372	865
Held to maturity, Total, Fair Value	12,476	71,379
Held to maturity, Total, Gross Unrealized Losses	372	1,166
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	1,392	516,330
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	2	2,894
Held to maturity, Losses 12 months or longer, Fair Value	149,600	370,756
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	916	9,782
Held to maturity, Total, Fair Value	150,992	887,086
Held to maturity, Total, Gross Unrealized Losses	$ 918	$ 12,676

Loans and Allowance for Loan 41

Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)contractagreement	Jun. 30, 2015USD ($)contract	Dec. 31, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 265,722		$ 159,713
TDRs both accruing and nonaccruing	$ 70,800		13,100
Number of TDRs subsequently defaulted | contract	0	0
TDRs and loans impaired with minimum aggregate relationship balances	$ 1,000
Total loans	16,035,796	$ 14,344,752	15,703,314
Real estate acquired through foreclosure	$ 22,641		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	$ 34,800		8,800
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	$ 8,541		9,061
Total loans	2,064,368	$ 1,869,451	2,093,465
Real estate in process of foreclosure	7,100		7,400
Real estate acquired through foreclosure	5,900		9,300
Consumer [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,055,003		2,082,238
Consumer [Member] | FDIC Loss Share Agreement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate in process of foreclosure	3,600		4,100
Real estate acquired through foreclosure	$ 700		1,600
Non-Single Family [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 [Member] | FDIC Loss Share Agreement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 160,000		$ 170,100

Loans and Allowance for Loan 42

Loans and Allowance for Loan Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 16,035,796	$ 15,703,314	$ 14,344,752
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	11,953,778	11,560,325
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,017,650	2,049,524	1,955,837
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,064,368	2,093,465	1,869,451
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,024,471	1,553,082	1,452,091
Construction and Land Development [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	880,588	1,151,950	1,120,947
Total Commercial & Industrial [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,048,719	8,855,293	7,946,426
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	7,132,519	6,995,824	6,185,684
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,916,200	$ 1,859,469	$ 1,760,742

