CenterState Bank (CSFL) 10-Q 1 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Entity Registrant Name	CenterState Bank Corporation
Trading Symbol	CSFL
Entity Central Index Key	1,102,266
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		95,654,854

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 112,943	$ 68,571
Deposits in other financial institutions (restricted cash)	5,236	16,991
Federal funds sold and Federal Reserve Bank deposits	488,152	195,057
Cash and cash equivalents	606,331	280,619
Trading securities, at fair value		6,777
Investment securities available for sale, at fair value	1,536,842	1,060,143
Investment securities held to maturity (fair value of $211,262 and $231,615 at September 30, 2018 and December 31, 2017, respectively)	219,850	232,399
Loans held for sale (see Note 7)	39,554	19,647
Loans, excluding purchased credit impaired	8,055,421	4,609,063
Purchased credit impaired loans	167,671	164,158
Allowance for loan losses	(38,811)	(32,825)
Net Loans	8,184,281	4,740,396
Bank premises and equipment, net	224,506	141,886
Accrued interest receivable	32,972	18,628
Federal Home Loan Bank, Federal Reserve Bank and other stock, at cost	70,311	34,876
Goodwill	802,880	257,683
Core deposit intangible, net	69,133	24,063
Other intangible assets, net	2,925	551
Bank owned life insurance	267,979	146,739
Other repossessed real estate owned	4,643	3,987
Deferred income tax asset, net	60,839	37,725
Bank property held for sale	27,081	11,354
Interest rate swap derivatives, at fair value	87,946	42,480
Prepaid expense and other assets	36,292	64,022
TOTAL ASSETS	12,274,365	7,123,975
Deposits:
Demand - non-interest bearing	3,094,652	1,999,901
Demand - interest bearing	1,702,467	1,058,985
Savings and money market accounts	2,815,119	1,668,954
Time deposits	1,862,288	832,683
Total deposits	9,474,526	5,560,523
Securities sold under agreement to repurchase	51,311	52,080
Federal funds purchased	272,002	331,490
Other borrowed funds	371,000	175,000
Corporate debentures	41,328	26,192
Accrued interest payable	2,570	1,169
Interest rate swap derivatives, at fair value	88,065	43,259
Payables and accrued expenses	60,404	29,512
Total liabilities	10,361,206	6,219,225
Stockholders' equity:
Common stock, $.01 par value: 200,000,000 shares authorized; 95,636,051 and 60,161,334 shares issued and outstanding at September, 2018 and December 31, 2017, respectively	956	602
Additional paid-in capital	1,697,396	737,905
Retained earnings	252,695	173,248
Accumulated other comprehensive loss	(37,888)	(7,005)
Total stockholders' equity	1,913,159	904,750
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 12,274,365	$ 7,123,975

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Held-to-maturity securities, fair value	$ 211,262	$ 231,615
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	95,636,051	60,161,334
Common stock, shares outstanding	95,636,051	60,161,334

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income:
Loans		$ 101,555	$ 59,122	$ 289,127	$ 159,990
Investment securities:
Taxable		10,145	5,648	30,888	16,622
Tax-exempt		1,601	1,400	4,718	3,918
Federal funds sold and other		1,362	887	3,718	2,374
Total interest income		114,663	67,057	328,451	182,904
Interest expense:
Deposits		9,096	3,178	20,900	7,694
Securities sold under agreement to repurchase		169	80	429	157
Federal funds purchased and other borrowings		2,966	866	8,156	2,131
Corporate debentures		579	347	1,566	998
Total interest expense		12,810	4,471	31,051	10,980
Net interest income		101,853	62,586	297,400	171,924
Provision for loan losses		1,950	1,096	6,183	3,990
Net interest income after loan loss provision		99,903	61,490	291,217	167,934
Non interest income:
Correspondent banking capital markets revenue		7,258	5,823	20,156	18,067
Other correspondent banking related revenue		1,038	1,390	3,339	3,658
SBA income		1,020	249	3,035	442
Debit, prepaid, ATM and merchant card related fees		3,869	2,127	11,094	6,716
Wealth management related revenue		676	914	1,932	2,698
Bank owned life insurance income		1,490	975	4,258	2,310
Other non interest income		2,778	989	5,051	2,127
Net loss on sale of securities available for sale				(22)	0
Total other income		27,104	16,741	72,731	48,217
Non interest expense:
Salaries, wages and employee benefits		41,698	28,515	124,274	79,714
Occupancy expense		5,428	3,422	15,264	9,453
Depreciation of premises and equipment		2,439	1,842	7,036	5,363
Supplies, stationary and printing		588	392	1,682	1,180
Marketing expenses		1,493	955	4,332	2,885
Data processing expense		2,729	2,006	10,687	6,251
Legal, audit and other professional fees		1,301	854	3,564	2,674
Amortization of intangibles		2,480	1,133	7,029	2,937
Postage and delivery		711	512	2,145	1,431
ATM and debit card related expenses		972	746	2,596	2,102
Bank regulatory expenses		1,367	666	3,586	2,284
Gain on sale of repossessed real estate (“OREO”)		(294)	(38)	(1,193)	(200)
Valuation write down of repossessed real estate (“OREO”)		170	141	464	612
(Gain) loss on repossessed assets other than real estate		(9)	(13)	10	(19)
Foreclosure related expenses		821	437	2,056	1,665
Merger related expenses		10,395	0	33,244	10,328
Impairment on bank property held for sale		247	0	2,587	507
Other expenses		4,803	3,052	13,584	8,307
Total other expenses		77,339	44,622	232,947	137,474
Income before provision for income taxes		49,668	33,609	131,001	78,677
Provision for income taxes		11,683	11,559	25,217	24,794
Net income		37,985	22,050	105,784	53,883
Other comprehensive (loss) income, net of tax:
Unrealized securities holding (loss) gain, net of income taxes of ($1,979), ($389), ($9,950) and $5,210, respectively		(7,354)	(620)	(30,899)	8,296
Less: reclassified adjustments for loss included in net income, net of income taxes of $0, $0, ($6) and $0, respectively				16
Net unrealized (loss) gain on available for sale securities, net of income taxes		(7,354)	(620)	(30,883)	8,296
Total comprehensive income		$ 30,631	$ 21,430	$ 74,901	$ 62,179
Earnings per share:
Basic		$ 0.43	$ 0.37	$ 1.24	$ 0.95
Diluted		$ 0.43	$ 0.36	$ 1.23	$ 0.94
Common shares used in the calculation of earnings per share:
Basic	[1]	87,813,671	59,906,610	84,958,277	56,315,700
Diluted	[1]	88,810,702	61,115,005	86,209,709	57,330,267
Mortgage Banking Income
Non interest income:
Non interest income		$ 3,188	$ 404	$ 8,406	$ 932
Service Charges on Deposit Accounts
Non interest income:
Non interest income		$ 5,787	$ 3,870	$ 15,482	$ 11,267
[1]	Excludes participating shares.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Unrealized securities holding (loss) gain, income taxes	$ (1,979)	$ (389)	$ (9,950)	$ 5,210
Reclassifications of loss included in net income, income taxes	$ 0	$ 0	$ (6)	$ 0

