Bank OZK 10-Q 8 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 29, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Trading Symbol	OZRK
Entity Registrant Name	BANK OF THE OZARKS INC
Entity Central Index Key	1,038,205
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		121,108,258

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 800,583	$ 89,122
Interest earning deposits	5,943	1,866
Cash and cash equivalents	806,526	90,988
Investment securities - available for sale (“AFS”)	824,399	602,348
Non-purchased loans and leases	8,214,900	6,528,634
Purchased loans	1,515,104	1,806,037
Total loans and leases	9,730,004	8,334,671
Allowance for loan and lease losses	(65,133)	(60,854)
Net loans and leases	9,664,871	8,273,817
Premises and equipment, net	305,475	296,238
Foreclosed assets	23,328	22,870
Accrued interest receivable	35,256	25,499
Bank owned life insurance (“BOLI”)	348,033	300,427
Intangible assets, net	149,904	152,340
Other, net	121,787	114,932
Total assets	12,279,579	9,879,459
LIABILITIES AND STOCKHOLDERS’ EQUITY
Demand non-interest bearing	1,647,825	1,515,482
Savings and interest bearing transaction	5,135,981	4,017,504
Time	3,411,266	2,438,482
Total deposits	10,195,072	7,971,468
Repurchase agreements with customers	53,997	65,800
Other borrowings	42,053	204,540
Subordinated notes	222,324
Subordinated debentures	117,962	117,685
Accrued interest payable and other liabilities	88,059	52,172
Total liabilities	10,719,467	8,411,665
Commitments and contingencies
Stockholders’ equity:
Preferred stock; $0.01 par value; 1,000,000 shares authorized; no shares outstanding at June 30, 2016 or December 31, 2015
Common stock; $0.01 par value; 300,000,000 and 125,000,000 shares authorized at June 30, 2016 and December 31, 2015, respectively; 90,745,002, and 90,612,388 shares issued at June 30, 2016 and December 31, 2015, respectively	907	906
Additional paid-in capital	755,782	755,995
Retained earnings	785,126	706,628
Accumulated other comprehensive income	15,106	7,959
Treasury stock, at cost, none at June 30, 2016 and 133,492 shares at December 31, 2015		(6,857)
Total stockholders’ equity before noncontrolling interest	1,556,921	1,464,631
Noncontrolling interest	3,191	3,163
Total stockholders’ equity	1,560,112	1,467,794
Total liabilities and stockholders’ equity	$ 12,279,579	$ 9,879,459

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	125,000,000
Common stock, shares issued	90,745,002	90,612,388
Treasury stock, Shares	0	133,492

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest income:
Non-purchased loans and leases	$ 98,036	$ 56,637	$ 185,046	$ 107,069
Purchased loans	26,711	35,762	55,734	68,622
Investment securities:
Taxable	2,442	3,230	4,712	6,715
Tax-exempt	3,727	4,456	7,159	9,125
Deposits with banks and federal funds sold	13	18	19	27
Total interest income	130,929	100,103	252,670	191,558
Interest expense:
Deposits	10,214	3,917	18,063	7,454
Repurchase agreements with customers	22	19	42	36
Other borrowings	293	1,443	595	3,146
Subordinated notes	283		283
Subordinated debentures	1,079	968	2,132	1,676
Total interest expense	11,891	6,347	21,115	12,312
Net interest income	119,038	93,756	231,555	179,246
Provision for loan and lease losses	4,834	4,308	6,851	10,623
Net interest income after provision for loan and lease losses	114,204	89,448	224,704	168,623
Non-interest income:
Service charges on deposit accounts	8,119	7,088	15,776	13,715
Mortgage lending income	2,057	1,772	3,341	3,279
Trust income	1,574	1,463	3,080	2,895
BOLI income	2,745	1,785	5,605	5,407
Other income from purchased loans, net	4,599	6,971	7,651	15,879
Gains on sales of other assets	998	2,557	2,025	5,385
Net gains on investment securities		85		2,618
Other	2,641	1,549	5,119	3,159
Total non-interest income	22,733	23,270	42,597	52,337
Non-interest expense:
Salaries and employee benefits	24,921	22,646	48,282	45,243
Net occupancy and equipment	8,388	7,344	16,918	14,635
Other operating expenses	17,619	13,734	33,414	34,030
Total non-interest expense	50,928	43,724	98,614	93,908
Income before taxes	86,009	68,994	168,687	127,052
Provision for income taxes	31,514	24,190	62,497	42,330
Net income	54,495	44,804	106,190	84,722
Earnings attributable to noncontrolling interest	(21)	(28)	(28)	(52)
Net income available to common stockholders	$ 54,474	$ 44,776	$ 106,162	$ 84,670
Basic earnings per common share	$ 0.60	$ 0.52	$ 1.17	$ 0.99
Diluted earnings per common share	0.60	0.51	1.16	0.98
Dividends declared per common share	$ 0.155	$ 0.135	$ 0.305	$ 0.265

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 54,495	$ 44,804	$ 106,190	$ 84,722
Other comprehensive income (loss):
Unrealized gains and losses on investment securities AFS	6,187	(10,091)	10,382	(7,600)
Tax effect of unrealized gains and losses on investment securities AFS	(1,512)	3,844	(3,235)	3,157
Reclassification of gains and losses on investment securities AFS included in net income		(85)		(2,618)
Tax effect of reclassification of gains and losses on investment securities AFS included in net income		33		997
Total other comprehensive income (loss)	4,675	(6,299)	7,147	(6,064)
Total comprehensive income	$ 59,170	$ 38,505	$ 113,337	$ 78,658

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Intervest Bancshares Corporation [Member]	Common Stock [Member]	Common Stock [Member]Intervest Bancshares Corporation [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member]Intervest Bancshares Corporation [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Non-Controlling Interest [Member]
Balances at Dec. 31, 2014	$ 911,842		$ 799		$ 324,354		$ 571,454	$ 14,132	$ (2,349)	$ 3,452
Net income	84,722						84,722
Earnings attributable to noncontrolling interest							(52)			52
Total other comprehensive income	(6,064)							(6,064)
Common stock dividends paid	(22,126)						(22,126)
Issuance of common stock for exercise of stock options	997		1		996
Issuance of unvested restricted common stock			2		(2,351)				2,349
Excess tax benefit on exercise and forfeiture of stock options and restricted common stock	791				791
Stock-based compensation expense	4,220				4,220
Issuance of common stock for acquisition		$ 238,376		$ 66		$ 238,310
Balances at Jun. 30, 2015	1,212,758		868		566,320		633,998	8,068		3,504
Balances at Dec. 31, 2015	1,467,794		906		755,995		706,628	7,959	(6,857)	3,163
Net income	106,190						106,190
Earnings attributable to noncontrolling interest							(28)			28
Total other comprehensive income	7,147							7,147
Common stock dividends paid	(27,664)						(27,664)
Issuance of common stock for exercise of stock options	756				756
Issuance of unvested restricted common stock			1		(6,858)				$ 6,857
Excess tax benefit on exercise and forfeiture of stock options and restricted common stock	763				763
Stock-based compensation expense	5,126				5,126
Balances at Jun. 30, 2016	$ 1,560,112		$ 907		$ 755,782		$ 785,126	$ 15,106		$ 3,191

Consolidated Statements of Sto7

Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Common stock dividends paid	$ 0.305	$ 0.265
Issuance of common stock for exercise of stock options, shares	53,770	99,050
Issuance of unvested restricted common stock, shares	213,907	245,300
Forfeiture of unvested restricted common stock, shares	13,986	29,875
Issuance of common stock to non-employee directors, shares	12,415	7,657
Common stock issuance costs		$ 100,000
Intervest Bancshares Corporation [Member]
Issuance of common stock for acquisitions		6,637,243

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 106,190	$ 84,722
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,048	4,575
Amortization	3,569	3,236
Earnings attributable to noncontrolling interest	(28)	(52)
Provision for loan and lease losses	6,851	10,623
Provision for losses on foreclosed assets	1,260	2,427
Net amortization (accretion) of investment securities AFS	866	(51)
Net gains on investment securities AFS		(2,618)
Originations of mortgage loans held for sale	(122,523)	(136,267)
Proceeds from sales of mortgage loans held for sale	112,901	127,302
Accretion of purchased loans	(18,694)	(29,288)
Gains on sales of other assets	(2,025)	(5,385)
Prepayment penalty on Federal Home Loan Bank of Dallas advances		2,480
Deferred income tax expense	564	2,252
Increase in cash surrender value of BOLI	(5,605)	(3,119)
BOLI death benefits in excess of cash surrender value		(2,289)
Stock-based compensation expense	5,126	4,220
Excess tax benefit on stock-based compensation	(763)	(791)
Changes in assets and liabilities:
Accrued interest receivable	(9,757)	(4,420)
Other assets, net	(10,379)	28,658
Accrued interest payable and other liabilities	(5,349)	(1,951)
Net cash provided by operating activities	68,252	84,264
Cash flows from investing activities:
Proceeds from sales of investment securities AFS		32,777
Proceeds from maturities/calls/paydowns of investment securities AFS	83,365	81,532
Purchases of investment securities AFS	(268,513)	(37,522)
Net increase of non-purchased loans and leases	(1,672,874)	(800,061)
Net payments received on purchased loans	305,336	422,693
Purchases of premises and equipment	(15,323)	(9,720)
Purchases of BOLI	(42,000)	(85,000)
Proceeds from BOLI death benefits		3,149
Proceeds from sales of other assets	11,333	40,018
Cash received from (invested in) unconsolidated investments and noncontrolling interest	478	(639)
Net cash received in merger and acquisition transaction		274,235
Net cash used by investing activities	(1,598,198)	(78,538)
Cash flows from financing activities:
Net increase in deposits	2,223,604	406,269
Net repayments of other borrowings	(162,487)	(31,404)
Net (decrease) increase in repurchase agreements with customers	(11,803)	4,434
Proceeds from exercise of stock options	756	997
Proceeds from issuance of subordinated notes	222,315
Excess tax benefit on stock-based compensation	763	791
Cash dividends paid on common stock	(27,664)	(22,126)
Net cash provided by financing activities	2,245,484	358,961
Net increase in cash and cash equivalents	715,538	364,687
Cash and cash equivalents – beginning of period	90,988	150,203
Cash and cash equivalents – end of period	$ 806,526	$ 514,890

Organization and Principles of

Organization and Principles of Consolidation	6 Months Ended
	Jun. 30, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Principles of Consolidation	1. Organization and Principles of Consolidation Bank of the Ozarks, Inc. (the “Company”) is a financial holding company headquartered in Little Rock, Arkansas, which operates under the rules and regulations of the Board of Governors of the Federal Reserve System. The Company owns a wholly-owned state chartered bank subsidiary – Bank of the Ozarks (the “Bank”), eight 100%-owned finance subsidiary business trusts – Ozark Capital Statutory Trust II (“Ozark II”), Ozark Capital Statutory Trust III (“Ozark III”), Ozark Capital Statutory Trust IV (“Ozark IV”), Ozark Capital Statutory Trust V (“Ozark V”) (collectively, the “Ozark Trusts”), Intervest Statutory Trust II (“Intervest II”), Intervest Statutory Trust III (“Intervest III”), Intervest Statutory Trust IV (“Intervest IV”) and Intervest Statutory Trust V (“Intervest V”), (collectively, the “Intervest Trusts”; and together with Ozark Trusts, the “Trusts”) and, indirectly through the Bank, a subsidiary that holds the Company’s investment securities, a subsidiary engaged in the development of real estate, a subsidiary that owns private aircraft and various other entities that hold foreclosed assets or tax credits or engage in other activities. The Company and Bank are subject to the regulation of certain federal and state agencies and undergo periodic examinations by those regulatory authorities. The consolidated financial statements include the accounts of the Company, the Bank, the investment subsidiary, the real estate subsidiary, the aircraft subsidiary and certain of those various other entities in accordance with accounting principles generally accepted in the United States (“GAAP”). Significant intercompany transactions and amounts have been eliminated in consolidation. At June 30, 2016, the Company had 177 offices, including 83 in Arkansas, 28 in Georgia, 25 in North Carolina, 22 in Texas, 10 in Florida, three in Alabama and two offices each in South Carolina, New York and California. On July 15, 2016, the Company closed its office in Greensboro, North Carolina. Additionally, as discussed in Note 16 to these financial statements, on July 20, 2016, the Company completed its acquisition of Community & Southern Holdings, Inc. (“C&S”) whereby it acquired 46 Georgia banking offices and one Florida banking office; and on July 21, 2016, the Company completed its acquisition of C1 Financial, Inc. (“C1”) whereby it acquired 33 Florida banking offices. As of July 22, 2016, the Company had 256 banking offices.

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Basis of Presentation	2. Basis of Presentation The accompanying consolidated financial statements have been prepared by the Company, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) in Article 10 of Regulation S-X and in accordance with the instructions to Form 10-Q and GAAP for interim financial information. Certain information, accounting policies and footnote disclosures normally included in complete financial statements prepared in accordance with GAAP have been condensed or omitted in accordance with such rules and regulations. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. In the opinion of management, all adjustments considered necessary, consisting of normal recurring items, have been included for a fair statement of the accompanying consolidated financial statements. Operating results for the three and six months ended June 30, 2016 are not necessarily indicative of the results that may be expected for the full year or future periods. As provided under GAAP, management has up to twelve months following the date of the acquisition to finalize the fair values of the acquired assets and assumed liabilities. Once management has finalized the fair values of acquired assets and assumed liabilities within this 12-month period, management considers such values to be the day 1 fair values (“Day 1 Fair Values”). Certain reclassifications of prior period amounts have been made to conform with the current period presentation. These reclassifications had no impact on previously reported net income.

Earnings Per Common Share ("EPS

Earnings Per Common Share ("EPS")	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Common Share ("EPS")	3. Earnings Per Common Share (“EPS”) Basic EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding. Diluted EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding after consideration of the dilutive effect, if any, of outstanding common stock options using the treasury stock method. For the three months ended June 30, 2016, options to purchase 648,293 shares of the Company’s common stock at a weighted-average exercise price of $53.80 were excluded from the diluted EPS calculations as inclusion of these options would have been anti-dilutive. No options were excluded from the diluted EPS calculations for the three months ended June 30, 2015. For the six months ended June 30, 2016 and 2015, options to purchase 654,076 shares and 531,500 shares, respectively, of the Company’s common stock at a weighted-average exercise price of $54.92 and $40.30, respectively, were excluded from the diluted EPS calculations. The following table presents the computation of basic and diluted EPS for the periods indicated. Three Months Ended Six Months Ended June 30, June 30, 2016 2015 2016 2015 (In thousands, except per share amounts) Numerator: Distributed earnings allocated to common stockholders $ 14,061 $ 11,713 $ 27,664 $ 22,126 Undistributed earnings allocated to common stockholders 40,413 33,063 78,498 62,544 Net income available to common stockholders $ 54,474 $ 44,776 $ 106,162 $ 84,670 Denominator: Denominator for basic EPS – weighted-average common shares 90,730 86,786 90,708 85,251 Effect of dilutive securities – stock options 558 729 560 750 Denominator for diluted EPS – weighted-average common shares and assumed conversions 91,288 87,515 91,268 86,001 Basic EPS $ 0.60 $ 0.52 $ 1.17 $ 0.99 Diluted EPS $ 0.60 $ 0.51 $ 1.16 $ 0.98

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2016
Investments Debt And Equity Securities [Abstract]
Investment Securities	4. Investment Securities At June 30, 2016 and December 31, 2015, the Company classified all of its investment securities portfolio as AFS. Accordingly, investment securities are stated at estimated fair value in the consolidated financial statements with unrealized gains and losses, net of related income tax, reported as a separate component of stockholders’ equity and included in accumulated other comprehensive income. The following table presents the amortized cost and estimated fair value of investment securities AFS as of the dates indicated. The Company’s investment in the “CRA qualified investment fund” includes shares held in a mutual fund that qualifies under the Community Reinvestment Act of 1977 for community reinvestment purposes. The Company’s holdings of “other equity securities” include Federal Home Loan Bank of Dallas (“FHLB”) and First National Banker’s Bankshares, Inc. (“FNBB”) shares which do not have readily determinable fair values and are carried at cost. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (Dollars in thousands) June 30, 2016: Obligations of state and political subdivisions $ 584,184 $ 18,921 $ (15 ) $ 603,090 U.S. Government agency securities 206,234 4,382 (60 ) 210,556 Corporate obligations 3,554 — — 3,554 CRA qualified investment fund 1,049 12 — 1,061 Other equity securities 6,138 — — 6,138 Total $ 801,159 $ 23,315 $ (75 ) $ 824,399 December 31, 2015: Obligations of state and political subdivisions $ 415,095 $ 12,321 $ (138 ) $ 427,278 U.S. Government agency securities 146,265 1,720 (1,035 ) 146,950 Corporate obligations 3,562 — — 3,562 CRA qualified investment fund 1,038 — (10 ) 1,028 Other equity securities 23,530 — — 23,530 Total $ 589,490 $ 14,041 $ (1,183 ) $ 602,348 The following table shows estimated fair value of investment securities AFS having gross unrealized losses and the amount of such unrealized losses, aggregated by investment category and length of time that individual investment securities have been in a continuous unrealized loss position, as of the dates indicated. Less than 12 Months 12 Months or More Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses (Dollars in thousands) June 30, 2016: Obligations of state and political subdivisions $ 12,007 $ 3 $ 4,747 $ 11 $ 16,754 $ 14 U.S. Government agency securities 16,959 55 150 6 17,109 61 Total temporarily impaired securities $ 28,966 $ 58 $ 4,897 $ 17 $ 33,863 $ 75 December 31, 2015: Obligations of state and political subdivisions $ 18,018 $ 114 $ 6,167 $ 24 $ 24,185 $ 138 U.S. Government agency securities 72,671 930 4,381 105 77,052 1,035 CRA qualified investment fund 1,029 10 — — 1,029 10 Total temporarily impaired securities $ 91,718 $ 1,054 $ 10,548 $ 129 $ 102,266 $ 1,183 In evaluating the Company’s unrealized loss positions for other-than-temporary impairment of its investment securities portfolio, management considers the credit quality of the issuer, the nature and cause of the unrealized loss, the severity and duration of the impairments and other factors. At June 30, 2016 and December 31, 2015, management determined the unrealized losses were the result of fluctuations in interest rates and did not reflect deteriorations of the credit quality of the investments. Accordingly, management considers these unrealized losses to be temporary in nature. The Company does not have the intent to sell these investment securities with unrealized losses and, more likely than not, will not be required to sell these investment securities before fair value recovers to amortized cost. The following table shows the amortized cost and estimated fair value of investment securities AFS by maturity or estimated date of repayment as of the date indicated. June 30, 2016 Maturity or Estimated Repayment Amortized Cost Estimated Fair Value (Dollars in thousands) One year or less $ 36,283 $ 36,803 After one year to five years 128,770 131,296 After five years to ten years 181,074 186,674 After ten years 455,032 469,626 Total $ 801,159 $ 824,399 For purposes of this maturity or repayment distribution, all investment securities AFS are shown based on their contractual maturity date or estimated date of repayment, except (i) FHLB and FNBB equity securities and the CRA qualified investment fund with no contractual maturity date are shown in the longest maturity category and (ii) U.S. Government agency securities and municipal housing authority securities backed by residential mortgages are allocated among various maturities or repayment categories based on an estimated repayment schedule utilizing Bloomberg median prepayment speeds or other estimates of prepayment speeds and interest rate levels at the measurement date. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. The following table is a summary of sales activities in the Company’s investment securities AFS for the periods indicated. Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 (Dollars in thousands) Sales proceeds $ — $ 2,660 $ — $ 32,777 Gross realized gains 85 2,619 Gross realized losses — — — (1 ) Net gains on investment securities $ — $ 85 $ — $ 2,618