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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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	$ 17,196	$ 6,608	77,232	12,762
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			(3,437)	(2,536)
Allowance for loan losses: Ending balance	226,086	131,087	226,086	131,087
Allowance for loan losses: Individually evaluated for impairment	13,349	5,562	13,349	5,562
Allowance for loan losses: Amounts related to purchased credit impaired loans	19,590	24,062	19,590	24,062
Allowance for loan losses: Collectively evaluated for impairment	193,147	101,463	193,147	101,463
Loans: Individually evaluated for impairment	248,967	72,607	248,967	72,607
Loans: Purchased credit impaired loans	209,924	259,437	209,924	259,437	$ 225,838	$ 313,685
Loans: Collectively evaluated for impairment	15,576,905	14,012,708	15,576,905	14,012,708
Loans: Total loans	16,035,796	14,344,752	16,035,796	14,344,752	15,703,314
Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Total loans	11,953,778		11,953,778		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	12,799	5,500	12,799	5,500
Allowance for loan losses: Individually evaluated for impairment	72	228	72	228
Allowance for loan losses: Amounts related to purchased credit impaired loans	741	973	741	973
Allowance for loan losses: Collectively evaluated for impairment	11,986	4,299	11,986	4,299
Loans: Individually evaluated for impairment	7,803	12,682	7,803	12,682
Loans: Purchased credit impaired loans	10,752	15,563	10,752	15,563
Loans: Collectively evaluated for impairment	2,005,916	1,423,846	2,005,916	1,423,846
Loans: Total loans	2,024,471	1,452,091	2,024,471	1,452,091	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	5,006	5,301	5,006	5,301
Allowance for loan losses: Individually evaluated for impairment	1	73	1	73
Allowance for loan losses: Amounts related to purchased credit impaired loans	575	390	575	390
Allowance for loan losses: Collectively evaluated for impairment	4,430	4,838	4,430	4,838
Loans: Individually evaluated for impairment	1,247	4,360	1,247	4,360
Loans: Purchased credit impaired loans	8,761	19,465	8,761	19,465
Loans: Collectively evaluated for impairment	870,580	1,097,122	870,580	1,097,122
Loans: Total loans	880,588	1,120,947	880,588	1,120,947	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	23,474	24,689	23,474	24,689
Allowance for loan losses: Individually evaluated for impairment	167	163	167	163
Allowance for loan losses: Amounts related to purchased credit impaired loans	15,430	17,419	15,430	17,419
Allowance for loan losses: Collectively evaluated for impairment	7,877	7,107	7,877	7,107
Loans: Individually evaluated for impairment	1,068	1,369	1,068	1,369
Loans: Purchased credit impaired loans	151,674	171,107	151,674	171,107
Loans: Collectively evaluated for impairment	1,864,908	1,783,361	1,864,908	1,783,361
Loans: Total loans	2,017,650	1,955,837	2,017,650	1,955,837	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	23,359	20,286	23,359	20,286
Allowance for loan losses: Individually evaluated for impairment	41	6	41	6
Allowance for loan losses: Amounts related to purchased credit impaired loans	1,257	2,998	1,257	2,998
Allowance for loan losses: Collectively evaluated for impairment	22,061	17,282	22,061	17,282
Loans: Individually evaluated for impairment	166	116	166	116
Loans: Purchased credit impaired loans	12,826	14,860	12,826	14,860
Loans: Collectively evaluated for impairment	2,051,376	1,854,475	2,051,376	1,854,475
Loans: Total loans	2,064,368	1,869,451	2,064,368	1,869,451	2,093,465
Purchased Credit Impaired [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(78)	(4,060)
Allowance for loan losses: Recoveries			292	1,023
Allowance for loan losses: Net provision for loan losses			(307)	(949)
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			(3,437)	(2,536)
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
Allowance for loan losses: Net provision for loan losses			26	1,102
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)	(285)
Allowance for loan losses: Recoveries			53	406
Allowance for loan losses: Net provision for loan losses			(117)	(733)
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			(23)	(168)
Allowance for loan losses: Recoveries			3	2
Allowance for loan losses: Net provision for loan losses			1,165	272
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			(3,378)	(3,296)
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			106	136
Allowance for loan losses: Net provision for loan losses			(1,290)	(889)
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			(98)	(104)
Non-Purchased Credit Impaired [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(36,054)	(11,589)
Allowance for loan losses: Recoveries			6,952	6,725
Allowance for loan losses: Net provision for loan losses			77,539	13,711
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)	(147)
Allowance for loan losses: Recoveries			268	291
Allowance for loan losses: Net provision for loan losses			6,654	(1,858)
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			(592)	(828)
Allowance for loan losses: Recoveries			1,125	1,308
Allowance for loan losses: Net provision for loan losses			(1,087)	(982)
Non-Purchased Credit Impaired [Member] | Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(592)	(1,292)
Allowance for loan losses: Recoveries			480	449
Allowance for loan losses: Net provision for loan losses			466	62
Non-Purchased Credit Impaired [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(11,268)	(6,729)
Allowance for loan losses: Recoveries			3,039	2,491
Allowance for loan losses: Net provision for loan losses			8,021	4,091
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	161,448	75,311	161,448	75,311
Allowance for loan losses: Individually evaluated for impairment	13,068	5,092	13,068	5,092
Allowance for loan losses: Amounts related to purchased credit impaired loans	1,587	2,282	1,587	2,282
Allowance for loan losses: Collectively evaluated for impairment	146,793	67,937	146,793	67,937
Loans: Individually evaluated for impairment	238,683	54,080	238,683	54,080
Loans: Purchased credit impaired loans	25,911	38,442	25,911	38,442
Loans: Collectively evaluated for impairment	8,784,125	7,853,904	8,784,125	7,853,904
Loans: Total loans	9,048,719	7,946,426	9,048,719	7,946,426	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	150,772	60,323	150,772	60,323
Allowance for loan losses: Individually evaluated for impairment	12,885	2,903	12,885	2,903
Allowance for loan losses: Amounts related to purchased credit impaired loans	572	643	572	643
Allowance for loan losses: Collectively evaluated for impairment	137,315	56,777	137,315	56,777
Loans: Individually evaluated for impairment	232,785	32,379	232,785	32,379
Loans: Purchased credit impaired loans	10,483	13,667	10,483	13,667
Loans: Collectively evaluated for impairment	6,889,251	6,139,638	6,889,251	6,139,638
Loans: Total loans	7,132,519	6,185,684	7,132,519	6,185,684	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	10,676	14,988	10,676	14,988
Allowance for loan losses: Individually evaluated for impairment	183	2,189	183	2,189
Allowance for loan losses: Amounts related to purchased credit impaired loans	1,015	1,639	1,015	1,639
Allowance for loan losses: Collectively evaluated for impairment	9,478	11,160	9,478	11,160
Loans: Individually evaluated for impairment	5,898	21,701	5,898	21,701
Loans: Purchased credit impaired loans	15,428	24,775	15,428	24,775
Loans: Collectively evaluated for impairment	1,894,874	1,714,266	1,894,874	1,714,266
Loans: Total loans	$ 1,916,200	$ 1,760,742	1,916,200	1,760,742	$ 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)	(1,114)
Allowance for loan losses: Recoveries			128	479
Allowance for loan losses: Net provision for loan losses			(91)	(701)
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			39	(49)
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				(1,099)
Allowance for loan losses: Recoveries			8	14
Allowance for loan losses: Net provision for loan losses			79	470
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable			39	347
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)	(15)
Allowance for loan losses: Recoveries			120	465
Allowance for loan losses: Net provision for loan losses			(170)	(1,171)
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			(23,411)	(2,593)
Allowance for loan losses: Recoveries			2,040	2,186
Allowance for loan losses: Net provision for loan losses			63,485	12,398
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			(22,212)	(2,215)
Allowance for loan losses: Recoveries			1,802	2,051
Allowance for loan losses: Net provision for loan losses			61,628	9,586
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			(1,199)	(378)
Allowance for loan losses: Recoveries			238	135
Allowance for loan losses: Net provision for loan losses			$ 1,857	$ 2,812