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Total	Charter Financial Corporation [Member]	Platinum Bank Holding Company [Member]	Gateway Financial Holdings Of Florida Inc [Member]	Sunshine Bancorp, Inc. [Member]	HCBF Holding Company, Inc. [Member]	Common Stock [Member]	Common Stock [Member]Charter Financial Corporation [Member]	Common Stock [Member]Platinum Bank Holding Company [Member]	Common Stock [Member]Gateway Financial Holdings Of Florida Inc [Member]	Common Stock [Member]Sunshine Bancorp, Inc. [Member]	Common Stock [Member]HCBF Holding Company, Inc. [Member]	Additional Paid in Capital [Member]	Additional Paid in Capital [Member]Charter Financial Corporation [Member]	Additional Paid in Capital [Member]Platinum Bank Holding Company [Member]	Additional Paid in Capital [Member]Gateway Financial Holdings Of Florida Inc [Member]	Additional Paid in Capital [Member]Sunshine Bancorp, Inc. [Member]	Additional Paid in Capital [Member]HCBF Holding Company, Inc. [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balances at beginning at Dec. 31, 2016	$ 552,457						$ 482						$ 430,459						$ 130,090	$ (8,574)
Balances at beginning, shares at Dec. 31, 2016							48,146,981
Net income	53,883																		53,883
Unrealized holding gain (loss) on available for sale securities, net of deferred income tax	8,296																			8,296
Dividends paid - common	(10,269)																		(10,269)
Stock grants issued	403						$ 2						401
Stock grants issued, shares							240,075
Stock based compensation expense	3,333												3,333
Stock options exercised	5,313						$ 5						5,308
Stock options exercised, Shares							479,864
Stock repurchase	(787)						$ (1)						(786)
Stock repurchase, shares							(32,224)
Stock issued pursuant to acquisition			$ 110,833	$ 107,087					$ 43	$ 43					$ 110,790	$ 107,044
Stock issued pursuant to acquisition, shares									4,279,255	4,244,441
Stock options acquired and converted pursuant to acquisition				$ 15,811												$ 15,811
Stock issued pursuant to public offering, net of costs, shares							2,695,000
Stock issued pursuant to public offering, net of costs of $529	63,262						$ 27						63,235
Balances at ending at Sep. 30, 2017	909,622						$ 601						735,595						173,704	(278)
Balances at ending, shares at Sep. 30, 2017							60,053,392
Balances at beginning at Jun. 30, 2017	890,258						$ 600						734,059						155,257	342
Balances at beginning, shares at Jun. 30, 2017							60,002,604
Net income	22,050																		22,050
Unrealized holding gain (loss) on available for sale securities, net of deferred income tax	(620)																			(620)
Dividends paid - common	(3,603)																		(3,603)
Stock grants issued	183												183
Stock grants issued, shares							22,641
Stock based compensation expense	1,080												1,080
Stock options exercised	304						$ 1						303
Stock options exercised, Shares							29,319
Stock repurchase	(30)												(30)
Stock repurchase, shares							(1,172)
Balances at ending at Sep. 30, 2017	909,622						$ 601						735,595						173,704	(278)
Balances at ending, shares at Sep. 30, 2017							60,053,392
Balances at beginning at Dec. 31, 2017	$ 904,750						$ 602						737,905						173,248	(7,005)
Balances at beginning, shares at Dec. 31, 2017	60,161,334						60,161,334
Net income	$ 105,784																		105,784
Unrealized holding gain (loss) on available for sale securities, net of deferred income tax	(30,883)																			(30,883)
Dividends paid - common	(26,337)																		(26,337)
Stock grants issued	650						$ 2						648
Stock grants issued, shares							235,521
Stock based compensation expense	3,012												3,012
Stock options exercised	14,252						$ 18						14,234
Stock options exercised, Shares							1,751,194
Stock repurchase	(1,027)						$ (1)						(1,026)
Stock repurchase, shares							(38,496)
Stock issued pursuant to acquisition		$ 349,809			$ 181,413	$ 387,279		$ 114			$ 70	$ 151		$ 349,695			$ 181,343	$ 387,128
Stock issued pursuant to acquisition, shares								11,424,214			7,050,645	15,051,639
Stock options acquired and converted pursuant to acquisition					$ 6,432	$ 18,025											$ 6,432	$ 18,025
Balances at ending at Sep. 30, 2018	$ 1,913,159						$ 956						1,697,396						252,695	(37,888)
Balances at ending, shares at Sep. 30, 2018	95,636,051						95,636,051
Balances at beginning at Jun. 30, 2018	$ 1,540,248						$ 841						1,345,671						224,270	(30,534)
Balances at beginning, shares at Jun. 30, 2018							84,120,421
Net income	37,985																		37,985
Unrealized holding gain (loss) on available for sale securities, net of deferred income tax	(7,354)																			(7,354)
Dividends paid - common	(9,560)																		(9,560)
Stock grants issued	650												650
Stock grants issued, shares							40,370
Stock based compensation expense	1,012												1,012
Stock options exercised	398						$ 1						397
Stock options exercised, Shares							52,036
Stock repurchase	(29)												(29)
Stock repurchase, shares							(990)
Stock issued pursuant to acquisition		$ 349,809						$ 114						$ 349,695
Stock issued pursuant to acquisition, shares								11,424,214
Balances at ending at Sep. 30, 2018	$ 1,913,159						$ 956						$ 1,697,396						$ 252,695	$ (37,888)
Balances at ending, shares at Sep. 30, 2018	95,636,051						95,636,051

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Member]
Unrealized holding gain on available for sale securities, deferred income tax	$ 1,979	$ 389	$ 9,966	$ 5,210
Retained Earnings [Member]
Dividends paid - common, per share	$ 0.10	$ 0.12	$ 0.30	$ 0.18
Additional Paid in Capital [Member]
Public Offering Costs				$ 529