Allowance for Loan and Lease Lo

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators	6 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators	5. Allowance for Loan and Lease Losses (“ALLL”) and Credit Quality Indicators Allowance for Loan and Lease Losses The following table is a summary of activity within the ALLL for the periods indicated. Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 (Dollars in thousands) Beginning balance $ 61,760 $ 54,147 $ 60,854 $ 52,918 Non-purchased loans and leases charged off (1,218 ) (1,496 ) (2,565 ) (5,575 ) Recoveries of non-purchased loans and leases previously charged off 191 198 444 506 Net non-purchased loans and leases charged off (1,027 ) (1,298 ) (2,121 ) (5,069 ) Purchased loans charged off (470 ) (702 ) (535 ) (2,115 ) Recoveries of purchased loans previously charged off 36 294 84 392 Net purchased loans charged off (434 ) (408 ) (451 ) (1,723 ) Net charge-offs - total loans and leases (1,461 ) (1,706 ) (2,572 ) (6,792 ) Provision for loan and lease losses: Non-purchased loans and leases 4,400 3,900 6,400 8,900 Purchased loans 434 408 451 1,723 Total provision 4,834 4,308 6,851 10,623 Ending balance $ 65,133 $ 56,749 $ 65,133 $ 56,749 ALLL allocated to non-purchased loans and leases $ 63,933 $ 56,749 $ 63,933 $ 56,749 ALLL allocated to purchased loans 1,200 — 1,200 — Total ALLL $ 65,133 $ 56,749 $ 65,133 $ 56,749 The following tables are a summary of the Company’s ALLL for the periods indicated. Beginning Balance Charge-offs Recoveries Provision Ending Balance (Dollars in thousands) Three months ended June 30, 2016: Real estate: Residential 1-4 family $ 9,429 $ (13 ) $ 13 $ 670 $ 10,099 Non-farm/non-residential 18,761 — — 357 19,118 Construction/land development 15,259 — 49 2,188 17,496 Agricultural 3,684 — — 71 3,755 Multifamily residential 3,914 — 14 (267 ) 3,661 Commercial and industrial 3,399 (31 ) 6 416 3,790 Consumer 707 (35 ) 2 38 712 Direct financing leases 4,235 (808 ) 5 660 4,092 Other 1,172 (331 ) 102 267 1,210 Purchased loans 1,200 (470 ) 36 434 1,200 Total $ 61,760 $ (1,688 ) $ 227 $ 4,834 $ 65,133 Six months ended June 30, 2016: Real estate: Residential 1-4 family $ 8,672 $ (256 ) $ 37 $ 1,646 $ 10,099 Non-farm/non-residential 16,796 (12 ) — 2,334 19,118 Construction/land development 18,176 (20 ) 51 (711 ) 17,496 Agricultural 3,388 (7 ) — 374 3,755 Multifamily residential 3,031 — 14 616 3,661 Commercial and industrial 2,574 (42 ) 39 1,219 3,790 Consumer 707 (68 ) 14 59 712 Direct financing leases 3,835 (1,468 ) 16 1,709 4,092 Other 2,475 (692 ) 273 (846 ) 1,210 Purchased loans 1,200 (535 ) 84 451 1,200 Total $ 60,854 $ (3,100 ) $ 528 $ 6,851 $ 65,133 Beginning Balance Charge-offs Recoveries Provision Ending Balance (Dollars in thousands) Three months ended June 30, 2015: Real estate: Residential 1-4 family $ 5,657 $ (92 ) $ 10 $ 26 $ 5,601 Non-farm/non-residential 17,766 (119 ) 5 580 18,232 Construction/land development 17,580 (469 ) — 2,037 19,148 Agricultural 2,526 — — (66 ) 2,460 Multifamily residential 2,423 (208 ) — 671 2,886 Commercial and industrial 3,301 (93 ) 23 18 3,249 Consumer 824 (24 ) 21 4 825 Direct financing leases 3,258 (155 ) 7 444 3,554 Other 812 (336 ) 132 186 794 Purchased loans — (702 ) 294 408 — Total $ 54,147 $ (2,198 ) $ 492 $ 4,308 $ 56,749 Six months ended June 30, 2015: Real estate: Residential 1-4 family $ 5,482 $ (621 ) $ 21 $ 719 $ 5,601 Non-farm/non-residential 17,190 (324 ) 17 1,349 18,232 Construction/land development 15,960 (771 ) 37 3,922 19,148 Agricultural 2,558 (13 ) — (85 ) 2,460 Multifamily residential 2,147 (208 ) — 947 2,886 Commercial and industrial 4,873 (2,540 ) 39 877 3,249 Consumer 818 (69 ) 42 34 825 Direct financing leases 2,989 (341 ) 13 893 3,554 Other 901 (688 ) 337 244 794 Purchased loans — (2,115 ) 392 1,723 — Total $ 52,918 $ (7,690 ) $ 898 $ 10,623 $ 56,749 The following table is a summary of the Company’s ALLL for non-purchased loans and leases and recorded investment in non-purchased loans and leases as of the dates indicated. ALLL for Non-Purchased Loans and Leases Non-Purchased Loans and Leases ALLL for Individually Evaluated Impaired Loans and Leases ALLL for All Other Loans and Leases Total ALLL (1) Individually Evaluated Impaired Loans and Leases All Other Loans and Leases Total Loans and Leases (Dollars in thousands) June 30, 2016: Real estate: Residential 1-4 family $ 267 $ 9,832 $ 10,099 $ 2,092 $ 406,142 $ 408,234 Non-farm/non-residential 21 19,097 19,118 1,033 2,619,419 2,620,452 Construction/land development 46 17,450 17,496 280 3,600,475 3,600,755 Agricultural 468 3,287 3,755 1,328 88,979 90,307 Multifamily residential — 3,661 3,661 — 591,792 591,792 Commercial and industrial 508 3,282 3,790 709 254,003 254,712 Consumer 5 707 712 45 28,492 28,537 Direct financing leases — 4,092 4,092 — 133,775 133,775 Other — 1,210 1,210 6 486,330 486,336 Total $ 1,315 $ 62,618 $ 63,933 $ 5,493 $ 8,209,407 $ 8,214,900 December 31, 2015: Real estate: Residential 1-4 family $ 297 $ 8,375 $ 8,672 $ 2,030 $ 348,224 $ 350,254 Non-farm/non-residential 31 16,765 16,796 940 2,009,926 2,010,866 Construction/land development 48 18,128 18,176 5,556 2,820,019 2,825,575 Agricultural 475 2,913 3,388 1,313 73,127 74,440 Multifamily residential — 3,031 3,031 83 440,745 440,828 Commercial and industrial 487 2,087 2,574 714 230,567 231,281 Consumer 2 705 707 24 27,721 27,745 Direct financing leases — 3,835 3,835 — 147,735 147,735 Other — 2,475 2,475 7 419,903 419,910 Total $ 1,340 $ 58,314 $ 59,654 $ 10,667 $ 6,517,967 $ 6,528,634 (1) The following table is a summary of impaired non-purchased loans and leases as of and for the three and six months ended June 30, 2016. Principal Balance Net Charge-offs to Date Principal Balance, Net of Charge-offs Specific ALLL Weighted Average Carrying Value – Three Months Ended June 30, 2016 Weighted Average Carrying Value – Six Months Ended June 30, 2016 (Dollars in thousands) Impaired loans and leases for which there is a related ALLL: Real estate: Residential 1-4 family $ 2,766 $ (1,763 ) $ 1,003 $ 267 $ 1,256 $ 1,207 Non-farm/non-residential 1,087 (914 ) 173 21 113 93 Construction/land development 118 — 118 46 119 120 Agricultural 1,145 — 1,145 468 1,147 1,149 Commercial and industrial 829 (321 ) 508 508 514 511 Consumer 49 (15 ) 34 5 22 18 Total impaired loans and leases with a related ALLL 5,994 (3,013 ) 2,981 1,315 3,171 3,098 Impaired loans and leases for which there is not a related ALLL: Real estate: Residential 1-4 family 1,568 (479 ) 1,089 — 981 961 Non-farm/non-residential 1,058 (198 ) 860 — 861 869 Construction/land development 925 (763 ) 162 — 1,926 3,096 Agricultural 392 (209 ) 183 — 183 175 Multifamily residential 133 (133 ) — — 41 55 Commercial and industrial 251 (50 ) 201 — 201 204 Consumer 16 (5 ) 11 — 11 11 Other 6 — 6 — 6 7 Total impaired loans and leases without a related ALLL 4,349 (1,837 ) 2,512 — 4,210 5,378 Total impaired non-purchased loans and leases $ 10,343 $ (4,850 ) $ 5,493 $ 1,315 $ 7,381 $ 8,476 The following table is a summary of impaired non-purchased loans and leases as of and for the year ended December 31, 2015. Principal Balance Net Charge-offs to Date Principal Balance, Net of Charge-offs Specific ALLL Weighted Average Carrying Value – Year Ended December 31, 2015 (Dollars in thousands) Impaired loans and leases for which there is a related ALLL: Real estate: Residential 1-4 family $ 2,914 $ (1,804 ) $ 1,110 $ 297 $ 1,279 Non-farm/non-residential 962 (907 ) 55 31 129 Construction/land development 121 — 121 48 896 Agricultural 1,153 — 1,153 475 479 Commercial and industrial 825 (322 ) 503 487 404 Consumer 26 (15 ) 11 2 16 Total impaired loans and leases with a related ALLL 6,001 (3,048 ) 2,953 1,340 3,203 Impaired loans and leases for which there is not a related ALLL: Real estate: Residential 1-4 family 1,306 (386 ) 920 — 955 Non-farm/non-residential 1,083 (198 ) 885 — 1,137 Construction/land development 7,873 (2,438 ) 5,435 — 8,255 Agricultural 362 (202 ) 160 — 261 Multifamily residential 216 (133 ) 83 — 155 Commercial and industrial 261 (50 ) 211 — 141 Consumer 18 (5 ) 13 — 14 Other 7 — 7 — 7 Total impaired loans and leases without a related ALLL 11,126 (3,412 ) 7,714 — 10,925 Total impaired non-purchased loans and leases $ 17,127 $ (6,460 ) $ 10,667 $ 1,340 $ 14,128 Management has determined that certain of the Company’s impaired non-purchased loans and leases do not require any specific allowance at June 30, 2016 or at December 31, 2015 because (i) management’s analysis of such individual loans and leases resulted in no impairment or (ii) all identified impairment on such loans and leases had previously been charged off. Interest income on impaired non-purchased loans and leases is recognized on a cash basis when and if actually collected. Total interest income recognized on impaired non-purchased loans and leases for the three and six months ended June 30, 2016 and 2015 was not material. Credit Quality Indicators Non-Purchased Loans and Leases The following table is a summary of credit quality indicators for the Company’s non-purchased loans and leases as of the dates indicated. Satisfactory Moderate Watch Substandard Total (Dollars in thousands) June 30, 2016: Real estate: Residential 1-4 family (1) $ 399,027 $ — $ 4,095 $ 5,112 $ 408,234 Non-farm/non-residential 2,270,225 265,385 79,323 5,519 2,620,452 Construction/land development 3,302,321 286,631 10,362 1,441 3,600,755 Agricultural 51,010 28,270 9,362 1,665 90,307 Multifamily residential 542,211 46,668 1,857 1,056 591,792 Commercial and industrial 165,438 84,965 3,017 1,292 254,712 Consumer (1) 28,101 — 221 215 28,537 Direct financing leases 132,887 170 160 558 133,775 Other (1) 480,365 5,650 207 114 486,336 Total $ 7,371,585 $ 717,739 $ 108,604 $ 16,972 $ 8,214,900 December 31, 2015: Real estate: Residential 1-4 family (1) $ 342,083 $ — $ 2,946 $ 5,225 $ 350,254 Non-farm/non-residential 1,692,632 235,999 73,788 8,447 2,010,866 Construction/land development 2,553,368 256,655 8,916 6,636 2,825,575 Agricultural 40,538 22,799 8,909 2,194 74,440 Multifamily residential 400,848 35,080 4,079 821 440,828 Commercial and industrial 179,797 47,802 1,854 1,828 231,281 Consumer (1) 27,219 — 276 250 27,745 Direct financing leases 146,934 201 190 410 147,735 Other (1) 415,686 4,027 182 15 419,910 Total $ 5,799,105 $ 602,563 $ 101,140 $ 25,826 $ 6,528,634 (1) The Company does not risk rate its residential 1-4 family loans, its consumer loans, and certain “other” loans. However, for purposes of the above table, the Company considers such loans to be (i) satisfactory – if they are performing and less than 30 days past due, (ii) watch – if they are performing and 30 to 89 days past due or (iii) substandard – if they are nonperforming or 90 days or more past due. The following categories of credit quality indicators are used by the Company. Satisfactory Moderate Watch Substandard The following table is an aging analysis of past due non-purchased loans and leases as of the dates indicated. 30-89 Days Past Due (1) 90 Days or More (2) Total Past Due Current (3) Total (Dollars in thousands) June 30, 2016: Real estate: Residential 1-4 family $ 4,677 $ 1,585 $ 6,262 $ 401,972 $ 408,234 Non-farm/non-residential 2,258 1,145 3,403 2,617,049 2,620,452 Construction/land development 3,531 224 3,755 3,597,000 3,600,755 Agricultural 1,372 183 1,555 88,752 90,307 Multifamily residential 736 — 736 591,056 591,792 Commercial and industrial 309 740 1,049 253,663 254,712 Consumer 219 22 241 28,296 28,537 Direct financing leases 419 492 911 132,864 133,775 Other — 108 108 486,228 486,336 Total $ 13,521 $ 4,499 $ 18,020 $ 8,196,880 $ 8,214,900 December 31, 2015: Real estate: Residential 1-4 family $ 2,793 $ 1,507 $ 4,300 $ 345,954 $ 350,254 Non-farm/non-residential 1,881 777 2,658 2,008,208 2,010,866 Construction/land development 1,043 5,645 6,688 2,818,887 2,825,575 Agricultural 1,780 243 2,023 72,417 74,440 Multifamily residential — 83 83 440,745 440,828 Commercial and industrial 823 751 1,574 229,707 231,281 Consumer 248 33 281 27,464 27,745 Direct financing leases 517 321 838 146,897 147,735 Other 8 7 15 419,895 419,910 Total $ 9,093 $ 9,367 $ 18,460 $ 6,510,174 $ 6,528,634 (1) Includes $1.4 million and $1.9 million at June 30, 2016 and December 31, 2015, respectively, of loans and leases on nonaccrual status. (2) All loans and leases greater than 90 days past due were on nonaccrual status at June 30, 2016 and December 31, 2015. (3) Includes $1.9 million and $2.3 million of loans and leases on nonaccrual status at June 30, 2016 and December 31, 2015, respectively. Purchased Loans As of June 30, 2016, the Company had identified purchased loans where it had determined it was probable that the Company would be unable to collect all amounts according to the contractual terms thereof (for purchased loans without evidence of credit deterioration at date of acquisition) or the expected performance of such loans had deteriorated from its performance expectations established in conjunction with the determination of the Day 1 Fair Values or since its most recent review of such portfolio’s performance (for purchased loans with evidence of credit deterioration at date of acquisition). At June 30, 2016, the Company had $6.4 million of impaired purchased loans compared to $8.1 million at December 31, 2015. The following table is a summary of credit quality indicators for the Company’s purchased loans as of the dates indicated. Purchased Loans Without Evidence of Credit Deterioration at Acquisition Purchased Loans With Evidence of Credit Deterioration at Acquisition Total Purchased FV 33 FV 44 FV 55 FV 36 FV 77 FV 66 FV 88 Loans (Dollars in thousands) June 30, 2016: Real estate: Residential 1-4 family $ 53,349 $ 88,447 $ 33,412 $ 73,753 $ 72 $ 68,805 $ 1,516 $ 319,354 Non-farm/non-residential 181,990 615,083 111,291 3,926 422 81,111 4,149 997,972 Construction/land development 11,660 9,356 5,960 3,366 22 6,822 88 37,274 Agricultural 3,353 4,889 999 472 — 3,522 — 13,235 Multifamily residential 16,641 59,309 24,998 824 13 2,661 — 104,446 Commercial and industrial 6,803 10,287 7,077 3,560 25 5,693 72 33,517 Consumer 551 125 29 3,757 — 200 — 4,662 Other 3,051 838 143 93 8 511 — 4,644 Total $ 277,398 $ 788,334 $ 183,909 $ 89,751 $ 562 $ 169,325 $ 5,825 $ 1,515,104 December 31, 2015: Real estate: Residential 1-4 family $ 59,497 $ 117,498 $ 38,888 $ 85,684 $ 351 $ 82,862 $ 2,172 $ 386,952 Non-farm/non-residential 209,542 693,707 122,652 5,039 363 99,681 4,563 1,135,547 Construction/land development 13,121 12,511 7,137 4,771 22 10,224 37 47,823 Agricultural 4,825 7,963 1,456 797 — 4,877 — 19,918 Multifamily residential 20,347 86,588 27,818 896 13 3,835 — 139,497 Commercial and industrial 8,912 29,001 9,244 5,649 20 7,185 511 60,522 Consumer 726 205 185 6,106 2 263 — 7,487 Other 3,944 3,316 212 243 — 576 — 8,291 Total $ 320,914 $ 950,789 $ 207,592 $ 109,185 $ 771 $ 209,503 $ 7,283 $ 1,806,037 The following grades are used for purchased loans without evidence of credit deterioration at the date of acquisition. FV 33 FV 44 FV 55 FV 36 FV 77 The following grades are used for purchased loans with evidence of credit deterioration at the date of acquisition. FV 66 FV 88 The following table is an aging analysis of past due purchased loans as of the dates indicated. 30-89 Days Past Due 90 Days or More Total Past Due Current Total Purchased Loans (Dollars in thousands) June 30, 2016: Real estate: Residential 1-4 family $ 6,492 $ 5,094 $ 11,586 $ 307,768 $ 319,354 Non-farm/non-residential 1,578 5,931 7,509 990,463 997,972 Construction/land development 412 816 1,228 36,046 37,274 Agriculture 130 353 483 12,752 13,235 Multifamily residential — 13 13 104,433 104,446 Commercial and industrial 661 1,084 1,745 31,772 33,517 Consumer 52 29 81 4,581 4,662 Other — — — 4,644 4,644 Total $ 9,325 $ 13,320 $ 22,645 $ 1,492,459 $ 1,515,104 Purchased loans without evidence of credit deterioration at date of acquisition $ 4,246 $ 3,193 $ 7,439 $ 1,332,515 $ 1,339,954 Purchased loans with evidence of credit deterioration at date of acquisition 5,079 10,127 15,206 159,944 175,150 Total $ 9,325 $ 13,320 $ 22,645 $ 1,492,459 $ 1,515,104 December 31, 2015: Real estate: Residential 1-4 family $ 9,042 $ 6,293 $ 15,335 $ 371,617 $ 386,952 Non-farm/non-residential 3,435 6,837 10,272 1,125,275 1,135,547 Construction/land development 919 1,255 2,174 45,649 47,823 Agriculture 106 356 462 19,456 19,918 Multifamily residential 299 — 299 139,198 139,497 Commercial and industrial 714 924 1,638 58,884 60,522 Consumer 101 41 142 7,345 7,487 Other 10 11 21 8,270 8,291 Total $ 14,626 $ 15,717 $ 30,343 $ 1,775,694 $ 1,806,037 Purchased loans without evidence of credit deterioration at date of acquisition $ 7,972 $ 2,743 $ 10,715 $ 1,578,536 $ 1,589,251 Purchased loans with evidence of credit deterioration at date of acquisition 6,654 12,974 19,628 197,158 216,786 Total $ 14,626 $ 15,717 $ 30,343 $ 1,775,694 $ 1,806,037 At June 30, 2016 and December 31, 2015, a portion of the Company’s purchased loans with evidence of credit deterioration at the date of acquisition were past due, including many that were 90 days or more past due. Such delinquencies were included in the Company’s performance expectations in determining the Day 1 Fair Values. Additionally, in accordance with GAAP, the Company continues to accrete into earnings income on such loans.