Loans and Allowance for Loan 44

Loans and Allowance for Loan Losses (Composition of Nonaccrual Loans by Portfolio Class) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 265,722	$ 159,713
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	9,011	10,815
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	4,173	17,294
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	22,874	23,799
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	8,541	9,061
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	221,123	98,744
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	209,362	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	$ 11,761	$ 10,001

Loans and Allowance for Loan 45

Loans and Allowance for Loan Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	21	4
Pre-Modification Outstanding Recorded Investment	$ 58,347	$ 570
Post-Modification Outstanding Recorded Investment	$ 58,347	$ 570
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	4	2
Pre-Modification Outstanding Recorded Investment	$ 432	$ 68
Post-Modification Outstanding Recorded Investment	$ 432	$ 68
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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	$ 111,297		$ 111,297		$ 55,034
Recorded investment with an allowance	137,670		137,670		58,392
Unpaid principal balance	263,211		263,211		118,623
Related allowance	13,349		13,349		20,988
Average recorded investment	239,856	$ 56,945	205,971	$ 47,865
Interest income recognized	532	74	925	149
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	5,265		5,265		3,038
Recorded investment with an allowance	2,538		2,538		8,085
Unpaid principal balance	8,034		8,034		11,363
Related allowance	72		72		1,382
Average recorded investment	8,242	12,521	9,072	10,366
Interest income recognized	22	26	43	41
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	19		19		1,765
Unpaid principal balance	2,089		2,089		14,784
Related allowance	1		1		392
Average recorded investment	7,660	4,371	10,905	5,664
Interest income recognized		27		59
Residential Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment with an allowance	1,068		1,068		895
Unpaid principal balance	1,709		1,709		1,405
Related allowance	167		167		127
Average recorded investment	976	1,896	932	2,149
Interest income recognized	2	7	4	20
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment with an allowance	166		166		152
Unpaid principal balance	166		166		152
Related allowance	41		41		33
Average recorded investment	112	119	109	81
Interest income recognized	1	1	2	3
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	104,804		104,804		39,535
Recorded investment with an allowance	133,879		133,879		47,495
Unpaid principal balance	251,213		251,213		90,919
Related allowance	13,068		13,068		19,054
Average recorded investment	222,866	38,038	184,953	29,605
Interest income recognized	507	13	876	26
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	101,481		101,481		34,788
Recorded investment with an allowance	131,304		131,304		46,834
Unpaid principal balance	244,928		244,928		84,988
Related allowance	12,885		12,885		19,031
Average recorded investment	216,907	23,473	179,117	16,977
Interest income recognized	493	1	847	3
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	3,323		3,323		4,747
Recorded investment with an allowance	2,575		2,575		661
Unpaid principal balance	6,285		6,285		5,931
Related allowance	183		183		$ 23
Average recorded investment	5,959	14,565	5,836	12,628
Interest income recognized	$ 14	$ 12	$ 29	$ 23