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 105,784	$ 53,883
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	6,183	3,990
Depreciation of premises and equipment	7,036	5,363
Accretion of purchase accounting adjustments	(37,725)	(26,653)
Net amortization of investment securities	9,713	7,389
Net deferred loan origination fees	1,277	314
Loss on sale of securities available for sale	22	0
Trading securities revenue	(12)	(192)
Purchases of trading securities	(234,190)	(186,523)
Proceeds from sale of trading securities	240,979	196,125
Repossessed real estate owned valuation write down	464	612
Gain on sale of repossessed real estate owned	(1,193)	(200)
Loss (gain) on repossessed assets other than real estate	10	(19)
Gain on sale of residential loans held for sale	(6,612)	(932)
Residential loans originated and held for sale	(242,226)	(53,806)
Proceeds from sale of residential loans held for sale	238,613	44,780
Change in fair value of residential loans held for sale	(723)	0
Gain on disposal of and or sale of fixed assets	(762)	(217)
Gain on disposal of bank property held for sale	(1,745)	(304)
Impairment on bank property held for sale	2,587	507
Gain on sale of small business administration loans	(3,035)	(442)
Small business administration loans originated for sale	(29,448)	(6,623)
Proceeds from sale of small business administration loans	32,483	7,065
Gain on sale of deposits	(611)	0
Deferred income taxes	14,559	10,018
Tax deduction in excess of book deduction for stock awards	(6,017)	(2,407)
Stock based compensation expense	3,012	3,333
Bank owned life insurance income	(4,258)	(2,310)
Net cash from changes in:
Net changes in accrued interest receivable, prepaid expenses, and other assets	56,911	5,447
Net change in accrued interest payable, accrued expense, and other liabilities	2,509	7,973
Net cash provided by operating activities	153,585	66,171
Cash flows from investing activities:
Purchases of investment securities	(94,602)	(46,472)
Purchases of mortgage backed securities	(290,645)	(165,347)
Proceeds from pay-downs of mortgage backed securities	161,779	91,530
Proceeds from sales of investment securities	58,768	104,260
Proceeds from sales of mortgage backed securities	305,384	156,564
Proceeds from called investment securities	1,045	710
Proceeds from maturities of investment securities	61,000	1,000
Purchases of investment securities	0	(2,693)
Purchases of mortgage backed securities	0	(1,695)
Proceeds from pay-downs of mortgage backed securities	11,513	15,797
Purchases of FHLB and FRB stock	(17,398)	(9,304)
Proceeds from sales of FHLB and FRB stock	20,944	5,572
Net increase in loans	(259,358)	(202,434)
Purchases of premises and equipment, net	(17,525)	(8,124)
Proceeds from sale of repossessed real estate	9,201	3,794
Proceeds from sale of fixed assets	2,661	548
Proceeds from sale of bank property held for sale	12,350	6,413
Purchase of bank owned life insurance	0	(30,000)
Net cash from bank acquisitions	229,689	86,530
Net cash provided by investing activities	194,806	6,649
Cash flows from financing activities:
Net increase in deposits	93,831	45,367
Sale of deposits	25,341	0
Net (decrease) increase in securities sold under agreement to repurchase	(1,122)	12,104
Net (decrease) increase in federal funds purchased	(59,488)	73,545
Net decrease in other borrowings	(67,920)	(134,732)
Net decrease in payable to shareholders for acquisitions	(209)	(48)
Stock options exercised	14,252	5,313
Proceeds from stock offering, net of offering costs	0	63,262
Stock repurchased	(1,027)	(787)
Dividends paid	(26,337)	(10,269)
Net cash (used in) provided by financing activities	(22,679)	53,755
Net increase in cash and cash equivalents	325,712	126,575
Cash and cash equivalents, beginning of period	280,619	175,654
Cash and cash equivalents, end of period	606,331	302,229
Transfer of loans to other real estate owned	3,727	2,614
Transfers of bank property to held for sale	3,502	4,136
Cash paid during the period for:
Interest	31,655	12,323
Income taxes	$ 11,299	$ 8,893

Nature of Operations and Basis

Nature of Operations and Basis of Presentation	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Nature of Operations and Basis of Presentation	NOTE 1: Nature of operations and basis of presentation The consolidated financial statements include the accounts of CenterState Bank Corporation (the “Parent Company,” “Company” or “CSFL”), and its wholly owned subsidiary bank, CenterState Bank, N.A. (“CenterState” or “Bank”), and non-bank subsidiaries, R4ALL, Inc. and CSFL Insurance Corp. The Company operates as one of the largest community bank franchises headquartered in the state of Florida. The Bank provides traditional retail, commercial, mortgage, wealth management and SBA services throughout its Florida, Georgia and Alabama branch network and customer relationships in neighboring states. The Bank also operates a correspondent banking and capital markets division headquartered in Winter Haven, Florida, although the majority of its bond salesmen, traders and operational personnel are physically housed in leased facilities located in Birmingham, Alabama and Atlanta, Georgia. This division’s primary revenue generating activities are related to its capital markets division, which includes commissions earned on fixed income security sales, fees from hedging services, loan brokerage fees and consulting fees for services related to these activities; and its correspondent banking division, which includes spread income earned on correspondent bank deposits (i.e. federal funds purchased) and correspondent bank checking account deposits and fees from safe-keeping activities, bond accounting services for correspondents, asset/liability consulting related activities, international wires, and other clearing and corporate checking account services. The customer base includes small to medium size financial institutions primarily located in the Southeastern United States. R4ALL, Inc. purchases troubled loans from the Bank and manages their eventual disposition. CSFL Insurance Corp. is a captive insurance subsidiary pursuant to Section 831(b) of the U.S. Tax Code. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial statements and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. These statements should be read in conjunction with the consolidated financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2017. In the Company’s opinion, all adjustments, consisting primarily of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods have been made. The results of operations of the three and nine month periods ended September 30, 2018 are not necessarily indicative of the results expected for the full year. Some items in the prior period financial statements were reclassified to conform to the current presentation. Reclassifications had no effect on prior period net income or shareholders’ equity.

Common Stock Outstanding and Ea

Common Stock Outstanding and Earnings Per Share Data	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Common Stock Outstanding and Earnings Per Share Data	NOTE 2: Common stock outstanding and earnings per share data The two-class method is used in the calculation of basic and diluted earnings per share. Under the two-class method, earnings available to common shareholders for the period are allocated between common shareholders and participating securities according to dividends declared (or accumulated) and participation rights in undistributed earnings. There were 0 Three months ended September 30, Nine months ended September 30, 2018 2017 2018 2017 Basic Net income available to common shareholders $ 37,985 $ 22,050 $ 105,784 $ 53,883 Less: Earnings allocated to participating securities (28 ) (46 ) (84 ) (121 ) Net income allocated to common shareholders $ 37,957 $ 22,004 $ 105,700 $ 53,762 Weighted average common shares outstanding including participating securities 87,881,806 60,032,804 85,026,929 56,442,506 Less: Participating securities (1) (68,135 ) (126,194 ) (68,652 ) (126,806 ) Average shares 87,813,671 59,906,610 84,958,277 56,315,700 Basic earnings per common share $ 0.43 $ 0.37 $ 1.24 $ 0.95 Diluted Net income available to common shareholders $ 37,957 $ 22,004 $ 105,700 $ 53,762 Weighted average common shares outstanding for basic earnings per common share 87,813,671 59,906,610 84,958,277 56,315,700 Add: Dilutive effects of stock based compensation awards 997,031 1,208,395 1,251,432 1,014,567 Average shares and dilutive potential common shares 88,810,702 61,115,005 86,209,709 57,330,267 Diluted earnings per common share $ 0.43 $ 0.36 $ 1.23 $ 0.94 1. Participating securities are restricted stock awards whereby the stock certificates have been issued, are included in outstanding shares, receive dividends and can be voted, but have not vested.