Subordinated Notes

Subordinated Notes	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Subordinated Notes	6 . Subordinated Notes On June 23, 2016, the Company completed an underwritten public offering of $225 million in aggregate principal amount of its 5.50% Fixed-to-Floating Rate Subordinated Notes due 2026 (the “Notes”) for net proceeds of $222.3 million. The Notes were issued pursuant to the Subordinated Indenture, dated as of June 23, 2016 (the “Base Indenture”), between the Company and U.S. Bank National Association, as trustee (the “Trustee”), as supplemented by the First Supplemental Indenture, dated as of June 23, 2016 (the “Supplemental Indenture”), between the Company and the Trustee. The Base Indenture, as amended and supplemented by the Supplemental Indenture, governs the terms of the Notes and provides that the Notes are unsecured, subordinated debt obligations of the Company and will mature on July 1, 2026. From and including the date of issuance to, but excluding July 1, 2021, the Notes will bear interest at an initial rate of 5.50% per annum. From and including July 1, 2021 to, but excluding the maturity date or earlier redemption, the Notes will bear interest at a floating rate equal to three-month London Interbank Offered Rate (“LIBOR”) as calculated on each applicable date of determination plus a spread of 442.5 basis points; provided, however, that in the event three-month LIBOR is less than zero, then three-month LIBOR shall be deemed to be zero. Debt issuance costs of $2.7 million are being amortized, using a level-yield methodology over the estimated holding period of seven years, as an increase in interest expense on the Notes. The Company may, beginning with the interest payment date of July 1, 2021, and on any interest payment date thereafter, redeem the Notes, in whole or in part, at a redemption price equal to 100% of the principal amount of the Notes to be redeemed plus accrued and unpaid interest to but excluding the date of redemption. The Company may also redeem the Notes at any time, including prior to July 1, 2021, at the Company’s option, in whole but not in part, if: (i) a change or prospective change in law occurs that could prevent the Company from deducting interest payable on the Notes for U.S. federal income tax purposes; (ii) a subsequent event occurs that could preclude the Notes from being recognized as Tier 2 capital for regulatory capital purposes; or (iii) the Company is required to register as an investment company under the Investment Company Act of 1940, as amended; in each case, at a redemption price equal to 100% of the principal amount of the Notes plus any accrued and unpaid interest to but excluding the redemption date.

Supplemental Data for Cash Flow

Supplemental Data for Cash Flows	6 Months Ended
	Jun. 30, 2016
Supplemental Cash Flow Elements [Abstract]
Supplemental Data for Cash Flows	7 . Supplemental Data for Cash Flows The following table provides supplemental cash flow information for the periods indicated. Six Months Ended June 30, 2016 2015 (Dollars in thousands) Cash paid during the period for: Interest $ 20,073 $ 13,031 Taxes 71,904 34,024 Supplemental schedule of non-cash investing and financing activities: Net change in unrealized gains/losses on investment securities AFS 10,382 (10,218 ) Loans transferred to foreclosed assets 10,236 9,797 Loans advanced for sales of foreclosed assets 127 — Unsettled AFS investment security purchases 27,388 4,453 Unsettled loan sales — 14,361 Unsettled loan purchases 14,428 18,269 Common stock issued in merger and acquisition transaction — 238,476

Guarantees and Commitments

Guarantees and Commitments	6 Months Ended
	Jun. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Guarantees and Commitments	8. Guarantees and Commitments Outstanding standby letters of credit are contingent commitments issued by the Company generally to guarantee the performance of a customer in third party arrangements. The maximum amount of future payments the Company could be required to make under these guarantees at June 30, 2016 was $17.3 million. The Company holds collateral to support guarantees when deemed necessary. Collateralized commitments at June 30, 2016 totaled $16.2 million. At June 30, 2016, the Company had outstanding commitments totaling $7.35 billion to extend credit, consisting primarily of loans closed but not yet funded. The following table shows, as of the date indicated, the contractual maturities of such outstanding commitments. Contractual Maturities at June 30, 2016 Maturity Amount (Dollars in thousands) 2016 $ 200,997 2017 1,010,841 2018 2,603,175 2019 2,123,899 2020 1,286,274 Thereafter 124,541 Total $ 7,349,727

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	9. Stock-Based Compensation The Company has a nonqualified stock option plan for certain employees of the Company. This plan provides for the granting of nonqualified options to purchase shares of common stock in the Company. No option may be granted under this plan for less than the fair market value of the common stock, defined by the plan as the average of the highest reported asked price and the lowest reported bid price, on the date of the grant. The benefits or amounts that may be received by or allocated to any particular officer or employee of the Company under this plan will be determined in the sole discretion of the personnel and compensation committee of the Company’s board of directors. All employee options outstanding at June 30, 2016 were issued with a vesting date three years after issuance and an expiration date seven years after issuance. All shares issued in connection with options exercised under the employee non-qualified stock option plan were in the form of newly issued shares. In addition, the Company has a non-employee director stock plan (the “Director Plan”) that provides for awards of common stock to eligible non-employee directors. The Director Plan grants to each director who is not otherwise an employee of the Company, or any subsidiary, shares of common stock on the day of his or her election as director of the Company at each annual shareholders meeting, or any special meeting called for the purpose of electing a director or directors of the Company, and upon appointment for the first time as a director of the Company. The number of shares of common stock to be awarded will be the equivalent of $35,000 worth of shares of common stock based on the average of the highest reported asked price and lowest reported bid price on the grant date. The common stock awarded under this plan is fully vested on the grant date. The aggregate number of shares of common stock which may be issued as awards under this plan will not exceed 50,000 shares, subject to certain adjustments. The Company issued 12,415 shares and 7,657 shares of common stock under the Director Plan during the six months ended June 30, 2016 and 2015, respectively. Stock based compensation expense for shares of common stock issued under the Director Plan included in non-interest expense was $0.5 million for both the three months and six months ended June 30, 2016 and $0.3 million for the three and six months ended June 30, 2015. Prior to the adoption of the Director Plan, the Company had a nonqualified stock option plan for non-employee directors. No options were granted under this plan during the six months ended June 30, 2016 or 2015. All options previously granted under this plan were exercisable immediately and expire ten years after issuance. The following table summarizes stock option activity for the period indicated. Options Weighted- Average Exercise Price/Share Weighted-Average Remaining Contractual Life (in years) Aggregate Intrinsic Value (in thousands) Six Months Ended June 30, 2016: Outstanding – December 31, 2015 2,034,476 $ 34.50 Granted 6,683 45.89 Exercised (53,770 ) 16.76 Forfeited (63,125 ) 39.35 Outstanding – June 30, 2016 1,924,264 34.94 5.2 $ 14,822 (1) Fully vested and exercisable – June 30, 2016 402,855 $ 15.03 3.7 $ 9,061 (1) Expected to vest in future periods 1,428,628 Fully vested and expected to vest – June 30, 2016 (2) 1,831,483 $ 34.38 5.1 $ 14,707 (1) (1) Based on closing price of $37.52 per share on June 30, 2016. (2) At June 30, 2016, the Company estimated that outstanding options to purchase 92,781 shares of its common stock would not vest and would be forfeited prior to their vesting date. Intrinsic value for stock options is defined as the amount by which the current market price of the underlying stock exceeds the exercise price. For those stock options where the exercise price exceeds the current market price of the underlying stock, the intrinsic value is zero. The total intrinsic value of options exercised during the three months ended June 30, 2016 and 2015 was $0.7 million and $1.4 million, respectively. The total intrinsic value of options exercised during the six months ended June 30, 2016 and 2015 was $1.5 million and $2.8 million, respectively. Stock based compensation expense for stock options included in non-interest expense was $1.0 million and $0.6 million for the three months ended June 30, 2016 and 2015, respectively, and $2.0 million and $1.2 million for the six months ended June 30, 2016 and 2015, respectively. Total unrecognized compensation cost related to non-vested stock option grants was $8.8 million at June 30, 2016 and is expected to be recognized over a weighted-average period of 2.1 years. The Company has a restricted stock and incentive plan whereby all officers and employees of the Company are eligible to receive awards of restricted stock, restricted stock units or performance awards. The benefits or amounts that may be received by or allocated to any particular officer or employee of the Company under this plan will be determined in the sole discretion of the Company’s board of directors or its personnel and compensation committee. Shares of common stock issued under the plan may be shares of original issuance or shares held in treasury that have been reacquired by the Company. The vesting period for all restricted stock awards granted under the plan shall be not less than three years from the date of grant, subject to limited exceptions. The following table summarizes non-vested restricted stock activity for the period indicated. Six Months Ended June 30, 2016 Outstanding – December 31, 2015 435,475 Granted 213,907 Forfeited (13,986 ) Vested — Outstanding – June 30, 2016 635,396 Weighted-average grant date fair value $ 35.08 The fair value of the restricted stock awards is amortized to compensation expense over the vesting period and is based on the market price of the Company’s common stock at the date of grant multiplied by the number of shares granted that are expected to vest. Stock-based compensation expense for restricted stock included in non-interest expense was $1.7 million for the three months and $2.7 million for the six months ended June 30, 2016, compared to $1.4 million for the three months and $2.7 million for the six months ended June 30, 2015. Unrecognized compensation expense for non-vested restricted stock awards was $12.6 million at June 30, 2016 and is expected to be recognized over a weighted-average period of 2.1 years.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	10. Fair Value Measurements The Company measures certain of its assets and liabilities on a fair value basis using various valuation techniques and assumptions, depending on the nature of the asset or liability. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Additionally, fair value is used either annually or on a non-recurring basis to evaluate certain assets and liabilities for impairment or for disclosure purposes. The Company had no liabilities that were accounted for at fair value at June 30, 2016 or December 31, 2015. The Company applies the following fair value hierarchy. Level 1 − Quoted prices for identical instruments in active markets. Level 2 − Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable. Level 3 − Instruments whose inputs are unobservable. The following table sets forth the Company’s assets, as of the dates indicated, that are accounted for at fair value. Level 1 Level 2 Level 3 Total (Dollars in thousands) June 30, 2016: Investment securities AFS (1) Obligations of state and political subdivisions $ — $ 585,199 $ 17,891 603,090 U.S. Government agency securities — 210,556 — 210,556 Corporate obligations — 3,554 — 3,554 CRA qualified investment fund 1,061 — — 1,061 Total investment securities AFS 1,061 799,309 17,891 818,261 Impaired non-purchased loans and leases — — 4,178 4,178 Impaired purchased loans — — 6,387 6,387 Foreclosed assets — — 23,328 23,328 Total assets at fair value $ 1,061 $ 799,309 $ 51,784 $ 852,154 December 31, 2015: Investment securities AFS (1) Obligations of state and political subdivisions $ — $ 408,774 $ 18,504 $ 427,278 U.S. Government agency securities — 146,950 — 146,950 Corporate obligations — 3,562 — 3,562 CRA qualified investment fund 1,028 — — 1,028 Total investment securities AFS 1,028 559,286 18,504 578,818 Impaired non-purchased loans and leases — — 9,327 9,327 Impaired purchased loans — — 8,054 8,054 Foreclosed assets — — 22,870 22,870 Total assets at fair value $ 1,028 $ 559,286 $ 58,755 $ 619,069 (1) Does not include $6.1 million at June 30, 2016 and $23.5 million at December 31, 2015 of FHLB and FNBB equity securities that do not have readily determinable fair values and are carried at cost. The following table presents information related to Level 3 non-recurring fair value measurements as of the date indicated. Description Fair Value at June 30, 2016 Technique Unobservable Inputs (Dollars in thousands) Impaired non-purchased loans and leases $ 4,178 Third party appraisal (1) or discounted cash flows 1. Management discount based on underlying collateral characteristics and market conditions 2. Life of Loan Impaired purchased loans $ 6,387 Third party appraisal (1) and/or discounted cash flows 1. Management discount based on underlying collateral characteristics and market conditions 2. Life of Loan Foreclosed assets $ 23,328 Third party appraisal, (1) broker price opinions and/or discounted cash flows 1. Management discount based on underlying collateral characteristics and market conditions 2. Discount rate 3. Holding period (1) The Company utilizes valuation techniques consistent with the market, cost, and income approaches, or a combination thereof in determining fair value. The following methods and assumptions are used to estimate the fair value of the Company’s assets that are accounted for at fair value. Investment securities The Company has determined that certain of its investment securities had a limited to non-existent trading market at June 30, 2016. As a result, the Company considers these investments as Level 3 in the fair value hierarchy. Specifically, the fair values of certain obligations of state and political subdivisions consisting primarily of certain unrated private placement bonds (the “private placement bonds”) in the amount of $17.9 million at June 30, 2016 were calculated using Level 3 hierarchy inputs and assumptions as the trading market for such securities was determined to be “not active.” This determination was based on the limited number of trades or, in certain cases, the existence of no reported trades for the private placement bonds. The private placement bonds are generally prepayable at par value at the option of the issuer. As a result, management believes the private placement bonds should be individually valued at the lower of (i) the matrix pricing provided by the Company’s third party pricing services for comparable unrated municipal securities or (ii) par value. At June 30, 2016, the third parties’ pricing matrices valued the Company’s portfolio of private placement bonds at $17.9 million which was equal to the aggregate par value of the private placement bonds. Accordingly, at June 30, 2016, the Company reported the private placement bonds at $17.9 million. Impaired non-purchased loans and leases Impaired purchased loans Foreclosed assets The following table presents additional information for the periods indicated about assets measured at fair value on a recurring basis and for which the Company has utilized Level 3 inputs to determine fair value. Investment Securities AFS (Dollars in Balance – December 31, 2015 $ 18,504 Total realized gains (losses) included in earnings — Total unrealized gains (losses) included in comprehensive income (48 ) Paydowns and maturities (565 ) Sales — Transfers in and/or out of Level 3 — Balance – June 30, 2016 $ 17,891 Balance – December 31, 2014 $ 19,401 Total realized gains (losses) included in earnings — Total unrealized gains (losses) included in comprehensive income (271 ) Paydowns and maturities (373 ) Sales — Transfers in and/or out of Level 3 — Balance – June 30, 2015 $ 18,757

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	11. Fair Value of Financial Instruments The following methods and assumptions were used to estimate the fair value of financial instruments. Cash and due from banks Investment securities Loans and leases Deposit liabilities Repurchase agreements Other borrowed funds Subordinated notes and debentures Off-balance sheet instruments The fair values of certain of these instruments were calculated by discounting expected cash flows, which contain numerous uncertainties and involve significant judgments by management. Fair value is the estimated amount at which financial assets or liabilities could be exchanged in a current transaction between willing parties other than in a forced or liquidation sale. Because no market exists for certain of these financial instruments and because management does not intend to sell these financial instruments, the estimated fair values may differ materially from the values which the respective financial instruments could be sold individually or in the aggregate. The following table presents the carrying amounts and estimated fair values as of the dates indicated and the fair value hierarchy of the Company’s financial instruments. June 30, 2016 December 31, 2015 Fair Value Hierarchy Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value (Dollars in thousands) Financial assets: Cash and cash equivalents Level 1 $ 806,526 $ 806,526 $ 90,988 $ 90,988 Investment securities AFS Levels 2 and 3 824,399 824,399 602,348 602,348 Loans and leases, net of ALLL Level 3 9,664,871 9,556,453 8,273,817 8,165,123 Financial liabilities: Demand, savings and interest bearing transaction deposits Level 1 $ 6,783,806 $ 6,783,806 $ 5,532,986 $ 5,532,986 Time deposits Level 2 3,411,266 3,433,352 2,438,482 2,456,323 Repurchase agreements with customers Level 1 53,997 53,997 65,800 65,800 Other borrowings Level 2 42,053 43,420 204,540 205,918 Subordinated notes Level 2 222,324 232,446 — — Subordinated debentures Level 2 117,962 91,037 117,685 77,534

Repurchase Agreements With Cust

Repurchase Agreements With Customers	6 Months Ended
	Jun. 30, 2016
Brokers And Dealers [Abstract]
Repurchase Agreements With Customers	12. Repurchase Agreements With Customers At June 30, 2016 and December 31, 2015, securities sold under agreements to repurchase (“repurchase agreements”) totaled $54.0 million and $65.8 million, respectively. Securities utilized as collateral for repurchase agreements are primarily U.S. Government agency mortgage-backed securities and are maintained by the Company’s safekeeping agents. These securities are reviewed by the Company on a daily basis, and the Company may be required to provide additional collateral due to changes in the fair market value of these securities. The terms of the Company’s repurchase agreements are continuous but may be cancelled at any time by the Company or the customer.

