Hancock Whitney Corporation - 6 (HWC) 10-Q 4 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Aug. 01, 2017
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, 2017
Document Fiscal Year Focus	2,017
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		84,742,940

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Cash and due from banks	$ 365,225	$ 372,689
Interest-bearing bank deposits	125,577	77,235
Federal funds sold	851	942
Securities available for sale, at fair value (amortized cost of $2,824,787 and $2,562,000)	2,794,382	2,516,908
Securities held to maturity (fair value of $2,866,529 and $2,470,117)	2,874,454	2,500,220
Loans held for sale	26,787	34,064
Loans	18,473,841	16,752,151
Less: allowance for loan losses	(221,865)	(229,418)
Loans, net	18,251,976	16,522,733
Property and equipment, net of accumulated depreciation of $237,304 and $231,127	365,345	361,612
Prepaid expenses	24,985	18,038
Other real estate, net	17,996	18,884
Accrued interest receivable	75,787	65,887
Goodwill	740,265	621,193
Other intangible assets, net	101,694	87,757
Life insurance contracts	536,912	480,406
FDIC loss share receivable	3,234	16,219
Deferred tax asset, net	89,882	104,435
Other assets	235,217	176,080
Total assets	26,630,569	23,975,302
Deposits:
Noninterest-bearing	7,887,867	7,658,203
Interest-bearing	13,554,948	11,766,063
Total deposits	21,442,815	19,424,266
Short-term borrowings	1,810,907	1,225,406
Long-term debt	407,876	436,280
Accrued interest payable	8,024	9,574
Other liabilities	146,985	160,008
Total liabilities	23,816,607	21,255,534
Stockholders' equity:
Common Stock	291,358	291,358
Capital surplus	1,716,584	1,698,253
Retained earnings	910,459	850,689
Accumulated other comprehensive loss, net	(104,439)	(120,532)
Total stockholders' equity	2,813,962	2,719,768
Total liabilities and stockholders' equity	$ 26,630,569	$ 23,975,302
Common shares authorized (par value of 3.33 per share)	350,000	350,000
Common shares issued	87,495	87,495
Common shares outstanding	84,738	84,235

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Consolidated Balance Sheets [Abstract]
Securities available for sale, amortized cost	$ 2,824,787	$ 2,562,000
Securities held to maturity, fair value	2,866,529	2,470,117
Property and equipment, accumulated depreciation	$ 237,304	$ 231,127
Common stock, par value per share	$ 3.33	$ 3.33

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income:
Loans, including fees	$ 194,180	$ 156,717	$ 366,961	$ 310,830
Loans held for sale	236	249	453	408
Securities-taxable	24,402	23,049	47,769	47,006
Securities-tax exempt	5,628	3,011	11,035	4,813
Short-term investments	1,731	480	2,474	1,090
Total interest income	226,177	183,506	428,692	364,147
Interest expense:
Deposits	18,364	12,603	31,183	24,336
Short-term borrowings	4,232	909	7,173	1,902
Long-term debt	3,864	5,025	8,928	10,104
Total interest expense	26,460	18,537	47,284	36,342
Net interest income	199,717	164,969	381,408	327,805
Provision for loan losses	14,951	17,196	30,942	77,232
Net interest income after provision for loan losses	184,766	147,773	350,466	250,573
Noninterest income:
Service charges on deposit accounts	20,061	18,394	39,267	36,777
Trust fees	11,506	12,089	22,717	23,313
Bank card and ATM fees	13,687	11,954	26,155	23,302
Investment and annuity fees	5,271	5,043	9,870	9,976
Secondary mortgage market operations	4,241	4,176	7,808	7,088
Insurance commissions and fees	1,174	1,240	1,839	2,547
Amortization of FDIC loss share receivable	(1,327)	(1,526)	(2,427)	(3,139)
Other income	12,874	11,556	25,749	20,902
Securities transactions		768		1,114
Total noninterest income	67,487	63,694	130,978	121,880
Noninterest expense:
Compensation expense	82,145	70,233	155,244	143,234
Employee benefits	15,500	14,004	31,520	29,718
Personnel expense	97,645	84,237	186,764	172,952
Net occupancy expense	13,080	10,394	23,837	20,750
Equipment expense	3,964	3,080	7,678	6,854
Data processing expense	16,798	14,370	32,195	28,577
Professional services expense	10,353	7,712	21,629	15,333
Amortization of intangibles	5,757	5,005	10,462	10,129
Telecommunications and postage	3,738	3,272	7,205	6,633
Deposit insurance and regulatory fees	6,983	6,049	13,473	11,446
Other real estate (income) expense, net	(2,515)	350	(2,528)	1,118
Other expense	27,667	16,473	46,297	33,182
Total noninterest expense	183,470	150,942	347,012	306,974
Income before income taxes	68,783	60,525	134,432	65,479
Income taxes	16,516	13,618	33,151	14,733
Net income	$ 52,267	$ 46,907	$ 101,281	$ 50,746
Earnings per common share-basic	$ 0.60	$ 0.59	$ 1.17	$ 0.64
Earnings per common share-diluted	0.60	0.59	1.17	0.64
Dividends paid per share	$ 0.24	$ 0.24	$ 0.48	$ 0.48
Weighted average shares outstanding-basic	84,614	77,523	84,489	77,512
Weighted average shares outstanding-diluted	84,867	77,680	84,755	77,676

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 52,267	$ 46,907	$ 101,281		$ 50,746
Other comprehensive income:
Net change in unrealized gain on securities available for sale and hedges	12,661	16,629	13,845		45,601
Reclassification of net losses realized and included in earnings	1,718	711	3,105		1,802
Valuation adjustment for pension plan amendment	17,315		17,315	[1]
Other valuation adjustments for employee benefit plan	(10,782)		(10,782)
Amortization of unrealized net loss on securities transferred to HTM	1,099	830	1,749		1,628
Other comprehensive income before income taxes	22,011	18,170	25,232		49,031
Income tax expense	7,938	6,645	9,139		17,977
Other comprehensive income net of income taxes	14,073	11,525	16,093		31,054
Comprehensive income	$ 66,340	$ 58,432	$ 117,374		$ 81,800
[1]	For further discussion on the pension plan amendment, see Note 11 - Retirement Plans.

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]	Total
Balance at Dec. 31, 2015	$ 291,346	$ 1,424,448	$ 777,944	$ (80,595)	$ 2,413,143
Balance, Shares issued at Dec. 31, 2015	87,491
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		6,624			6,624
Issuance of stock from dividend reinvestment and stock purchase plan		36			36
Balance at Jun. 30, 2016	$ 291,346	1,431,108	790,452	(49,541)	2,463,365
Balance, Shares Issued at Jun. 30, 2016	87,491
Balance at Dec. 31, 2016	$ 291,358	1,698,253	850,689	(120,532)	$ 2,719,768
Balance, Shares issued at Dec. 31, 2016	87,495				87,495,000
Net income			101,281		$ 101,281
Other comprehensive income				16,093	16,093
Comprehensive income			101,281	16,093	117,374
Cash dividends declared ($0.48 per common share)			(41,594)		(41,594)
Common stock activity, long-term incentive plan		16,801	83		16,884
Issuance of stock from dividend reinvestment and stock purchase plan		1,530			1,530
Balance at Jun. 30, 2017	$ 291,358	$ 1,716,584	$ 910,459	$ (104,439)	$ 2,813,962
Balance, Shares Issued at Jun. 30, 2017	87,495				87,495,000

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
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, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 101,281	$ 50,746
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,960	14,344
Provision for loan losses	30,942	77,232
(Gain) loss on other real estate owned	(2,408)	127
Deferred tax expense (benefit)	5,415	(10,663)
Increase in cash surrender value of life insurance contracts	(7,430)	(5,384)
Loss (gain) on disposal of other assets	1,455	(4,690)
Net decrease (increase) in loans held for sale	8,177	(21,170)
Net amortization of securities premium/discount	14,944	12,905
Amortization of intangible assets	10,462	10,129
Amortization of FDIC indemnification asset	2,427	3,139
Stock-based compensation expense	8,360	7,164
Decrease in interest payable and other liabilities	(24,405)	(2,683)
Net payments to FDIC for loss share claims	(935)	(159)
Decrease in FDIC loss share receivable	8,613	7,426
Decrease in other assets	8,259	37,117
Other, net	3,595	2,525
Net cash provided by operating activities	182,712	178,105
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	213,877	102,335
Proceeds from maturities of securities available for sale	157,290	186,790
Purchases of securities available for sale	(425,096)	(461,139)
Proceeds from maturities of securities held to maturity	174,662	190,721
Purchases of securities held to maturity	(554,442)	(282,190)
Net decrease in short-term investments	317,042	412,396
Proceeds from sales of loans		106,660
Net increase in loans	(385,823)	(470,732)
Purchase of life insurance contracts	(50,000)	(40,000)
Purchases of property and equipment	(12,649)	(3,950)
Proceeds from sales of property and equipment	16	671
Proceeds from sales of other real estate	12,311	8,995
Net of cash paid for FNBC I acquisition	(322,708)
Net cash received for FNBC II acquisition	798,367
Other, net	(38,414)	2,989
Net cash used in investing activities	(115,567)	(246,454)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	90,040	467,973
Net decrease in short-term borrowings	(11,134)	(328,537)
Repayments of long-term debt	(121,837)	(28,836)
Net proceeds from issuance of long-term debt	83	5,885
Dividends paid	(41,594)	(38,238)
Cash paid for taxes with forfeited shares of stock	(3,124)	(380)
Proceeds from exercise of stock options	11,427	36
Proceeds from dividend reinvestment and stock purchase plan	1,530
Net cash (used in) provided by financing activities	(74,609)	77,903
NET (DECREASE) INCREASE IN CASH AND DUE FROM BANKS	(7,464)	9,554
CASH AND DUE FROM BANKS, BEGINNING	372,689	303,874
CASH AND DUE FROM BANKS, ENDING	365,225	313,428
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	$ 2,855	$ 10,526

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2017
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, ne cessary to present the Company’s financial condition, results of operations, changes in stockholders’ equity and cash flows for the interim periods presented. The Company has also evaluated all subsequent events for potential recognition and disclosure through the date of the filing of this Form 10-Q. Some financial information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) have been condensed or omitted in this Form 10-Q pursuant to Securities and Exchange Commission rules and regulations. These financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. 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. Select Stockholders’ Equity line items in the Consolidated Balance Sheets and Statements of Changes in Stockholders’ Equity have been modified to simplify the presentation as discussed in Note 7 – Stockholders’ Equity. Presentation of derivatives contracts cleared through a central clearing cou nterparty has been revised prospectively to reflect netting of variation margin as settlements to the derivative assets and liabilities rather than collateral, effective January 3, 2017, as discussed in Note 6 – Derivatives. These changes in presentation 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 during the reporting period 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, 2016. 

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2017
Acquisitions [Abstract]
Acquisitions	2. Acquisitions  On March 10, 2017, the Company , through its banking subsidiary, Whitney Bank (“Whitney”), completed the acquisition of certain assets and liabilities, including nine branches, from First NBC Bank (“FNBC”), referred to as the FNBC I transaction. Whitney paid approximately $323 million in cash consideration ( $326 million cash paid net of $3 million in branch cash acquired), including a $41.6 million transaction premium for the earnings stream acquired.  On April 28, 2017, the Louisiana Office of Financial Institutions (“OFI”) closed FNBC and appointed the FDIC as receiver. Whitney signed a purchase and assumption agreement with the FDIC to acquire certain additional assets and liabilities of FNBC, referred to as the FNBC II transaction. Whitney continued operations of FNBC’s 29 branch locations ( 24 in Louisiana and five in Florida) and acquired select assets and assumed select liabilities, including substantially all of the transaction and savings deposits. Whitney paid a premium of $35 million to the FDIC for the earnings stream acquired and received $798 million in cash ( $640 million in preliminary settlements for the net liabilities assumed and $158 million in branch cash acquired).  Under the FNBC II purchase and assumption agreement, Whitney had an option to purchase (or assume the leases for) the branch and non-branch locations, including furniture, fixtures, and equipment subsequent to the date of the transaction, subject to FDIC approval. This option was exercised for seven branches and will add additional acquired assets from this transaction in the third quarter of 2017. A final cash settlement with the FDIC is expected to occur in the second half of 2017.  The FNBC I and FNBC II transactions were accounted for as business combinations and therefore, assets acquired and liabilities assumed were recorded at estimated fair values on the acquisition dates. The following table sets forth the acquisition date preliminary fair value of the assets acquired and liabilities assumed, consideration, and the resulting goodwill recorded in each of the FNBC I and FNBC II transactions, and in the aggregate.     FNBC I FNBC II  (in thousands) March 10, 2017 April 28, 2017 Total  ASSETS  Cash and due from banks $ 2,856 $ 157,932 $ 160,788  Interest-bearing time deposits with other banks — 382,622 382,622  Fed funds sold and other short-term investments — 148 148  Securities — 213,877 213,877  Total loans 1,211,523 165,577 1,377,100  Property and equipment 11,837 500 12,337  Accrued interest receivable 2,969 885 3,854  Identifiable intangible assets 3,900 20,500 24,400  Other assets 63 4,097 4,160  Total identifiable assets 1,233,148 946,138 2,179,286   LIABILITIES  Deposits 398,171 1,530,338 1,928,509  Short-term borrowings 510,749 85,886 596,635  Long-term debt 93,120 — 93,120  Other liabilities 1,607 3,079 4,686  Total liabilities 1,003,647 1,619,303 2,622,950  Net identifiable assets acquired (liabilities assumed) 229,501 (673,165) (443,664)  Consideration  Cash (paid) received (325,564) 640,435 314,871  Unsettled net consideration receivable from FDIC — 9,721 9,721  Total consideration (325,564) 650,156 324,592  Goodwill $ 96,063 $ 23,009 $ 119,072   The loans acquired were recorded at estimated fair value at the acquisition dates with no carryover of the related allowance for loan losses. The acquired loans were considered to be performing (“purchased credit performing”) based on such factors as past due status, nonaccrual status and are accounted for under Accounting Standards Codification (“ASC”) 310-20. The unpaid principal balance of the loans acquired totaled $1.4 billion, of which approximately $47.6 million is not expected to be collected. The difference at the acquisition dates between the fair value and the contractual amounts due (the “fair value discount”) of $57.5 million will be accreted into income over the estimated lives of the loan pools established in the valuation.  The Company assumed approximately $604 million of borrowings in the FNBC I transaction, consisting of both short-term and long-term Federal Home Loan Bank (“FHLB”) borrowings. The short-term borrowings consist of $460 million in variable-rate term notes; $200 million matures in 2025 and $260 million matures in 2026 . These notes re-price quarterly and may be re-paid at the Company’s option, either in whole or in-part, on any quarterly re-pricing date. Also included in short-term borrowings are $51 million in fixed-rate term notes that mature in 2017 . The long-term borrowings include $93.1 million in fixed-rate term notes; $88 million that mature in 2018 , $3.2 million that mature in 2019 , and $1.9 million that mature in 2023 . Short-term borrowings in the FNBC II transaction consisted of securities sold under repurchase agreements.  Identifiable intangible assets consist of core deposit intangibles totaling $24.4 million that are being amortized using sum of years’ digits over the asset’s life of eight years for the FNBC I transaction and nine years for the FNBC II transaction. Goodwill totaling $119 million represents the excess of the consideration paid over the fair value of the net assets acquired, or the excess of the fair value of the liabilities assumed over the net consideration received. The tax basis of goodwill generated from these transactions is expected to be deductible for federal income tax purposes.     Goodwill balance at December 31, 2016 $ 621,193  Additions:  Goodwill from FNBC I 96,063  Goodwill from FNBC II 23,009  Goodwill balance at June 30, 2017 $ 740,265  Goodwill for the FNBC I transaction was adjusted by $495,000 in the second quarter of 2017 related to changes to a property valuation. The Company expects to adjust goodwill for the FNBC II transaction as we finalize purchase accounting and complete the final settlement with the FDIC.   The operating results of the Company for the three and six months ended June 30, 2017 include the results from the operations acquired in the FNBC transactions since the respective acquisition dates. Estimating reliable historical financial information is impracticable as only selected components of the businesses, as historically operated, were acquired. A number of post-acquisition events, including the consolidation of certain branch locations and the integration of operations, cash and investments acquired make quantifying discrete earnings contributions of the businesses acquired impracticable. As such, neither supplemental pro forma financial information of the combined entity, nor revenue and earnings contributed by the businesses acquired since the dates of acquisition are presented.  The Company incurred merger-related costs in connection with the FNBC I and FNBC II transactions. The following table reflects the merger-related costs for the three and six months ended June 30, 2017 for both the FNBC I and FNBC II transactions combined. The Company expects to incur additional merger-related expense in the third quarter of 2017.     (in thousands) Three months ended June 30, 2017 Six months ended June 30, 2017  Personnel expense $ 1,435 $ 1,542  Net occupancy and equipment expense 276 277  Professional services expense 2,200 6,827  Other real estate (1,511) (1,511)  Advertising expense 901 1,031  Other expense 713 2,311  Total merger-related expenses $ 4,014 $ 10,477 