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value	NOTE 3: Fair value Generally accepted accounting principles establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing and asset or liability. The fair values of securities available for sale, excluding corporate debt securities, are determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1 inputs) or matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2 inputs). The fair values of corporate debt securities are calculated using market indicators such as broker quotes (Level 2). The fair values of trading securities are determined as follows: (1) for those securities that have traded prior to the date of the consolidated balance sheet but have not settled (date of sale) until after such date, the sales price is used as the fair value (Level 1); and, (2) for those securities which have not traded as of the date of the consolidated balance sheet, the fair value was determined by broker price indications of similar or same securities (Level 2). For periods prior to December 31, 2017, mortgage loans held for sale were valued at the lower of cost or fair value . Effective January 1, 2018, the Company elected to account for these loans under the fair value option with changes in fair value recognized in current period earnings. These loans are intended for sale and the Company believes that the fair value is the best indicator of the resolution of these loans (Level 2) . In conjunction with the fair value election on loans held for sale, Mortgage banking uses derivative forward sales contracts and interest rate lock commitments on residential mortgage loans. Fair values of these mortgage derivatives are estimated based on changes in mortgage interest rates from the date the interest on the loan is locked (Level 3). The fair value of interest rate swap derivatives is based on valuation models using observable market data as of the measurement date (Level 2). The derivatives are traded in an over-the-counter market where quoted market prices are not always available. Therefore, fair values of derivatives are determined using quantitative models that utilize multiple market inputs. The inputs will vary based on the type of derivative, but could include interest rates, prices and indices to generate continuous yield or pricing curves, prepayment rates, and volatility factors to value the position. The majority of market inputs are actively quoted and can be validated through external sources, including brokers, market transactions and third-party pricing services. Assets and liabilities measured at fair value on a recurring basis are summarized below. Fair value measurements using Quoted prices Significant in active other Significant markets for observable unobservable Carrying identical assets inputs inputs value (Level 1) (Level 2) (Level 3) at September 30, 2018 Assets: Available for sale securities Corporate debt securities $ 6,361 — $ 6,361 — Obligations of U.S. government sponsored entities and agencies 39,644 — 39,644 — Mortgage backed securities 1,412,459 — 1,412,459 — Municipal securities 78,378 — 78,378 — Loans held for sale, at fair value 39,554 — 39,554 — Mortgage banking derivatives 938 — — 938 Interest rate swap derivatives 87,946 — 87,946 — Liabilities: Mortgage banking derivatives 27 — — 27 Interest rate swap derivatives 88,065 — 88,065 — at December 31, 2017 Assets: Trading securities $ 6,777 — $ 6,777 — Available for sale securities U.S. Treasury securities 5,200 — 5,200 — Obligations of U.S. government sponsored entities and agencies 9,574 — 9,574 — Mortgage backed securities 972,611 — 972,611 — Municipal securities 72,758 — 72,758 — Interest rate swap derivatives 42,480 — 42,480 — Liabilities: Interest rate swap derivatives 43,259 — 43,259 — The fair value of impaired loans with specific valuation allowance for loan losses and other real estate owned is based on recent real estate appraisals. For residential real estate impaired loans and other real estate owned, appraised values are based on the comparative sales approach. For commercial and commercial real estate impaired loans, and other real estate owned, appraisers may use either a single valuation approach or a combination of approaches such as comparative sales, cost or the income approach. A significant unobservable input in the income approach is the estimated income capitalization rate for a given piece of collateral. At September 30, 2018, the range of capitalization rates utilized to determine the fair value of the underlying collateral ranged from 7% to 10%. Adjustments to appraisals may be made by the appraiser to reflect local market conditions or other economic factors and may result in changes in the fair value of a given asset over time. As such, the fair value of impaired loans , other real estate owned and bank property held for sale are considered a Level 3 in the fair value hierarchy . Assets and liabilities measured at fair value on a non-recurring basis are summarized below. Fair value measurements using Significant Quoted prices in other Significant active markets for observable unobservable Carrying identical assets inputs inputs value (Level 1) (Level 2) (Level 3) at September 30, 2018 Assets: Impaired loans Residential real estate $ 2,312 — — $ 2,312 Commercial real estate 5,350 — — 5,350 Land, land development and construction 942 — — 942 Commercial 251 — — 251 Consumer 52 — — 52 Other real estate owned Residential real estate 117 117 Commercial real estate 261 — — 261 Land, land development and construction 1,312 — — 1,312 Bank property held for sale 5,805 — — 5,805 at December 31, 2017 Assets: Impaired loans Residential real estate $ 2,423 — — $ 2,423 Commercial real estate 6,293 — — 6,293 Land, land development and construction 292 — — 292 Commercial 2,131 — — 2,131 Consumer 57 — — 57 Other real estate owned Residential real estate 635 — — 635 Commercial real estate 261 — — 261 Land, land development and construction 1,481 — — 1,481 Bank property held for sale 1,516 — — 1,516 Impaired loans measured at fair value had a recorded investment of $10,102 with a valuation allowance of $1,195, at September 30, 2018, and a recorded investment of $11,673, with a valuation allowance of $477, at December 31, 2017. The Company recorded a provision for loan loss expense of $682 and $1,026 on these loans during the three and nine month periods ending September 30, 2018. The Company recorded provision for loan loss expense of $384 and $779 on impaired loans carried at fair value during three and nine month periods ending September 30, 2017. Other real estate owned had a decline in fair value of $170, $141, $464 and $612 during Bank property held for sale represents certain branch office buildings which the Company has closed and consolidated with other existing branches. The real estate was transferred out of the Bank Premises and Equipment category into bank property held for sale at the lower of amortized cost or fair value less estimated costs to sell. The fair values were based upon appraisals. The Company recognized an impairment charge of $247, $0, $2,587 and $507 during the three and nine month periods ending , respectively, related to bank properties held for sale Fair Value of Financial Instruments The methods and assumptions, not previously presented, used to estimate fair value are described as follows: Cash and Cash Equivalents: FHLB, FRB and Other Stock Investment securities held to maturity Loans, net Accrued Interest Receivable Deposits Short-term Borrowings Corporate Debentures Accrued Interest Payable Off-balance Sheet Instruments The following table presents the carry amounts and estimated fair values of the Company’s financial instruments: Fair value measurements at September 30, 2018 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 606,331 $ 606,331 $ — $ — $ 606,331 Investment securities available for sale 1,536,842 — 1,536,842 — 1,536,842 Investment securities held to maturity 219,850 — 211,262 — 211,262 FHLB, FRB and other stock 70,311 — — — n/a Loans held for sale, at fair value 39,554 — 39,554 — 39,554 Loans, net 8,184,281 — — 8,125,840 8,125,840 Mortgage banking derivatives 938 — — 938 938 Interest rate swap derivatives 87,946 — 87,946 — 87,946 Accrued interest receivable 32,972 — 6,798 26,174 32,972 Financial liabilities: Deposits- without stated maturities $ 7,612,238 $ 7,612,238 $ — $ — $ 7,612,238 Deposits- with stated maturities 1,862,288 — 1,867,827 — 1,867,827 Securities sold under agreement to repurchase 51,311 — 51,311 — 51,311 Federal funds purchased and other borrowings 643,002 — 643,002 — 643,002 Corporate debentures 41,328 — — 37,928 37,928 Mortgage banking derivatives 27 — — 27 27 Interest rate swap derivatives 88,065 — 88,065 — 88,065 Accrued interest payable 2,570 — 2,570 — 2,570 Fair value measurements at December 31, 2017 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 280,619 $ 280,619 $ — $ — $ 280,619 Trading securities 6,777 — 6,777 — 6,777 Investment securities available for sale 1,060,143 — 1,060,143 — 1,060,143 Investment securities held to maturity 232,399 — 231,615 — 231,615 FHLB and FRB stock 34,876 — — — n/a Loans held for sale 19,647 — 19,647 — 19,647 Loans, net 4,740,396 — — 4,731,514 4,731,514 Interest rate swap derivatives 42,480 — 42,480 — 42,480 Accrued interest receivable 18,628 — 5,370 13,258 18,628 Financial liabilities: Deposits- without stated maturities $ 4,727,840 $ 4,727,840 $ — $ — $ 4,727,840 Deposits- with stated maturities 832,683 — 845,039 — 845,039 Securities sold under agreement to repurchase 52,080 — 52,080 — 52,080 Federal funds purchased and other borrowings 506,490 — 506,490 — 506,490 Corporate debentures 26,192 — — 22,363 22,363 Interest rate swap derivatives 43,259 — 43,259 — 43,259 Accrued interest payable 1,169 — 1,169 — 1,169