Changes in and Reclassification

Changes in and Reclassifications From Accumulated Other Comprehensive Income ("AOCI")	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Changes in and Reclassifications From Accumulated Other Comprehensive Income ("AOCI")	13. Changes In and Reclassifications From Accumulated Other Comprehensive Income (“AOCI”) The following table presents changes in AOCI for the periods indicated. Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 (Dollars in thousands) Beginning balance of AOCI – unrealized gains and losses on investment securities AFS $ 10,431 $ 14,367 $ 7,959 $ 14,132 Other comprehensive income (loss): Unrealized gains and losses on investment securities AFS 6,187 (10,091 ) 10,382 (7,600 ) Tax effect of unrealized gains and losses on investment securities AFS (1,512 ) 3,844 (3,235 ) 3,157 Amounts reclassified from AOCI — (85 ) — (2,618 ) Tax effect of amounts reclassified from AOCI — 33 — 997 Total other comprehensive income (loss) 4,675 (6,299 ) 7,147 (6,064 ) Ending balance of AOCI – unrealized gains and losses on investment securities AFS $ 15,106 $ 8,068 $ 15,106 $ 8,068 Amounts reclassified from AOCI are included in net gains on investment securities and the tax effect of amounts reclassified from AOCI are included in provision for income tax in the consolidated statements of income. The amounts reclassified from AOCI relate entirely to unrealized gains/losses on investment securities AFS that were sold during the periods indicated.

Other Operating Expenses

Other Operating Expenses	6 Months Ended
	Jun. 30, 2016
Other Income And Expenses [Abstract]
Other Operating Expenses	14. Other Operating Expenses The following table is a summary of other operating expenses for the periods indicated. Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 (Dollars in thousands) Salaries and employee benefits $ 24,921 $ 22,646 $ 48,282 $ 45,243 Net occupancy and equipment 8,388 7,344 16,918 14,635 Other operating expenses: Professional and outside services 4,342 2,526 7,563 6,912 Postage and supplies 1,073 1,014 2,131 1,929 Advertising and public relations 1,486 586 2,602 1,169 Telecommunication services 1,703 1,616 3,456 2,964 Software and data processing 1,087 766 1,593 1,515 ATM expense 830 543 1,709 1,251 Travel and meals 1,568 821 3,072 1,617 FDIC insurance 1,200 900 2,400 1,650 FDIC and state assessments 340 331 679 641 Loan collection and repossession expense 683 1,020 1,720 2,753 Writedowns of foreclosed and other assets 590 235 1,260 2,427 Amortization of intangibles 1,557 1,640 3,283 3,236 FHLB prepayment penalty — — — 2,480 Other 1,160 1,736 1,946 3,486 Total non-interest expense $ 50,928 $ 43,724 $ 98,614 $ 93,908

Recent and Proposed Accounting

Recent and Proposed Accounting Pronouncements	6 Months Ended
	Jun. 30, 2016
Accounting Changes And Error Corrections [Abstract]
Recent and Proposed Accounting Pronouncements	15. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers.” In April 2015, FASB issued ASU 2015-03, “Interest – Imputation of Interest (Subtopic 835-30) – Simplifying the Presentation of Debt Issuance Costs.” In January 2016, FASB issued ASU 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities.” In February 2016, FASB issued ASU 2016-02, “Leases (Topic 842) In March 2016, FASB issued ASU 2016-09 “Improvements to Employee Share-Based Payment Accounting.” In June 2016, FASB issued ASU 2016-13 “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments”

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	16. Subsequent Events On July 20, 2016, the Company completed its acquisition of C&S and its wholly-owned bank subsidiary, Community & Southern Bank, in a transaction valued at approximately $800.3 million. Pursuant to the terms of the merger agreement, the Company issued approximately 20,200,000 shares of its common stock (plus cash in lieu of fractional shares) to C&S stockholders. Additionally, the Company issued approximately 784,000 shares of its common stock (net of shares withheld for taxes) to holders of outstanding C&S stock options, restricted stock units, deferred stock units and warrants in satisfaction of all outstanding C&S equity awards. The acquisition of C&S provides the Company with 46 banking offices throughout Georgia and one banking office in Jacksonville, Florida. At June 30, 2016, C&S had approximately $3.9 billion in total assets, approximately $3.1 billion in total loans, approximately $3.3 billion in total deposits and approximately $490 million in total stockholders’ equity. Due to the timing of the C&S acquisition, the Company is continuing its evaluation of the fair value adjustments necessary to adjust the acquired assets and assumed liabilities to estimated fair value, as well as the related intangible assets associated with the transaction. The acquired assets and assumed liabilities, fair value adjustments and required supplemental pro forma information will be disclosed in subsequent filings. On July 21, 2016, the Company completed its acquisition of C1 and its wholly-owned bank subsidiary, C1 Bank, in a transaction valued at approximately $376.1 million. Pursuant to the terms of the merger agreement and the subsequent sale of certain C1 Bank loans, the Company issued approximately 9,371,000 shares of its common stock (plus cash in lieu of fractional and de minimis shares). The acquisition of C1 provides the Company with 33 banking offices throughout the west coast of Florida and in Miami-Dade and Orange counties. At June 30, 2016, C1 had approximately $1.7 billion in total assets, approximately $1.4 billion in total loans, approximately $1.3 billion in total deposits and approximately $210 million in total stockholders’ equity. Due to the timing of the C1 acquisition, the Company is continuing its evaluation of the fair value adjustments necessary to adjust the acquired assets and assumed liabilities to estimated fair value, as well as the related intangible assets associated with the transaction. The acquired assets and assumed liabilities, fair value adjustments and required supplemental pro forma information will be disclosed in subsequent filings.

Earnings Per Common Share ("E25

Earnings Per Common Share ("EPS") (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Schedule of Calculation of Numerator and Denominator in Basic and Diluted Earnings Per Share	The following table presents the computation of basic and diluted EPS for the periods indicated. Three Months Ended Six Months Ended June 30, June 30, 2016 2015 2016 2015 (In thousands, except per share amounts) Numerator: Distributed earnings allocated to common stockholders $ 14,061 $ 11,713 $ 27,664 $ 22,126 Undistributed earnings allocated to common stockholders 40,413 33,063 78,498 62,544 Net income available to common stockholders $ 54,474 $ 44,776 $ 106,162 $ 84,670 Denominator: Denominator for basic EPS – weighted-average common shares 90,730 86,786 90,708 85,251 Effect of dilutive securities – stock options 558 729 560 750 Denominator for diluted EPS – weighted-average common shares and assumed conversions 91,288 87,515 91,268 86,001 Basic EPS $ 0.60 $ 0.52 $ 1.17 $ 0.99 Diluted EPS $ 0.60 $ 0.51 $ 1.16 $ 0.98

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2016
Investments Debt And Equity Securities [Abstract]
Summary of Amortized Cost and Estimated Fair Value of Investment Securities	The following table presents the amortized cost and estimated fair value of investment securities AFS as of the dates indicated. The Company’s investment in the “CRA qualified investment fund” includes shares held in a mutual fund that qualifies under the Community Reinvestment Act of 1977 for community reinvestment purposes. The Company’s holdings of “other equity securities” include Federal Home Loan Bank of Dallas (“FHLB”) and First National Banker’s Bankshares, Inc. (“FNBB”) shares which do not have readily determinable fair values and are carried at cost. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (Dollars in thousands) June 30, 2016: Obligations of state and political subdivisions $ 584,184 $ 18,921 $ (15 ) $ 603,090 U.S. Government agency securities 206,234 4,382 (60 ) 210,556 Corporate obligations 3,554 — — 3,554 CRA qualified investment fund 1,049 12 — 1,061 Other equity securities 6,138 — — 6,138 Total $ 801,159 $ 23,315 $ (75 ) $ 824,399 December 31, 2015: Obligations of state and political subdivisions $ 415,095 $ 12,321 $ (138 ) $ 427,278 U.S. Government agency securities 146,265 1,720 (1,035 ) 146,950 Corporate obligations 3,562 — — 3,562 CRA qualified investment fund 1,038 — (10 ) 1,028 Other equity securities 23,530 — — 23,530 Total $ 589,490 $ 14,041 $ (1,183 ) $ 602,348
Gross Unrealized Losses and Estimated Fair Value of Investment Securities	The following table shows estimated fair value of investment securities AFS having gross unrealized losses and the amount of such unrealized losses, aggregated by investment category and length of time that individual investment securities have been in a continuous unrealized loss position, as of the dates indicated. Less than 12 Months 12 Months or More Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses (Dollars in thousands) June 30, 2016: Obligations of state and political subdivisions $ 12,007 $ 3 $ 4,747 $ 11 $ 16,754 $ 14 U.S. Government agency securities 16,959 55 150 6 17,109 61 Total temporarily impaired securities $ 28,966 $ 58 $ 4,897 $ 17 $ 33,863 $ 75 December 31, 2015: Obligations of state and political subdivisions $ 18,018 $ 114 $ 6,167 $ 24 $ 24,185 $ 138 U.S. Government agency securities 72,671 930 4,381 105 77,052 1,035 CRA qualified investment fund 1,029 10 — — 1,029 10 Total temporarily impaired securities $ 91,718 $ 1,054 $ 10,548 $ 129 $ 102,266 $ 1,183
Amortized Cost and Estimated Fair Value of Investment Securities AFS by Maturity or Estimated Date of Repayment	The following table shows the amortized cost and estimated fair value of investment securities AFS by maturity or estimated date of repayment as of the date indicated. June 30, 2016 Maturity or Estimated Repayment Amortized Cost Estimated Fair Value (Dollars in thousands) One year or less $ 36,283 $ 36,803 After one year to five years 128,770 131,296 After five years to ten years 181,074 186,674 After ten years 455,032 469,626 Total $ 801,159 $ 824,399
Sales Activities of Company's Investment Securities AFS are Summarized	The following table is a summary of sales activities in the Company’s investment securities AFS for the periods indicated. Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 (Dollars in thousands) Sales proceeds $ — $ 2,660 $ — $ 32,777 Gross realized gains 85 2,619 Gross realized losses — — — (1 ) Net gains on investment securities $ — $ 85 $ — $ 2,618