Securities

Securities	6 Months Ended
	Jun. 30, 2017
Securities [Abstract]
Securities	3 . Securities The amortized cost and estimated fair value of securities classified as available for sale and held to maturity follow.      Securities Available for Sale  (in thousands) June 30, 2017 December 31, 2016   Gross Gross Gross Gross  Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair  Cost Gains Losses Value Cost Gains Losses Value  U.S. Treasury and government agency securities $ 76,146 $ — $ 1,306 $ 74,840 $ 56,751 $ — $ 1,923 $ 54,828  Municipal obligations 250,598 499 5,941 245,156 253,228 113 11,186 242,155  Residential mortgage-backed securities 1,860,644 9,765 16,310 1,854,099 1,620,191 10,592 19,428 1,611,355  Commercial mortgage-backed securities 449,912 463 17,277 433,098 425,750 — 23,159 402,591  Collateralized mortgage obligations 183,987 254 552 183,689 202,580 490 591 202,479  Corporate debt securities 3,500 — — 3,500 3,500 — — 3,500  $ 2,824,787 $ 10,981 $ 41,386 $ 2,794,382 $ 2,562,000 $ 11,195 $ 56,287 $ 2,516,908      Securities Held to Maturity  (in thousands) June 30, 2017 December 31, 2016  Gross Gross Gross Gross  Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair  Cost Gains Losses Value Cost Gains Losses Value  U.S. Treasury and government agency securities $ 50,000 $ — $ 64 $ 49,936 $ 50,000 $ — $ 44 $ 49,956  Municipal obligations 730,599 7,205 9,614 728,190 648,093 2,147 20,175 630,065  Residential mortgage-backed securities 796,190 7,402 1,315 802,277 862,162 4,329 3,068 863,423  Commercial mortgage-backed securities 75,705 — 2,637 73,068 75,739 — 4,038 71,701  Collateralized mortgage obligations 1,221,960 1,690 10,592 1,213,058 864,226 1,420 10,674 854,972  $ 2,874,454 $ 16,297 $ 24,222 $ 2,866,529 $ 2,500,220 $ 7,896 $ 37,999 $ 2,470,117  The following table presents the amortized cost and estimated fair value of debt securities at June 30, 2017 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.       Debt Securities Available for Sale Amortized Fair  (in thousands) Cost Value  Due in one year or less $ 7,945 $ 7,970  Due after one year through five years 38,273 38,767  Due after five years through ten years 997,109 980,311  Due after ten years 1,781,460 1,767,334  Total available for sale debt securities $ 2,824,787 $ 2,794,382   Amortized Fair  Debt Securities Held to Maturity Cost Value  Due in one year or less $ 9,995 $ 10,058  Due after one year through five years 108,634 109,069  Due after five years through ten years 851,644 845,017  Due after ten years 1,904,181 1,902,385  Total held to maturity securities $ 2,874,454 $ 2,866,529 The Company held no securities c lassified as trading at June 30 , 2017 or December 31, 2016. The fair value and gross unrealized losses for securities classified as available for sale with unrealized losses for the periods indicated follow.     Available for Sale  June 30, 2017 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 $ 74,308 1,306 $ — $ — $ 74,308 $ 1,306  Municipal obligations 213,557 5,941 — — 213,557 5,941  Residential mortgage-backed securities 1,315,878 16,245 2,539 65 1,318,417 16,310  Commercial mortgage-backed securities 407,937 17,277 — — 407,937 17,277  Collateralized mortgage obligations 74,282 552 — — 74,282 552  Equity securities — — — — — —  $ 2,085,962 $ 41,321 $ 2,539 $ 65 $ 2,088,501 $ 41,386       Available for Sale  December 31, 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  U.S. Treasury and government agency securities $ 54,788 $ 1,923 $ — $ — $ 54,788 $ 1,923  Municipal obligations 228,588 11,186 — — 228,588 11,186  Residential mortgage-backed securities 1,087,644 19,359 3,738 69 1,091,382 19,428  Commercial mortgage-backed securities 402,591 23,159 — — 402,591 23,159  Collateralized mortgage obligations 83,701 591 — — 83,701 591  Corporate debt securities — — — — —  $ 1,857,312 $ 56,218 $ 3,738 $ 69 $ 1,861,050 $ 56,287  The fair value and gross unrealized losses for securities classified as held to maturity with unrealized losses for the periods indicated follow.      Held to maturity  June 30, 2017 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 $ 49,936 $ 64 $ — $ — $ 49,936 $ 64  Municipal obligations 432,877 9,311 7,204 303 440,081 9,614  Residential mortgage-backed securities 268,110 1,315 — — 268,110 1,315  Commercial mortgage-backed securities 73,068 2,637 — — 73,068 2,637  Collateralized mortgage obligations 842,667 7,113 134,129 3,479 976,796 10,592  $ 1,666,658 $ 20,440 $ 141,333 $ 3,782 $ 1,807,991 $ 24,222      Held to maturity  December 31, 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  U.S. Treasury and government agency securities $ 49,956 $ 44 $ — $ — $ 49,956 $ 44  Municipal obligations 494,470 19,706 11,750 469 506,220 20,175  Residential mortgage-backed securities 278,369 3,068 — — 278,369 3,068  Commercial mortgage-backed securities 71,701 4,038 — — 71,701 4,038  Collateralized mortgage obligations 618,739 7,296 115,375 3,378 734,114 10,674  $ 1,513,235 $ 34,152 $ 127,125 $ 3,847 $ 1,640,360 $ 37,999 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 o f the securities or the issuers’ abilities 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 $213.9 million with no gross gain or loss and $102.3 million with a gross gain of $ 1.1 million and no loss for the six months ended June 30, 2 017 and 2016 , respectively . Securities with carrying values totaling $ 3.8 billion at June 30, 2017 and December 31, 2016 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, 2017
Loans and Allowance for Loan Losses [Abstract]
Loans and Allowance for Loan Losses	4. Loans and Allowance for Loan Losses The Company generally makes loans in its market areas of south Mississippi, southern and central Alabama, south Louisiana, the Houston, Texas areas and the northern, central and panhandle regions of Florida. Loans, net of unearned income, by portfolio are presented in the table below.      June 30, December 31,  (in thousands) 2017 2016  Commercial non-real estate $ 8,093,104 $ 7,613,917  Commercial real estate - owner occupied 2,078,332 1,906,821  Total commercial & industrial 10,171,436 9,520,738  Commercial real estate - income producing 2,401,673 2,013,890  Construction and land development 1,313,522 1,010,879  Residential mortgages 2,493,923 2,146,713  Consumer 2,093,287 2,059,931  Total loans $ 18,473,841 $ 16,752,151   The following briefly describes the composition of each loan category.  Commercial and industrial  Commercial and industrial loans are made available to businesses for working capital (including financing of inventory and receivables), business expansion, to facilitate the acquisition of a business, and the purchase of equipment and machinery, including equipment leasing. These loans are primarily made based on the identified cash flows of the borrower and, when secured, have the added strength of the underlying collateral.  Commercial non-real estate loans may be secured by the assets being financed or other business assets such as accounts receivable, inventory, ownership or commodity interests, and may incorporate a personal or corporate guarantee; however, some short-term loans may be made on an unsecured basis, including a small portfolio of corporate credit cards, generally issued as a part of overall customer relationships.  Commercial real estate – owner occupied loans consist of commercial mortgages on properties where repayment is generally dependent on the cash flow from the ongoing operations and activities of the borrower. Like commercial non-real estate, these loans are primarily made based on the identified cash flows of the borrower, but also have the added strength of the value of underlying real estate collateral.  Commercial real estate – income producing  Commercial real estate – income producing loans consist of loans secured by commercial mortgages on properties where the loan is made to real estate developers or investors and repayment is dependent on the sale, refinance, or income generated from the operation of the property. Properties financed include retail, office, multifamily, senior housing, hotel/motel, skilled nursing facilities and other commercial properties.  Construction and land development  C onstruction and land development loans are made to facilitate t he acquisition, development, improvement and construction of both commercial and residential-purpose properties. Such loans are made to builders and investors where repayment is expected to be made from the sale, refinance or operation of the property or to businesses to be used in their business operations. This portfolio also includes a small amount of residential construction loans and loans secured by raw land not yet under development.  Residential Mortgages  Residential mortgages consist of closed-end loans secured by first liens on 1- 4 family residential properties. The portfolio includes both fixed and adjustable rate loans, although most longer-term, fixed-rate loans originated are sold in the secondary mortgage market .  Consumer  Consumer loans include second lien mortgage home loans, home equity lines of credit and nonresidential consumer purpose loans. Nonresidential consumer loans include both direct and indirect loans. Direct nonresidential consumer loans are made to finance the purchase of personal property, including automobiles, recreational vehicles and boats, and for other personal purposes (secured and unsecured), and deposit account secured loans. Indirect nonresidential loans include automobile financing provided to the consumer through an agreement with automobile dealerships. Consumer loans also include a small portfolio of credit card receivables issued on the basis of applications received through referrals from the Bank’s branches, online and other marketing efforts.  Allowance for Loan Losses The following schedule shows activity in the allowance for loan losses by portfolio class for the six months ended June 30, 2017 and 2016, 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, 2017  Allowance for loan losses:  Beginning balance $ 147,052 $ 11,083 $ 158,135 $ 13,509 $ 6,271 $ 25,361 $ 26,142 $ 229,418  Purchased credit impaired activity:  Charge-offs — — — — (58) (86) (153) (297)  Recoveries 2 93 95 — 39 19 71 224  Net provision for loan losses (46) (245) (291) (61) (148) (10) (112) (622)  Decrease in FDIC loss share receivable (47) — (47) — — (2,344) (135) (2,526)  Non-purchased credit impaired activity:  Charge-offs (26,218) (517) (26,735) (160) (114) (690) (15,107) (42,806)  Recoveries 1,816 243 2,059 398 716 262 3,475 6,910  Net provision for loan losses 14,804 1,441 16,245 (146) 343 868 14,254 31,564  Ending balance $ 137,363 $ 12,098 $ 149,461 $ 13,540 $ 7,049 $ 23,380 $ 28,435 $ 221,865  Ending balance:  Allowance:  Individually evaluated for impairment $ 22,758 $ 280 $ 23,038 $ 1,402 $ 1 $ 172 $ 283 $ 24,896  Amounts related to purchased credit impaired loans 395 742 1,137 192 239 12,622 942 15,132  Collectively evaluated for impairment 114,210 11,076 125,286 11,946 6,809 10,586 27,210 181,837  Total allowance $ 137,363 $ 12,098 $ 149,461 $ 13,540 $ 7,049 $ 23,380 $ 28,435 $ 221,865  Loans:  Individually evaluated for impairment $ 250,256 $ 7,480 $ 257,736 $ 14,913 $ 847 $ 3,466 $ 1,053 $ 278,015  Purchased credit impaired loans 5,422 9,848 15,270 6,247 4,160 129,198 8,280 163,155  Collectively evaluated for impairment 7,837,426 2,061,004 9,898,430 2,380,513 1,308,515 2,361,259 2,083,954 18,032,671  Total loans $ 8,093,104 $ 2,078,332 $ 10,171,436 $ 2,401,673 $ 1,313,522 $ 2,493,923 $ 2,093,287 $ 18,473,841        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)  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    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) 2017 2016  Commercial non-real estate $ 167,710 $ 249,037  Commercial real estate - owner occupied 11,750 14,413  Total commercial & industrial 179,460 263,450  Commercial real estate - income producing 13,438 13,954  Construction and land development 2,821 4,550  Residential mortgages 28,158 23,665  Consumer 14,342 12,351  Total loans $ 238,219 $ 317,970  Nonaccrual loans include loans modified in troubled debt restructurings (“TDRs”) of $96.3 million and $81.9 million at June 30, 2017 and December 31, 2016, respectively. Total TDRs, both accruing and nonaccruing, were $186.8 million as of June 30, 2017 and $121.7 million at December 31, 2016. All TDRs are individually evaluated for impairment. The table below details TDRs that were modified during the six months ended June 30, 2017 and June 30, 2016 by portfolio class.      Six months ended  ($ in thousands) June 30, 2017 June 30, 2016  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 37 $ 92,976 $ 92,976 17 $ 57,915 $ 57,915  Commercial real estate - owner occupied 4 3,734 3,734 — — —  Total commercial & industrial 41 96,710 96,710 17 57,915 57,915  Commercial real estate - income producing 5 6,486 6,486 — — —  Construction and land development — — — — — —  Residential mortgages 6 1,098 1,098 4 432 432  Consumer 1 40 42 — — —  Total loans 53 $ 104,334 $ 104,336 21 $ 58,347 $ 58,347  The TDRs during the six months ended June 30, 2017 reflected in the table above include $28.4 million of loans with extended amortization terms or other payment concessions, $40.2 million of loans with significant covenant waivers and $35.7 million with other modifications. The TDRs during the six months ended June 30, 2016 include $31.0 million of loans with extended terms or other payment concessions and $27.3 million of other modifications. No TDRs that subsequently defaulted within twelve months of modification were recorded in the six months ended June 30, 2017 or 2016. The tables below present loans that are individually evaluated for impairment disaggregated by portfolio class at June 30, 2017 and December 31, 2016. 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, 2017  Recorded investment Recorded investment Unpaid  (in thousands) without an allowance with an allowance principal balance Related allowance  Commercial non-real estate $ 107,555 $ 142,701 $ 260,544 $ 22,758  Commercial real estate - owner occupied 3,514 3,966 7,570 280  Total commercial & industrial 111,069 146,667 268,114 23,038  Commercial real estate - income producing 5,678 9,235 15,349 1,402  Construction and land development 831 16 1,820 1  Residential mortgages 2,338 1,128 3,984 172  Consumer 1 1,052 1,055 283  Total loans $ 119,917 $ 158,098 $ 290,322 $ 24,896    December 31, 2016  Recorded investment Recorded investment Unpaid  (in thousands) without an allowance with an allowance principal balance Related allowance  Commercial non-real estate $ 150,650 $ 120,612 $ 295,445 $ 28,187  Commercial real estate - owner occupied 4,261 2,007 6,646 246  Total commercial & industrial 154,911 122,619 302,091 28,433  Commercial real estate - income producing 10,447 4,929 15,708 466  Construction and land development 1,106 832 2,903 38  Residential mortgages 2,877 1,470 4,865 91  Consumer — 2,154 2,155 267  Total loans $ 169,341 $ 132,004 $ 327,722 $ 29,295  The tables below present the average balances and interest income for total impaired loans for the three and six months ended June 30, 2017 and 2016. Interest income recognized represents interest on accruing loans modified in a TDR.      Three months ended  June 30, 2017 June 30, 2016  Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 241,122 $ 597 $ 216,907 $ 493  Commercial real estate - owner occupied 5,687 18 5,959 14  Total commercial & industrial 246,809 615 222,866 507  Commercial real estate - income producing 14,257 34 8,242 22  Construction and land development 1,219 — 7,660 —  Residential mortgages 3,352 3 976 2  Consumer 1,601 3 112 1  Total loans $ 267,238 $ 655 $ 239,856 $ 532                    Six months ended  June 30, 2017 June 30, 2016  Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 246,374 $ 934 $ 179,117 $ 847  Commercial real estate - owner occupied 5,384 22 5,836 29  Total commercial & industrial 251,758 956 184,953 876  Commercial real estate - income producing 14,372 77 9,072 43  Construction and land development 1,492 — 10,905 —  Residential mortgages 3,572 5 932 4  Consumer 1,876 5 109 2  Total loans $ 273,070 $ 1,043 $ 205,971 $ 925    Aging Analysis The tables below present the age analysis of past due loans by portfolio class at June 30, 2017 and December 31, 2016. 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, 2017 past due past due past due past due Current Loans still accruing  (in thousands)  Commercial non-real estate $ 27,751 $ 27,974 $ 91,987 $ 147,712 $ 7,945,392 $ 8,093,104 $ 13,088  Commercial real estate - owner occupied 4,532 1,189 6,321 12,042 2,066,290 2,078,332 424  Total commercial & industrial 32,283 29,163 98,308 159,754 10,011,682 10,171,436 13,512  Commercial real estate - income producing 3,369 2,319 5,040 10,728 2,390,945 2,401,673 1,989  Construction and land development 6,250 619 1,980 8,849 1,304,673 1,313,522 —  Residential mortgages 25,433 12,208 22,088 59,729 2,434,194 2,493,923 2,801  Consumer 15,764 5,843 7,600 29,207 2,064,080 2,093,287 88  Total $ 83,099 $ 50,152 $ 135,016 $ 268,267 $ 18,205,574 $ 18,473,841 $ 18,390      Recorded  Greater than investment  30-59 days 60-89 days 90 days Total Total > 90 days and  December 31, 2016 past due past due past due past due Current Loans still accruing  (in thousands)  Commercial non-real estate $ 19,722 $ 1,909 $ 68,505 $ 90,136 $ 7,523,781 $ 7,613,917 $ 384  Commercial real estate - owner occupied 3,008 581 6,310 9,899 1,896,922 1,906,821 52  Total commercial & industrial 22,730 2,490 74,815 100,035 9,420,703 9,520,738 436  Commercial real estate - income producing 838 50 5,026 5,914 2,007,976 2,013,890 216  Construction and land development 694 171 5,300 6,165 1,004,714 1,010,879 1,563  Residential mortgages 24,599 8,816 14,369 47,784 2,098,929 2,146,713 1  Consumer 18,621 7,441 9,147 35,209 2,024,722 2,059,931 823  Total $ 67,482 $ 18,968 $ 108,657 $ 195,107 $ 16,557,044 $ 16,752,151 $ 3,039  Credit Quality Indicators The following tables present the credit quality indicators by segments and portfolio class of loans at June 30, 2017 and December 31, 2016.      June 30, 2017  (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 $ 6,897,989 $ 1,859,185 $ 8,757,174 $ 2,214,329 $ 1,233,082 $ 12,204,585  Pass-Watch 298,254 55,146 353,400 117,247 58,024 528,671  Special Mention 215,373 43,219 258,592 13,840 7,591 280,023  Substandard 678,032 120,782 798,814 56,247 14,825 869,886  Doubtful 3,456 — 3,456 10 — 3,466  Loss — — — — — —  Total $ 8,093,104 $ 2,078,332 $ 10,171,436 $ 2,401,673 $ 1,313,522 $ 13,886,631   December 31, 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 $ 6,364,348 $ 1,719,114 $ 8,083,462 $ 1,873,644 $ 968,505 $ 10,925,611  Pass-Watch 203,311 47,676 250,987 78,309 22,592 351,888  Special Mention 181,763 40,299 222,062 22,492 4,142 248,696  Substandard 846,793 99,732 946,525 39,434 15,640 1,001,599  Doubtful 17,702 — 17,702 11 — 17,713  Loss — — — — — —  Total $ 7,613,917 $ 1,906,821 $ 9,520,738 $ 2,013,890 $ 1,010,879 $ 12,545,507       June 30, 2017 December 31, 2016  (in thousands) Residential mortgage Consumer Total Residential mortgage Consumer Total  Performing $ 2,462,964 $ 2,078,857 $ 4,541,821 $ 2,123,048 $ 2,046,757 $ 4,169,805  Nonperforming 30,959 14,430 45,389 23,665 13,174 36,839  Total $ 2,493,923 $ 2,093,287 $ 4,587,210 $ 2,146,713 $ 2,059,931 $ 4,206,644 Below are the definitions of the Company’s internally assigned grades: Commercial : · Pass – loans properly approved, documented, collateralized, and performing which do not reflect an abnormal credit risk. · Pass-Watch – credits in this category are of sufficient risk to cause concern. This category is reserved for credits that display negative performance trends. The “Watch” grade should be regarded as a transition category. · Special Mention – a criticized asset category defined as having potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may, at some future date, result in the deterioration of the repayment prospects for the credit or the institution’s credit position. Special mention credits are not considered part of the Classified credit categories and do not expose the institution to sufficient risk to warrant adverse classification. · Substandard – an asset that is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Assets so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. · Doubtful – an asset that has all the weaknesses inherent in one classified Substandard with the added characteristic that the weaknesses make collection or 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 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, 2017 and the year ended December 31, 2016.      June 30, 2017 December 31, 2016  Carrying Carrying  Amount Accretable Amount Accretable  (in thousands) of Loans Yield of Loans Yield  Balance at beginning of period $ 190,915 $ 113,686 $ 225,838 $ 129,488  Payments received, net (36,950) (6,258) (55,194) (11,024)  Accretion 9,190 (9,190) 20,271 (20,271)  Increase in expected cash flows based on actual cash flows and changes in cash flow assumptions — 4,405 — 5,358  Net transfers from nonaccretable difference to accretable yield — 5,183 — 10,135  Balance at end of period $ 163,155 $ 107,826 $ 190,915 $ 113,686  Loans Acquired in an FDIC-Assisted Transaction and the Related FDIC Loss Share Receivable  Loans purchased in the 2009 acquisition of Peoples First Community Bank were covered by two loss share agreements between the FDIC and the Company. In the second quarter of 2017, the Company reached an agreement with the FDIC to terminate the agreements on the remaining covered loan balances, totaling $154 million at June 30, 2017. The Company wrote down the indemnification asset by $6.6 million to the settlement amount of $3.2 million in the second quarter of 2017, with the final payment to occur in the third quarter of 2017. The following schedule shows activity in the FDIC loss share receivable for the six months ended June 30, 2017 and 2016 .       June 30, June 30,  (in thousands) 2017 2016  Beginning Balance $ 16,219 $ 29,868  Amortization (2,427) (3,139)  Charge-offs, write-downs and other recoveries (2,442) (2,683)  External expenses qualifying under loss share agreement 79 307  Adjustment due to changes in cash flow projections (2,526) (3,437)  Net payments to FDIC 934 159  Write-down for termination of loss share agreement (6,603) —  Ending balance $ 3,234 $ 21,075  Residential Mortgage Loans in Process of Foreclosure  Included in loans are $4.2 million and $10. 1 million of consumer loans secured by single family residential real estate that are in process of foreclosure as of June 30, 2017 and December 31, 2016, respectively. 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 $2.7 million and $3.1 million of foreclosed single family residential properties in other real estate owned as of June 30, 2017 and December 31, 2016, respectively.