Reportable Segments

Reportable Segments	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Reportable Segments	NOTE 4: Reportable segments The Company’s reportable segments represent the distinct product lines the Company offers and are viewed separately for strategic planning purposes by management. The table below is a reconciliation of the reportable segment revenues, expenses, and profit to the Company’s consolidated total for the three and nine month periods ending September 30, 2018 and 2017. Three month period ending September 30, 2018 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 110,764 $ 3,899 $ — $ — $ 114,663 Interest expense (9,992 ) (2,005 ) (813 ) — (12,810 ) Net interest income (expense) 100,772 1,894 (813 ) — 101,853 Provision for loan losses (1,965 ) 15 — — (1,950 ) Non interest income 18,808 8,296 — — 27,104 Non interest expense (70,652 ) (5,678 ) (1,009 ) — (77,339 ) Net income (loss) before taxes 46,963 4,527 (1,822 ) — 49,668 Income tax (provision) benefit (11,086 ) (1,147 ) 550 — (11,683 ) Net income $ 35,877 $ 3,380 $ (1,272 ) $ — $ 37,985 Total assets $ 11,604,329 $ 661,880 $ 1,969,635 $ (1,961,479 ) $ 12,274,365 Nine month period ending September 30, 2018 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 317,851 $ 10,600 $ — $ — $ 328,451 Interest expense (23,689 ) (4,734 ) (2,628 ) — (31,051 ) Net interest income (expense) 294,162 5,866 (2,628 ) — 297,400 Provision for loan losses (6,039 ) (144 ) — — (6,183 ) Non interest income 49,228 23,495 8 — 72,731 Non interest expense (213,934 ) (16,172 ) (2,841 ) — (232,947 ) Net income (loss) before taxes 123,417 13,045 (5,461 ) — 131,001 Income tax (provision) benefit (28,585 ) (3,305 ) 6,673 — (25,217 ) Net income (loss) $ 94,832 $ 9,740 $ 1,212 $ — $ 105,784 Total assets $ 11,604,329 $ 661,880 $ 1,969,635 $ (1,961,479 ) $ 12,274,365 Three month period ending September 30, 2017 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 64,410 $ 2,647 $ — $ — $ 67,057 Interest expense (3,305 ) (819 ) (347 ) — (4,471 ) Net interest income (expense) 61,105 1,828 (347 ) — 62,586 Provision for loan losses (1,113 ) 17 — — (1,096 ) Non interest income 9,528 7,213 — — 16,741 Non interest expense (38,432 ) (5,304 ) (886 ) — (44,622 ) Net income (loss) before taxes 31,088 3,754 (1,233 ) — 33,609 Income tax (provision) benefit (10,579 ) (1,448 ) 468 — (11,559 ) Net income $ 20,509 $ 2,306 $ (765 ) $ — $ 22,050 Total assets $ 6,319,532 $ 498,669 $ 940,571 $ (935,911 ) $ 6,822,861 Nine month period ending September 30, 2017 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 175,015 $ 7,889 $ — $ — $ 182,904 Interest expense (7,934 ) (2,048 ) (998 ) — (10,980 ) Net interest income (expense) 167,081 5,841 (998 ) — 171,924 Provision for loan losses (4,073 ) 83 — — (3,990 ) Non interest income 26,493 21,724 — — 48,217 Non interest expense (119,304 ) (15,594 ) (2,576 ) — (137,474 ) Net income (loss) before taxes 70,197 12,054 (3,574 ) — 78,677 Income tax (provision) benefit (22,900 ) (4,649 ) 2,755 — (24,794 ) Net income (loss) $ 47,297 $ 7,405 $ (819 ) $ — $ 53,883 Total assets $ 6,319,532 $ 498,669 $ 940,571 $ (935,911 ) $ 6,822,861 Commercial and retail banking Correspondent banking and capital markets division Corporate overhead and administration