Allowance for Loan and Lease 27

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators (Tables)	6 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Schedule of Activity Within Allowance for Loan and Lease Losses	The following table is a summary of activity within the ALLL for the periods indicated. Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 (Dollars in thousands) Beginning balance $ 61,760 $ 54,147 $ 60,854 $ 52,918 Non-purchased loans and leases charged off (1,218 ) (1,496 ) (2,565 ) (5,575 ) Recoveries of non-purchased loans and leases previously charged off 191 198 444 506 Net non-purchased loans and leases charged off (1,027 ) (1,298 ) (2,121 ) (5,069 ) Purchased loans charged off (470 ) (702 ) (535 ) (2,115 ) Recoveries of purchased loans previously charged off 36 294 84 392 Net purchased loans charged off (434 ) (408 ) (451 ) (1,723 ) Net charge-offs - total loans and leases (1,461 ) (1,706 ) (2,572 ) (6,792 ) Provision for loan and lease losses: Non-purchased loans and leases 4,400 3,900 6,400 8,900 Purchased loans 434 408 451 1,723 Total provision 4,834 4,308 6,851 10,623 Ending balance $ 65,133 $ 56,749 $ 65,133 $ 56,749 ALLL allocated to non-purchased loans and leases $ 63,933 $ 56,749 $ 63,933 $ 56,749 ALLL allocated to purchased loans 1,200 — 1,200 — Total ALLL $ 65,133 $ 56,749 $ 65,133 $ 56,749
Summary of Company's Allowance for Loan and Lease Losses	The following tables are a summary of the Company’s ALLL for the periods indicated. Beginning Balance Charge-offs Recoveries Provision Ending Balance (Dollars in thousands) Three months ended June 30, 2016: Real estate: Residential 1-4 family $ 9,429 $ (13 ) $ 13 $ 670 $ 10,099 Non-farm/non-residential 18,761 — — 357 19,118 Construction/land development 15,259 — 49 2,188 17,496 Agricultural 3,684 — — 71 3,755 Multifamily residential 3,914 — 14 (267 ) 3,661 Commercial and industrial 3,399 (31 ) 6 416 3,790 Consumer 707 (35 ) 2 38 712 Direct financing leases 4,235 (808 ) 5 660 4,092 Other 1,172 (331 ) 102 267 1,210 Purchased loans 1,200 (470 ) 36 434 1,200 Total $ 61,760 $ (1,688 ) $ 227 $ 4,834 $ 65,133 Six months ended June 30, 2016: Real estate: Residential 1-4 family $ 8,672 $ (256 ) $ 37 $ 1,646 $ 10,099 Non-farm/non-residential 16,796 (12 ) — 2,334 19,118 Construction/land development 18,176 (20 ) 51 (711 ) 17,496 Agricultural 3,388 (7 ) — 374 3,755 Multifamily residential 3,031 — 14 616 3,661 Commercial and industrial 2,574 (42 ) 39 1,219 3,790 Consumer 707 (68 ) 14 59 712 Direct financing leases 3,835 (1,468 ) 16 1,709 4,092 Other 2,475 (692 ) 273 (846 ) 1,210 Purchased loans 1,200 (535 ) 84 451 1,200 Total $ 60,854 $ (3,100 ) $ 528 $ 6,851 $ 65,133 Beginning Balance Charge-offs Recoveries Provision Ending Balance (Dollars in thousands) Three months ended June 30, 2015: Real estate: Residential 1-4 family $ 5,657 $ (92 ) $ 10 $ 26 $ 5,601 Non-farm/non-residential 17,766 (119 ) 5 580 18,232 Construction/land development 17,580 (469 ) — 2,037 19,148 Agricultural 2,526 — — (66 ) 2,460 Multifamily residential 2,423 (208 ) — 671 2,886 Commercial and industrial 3,301 (93 ) 23 18 3,249 Consumer 824 (24 ) 21 4 825 Direct financing leases 3,258 (155 ) 7 444 3,554 Other 812 (336 ) 132 186 794 Purchased loans — (702 ) 294 408 — Total $ 54,147 $ (2,198 ) $ 492 $ 4,308 $ 56,749 Six months ended June 30, 2015: Real estate: Residential 1-4 family $ 5,482 $ (621 ) $ 21 $ 719 $ 5,601 Non-farm/non-residential 17,190 (324 ) 17 1,349 18,232 Construction/land development 15,960 (771 ) 37 3,922 19,148 Agricultural 2,558 (13 ) — (85 ) 2,460 Multifamily residential 2,147 (208 ) — 947 2,886 Commercial and industrial 4,873 (2,540 ) 39 877 3,249 Consumer 818 (69 ) 42 34 825 Direct financing leases 2,989 (341 ) 13 893 3,554 Other 901 (688 ) 337 244 794 Purchased loans — (2,115 ) 392 1,723 — Total $ 52,918 $ (7,690 ) $ 898 $ 10,623 $ 56,749
Summary of Allowance for Loan and Lease Losses and Recorded Investment in Non-Purchased Loans and Leases	The following table is a summary of the Company’s ALLL for non-purchased loans and leases and recorded investment in non-purchased loans and leases as of the dates indicated. ALLL for Non-Purchased Loans and Leases Non-Purchased Loans and Leases ALLL for Individually Evaluated Impaired Loans and Leases ALLL for All Other Loans and Leases Total ALLL (1) Individually Evaluated Impaired Loans and Leases All Other Loans and Leases Total Loans and Leases (Dollars in thousands) June 30, 2016: Real estate: Residential 1-4 family $ 267 $ 9,832 $ 10,099 $ 2,092 $ 406,142 $ 408,234 Non-farm/non-residential 21 19,097 19,118 1,033 2,619,419 2,620,452 Construction/land development 46 17,450 17,496 280 3,600,475 3,600,755 Agricultural 468 3,287 3,755 1,328 88,979 90,307 Multifamily residential — 3,661 3,661 — 591,792 591,792 Commercial and industrial 508 3,282 3,790 709 254,003 254,712 Consumer 5 707 712 45 28,492 28,537 Direct financing leases — 4,092 4,092 — 133,775 133,775 Other — 1,210 1,210 6 486,330 486,336 Total $ 1,315 $ 62,618 $ 63,933 $ 5,493 $ 8,209,407 $ 8,214,900 December 31, 2015: Real estate: Residential 1-4 family $ 297 $ 8,375 $ 8,672 $ 2,030 $ 348,224 $ 350,254 Non-farm/non-residential 31 16,765 16,796 940 2,009,926 2,010,866 Construction/land development 48 18,128 18,176 5,556 2,820,019 2,825,575 Agricultural 475 2,913 3,388 1,313 73,127 74,440 Multifamily residential — 3,031 3,031 83 440,745 440,828 Commercial and industrial 487 2,087 2,574 714 230,567 231,281 Consumer 2 705 707 24 27,721 27,745 Direct financing leases — 3,835 3,835 — 147,735 147,735 Other — 2,475 2,475 7 419,903 419,910 Total $ 1,340 $ 58,314 $ 59,654 $ 10,667 $ 6,517,967 $ 6,528,634 (1)
Schedule of Impaired Non-purchased Loans and Leases, FDIC Loss Share Agreements	The following table is a summary of impaired non-purchased loans and leases as of and for the three and six months ended June 30, 2016. Principal Balance Net Charge-offs to Date Principal Balance, Net of Charge-offs Specific ALLL Weighted Average Carrying Value – Three Months Ended June 30, 2016 Weighted Average Carrying Value – Six Months Ended June 30, 2016 (Dollars in thousands) Impaired loans and leases for which there is a related ALLL: Real estate: Residential 1-4 family $ 2,766 $ (1,763 ) $ 1,003 $ 267 $ 1,256 $ 1,207 Non-farm/non-residential 1,087 (914 ) 173 21 113 93 Construction/land development 118 — 118 46 119 120 Agricultural 1,145 — 1,145 468 1,147 1,149 Commercial and industrial 829 (321 ) 508 508 514 511 Consumer 49 (15 ) 34 5 22 18 Total impaired loans and leases with a related ALLL 5,994 (3,013 ) 2,981 1,315 3,171 3,098 Impaired loans and leases for which there is not a related ALLL: Real estate: Residential 1-4 family 1,568 (479 ) 1,089 — 981 961 Non-farm/non-residential 1,058 (198 ) 860 — 861 869 Construction/land development 925 (763 ) 162 — 1,926 3,096 Agricultural 392 (209 ) 183 — 183 175 Multifamily residential 133 (133 ) — — 41 55 Commercial and industrial 251 (50 ) 201 — 201 204 Consumer 16 (5 ) 11 — 11 11 Other 6 — 6 — 6 7 Total impaired loans and leases without a related ALLL 4,349 (1,837 ) 2,512 — 4,210 5,378 Total impaired non-purchased loans and leases $ 10,343 $ (4,850 ) $ 5,493 $ 1,315 $ 7,381 $ 8,476 The following table is a summary of impaired non-purchased loans and leases as of and for the year ended December 31, 2015. Principal Balance Net Charge-offs to Date Principal Balance, Net of Charge-offs Specific ALLL Weighted Average Carrying Value – Year Ended December 31, 2015 (Dollars in thousands) Impaired loans and leases for which there is a related ALLL: Real estate: Residential 1-4 family $ 2,914 $ (1,804 ) $ 1,110 $ 297 $ 1,279 Non-farm/non-residential 962 (907 ) 55 31 129 Construction/land development 121 — 121 48 896 Agricultural 1,153 — 1,153 475 479 Commercial and industrial 825 (322 ) 503 487 404 Consumer 26 (15 ) 11 2 16 Total impaired loans and leases with a related ALLL 6,001 (3,048 ) 2,953 1,340 3,203 Impaired loans and leases for which there is not a related ALLL: Real estate: Residential 1-4 family 1,306 (386 ) 920 — 955 Non-farm/non-residential 1,083 (198 ) 885 — 1,137 Construction/land development 7,873 (2,438 ) 5,435 — 8,255 Agricultural 362 (202 ) 160 — 261 Multifamily residential 216 (133 ) 83 — 155 Commercial and industrial 261 (50 ) 211 — 141 Consumer 18 (5 ) 13 — 14 Other 7 — 7 — 7 Total impaired loans and leases without a related ALLL 11,126 (3,412 ) 7,714 — 10,925 Total impaired non-purchased loans and leases $ 17,127 $ (6,460 ) $ 10,667 $ 1,340 $ 14,128
Summary of Credit Quality Indicators for Loans and Leases, Including Purchased and Non-Purchased Loans and Leases	The following table is a summary of credit quality indicators for the Company’s non-purchased loans and leases as of the dates indicated. Satisfactory Moderate Watch Substandard Total (Dollars in thousands) June 30, 2016: Real estate: Residential 1-4 family (1) $ 399,027 $ — $ 4,095 $ 5,112 $ 408,234 Non-farm/non-residential 2,270,225 265,385 79,323 5,519 2,620,452 Construction/land development 3,302,321 286,631 10,362 1,441 3,600,755 Agricultural 51,010 28,270 9,362 1,665 90,307 Multifamily residential 542,211 46,668 1,857 1,056 591,792 Commercial and industrial 165,438 84,965 3,017 1,292 254,712 Consumer (1) 28,101 — 221 215 28,537 Direct financing leases 132,887 170 160 558 133,775 Other (1) 480,365 5,650 207 114 486,336 Total $ 7,371,585 $ 717,739 $ 108,604 $ 16,972 $ 8,214,900 December 31, 2015: Real estate: Residential 1-4 family (1) $ 342,083 $ — $ 2,946 $ 5,225 $ 350,254 Non-farm/non-residential 1,692,632 235,999 73,788 8,447 2,010,866 Construction/land development 2,553,368 256,655 8,916 6,636 2,825,575 Agricultural 40,538 22,799 8,909 2,194 74,440 Multifamily residential 400,848 35,080 4,079 821 440,828 Commercial and industrial 179,797 47,802 1,854 1,828 231,281 Consumer (1) 27,219 — 276 250 27,745 Direct financing leases 146,934 201 190 410 147,735 Other (1) 415,686 4,027 182 15 419,910 Total $ 5,799,105 $ 602,563 $ 101,140 $ 25,826 $ 6,528,634 (1) The Company does not risk rate its residential 1-4 family loans, its consumer loans, and certain “other” loans. However, for purposes of the above table, the Company considers such loans to be (i) satisfactory – if they are performing and less than 30 days past due, (ii) watch – if they are performing and 30 to 89 days past due or (iii) substandard – if they are nonperforming or 90 days or more past due. The following table is a summary of credit quality indicators for the Company’s purchased loans as of the dates indicated. Purchased Loans Without Evidence of Credit Deterioration at Acquisition Purchased Loans With Evidence of Credit Deterioration at Acquisition Total Purchased FV 33 FV 44 FV 55 FV 36 FV 77 FV 66 FV 88 Loans (Dollars in thousands) June 30, 2016: Real estate: Residential 1-4 family $ 53,349 $ 88,447 $ 33,412 $ 73,753 $ 72 $ 68,805 $ 1,516 $ 319,354 Non-farm/non-residential 181,990 615,083 111,291 3,926 422 81,111 4,149 997,972 Construction/land development 11,660 9,356 5,960 3,366 22 6,822 88 37,274 Agricultural 3,353 4,889 999 472 — 3,522 — 13,235 Multifamily residential 16,641 59,309 24,998 824 13 2,661 — 104,446 Commercial and industrial 6,803 10,287 7,077 3,560 25 5,693 72 33,517 Consumer 551 125 29 3,757 — 200 — 4,662 Other 3,051 838 143 93 8 511 — 4,644 Total $ 277,398 $ 788,334 $ 183,909 $ 89,751 $ 562 $ 169,325 $ 5,825 $ 1,515,104 December 31, 2015: Real estate: Residential 1-4 family $ 59,497 $ 117,498 $ 38,888 $ 85,684 $ 351 $ 82,862 $ 2,172 $ 386,952 Non-farm/non-residential 209,542 693,707 122,652 5,039 363 99,681 4,563 1,135,547 Construction/land development 13,121 12,511 7,137 4,771 22 10,224 37 47,823 Agricultural 4,825 7,963 1,456 797 — 4,877 — 19,918 Multifamily residential 20,347 86,588 27,818 896 13 3,835 — 139,497 Commercial and industrial 8,912 29,001 9,244 5,649 20 7,185 511 60,522 Consumer 726 205 185 6,106 2 263 — 7,487 Other 3,944 3,316 212 243 — 576 — 8,291 Total $ 320,914 $ 950,789 $ 207,592 $ 109,185 $ 771 $ 209,503 $ 7,283 $ 1,806,037
Schedule of Aging Analysis Past Due Loans and Leases, Loans Purchased and Non-Purchased by FDIC Loss Share Agreements	The following table is an aging analysis of past due non-purchased loans and leases as of the dates indicated. 30-89 Days Past Due (1) 90 Days or More (2) Total Past Due Current (3) Total (Dollars in thousands) June 30, 2016: Real estate: Residential 1-4 family $ 4,677 $ 1,585 $ 6,262 $ 401,972 $ 408,234 Non-farm/non-residential 2,258 1,145 3,403 2,617,049 2,620,452 Construction/land development 3,531 224 3,755 3,597,000 3,600,755 Agricultural 1,372 183 1,555 88,752 90,307 Multifamily residential 736 — 736 591,056 591,792 Commercial and industrial 309 740 1,049 253,663 254,712 Consumer 219 22 241 28,296 28,537 Direct financing leases 419 492 911 132,864 133,775 Other — 108 108 486,228 486,336 Total $ 13,521 $ 4,499 $ 18,020 $ 8,196,880 $ 8,214,900 December 31, 2015: Real estate: Residential 1-4 family $ 2,793 $ 1,507 $ 4,300 $ 345,954 $ 350,254 Non-farm/non-residential 1,881 777 2,658 2,008,208 2,010,866 Construction/land development 1,043 5,645 6,688 2,818,887 2,825,575 Agricultural 1,780 243 2,023 72,417 74,440 Multifamily residential — 83 83 440,745 440,828 Commercial and industrial 823 751 1,574 229,707 231,281 Consumer 248 33 281 27,464 27,745 Direct financing leases 517 321 838 146,897 147,735 Other 8 7 15 419,895 419,910 Total $ 9,093 $ 9,367 $ 18,460 $ 6,510,174 $ 6,528,634 (1) Includes $1.4 million and $1.9 million at June 30, 2016 and December 31, 2015, respectively, of loans and leases on nonaccrual status. (2) All loans and leases greater than 90 days past due were on nonaccrual status at June 30, 2016 and December 31, 2015. (3) Includes $1.9 million and $2.3 million of loans and leases on nonaccrual status at June 30, 2016 and December 31, 2015, respectively. The following table is an aging analysis of past due purchased loans as of the dates indicated. 30-89 Days Past Due 90 Days or More Total Past Due Current Total Purchased Loans (Dollars in thousands) June 30, 2016: Real estate: Residential 1-4 family $ 6,492 $ 5,094 $ 11,586 $ 307,768 $ 319,354 Non-farm/non-residential 1,578 5,931 7,509 990,463 997,972 Construction/land development 412 816 1,228 36,046 37,274 Agriculture 130 353 483 12,752 13,235 Multifamily residential — 13 13 104,433 104,446 Commercial and industrial 661 1,084 1,745 31,772 33,517 Consumer 52 29 81 4,581 4,662 Other — — — 4,644 4,644 Total $ 9,325 $ 13,320 $ 22,645 $ 1,492,459 $ 1,515,104 Purchased loans without evidence of credit deterioration at date of acquisition $ 4,246 $ 3,193 $ 7,439 $ 1,332,515 $ 1,339,954 Purchased loans with evidence of credit deterioration at date of acquisition 5,079 10,127 15,206 159,944 175,150 Total $ 9,325 $ 13,320 $ 22,645 $ 1,492,459 $ 1,515,104 December 31, 2015: Real estate: Residential 1-4 family $ 9,042 $ 6,293 $ 15,335 $ 371,617 $ 386,952 Non-farm/non-residential 3,435 6,837 10,272 1,125,275 1,135,547 Construction/land development 919 1,255 2,174 45,649 47,823 Agriculture 106 356 462 19,456 19,918 Multifamily residential 299 — 299 139,198 139,497 Commercial and industrial 714 924 1,638 58,884 60,522 Consumer 101 41 142 7,345 7,487 Other 10 11 21 8,270 8,291 Total $ 14,626 $ 15,717 $ 30,343 $ 1,775,694 $ 1,806,037 Purchased loans without evidence of credit deterioration at date of acquisition $ 7,972 $ 2,743 $ 10,715 $ 1,578,536 $ 1,589,251 Purchased loans with evidence of credit deterioration at date of acquisition 6,654 12,974 19,628 197,158 216,786 Total $ 14,626 $ 15,717 $ 30,343 $ 1,775,694 $ 1,806,037

Supplemental Data for Cash Fl28

Supplemental Data for Cash Flows (Tables)	6 Months Ended
	Jun. 30, 2016
Supplemental Cash Flow Elements [Abstract]
Schedule of Supplemental Cash Flow Information	The following table provides supplemental cash flow information for the periods indicated. Six Months Ended June 30, 2016 2015 (Dollars in thousands) Cash paid during the period for: Interest $ 20,073 $ 13,031 Taxes 71,904 34,024 Supplemental schedule of non-cash investing and financing activities: Net change in unrealized gains/losses on investment securities AFS 10,382 (10,218 ) Loans transferred to foreclosed assets 10,236 9,797 Loans advanced for sales of foreclosed assets 127 — Unsettled AFS investment security purchases 27,388 4,453 Unsettled loan sales — 14,361 Unsettled loan purchases 14,428 18,269 Common stock issued in merger and acquisition transaction — 238,476

Guarantees and Commitments (Tab

Guarantees and Commitments (Tables)	6 Months Ended
	Jun. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Contractual Maturities	At June 30, 2016, the Company had outstanding commitments totaling $7.35 billion to extend credit, consisting primarily of loans closed but not yet funded. The following table shows, as of the date indicated, the contractual maturities of such outstanding commitments. Contractual Maturities at June 30, 2016 Maturity Amount (Dollars in thousands) 2016 $ 200,997 2017 1,010,841 2018 2,603,175 2019 2,123,899 2020 1,286,274 Thereafter 124,541 Total $ 7,349,727

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Option Activity	The following table summarizes stock option activity for the period indicated. Options Weighted- Average Exercise Price/Share Weighted-Average Remaining Contractual Life (in years) Aggregate Intrinsic Value (in thousands) Six Months Ended June 30, 2016: Outstanding – December 31, 2015 2,034,476 $ 34.50 Granted 6,683 45.89 Exercised (53,770 ) 16.76 Forfeited (63,125 ) 39.35 Outstanding – June 30, 2016 1,924,264 34.94 5.2 $ 14,822 (1) Fully vested and exercisable – June 30, 2016 402,855 $ 15.03 3.7 $ 9,061 (1) Expected to vest in future periods 1,428,628 Fully vested and expected to vest – June 30, 2016 (2) 1,831,483 $ 34.38 5.1 $ 14,707 (1) (1) Based on closing price of $37.52 per share on June 30, 2016. (2) At June 30, 2016, the Company estimated that outstanding options to purchase 92,781 shares of its common stock would not vest and would be forfeited prior to their vesting date.
Summary of Non-Vested Restricted Stock Activity	The following table summarizes non-vested restricted stock activity for the period indicated. Six Months Ended June 30, 2016 Outstanding – December 31, 2015 435,475 Granted 213,907 Forfeited (13,986 ) Vested — Outstanding – June 30, 2016 635,396 Weighted-average grant date fair value $ 35.08

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Assets and Liabilities at Fair Value	The following table sets forth the Company’s assets, as of the dates indicated, that are accounted for at fair value. Level 1 Level 2 Level 3 Total (Dollars in thousands) June 30, 2016: Investment securities AFS (1) Obligations of state and political subdivisions $ — $ 585,199 $ 17,891 603,090 U.S. Government agency securities — 210,556 — 210,556 Corporate obligations — 3,554 — 3,554 CRA qualified investment fund 1,061 — — 1,061 Total investment securities AFS 1,061 799,309 17,891 818,261 Impaired non-purchased loans and leases — — 4,178 4,178 Impaired purchased loans — — 6,387 6,387 Foreclosed assets — — 23,328 23,328 Total assets at fair value $ 1,061 $ 799,309 $ 51,784 $ 852,154 December 31, 2015: Investment securities AFS (1) Obligations of state and political subdivisions $ — $ 408,774 $ 18,504 $ 427,278 U.S. Government agency securities — 146,950 — 146,950 Corporate obligations — 3,562 — 3,562 CRA qualified investment fund 1,028 — — 1,028 Total investment securities AFS 1,028 559,286 18,504 578,818 Impaired non-purchased loans and leases — — 9,327 9,327 Impaired purchased loans — — 8,054 8,054 Foreclosed assets — — 22,870 22,870 Total assets at fair value $ 1,028 $ 559,286 $ 58,755 $ 619,069 (1) Does not include $6.1 million at June 30, 2016 and $23.5 million at December 31, 2015 of FHLB and FNBB equity securities that do not have readily determinable fair values and are carried at cost.
Schedule of Information Related to Level 3 Non-Recurring Fair Value Measurements	The following table presents information related to Level 3 non-recurring fair value measurements as of the date indicated. Description Fair Value at June 30, 2016 Technique Unobservable Inputs (Dollars in thousands) Impaired non-purchased loans and leases $ 4,178 Third party appraisal (1) or discounted cash flows 1. Management discount based on underlying collateral characteristics and market conditions 2. Life of Loan Impaired purchased loans $ 6,387 Third party appraisal (1) and/or discounted cash flows 1. Management discount based on underlying collateral characteristics and market conditions 2. Life of Loan Foreclosed assets $ 23,328 Third party appraisal, (1) broker price opinions and/or discounted cash flows 1. Management discount based on underlying collateral characteristics and market conditions 2. Discount rate 3. Holding period (1) The Company utilizes valuation techniques consistent with the market, cost, and income approaches, or a combination thereof in determining fair value.
Assets Measured at Fair Value on Recurring Basis Utilizing Level 3 Inputs	The following table presents additional information for the periods indicated about assets measured at fair value on a recurring basis and for which the Company has utilized Level 3 inputs to determine fair value. Investment Securities AFS (Dollars in Balance – December 31, 2015 $ 18,504 Total realized gains (losses) included in earnings — Total unrealized gains (losses) included in comprehensive income (48 ) Paydowns and maturities (565 ) Sales — Transfers in and/or out of Level 3 — Balance – June 30, 2016 $ 17,891 Balance – December 31, 2014 $ 19,401 Total realized gains (losses) included in earnings — Total unrealized gains (losses) included in comprehensive income (271 ) Paydowns and maturities (373 ) Sales — Transfers in and/or out of Level 3 — Balance – June 30, 2015 $ 18,757

Fair Value of Financial Instr32

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Estimated Fair Values of Financial Instruments	The following table presents the carrying amounts and estimated fair values as of the dates indicated and the fair value hierarchy of the Company’s financial instruments. June 30, 2016 December 31, 2015 Fair Value Hierarchy Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value (Dollars in thousands) Financial assets: Cash and cash equivalents Level 1 $ 806,526 $ 806,526 $ 90,988 $ 90,988 Investment securities AFS Levels 2 and 3 824,399 824,399 602,348 602,348 Loans and leases, net of ALLL Level 3 9,664,871 9,556,453 8,273,817 8,165,123 Financial liabilities: Demand, savings and interest bearing transaction deposits Level 1 $ 6,783,806 $ 6,783,806 $ 5,532,986 $ 5,532,986 Time deposits Level 2 3,411,266 3,433,352 2,438,482 2,456,323 Repurchase agreements with customers Level 1 53,997 53,997 65,800 65,800 Other borrowings Level 2 42,053 43,420 204,540 205,918 Subordinated notes Level 2 222,324 232,446 — — Subordinated debentures Level 2 117,962 91,037 117,685 77,534

Changes in and Reclassificati33

Changes in and Reclassifications From Accumulated Other Comprehensive Income ("AOCI") (Tables)	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income	The following table presents changes in AOCI for the periods indicated. Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 (Dollars in thousands) Beginning balance of AOCI – unrealized gains and losses on investment securities AFS $ 10,431 $ 14,367 $ 7,959 $ 14,132 Other comprehensive income (loss): Unrealized gains and losses on investment securities AFS 6,187 (10,091 ) 10,382 (7,600 ) Tax effect of unrealized gains and losses on investment securities AFS (1,512 ) 3,844 (3,235 ) 3,157 Amounts reclassified from AOCI — (85 ) — (2,618 ) Tax effect of amounts reclassified from AOCI — 33 — 997 Total other comprehensive income (loss) 4,675 (6,299 ) 7,147 (6,064 ) Ending balance of AOCI – unrealized gains and losses on investment securities AFS $ 15,106 $ 8,068 $ 15,106 $ 8,068

Other Operating Expenses (Table

Other Operating Expenses (Tables)	6 Months Ended
	Jun. 30, 2016
Other Income And Expenses [Abstract]
Summary of Other Operating Expenses	The following table is a summary of other operating expenses for the periods indicated. Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 (Dollars in thousands) Salaries and employee benefits $ 24,921 $ 22,646 $ 48,282 $ 45,243 Net occupancy and equipment 8,388 7,344 16,918 14,635 Other operating expenses: Professional and outside services 4,342 2,526 7,563 6,912 Postage and supplies 1,073 1,014 2,131 1,929 Advertising and public relations 1,486 586 2,602 1,169 Telecommunication services 1,703 1,616 3,456 2,964 Software and data processing 1,087 766 1,593 1,515 ATM expense 830 543 1,709 1,251 Travel and meals 1,568 821 3,072 1,617 FDIC insurance 1,200 900 2,400 1,650 FDIC and state assessments 340 331 679 641 Loan collection and repossession expense 683 1,020 1,720 2,753 Writedowns of foreclosed and other assets 590 235 1,260 2,427 Amortization of intangibles 1,557 1,640 3,283 3,236 FHLB prepayment penalty — — — 2,480 Other 1,160 1,736 1,946 3,486 Total non-interest expense $ 50,928 $ 43,724 $ 98,614 $ 93,908