Securities Sold under Agreement

Securities Sold under Agreements to Repurchase	6 Months Ended
	Jun. 30, 2017
Securities Sold under Agreements to Repurchase [Abstract]
Securities Sold under Agreements to Repurchase	5. Securities Sold under Agreements to Repurchase Included in short-term borrowings are customer securities sold under agreements to repurchase (“repurchase agreements”) that mature daily and are secured by U.S. agency securities totaling $482.1 million and $358.1 million at June 30, 2017 and December 31, 2016, respectively . The Company borrows funds on a secured basis by selling securities under agreements to repurchase, mainly 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 limited.

Derivatives

Derivatives	6 Months Ended
	Jun. 30, 2017
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 and fixed-rate brokered deposits. The Bank also enters into interest rate derivative agreements as a service to certain qualifying customers. The Bank manages a matched book with respect to these customer derivatives in order to minimize its net risk exposure resulting from such agreements. The Bank also enters into risk participation agreements under which it may either sell or buy credit risk associated with a customer’s performance under certain interest rate derivative contracts related to loans in which participation interests have been sold to or purchased from other banks. Fair Values of Derivative Instruments on the Balance Sheet The table below presents the notional amounts and fair values of the Company’s derivative financial instruments as well as their classification on the consolidated balance sheets as of June 30, 2017 and December 31, 2016. Effective January 3, 2017, the Company’s central clearing counterparty amended its rulebook to legally characterize variation margin accounts as settlements, rather than being reflected separately as collateral. As a result of that change, the Company began prospectively reflecting derivative assets and liabilities net of the central clearing counterparty derivative margin account.      June 30, 2017 December 31, 2016  Derivative (1) Derivative (1)  (in thousands) Type of Hedge Notional or Contractual Amount Assets Liabilities Notional or Contractual Amount Assets Liabilities  Derivatives designated as hedging instruments:  Interest rate swaps Cash Flow $ 750,000 $ 18 $ 7,619 $ 1,100,000 $ — $ 7,787  Interest rate swaps Fair Value 363,000 — 518 — — —  $ 1,113,000 $ 18 $ 8,137 $ 1,100,000 $ — $ 7,787  Derivatives not designated as hedging instruments:  Interest rate swaps (2) N/A $ 1,130,367 $ 17,536 $ 18,011 $ 979,391 $ 18,405 $ 18,362  Risk participation agreements N/A 111,667 39 117 84,732 50 105  Forward commitments to sell residential mortgage loans N/A 87,204 7 825 75,676 900 221  Interest rate-lock commitments on residential mortgage loans N/A 66,483 563 5 46,840 189 228  Foreign exchange forward contracts N/A 56,016 1,606 1,562 56,152 771 729  1,451,737 19,751 20,520 1,242,791 20,315 19,645  Total derivatives $ 2,564,737 $ 19,769 $ 28,657 $ 2,342,791 $ 20,315 $ 27,432  Less: netting adjustment (3) (2,894) (16,444) — —  Total derivative assets/liabilities $ 16,875 $ 12,213 $ 20,315 $ 27,432 (1) Derivative assets and liabilities are reported at fair value in 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.  (3) Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information.  Cash Flow Hedges of Interest Rate Risk The Company is party to various interest rate swap agreements designated and qualify ing as cash flow hedges of the Company’s forec asted variable cash flows for pool s of variable rate loans. For each agreement, the Company receives interest at a fixed rate and p ays at a variable rate. The swap agreements at June 30, 2017 expire as follows: notional amount of $250 million expire in 2019 ; $200 million expire in 2020 ; and $300 million expire in 2022 . 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 s recognized directly in earnings during the three or six months ended June 30, 2017 and 2016 .  Fair Value Hedges of Interest Rate Risk  During 2017, the Company entered into interest rate swap agreements that modify the Company’s exposure to interest rate risk by effectively converting a portion of the Company’s brokered certificates of deposit from fixed rates to variable rates. The maturities and call features of these interest rate swaps match the features of the hedged deposits. As interest rates fall, the decline in the value of the certificates of deposit is offset by the increase in the value of the interest rate swaps. Conversely, as interest rates rise, the value of the underlying deposits increase, but the value of the interest rate swaps decrease, resu lting in no impact on earnings. Interest expense is adjusted by the difference between the fixed and floating rates for the period the swaps are in effect. Hedge ineffectiveness on these transactions results in an increase or decrease of noninterest income. 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 $2.7 million and $3.1 million for the three and six months ended June 30, 2017, respectively, and $0.5 million and $0.4 million for the three and six months ended June 30, 2016 , respectively. The impact to interest income from cash flow hedges was ($0.2) million and ($0.1) million for the three and six months ended June 30, 2017, respectively and $0.7 million and $1.0 million for the three and six months ended June 30, 2016, respectively. For the six months ended June 30, 2017, t he fair value hedge s entered into during the period reduced interest expense on deposits by $0.4 million and reduced noninterest income by $0.1 million due to ineffectiveness . Credit risk-related Contingent Features Certain of the Bank’s derivative instruments contain provisions allowing the financial institution counterparty to terminate the contracts in ce rtain circumstances, such as a 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, 2017 , the aggregate fair value of derivative instruments with credit risk-related contingent features that were in a net liability position was $16.8 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. Agreements with certain bilateral counterparties require both parties to maintain collateral in the event the fair values of derivative instruments exceed established exposure thresholds. For centrally cleared derivatives, the Company is subject to initial margin posting and daily variation margin exchange with the central clearinghouses. As noted above, effective January 3, 2017, the Company began to reflect its derivative assets and liabilities net of the central clearing party variation margin account in the statement of financial position. Offsetting information in regards to all derivative assets and liabilities , including accrued interest, subject to these master netting agreements at June 30, 2017 and Decemb er 31, 2016 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, 2017  Derivative Assets $ 5,308 $ (3,963) $ 1,345 $ 1,345 $ — $ —   Derivative Liabilities $ 22,155 $ (16,392) $ 5,763 $ 1,345 $ 7,099 $ (2,681)      (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, 2016  Derivative Assets $ 4,788 $ — $ 4,788 $ 4,788 $ — $ —   Derivative Liabilities $ 26,846 $ — $ 26,846 $ 4,788 $ 19,095 $ 2,963  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, 2017
Stockholders' Equity [Abstract]
Stockholders' Equity	 7 . Stockholders’ Equity  The present ation of the components of stock holders’ equity was modified from prior filings to consolidate treasury stock into surplus in the consolidated balance sheets an d statements of changes in stock holders’ equity in order to simplify the presentation. Additional information on treasury s tock is reflected in the common shares outstanding section below.   Common Shares Outstanding  Shares outstanding exclude treasury shares of 1.0 million and 1.3 million at June 30 , 2017 and December 31, 2016, respectively, with a first-in-first-out cost basis of $17. 6 million and $24.1 mi llion at June 30, 2017 and December 31, 2016 , respectively. Shares outstanding also exclude unvested restricted share awards of 1. 7 million and 2.0 million at June 30, 2017 and December 31, 2016, respectively. A ccumulated Other Comprehensive Income (Loss) T he components of AOCI and changes in those components are presented in the following table.     Available HTM Securities  for Sale Transferred Employee Cash  (in thousands) Securities from AFS Benefit Plans Flow Hedges Total  Balance, December 31, 2015 $ 4,268 $ (16,795) $ (67,890) $ (178) $ (80,595)  Other comprehensive income (loss) before income taxes:  Net change in unrealized gain 41,990 — — 3,611 45,601  Reclassification of net (gain) loss 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)  Balance, December 31, 2016 $ (28,679) $ (14,392) $ (72,501) $ (4,960) $ (120,532)  Other comprehensive income (loss) before income taxes:  Net change in unrealized gain (loss) 14,687 — — (842) 13,845  Reclassification of net losses realized and included in earnings — — 3,105 — 3,105  Valuation adjustment for pension plan amendment (a) — — 17,315 — 17,315  Other valuation adjustments for employee benefit plan — — (10,782) — (10,782)  Amortization of unrealized net loss on securities transferred to HTM — 1,749 — — 1,749  Income tax expense (benefit) 5,333 657 3,458 (309) 9,139  Balance, June 30, 2017 $ (19,325) $ (13,300) $ (66,321) $ (5,493) $ (104,439)  (a) For further discussion on the pension plan amendment, see Note 11 – Retirement Plans. 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 associa ted 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. Subject to certain thresholds, unrealized losses on employee benefit plans will be reclassified into income as pension and post-retirement costs are recognized over the remaining service period of plan participants. Accumulated gains/losses on the cash flow hedge of the variable-rate loans described in Note 6 will be reclassified into income over the life of the hedge. Gains (losses) in AOCI are net of deferred income taxes. The following table shows the line items in the consolidated income statements affected by amounts reclassified from AOCI .      Six months ended  Amount reclassified from AOCI (a) June 30, Affected line item on  (in thousands) 2017 2016 the income statement  Gain on sale of AFS securities $ — $ 1,114 Securities transactions  Tax effect — (390) Income taxes  Net of tax — 724 Net income  Amortization of unrealized net loss on securities transferred to HTM (1,749) (1,628) Interest income  Tax effect 657 625 Income taxes  Net of tax (1,092) (1,003) Net income  Amortization of defined benefit pension and post-retirement items (3,105) (2,916) Employee benefits expense (b)  Tax effect 1,114 1,066 Income taxes  Net of tax (1,991) (1,850) Net income  Total reclassifications, net of tax $ (3,083) $ (2,129) Net income  (a) Amounts in parenthesis indicate reduction in net income.  (b) These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employ ee benefits expense (see Note 11 – Retirement Plans for additional details).

Other Noninterest Income

Other Noninterest Income	6 Months Ended
	Jun. 30, 2017
Other Noninterest Income [Abstract]
Other Noninterest Income	8 . Other Noninterest Income Components of other noninterest income are as follows.                         Three months e nded Six months ended  June 30, June 30,  (in thousands) 2017 2016 2017 2016  Income from bank-owned life insurance $ 2,883 $ 4,501 $ 5,535 $ 7,051  Credit related fees 2,898 2,267 5,776 4,624  Derivative income 2,680 533 3,145 394  Net (loss) gain on sale of assets (60) 1,801 4,065 3,566  Safety deposit box income 391 413 840 891  Other miscellaneous 4,082 2,041 6,388 4,376  Total other noninterest income $ 12,874 $ 11,556 $ 25,749 $ 20,902 

Other Noninterest Expense

Other Noninterest Expense	6 Months Ended
	Jun. 30, 2017
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) 2017 2016 2017 2016  Advertising $ 4,984 $ 2,693 $ 8,061 $ 5,050  Ad valorem and franchise taxes 3,519 2,340 6,555 4,643  Printing and supplies 1,330 1,065 2,508 2,176  Insurance expense 807 829 1,624 1,664  Travel expense 1,350 1,079 2,409 2,028  Entertainment and contributions 1,982 2,001 3,765 3,633  Tax credit investment amortization 1,213 1,833 2,425 3,576  Write-down for termination of FDIC loss share agreement 6,603 — 6,603 —  Other miscellaneous 5,879 4,633 12,347 10,412  Total other noninterest expense $ 27,667 $ 16,473 $ 46,297 $ 33,182 

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
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) 2017 2016 2017 2016  Numerator:  Net income to common shareholders $ 52,267 $ 46,907 $ 101,281 $ 50,746  Net income allocated to participating securities - basic and diluted 1,166 1,136 2,322 1,233  Net income allocated to common shareholders - basic and diluted $ 51,101 $ 45,771 $ 98,959 $ 49,513  Denominator:  Weighted-average common shares - basic $ 84,614 $ 77,523 $ 84,489 $ 77,512  Dilutive potential common shares 253 157 266 164  Weighted-average common shares - diluted $ 84,867 $ 77,680 $ 84,755 $ 77,676  Earnings per common share:  Basic $ 0.60 $ 0.59 $ 1.17 $ 0.64  Diluted $ 0.60 $ 0.59 $ 1.17 $ 0.64  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 19,397 and 17,701 , respectively , for the three and six months ended June 30, 2017. Weighted-average anti-dilutive potential common shares totaled 548,821 and 602,809 , respectively, for the three and six months ended June 30, 2016.

Retirement Plans

Retirement Plans	6 Months Ended
	Jun. 30, 2017
Retirement Plans [Abstract]
Retirement Plans	11 . Retirement Plans  During the second quarter of 2017, the Company amended both the Hancock Holding Company Pension Plan and Trust Agreement (“Pension Plan”), a qualified defined benefit plan, and the Hancock Holding Company 401(k) Savings Plan and Trust Agreement (“401 (k) Plan”), a defined contribution plan. The Pension Plan was amended to exclude any individual hired or rehired by the Company after June 30, 2017 from eligibility to participate. The Pension Plan amendment further provides that the accrued benefit of each participant in the Pension Plan whose combined age plus years of service as of January 1, 2018 totals less than 55 will be frozen as of January 1, 2018 and will not thereafter increase. As a result of the plan amendments, pension assets and the benefit obligations were re-measured. As of June 30, 2017, pension assets totaled $537.6 million and the benefit obligation totaled $476.9 million. The impact of the amendment to the benefit obligation was a reduction of $17.3 million. The 401(k) Plan was amended for participants whose benefits are frozen under the Pension Plan, to add an enhanced Company contribution beginning January 1, 2018, in the amount of 2% , 4% or 6% of such participant’s eligible compensation, based on the participant’s age and years of service with the Company. The 401(k) Plan’s amendment further provides that the Company will contribute to the benefit of those associates of the Company hired or rehired after June 30, 2017 and those associates of the Company never enrolled in the Pension Plan an additional basic contribution in an amount equal to 2% of the associate’s eligible compensation beginning January 1, 2018. Participants will vest in the new basic and enhanced Company contributions upon completion of three years of service.  The Company also has a nonqualified defined benefit plan covering certa in legacy Whitney employees that was frozen as of December 31, 2012 and no future benefits are accrued under this plan . The Company 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, 2017 2016 2017 2016  Service cost $ 4,093 $ 3,611 $ 47 $ 45  Interest cost 4,291 4,023 179 203  Expected return on plan assets (9,576) (8,554) — —  Amortization of net loss 1,766 1,426 (48) 53  Net periodic benefit cost $ 574 $ 506 $ 178 $ 301   Six months ended June 30, 2017  Service cost $ 7,843 $ 6,876 $ 95 $ 74  Interest cost 8,414 9,011 359 409  Expected return on plan assets (18,326) (17,445) — —  Amortization of net loss 3,201 2,894 (96) 22  Net periodic benefit cost $ 1,132 $ 1,336 $ 358 $ 505  No contribution to the pension plans is required in 2017 to meet minimum funding requirements, and the Company has no plans to make a contribution in the current year.