Investment securities

Investment securities	9 Months Ended
	Sep. 30, 2018
Investments Debt And Equity Securities [Abstract]
Investment securities	NOTE 5: Investment securities Available-for-Sale All of the mortgage backed securities listed below were issued by U.S. government sponsored entities and agencies, primarily Fannie Mae, Freddie Mac and Ginnie Mae, institutions which the government has affirmed its commitment to support. The fair value of available for sale securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) were as follows: September 30, 2018 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value Corporate debt securities $ 6,265 $ 96 $ — $ 6,361 Obligations of U.S. government sponsored entities and agencies 40,882 6 1,244 39,644 Mortgage backed securities 1,460,552 54 48,147 1,412,459 Municipal securities 79,375 151 1,148 78,378 Total available-for-sale $ 1,587,074 $ 307 $ 50,539 $ 1,536,842 December 31, 2017 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities $ 5,000 $ 200 $ — $ 5,200 Obligations of U.S. government sponsored entities and agencies 10,000 — 426 9,574 Mortgage backed securities 982,565 752 10,706 972,611 Municipal securities 71,961 863 66 72,758 Total available-for-sale $ 1,069,526 $ 1,815 $ 11,198 $ 1,060,143 The cost of securities sold is determined using the specific identification method. The securities sold during the first quarter of 2018 include some securities acquired through the acquisitions of Sunshine Bancorp, Inc. (“Sunshine”) and HCBF Holding Company, Inc. (“Harbor”) on January 1, 2018. These acquired securities were marked to fair value and subsequently sold after the acquisition date, and no gain or loss was recognized from the sale of these securities. Sales of available for sale securities for the nine months ended September 30, 2018 and 2017 were as follows: For the nine months ended: September 30, 2018 September 30, 2017 Proceeds $ 364,152 $ 260,824 Gross gains 68 — Gross losses 90 — The tax provision related to these net realized gains was ($6) and $0, respectively. The fair value of available for sale securities at September 30, 2018 by contractual maturity were as follows. Securities not due at a single maturity date, primarily mortgage-backed securities, are shown separately. Fair Amortized Investment securities available for sale: Value Cost Due one year or less $ 782 $ 781 Due after one year through five years 5,537 5,502 Due after five years through ten years 29,657 30,535 Due after ten years through thirty years 88,407 89,704 Mortgage backed securities 1,412,459 1,460,552 Total available-for-sale $ 1,536,842 $ 1,587,074 Available for sale securities pledged at September 30, 2018 and December 31, 2017 had a carrying amount (estimated fair value) of $884,542 and $255,788 respectively. These securities were pledged primarily to increase borrowing capacity at the FHLB, secure public deposits and repurchase agreements. At September 30, 2018 and December 31, 2017, there were no holdings of securities of any one issuer, other than mortgage backed securities issued by U.S. Government sponsored entities, in an amount greater than 10% of stockholders’ equity. The following tables show the Company’s available for sale investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2018 and December 31, 2017. September 30, 2018 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Obligations of U.S. government sponsored entities and agencies $ 27,193 $ 352 $ 9,108 $ 892 $ 36,301 $ 1,244 Mortgage backed securities 1,047,726 29,046 360,105 19,101 1,407,831 48,147 Municipal securities 70,028 1,148 — — 70,028 1,148 Total temporarily impaired available-for-sale securities $ 1,144,947 $ 30,546 $ 369,213 $ 19,993 $ 1,514,160 $ 50,539 December 31, 2017 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Obligations of U.S. government sponsored entities and agencies $ — $ — $ 9,574 $ 426 $ 9,574 $ 426 Mortgage backed securities 477,925 3,298 316,066 7,408 793,991 10,706 Municipal securities 11,698 66 — — 11,698 66 Total temporarily impaired available-for-sale securities $ 489,623 $ 3,364 $ 325,640 $ 7,834 $ 815,263 $ 11,198 At September 30, 2018, 100% of the mortgage-backed securities held by the Company were issued by U.S. government-sponsored entities and agencies, primarily Fannie Mae, Freddie Mac, and Ginnie Mae, institutions which the government has affirmed its commitment to support. Because the decline in fair value is attributable to changes in interest rates and illiquidity, and not credit quality, and because the Company does not intend to sell these mortgage-backed securities or more likely than not will not be required to sell these securities before their anticipated recovery, the Company does not consider these securities to be other-than-temporarily impaired at September 30, 2018. Unrealized losses on municipal securities have not been recognized into income because the issuers bonds are of high quality, and because management does not intend to sell these investments or more likely than not will not be required to sell these investments before their anticipated recovery. The fair value is expected to recover as the securities approach maturity. Held-to-Maturity The following reflects the fair value of held-to-maturity securities and the related gross unrecognized gains and losses as of September 30, 2018 and December 31, 2017. September 30, 2018 Gross Gross Amortized Unrecognized Unrecognized Fair Cost Gains Losses Value Mortgage backed securities $ 87,872 $ — $ 3,627 $ 84,245 Municipal securities 131,978 410 5,371 127,017 Total held-to-maturity $ 219,850 $ 410 $ 8,998 $ 211,262 December 31, 2017 Gross Gross Amortized Unrecognized Unrecognized Fair Cost Gains Losses Value Mortgage backed securities $ 100,039 $ — $ 1,068 $ 98,971 Municipal securities 132,360 1,781 1,497 132,644 Total held to maturity $ 232,399 $ 1,781 $ 2,565 $ 231,615 Held-to-maturity securities pledged at September 30, 2018 and December 31, 2017 had a carrying amount of $104,650 and $97,389 respectively. These securities were pledged primarily to secure public deposits and repurchase agreements. At September 30, 2018, there were no holdings of held-to-maturity securities of any one issuer in an amount greater than 10% of stockholders’ equity. The fair value and amortized cost of held-to-maturity securities at September 30, 2018 by contractual maturity were as follows. Mortgage-backed securities are not due at a single maturity date and are shown separately. Fair Amortized Investment securities held-to-maturity Value Cost Due after five years through ten years $ 2,039 $ 2,048 Due after ten years through thirty years 124,978 129,930 Mortgage backed securities 84,245 87,872 Total held-to-maturity $ 211,262 $ 219,850 The following table shows the Company’s held-to-maturity investments’ gross unrecognized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrecognized loss position, at September 30, 2018 and December 31, 2017. September 30, 2018 Less than 12 months 12 months or more Total Fair Unrecognized Fair Unrecognized Fair Unrecognized Value Losses Value Losses Value Losses Mortgage backed securities $ 22,791 $ 924 $ 61,454 $ 2,703 $ 84,245 $ 3,627 Municipal securities 57,662 1,558 37,428 3,813 95,090 5,371 Total temporarily impaired held-to-maturity securities $ 80,453 $ 2,482 $ 98,882 $ 6,516 $ 179,335 $ 8,998 December 31, 2017 Less than 12 months 12 months or more Total Fair Unrecognized Fair Unrecognized Fair Unrecognized Value Losses Value Losses Value Losses Mortgage backed securities $ 57,266 $ 451 $ 41,705 $ 617 $ 98,971 $ 1,068 Municipal securities 13,350 186 37,963 1,311 51,313 1,497 Total temporarily impaired held-to-maturity securities $ 70,616 $ 637 $ 79,668 $ 1,928 $ 150,284 $ 2,565 At September 30, 2018, 100% of the mortgage-backed securities held by the Company were issued by U.S. government-sponsored entities and agencies, primarily Fannie Mae, Freddie Mac, and Ginnie Mae, institutions which the government has affirmed its commitment to support. Because the decline in fair value is attributable to changes in interest rates and illiquidity, and not credit quality, and because the Company does not intend to sell these mortgage-backed securities or more likely than not will not be required to sell the securities before their anticipated recovery, the Company does not consider these securities to be other-than-temporarily impaired at September 30, 2018. Unrealized losses on municipal securities have not been recognized into income because the issuers bonds are of high quality, and because management does not intend to sell these investments or more likely than not will not be required to sell these investments before their anticipated recovery. The fair value is expected to recover as the securities approach maturity.