Organization and Principles o35

Organization and Principles of Consolidation - Additional Information (Detail)	Jul. 22, 2016Office	Jul. 21, 2016Office	Jul. 20, 2016Office	Jun. 30, 2016TrustOffice
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Ownership interest owned finance subsidiary business trusts				100.00%
Number of finance subsidiary trusts | Trust				8
Number of offices				177
Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of bank offices	256
Arkansas [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of offices				83
Georgia [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of offices				28
Georgia [Member] | Subsequent Event [Member] | Community & Southern Holdings, Inc. [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of bank offices			46
North Carolina [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of offices				25
Texas [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of offices				22
Florida [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of offices				10
Florida [Member] | Subsequent Event [Member] | Community & Southern Holdings, Inc. [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of bank offices			1
Florida [Member] | Subsequent Event [Member] | C1 Financial, Inc. [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of bank offices		33
Alabama [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of offices				3
South Carolina [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of offices				2
New York [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of offices				2
California [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of offices				2

Earnings Per Common Share ("E36

Earnings Per Common Share ("EPS") - Additional Information (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Options to purchase shares of the Company's common stock	648,293	0	654,076	531,500
Weighted-average exercise price, per share	$ 53.80		$ 54.92	$ 40.30

Earnings Per Common Share ("E37

Earnings Per Common Share ("EPS") - Schedule of Calculation of Numerator and Denominator in Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Distributed earnings allocated to common stockholders	$ 14,061	$ 11,713	$ 27,664	$ 22,126
Undistributed earnings allocated to common stockholders	40,413	33,063	78,498	62,544
Net income available to common stockholders	$ 54,474	$ 44,776	$ 106,162	$ 84,670
Denominator for basic EPS – weighted-average common shares	90,730	86,786	90,708	85,251
Effect of dilutive securities – stock options	558	729	560	750
Denominator for diluted EPS – weighted-average common shares and assumed conversions	91,288	87,515	91,268	86,001
Basic EPS	$ 0.60	$ 0.52	$ 1.17	$ 0.99
Diluted EPS	$ 0.60	$ 0.51	$ 1.16	$ 0.98

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Values of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 801,159	$ 589,490
Gross Unrealized Gains	23,315	14,041
Gross Unrealized Losses	(75)	(1,183)
Estimated Fair Value	824,399	602,348
Obligations of State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	584,184	415,095
Gross Unrealized Gains	18,921	12,321
Gross Unrealized Losses	(15)	(138)
Estimated Fair Value	603,090	427,278
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	206,234	146,265
Gross Unrealized Gains	4,382	1,720
Gross Unrealized Losses	(60)	(1,035)
Estimated Fair Value	210,556	146,950
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,554	3,562
Estimated Fair Value	3,554	3,562
CRA Qualified Investment Fund [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,049	1,038
Gross Unrealized Gains	12
Gross Unrealized Losses		(10)
Estimated Fair Value	1,061	1,028
Other Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,138	23,530
Estimated Fair Value	$ 6,138	$ 23,530

Investment Securities - Gross U

Investment Securities - Gross Unrealized Losses and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired investment securities, Estimated Fair Value, Less than 12 Months	$ 28,966	$ 91,718
Total temporarily impaired investment securities, Unrealized Losses, Less than 12 Months	58	1,054
Total temporarily impaired investment securities, Estimated Fair Value, 12 Months or More	4,897	10,548
Total temporarily impaired investment securities, Unrealized Losses, 12 Months or More	17	129
Total temporarily impaired securities, Estimated Fair Value, Total	33,863	102,266
Total temporarily impaired securities, Unrealized Losses, Total	75	1,183
Obligations of State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired investment securities, Estimated Fair Value, Less than 12 Months	12,007	18,018
Total temporarily impaired investment securities, Unrealized Losses, Less than 12 Months	3	114
Total temporarily impaired investment securities, Estimated Fair Value, 12 Months or More	4,747	6,167
Total temporarily impaired investment securities, Unrealized Losses, 12 Months or More	11	24
Total temporarily impaired securities, Estimated Fair Value, Total	16,754	24,185
Total temporarily impaired securities, Unrealized Losses, Total	14	138
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired investment securities, Estimated Fair Value, Less than 12 Months	16,959	72,671
Total temporarily impaired investment securities, Unrealized Losses, Less than 12 Months	55	930
Total temporarily impaired investment securities, Estimated Fair Value, 12 Months or More	150	4,381
Total temporarily impaired investment securities, Unrealized Losses, 12 Months or More	6	105
Total temporarily impaired securities, Estimated Fair Value, Total	17,109	77,052
Total temporarily impaired securities, Unrealized Losses, Total	$ 61	1,035
CRA Qualified Investment Fund [Member]
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired investment securities, Estimated Fair Value, Less than 12 Months		1,029
Total temporarily impaired investment securities, Unrealized Losses, Less than 12 Months		10
Total temporarily impaired securities, Estimated Fair Value, Total		1,029
Total temporarily impaired securities, Unrealized Losses, Total		$ 10

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities AFS by Maturity or Estimated Date of Repayment (Detail) $ in Thousands	Jun. 30, 2016USD ($)
Investments Debt And Equity Securities [Abstract]
Amortized Cost, One year or less	$ 36,283
Amortized Cost, After one year to five years	128,770
Amortized Cost, After five years to ten years	181,074
Amortized Cost, After ten years	455,032
Total, Amortized Cost	801,159
Estimated Fair Value, One year or less	36,803
Estimated Fair Value, After one year to five years	131,296
Estimated Fair Value, After five years to ten years	186,674
Estimated Fair Value, After ten years	469,626
Total, Estimated Fair Value	$ 824,399

Investment Securities - Sales A

Investment Securities - Sales Activities of Company's Investment Securities AFS are Summarized (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2015
Investments Debt And Equity Securities [Abstract]
Sales proceeds	$ 0	$ 2,660	$ 32,777
Gross realized gains	0	85	2,619
Gross realized losses	0		(1)
Net gains on investment securities	$ 0	$ 85	$ 2,618

Allowance for Loan and Lease 42

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Schedule of Activity Within Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015	Dec. 31, 2015	[1]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 61,760		$ 54,147	$ 60,854		$ 52,918
Net charge-offs	(1,461)		(1,706)	(2,572)		(6,792)
Total provision	4,834		4,308	6,851		10,623
Ending balance	65,133		56,749	65,133		56,749
ALLL allocated to non-purchased loans and leases	63,933	[1]	56,749	63,933	[1]	56,749	$ 59,654
ALLL allocated to purchased loans	1,200			1,200
Total ALLL	65,133		56,749	65,133		56,749
Non-Purchased Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and leases charged off	(1,218)		(1,496)	(2,565)		(5,575)
Recoveries of loans and leases charged off	191		198	444		506
Net charge-offs	(1,027)		(1,298)	(2,121)		(5,069)
Total provision	4,400		3,900	6,400		8,900
Purchased Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and leases charged off	(470)		(702)	(535)		(2,115)
Recoveries of loans and leases charged off	36		294	84		392
Net charge-offs	(434)		(408)	(451)		(1,723)
Total provision	$ 434		$ 408	$ 451		$ 1,723
[1]	Excludes $1.2 million of ALLL allocated to the Company’s purchased loans at both June 30, 2016 and December 31, 2015

Allowance for Loan and Lease 43

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Summary of Company's Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 61,760	$ 54,147	$ 60,854	$ 52,918
Charge-offs	(1,688)	(2,198)	(3,100)	(7,690)
Recoveries	227	492	528	898
Provision	4,834	4,308	6,851	10,623
Ending balance	65,133	56,749	65,133	56,749
Real Estate [Member] | Residential 1-4 Family [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	9,429	5,657	8,672	5,482
Charge-offs	(13)	(92)	(256)	(621)
Recoveries	13	10	37	21
Provision	670	26	1,646	719
Ending balance	10,099	5,601	10,099	5,601
Real Estate [Member] | Non-Farm/Non-Residential [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	18,761	17,766	16,796	17,190
Charge-offs		(119)	(12)	(324)
Recoveries		5		17
Provision	357	580	2,334	1,349
Ending balance	19,118	18,232	19,118	18,232
Real Estate [Member] | Construction/Land Development [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	15,259	17,580	18,176	15,960
Charge-offs		(469)	(20)	(771)
Recoveries	49		51	37
Provision	2,188	2,037	(711)	3,922
Ending balance	17,496	19,148	17,496	19,148
Real Estate [Member] | Agricultural [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,684	2,526	3,388	2,558
Charge-offs			(7)	(13)
Provision	71	(66)	374	(85)
Ending balance	3,755	2,460	3,755	2,460
Real Estate [Member] | Multifamily Residential [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,914	2,423	3,031	2,147
Charge-offs		(208)		(208)
Recoveries	14		14
Provision	(267)	671	616	947
Ending balance	3,661	2,886	3,661	2,886
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,399	3,301	2,574	4,873
Charge-offs	(31)	(93)	(42)	(2,540)
Recoveries	6	23	39	39
Provision	416	18	1,219	877
Ending balance	3,790	3,249	3,790	3,249
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	707	824	707	818
Charge-offs	(35)	(24)	(68)	(69)
Recoveries	2	21	14	42
Provision	38	4	59	34
Ending balance	712	825	712	825
Direct Financing Leases [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	4,235	3,258	3,835	2,989
Charge-offs	(808)	(155)	(1,468)	(341)
Recoveries	5	7	16	13
Provision	660	444	1,709	893
Ending balance	4,092	3,554	4,092	3,554
Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	1,172	812	2,475	901
Charge-offs	(331)	(336)	(692)	(688)
Recoveries	102	132	273	337
Provision	267	186	(846)	244
Ending balance	1,210	794	1,210	794
Purchased Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	1,200		1,200
Charge-offs	(470)	(702)	(535)	(2,115)
Recoveries	36	294	84	392
Provision	434	$ 408	451	$ 1,723
Ending balance	$ 1,200		$ 1,200

Allowance for Loan and Lease 44

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Summary of Allowance for Loan and Lease Losses and Recorded Investment in Non-Purchased Loans and Leases (Detail) - USD ($) $ in Thousands		Jun. 30, 2016		Mar. 31, 2016	Dec. 31, 2015		Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for Individually Evaluated Impaired Loans and Leases		$ 1,315			$ 1,340
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		65,133		$ 61,760	60,854		$ 56,749	$ 54,147	$ 52,918
Non-Purchased Loans and Leases - Total ALLL		63,933	[1]		59,654	[1]	56,749
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases		5,493			10,667
Non-Purchased Loans and Leases - All Other Loans and Leases		8,209,407			6,517,967
Total non-purchased loans and leases		8,214,900			6,528,634
ALLL for All Other Loans and Leases [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		62,618			58,314
Real Estate [Member] | Residential 1-4 Family [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for Individually Evaluated Impaired Loans and Leases		267			297
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		10,099		9,429	8,672		5,601	5,657	5,482
Non-Purchased Loans and Leases - Total ALLL	[1]	10,099			8,672
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases		2,092			2,030
Non-Purchased Loans and Leases - All Other Loans and Leases		406,142			348,224
Total non-purchased loans and leases		408,234			350,254
Real Estate [Member] | Non-Farm/Non-Residential [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for Individually Evaluated Impaired Loans and Leases		21			31
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		19,118		18,761	16,796		18,232	17,766	17,190
Non-Purchased Loans and Leases - Total ALLL	[1]	19,118			16,796
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases		1,033			940
Non-Purchased Loans and Leases - All Other Loans and Leases		2,619,419			2,009,926
Total non-purchased loans and leases		2,620,452			2,010,866
Real Estate [Member] | Construction/Land Development [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for Individually Evaluated Impaired Loans and Leases		46			48
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		17,496		15,259	18,176		19,148	17,580	15,960
Non-Purchased Loans and Leases - Total ALLL	[1]	17,496			18,176
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases		280			5,556
Non-Purchased Loans and Leases - All Other Loans and Leases		3,600,475			2,820,019
Total non-purchased loans and leases		3,600,755			2,825,575
Real Estate [Member] | Agricultural [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for Individually Evaluated Impaired Loans and Leases		468			475
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		3,755		3,684	3,388		2,460	2,526	2,558
Non-Purchased Loans and Leases - Total ALLL	[1]	3,755			3,388
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases		1,328			1,313
Non-Purchased Loans and Leases - All Other Loans and Leases		88,979			73,127
Total non-purchased loans and leases		90,307			74,440
Real Estate [Member] | Multifamily Residential [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		3,661		3,914	3,031		2,886	2,423	2,147
Non-Purchased Loans and Leases - Total ALLL	[1]	3,661			3,031
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases					83
Non-Purchased Loans and Leases - All Other Loans and Leases		591,792			440,745
Total non-purchased loans and leases		591,792			440,828
Real Estate [Member] | ALLL for All Other Loans and Leases [Member] | Residential 1-4 Family [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		9,832			8,375
Real Estate [Member] | ALLL for All Other Loans and Leases [Member] | Non-Farm/Non-Residential [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		19,097			16,765
Real Estate [Member] | ALLL for All Other Loans and Leases [Member] | Construction/Land Development [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		17,450			18,128
Real Estate [Member] | ALLL for All Other Loans and Leases [Member] | Agricultural [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		3,287			2,913
Real Estate [Member] | ALLL for All Other Loans and Leases [Member] | Multifamily Residential [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		3,661			3,031
Commercial and Industrial [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for Individually Evaluated Impaired Loans and Leases		508			487
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		3,790		3,399	2,574		3,249	3,301	4,873
Non-Purchased Loans and Leases - Total ALLL	[1]	3,790			2,574
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases		709			714
Non-Purchased Loans and Leases - All Other Loans and Leases		254,003			230,567
Total non-purchased loans and leases		254,712			231,281
Commercial and Industrial [Member] | ALLL for All Other Loans and Leases [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		3,282			2,087
Consumer [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for Individually Evaluated Impaired Loans and Leases		5			2
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		712		707	707		825	824	818
Non-Purchased Loans and Leases - Total ALLL	[1]	712			707
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases		45			24
Non-Purchased Loans and Leases - All Other Loans and Leases		28,492			27,721
Total non-purchased loans and leases		28,537			27,745
Consumer [Member] | ALLL for All Other Loans and Leases [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		707			705
Direct Financing Leases [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		4,092		4,235	3,835		3,554	3,258	2,989
Non-Purchased Loans and Leases - Total ALLL	[1]	4,092			3,835
Non-Purchased Loans and Leases - All Other Loans and Leases		133,775			147,735
Total non-purchased loans and leases		133,775			147,735
Direct Financing Leases [Member] | ALLL for All Other Loans and Leases [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		4,092			3,835
Other [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		1,210		$ 1,172	2,475		$ 794	$ 812	$ 901
Non-Purchased Loans and Leases - Total ALLL	[1]	1,210			2,475
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases		6			7
Non-Purchased Loans and Leases - All Other Loans and Leases		486,330			419,903
Total non-purchased loans and leases		486,336			419,910
Other [Member] | ALLL for All Other Loans and Leases [Member]
Allowance For Loan And Lease Losses [Line Items]
Non-Purchased Loans and Leases - ALLL for All Other Loans and Leases		$ 1,210			$ 2,475
[1]	Excludes $1.2 million of ALLL allocated to the Company’s purchased loans at both June 30, 2016 and December 31, 2015

Allowance for Loan and Lease 45

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Summary of Allowance for Loan and Lease Losses and Recorded Investment in Non-Purchased Loans and Leases (Parenthetical) (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Receivables [Abstract]
Allowance for purchased loan portfolio	$ 1.2	$ 1.2

Allowance for Loan and Lease 46

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Schedule of Impaired Non-purchased Loans and Leases, FDIC Loss Share Agreements (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Principal Balance, with Related Allowance	$ 5,994	$ 5,994	$ 6,001
Net Charge-offs to Date, with Related Allowance	(3,013)	(3,013)	(3,048)
Principal Balance, with Related Allowance, Net of Charge-offs	2,981	2,981	2,953
Specific Allowance	1,315	1,315	1,340
Weighted Average Carrying Value, with Related Allowance	3,171	3,098	3,203
Principal Balance, with no Related Allowance	4,349	4,349	11,126
Net Charge-offs to Date, with no Related Allowance	(1,837)	(1,837)	(3,412)
Principal Balance, with no Related Allowance, Net of Charge-offs	2,512	2,512	7,714
Weighted Average Carrying Value, with no Related Allowance	4,210	5,378	10,925
Principal Balance	10,343	10,343	17,127
Net Charge-offs to Date	(4,850)	(4,850)	(6,460)
Principal Balance, Net of Charge-offs	5,493	5,493	10,667
Weighted Average Carrying Value	7,381	8,476	14,128
Real Estate [Member] | Residential 1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Principal Balance, with Related Allowance	2,766	2,766	2,914
Net Charge-offs to Date, with Related Allowance	(1,763)	(1,763)	(1,804)
Principal Balance, with Related Allowance, Net of Charge-offs	1,003	1,003	1,110
Specific Allowance	267	267	297
Weighted Average Carrying Value, with Related Allowance	1,256	1,207	1,279
Principal Balance, with no Related Allowance	1,568	1,568	1,306
Net Charge-offs to Date, with no Related Allowance	(479)	(479)	(386)
Principal Balance, with no Related Allowance, Net of Charge-offs	1,089	1,089	920
Weighted Average Carrying Value, with no Related Allowance	981	961	955
Real Estate [Member] | Non-Farm/Non-Residential [Member]
Financing Receivable, Impaired [Line Items]
Principal Balance, with Related Allowance	1,087	1,087	962
Net Charge-offs to Date, with Related Allowance	(914)	(914)	(907)
Principal Balance, with Related Allowance, Net of Charge-offs	173	173	55
Specific Allowance	21	21	31
Weighted Average Carrying Value, with Related Allowance	113	93	129
Principal Balance, with no Related Allowance	1,058	1,058	1,083
Net Charge-offs to Date, with no Related Allowance	(198)	(198)	(198)
Principal Balance, with no Related Allowance, Net of Charge-offs	860	860	885
Weighted Average Carrying Value, with no Related Allowance	861	869	1,137
Real Estate [Member] | Construction/Land Development [Member]
Financing Receivable, Impaired [Line Items]
Principal Balance, with Related Allowance	118	118	121
Principal Balance, with Related Allowance, Net of Charge-offs	118	118	121
Specific Allowance	46	46	48
Weighted Average Carrying Value, with Related Allowance	119	120	896
Principal Balance, with no Related Allowance	925	925	7,873
Net Charge-offs to Date, with no Related Allowance	(763)	(763)	(2,438)
Principal Balance, with no Related Allowance, Net of Charge-offs	162	162	5,435
Weighted Average Carrying Value, with no Related Allowance	1,926	3,096	8,255
Real Estate [Member] | Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Principal Balance, with Related Allowance	1,145	1,145	1,153
Principal Balance, with Related Allowance, Net of Charge-offs	1,145	1,145	1,153
Specific Allowance	468	468	475
Weighted Average Carrying Value, with Related Allowance	1,147	1,149	479
Principal Balance, with no Related Allowance	392	392	362
Net Charge-offs to Date, with no Related Allowance	(209)	(209)	(202)
Principal Balance, with no Related Allowance, Net of Charge-offs	183	183	160
Weighted Average Carrying Value, with no Related Allowance	183	175	261
Real Estate [Member] | Multifamily Residential [Member]
Financing Receivable, Impaired [Line Items]
Principal Balance, with no Related Allowance	133	133	216
Net Charge-offs to Date, with no Related Allowance	(133)	(133)	(133)
Principal Balance, with no Related Allowance, Net of Charge-offs			83
Weighted Average Carrying Value, with no Related Allowance	41	55	155
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Principal Balance, with Related Allowance	829	829	825
Net Charge-offs to Date, with Related Allowance	(321)	(321)	(322)
Principal Balance, with Related Allowance, Net of Charge-offs	508	508	503
Specific Allowance	508	508	487
Weighted Average Carrying Value, with Related Allowance	514	511	404
Principal Balance, with no Related Allowance	251	251	261
Net Charge-offs to Date, with no Related Allowance	(50)	(50)	(50)
Principal Balance, with no Related Allowance, Net of Charge-offs	201	201	211
Weighted Average Carrying Value, with no Related Allowance	201	204	141
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Principal Balance, with Related Allowance	49	49	26
Net Charge-offs to Date, with Related Allowance	(15)	(15)	(15)
Principal Balance, with Related Allowance, Net of Charge-offs	34	34	11
Specific Allowance	5	5	2
Weighted Average Carrying Value, with Related Allowance	22	18	16
Principal Balance, with no Related Allowance	16	16	18
Net Charge-offs to Date, with no Related Allowance	(5)	(5)	(5)
Principal Balance, with no Related Allowance, Net of Charge-offs	11	11	13
Weighted Average Carrying Value, with no Related Allowance	11	11	14
Other [Member]
Financing Receivable, Impaired [Line Items]
Principal Balance, with no Related Allowance	6	6	7
Principal Balance, with no Related Allowance, Net of Charge-offs	6	6	7
Weighted Average Carrying Value, with no Related Allowance	$ 6	$ 7	$ 7