Share-Based Payment Arrangement

Share-Based Payment Arrangements	6 Months Ended
	Jun. 30, 2017
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, 2016 . Effective January 1, 2017, the Company prospectively adopted accounting guidance intended to improve the accounting for employee share-based payments. The Company elected to account for forfeitures as they occur. The adoption of this guidance did not have a material impact on the Company’s financial condition or results of operations. A summary of option activity for the six months ended June 30 , 201 7 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, 2017 456,258 $ 35.91 $ 3,734  Exercised/Released (330,644) 34.56 4,065  Cancelled/Forfeited (538) 32.09 6  Expired (2,570) 64.74  Outstanding at June 30, 2017 122,506 $ 38.98 2.80 $ 1,507  Exercisable at June 30, 2017 122,506 $ 38.98 2.80 $ 1,507  The total intrins ic value of options exercised for the six months ended June 30, 2017 was $4.1 million. There was no total intrinsic value of options exercised for the six months ended June 30, 2016 . 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, 2017 and changes during the six months ended June 30, 2017 , is presented in the following table.    Weighted  Average  Number of Grant Date  Shares Fair Value  Nonvested at January 1, 2017 2,152,119 $ 32.15  Granted 61,099 42.09  Vested (201,137) 30.18  Forfeited (38,670) 32.37  Nonvested at June 30, 2017 1,973,411 $ 32.65  As of June 30, 2017 , there was $43.8 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, 2017 and 2016 was $10.0 million and $2.0 million , respectively. During the six months ended June 30, 2017 , the Company granted 23,489 performance shares subject to a total shareholder return (“TSR”) performance metric with a grant date fair value of $42.92 per share and 23,489 performance shares subject to a core earnings per share performance metric with a grant date fair value of $38.26 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, 2017
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, 2017  (in thousands) Level 1 Level 2 Level 3 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 74,840 $ — $ 74,840  Municipal obligations — 245,156 — 245,156  Corporate debt securities — 3,500 — 3,500  Residential mortgage-backed securities — 1,854,099 — 1,854,099  Commercial mortgage-backed securities — 433,098 — 433,098  Collateralized mortgage obligations — 183,689 — 183,689  Total available for sale securities — 2,794,382 — 2,794,382  Derivative assets (1) — 16,875 — 16,875  Total recurring fair value measurements - assets $ — $ 2,811,257 $ — $ 2,811,257  Liabilities  Derivative liabilities (1) $ — $ 12,213 $ — $ 12,213  Total recurring fair value measurements - liabilities $ — $ 12,213 $ — $ 12,213  (1) For further disaggregation of derivative as sets and liabilities, see Note 6 - Derivatives.      December 31, 2016  (in thousands) Level 1 Level 2 Level 3 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 54,828 $ — $ 54,828  Municipal obligations — 242,155 — 242,155  Corporate debt securities — 3,500 — 3,500  Residential mortgage-backed securities — 1,611,355 — 1,611,355  Commercial mortgage-backed securities — 402,591 — 402,591  Collateralized mortgage obligations — 202,479 — 202,479  Total available for sale securities — 2,516,908 — 2,516,908  Derivative assets (1) — 20,315 — 20,315  Total recurring fair value measurements - assets $ — $ 2,537,223 $ — $ 2,537,223  Liabilities  Derivative liabilities (1) $ — $ 27,432 $ — $ 27,432  Total recurring fair value measurements - liabilities $ — $ 27,432 $ — $ 27,432  (1) For further disaggregation of derivative as sets and liabilities, see Note 6 - Derivatives.  Securities classified as level 2 include obligations of U.S. Government agencies and U.S. Government-sponsored agencies, residential mortgage-backed securities and collateralized mortgage obligations that are issued or guaranteed by U.S. government agencies, and state and municipal bonds. The level 2 fair value measurements for investment securities are obtained quarterly from a third-party pricing service that uses industry-standard pricing models. Substantially all of the model inputs are observable in the marketplace or can be supported by observable data. The Company invests only in securities of investment grade quality with a targeted duration, for the overall portfolio, generally between two and five years . Company policies generally limit investments to U.S. 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, 2017  (in thousands) Level 1 Level 2 Level 3 Total  Collateral-dependent impaired loans $ — $ 137,653 $ — $ 137,653  Other real estate owned — — 8,447 8,447  Total nonrecurring fair value measurements $ — $ 137,653 $ 8,447 $ 146,100      December 31, 2016  (in thousands) Level 1 Level 2 Level 3 Total  Collateral-dependent impaired loans $ — $ 169,888 $ — $ 169,888  Other real estate owned — — 13,968 13,968  Total nonrecurring fair value measurements $ — $ 169,888 $ 13,968 $ 183,856  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 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, 2017 and December 31, 2016 .      June 30, 2017  Total Fair Carrying  (in thousands) Level 1 Level 2 Level 3 Value Amount  Financial assets:  Cash, interest-bearing bank deposits, and federal funds sold $ 491,653 $ — $ — $ 491,653 $ 491,653  Available for sale securities — 2,794,382 — 2,794,382 2,794,382  Held to maturity securities — 2,866,529 — 2,866,529 2,874,454  Loans, net — 137,653 17,954,752 18,092,405 18,251,976  Loans held for sale — 26,787 — 26,787 26,787  Derivative financial instruments — 16,875 — 16,875 16,875  Financial liabilities:  Deposits $ — $ — $ 21,432,877 $ 21,432,877 $ 21,442,815  Federal funds purchased 76,798 — — 76,798 76,798  Securities sold under agreements to repurchase 482,109 — — 482,109 482,109  FHLB short-term borrowings 1,252,000 — — 1,252,000 1,252,000  Long-term debt — 407,409 — 407,409 407,876  Derivative financial instruments — 12,213 — 12,213 12,213      December 31, 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 $ 450,866 $ — $ — $ 450,866 $ 450,866  Available for sale securities — 2,516,908 — 2,516,908 2,516,908  Held to maturity securities — 2,470,117 — 2,470,117 2,500,220  Loans, net — 169,888 16,326,961 16,496,849 16,522,733  Loans held for sale — 34,064 — 34,064 34,064  Derivative financial instruments — 20,315 — 20,315 20,315  Financial liabilities:  Deposits $ — $ — $ 19,430,939 $ 19,430,939 $ 19,424,266  Federal funds purchased 2,275 — — 2,275 2,275  Securities sold under agreements to repurchase 358,131 — — 358,131 358,131  FHLB short-term borrowings 865,000 — — 865,000 865,000  Long-term debt — 435,747 — 435,747 436,280  Derivative financial instruments — 27,432 — 27,432 27,432 

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2017
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	14 . Recent Accounting Pronouncements  Accounting Standards Adopted in 2017  In March 2017, the FASB issued Accounting Standards Update (“ ASU ”) 2017-08, “Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities,” which amends the amortization period for certain purchased callable debt securities held at a premium. The amendments require the premium to be amortized to the earliest call date. The amendments do not, however, require an accounting change for securities held at a discount; instead, the discount continues to be amortized to maturity. The amendments in this ASU more closely align the amortization period of premiums and discounts to expectations incorporated in market pricing on the underlying securities. These amendments are effective for fiscal years, and for interim period within those fiscal years, beginning after December 15, 2018. The Company early adopted this amendment and, in accordance with the standards, the Company began amortizing the premium for certain purchased callable debt securities to the earliest call date. The adoption of this guidance did not have a material impact on the Company’s financial condition or results of operations.  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 were effective for public business entities for annual periods beginning after December 15, 2016, and interim periods within those annual periods and we adopted the guidance effective January 1, 2017. In accordance with the standard, the Company elected to account for forfeitures of stock-based compensation as they occur and will now reclass dividends paid on forfeited shares to compensation expense from retained earnings. Classification of shares forfeited for taxes are reflected in the statement of cash flows as a financing rather than operating activity, with all historical periods restated. In addition, the Company began recognizing excess tax benefits and tax deficiencies during the period to income (rather than in equity) on a prospective basis. Our adoption of this guidance did not have a material impact on the Company’s financial condition or results of operations , however, the change in treatment of excess tax benefits and tax deficiencies could result in volatility of future earnings, depending on changes in the Company’s stock price .  Issued but Not Yet Adopted Accounting Standards  In May 2017, the FASB issued ASU 2017-09, “Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting,” which seeks to provide clarity, reduce diversity in practice, and reduce complexity when applying the guidance regarding a change to the terms of conditions of a share-based payment award. Specifically, an entity is to account for the effects of a modification, unless all of the following are satisfied: (1) the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the modified award is the same as the fair value (or calculated value or intrinsic value, if such an alternative measurement is used) of the original award immediately before the original award is modified; (2) the vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified; and (3) the classification of the modified award as an equity instrument or as a liability instrument is the same as the classification of the original award immediately before the original award is modified. The amendments are effective for annual periods, and for interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period, for reporting periods for which financial statements have not yet been issued. The Company is currently assessing this pronouncement and the impact of adoption, but it is not expected to have a material impact on the Company’s financial condition or results of operations.  In March 2017, the FASB issued ASU 2017-07, “Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost s, ” to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost. The amendments require that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. The amendments also allow only the service cost component to be eligible for capitalization when applicable. These amendments are effective for public business entities for annual periods beginning after December 15, 2017, including interim periods within those annual periods. Early adoption is permitted as of the beginning of an annual period for which financial statements (interim or annual) have not been issued or made available for issuance, meaning early adoption should be within the first interim period if an employer issues interim financial statements. Disclosures of the nature of and reason for the change in accounting principle are required in the first interim and annual periods of adoption. The amendments should be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement and prospectively, on and after the effective date, for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. The Company is currently assessing this pronouncement and the impact of adoption , but it is not expected to have a material impact on the Company’s financial condition or results of operations.  In January 2017, the FASB issued ASU 2017-04, “Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment,” which simplifies the manner in which an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Under the amendments in this ASU, an entity should (1) perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and (2) recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, with the understanding that the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, ASU No. 2017-04 removes the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails such qualitative test, to perform Step 2 of the goodwill impairment test. This ASU is effective for public business entities that are SEC filers for fiscal years beginning after December 15, 2019, and for interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The ASU should be applied using a prospective method. The Company is currently assessing this pronouncement and is considering early adoption, but it is not expected to have a material impact on the Company’s financial condition or results of operations.  In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805) – Clarifying the Definition of a Business,” which addresses stakeholders’ concerns that the current definition of a business is applied too broadly and analyzing transactions under the current definition is difficult and costly. Under the amended guidance, a transaction is initially subject to a screening process to determine whether a “set” (i.e. an integrated set of assets and activities) qualifies as a business. Under the screen, if substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or in a group of similar identifiable assets, the set is deemed not to be a business. Further evaluation is required only if the transferred set does not meet the screen. Under the further evaluation, to be considered a business, a set must include, at a minimum, an input and a substantive process that, together, significantly contribute to the ability to create output. The amendment also narrows the definition of the term “output” so that it is consistent with the manner in which outputs are described in Topic 606, Revenue from Contracts with Customers. The amendments are effective for annual periods beginning after December 15, 2017, including interim periods within those periods. Early application is permitted under certain circumstances. The amendments should be applied prospectively on or after the effective date. The Company is currently assessing this pronouncement and the impact of adoption on the Company’s financial condition and results of operations.  In October 2016, the FASB issued ASU No. 2016-16, “Income Taxes (Topic 740) – Intra-Entity Transfers of Assets Other than Inventory,” which addresses stakeholders’ concerns that the limited amount of authoritative guidance has led to diversity in practice and is a source of complexity in financial reporting and results in an unfaithful representation of the economics of an intra-entity asset transfer. The amendment eliminates the exception to the United States generally accepted accounting principle (“U.S. GAAP”) of comprehensive recognition of current and deferred income taxes that prohibits recognizing current and deferred income tax consequences for an intra-equity asset transfer (excluding the transfer of inventory) until the asset has been sold to an outside party. The amendments are effective for annual reporting periods beginning after December 15, 2017, including interim periods within those annual reporting periods. Early adoption is permitted, including adoption in an interim period. The amendments should be applied using a retrospective transition method to each period presented. The Company is currently assessing this pronouncement and the impact of adoption; however, the adoption of this guidance is not expected to have a material impact on the Company’s financial condition or results of operations.  In August 2016, the FASB issued ASU 2016-15, “Statement of Cash flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments,” to address diversity in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments provide guidance on eight specific cash flow issues, including debt prepayment or extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies (including bank-owned), life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. The amendments are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The amendments should be applied using a retrospective transition method to each period presented. This guidance is not expected to have a material impact on the Company’s financial condition or results of operations.  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 currently applied 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 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, with a cumulative-effect adjustment to retained earnings as of the beginning of the year of adoption. Early application is permitted for all organizations for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company has begun the process of implementation and currently is not planning to early adopt. The Company expects the guidance will result in an increase in the allowance for loan losses given the change from covering losses inherent in the portfolio to covering losses over the remaining expected life of the portfolio and the nonaccretable difference on purchased credit impaired loans moving to an allowance (offset by an increase in the carrying value of the related loans). The guidance will also result in the establishment of an allowance for credit loss on held to maturity debt securities. The amount of the increase in these allowances will be impacted by the portfolio composition and quality at the adoption date as well as economic conditions and forecasts at that time.  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 are required to 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 by reviewing its existing lease contracts and service contracts that may include embedded leases. The Company expects a gross-up of its Consolidated Balance Sheets as a result of recognizing lease liabilities and right of use assets; the extent of such is under evaluation. The Company does not expect material changes to the recognition of operating lease expense in its consolidated results of operations.  In January 2016, the FASB issued ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities,” that improves the recognition and measurement of financial instruments through targeted changes to existing GAAP. It requires equity investments (except those that are accounted for under the equity method of accounting or result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. It also requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The amendments in this update are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is currently assessing this pronouncement; however, the adoption of this guidance is not expected to have a material impact on the Company’s financial condition or results of operations. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” affecting any entity that enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards. The core principle of this standard is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Most revenue associated with financial instruments, including interest and loan origination fees, is outside the scope of the guidance. Gains and losses on investment securities, derivatives, and sales of financial instruments are also excluded from the scope. Subsequent to issuance of the revenue recognition guidance, the FASB has issued several updates that deferred by one year the effective date for revenue recognition guidance; clarified its guidance for performing the principal-versus-agent analysis; clarified guidance for identifying performance obligations allowing entities to ignore immaterial promised goods and services in the context of a contract with a customer and other clarifying guidance and technical corrections. 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 December 15, 2017. The Company is still in process of gathering an inventory and evaluating all contracts with customers and does not plan to early adopt the guidance. The Company plans to use the modified retrospective approach for reporting and make a cumulative effect adjustment to the beginning balance of retained earnings. The preliminary analysis suggests 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, 2017
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, ne cessary to present the Company’s financial condition, results of operations, changes in stockholders’ equity and cash flows for the interim periods presented. The Company has also evaluated all subsequent events for potential recognition and disclosure through the date of the filing of this Form 10-Q. Some financial information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) have been condensed or omitted in this Form 10-Q pursuant to Securities and Exchange Commission rules and regulations. These financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. 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. Select Stockholders’ Equity line items in the Consolidated Balance Sheets and Statements of Changes in Stockholders’ Equity have been modified to simplify the presentation as discussed in Note 7 – Stockholders’ Equity. Presentation of derivatives contracts cleared through a central clearing cou nterparty has been revised prospectively to reflect netting of variation margin as settlements to the derivative assets and liabilities rather than collateral, effective January 3, 2017, as discussed in Note 6 – Derivatives. These changes in presentation 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 during the reporting period 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, 2016.

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2017
Acquisitions [Abstract]
Schedule of Fair Value of Net Assets Acquired	  FNBC I FNBC II  (in thousands) March 10, 2017 April 28, 2017 Total  ASSETS  Cash and due from banks $ 2,856 $ 157,932 $ 160,788  Interest-bearing time deposits with other banks — 382,622 382,622  Fed funds sold and other short-term investments — 148 148  Securities — 213,877 213,877  Total loans 1,211,523 165,577 1,377,100  Property and equipment 11,837 500 12,337  Accrued interest receivable 2,969 885 3,854  Identifiable intangible assets 3,900 20,500 24,400  Other assets 63 4,097 4,160  Total identifiable assets 1,233,148 946,138 2,179,286   LIABILITIES  Deposits 398,171 1,530,338 1,928,509  Short-term borrowings 510,749 85,886 596,635  Long-term debt 93,120 — 93,120  Other liabilities 1,607 3,079 4,686  Total liabilities 1,003,647 1,619,303 2,622,950  Net identifiable assets acquired (liabilities assumed) 229,501 (673,165) (443,664)  Consideration  Cash (paid) received (325,564) 640,435 314,871  Unsettled net consideration receivable from FDIC — 9,721 9,721  Total consideration (325,564) 650,156 324,592  Goodwill $ 96,063 $ 23,009 $ 119,072 
Schedule of Goodwill	  Goodwill balance at December 31, 2016 $ 621,193  Additions:  Goodwill from FNBC I 96,063  Goodwill from FNBC II 23,009  Goodwill balance at June 30, 2017 $ 740,265 
Schedule of Merger-Related Expense	  (in thousands) Three months ended June 30, 2017 Six months ended June 30, 2017  Personnel expense $ 1,435 $ 1,542  Net occupancy and equipment expense 276 277  Professional services expense 2,200 6,827  Other real estate (1,511) (1,511)  Advertising expense 901 1,031  Other expense 713 2,311  Total merger-related expenses $ 4,014 $ 10,477 

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2017
Gain (Loss) on Investments [Line Items]
Amortized Cost and Fair Value of Securities Available for Sale	   Securities Available for Sale  (in thousands) June 30, 2017 December 31, 2016   Gross Gross Gross Gross  Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair  Cost Gains Losses Value Cost Gains Losses Value  U.S. Treasury and government agency securities $ 76,146 $ — $ 1,306 $ 74,840 $ 56,751 $ — $ 1,923 $ 54,828  Municipal obligations 250,598 499 5,941 245,156 253,228 113 11,186 242,155  Residential mortgage-backed securities 1,860,644 9,765 16,310 1,854,099 1,620,191 10,592 19,428 1,611,355  Commercial mortgage-backed securities 449,912 463 17,277 433,098 425,750 — 23,159 402,591  Collateralized mortgage obligations 183,987 254 552 183,689 202,580 490 591 202,479  Corporate debt securities 3,500 — — 3,500 3,500 — — 3,500  $ 2,824,787 $ 10,981 $ 41,386 $ 2,794,382 $ 2,562,000 $ 11,195 $ 56,287 $ 2,516,908 
Amortized Cost and Fair Value of Securities Held to Maturity	   Securities Held to Maturity  (in thousands) June 30, 2017 December 31, 2016  Gross Gross Gross Gross  Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair  Cost Gains Losses Value Cost Gains Losses Value  U.S. Treasury and government agency securities $ 50,000 $ — $ 64 $ 49,936 $ 50,000 $ — $ 44 $ 49,956  Municipal obligations 730,599 7,205 9,614 728,190 648,093 2,147 20,175 630,065  Residential mortgage-backed securities 796,190 7,402 1,315 802,277 862,162 4,329 3,068 863,423  Commercial mortgage-backed securities 75,705 — 2,637 73,068 75,739 — 4,038 71,701  Collateralized mortgage obligations 1,221,960 1,690 10,592 1,213,058 864,226 1,420 10,674 854,972  $ 2,874,454 $ 16,297 $ 24,222 $ 2,866,529 $ 2,500,220 $ 7,896 $ 37,999 $ 2,470,117 
Available for Sale [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	 Debt Securities Available for Sale Amortized Fair (in thousands) Cost Value Due in one year or less $ 7,945 $ 7,970 Due after one year through five years 38,273 38,767 Due after five years through ten years 997,109 980,311 Due after ten years 1,781,460 1,767,334 Total available for sale debt securities $ 2,824,787 $ 2,794,382 
Securities with Unrealized Losses	   Available for Sale  June 30, 2017 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 $ 74,308 1,306 $ — $ — $ 74,308 $ 1,306  Municipal obligations 213,557 5,941 — — 213,557 5,941  Residential mortgage-backed securities 1,315,878 16,245 2,539 65 1,318,417 16,310  Commercial mortgage-backed securities 407,937 17,277 — — 407,937 17,277  Collateralized mortgage obligations 74,282 552 — — 74,282 552  Equity securities — — — — — —  $ 2,085,962 $ 41,321 $ 2,539 $ 65 $ 2,088,501 $ 41,386       Available for Sale  December 31, 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  U.S. Treasury and government agency securities $ 54,788 $ 1,923 $ — $ — $ 54,788 $ 1,923  Municipal obligations 228,588 11,186 — — 228,588 11,186  Residential mortgage-backed securities 1,087,644 19,359 3,738 69 1,091,382 19,428  Commercial mortgage-backed securities 402,591 23,159 — — 402,591 23,159  Collateralized mortgage obligations 83,701 591 — — 83,701 591  Corporate debt securities — — — — —  $ 1,857,312 $ 56,218 $ 3,738 $ 69 $ 1,861,050 $ 56,287 
Held to Maturity [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	  Amortized Fair Debt Securities Held to Maturity Cost Value Due in one year or less $ 9,995 $ 10,058 Due after one year through five years 108,634 109,069 Due after five years through ten years 851,644 845,017 Due after ten years 1,904,181 1,902,385 Total held to maturity securities $ 2,874,454 $ 2,866,529 
Securities with Unrealized Losses	   Held to maturity  June 30, 2017 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 $ 49,936 $ 64 $ — $ — $ 49,936 $ 64  Municipal obligations 432,877 9,311 7,204 303 440,081 9,614  Residential mortgage-backed securities 268,110 1,315 — — 268,110 1,315  Commercial mortgage-backed securities 73,068 2,637 — — 73,068 2,637  Collateralized mortgage obligations 842,667 7,113 134,129 3,479 976,796 10,592  $ 1,666,658 $ 20,440 $ 141,333 $ 3,782 $ 1,807,991 $ 24,222      Held to maturity  December 31, 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  U.S. Treasury and government agency securities $ 49,956 $ 44 $ — $ — $ 49,956 $ 44  Municipal obligations 494,470 19,706 11,750 469 506,220 20,175  Residential mortgage-backed securities 278,369 3,068 — — 278,369 3,068  Commercial mortgage-backed securities 71,701 4,038 — — 71,701 4,038  Collateralized mortgage obligations 618,739 7,296 115,375 3,378 734,114 10,674  $ 1,513,235 $ 34,152 $ 127,125 $ 3,847 $ 1,640,360 $ 37,999 