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	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 190,482	$ 153,691
Current	15,845,314	15,549,623
Total loans	16,035,796	15,703,314	$ 14,344,752
Recorded investment > 90 days and still accruing	7,982	7,653
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	81,399	79,027
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	43,854	12,101
Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	65,229	62,563
Total Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	11,953,778	11,560,325
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	5,827	7,856
Current	2,018,644	1,545,226
Total loans	2,024,471	1,553,082	1,452,091
Recorded investment > 90 days and still accruing	194	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	2,583	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	467	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	2,777	6,382
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	9,971	24,365
Current	870,617	1,127,585
Total loans	880,588	1,151,950	1,120,947
Recorded investment > 90 days and still accruing	4,759	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	1,386	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	938	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	7,647	4,043
Total Commercial [Member] | Total Commercial & Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	117,156	57,227
Current	8,931,563	8,798,066
Total loans	9,048,719	8,855,293	7,946,426
Recorded investment > 90 days and still accruing	2,062	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	50,310	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	30,697	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	36,149	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	105,450	43,881
Current	7,027,069	6,951,943
Total loans	7,132,519	6,995,824	6,185,684
Recorded investment > 90 days and still accruing	567	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	47,859	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	28,591	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	29,000	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	11,706	13,346
Current	1,904,494	1,846,123
Total loans	1,916,200	1,859,469	1,760,742
Recorded investment > 90 days and still accruing	1,495	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	2,451	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	2,106	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	7,149	6,646
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	34,950	34,857
Current	1,982,700	2,014,667
Total loans	2,017,650	2,049,524	1,955,837
Recorded investment > 90 days and still accruing	143	163
Residential Mortgages [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	15,108	18,657
Residential Mortgages [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7,293	4,360
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	12,549	11,840
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	22,578	29,386
Current	2,041,790	2,064,079
Total loans	2,064,368	2,093,465	$ 1,869,451
Recorded investment > 90 days and still accruing	824	2,166
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	12,012	16,309
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,459	4,432
Consumer [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 6,107	$ 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	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 16,035,796	$ 15,703,314	$ 14,344,752
Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,953,778	11,560,325
Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,520,748	10,577,368
Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	324,310	221,911
Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	296,326	270,579
Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	810,268	490,407
Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,126	60
Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,017,650	2,049,524	1,955,837
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,064,368	2,093,465	1,869,451
Residential Mortgages and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,082,018	4,142,989
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,024,471	1,553,082	1,452,091
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,961,653	1,502,484
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	15,764	14,717
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,412	5,905
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	38,629	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	880,588	1,151,950	1,120,947
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	847,229	1,095,296
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,355	6,841
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	537	12,297
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,467	37,516
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,048,719	8,855,293	7,946,426
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,711,866	7,979,588
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	292,191	200,353
Total Commercial & Industrial [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	287,377	252,377
Total Commercial & Industrial [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	755,172	422,931
Total Commercial & Industrial [Member] | Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,113	44
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,132,519	6,995,824	6,185,684
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,968,194	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	252,605	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	250,226	211,230
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	659,381	355,098
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,113	44
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,916,200	1,859,469	$ 1,760,742
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,743,672	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	39,586	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	37,151	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	95,791	67,833
Performing [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,994,633	2,025,563
Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,055,003	2,082,238
Performing [Member] | Residential Mortgages and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,049,636	4,107,801
Nonperforming [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	23,017	23,961
Nonperforming [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,365	11,227
Nonperforming [Member] | Residential Mortgages and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 32,382	$ 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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Loans and Allowance for Loan Losses [Abstract]
Beginning balance			$ 29,868	$ 60,272
Amortization	$ (1,526)	$ (1,273)	(3,139)	(2,470)
Charge-offs, write-downs and other recoveries			(2,683)	(4,667)
External expenses qualifying under loss share agreement			307	482
Changes due to changes in cash flow projections			(3,437)	(2,536)
FDIC resolution of denied claims				(1,854)
Net payments to (from) FDIC			159	(14,153)
Ending balance	$ 21,075	$ 35,074	$ 21,075	$ 35,074