Allowance for Loan and Lease 47

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Summary of Credit Quality Indicators for Loans and Leases, Non-Purchased Loans and Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Loans And Leases [Line Items]
Total non-purchased loans and leases	$ 8,214,900	$ 6,528,634
Satisfactory [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	7,371,585	5,799,105
Moderate [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	717,739	602,563
Watch [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	108,604	101,140
Substandard [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	16,972	25,826
Real Estate [Member] | Residential 1-4 Family [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	408,234	350,254
Real Estate [Member] | Non-Farm/Non-Residential [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	2,620,452	2,010,866
Real Estate [Member] | Construction/Land Development [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	3,600,755	2,825,575
Real Estate [Member] | Agricultural [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	90,307	74,440
Real Estate [Member] | Multifamily Residential [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	591,792	440,828
Real Estate [Member] | Satisfactory [Member] | Residential 1-4 Family [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	399,027	342,083
Real Estate [Member] | Satisfactory [Member] | Non-Farm/Non-Residential [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	2,270,225	1,692,632
Real Estate [Member] | Satisfactory [Member] | Construction/Land Development [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	3,302,321	2,553,368
Real Estate [Member] | Satisfactory [Member] | Agricultural [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	51,010	40,538
Real Estate [Member] | Satisfactory [Member] | Multifamily Residential [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	542,211	400,848
Real Estate [Member] | Moderate [Member] | Non-Farm/Non-Residential [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	265,385	235,999
Real Estate [Member] | Moderate [Member] | Construction/Land Development [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	286,631	256,655
Real Estate [Member] | Moderate [Member] | Agricultural [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	28,270	22,799
Real Estate [Member] | Moderate [Member] | Multifamily Residential [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	46,668	35,080
Real Estate [Member] | Watch [Member] | Residential 1-4 Family [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	4,095	2,946
Real Estate [Member] | Watch [Member] | Non-Farm/Non-Residential [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	79,323	73,788
Real Estate [Member] | Watch [Member] | Construction/Land Development [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	10,362	8,916
Real Estate [Member] | Watch [Member] | Agricultural [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	9,362	8,909
Real Estate [Member] | Watch [Member] | Multifamily Residential [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	1,857	4,079
Real Estate [Member] | Substandard [Member] | Residential 1-4 Family [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	5,112	5,225
Real Estate [Member] | Substandard [Member] | Non-Farm/Non-Residential [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	5,519	8,447
Real Estate [Member] | Substandard [Member] | Construction/Land Development [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	1,441	6,636
Real Estate [Member] | Substandard [Member] | Agricultural [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	1,665	2,194
Real Estate [Member] | Substandard [Member] | Multifamily Residential [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	1,056	821
Commercial and Industrial [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	254,712	231,281
Commercial and Industrial [Member] | Satisfactory [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	165,438	179,797
Commercial and Industrial [Member] | Moderate [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	84,965	47,802
Commercial and Industrial [Member] | Watch [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	3,017	1,854
Commercial and Industrial [Member] | Substandard [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	1,292	1,828
Consumer [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	28,537	27,745
Consumer [Member] | Satisfactory [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	28,101	27,219
Consumer [Member] | Watch [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	221	276
Consumer [Member] | Substandard [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	215	250
Direct Financing Leases [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	133,775	147,735
Direct Financing Leases [Member] | Satisfactory [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	132,887	146,934
Direct Financing Leases [Member] | Moderate [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	170	201
Direct Financing Leases [Member] | Watch [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	160	190
Direct Financing Leases [Member] | Substandard [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	558	410
Other [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	486,336	419,910
Other [Member] | Satisfactory [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	480,365	415,686
Other [Member] | Moderate [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	5,650	4,027
Other [Member] | Watch [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	207	182
Other [Member] | Substandard [Member]
Loans And Leases [Line Items]
Total non-purchased loans and leases	$ 114	$ 15

Allowance for Loan and Lease 48

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Schedule of Aging Analysis Past Due Loans and Leases, Non-Purchased by FDIC Loss Share Agreements (Detail) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-purchased loans and leases		$ 8,214,900	$ 6,528,634
Real Estate [Member] | Residential 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-purchased loans and leases		408,234	350,254
Real Estate [Member] | Non-Farm/Non-Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-purchased loans and leases		2,620,452	2,010,866
Real Estate [Member] | Construction/Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-purchased loans and leases		3,600,755	2,825,575
Real Estate [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-purchased loans and leases		90,307	74,440
Real Estate [Member] | Multifamily Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-purchased loans and leases		591,792	440,828
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-purchased loans and leases		254,712	231,281
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-purchased loans and leases		28,537	27,745
Direct Financing Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-purchased loans and leases		133,775	147,735
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-purchased loans and leases		486,336	419,910
Non-Purchased Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		18,020	18,460
Current	[1]	8,196,880	6,510,174
Total non-purchased loans and leases		8,214,900	6,528,634
Non-Purchased Loans [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	13,521	9,093
Non-Purchased Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[3]	4,499	9,367
Non-Purchased Loans [Member] | Real Estate [Member] | Residential 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		6,262	4,300
Current	[1]	401,972	345,954
Total non-purchased loans and leases		408,234	350,254
Non-Purchased Loans [Member] | Real Estate [Member] | Residential 1-4 Family [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	4,677	2,793
Non-Purchased Loans [Member] | Real Estate [Member] | Residential 1-4 Family [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[3]	1,585	1,507
Non-Purchased Loans [Member] | Real Estate [Member] | Non-Farm/Non-Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,403	2,658
Current	[1]	2,617,049	2,008,208
Total non-purchased loans and leases		2,620,452	2,010,866
Non-Purchased Loans [Member] | Real Estate [Member] | Non-Farm/Non-Residential [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	2,258	1,881
Non-Purchased Loans [Member] | Real Estate [Member] | Non-Farm/Non-Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[3]	1,145	777
Non-Purchased Loans [Member] | Real Estate [Member] | Construction/Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,755	6,688
Current	[1]	3,597,000	2,818,887
Total non-purchased loans and leases		3,600,755	2,825,575
Non-Purchased Loans [Member] | Real Estate [Member] | Construction/Land Development [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	3,531	1,043
Non-Purchased Loans [Member] | Real Estate [Member] | Construction/Land Development [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[3]	224	5,645
Non-Purchased Loans [Member] | Real Estate [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,555	2,023
Current	[1]	88,752	72,417
Total non-purchased loans and leases		90,307	74,440
Non-Purchased Loans [Member] | Real Estate [Member] | Agricultural [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	1,372	1,780
Non-Purchased Loans [Member] | Real Estate [Member] | Agricultural [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[3]	183	243
Non-Purchased Loans [Member] | Real Estate [Member] | Multifamily Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		736	83
Current	[1]	591,056	440,745
Total non-purchased loans and leases		591,792	440,828
Non-Purchased Loans [Member] | Real Estate [Member] | Multifamily Residential [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	736
Non-Purchased Loans [Member] | Real Estate [Member] | Multifamily Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[3]		83
Non-Purchased Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,049	1,574
Current	[1]	253,663	229,707
Total non-purchased loans and leases		254,712	231,281
Non-Purchased Loans [Member] | Commercial and Industrial [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	309	823
Non-Purchased Loans [Member] | Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[3]	740	751
Non-Purchased Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		241	281
Current	[1]	28,296	27,464
Total non-purchased loans and leases		28,537	27,745
Non-Purchased Loans [Member] | Consumer [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	219	248
Non-Purchased Loans [Member] | Consumer [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[3]	22	33
Non-Purchased Loans [Member] | Direct Financing Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		911	838
Current	[1]	132,864	146,897
Total non-purchased loans and leases		133,775	147,735
Non-Purchased Loans [Member] | Direct Financing Leases [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	419	517
Non-Purchased Loans [Member] | Direct Financing Leases [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[3]	492	321
Non-Purchased Loans [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		108	15
Current	[1]	486,228	419,895
Total non-purchased loans and leases		486,336	419,910
Non-Purchased Loans [Member] | Other [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]		8
Non-Purchased Loans [Member] | Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[3]	$ 108	$ 7
[1]	Includes $1.9 million and $2.3 million of loans and leases on nonaccrual status at June 30, 2016 and December 31, 2015, respectively.
[2]	Includes $1.4 million and $1.9 million at June 30, 2016 and December 31, 2015, respectively, of loans and leases on nonaccrual status.
[3]	All loans and leases greater than 90 days past due were on nonaccrual status at June 30, 2016 and December 31, 2015.

Allowance for Loan and Lease 49

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Schedule of Aging Analysis Past Due Loans and Leases, Non-Purchased by FDIC Loss Share Agreements (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Non Accrual Loans Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases on nonaccrual status	$ 1.9	$ 2.3
Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases on nonaccrual status	$ 1.4	$ 1.9

Allowance for Loan and Lease 50

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Receivables [Abstract]
Impaired purchased loans	$ 6,387	$ 8,054

Allowance for Loan and Lease 51

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Summary of Credit Quality Indicators for Loans Purchased (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Loans And Leases [Line Items]
Total purchased Loans	$ 1,515,104	$ 1,806,037
Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 33 [Member]
Loans And Leases [Line Items]
Total purchased Loans	277,398	320,914
Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 44 [Member]
Loans And Leases [Line Items]
Total purchased Loans	788,334	950,789
Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 55 [Member]
Loans And Leases [Line Items]
Total purchased Loans	183,909	207,592
Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 36 [Member]
Loans And Leases [Line Items]
Total purchased Loans	89,751	109,185
Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 77 [Member]
Loans And Leases [Line Items]
Total purchased Loans	562	771
Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | FV 66 [Member]
Loans And Leases [Line Items]
Total purchased Loans	169,325	209,503
Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | FV 88 [Member]
Loans And Leases [Line Items]
Total purchased Loans	5,825	7,283
Real Estate [Member] | Residential 1-4 Family [Member]
Loans And Leases [Line Items]
Total purchased Loans	319,354	386,952
Real Estate [Member] | Non-Farm/Non-Residential [Member]
Loans And Leases [Line Items]
Total purchased Loans	997,972	1,135,547
Real Estate [Member] | Construction/Land Development [Member]
Loans And Leases [Line Items]
Total purchased Loans	37,274	47,823
Real Estate [Member] | Agricultural [Member]
Loans And Leases [Line Items]
Total purchased Loans	13,235	19,918
Real Estate [Member] | Multifamily Residential [Member]
Loans And Leases [Line Items]
Total purchased Loans	104,446	139,497
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Residential 1-4 Family [Member] | FV 33 [Member]
Loans And Leases [Line Items]
Total purchased Loans	53,349	59,497
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Residential 1-4 Family [Member] | FV 44 [Member]
Loans And Leases [Line Items]
Total purchased Loans	88,447	117,498
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Residential 1-4 Family [Member] | FV 55 [Member]
Loans And Leases [Line Items]
Total purchased Loans	33,412	38,888
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Residential 1-4 Family [Member] | FV 36 [Member]
Loans And Leases [Line Items]
Total purchased Loans	73,753	85,684
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Residential 1-4 Family [Member] | FV 77 [Member]
Loans And Leases [Line Items]
Total purchased Loans	72	351
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Non-Farm/Non-Residential [Member] | FV 33 [Member]
Loans And Leases [Line Items]
Total purchased Loans	181,990	209,542
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Non-Farm/Non-Residential [Member] | FV 44 [Member]
Loans And Leases [Line Items]
Total purchased Loans	615,083	693,707
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Non-Farm/Non-Residential [Member] | FV 55 [Member]
Loans And Leases [Line Items]
Total purchased Loans	111,291	122,652
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Non-Farm/Non-Residential [Member] | FV 36 [Member]
Loans And Leases [Line Items]
Total purchased Loans	3,926	5,039
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Non-Farm/Non-Residential [Member] | FV 77 [Member]
Loans And Leases [Line Items]
Total purchased Loans	422	363
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Construction/Land Development [Member] | FV 33 [Member]
Loans And Leases [Line Items]
Total purchased Loans	11,660	13,121
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Construction/Land Development [Member] | FV 44 [Member]
Loans And Leases [Line Items]
Total purchased Loans	9,356	12,511
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Construction/Land Development [Member] | FV 55 [Member]
Loans And Leases [Line Items]
Total purchased Loans	5,960	7,137
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Construction/Land Development [Member] | FV 36 [Member]
Loans And Leases [Line Items]
Total purchased Loans	3,366	4,771
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Construction/Land Development [Member] | FV 77 [Member]
Loans And Leases [Line Items]
Total purchased Loans	22	22
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Agricultural [Member] | FV 33 [Member]
Loans And Leases [Line Items]
Total purchased Loans	3,353	4,825
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Agricultural [Member] | FV 44 [Member]
Loans And Leases [Line Items]
Total purchased Loans	4,889	7,963
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Agricultural [Member] | FV 55 [Member]
Loans And Leases [Line Items]
Total purchased Loans	999	1,456
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Agricultural [Member] | FV 36 [Member]
Loans And Leases [Line Items]
Total purchased Loans	472	797
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Multifamily Residential [Member] | FV 33 [Member]
Loans And Leases [Line Items]
Total purchased Loans	16,641	20,347
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Multifamily Residential [Member] | FV 44 [Member]
Loans And Leases [Line Items]
Total purchased Loans	59,309	86,588
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Multifamily Residential [Member] | FV 55 [Member]
Loans And Leases [Line Items]
Total purchased Loans	24,998	27,818
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Multifamily Residential [Member] | FV 36 [Member]
Loans And Leases [Line Items]
Total purchased Loans	824	896
Real Estate [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Multifamily Residential [Member] | FV 77 [Member]
Loans And Leases [Line Items]
Total purchased Loans	13	13
Real Estate [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | Residential 1-4 Family [Member] | FV 66 [Member]
Loans And Leases [Line Items]
Total purchased Loans	68,805	82,862
Real Estate [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | Residential 1-4 Family [Member] | FV 88 [Member]
Loans And Leases [Line Items]
Total purchased Loans	1,516	2,172
Real Estate [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | Non-Farm/Non-Residential [Member] | FV 66 [Member]
Loans And Leases [Line Items]
Total purchased Loans	81,111	99,681
Real Estate [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | Non-Farm/Non-Residential [Member] | FV 88 [Member]
Loans And Leases [Line Items]
Total purchased Loans	4,149	4,563
Real Estate [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | Construction/Land Development [Member] | FV 66 [Member]
Loans And Leases [Line Items]
Total purchased Loans	6,822	10,224
Real Estate [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | Construction/Land Development [Member] | FV 88 [Member]
Loans And Leases [Line Items]
Total purchased Loans	88	37
Real Estate [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | Agricultural [Member] | FV 66 [Member]
Loans And Leases [Line Items]
Total purchased Loans	3,522	4,877
Real Estate [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | Multifamily Residential [Member] | FV 66 [Member]
Loans And Leases [Line Items]
Total purchased Loans	2,661	3,835
Commercial and Industrial [Member]
Loans And Leases [Line Items]
Total purchased Loans	33,517	60,522
Commercial and Industrial [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 33 [Member]
Loans And Leases [Line Items]
Total purchased Loans	6,803	8,912
Commercial and Industrial [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 44 [Member]
Loans And Leases [Line Items]
Total purchased Loans	10,287	29,001
Commercial and Industrial [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 55 [Member]
Loans And Leases [Line Items]
Total purchased Loans	7,077	9,244
Commercial and Industrial [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 36 [Member]
Loans And Leases [Line Items]
Total purchased Loans	3,560	5,649
Commercial and Industrial [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 77 [Member]
Loans And Leases [Line Items]
Total purchased Loans	25	20
Commercial and Industrial [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | FV 66 [Member]
Loans And Leases [Line Items]
Total purchased Loans	5,693	7,185
Commercial and Industrial [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | FV 88 [Member]
Loans And Leases [Line Items]
Total purchased Loans	72	511
Consumer [Member]
Loans And Leases [Line Items]
Total purchased Loans	4,662	7,487
Consumer [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 33 [Member]
Loans And Leases [Line Items]
Total purchased Loans	551	726
Consumer [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 44 [Member]
Loans And Leases [Line Items]
Total purchased Loans	125	205
Consumer [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 55 [Member]
Loans And Leases [Line Items]
Total purchased Loans	29	185
Consumer [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 36 [Member]
Loans And Leases [Line Items]
Total purchased Loans	3,757	6,106
Consumer [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 77 [Member]
Loans And Leases [Line Items]
Total purchased Loans		2
Consumer [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | FV 66 [Member]
Loans And Leases [Line Items]
Total purchased Loans	200	263
Other [Member]
Loans And Leases [Line Items]
Total purchased Loans	4,644	8,291
Other [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 33 [Member]
Loans And Leases [Line Items]
Total purchased Loans	3,051	3,944
Other [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 44 [Member]
Loans And Leases [Line Items]
Total purchased Loans	838	3,316
Other [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 55 [Member]
Loans And Leases [Line Items]
Total purchased Loans	143	212
Other [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 36 [Member]
Loans And Leases [Line Items]
Total purchased Loans	93	243
Other [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | FV 77 [Member]
Loans And Leases [Line Items]
Total purchased Loans	8
Other [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | FV 66 [Member]
Loans And Leases [Line Items]
Total purchased Loans	$ 511	$ 576