Loans and Allowance for Loan 26

Loans and Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Net of Unearned Income	   June 30, December 31,  (in thousands) 2017 2016  Commercial non-real estate $ 8,093,104 $ 7,613,917  Commercial real estate - owner occupied 2,078,332 1,906,821  Total commercial & industrial 10,171,436 9,520,738  Commercial real estate - income producing 2,401,673 2,013,890  Construction and land development 1,313,522 1,010,879  Residential mortgages 2,493,923 2,146,713  Consumer 2,093,287 2,059,931  Total loans $ 18,473,841 $ 16,752,151 
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, 2017  Allowance for loan losses:  Beginning balance $ 147,052 $ 11,083 $ 158,135 $ 13,509 $ 6,271 $ 25,361 $ 26,142 $ 229,418  Purchased credit impaired activity:  Charge-offs — — — — (58) (86) (153) (297)  Recoveries 2 93 95 — 39 19 71 224  Net provision for loan losses (46) (245) (291) (61) (148) (10) (112) (622)  Decrease in FDIC loss share receivable (47) — (47) — — (2,344) (135) (2,526)  Non-purchased credit impaired activity:  Charge-offs (26,218) (517) (26,735) (160) (114) (690) (15,107) (42,806)  Recoveries 1,816 243 2,059 398 716 262 3,475 6,910  Net provision for loan losses 14,804 1,441 16,245 (146) 343 868 14,254 31,564  Ending balance $ 137,363 $ 12,098 $ 149,461 $ 13,540 $ 7,049 $ 23,380 $ 28,435 $ 221,865  Ending balance:  Allowance:  Individually evaluated for impairment $ 22,758 $ 280 $ 23,038 $ 1,402 $ 1 $ 172 $ 283 $ 24,896  Amounts related to purchased credit impaired loans 395 742 1,137 192 239 12,622 942 15,132  Collectively evaluated for impairment 114,210 11,076 125,286 11,946 6,809 10,586 27,210 181,837  Total allowance $ 137,363 $ 12,098 $ 149,461 $ 13,540 $ 7,049 $ 23,380 $ 28,435 $ 221,865  Loans:  Individually evaluated for impairment $ 250,256 $ 7,480 $ 257,736 $ 14,913 $ 847 $ 3,466 $ 1,053 $ 278,015  Purchased credit impaired loans 5,422 9,848 15,270 6,247 4,160 129,198 8,280 163,155  Collectively evaluated for impairment 7,837,426 2,061,004 9,898,430 2,380,513 1,308,515 2,361,259 2,083,954 18,032,671  Total loans $ 8,093,104 $ 2,078,332 $ 10,171,436 $ 2,401,673 $ 1,313,522 $ 2,493,923 $ 2,093,287 $ 18,473,841        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)  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  
Composition of Nonaccrual Loans by Portfolio Class	   June 30, December 31,  (in thousands) 2017 2016  Commercial non-real estate $ 167,710 $ 249,037  Commercial real estate - owner occupied 11,750 14,413  Total commercial & industrial 179,460 263,450  Commercial real estate - income producing 13,438 13,954  Construction and land development 2,821 4,550  Residential mortgages 28,158 23,665  Consumer 14,342 12,351  Total loans $ 238,219 $ 317,970 
Troubled Debt Restructurings Modified by Portfolio Class	   Six months ended  ($ in thousands) June 30, 2017 June 30, 2016  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 37 $ 92,976 $ 92,976 17 $ 57,915 $ 57,915  Commercial real estate - owner occupied 4 3,734 3,734 — — —  Total commercial & industrial 41 96,710 96,710 17 57,915 57,915  Commercial real estate - income producing 5 6,486 6,486 — — —  Construction and land development — — — — — —  Residential mortgages 6 1,098 1,098 4 432 432  Consumer 1 40 42 — — —  Total loans 53 $ 104,334 $ 104,336 21 $ 58,347 $ 58,347 
Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class	   June 30, 2017  Recorded investment Recorded investment Unpaid  (in thousands) without an allowance with an allowance principal balance Related allowance  Commercial non-real estate $ 107,555 $ 142,701 $ 260,544 $ 22,758  Commercial real estate - owner occupied 3,514 3,966 7,570 280  Total commercial & industrial 111,069 146,667 268,114 23,038  Commercial real estate - income producing 5,678 9,235 15,349 1,402  Construction and land development 831 16 1,820 1  Residential mortgages 2,338 1,128 3,984 172  Consumer 1 1,052 1,055 283  Total loans $ 119,917 $ 158,098 $ 290,322 $ 24,896    December 31, 2016  Recorded investment Recorded investment Unpaid  (in thousands) without an allowance with an allowance principal balance Related allowance  Commercial non-real estate $ 150,650 $ 120,612 $ 295,445 $ 28,187  Commercial real estate - owner occupied 4,261 2,007 6,646 246  Total commercial & industrial 154,911 122,619 302,091 28,433  Commercial real estate - income producing 10,447 4,929 15,708 466  Construction and land development 1,106 832 2,903 38  Residential mortgages 2,877 1,470 4,865 91  Consumer — 2,154 2,155 267  Total loans $ 169,341 $ 132,004 $ 327,722 $ 29,295  The tables below present the average balances and interest income for total impaired loans for the three and six months ended June 30, 2017 and 2016. Interest income recognized represents interest on accruing loans modified in a TDR.      Three months ended  June 30, 2017 June 30, 2016  Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 241,122 $ 597 $ 216,907 $ 493  Commercial real estate - owner occupied 5,687 18 5,959 14  Total commercial & industrial 246,809 615 222,866 507  Commercial real estate - income producing 14,257 34 8,242 22  Construction and land development 1,219 — 7,660 —  Residential mortgages 3,352 3 976 2  Consumer 1,601 3 112 1  Total loans $ 267,238 $ 655 $ 239,856 $ 532                    Six months ended  June 30, 2017 June 30, 2016  Average Interest Average Interest  recorded income recorded income  (in thousands) investment recognized investment recognized  Commercial non-real estate $ 246,374 $ 934 $ 179,117 $ 847  Commercial real estate - owner occupied 5,384 22 5,836 29  Total commercial & industrial 251,758 956 184,953 876  Commercial real estate - income producing 14,372 77 9,072 43  Construction and land development 1,492 — 10,905 —  Residential mortgages 3,572 5 932 4  Consumer 1,876 5 109 2  Total loans $ 273,070 $ 1,043 $ 205,971 $ 925 
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, 2017 past due past due past due past due Current Loans still accruing  (in thousands)  Commercial non-real estate $ 27,751 $ 27,974 $ 91,987 $ 147,712 $ 7,945,392 $ 8,093,104 $ 13,088  Commercial real estate - owner occupied 4,532 1,189 6,321 12,042 2,066,290 2,078,332 424  Total commercial & industrial 32,283 29,163 98,308 159,754 10,011,682 10,171,436 13,512  Commercial real estate - income producing 3,369 2,319 5,040 10,728 2,390,945 2,401,673 1,989  Construction and land development 6,250 619 1,980 8,849 1,304,673 1,313,522 —  Residential mortgages 25,433 12,208 22,088 59,729 2,434,194 2,493,923 2,801  Consumer 15,764 5,843 7,600 29,207 2,064,080 2,093,287 88  Total $ 83,099 $ 50,152 $ 135,016 $ 268,267 $ 18,205,574 $ 18,473,841 $ 18,390      Recorded  Greater than investment  30-59 days 60-89 days 90 days Total Total > 90 days and  December 31, 2016 past due past due past due past due Current Loans still accruing  (in thousands)  Commercial non-real estate $ 19,722 $ 1,909 $ 68,505 $ 90,136 $ 7,523,781 $ 7,613,917 $ 384  Commercial real estate - owner occupied 3,008 581 6,310 9,899 1,896,922 1,906,821 52  Total commercial & industrial 22,730 2,490 74,815 100,035 9,420,703 9,520,738 436  Commercial real estate - income producing 838 50 5,026 5,914 2,007,976 2,013,890 216  Construction and land development 694 171 5,300 6,165 1,004,714 1,010,879 1,563  Residential mortgages 24,599 8,816 14,369 47,784 2,098,929 2,146,713 1  Consumer 18,621 7,441 9,147 35,209 2,024,722 2,059,931 823  Total $ 67,482 $ 18,968 $ 108,657 $ 195,107 $ 16,557,044 $ 16,752,151 $ 3,039 
Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield	   June 30, 2017 December 31, 2016  Carrying Carrying  Amount Accretable Amount Accretable  (in thousands) of Loans Yield of Loans Yield  Balance at beginning of period $ 190,915 $ 113,686 $ 225,838 $ 129,488  Payments received, net (36,950) (6,258) (55,194) (11,024)  Accretion 9,190 (9,190) 20,271 (20,271)  Increase in expected cash flows based on actual cash flows and changes in cash flow assumptions — 4,405 — 5,358  Net transfers from nonaccretable difference to accretable yield — 5,183 — 10,135  Balance at end of period $ 163,155 $ 107,826 $ 190,915 $ 113,686 
Activity in Loss Share Receivable	    June 30, June 30,  (in thousands) 2017 2016  Beginning Balance $ 16,219 $ 29,868  Amortization (2,427) (3,139)  Charge-offs, write-downs and other recoveries (2,442) (2,683)  External expenses qualifying under loss share agreement 79 307  Adjustment due to changes in cash flow projections (2,526) (3,437)  Net payments to FDIC 934 159  Write-down for termination of loss share agreement (6,603) —  Ending balance $ 3,234 $ 21,075 
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit Quality Indicators by Segments and Portfolio Class	   June 30, 2017  (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 $ 6,897,989 $ 1,859,185 $ 8,757,174 $ 2,214,329 $ 1,233,082 $ 12,204,585  Pass-Watch 298,254 55,146 353,400 117,247 58,024 528,671  Special Mention 215,373 43,219 258,592 13,840 7,591 280,023  Substandard 678,032 120,782 798,814 56,247 14,825 869,886  Doubtful 3,456 — 3,456 10 — 3,466  Loss — — — — — —  Total $ 8,093,104 $ 2,078,332 $ 10,171,436 $ 2,401,673 $ 1,313,522 $ 13,886,631   December 31, 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 $ 6,364,348 $ 1,719,114 $ 8,083,462 $ 1,873,644 $ 968,505 $ 10,925,611  Pass-Watch 203,311 47,676 250,987 78,309 22,592 351,888  Special Mention 181,763 40,299 222,062 22,492 4,142 248,696  Substandard 846,793 99,732 946,525 39,434 15,640 1,001,599  Doubtful 17,702 — 17,702 11 — 17,713  Loss — — — — — —  Total $ 7,613,917 $ 1,906,821 $ 9,520,738 $ 2,013,890 $ 1,010,879 $ 12,545,507 
Residential Mortgage and Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit Quality Indicators by Segments and Portfolio Class	   June 30, 2017 December 31, 2016  (in thousands) Residential mortgage Consumer Total Residential mortgage Consumer Total  Performing $ 2,462,964 $ 2,078,857 $ 4,541,821 $ 2,123,048 $ 2,046,757 $ 4,169,805  Nonperforming 30,959 14,430 45,389 23,665 13,174 36,839  Total $ 2,493,923 $ 2,093,287 $ 4,587,210 $ 2,146,713 $ 2,059,931 $ 4,206,644 

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
	Jun. 30, 2017
Derivatives [Abstract]
Fair Values of Derivative Financial Instruments	     June 30, 2017 December 31, 2016  Derivative (1) Derivative (1)  (in thousands) Type of Hedge Notional or Contractual Amount Assets Liabilities Notional or Contractual Amount Assets Liabilities  Derivatives designated as hedging instruments:  Interest rate swaps Cash Flow $ 750,000 $ 18 $ 7,619 $ 1,100,000 $ — $ 7,787  Interest rate swaps Fair Value 363,000 — 518 — — —  $ 1,113,000 $ 18 $ 8,137 $ 1,100,000 $ — $ 7,787  Derivatives not designated as hedging instruments:  Interest rate swaps (2) N/A $ 1,130,367 $ 17,536 $ 18,011 $ 979,391 $ 18,405 $ 18,362  Risk participation agreements N/A 111,667 39 117 84,732 50 105  Forward commitments to sell residential mortgage loans N/A 87,204 7 825 75,676 900 221  Interest rate-lock commitments on residential mortgage loans N/A 66,483 563 5 46,840 189 228  Foreign exchange forward contracts N/A 56,016 1,606 1,562 56,152 771 729  1,451,737 19,751 20,520 1,242,791 20,315 19,645  Total derivatives $ 2,564,737 $ 19,769 $ 28,657 $ 2,342,791 $ 20,315 $ 27,432  Less: netting adjustment (3) (2,894) (16,444) — —  Total derivative assets/liabilities $ 16,875 $ 12,213 $ 20,315 $ 27,432 (1) Derivative assets and liabilities are reported at fair value in 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.  (3) Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information. 
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, 2017  Derivative Assets $ 5,308 $ (3,963) $ 1,345 $ 1,345 $ — $ —   Derivative Liabilities $ 22,155 $ (16,392) $ 5,763 $ 1,345 $ 7,099 $ (2,681)      (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, 2016  Derivative Assets $ 4,788 $ — $ 4,788 $ 4,788 $ — $ —   Derivative Liabilities $ 26,846 $ — $ 26,846 $ 4,788 $ 19,095 $ 2,963 

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2017
Stockholders' Equity [Abstract]
Components of Accumulated Other Comprehensive Income (Loss)	   Available HTM Securities  for Sale Transferred Employee Cash  (in thousands) Securities from AFS Benefit Plans Flow Hedges Total  Balance, December 31, 2015 $ 4,268 $ (16,795) $ (67,890) $ (178) $ (80,595)  Other comprehensive income (loss) before income taxes:  Net change in unrealized gain 41,990 — — 3,611 45,601  Reclassification of net (gain) loss 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)  Balance, December 31, 2016 $ (28,679) $ (14,392) $ (72,501) $ (4,960) $ (120,532)  Other comprehensive income (loss) before income taxes:  Net change in unrealized gain (loss) 14,687 — — (842) 13,845  Reclassification of net losses realized and included in earnings — — 3,105 — 3,105  Valuation adjustment for pension plan amendment (a) — — 17,315 — 17,315  Other valuation adjustments for employee benefit plan — — (10,782) — (10,782)  Amortization of unrealized net loss on securities transferred to HTM — 1,749 — — 1,749  Income tax expense (benefit) 5,333 657 3,458 (309) 9,139  Balance, June 30, 2017 $ (19,325) $ (13,300) $ (66,321) $ (5,493) $ (104,439)  (a) For further discussion on the pension plan amendment, see Note 11 – Retirement Plans.
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) 2017 2016 the income statement  Gain on sale of AFS securities $ — $ 1,114 Securities transactions  Tax effect — (390) Income taxes  Net of tax — 724 Net income  Amortization of unrealized net loss on securities transferred to HTM (1,749) (1,628) Interest income  Tax effect 657 625 Income taxes  Net of tax (1,092) (1,003) Net income  Amortization of defined benefit pension and post-retirement items (3,105) (2,916) Employee benefits expense (b)  Tax effect 1,114 1,066 Income taxes  Net of tax (1,991) (1,850) Net income  Total reclassifications, net of tax $ (3,083) $ (2,129) Net income  (a) Amounts in parenthesis indicate reduction in net income.  (b) These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employ ee benefits expense (see Note 11 – Retirement Plans for additional details).

Other Noninterest Income (Table

Other Noninterest Income (Tables)	6 Months Ended
	Jun. 30, 2017
Other Noninterest Income [Abstract]
Components of Other Noninterest Income	   Three months e nded Six months ended  June 30, June 30,  (in thousands) 2017 2016 2017 2016  Income from bank-owned life insurance $ 2,883 $ 4,501 $ 5,535 $ 7,051  Credit related fees 2,898 2,267 5,776 4,624  Derivative income 2,680 533 3,145 394  Net (loss) gain on sale of assets (60) 1,801 4,065 3,566  Safety deposit box income 391 413 840 891  Other miscellaneous 4,082 2,041 6,388 4,376  Total other noninterest income $ 12,874 $ 11,556 $ 25,749 $ 20,902 

Other Noninterest Expense (Tabl

Other Noninterest Expense (Tables)	6 Months Ended
	Jun. 30, 2017
Other Noninterest Expense [Abstract]
Components of Other Noninterest Expense	   Three months ended Six months ended  June 30, June 30,  (in thousands) 2017 2016 2017 2016  Advertising $ 4,984 $ 2,693 $ 8,061 $ 5,050  Ad valorem and franchise taxes 3,519 2,340 6,555 4,643  Printing and supplies 1,330 1,065 2,508 2,176  Insurance expense 807 829 1,624 1,664  Travel expense 1,350 1,079 2,409 2,028  Entertainment and contributions 1,982 2,001 3,765 3,633  Tax credit investment amortization 1,213 1,833 2,425 3,576  Write-down for termination of FDIC loss share agreement 6,603 — 6,603 —  Other miscellaneous 5,879 4,633 12,347 10,412  Total other noninterest expense $ 27,667 $ 16,473 $ 46,297 $ 33,182 

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
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) 2017 2016 2017 2016  Numerator:  Net income to common shareholders $ 52,267 $ 46,907 $ 101,281 $ 50,746  Net income allocated to participating securities - basic and diluted 1,166 1,136 2,322 1,233  Net income allocated to common shareholders - basic and diluted $ 51,101 $ 45,771 $ 98,959 $ 49,513  Denominator:  Weighted-average common shares - basic $ 84,614 $ 77,523 $ 84,489 $ 77,512  Dilutive potential common shares 253 157 266 164  Weighted-average common shares - diluted $ 84,867 $ 77,680 $ 84,755 $ 77,676  Earnings per common share:  Basic $ 0.60 $ 0.59 $ 1.17 $ 0.64  Diluted $ 0.60 $ 0.59 $ 1.17 $ 0.64 

Retirement Plans (Tables)

Retirement Plans (Tables)	6 Months Ended
	Jun. 30, 2017
Retirement Plans [Abstract]
Components of Net Periodic Benefits Cost	   Other Post-  (in thousands) Pension Benefits retirement Benefits  Three months ended June 30, 2017 2016 2017 2016  Service cost $ 4,093 $ 3,611 $ 47 $ 45  Interest cost 4,291 4,023 179 203  Expected return on plan assets (9,576) (8,554) — —  Amortization of net loss 1,766 1,426 (48) 53  Net periodic benefit cost $ 574 $ 506 $ 178 $ 301   Six months ended June 30, 2017  Service cost $ 7,843 $ 6,876 $ 95 $ 74  Interest cost 8,414 9,011 359 409  Expected return on plan assets (18,326) (17,445) — —  Amortization of net loss 3,201 2,894 (96) 22  Net periodic benefit cost $ 1,132 $ 1,336 $ 358 $ 505 