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	6 Months Ended	12 Months Ended
	Jun. 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	(26,541)	(115,847)
Carrying Amount of Loans, Accretion	10,627	28,000
Carrying Amount of Loans, Balance at end of period	209,924	225,838
Accretable Yield, Balance at beginning of period	129,488	187,456
Accretable Yield, Payments received, net	(6,581)	(21,978)
Accretable Yield, Accretion	(10,627)	(28,000)
Accretable Yield, Increase (decrease) in expected cash flows based on actual cash flows and changes in cash flow assumptions	5,107	(4,238)
Accretable Yield, Net transfers to (from) nonaccretable difference to accretable yield	8,997	(3,752)
Accretable Yield, Balance at end of period	$ 126,384	$ 129,488

Securities Sold under Agreeme51

Securities Sold under Agreements to Repurchase (Details) $ in Millions	Jun. 30, 2016USD ($)
Securities Sold under Agreements to Repurchase [Abstract]
Securities sold under agreements to repurchase	$ 409.5

Long-Term Debt (Long-Term Debt)

Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Gross long-term debt	$ 473,785
Less unamortized debt issuance costs	(5,757)	$ (5,854)
Total long-term debt less unamortized debt issuance costs	468,028	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	$ (5,044)
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	$ 116,050	125,000
Less unamortized debt issuance costs	$ (713)
Notes payable maturity date	Dec. 18, 2018
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 112,224	$ 122,988

Long-Term Debt (Long-Term Debt

Long-Term Debt (Long-Term Debt with Related Unamortized Debt Issuance Cost) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal	$ 473,785
Unamortized Debt Issuance Costs	5,757	$ 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	$ 5,044
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	$ 116,050	125,000
Unamortized Debt Issuance Costs	$ 713
Notes payable maturity date	Dec. 18, 2018
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Principal	$ 112,224	$ 122,988

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)agreement	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Derivative [Line Items]
Ineffective portion of change in derivative fair value	$ 0
Derivative income reflected in income statement	400	$ 1,400
Impact to interest income from cash flow hedges	1,000	$ 800
Aggregate fair value of derivatives in a net liability position	(40,700)
Collateral obligations for derivative counterparties	40,200
Derivatives Designated as Hedging Instruments [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 800,000		$ 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	5
Notional amount of derivatives	$ 800,000		$ 500,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | $300 Million Swap Agreement [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 [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 [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 [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 Two [Member] | $100 Million Swap Agreement [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 Three [Member] | $100 Million Swap Agreement [Member]
Derivative [Line Items]
Swap agreement expiration date	Apr. 1, 2020