Loans

Loans	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Loans	NOTE 6: Loans The following table sets forth information concerning the loan portfolio by collateral types as of the dates indicated. September 30, 2018 December 31, 2017 Loans excluding PCI loans Real estate loans Residential $ 1,713,093 $ 1,025,303 Commercial 4,395,351 2,546,143 Land, development and construction 645,885 235,816 Total real estate 6,754,329 3,807,262 Commercial 1,104,392 693,501 Consumer and other loans 194,603 107,480 Loans before unearned fees and deferred cost 8,053,324 4,608,243 Net unearned fees and costs 2,097 820 Total loans excluding PCI loans 8,055,421 4,609,063 PCI loans (note 1) Real estate loans Residential 62,507 59,975 Commercial 92,444 92,791 Land, development and construction 6,955 6,656 Total real estate 161,906 159,422 Commercial 5,479 4,444 Consumer and other loans 286 292 Total PCI loans 167,671 164,158 Total loans 8,223,092 4,773,221 Allowance for loan losses for loans that are not PCI loans (38,595 ) (32,530 ) Allowance for loan losses for PCI loans (216 ) (295 ) Total loans, net of allowance for loan losses $ 8,184,281 $ 4,740,396 N ote 1: Purchased credit impaired (“PCI”) loans are being accounted for pursuant to ASC Topic 310-30. The table below set forth the activity in the allowance for loan losses for the periods presented. Allowance for loan losses for loans that are not PCI loans Allowance for loan losses on PCI loans Total Three months ended September 30, 2018 Balance at beginning of period $ 37,209 $ 275 $ 37,484 Loans charged-off (1,178 ) — (1,178 ) Recoveries of loans previously charged-off 555 — 555 Net charge-offs (623 ) — (623 ) Provision for loan losses 2,009 (59 ) 1,950 Balance at end of period $ 38,595 $ 216 $ 38,811 Three months ended September 30, 2017 Balance at beginning of period $ 29,769 $ 363 $ 30,132 Loans charged-off (472 ) — (472 ) Recoveries of loans previously charged-off 1,072 — 1,072 Net recoveries 600 — 600 Provision for loan losses 1,174 (78 ) 1,096 Balance at end of period $ 31,543 $ 285 $ 31,828 Allowance for loan losses for loans that are not PCI loans Allowance for loan losses on PCI loans Total Nine months ended September 30, 2018 Balance at beginning of period $ 32,530 $ 295 $ 32,825 Loans charged-off (2,170 ) — (2,170 ) Recoveries of loans previously charged-off 1,898 75 1,973 Net (charge-offs) recoveries (272 ) 75 (197 ) Provision for loan losses 6,337 (154 ) 6,183 Balance at end of period $ 38,595 216 $ 38,811 Nine months ended September 30, 2017 Balance at beginning of period $ 26,569 $ 472 $ 27,041 Loans charged-off (1,722 ) — (1,722 ) Recoveries of loans previously charged-off 2,454 65 2,519 Net recoveries 732 65 797 Provision for loan losses 4,242 (252 ) 3,990 Balance at end of period $ 31,543 $ 285 $ 31,828 The following tables present the activity in the allowance for loan losses by portfolio segment for the periods presented. Real Estate Loans Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses for loans that are not PCI loans: Three months ended September 30, 2018 Beginning of the period $ 5,847 $ 21,921 $ 1,629 $ 5,412 $ 2,400 $ 37,209 Charge-offs (283 ) — (62 ) (327 ) (506 ) (1,178 ) Recoveries 217 113 2 152 71 555 Provision for loan losses 71 916 21 404 597 2,009 Balance at end of period $ 5,852 $ 22,950 $ 1,590 $ 5,641 $ 2,562 $ 38,595 Three months ended September 30, 2017 Beginning of the period $ 6,134 $ 17,238 $ 1,175 $ 3,590 $ 1,632 $ 29,769 Charge-offs (108 ) (8 ) — (140 ) (216 ) $ (472 ) Recoveries 290 320 353 82 27 $ 1,072 Provision for loan losses (292 ) 1,074 (393 ) 458 327 $ 1,174 Balance at end of period $ 6,024 $ 18,624 $ 1,135 $ 3,990 $ 1,770 $ 31,543 Real Estate Loans Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses for loans that are PCI loans: Three months ended September 30, 2018 Beginning of the period $ — $ 59 $ 202 $ — $ 14 $ 275 Charge-offs — — — — — — Recoveries — — — — — — Provision for loan losses — (59 ) — — — (59 ) Balance at end of period $ — $ — $ 202 $ — $ 14 $ 216 Three months ended September 30, 2017 Beginning of the period $ 50 $ 123 $ 176 $ — $ 14 $ 363 Charge-offs — — — — — — Recoveries — — — — — — Provision for loan losses (50 ) (65 ) 37 — — (78 ) Balance at end of period $ — $ 58 $ 213 $ — $ 14 $ 285 Real Estate Loans Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses for loans that are not PCI loans: Nine months ended September 30, 2018 Beginning of the period $ 6,003 $ 19,304 $ 1,179 $ 4,130 $ 1,914 $ 32,530 Charge-offs (419 ) — (62 ) (555 ) (1,134 ) (2,170 ) Recoveries 855 569 3 214 257 1,898 Provision for loan losses (587 ) 3,077 470 1,852 1,525 6,337 Balance at end of period $ 5,852 $ 22,950 $ 1,590 $ 5,641 $ 2,562 $ 38,595 Nine months ended September 30, 2017 Beginning of the period $ 5,640 $ 14,713 $ 883 $ 3,785 $ 1,548 $ 26,569 Charge-offs (250 ) (72 ) — (677 ) (723 ) (1,722 ) Recoveries 816 626 596 254 162 2,454 Provision for loan losses (182 ) 3,357 (344 ) 628 783 4,242 Balance at end of period $ 6,024 $ 18,624 $ 1,135 $ 3,990 $ 1,770 $ 31,543 Real Estate Loans Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses for loans that are PCI loans: Nine months ended September 30, 2018 Beginning of the period $ — $ 59 $ 222 $ — $ 14 $ 295 Charge-offs — — — — — — Recoveries — — — 75 — 75 Provision for loan losses — (59 ) (20 ) (75 ) — (154 ) Balance at end of period $ — $ — $ 202 $ — $ 14 $ 216 Nine months ended September 30, 2017 Beginning of the period $ 54 $ 92 $ 312 $ — $ 14 $ 472 Charge-offs — — — — — — Recoveries — 65 — — — 65 Provision for loan losses (54 ) (99 ) (99 ) — — (252 ) Balance at end of period $ — $ 58 $ 213 $ — $ 14 $ 285 The following tables present the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of September 30, 2018 and December 31, 2017. Accrued interest receivable and unearned loan fees and costs are not included in the recorded investment because they are not material. Real Estate Loans As of September 30, 2018 Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 417 $ 445 $ — $ 546 $ 5 $ 1,413 Collectively evaluated for impairment 5,435 22,505 1,590 5,095 2,557 37,182 Purchased credit impaired — — 202 — 14 216 Total ending allowance balance $ 5,852 $ 22,950 $ 1,792 $ 5,641 $ 2,576 $ 38,811 Loans: Individually evaluated for impairment $ 7,055 $ 7,686 $ 971 $ 1,292 $ 164 $ 17,168 Collectively evaluated for impairment 1,706,038 4,387,665 644,914 1,103,100 194,439 8,036,156 Purchased credit impaired 62,507 92,444 6,955 5,479 286 167,671 Total ending loan balances $ 1,775,600 $ 4,487,795 $ 652,840 $ 1,109,871 $ 194,889 $ 8,220,995 Real Estate Loans As of December 31, 2017 Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 586 $ — $ 4 $ 206 $ 8 $ 804 Collectively evaluated for impairment 5,417 19,304 1,175 3,924 1,906 31,726 Purchased credit impaired — 59 222 — 14 295 Total ending allowance balance $ 6,003 $ 19,363 $ 1,401 $ 4,130 $ 1,928 $ 32,825 Loans: Individually evaluated for impairment $ 8,101 $ 8,218 $ 331 $ 3,497 $ 198 $ 20,345 Collectively evaluated for impairment 1,017,202 2,537,925 