Share-Based Payment Arrangeme33

Share-Based Payment Arrangements (Tables)	6 Months Ended
	Jun. 30, 2017
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, 2017 456,258 $ 35.91 $ 3,734  Exercised/Released (330,644) 34.56 4,065  Cancelled/Forfeited (538) 32.09 6  Expired (2,570) 64.74  Outstanding at June 30, 2017 122,506 $ 38.98 2.80 $ 1,507  Exercisable at June 30, 2017 122,506 $ 38.98 2.80 $ 1,507 
Summary of Nonvested Restricted and Performance Shares	   Weighted  Average  Number of Grant Date  Shares Fair Value  Nonvested at January 1, 2017 2,152,119 $ 32.15  Granted 61,099 42.09  Vested (201,137) 30.18  Forfeited (38,670) 32.37  Nonvested at June 30, 2017 1,973,411 $ 32.65 

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	   June 30, 2017  (in thousands) Level 1 Level 2 Level 3 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 74,840 $ — $ 74,840  Municipal obligations — 245,156 — 245,156  Corporate debt securities — 3,500 — 3,500  Residential mortgage-backed securities — 1,854,099 — 1,854,099  Commercial mortgage-backed securities — 433,098 — 433,098  Collateralized mortgage obligations — 183,689 — 183,689  Total available for sale securities — 2,794,382 — 2,794,382  Derivative assets (1) — 16,875 — 16,875  Total recurring fair value measurements - assets $ — $ 2,811,257 $ — $ 2,811,257  Liabilities  Derivative liabilities (1) $ — $ 12,213 $ — $ 12,213  Total recurring fair value measurements - liabilities $ — $ 12,213 $ — $ 12,213  (1) For further disaggregation of derivative as sets and liabilities, see Note 6 - Derivatives.      December 31, 2016  (in thousands) Level 1 Level 2 Level 3 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 54,828 $ — $ 54,828  Municipal obligations — 242,155 — 242,155  Corporate debt securities — 3,500 — 3,500  Residential mortgage-backed securities — 1,611,355 — 1,611,355  Commercial mortgage-backed securities — 402,591 — 402,591  Collateralized mortgage obligations — 202,479 — 202,479  Total available for sale securities — 2,516,908 — 2,516,908  Derivative assets (1) — 20,315 — 20,315  Total recurring fair value measurements - assets $ — $ 2,537,223 $ — $ 2,537,223  Liabilities  Derivative liabilities (1) $ — $ 27,432 $ — $ 27,432  Total recurring fair value measurements - liabilities $ — $ 27,432 $ — $ 27,432  (1) For further disaggregation of derivative as sets and liabilities, see Note 6 - Derivatives.
Financial Assets Measured at Fair Value on Nonrecurring Basis	   June 30, 2017  (in thousands) Level 1 Level 2 Level 3 Total  Collateral-dependent impaired loans $ — $ 137,653 $ — $ 137,653  Other real estate owned — — 8,447 8,447  Total nonrecurring fair value measurements $ — $ 137,653 $ 8,447 $ 146,100      December 31, 2016  (in thousands) Level 1 Level 2 Level 3 Total  Collateral-dependent impaired loans $ — $ 169,888 $ — $ 169,888  Other real estate owned — — 13,968 13,968  Total nonrecurring fair value measurements $ — $ 169,888 $ 13,968 $ 183,856 
Estimated Fair Values of Financial Instruments	   June 30, 2017  Total Fair Carrying  (in thousands) Level 1 Level 2 Level 3 Value Amount  Financial assets:  Cash, interest-bearing bank deposits, and federal funds sold $ 491,653 $ — $ — $ 491,653 $ 491,653  Available for sale securities — 2,794,382 — 2,794,382 2,794,382  Held to maturity securities — 2,866,529 — 2,866,529 2,874,454  Loans, net — 137,653 17,954,752 18,092,405 18,251,976  Loans held for sale — 26,787 — 26,787 26,787  Derivative financial instruments — 16,875 — 16,875 16,875  Financial liabilities:  Deposits $ — $ — $ 21,432,877 $ 21,432,877 $ 21,442,815  Federal funds purchased 76,798 — — 76,798 76,798  Securities sold under agreements to repurchase 482,109 — — 482,109 482,109  FHLB short-term borrowings 1,252,000 — — 1,252,000 1,252,000  Long-term debt — 407,409 — 407,409 407,876  Derivative financial instruments — 12,213 — 12,213 12,213      December 31, 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 $ 450,866 $ — $ — $ 450,866 $ 450,866  Available for sale securities — 2,516,908 — 2,516,908 2,516,908  Held to maturity securities — 2,470,117 — 2,470,117 2,500,220  Loans, net — 169,888 16,326,961 16,496,849 16,522,733  Loans held for sale — 34,064 — 34,064 34,064  Derivative financial instruments — 20,315 — 20,315 20,315  Financial liabilities:  Deposits $ — $ — $ 19,430,939 $ 19,430,939 $ 19,424,266  Federal funds purchased 2,275 — — 2,275 2,275  Securities sold under agreements to repurchase 358,131 — — 358,131 358,131  FHLB short-term borrowings 865,000 — — 865,000 865,000  Long-term debt — 435,747 — 435,747 436,280  Derivative financial instruments — 27,432 — 27,432 27,432 

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details)	Apr. 28, 2017USD ($)entity	Mar. 10, 2017USD ($)entity	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Business Acquisition [Line Items]
Short-term borrowings			$ 1,810,907,000		$ 1,810,907,000		$ 1,225,406,000
Long-term borrowings			407,876,000		407,876,000		436,280,000
Goodwill			740,265,000		740,265,000		621,193,000
Revenue			199,717,000	$ 164,969,000	381,408,000	$ 327,805,000
Professional Fees			10,353,000	7,712,000	21,629,000	15,333,000
Other expense			27,667,000	16,473,000	46,297,000	33,182,000
Loan expected to be uncollectible			221,865,000	$ 226,086,000	221,865,000	$ 226,086,000	$ 229,418,000	$ 181,179,000
Whitney Bank [Member]
Business Acquisition [Line Items]
Number of branches | entity		9
Net of cash acquired		$ 323,000,000
Cash consideration		326,000,000
Cash acquired		3,000,000
Acquisition, Premium amount to pay		41,600,000
FNBC Transaction [Member]
Business Acquisition [Line Items]
Acquisition, debt assumed			93,120,000		93,120,000
Identifiable intangible assets			24,400,000		24,400,000
Goodwill			119,072,000		119,072,000
Fair value discount					57,500,000
Acquisition, debt assumed			4,686,000		4,686,000
Total Loans			1,377,100,000		1,377,100,000
Unpaid principal balance of the loans acquired			1,400,000,000		1,400,000,000
Liabilities assumed			2,622,950,000		2,622,950,000
Estimated uncollectible amount			47,600,000		$ 47,600,000
FNBC I [Member]
Business Acquisition [Line Items]
Acquisition, debt assumed		93,120,000
Identifiable intangible assets		3,900,000
Goodwill		96,063,000
Acquisition, debt assumed		1,607,000
Goodwill adjustment			495,000
Total Loans		1,211,523,000
Useful life					8 years
Liabilities assumed		1,003,647,000
FNBC I [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Liabilities assumed		$ 604,000,000
FNBC I [Member] | Variable-rate Term Notes [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Short-term borrowings			460,000,000		$ 460,000,000
FNBC I [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Short-term borrowings			51,000,000		$ 51,000,000
Maturity year					2,017
Long-term borrowings			93,100,000		$ 93,100,000
FNBC I [Member] | $200 Debt Due 2025 [Member] | Variable-rate Term Notes [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Short-term borrowings			200,000,000		$ 200,000,000
Maturity year					2,025
FNBC I [Member] | $260 Debt Due 2026 [Member] | Variable-rate Term Notes [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Short-term borrowings			260,000,000		$ 260,000,000
Maturity year					2,026
FNBC I [Member] | $88 Debt Due 2018 [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Maturity year					2,018
Long-term borrowings			88,000,000		$ 88,000,000
FNBC I [Member] | $3.2 Debt Due 2019 [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Maturity year					2,019
Long-term borrowings			3,200,000		$ 3,200,000
FNBC I [Member] | $1.9 Debt Due 2023 [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Maturity year					2,023
Long-term borrowings			$ 1,900,000		$ 1,900,000
FNBC II [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 20,500,000
Goodwill	23,009,000
Acquisition, debt assumed	3,079,000
Total Loans	165,577,000
Useful life					9 years
Liabilities assumed	$ 1,619,303,000
FNBC II [Member] | Whitney Bank [Member]
Business Acquisition [Line Items]
Number of branches | entity	29
Cash received	$ 798,000,000
Cash acquired	158,000,000
Premium payment	35,000,000
Unpaid principal balance of the loans acquired	$ 640,000,000
FNBC II [Member] | Louisiana [Member] | Whitney Bank [Member]
Business Acquisition [Line Items]
Number of branches | entity	24
FNBC II [Member] | Florida [Member] | Whitney Bank [Member]
Business Acquisition [Line Items]
Number of branches | entity	5

Acquisitions (Schedule of Fair

Acquisitions (Schedule of Fair Value of Net Assets Acquired) (Details) - USD ($) $ in Thousands	Apr. 28, 2017	Mar. 10, 2017	Jun. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill			$ 740,265	$ 621,193
FNBC Transaction [Member]
Business Acquisition [Line Items]
Cash and due from banks			160,788
Interest-bearing time deposits with other banks			382,622
Fed funds sold and other short-term investments			148
Securities			213,877
Total Loans			1,377,100
Property and equipment			12,337
Accrued interest receivable			3,854
Identifiable intangible assets			24,400
Other assets			4,160
Total identifiable assets			2,179,286
Deposits			1,928,509
Short-term borrowings			596,635
Long-term debt			93,120
Other liabilities			4,686
Total liabilities			2,622,950
Net identifiable assets acquired (liabilities assumed)			(443,664)
Cash (paid) received			314,871
Unsettled net consideration receivable from FDIC			9,721
Total consideration			324,592
Goodwill			$ 119,072
FNBC I [Member]
Business Acquisition [Line Items]
Cash and due from banks		$ 2,856
Total Loans		1,211,523
Property and equipment		11,837
Accrued interest receivable		2,969
Identifiable intangible assets		3,900
Other assets		63
Total identifiable assets		1,233,148
Deposits		398,171
Short-term borrowings		510,749
Long-term debt		93,120
Other liabilities		1,607
Total liabilities		1,003,647
Net identifiable assets acquired (liabilities assumed)		229,501
Cash (paid) received		(325,564)
Total consideration		(325,564)
Goodwill		$ 96,063
FNBC II [Member]
Business Acquisition [Line Items]
Cash and due from banks	$ 157,932
Interest-bearing time deposits with other banks	382,622
Fed funds sold and other short-term investments	148
Securities	213,877
Total Loans	165,577
Property and equipment	500
Accrued interest receivable	885
Identifiable intangible assets	20,500
Other assets	4,097
Total identifiable assets	946,138
Deposits	1,530,338
Short-term borrowings	85,886
Other liabilities	3,079
Total liabilities	1,619,303
Net identifiable assets acquired (liabilities assumed)	(673,165)
Cash (paid) received	640,435
Unsettled net consideration receivable from FDIC	9,721
Total consideration	650,156
Goodwill	$ 23,009

Acquisitions (Schedule of Goodw

Acquisitions (Schedule of Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
FNBC Transaction [Member]
Business Acquisition [Line Items]
Goodwill, Balance	$ 621,193
Goodwill, Balance	740,265
FNBC I [Member]
Business Acquisition [Line Items]
Goodiwll, Additions	96,063
FNBC II [Member]
Business Acquisition [Line Items]
Goodiwll, Additions	$ 23,009

Acquisitions (Schedule of Merge

Acquisitions (Schedule of Merger-Related Expense) (Details) - FNBC Transaction [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Personnel expense	$ 1,435	$ 1,542
Net occupancy and equipment expense	276	277
Professional services expense	2,200	6,827
Other real estate	(1,511)	(1,511)
Advertising expense	901	1,031
Other expense	713	2,311
Total merger-related expenses	$ 4,014	$ 10,477

Securities (Narrative) (Details

Securities (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Securities [Abstract]
Securities classified as trading	$ 0		$ 0
Proceeds from sales of securities available for sale	213,877	$ 102,335
Realized gain	1,100	$ 1,100
Securities pledged as collateral	$ 3,800,000		$ 3,800,000

Securities (Amortized Cost and

Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	$ 2,824,787	$ 2,562,000
Securities Available for Sale, Gross Unrealized Gains	10,981	11,195
Securities Available for Sale, Gross Unrealized Losses	41,386	56,287
Securities Available for Sale, Fair Value	2,794,382	2,516,908
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	76,146	56,751
Securities Available for Sale, Gross Unrealized Losses	1,306	1,923
Securities Available for Sale, Fair Value	74,840	54,828
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	250,598	253,228
Securities Available for Sale, Gross Unrealized Gains	499	113
Securities Available for Sale, Gross Unrealized Losses	5,941	11,186
Securities Available for Sale, Fair Value	245,156	242,155
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	1,860,644	1,620,191
Securities Available for Sale, Gross Unrealized Gains	9,765	10,592
Securities Available for Sale, Gross Unrealized Losses	16,310	19,428
Securities Available for Sale, Fair Value	1,854,099	1,611,355
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	449,912	425,750
Securities Available for Sale, Gross Unrealized Gains	463
Securities Available for Sale, Gross Unrealized Losses	17,277	23,159
Securities Available for Sale, Fair Value	433,098	402,591
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	183,987	202,580
Securities Available for Sale, Gross Unrealized Gains	254	490
Securities Available for Sale, Gross Unrealized Losses	552	591
Securities Available for Sale, Fair Value	183,689	202,479
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

Securities (Amortized Cost an41

Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	$ 2,874,454	$ 2,500,220
Securities Held to Maturity, Gross Unrealized Gains	16,297	7,896
Securities Held to Maturity, Gross Unrealized Losses	24,222	37,999
Securities Held to Maturity, Fair Value	2,866,529	2,470,117
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	50,000	50,000
Securities Held to Maturity, Gross Unrealized Losses	64	44
Securities Held to Maturity, Fair Value	49,936	49,956
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	730,599	648,093
Securities Held to Maturity, Gross Unrealized Gains	7,205	2,147
Securities Held to Maturity, Gross Unrealized Losses	9,614	20,175
Securities Held to Maturity, Fair Value	728,190	630,065
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	796,190	862,162
Securities Held to Maturity, Gross Unrealized Gains	7,402	4,329
Securities Held to Maturity, Gross Unrealized Losses	1,315	3,068
Securities Held to Maturity, Fair Value	802,277	863,423
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	75,705	75,739
Securities Held to Maturity, Gross Unrealized Losses	2,637	4,038
Securities Held to Maturity, Fair Value	73,068	71,701
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	1,221,960	864,226
Securities Held to Maturity, Gross Unrealized Gains	1,690	1,420
Securities Held to Maturity, Gross Unrealized Losses	10,592	10,674
Securities Held to Maturity, Fair Value	$ 1,213,058	$ 854,972

Securities (Amortized Cost an42

Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Securities [Abstract]
Debt Securities Available for Sale, Due in one year or less, Amortized Cost	$ 7,945
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost	38,273
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost	997,109
Debt Securities Available for Sale, Due after ten years, Amortized Cost	1,781,460
Total available for sale debt securities, Amortized Cost	2,824,787
Debt Securities Available for Sale, Due in one year or less, Fair Value	7,970
Debt Securities Available for Sale, Due after one year through five years, Fair Value	38,767
Debt Securities Available for Sale, Due after five years through ten years, Fair Value	980,311
Debt Securities Available for Sale, Due after ten years, Fair Value	1,767,334
Total available for sale debt securities, Fair Value	2,794,382
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost	9,995
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost	108,634
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost	851,644
Debt Securities Held to Maturity, Due after ten years, Amortized Cost	1,904,181
Securities Held to Maturity, Amortized Cost	2,874,454	$ 2,500,220
Debt Securities Held to Maturity, Due in one year or less, Fair Value	10,058
Debt Securities Held to Maturity, Due after one year through five years, Fair Value	109,069
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value	845,017
Debt Securities Held to Maturity, Due after ten years, Fair Value	1,902,385
Total held to maturity securities, Fair Value	$ 2,866,529	$ 2,470,117

Securities (Securities Availabl

Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	$ 2,085,962	$ 1,857,312
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	41,321	56,218
Available for Sale, Losses 12 months or longer, Fair Value	2,539	3,738
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	65	69
Available for Sale, Total, Fair Value	2,088,501	1,861,050
Available for Sale, Total, Gross Unrealized Losses	41,386	56,287
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	74,308	54,788
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	1,306	1,923
Available for Sale, Total, Fair Value	74,308	54,788
Available for Sale, Total, Gross Unrealized Losses	1,306	1,923
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	213,557	228,588
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	5,941	11,186
Available for Sale, Total, Fair Value	213,557	228,588
Available for Sale, Total, Gross Unrealized Losses	5,941	11,186
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	1,315,878	1,087,644
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	16,245	19,359
Available for Sale, Losses 12 months or longer, Fair Value	2,539	3,738
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	65	69
Available for Sale, Total, Fair Value	1,318,417	1,091,382
Available for Sale, Total, Gross Unrealized Losses	16,310	19,428
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	407,937	402,591
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	17,277	23,159
Available for Sale, Total, Fair Value	407,937	402,591
Available for Sale, Total, Gross Unrealized Losses	17,277	23,159
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	74,282	83,701
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	552	591
Available for Sale, Total, Fair Value	74,282	83,701
Available for Sale, Total, Gross Unrealized Losses	$ 552	$ 591

Securities (Securities Held to

Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	$ 1,666,658	$ 1,513,235
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	20,440	34,152
Held to maturity, Losses 12 months or longer, Fair Value	141,333	127,125
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	3,782	3,847
Held to maturity, Total, Fair Value	1,807,991	1,640,360
Held to maturity, Total, Gross Unrealized Losses	24,222	37,999
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	49,936	49,956
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	64	44
Held to maturity, Total, Fair Value	49,936	49,956
Held to maturity, Total, Gross Unrealized Losses	64	44
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	432,877	494,470
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	9,311	19,706
Held to maturity, Losses 12 months or longer, Fair Value	7,204	11,750
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	303	469
Held to maturity, Total, Fair Value	440,081	506,220
Held to maturity, Total, Gross Unrealized Losses	9,614	20,175
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	268,110	278,369
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	1,315	3,068
Held to maturity, Total, Fair Value	268,110	278,369
Held to maturity, Total, Gross Unrealized Losses	1,315	3,068
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	73,068	71,701
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	2,637	4,038
Held to maturity, Total, Fair Value	73,068	71,701
Held to maturity, Total, Gross Unrealized Losses	2,637	4,038
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	842,667	618,739
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	7,113	7,296
Held to maturity, Losses 12 months or longer, Fair Value	134,129	115,375
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	3,479	3,378
Held to maturity, Total, Fair Value	976,796	734,114
Held to maturity, Total, Gross Unrealized Losses	$ 10,592	$ 10,674