Derivatives (Fair Values of Der

Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	$ 43,903	$ 23,251
Fair Values, Liabilities	[1]	43,184	23,968
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		800,000	500,000
Fair Values, Assets	[2]	3,330
Fair Values, Liabilities	[2]		281
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		1,148,279	1,002,350
Fair Values, Assets	[2]	40,573	23,251
Fair Values, Liabilities	[2]	43,184	23,687
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts	[3]	856,332	780,871
Fair Values, Assets	[2],[3]	38,389	20,622
Fair Values, Liabilities	[2],[3]	40,202	21,007
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		88,946	83,430
Fair Values, Assets	[2]	114	83
Fair Values, Liabilities	[2]	243	162
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		105,357	55,128
Fair Values, Assets	[2]	23	263
Fair Values, Liabilities	[2]	1,404	336
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		62,622	38,853
Fair Values, Assets	[2]	703	243
Fair Values, Liabilities	[2]	12	167
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		35,022	44,068
Fair Values, Assets	[2]	1,344	2,040
Fair Values, Liabilities	[2]	1,323	2,015
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amounts		800,000	500,000
Fair Values, Assets	[2]	$ 3,330
Fair Values, Liabilities	[2]		$ 281
[1]	For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.
[2]	Derivative assets and liabilities are reported with other assets or other liabilities, respectively, in the consolidated balance sheets.
[3]	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	Jun. 30, 2016	Dec. 31, 2015
Derivatives [Abstract]
Gross Amounts Recognized, Derivative Assets	$ 3,579	$ 224
Gross Amounts Offset in the Statement of Financial Position, Derivative Assets
Net Amounts Presented in the Statement of Financial Position, Derivative Assets	3,579	224
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments, Derivative Assets	3,579	224
Gross Amounts Not offset in the Statement of Financial Position -Cash Collateral, Derivative Assets
Net Amount, Derivative Assets
Gross Amounts Recognized, Derivative Liabilities	40,699	21,034
Gross Amounts Offset in the Statement of Financial Position, Derivative Liabilities
Net Amounts Presented in the Statement of Financial Position, Derivative Liabilities	40,699	21,034
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments, Derivative Liabilities	3,579	224
Gross Amounts Not offset in the Statement of Financial Position -Cash Collateral, Derivative Liabilities	40,202	23,482
Net Amount, Derivative Liabilities	$ (3,082)	$ (2,672)

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - $ / shares	Aug. 28, 2015	Jun. 30, 2016	Jun. 30, 2016
Shares authorized for repurchase	5.00%
Number of shares authorized for repurchase	3,900,000
Expiration date		Sep. 30, 2016
Treasury Stock [Member]
Repurchased common stock shares			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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (80,595)	$ (50,074)
Net change in unrealized (loss) gain	$ 16,629	$ (18,370)	45,601	(12,957)
Reclassification of net (gain) losses realized and included in earnings	711	801	1,802	1,406
Valuation adjustment for employee benefit plans		(5,922)		(5,922)
Amortization of unrealized net loss on securities transferred to HTM	830	939	1,628	1,586
Income tax (benefit) expense	6,645	(8,237)	17,977	(5,877)
Ending Balance	(49,541)	(60,084)	(49,541)	(60,084)
Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			4,268	18,001
Net change in unrealized (loss) gain			41,990	(13,962)
Reclassification of net (gain) losses realized and included in earnings			(1,114)	(165)
Valuation adjustment for employee benefit plans
Amortization of unrealized net loss on securities transferred to HTM
Income tax (benefit) expense			14,970	(5,249)
Ending Balance	30,174	9,123	30,174	9,123
HTM Securities Transferred from AFS [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(16,795)	(19,074)
Net change in unrealized (loss) 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			1,628	1,586
Income tax (benefit) expense			625	580
Ending Balance	(15,792)	(18,068)	(15,792)	(18,068)
Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(67,890)	(48,626)
Net change in unrealized (loss) gain
Reclassification of net (gain) losses realized and included in earnings			2,916	1,571
Valuation adjustment for employee benefit plans				(5,922)
Amortization of unrealized net loss on securities transferred to HTM
Income tax (benefit) expense			1,066	(1,574)
Ending Balance	(66,040)	(51,403)	(66,040)	(51,403)
Loss on Effective Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(178)	(375)
Net change in unrealized (loss) gain			3,611	1,005
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			1,316	366
Ending Balance	$ 2,117	$ 264	$ 2,117	$ 264

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		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items		$ (14,004)	$ (12,870)	$ (29,718)	$ (28,504)
Tax effect		(13,618)	(12,311)	(14,733)	(27,187)
Net income		$ 46,907	$ 34,829	50,746	74,988
Amount Reclassified from Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	[1]			(2,129)	(1,920)
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]			1,114	165
Tax effect	[1]			(390)	(58)
Net income	[1]			724	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]			(1,628)	(1,586)
Tax effect	[1]			625	580
Net income	[1]			(1,003)	(1,006)
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]			(2,916)	(1,571)
Tax effect	[1]			1,066	550
Net income	[1]			$ (1,850)	$ (1,021)
[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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Noninterest Income [Abstract]
Income from bank-owned life insurance	$ 4,501	$ 2,671	$ 7,051	$ 5,337
Credit related fees	2,267	2,611	4,624	5,068
Derivative income	533	1,464	394	1,412
Net gain (loss) on sale of assets	1,801	(62)	3,566	(55)
Safety deposit box income	413	429	891	915
Other miscellaneous	2,041	2,412	4,376	5,092
Total other noninterest income	$ 11,556	$ 9,525	$ 20,902	$ 17,769