Allowance for Loan and Lease 52

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Schedule of Aging Analysis of Past Due Loans Purchased by FDIC Loss Share Agreements (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total purchased loans	$ 1,515,104	$ 1,806,037
Real Estate [Member] | Residential 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total purchased loans	319,354	386,952
Real Estate [Member] | Non-Farm/Non-Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total purchased loans	997,972	1,135,547
Real Estate [Member] | Construction/Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total purchased loans	37,274	47,823
Real Estate [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total purchased loans	13,235	19,918
Real Estate [Member] | Multifamily Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total purchased loans	104,446	139,497
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total purchased loans	33,517	60,522
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total purchased loans	4,662	7,487
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total purchased loans	4,644	8,291
Purchased Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	22,645	30,343
Current	1,492,459	1,775,694
Total purchased loans	1,515,104	1,806,037
Purchased Loans [Member] | Real Estate [Member] | Residential 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,586	15,335
Current	307,768	371,617
Total purchased loans	319,354	386,952
Purchased Loans [Member] | Real Estate [Member] | Non-Farm/Non-Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,509	10,272
Current	990,463	1,125,275
Total purchased loans	997,972	1,135,547
Purchased Loans [Member] | Real Estate [Member] | Construction/Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,228	2,174
Current	36,046	45,649
Total purchased loans	37,274	47,823
Purchased Loans [Member] | Real Estate [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	483	462
Current	12,752	19,456
Total purchased loans	13,235	19,918
Purchased Loans [Member] | Real Estate [Member] | Multifamily Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13	299
Current	104,433	139,198
Total purchased loans	104,446	139,497
Purchased Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,745	1,638
Current	31,772	58,884
Total purchased loans	33,517	60,522
Purchased Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	81	142
Current	4,581	7,345
Total purchased loans	4,662	7,487
Purchased Loans [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		21
Current	4,644	8,270
Total purchased loans	4,644	8,291
Purchased Loans [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,325	14,626
Purchased Loans [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Real Estate [Member] | Residential 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,492	9,042
Purchased Loans [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Real Estate [Member] | Non-Farm/Non-Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,578	3,435
Purchased Loans [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Real Estate [Member] | Construction/Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	412	919
Purchased Loans [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Real Estate [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	130	106
Purchased Loans [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Real Estate [Member] | Multifamily Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		299
Purchased Loans [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	661	714
Purchased Loans [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	52	101
Purchased Loans [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		10
Purchased Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13,320	15,717
Purchased Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate [Member] | Residential 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,094	6,293
Purchased Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate [Member] | Non-Farm/Non-Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,931	6,837
Purchased Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate [Member] | Construction/Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	816	1,255
Purchased Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	353	356
Purchased Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate [Member] | Multifamily Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13
Purchased Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,084	924
Purchased Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	29	41
Purchased Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		11
Purchased Loans [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,439	10,715
Current	1,332,515	1,578,536
Total purchased loans	1,339,954	1,589,251
Purchased Loans [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,246	7,972
Purchased Loans [Member] | Purchased Loans Without Evidence of Credit Deterioration at Date of Acquisition [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,193	2,743
Purchased Loans [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,206	19,628
Current	159,944	197,158
Total purchased loans	175,150	216,786
Purchased Loans [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | Financing Receivables, 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,079	6,654
Purchased Loans [Member] | Purchased Loans with Evidence of Credit Deterioration of Acquisition [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 10,127	$ 12,974

Subordinated Notes - Additional

Subordinated Notes - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 23, 2016	Jun. 30, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Subordinated debentures	$ 225,000	$ 117,962	$ 117,685
Fixed to floating rate	5.50%
Proceeds from sale of securities	$ 222,300
Maturity date	Jul. 1, 2026
Initial interest rate	5.50%
Interest rate, adjustable quarterly		The Notes will bear interest at a floating rate equal to three-month London Interbank Offered Rate (“LIBOR”) as calculated on each applicable date of determination plus a spread of 442.5 basis points; provided, however, that in the event three-month LIBOR is less than zero, then three-month LIBOR shall be deemed to be zero.
Basis spread points	4.425%
Debt issuance costs	$ 2,700
Debt issue costs, amortization period	7 years
Redemption price percentage	100.00%
Interest payment date	Jul. 1, 2021

Supplemental Data for Cash Fl54

Supplemental Data for Cash Flows - Schedule of Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Interest	$ 20,073	$ 13,031
Taxes	71,904	34,024
Net change in unrealized gains/losses on investment securities AFS	10,382	(10,218)
Loans transferred to foreclosed assets	10,236	9,797
Loans advanced for sales of foreclosed assets	127
Unsettled AFS investment security purchases	27,388	4,453
Unsettled loan sales		14,361
Unsettled loan purchases	$ 14,428	18,269
Common stock issued in merger and acquisition transaction		$ 238,476

Guarantees and Commitments - Ad

Guarantees and Commitments - Additional Information (Detail) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Guarantees And Commitments [Line Items]
Outstanding commitments to extend credit, consisting of loans closed, not yet funded	$ 7,350,000,000
Additional outstanding commitments to extend credit, under mortgage interest rate lock commitments	28,200,000	$ 15,700,000
Standby Letters of Credit [Member]
Guarantees And Commitments [Line Items]
Maximum amount of future payments required to make under guarantees	17,300,000
Collateralized commitments	$ 16,200,000

Guarantees and Commitments - Co

Guarantees and Commitments - Contractual Maturities (Detail) $ in Thousands	Jun. 30, 2016USD ($)
Contractual Obligation Fiscal Year Maturity [Abstract]
2,016	$ 200,997
2,017	1,010,841
2,018	2,603,175
2,019	2,123,899
2,020	1,286,274
Thereafter	124,541
Total	$ 7,349,727

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available to non-employee directors through the non qualified stock option plan for non-employee directors, other than annual meeting			6,683
Share-based compensation arrangement by share-based payment award options exercisable intrinsic value per share			$ 0
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense for stock options included in non-interest expense	$ 1,000,000	$ 600,000	$ 2,000,000	$ 1,200,000
Total intrinsic value of options exercised during the period	700,000	1,400,000	1,500,000	2,800,000
Total unrecognized compensation expenses	8,800,000		$ 8,800,000
Unrecognized compensation cost, weighted-average period, years			2 years 1 month 6 days
Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense for stock options included in non-interest expense	1,700,000	1,400,000	$ 2,700,000	$ 2,700,000
Total unrecognized compensation expenses	12,600,000		$ 12,600,000
Unrecognized compensation cost, weighted-average period, years			2 years 1 month 6 days
Maximum [Member] | Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award issued with a vesting period, years			3 years
Nonqualified Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award issued with a vesting period, years			3 years
Employee options expire after issuance, years			7 years
Expiration period of options issued to non-employee director			10 years
Nonqualified Stock Option Plan [Member] | Non Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available to non-employee directors through the non qualified stock option plan for non-employee directors, other than annual meeting			0	0
Non-Employee Directors Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of non-employee directors stock awards on the date of grant			$ 35,000
Number of common stock shares issued			12,415	7,657
Stock-based compensation expense for stock options included in non-interest expense	$ 500,000	$ 300,000	$ 500,000	$ 300,000
Non-Employee Directors Stock Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares issued as awards	50,000		50,000

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding – December 31, 2015, Options		2,034,476
Granted, Options		6,683
Exercised, Options		(53,770)	(99,050)
Forfeited, Options		(63,125)
Outstanding – June 30, 2016, Options		1,924,264
Fully vested and exercisable – June 30, 2016, Options		402,855
Expected to vest in future periods, Options		1,428,628
Fully vested and expected to vest – June 30, 2016, Options	[1]	1,831,483
Outstanding - January 1, 2016, Weighted-Average Exercise Price/Share		$ 34.50
Granted, Weighted-Average Exercise Price/Share		45.89
Exercised, Weighted-Average Exercise Price/Share		16.76
Forfeited, Weighted-Average Exercise Price/Share		39.35
Outstanding - June 30, 2016, Weighted-Average Exercise Price/Share		34.94
Fully vested and exercisable - June 30, 2016, Weighted-Average Exercise Price/Share		15.03
Fully vested and expected to vest - June 30, 2016, Weighted-Average Exercise Price/Share	[1]	$ 34.38
Outstanding - June 30, 2016, Weighted-Average Remaining Contractual Life (in years)		5 years 2 months 12 days
Fully vested and exercisable - June 30, 2016, Weighted-Average Remaining Contractual Life (in years)		3 years 8 months 12 days
Fully vested and expected to vest - June 30, 2016, Weighted-Average Remaining Contractual Life (in years)		5 years 1 month 6 days
Outstanding – June 30, 2016, Aggregate Intrinsic value	[2]	$ 14,822
Fully vested and exercisable – June 30, 2016, Aggregate Intrinsic value	[2]	9,061
Fully vested and expected to vest – June 30, 2016, Aggregate Intrinsic value	[2]	$ 14,707
[1]	At June 30, 2016, the Company estimated that outstanding options to purchase 92,781 shares of its common stock would not vest and would be forfeited prior to their vesting date.
[2]	Based on closing price of $37.52 per share on June 30, 2016.

Stock-Based Compensation - Su59

Stock-Based Compensation - Summary of Stock Option Activity (Parenthetical) (Detail)	Jun. 30, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated number of common shares that could be forfeited before the vesting date | shares	92,781
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, closing price, per share | $ / shares	$ 37.52

Stock-Based Compensation - Su60

Stock-Based Compensation - Summary of Non-Vested Restricted Stock Activity (Detail) - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Disclosure Of Compensation Related Costs Sharebased Payments Restricted Stock [Abstract]
Outstanding – December 31, 2015	435,475
Granted	213,907
Forfeited	(13,986)	(29,875)
Outstanding – June 30, 2016	635,396
Weighted-average grant date fair value	$ 35.08

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	$ 0	$ 0
Fair value of private placement bonds	17,900,000
Third party pricing for private placement bonds	17,900,000
Lower of the matrix price or par value of private placement bonds	17,900,000
Impaired financing receivable recorded investment reduction to estimated fair value	6,200,000
Estimated fair value of impaired loans and leases	4,200,000
Partial charge-offs to reduce carrying value of impaired loans and leases to estimated fair value	4,900,000
Specific loan and lease allocations to reduce carrying value of impaired loans and leases to estimated fair value	1,300,000
Impaired purchased loans	$ 6,400,000
Estimated cost percentage of repossessed personal properties and real estate, minimum	8.00%
Estimated cost percentage of repossessed personal properties and real estate, maximum	10.00%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate used to determine net present value of purchased foreclosed assets	8.00%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate used to determine net present value of purchased foreclosed assets	9.50%

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities AFS	$ 824,399	$ 602,348
Total investment securities AFS	818,261	578,818
Impaired non-purchased loans and leases	4,178	9,327
Impaired purchased loans	6,387	8,054
Foreclosed assets	23,328	22,870
Total assets at fair value	852,154	619,069
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investment securities AFS	1,061	1,028
Total assets at fair value	1,061	1,028
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investment securities AFS	799,309	559,286
Total assets at fair value	799,309	559,286
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investment securities AFS	17,891	18,504
Impaired non-purchased loans and leases	4,178	9,327
Impaired purchased loans	6,387	8,054
Foreclosed assets	23,328	22,870
Total assets at fair value	51,784	58,755
Obligations of State and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities AFS	603,090	427,278
Obligations of State and Political Subdivisions [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities AFS	585,199	408,774
Obligations of State and Political Subdivisions [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities AFS	17,891	18,504
U.S. Government Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities AFS	210,556	146,950
U.S. Government Agency Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities AFS	210,556	146,950
Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities AFS	3,554	3,562
Corporate Obligations [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities AFS	3,554	3,562
CRA Qualified Investment Fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities AFS	1,061	1,028
CRA Qualified Investment Fund [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities AFS	$ 1,061	$ 1,028

Fair Value Measurements - Ass63

Fair Value Measurements - Assets and Liabilities at Fair Value (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
FHLB and FNBB Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments carried at cost	$ 6.1	$ 23.5

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Information Related to Level 3 Non-Recurring Fair Value Measurements (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value Measurements Disclosure [Line Items]
Impaired non-purchased loans and leases	$ 4,178	$ 9,327
Impaired purchased loans	6,387	8,054
Foreclosed assets	23,328	22,870
Level 3 [Member]
Fair Value Measurements Disclosure [Line Items]
Impaired non-purchased loans and leases	4,178	9,327
Impaired purchased loans	6,387	8,054
Foreclosed assets	$ 23,328	$ 22,870

Fair Value Measurements - Ass65

Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis Utilizing Level 3 Inputs (Detail) - Investment Securities AFS [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning Balance, Asset	$ 18,504	$ 19,401
Total unrealized gains (losses) included in comprehensive income	(48)	(271)
Paydowns and maturities	(565)	(373)
Ending Balance, Asset	$ 17,891	$ 18,757

Fair Value of Financial Instr66

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Investments in bank stock	$ 6.1	$ 23.5

Fair Value of Financial Instr67

Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 23, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities AFS	$ 824,399		$ 602,348
Time deposits	3,411,266		2,438,482
Repurchase agreements with customers	53,997		65,800
Other borrowings	42,053		204,540
Subordinated notes	222,324
Subordinated debentures	117,962	$ 225,000	117,685
Level 1 [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	806,526		90,988
Demand, savings and interest bearing transaction deposits	6,783,806		5,532,986
Repurchase agreements with customers	53,997		65,800
Level 1 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	806,526		90,988
Demand, savings and interest bearing transaction deposits	6,783,806		5,532,986
Repurchase agreements with customers	53,997		65,800
Level 2 and 3 [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities AFS	824,399		602,348
Level 2 and 3 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities AFS	824,399		602,348
Level 3 [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases, net of ALLL	9,664,871		8,273,817
Level 3 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases, net of ALLL	9,556,453		8,165,123
Level 2 [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	3,411,266		2,438,482
Other borrowings	42,053		204,540
Subordinated notes	222,324
Subordinated debentures	117,962		117,685
Level 2 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	3,433,352		2,456,323
Other borrowings	43,420		205,918
Subordinated notes	232,446
Subordinated debentures	$ 91,037		$ 77,534

Repurchase Agreements With Cu68

Repurchase Agreements With Customers - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Disclosure Of Repurchase Agreements [Abstract]
Repurchase agreements with customers	$ 53,997	$ 65,800

Changes in and Reclassificati69

Changes in and Reclassifications from Accumulated Other Comprehensive Income ("AOCI") - Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance of AOCI - unrealized gains and losses on investment securities AFS			$ 7,959
Unrealized gains and losses on investment securities AFS	$ 6,187	$ (10,091)	10,382	$ (7,600)
Tax effect of unrealized gains and losses on investment securities AFS	(1,512)	3,844	(3,235)	3,157
Amounts reclassified from AOCI		(85)		(2,618)
Tax effect of amounts reclassified from AOCI		33		997
Total other comprehensive income (loss)	4,675	(6,299)	7,147	(6,064)
Ending balance of AOCI - unrealized gains and losses on investment securities AFS	15,106		15,106
Unrealized gains and losses on investment securities AFS [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance of AOCI - unrealized gains and losses on investment securities AFS	10,431	14,367	7,959	14,132
Unrealized gains and losses on investment securities AFS	6,187	(10,091)	10,382	(7,600)
Tax effect of unrealized gains and losses on investment securities AFS	(1,512)	3,844	(3,235)	3,157
Amounts reclassified from AOCI		(85)		(2,618)
Tax effect of amounts reclassified from AOCI		33		997
Total other comprehensive income (loss)	4,675	(6,299)	7,147	(6,064)
Ending balance of AOCI - unrealized gains and losses on investment securities AFS	$ 15,106	$ 8,068	$ 15,106	$ 8,068

Other Operating Expenses - Summ

Other Operating Expenses - Summary of Other Operating Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Income And Expenses [Abstract]
Salaries and employee benefits	$ 24,921	$ 22,646	$ 48,282	$ 45,243
Net occupancy and equipment	8,388	7,344	16,918	14,635
Other operating expenses:
Professional and outside services	4,342	2,526	7,563	6,912
Postage and supplies	1,073	1,014	2,131	1,929
Advertising and public relations	1,486	586	2,602	1,169
Telecommunication services	1,703	1,616	3,456	2,964
Software and data processing	1,087	766	1,593	1,515
ATM expense	830	543	1,709	1,251
Travel and meals	1,568	821	3,072	1,617
FDIC insurance	1,200	900	2,400	1,650
FDIC and state assessments	340	331	679	641
Loan collection and repossession expense	683	1,020	1,720	2,753
Writedowns of foreclosed and other assets	590	235	1,260	2,427
Amortization of intangibles	1,557	1,640	3,283	3,236
FHLB prepayment penalty				2,480
Other	1,160	1,736	1,946	3,486
Total non-interest expense	$ 50,928	$ 43,724	$ 98,614	$ 93,908

Subsequent Event - Additional I

Subsequent Event - Additional Information (Detail) $ in Millions	Jul. 22, 2016Office	Jul. 21, 2016USD ($)Officeshares	Jul. 20, 2016USD ($)Officeshares	Jun. 30, 2016USD ($)
Community & Southern Holdings, Inc. [Member]
Subsequent Event [Line Items]
Acquisition completion date				Jul. 20, 2016
Total assets acquired				$ 3,900
Total loans acquired				3,100
Total deposits acquired				3,300
Stockholders equity of acquiree				$ 490
C1 Financial, Inc. [Member]
Subsequent Event [Line Items]
Acquisition completion date				Jul. 21, 2016
Total assets acquired				$ 1,700
Total loans acquired				1,400
Total deposits acquired				1,300
Stockholders equity of acquiree				$ 210
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of bank offices | Office	256
Subsequent Event [Member] | C&S equity awards [Member]
Subsequent Event [Line Items]
Number of common stock issued | shares			784,000
Subsequent Event [Member] | Community & Southern Holdings, Inc. [Member]
Subsequent Event [Line Items]
Number of common stock issued | shares			20,200,000
Total outstanding transaction value			$ 800.3
Subsequent Event [Member] | Community & Southern Holdings, Inc. [Member] | Georgia [Member]
Subsequent Event [Line Items]
Number of bank offices | Office			46
Subsequent Event [Member] | Community & Southern Holdings, Inc. [Member] | Florida [Member]
Subsequent Event [Line Items]
Number of bank offices | Office			1
Subsequent Event [Member] | C1 Financial, Inc. [Member]
Subsequent Event [Line Items]
Number of common stock issued | shares		9,371,000
Total outstanding transaction value		$ 376.1
Subsequent Event [Member] | C1 Financial, Inc. [Member] | Florida [Member]
Subsequent Event [Line Items]
Number of bank offices | Office		33