Loans and Allowance for Loan 45

Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2017USD ($)contractagreement	Jun. 30, 2016USD ($)contract	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 238,219	$ 238,219		$ 317,970
TDRs both accruing and nonaccruing	186,800	186,800		121,700
Post-Modification outstanding recorded investment		$ 104,336	$ 58,347
Number of TDRs subsequently defaulted | contract		0	0
TDRs and loans impaired with minimum aggregate relationship balances		$ 1,000
Loans receivable	18,473,841	18,473,841	$ 16,035,796	16,752,151
Loans receivable	154,000	154,000
Real estate acquired through foreclosure	17,996	17,996		18,884
Loans held for sale	26,787	26,787		34,064
Short-term borrowings	1,810,907	1,810,907		1,225,406
Write-down for termination of FDIC loss share agreement	6,603	6,603
Settlement amount	3,234	$ 3,234	21,075	16,219	$ 29,868
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	96,300	$ 96,300		81,900
Troubled Debt Restructurings [Member] | Loans With Extended Amortization Terms Or Other Payment Concessions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Extended terms and other payment concessions		28,400	31,000
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Convenant waivers		40,200
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post-Modification outstanding recorded investment		$ 35,700
Other Modifications			27,300
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	14,342	$ 14,342		12,351
Post-Modification outstanding recorded investment		42
Loans receivable	2,093,287	2,093,287	$ 2,064,368	2,059,931
Real estate in process of foreclosure	4,200	4,200		10,100
Real estate acquired through foreclosure	2,700	2,700		3,100
Consumer [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 2,078,857	$ 2,078,857		$ 2,046,757

Loans and Allowance for Loan 46

Loans and Allowance for Loan Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 18,473,841	$ 16,752,151	$ 16,035,796
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	13,886,631	12,545,507
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,493,923	2,146,713	2,017,650
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,093,287	2,059,931	2,064,368
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,401,673	2,013,890	2,024,471
Construction and Land Development [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,313,522	1,010,879	880,588
Total Commercial & Industrial [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	10,171,436	9,520,738	9,048,719
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,093,104	7,613,917	7,132,519
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,078,332	$ 1,906,821	$ 1,916,200

Loans and Allowance for Loan 47

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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			$ 229,418	$ 181,179
Allowance for loan losses: Net provision for loan losses	$ 14,951	$ 17,196	30,942	77,232
Allowance for loan losses: Decrease in FDIC loss share receivable			(2,526)	(3,437)
Allowance for loan losses: Ending balance	221,865	226,086	221,865	226,086
Allowance for loan losses: Individually evaluated for impairment	24,896	13,349	24,896	13,349
Allowance for loan losses: Amounts related to purchased credit impaired loans	15,132	19,590	15,132	19,590
Allowance for loan losses: Collectively evaluated for impairment	181,837	193,147	181,837	193,147
Loans: Individually evaluated for impairment	278,015	248,967	278,015	248,967
Loans: Purchased credit impaired loans	163,155	209,924	163,155	209,924	$ 190,915	$ 225,838
Loans: Collectively evaluated for impairment	18,032,671	15,576,905	18,032,671	15,576,905
Loans receivable	18,473,841	16,035,796	18,473,841	16,035,796	16,752,151
Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	13,886,631		13,886,631		12,545,507
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			13,509	6,041
Allowance for loan losses: Ending balance	13,540	12,799	13,540	12,799
Allowance for loan losses: Individually evaluated for impairment	1,402	72	1,402	72
Allowance for loan losses: Amounts related to purchased credit impaired loans	192	741	192	741
Allowance for loan losses: Collectively evaluated for impairment	11,946	11,986	11,946	11,986
Loans: Individually evaluated for impairment	14,913	7,803	14,913	7,803
Loans: Purchased credit impaired loans	6,247	10,752	6,247	10,752
Loans: Collectively evaluated for impairment	2,380,513	2,005,916	2,380,513	2,005,916
Loans receivable	2,401,673	2,024,471	2,401,673	2,024,471	2,013,890
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			6,271	5,642
Allowance for loan losses: Ending balance	7,049	5,006	7,049	5,006
Allowance for loan losses: Individually evaluated for impairment	1	1	1	1
Allowance for loan losses: Amounts related to purchased credit impaired loans	239	575	239	575
Allowance for loan losses: Collectively evaluated for impairment	6,809	4,430	6,809	4,430
Loans: Individually evaluated for impairment	847	1,247	847	1,247
Loans: Purchased credit impaired loans	4,160	8,761	4,160	8,761
Loans: Collectively evaluated for impairment	1,308,515	870,580	1,308,515	870,580
Loans receivable	1,313,522	880,588	1,313,522	880,588	1,010,879
Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			25,361	25,353
Allowance for loan losses: Ending balance	23,380	23,474	23,380	23,474
Allowance for loan losses: Individually evaluated for impairment	172	167	172	167
Allowance for loan losses: Amounts related to purchased credit impaired loans	12,622	15,430	12,622	15,430
Allowance for loan losses: Collectively evaluated for impairment	10,586	7,877	10,586	7,877
Loans: Individually evaluated for impairment	3,466	1,068	3,466	1,068
Loans: Purchased credit impaired loans	129,198	151,674	129,198	151,674
Loans: Collectively evaluated for impairment	2,361,259	1,864,908	2,361,259	1,864,908
Loans receivable	2,493,923	2,017,650	2,493,923	2,017,650	2,146,713
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			26,142	24,857
Allowance for loan losses: Ending balance	28,435	23,359	28,435	23,359
Allowance for loan losses: Individually evaluated for impairment	283	41	283	41
Allowance for loan losses: Amounts related to purchased credit impaired loans	942	1,257	942	1,257
Allowance for loan losses: Collectively evaluated for impairment	27,210	22,061	27,210	22,061
Loans: Individually evaluated for impairment	1,053	166	1,053	166
Loans: Purchased credit impaired loans	8,280	12,826	8,280	12,826
Loans: Collectively evaluated for impairment	2,083,954	2,051,376	2,083,954	2,051,376
Loans receivable	2,093,287	2,064,368	2,093,287	2,064,368	2,059,931
Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(297)	(78)
Allowance for loan losses: Recoveries			224	292
Allowance for loan losses: Net provision for loan losses			(622)	(307)
Allowance for loan losses: Decrease in FDIC loss share receivable			(2,526)	(3,437)
Purchased Credit Impaired Loans [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)
Allowance for loan losses: Recoveries				2
Allowance for loan losses: Net provision for loan losses			(61)	26
Allowance for loan losses: Decrease in FDIC loss share receivable
Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(58)	(18)
Allowance for loan losses: Recoveries			39	53
Allowance for loan losses: Net provision for loan losses			(148)	(117)
Allowance for loan losses: Decrease in FDIC loss share receivable
Purchased Credit Impaired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(86)	(23)
Allowance for loan losses: Recoveries			19	3
Allowance for loan losses: Net provision for loan losses			(10)	1,165
Allowance for loan losses: Decrease in FDIC loss share receivable			(2,344)	(3,378)
Purchased Credit Impaired Loans [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(153)	(8)
Allowance for loan losses: Recoveries			71	106
Allowance for loan losses: Net provision for loan losses			(112)	(1,290)
Allowance for loan losses: Decrease in FDIC loss share receivable			(135)	(98)
Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(42,806)	(36,054)
Allowance for loan losses: Recoveries			6,910	6,952
Allowance for loan losses: Net provision for loan losses			31,564	77,539
Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(160)	(191)
Allowance for loan losses: Recoveries			398	268
Allowance for loan losses: Net provision for loan losses			(146)	6,654
Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(114)	(592)
Allowance for loan losses: Recoveries			716	1,125
Allowance for loan losses: Net provision for loan losses			343	(1,087)
Non-Purchased Credit Impaired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(690)	(592)
Allowance for loan losses: Recoveries			262	480
Allowance for loan losses: Net provision for loan losses			868	466
Non-Purchased Credit Impaired Loans [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(15,107)	(11,268)
Allowance for loan losses: Recoveries			3,475	3,039
Allowance for loan losses: Net provision for loan losses			14,254	8,021
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			158,135	119,286
Allowance for loan losses: Ending balance	149,461	161,448	149,461	161,448
Allowance for loan losses: Individually evaluated for impairment	23,038	13,068	23,038	13,068
Allowance for loan losses: Amounts related to purchased credit impaired loans	1,137	1,587	1,137	1,587
Allowance for loan losses: Collectively evaluated for impairment	125,286	146,793	125,286	146,793
Loans: Individually evaluated for impairment	257,736	238,683	257,736	238,683
Loans: Purchased credit impaired loans	15,270	25,911	15,270	25,911
Loans: Collectively evaluated for impairment	9,898,430	8,784,125	9,898,430	8,784,125
Loans receivable	10,171,436	9,048,719	10,171,436	9,048,719	9,520,738
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			147,052	109,428
Allowance for loan losses: Ending balance	137,363	150,772	137,363	150,772
Allowance for loan losses: Individually evaluated for impairment	22,758	12,885	22,758	12,885
Allowance for loan losses: Amounts related to purchased credit impaired loans	395	572	395	572
Allowance for loan losses: Collectively evaluated for impairment	114,210	137,315	114,210	137,315
Loans: Individually evaluated for impairment	250,256	232,785	250,256	232,785
Loans: Purchased credit impaired loans	5,422	10,483	5,422	10,483
Loans: Collectively evaluated for impairment	7,837,426	6,889,251	7,837,426	6,889,251
Loans receivable	8,093,104	7,132,519	8,093,104	7,132,519	7,613,917
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			11,083	9,858
Allowance for loan losses: Ending balance	12,098	10,676	12,098	10,676
Allowance for loan losses: Individually evaluated for impairment	280	183	280	183
Allowance for loan losses: Amounts related to purchased credit impaired loans	742	1,015	742	1,015
Allowance for loan losses: Collectively evaluated for impairment	11,076	9,478	11,076	9,478
Loans: Individually evaluated for impairment	7,480	5,898	7,480	5,898
Loans: Purchased credit impaired loans	9,848	15,428	9,848	15,428
Loans: Collectively evaluated for impairment	2,061,004	1,894,874	2,061,004	1,894,874
Loans receivable	$ 2,078,332	$ 1,916,200	2,078,332	1,916,200	$ 1,906,821
Total Commercial & Industrial [Member] | Purchased Credit Impaired Loans [Member] | Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs				(28)
Allowance for loan losses: Recoveries			95	128
Allowance for loan losses: Net provision for loan losses			(291)	(91)
Allowance for loan losses: Decrease in FDIC loss share receivable			(47)	39
Total Commercial & Industrial [Member] | Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries			2	8
Allowance for loan losses: Net provision for loan losses			(46)	79
Allowance for loan losses: Decrease in FDIC loss share receivable			(47)	39
Total Commercial & Industrial [Member] | Purchased Credit Impaired Loans [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)
Allowance for loan losses: Recoveries			93	120
Allowance for loan losses: Net provision for loan losses			(245)	(170)
Allowance for loan losses: Decrease in FDIC loss share receivable
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(26,735)	(23,411)
Allowance for loan losses: Recoveries			2,059	2,040
Allowance for loan losses: Net provision for loan losses			16,245	63,485
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(26,218)	(22,212)
Allowance for loan losses: Recoveries			1,816	1,802
Allowance for loan losses: Net provision for loan losses			14,804	61,628
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(517)	(1,199)
Allowance for loan losses: Recoveries			243	238
Allowance for loan losses: Net provision for loan losses			$ 1,441	$ 1,857

Loans and Allowance for Loan 48

Loans and Allowance for Loan Losses (Composition of Nonaccrual Loans by Portfolio Class) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 238,219	$ 317,970
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	13,438	13,954
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,821	4,550
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	28,158	23,665
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	14,342	12,351
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	179,460	263,450
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	167,710	249,037
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 11,750	$ 14,413

Loans and Allowance for Loan 49

Loans and Allowance for Loan Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)contract	Jun. 30, 2016USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	53	21
Pre-Modification Outstanding Recorded Investment	$ 104,334	$ 58,347
Post-Modification Outstanding Recorded Investment	$ 104,336	$ 58,347
Total Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	41	17
Pre-Modification Outstanding Recorded Investment	$ 96,710	$ 57,915
Post-Modification Outstanding Recorded Investment	$ 96,710	$ 57,915
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	5
Pre-Modification Outstanding Recorded Investment	$ 6,486
Post-Modification Outstanding Recorded Investment	$ 6,486
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	6	4
Pre-Modification Outstanding Recorded Investment	$ 1,098	$ 432
Post-Modification Outstanding Recorded Investment	$ 1,098	$ 432
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1
Pre-Modification Outstanding Recorded Investment	$ 40
Post-Modification Outstanding Recorded Investment	$ 42
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	37	17
Pre-Modification Outstanding Recorded Investment	$ 92,976	$ 57,915
Post-Modification Outstanding Recorded Investment	$ 92,976	$ 57,915
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	4
Pre-Modification Outstanding Recorded Investment	$ 3,734
Post-Modification Outstanding Recorded Investment	$ 3,734

Loans and Allowance for Loan 50

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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	$ 119,917		$ 119,917		$ 169,341
Recorded investment with an allowance	158,098		158,098		132,004
Unpaid principal balance	290,322		290,322		327,722
Related allowance	24,896		24,896		29,295
Average recorded investment	267,238	$ 239,856	273,070	$ 205,971
Interest income recognized	655	532	1,043	925
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	5,678		5,678		10,447
Recorded investment with an allowance	9,235		9,235		4,929
Unpaid principal balance	15,349		15,349		15,708
Related allowance	1,402		1,402		466
Average recorded investment	14,257	8,242	14,372	9,072
Interest income recognized	34	22	77	43
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	831		831		1,106
Recorded investment with an allowance	16		16		832
Unpaid principal balance	1,820		1,820		2,903
Related allowance	1		1		38
Average recorded investment	1,219	7,660	1,492	10,905
Interest income recognized
Residential Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	2,338		2,338		2,877
Recorded investment with an allowance	1,128		1,128		1,470
Unpaid principal balance	3,984		3,984		4,865
Related allowance	172		172		91
Average recorded investment	3,352	976	3,572	932
Interest income recognized	3	2	5	4
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	1		1
Recorded investment with an allowance	1,052		1,052		2,154
Unpaid principal balance	1,055		1,055		2,155
Related allowance	283		283		267
Average recorded investment	1,601	112	1,876	109
Interest income recognized	3	1	5	2
Total Commercial & Industrial [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment			251,758	184,953
Interest income recognized			956	876
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment			246,374	179,117
Interest income recognized			934	847
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment			5,384	5,836
Interest income recognized			22	$ 29
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	111,069		111,069		154,911
Recorded investment with an allowance	146,667		146,667		122,619
Unpaid principal balance	268,114		268,114		302,091
Related allowance	23,038		23,038		28,433
Average recorded investment	246,809	222,866
Interest income recognized	615	507
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	107,555		107,555		150,650
Recorded investment with an allowance	142,701		142,701		120,612
Unpaid principal balance	260,544		260,544		295,445
Related allowance	22,758		22,758		28,187
Average recorded investment	241,122	216,907
Interest income recognized	597	493
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	3,514		3,514		4,261
Recorded investment with an allowance	3,966		3,966		2,007
Unpaid principal balance	7,570		7,570		6,646
Related allowance	280		$ 280		$ 246
Average recorded investment	5,687	5,959
Interest income recognized	$ 18	$ 14

Loans and Allowance for Loan 51

Loans and Allowance for Loan Losses (Age Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 268,267	$ 195,107
Current	18,205,574	16,557,044
Total loans	18,473,841	16,752,151	$ 16,035,796
Recorded investment > 90 days and accruing	18,390	3,039
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	83,099	67,482
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	50,152	18,968
Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	135,016	108,657
Total Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	13,886,631	12,545,507
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	10,728	5,914
Current	2,390,945	2,007,976
Total loans	2,401,673	2,013,890	2,024,471
Recorded investment > 90 days and accruing	1,989	216
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	3,369	838
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	2,319	50
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	5,040	5,026
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	8,849	6,165
Current	1,304,673	1,004,714
Total loans	1,313,522	1,010,879	880,588
Recorded investment > 90 days and accruing		1,563
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	6,250	694
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	619	171
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	1,980	5,300
Total Commercial [Member] | Total Commercial & Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	159,754	100,035
Current	10,011,682	9,420,703
Total loans	10,171,436	9,520,738	9,048,719
Recorded investment > 90 days and accruing	13,512	436
Total Commercial [Member] | Total Commercial & Industrial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	32,283	22,730
Total Commercial [Member] | Total Commercial & Industrial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	29,163	2,490
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	98,308	74,815
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	147,712	90,136
Current	7,945,392	7,523,781
Total loans	8,093,104	7,613,917	7,132,519
Recorded investment > 90 days and accruing	13,088	384
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	27,751	19,722
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	27,974	1,909
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	91,987	68,505
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	12,042	9,899
Current	2,066,290	1,896,922
Total loans	2,078,332	1,906,821	1,916,200
Recorded investment > 90 days and accruing	424	52
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	4,532	3,008
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,189	581
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	6,321	6,310
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	59,729	47,784
Current	2,434,194	2,098,929
Total loans	2,493,923	2,146,713	2,017,650
Recorded investment > 90 days and accruing	2,801	1
Residential Mortgages [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	25,433	24,599
Residential Mortgages [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	12,208	8,816
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	22,088	14,369
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	29,207	35,209
Current	2,064,080	2,024,722
Total loans	2,093,287	2,059,931	$ 2,064,368
Recorded investment > 90 days and accruing	88	823
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	15,764	18,621
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	5,843	7,441
Consumer [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 7,600	$ 9,147

Loans and Allowance for Loan 52

Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 18,473,841	$ 16,752,151	$ 16,035,796
Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,886,631	12,545,507
Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,204,585	10,925,611
Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	528,671	351,888
Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	280,023	248,696
Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	869,886	1,001,599
Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,466	17,713
Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,493,923	2,146,713	2,017,650
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,093,287	2,059,931	2,064,368
Residential Mortgage and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,587,210	4,206,644
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,401,673	2,013,890	2,024,471
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,214,329	1,873,644
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	117,247	78,309
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,840	22,492
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	56,247	39,434
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10	11
Construction and Land Development [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,313,522	1,010,879	880,588
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,233,082	968,505
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	58,024	22,592
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,591	4,142
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,825	15,640
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,171,436	9,520,738	9,048,719
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,757,174	8,083,462
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	353,400	250,987
Total Commercial & Industrial [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	258,592	222,062
Total Commercial & Industrial [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	798,814	946,525
Total Commercial & Industrial [Member] | Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,456	17,702
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,093,104	7,613,917	7,132,519
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,897,989	6,364,348
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	298,254	203,311
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	215,373	181,763
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	678,032	846,793
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,456	17,702
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,078,332	1,906,821	$ 1,916,200
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,859,185	1,719,114
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	55,146	47,676
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	43,219	40,299
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	120,782	99,732
Performing [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,462,964	2,123,048
Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,078,857	2,046,757
Performing [Member] | Residential Mortgage and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,541,821	4,169,805
Nonperforming [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	30,959	23,665
Nonperforming [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,430	13,174
Nonperforming [Member] | Residential Mortgage and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 45,389	$ 36,839