Other Noninterest Expense (Deta

Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Noninterest Expense [Abstract]
Advertising	$ 2,693	$ 2,133	$ 5,050	$ 4,298
Ad valorem and franchise taxes	2,340	2,736	4,643	5,451
Printing and supplies	1,065	1,158	2,176	2,375
Insurance expense	829	928	1,664	1,850
Travel expense	1,079	1,308	2,028	2,527
Entertainment and contributions	2,001	1,736	3,633	3,375
Tax credit investment amortization	1,833	2,096	3,576	4,191
Other miscellaneous	4,633	10,211	10,412	13,045
Total other noninterest expense	$ 16,473	$ 22,306	$ 33,182	$ 37,112

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income to common shareholders	$ 46,907	$ 34,829	$ 50,746	$ 74,988
Net income allocated to participating securities - basic and diluted	1,136	766	1,233	1,701
Net income allocated to common shareholders - basic and diluted	$ 45,771	$ 34,063	$ 49,513	$ 73,287
Weighted-average common shares - basic	77,523,000	77,951,000	77,512,000	78,719,000
Dilutive potential common shares	157,000	164,000	164,000	162,000
Weighted-average common shares - diluted	77,680,000	78,115,000	77,676,000	78,881,000
Earnings per common share: Basic	$ 0.59	$ 0.44	$ 0.64	$ 0.93
Earnings per common share: Diluted	$ 0.59	$ 0.44	$ 0.64	$ 0.93
Weighted-average anti-dilutive potential common shares	548,821	574,037	602,809	843,544

Retirement Plans (Narrative) (D

Retirement Plans (Narrative) (Details)	6 Months Ended
	Jun. 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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3,611	$ 3,382	$ 6,876	$ 6,745
Interest cost	4,023	4,672	9,011	9,291
Expected return on plan assets	(8,554)	(8,206)	(17,445)	(16,419)
Amortization of net loss	1,426	842	2,894	1,486
Net periodic benefit cost	506	690	1,336	1,103
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	45	22	74	72
Interest cost	203	174	409	543
Amortization of net loss	53	(40)	22	85
Net periodic benefit cost	$ 301	$ 156	$ 505	$ 700

Share-Based Payment Arrangeme65

Share-Based Payment Arrangements (Narrative) (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2016USD ($)entity$ / sharesshares	Jun. 30, 2015USD ($)
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised | $	$ 0	$ 0.2
Restricted and Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense | $	$ 37
Weighted-average period	3 years 2 months 12 days
Total fair value of shares vested | $	$ 2	$ 7.5
Shares granted | shares	85,004
Grant date fair value per share | $ / shares	$ 23.83
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]	6 Months Ended
	Jun. 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, Cancelled/Forfeited | shares	(60,377)
Number of Shares, Expired | shares	(150,847)
Number of Shares, Outstanding at Ending | shares	534,582
Number of Shares, Exercisable at Ending | shares	490,827
Weighted Average Exercise Price, Outstanding at Beginning | $ / shares	$ 37.55
Weighted Average Exercise Price, Cancelled/Forfeited | $ / shares	35.04
Weighted Average Exercise Price, Expired | $ / shares	46.06
Weighted Average Exercise Price, Outstanding at Ending | $ / shares	35.43
Weighted Average Exercise Price, Exercisable at Ending | $ / shares	$ 35.92
Weighted Average Remaining Contractual Term (Years), Outstanding at Ending	4 years 22 days
Weighted Average Remaining Contractual Term (Years), Exercisable at Ending	3 years 11 months 1 day
Aggregate Intrinsic Value, Outstanding at Ending | $
Aggregate Intrinsic Value, Exercisable at Ending | $