Loans and Allowance for Loan 53

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, 2017	Dec. 31, 2016
Loans and Allowance for Loan Losses [Abstract]
Carrying Amount of Loans, Balance at beginning of period	$ 190,915	$ 225,838
Carrying Amount of Loans, Payments received, net	(36,950)	(55,194)
Carrying Amount of Loans, Accretion	9,190	20,271
Carrying Amount of Loans, Balance at end of period	163,155	190,915
Accretable Yield, Balance at beginning of period	113,686	129,488
Accretable Yield, Payments received, net	(6,258)	(11,024)
Accretable Yield, Accretion	(9,190)	(20,271)
Accretable Yield, Increase in expected cash flows based on actual cash flow and changes in cash flow assumptions	4,405	5,358
Accretable Yield, Net transfers from nonaccretable difference to accretable yield	5,183	10,135
Accretable Yield, Balance at end of period	$ 107,826	$ 113,686

Loans and Allowance for Loan 54

Loans and Allowance for Loan Losses (Activity in Loss Share Receivable) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Loans and Allowance for Loan Losses [Abstract]
Beginning balance			$ 16,219	$ 29,868
Amortization	$ (1,327)	$ (1,526)	(2,427)	(3,139)
Charge-offs, write-downs and other recoveries			(2,442)	(2,683)
External expenses qualifying under loss share agreement			79	307
Adjustment due to changes in cash flow projections			(2,526)	(3,437)
Net payments to FDIC			934	159
Write-down for termination of loss share agreement	6,603		6,603
Ending balance	$ 3,234	$ 21,075	$ 3,234	$ 21,075

Securities Sold under Agreeme55

Securities Sold under Agreements to Repurchase (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Securities Sold under Agreements to Repurchase [Abstract]
Securities sold under agreements to repurchase	$ 482.1	$ 358.1

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Notional amount of derivatives	$ 2,564,737		$ 2,564,737		$ 2,342,791
Ineffective portion of change in derivative fair value			0	$ 0
Derivative income reflected in the income statement	2,700	$ 500	3,100	400
Impact to interest income from cash flow hedges	(200)	700	(100)	1,000
Aggregate fair value of derivatives in a net liability position	16,800		16,800
Noninterest income	67,487	63,694	130,978	121,880
Deposits	18,364	$ 12,603	31,183	$ 24,336
Derivatives Designated as Hedging Instruments [Member]
Derivative [Line Items]
Notional amount of derivatives	1,113,000		1,113,000		1,100,000
Interest Rate Swaps [Member]
Derivative [Line Items]
Noninterest income			100
Deposits			400
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member]
Derivative [Line Items]
Notional amount of derivatives	750,000		750,000		$ 1,100,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 3, Expires 2019 [Member]
Derivative [Line Items]
Notional amount of derivatives	250,000		250,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 4, Expires 2020 [Member]
Derivative [Line Items]
Notional amount of derivatives	200,000		200,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 5, Expires 2022 [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 300,000		$ 300,000
Derivative maturity expiration year			2,022
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Two [Member] | Swap Agreement 3, Expires 2019 [Member]
Derivative [Line Items]
Derivative maturity expiration year			2,019
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Three [Member] | Swap Agreement 4, Expires 2020 [Member]
Derivative [Line Items]
Derivative maturity expiration year			2,020

Derivatives (Fair Values of Der

Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		$ 2,564,737	$ 2,342,791
Fair Values, Assets		1,345	4,788
Fair Values, Liabilities		5,763	26,846
Less: Netting Adjustment, Assets	[1],[2]	(2,894)
Less: Netting Adjustment, Liabilities	[1],[2]	(16,444)
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		1,113,000	1,100,000
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		1,451,737	1,242,791
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	[3]	1,130,367	979,391
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		111,667	84,732
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		87,204	75,676
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		66,483	46,840
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		56,016	56,152
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	19,769	20,315
Total derivative assets/liabilities	[1]	16,875	20,315
Other Assets [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	18
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	19,751	20,315
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1],[3]	17,536	18,405
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	39	50
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	7	900
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	563	189
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	1,606	771
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	28,657	27,432
Total derivative assets/liabilities	[1]	12,213	27,432
Other Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	8,137	7,787
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	20,520	19,645
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1],[3]	18,011	18,362
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	117	105
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	825	221
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	5	228
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	1,562	729
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		750,000	1,100,000
Cash Flow Hedge [Member] | Other Assets [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	18
Cash Flow Hedge [Member] | Other Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	7,619	$ 7,787
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		363,000
Fair Values, Liabilities	[1]	$ 518
[1]	Derivative assets and liabilities are reported at fair value in other assets or other liabilities, respectively, in the consolidated balance sheets.
[2]	Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information.
[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, 2017	Dec. 31, 2016
Derivatives [Abstract]
Gross Amounts Recognized, Derivative Assets	$ 5,308	$ 4,788
Gross Amounts Offset in the Statement of Financial Position, Derivative Assets	(3,963)
Net Amounts Presented in the Statement of Financial Position, Derivative Assets	1,345	4,788
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments, Derivative Assets	1,345	4,788
Gross Amounts Not offset in the Statement of Financial Position -Cash Collateral, Derivative Assets
Net Amounts Presented in the Statement of Financial Position, Derivative Assets
Gross Amounts Recognized, Derivative Liabilities	22,155	26,846
Gross Amounts Offset in the Statement of Financial Position, Derivative Liabilities	(16,392)
Net Amounts Presented in the Statement of Financial Position, Derivative Liabilities	5,763	26,846
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments, Derivative Liabilities	1,345	4,788
Gross Amounts Not offset in the Statement of Financial Position -Cash Collateral, Derivative Liabilities	7,099	19,095
Net Amounts Presented in the Statement of Financial Position, Derivative Liabilities		$ 2,963
Net Amount, Derivative Liabilities	$ (2,681)

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Treasury stock shares	1	1.3
Treasury stock, Carry basis	$ 17.6	$ 24.1
Restricted Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares nonvested	1.7	2

Stockholders' Equity (Component

Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				$ (120,532)		$ (80,595)
Net change in unrealized gain (loss)		$ 12,661	$ 16,629	13,845		45,601
Reclassification of net (gain) loss realized and included in earnings		1,718	711	3,105		1,802
Valuation adjustment for pension plan amendment		17,315		17,315	[1]
Other valuation adjustments for employee benefit plan		(10,782)		(10,782)
Amortization of unrealized net loss on securities transferred to HTM		1,099	830	1,749		1,628
Income tax expense (benefit)		7,938	6,645	9,139		17,977
Ending Balance		(104,439)	(49,541)	(104,439)		(49,541)
Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(28,679)		4,268
Net change in unrealized gain (loss)				14,687		41,990
Reclassification of net (gain) loss realized and included in earnings						(1,114)
Valuation adjustment for pension plan amendment	[1]
Other valuation adjustments for employee benefit plan
Amortization of unrealized net loss on securities transferred to HTM
Income tax expense (benefit)				5,333		14,970
Ending Balance		(19,325)	30,174	(19,325)		30,174
HTM Securities Transferred from AFS [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(14,392)		(16,795)
Net change in unrealized gain (loss)
Reclassification of net (gain) loss realized and included in earnings
Valuation adjustment for pension plan amendment	[1]
Other valuation adjustments for employee benefit plan
Amortization of unrealized net loss on securities transferred to HTM				1,749		1,628
Income tax expense (benefit)				657		625
Ending Balance		(13,300)	(15,792)	(13,300)		(15,792)
Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(72,501)		(67,890)
Net change in unrealized gain (loss)
Reclassification of net (gain) loss realized and included in earnings				3,105		2,916
Valuation adjustment for pension plan amendment	[1]			17,315
Other valuation adjustments for employee benefit plan				(10,782)
Amortization of unrealized net loss on securities transferred to HTM
Income tax expense (benefit)				3,458		1,066
Ending Balance		(66,321)	(66,040)	(66,321)		(66,040)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(4,960)		(178)
Net change in unrealized gain (loss)				(842)		3,611
Reclassification of net (gain) loss realized and included in earnings
Valuation adjustment for pension plan amendment	[1]
Other valuation adjustments for employee benefit plan
Amortization of unrealized net loss on securities transferred to HTM
Income tax expense (benefit)				(309)		1,316
Ending Balance		$ (5,493)	$ 2,117	(5,493)		2,117
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Valuation adjustment for pension plan amendment	[2],[3]			$ (3,105)		$ (2,916)
[1]	For further discussion on the pension plan amendment, see Note 11 - Retirement Plans.
[2]	Amounts in parenthesis indicate reduction in net income.
[3]	These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see Note 11 - Retirement Plans for additional details).

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, 2017	Jun. 30, 2017		Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items		$ 17,315	$ 17,315	[1]
Available for Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items	[1]
HTM Securities Transferred from AFS [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items	[1]
Employee Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items	[1]		17,315
Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items	[1]
Amount Reclassified from Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	[2]		(3,083)		$ (2,129)
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	[2]				1,114
Tax effect	[2]				(390)
Net of tax	[2]				724
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	[2]		(1,749)		(1,628)
Tax effect	[2]		657		625
Net of tax	[2]		(1,092)		(1,003)
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	[2],[3]		(3,105)		(2,916)
Tax effect	[2]		1,114		1,066
Net of tax	[2]		$ (1,991)		$ (1,850)
[1]	For further discussion on the pension plan amendment, see Note 11 - Retirement Plans.
[2]	Amounts in parenthesis indicate reduction in net income.
[3]	These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see Note 11 - Retirement Plans for additional details).

Other Noninterest Income (Detai

Other Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Noninterest Income [Abstract]
Income from bank-owned life insurance	$ 2,883	$ 4,501	$ 5,535	$ 7,051
Credit related fees	2,898	2,267	5,776	4,624
Derivative income	2,680	533	3,145	394
Net (loss) gain on sale of assets	(60)	1,801	4,065	3,566
Safety deposit box income	391	413	840	891
Other miscellaneous	4,082	2,041	6,388	4,376
Total other noninterest income	$ 12,874	$ 11,556	$ 25,749	$ 20,902

Other Noninterest Expense (Deta

Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Noninterest Expense [Abstract]
Advertising	$ 4,984	$ 2,693	$ 8,061	$ 5,050
Ad valorem and franchise taxes	3,519	2,340	6,555	4,643
Printing and supplies	1,330	1,065	2,508	2,176
Insurance expense	807	829	1,624	1,664
Travel expense	1,350	1,079	2,409	2,028
Entertainment and contributions	1,982	2,001	3,765	3,633
Tax credit investment amortization	1,213	1,833	2,425	3,576
Write-down for termination of FDIC loss share agreement	6,603		6,603
Other miscellaneous	5,879	4,633	12,347	10,412
Total other noninterest expense	$ 27,667	$ 16,473	$ 46,297	$ 33,182

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income to common shareholders	$ 52,267	$ 46,907	$ 101,281	$ 50,746
Net income allocated to participating securities - basic and diluted	1,166	1,136	2,322	1,233
Net income allocated to common shareholders - basic and diluted	$ 51,101	$ 45,771	$ 98,959	$ 49,513
Weighted-average common shares - basic	84,614,000	77,523,000	84,489,000	77,512,000
Dilutive potential common shares	253,000	157,000	266,000	164,000
Weighted-average common shares - diluted	84,867,000	77,680,000	84,755,000	77,676,000
Earnings per common share: Basic	$ 0.60	$ 0.59	$ 1.17	$ 0.64
Earnings per common share: Diluted	$ 0.60	$ 0.59	$ 1.17	$ 0.64
Weighted-average anti-dilutive potential common shares	19,397	548,821	17,701	602,809

Retirement Plans (Narrative) (D

Retirement Plans (Narrative) (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2017USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributed to pension plan		$ 0
Estimated contribution in the current year		0
Amended Hancock Pension Plan And 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$ 537,600,000	537,600,000
Benefit obligation	476,900,000	$ 476,900,000
Benefit obligation decreased	$ (17,300,000)
Amended Hancock 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Period of employment for eligibility		3 years
Additional matching percentage	2
2% Of Contribution [Member] | Amended Hancock 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage	2.00%
4% Of Contribution [Member] | Amended Hancock 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage	4.00%
6% Of Contribution [Member] | Amended Hancock 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage	6.00%

Retirement Plans (Components of

Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4,093	$ 3,611	$ 7,843	$ 6,876
Interest cost	4,291	4,023	8,414	9,011
Expected return on plan assets	(9,576)	(8,554)	(18,326)	(17,445)
Amortization of net loss	1,766	1,426	3,201	2,894
Net periodic benefit cost	574	506	1,132	1,336
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	47	45	95	74
Interest cost	179	203	359	409
Amortization of net loss	(48)	53	(96)	22
Net periodic benefit cost	$ 178	$ 301	$ 358	$ 505

Share-Based Payment Arrangeme67

Share-Based Payment Arrangements (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017USD ($)entity$ / sharesshares	Jun. 30, 2016USD ($)
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised | $	$ 4,100,000	$ 0
Restricted and Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense | $	$ 43,800,000
Weighted-average period	3 years 2 months 12 days
Total fair value of shares vested | $	$ 10,000,000	$ 2,000,000
Shares granted | shares	61,099
Grant date fair value per share | $ / shares	$ 42.09
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	23,489
Grant date fair value per share | $ / shares	$ 42.92
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	23,489
Grant date fair value per share | $ / shares	$ 38.26
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 Arrangeme68

Share-Based Payment Arrangements (Summary of Option Activity) (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic Value, Outstanding at Beginning | $	$ 3,734
Aggregate Intrinsic Value, Exercised/Released | $	4,065
Aggregate Intrinsic Value, Cancelled/Forfeited | $	$ 6
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at Beginning | shares	456,258
Number of Shares, Exercised/Released | shares	(330,644)
Number of Shares, Cancelled/Forfeited | shares	(538)
Number of Shares, Expired | shares	(2,570)
Number of Shares, Outstanding at Ending | shares	122,506
Number of Shares, Exercisable at Ending | shares	122,506
Weighted Average Exercise Price, Outstanding at Beginning | $ / shares	$ 35.91
Weighted Average Exercise Price, Exercised/Released | $ / shares	34.56
Weighted Average Exercise Price, Cancelled/Forfeited | $ / shares	32.09
Weighted Average Exercise Price, Expired | $ / shares	64.74
Weighted Average Exercise Price, Outstanding at Ending | $ / shares	38.98
Weighted Average Exercise Price, Exercisable at Ending | $ / shares	$ 38.98
Weighted Average Remaining Contractual Term (Years), Outstanding at Ending	2 years 9 months 18 days
Weighted Average Remaining Contractual Term (Years), Exercisable at Ending	2 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding at Ending | $	$ 1,507
Aggregate Intrinsic Value, Exercisable at Ending | $	$ 1,507

Share-Based Payment Arrangeme69

Share-Based Payment Arrangements (Summary of Nonvested Restricted and Performance Shares) (Details) - Restricted and Performance Shares [Member]	6 Months Ended
	Jun. 30, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Nonvested at Beginning | shares	2,152,119
Number of Shares, Granted | shares	61,099
Number of Shares, Vested | shares	(201,137)
Number of Shares, Forfeited | shares	(38,670)
Number of Shares, Nonvested at Ending | shares	1,973,411
Weighted Average Grant Date Fair Value, Nonvested at Beginning | $ / shares	$ 32.15
Weighted Average Grant Date Fair Value, Granted | $ / shares	42.09
Weighted Average Grant Date Fair Value, Vested | $ / shares	30.18
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	32.37
Weighted Average Grant Date Fair Value, Nonvested at Ending | $ / shares	$ 32.65

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - Investment Securities [Member] - Recurring [Member]	6 Months Ended
	Jun. 30, 2017
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, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		$ 2,794,382	$ 2,516,908
Derivative assets		1,345	4,788
Derivative liabilities		5,763	26,846
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		2,794,382	2,516,908
Derivative assets	[1]	16,875	20,315
Total recurring fair value measurements - assets		2,811,257	2,537,223
Derivative liabilities	[1]	12,213	27,432
Total recurring fair value measurements - liabilities		12,213	27,432
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		2,794,382	2,516,908
Derivative assets	[1]	16,875	20,315
Total recurring fair value measurements - assets		2,811,257	2,537,223
Derivative liabilities	[1]	12,213	27,432
Total recurring fair value measurements - liabilities		12,213	27,432
Recurring [Member] | U.S. Treasury And Government Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		74,840	54,828
Recurring [Member] | U.S. 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 debt securities		74,840	54,828
Recurring [Member] | Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		245,156	242,155
Recurring [Member] | Municipal Obligations [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		245,156	242,155
Recurring [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		3,500	3,500
Recurring [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		3,500	3,500
Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		1,854,099	1,611,355
Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		1,854,099	1,611,355
Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		433,098	402,591
Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		433,098	402,591
Recurring [Member] | Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		183,689	202,479
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 debt securities		$ 183,689	$ 202,479
[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, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	$ 137,653	$ 169,888
Other real estate owned	8,447	13,968
Total nonrecurring fair value measurements	146,100	183,856
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	137,653	169,888
Total nonrecurring fair value measurements	137,653	169,888
Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	8,447	13,968
Total nonrecurring fair value measurements	$ 8,447	$ 13,968

Fair Value (Estimated Fair Valu

Fair Value (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	$ 2,794,382	$ 2,516,908
Held to maturity securities	2,874,454	2,500,220
Derivative financial instruments	1,345	4,788
Derivative financial instruments	5,763	26,846
Total Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	491,653	450,866
Available for sale debt securities	2,794,382	2,516,908
Held to maturity securities	2,866,529	2,470,117
Loans, net	18,092,405	16,496,849
Loans held for sale	26,787	34,064
Derivative financial instruments	16,875	20,315
Deposits	21,432,877	19,430,939
Federal funds purchased	76,798	2,275
Securities sold under agreements to repurchase	482,109	358,131
FHLB short-term borrowings	1,252,000	865,000
Long-term debt	407,409	435,747
Derivative financial instruments	12,213	27,432
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	491,653	450,866
Federal funds purchased	76,798	2,275
Securities sold under agreements to repurchase	482,109	358,131
FHLB short-term borrowings	1,252,000	865,000
Total Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	2,794,382	2,516,908
Held to maturity securities	2,866,529	2,470,117
Loans, net	137,653	169,888
Loans held for sale	26,787	34,064
Derivative financial instruments	16,875	20,315
Long-term debt	407,409	435,747
Derivative financial instruments	12,213	27,432
Total Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net	17,954,752	16,326,961
Deposits	21,432,877	19,430,939
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	491,653	450,866
Available for sale debt securities	2,794,382	2,516,908
Held to maturity securities	2,874,454	2,500,220
Loans, net	18,251,976	16,522,733
Loans held for sale	26,787	34,064
Derivative financial instruments	16,875	20,315
Deposits	21,442,815	19,424,266
Federal funds purchased	76,798	2,275
Securities sold under agreements to repurchase	482,109	358,131
FHLB short-term borrowings	1,252,000	865,000
Long-term debt	407,876	436,280
Derivative financial instruments	$ 12,213	$ 27,432