Share-Based Payment Arrangeme67

Share-Based Payment Arrangements (Summary of Nonvested Restricted and Performance Shares) (Details) - Restricted and Performance Shares [Member]	6 Months Ended
	Jun. 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	85,004
Number of Shares, Vested | shares	(64,112)
Number of Shares, Forfeited | shares	(185,249)
Number of Shares, Nonvested at Ending | shares	2,031,788
Weighted Average Grant Date Fair Value, Nonvested at Beginning | $ / shares	$ 30.97
Weighted Average Grant Date Fair Value, Granted | $ / shares	23.83
Weighted Average Grant Date Fair Value, Vested | $ / shares	31.15
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	30.84
Weighted Average Grant Date Fair Value, Nonvested at Ending | $ / shares	$ 30.64

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - Investment Securities [Member] - Recurring [Member]	6 Months Ended
	Jun. 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		Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		$ 2,308,812	$ 2,093,404
Derivative assets	[1]	43,903	23,251
Total recurring fair value measurements - assets		2,352,715	2,116,655
Derivative liabilities	[1]	43,184	23,968
Total recurring fair value measurements - liabilities		43,184	23,968
US Treasury and Government Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		116	134
Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		156,292	39,607
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
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		1,906,346	1,758,373
Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		241,346	289,033
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		1,212	2,757
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		1,212	2,757
Total recurring fair value measurements - assets		1,212	2,757
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		2,307,600	2,090,647
Derivative assets	[1]	43,903	23,251
Total recurring fair value measurements - assets		2,351,503	2,113,898
Derivative liabilities	[1]	43,184	23,968
Total recurring fair value measurements - liabilities		43,184	23,968
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		116	134
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		156,292	39,607
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] | Mortgage-Backed Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities		1,906,346	1,758,373
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		241,346	289,033
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		$ 1,212	$ 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	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	$ 116,516	$ 93,602
Other real estate owned	14,053	17,206
Total nonrecurring fair value measurements	130,569	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	116,516	93,602
Total nonrecurring fair value measurements	116,516	93,602
Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	14,053	17,206
Total nonrecurring fair value measurements	$ 14,053	$ 17,206

Fair Value (Estimated Fair Valu

Fair Value (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities		$ 2,308,812	$ 2,093,404
Held to maturity securities		2,497,558	2,370,388
Derivative financial instruments	[1]	43,903	23,251
Derivative financial instruments	[1]	43,184	23,968
Total Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold		466,587	869,429
Available for sale securities		2,308,812	2,093,404
Held to maturity securities		2,569,084	2,375,851
Loans, net		16,174,870	15,427,803
Loans held for sale		42,297	20,434
Derivative financial instruments		43,903	23,251
Deposits		18,837,146	18,327,425
Federal funds purchased		10,575	10,100
Securities sold under agreements to repurchase		409,532	513,544
FHLB borrowings		675,000	900,000
Long-term debt		474,888	488,711
Derivative financial instruments		43,184	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		466,587	869,429
Available for sale securities		1,212	2,757
Federal funds purchased		10,575	10,100
Securities sold under agreements to repurchase		409,532	513,544
FHLB borrowings		675,000	900,000
Total Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities		2,307,600	2,090,647
Held to maturity securities		2,569,084	2,375,851
Loans, net		116,516	93,602
Loans held for sale		42,297	20,434
Derivative financial instruments		43,903	23,251
Long-term debt		474,888	488,711
Derivative financial instruments		43,184	23,968
Total Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net		16,058,354	15,334,201
Deposits		18,837,146	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		466,587	869,429
Available for sale securities		2,308,812	2,093,404
Held to maturity securities		2,497,558	2,370,388
Loans, net		15,809,710	15,522,135
Loans held for sale		42,297	20,434
Derivative financial instruments		43,903	23,251
Deposits		18,816,869	18,348,912
Federal funds purchased		10,575	10,100
Securities sold under agreements to repurchase		409,532	513,544
FHLB borrowings		675,000	900,000
Long-term debt		468,028	490,145
Derivative financial instruments		$ 43,184	$ 23,968
[1]	For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.