235,485 690,004 107,282 4,587,898 Purchased credit impaired 59,975 92,791 6,656 4,444 292 164,158 Total ending loan balance $ 1,085,278 $ 2,638,934 $ 242,472 $ 697,945 $ 107,772 $ 4,772,401 The table below summarizes impaired loan data for the periods presented. Sep. 30, 2018 Dec. 31, 2017 Performing TDRs (these are not included in nonperforming loans ("NPLs")) $ 9,204 $ 12,081 Nonperforming TDRs (these are included in NPLs) 1,284 698 Total TDRs (these are included in impaired loans) 10,488 12,779 Impaired loans that are not TDRs 6,680 7,566 Total impaired loans $ 17,168 $ 20,345 In certain situations it is common to restructure or modify the terms of troubled loans (i.e. troubled debt restructure or “TDRs”). In those circumstances it may be beneficial to restructure the terms of a loan and work with the borrower for the benefit of both parties, versus forcing the property into foreclosure and having to dispose of it in a distressed sale. When the terms of a loan have been modified, usually the monthly payment and/or interest rate is reduced for generally twelve to twenty-four months. Material principal amounts on any loan modifications have not been forgiven to date. TDRs as of September 30, 2018 and December 31, 2017 quantified by loan type classified separately as accrual (performing loans) and non-accrual (non performing loans) are presented in the tables below. As of September 30, 2018 Accruing Non-Accrual Total Real estate loans: Residential $ 6,525 $ 530 $ 7,055 Commercial 1,855 687 2,542 Land, development, construction 81 41 122 Total real estate loans 8,461 1,258 9,719 Commercial 605 — 605 Consumer and other 138 26 164 Total TDRs $ 9,204 $ 1,284 $ 10,488 As of December 31, 2017 Accruing Non-Accrual Total Real estate loans: Residential $ 7,737 $ 364 $ 8,101 Commercial 3,286 306 3,592 Land, development, construction 332 — 332 Total real estate loans 11,355 670 12,025 Commercial 556 — 556 Consumer and other 170 28 198 Total TDRs $ 12,081 $ 698 $ 12,779 Our policy is to return non-accrual TDR loans to accrual status when all the principal and interest amounts contractually due, pursuant to its modified terms, are brought current and future payments are reasonably assured. Our policy also considers the payment history of the borrower, but is not dependent upon a specific number of payments. The Company recorded a provision for loan loss expense of $54 and $82 and partial charge offs of $11 and $32 on the TDR loans described above during the three and nine month periods ending September 30, 2018. The Company recorded a provision Loans are modified to minimize loan losses when we believe the modification will improve the borrower’s financial condition and ability to repay the loan. We typically do not forgive principal. We generally either reduce interest rates or decrease monthly payments for a temporary period of time and those reductions of cash flows are capitalized into the loan balance. We may also extend maturities, convert balloon loans to longer term amortizing loans, or vice versa, or change interest rates between variable and fixed rate. Each borrower and situation is unique and we try to accommodate the borrower and minimize the Company’s potential losses. Approximately 88% of our TDRs are current pursuant to their modified terms, and $1,284, or approximately 12% of our total TDRs are not performing pursuant to their modified terms. There does not appear to be any significant difference in success rates with one type of concession versus another. Loans modified as TDRs during the three and nine month periods ending September 30, 2018 were $616 and $1,838. The Company recorded loan loss provision of $16 and $33 for loans modified during the three and nine month periods ending September 30, 2018. Loans modified as TDRs during the three and nine month periods ending September 30, 2017 were $85 and $784. The Company recorded a loan loss provision of $0 and $8 for loans modified during the three and nine month periods ending September 30, 2017. The following table presents loans by class modified and for which there was a payment default within twelve months following the modification during the periods ending September 30, 2018 and 2017. Period ending Period ending September 30, 2018 September 30, 2017 Number Recorded Number Recorded of loans investment of loans investment Residential 1 $ 191 1 $ 72 Commercial real estate 1 116 2 616 Land, development, construction — — — — Commercial and Industrial — — — — Consumer and other — — — — Total 2 $ 307 3 $ 688 The Company recorded a provision for loan loss expense of $18 and $24 and partial charge offs of $5 and $10 on TDR loans that subsequently defaulted as described above during the three and nine month periods ending September 30, 2018. The Company recorded a provision for loan loss expense of $8 and $24 and partial charge offs of $8 and $24 on TDR loans that subsequently defaulted as described above during the three and nine month period ending September 30, 2017, respectively. The following tables present loans individually evaluated for impairment by class of loans as of September 30, 2018 and December 31, 2017, excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30. The recorded investment is less than the unpaid principal balance due to partial charge-offs. As of September 30, 2018 Unpaid principal balance Recorded investment Allowance for loan losses allocated With no related allowance recorded: Residential real estate $ 4,105 $ 3,977 $ — Commercial real estate 6,634 6,090 — Land, development, construction 1,009 971 — Commercial and industrial 427 416 — Consumer, other 111 111 — With an allowance recorded: Residential real estate 3,235 3,078 417 Commercial real estate 1,600 1,596 445 Land, development, construction — — — Commercial and industrial 880 876 546 Consumer, other 72 53 5 Total $ 18,073 $ 17,168 $ 1,413 As of December 31, 2017 Unpaid principal balance Recorded investment Allowance for loan losses allocated With no related allowance recorded: Residential real estate $ 4,945 $ 4,818 $ — Commercial real estate 8,973 8,218 — Land, development, construction 260 210 — Commercial and industrial 3,374 2,968 — Consumer, other 142 127 — With an allowance recorded: Residential real estate 3,426 3,283 586 Commercial real estate — — — Land, development, construction 140 121 4 Commercial and industrial 531 529 206 Consumer, other 78 71 8 Total $ 21,869 $ 20,345 $ 804 Three months ended September 30, 2018 Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized Real estate loans: Residential $ 7,328 $ 79 $ — Commercial 7,674 25 — Land, development, construction 961 2 — Total real estate loans 15,963 106 — Commercial and industrial 1,596 9 — Consumer and other loans 165 2 — Total $ 17,724 $ 117 $ — Nine months ended September 30, 2018 Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized Real estate loans: Residential $ 15,306 $ 308 $ — Commercial 2,586 25 — Land, development, construction 324 2 — Total real estate loans 18,216 335 — Commercial and industrial 538 9 — Consumer and other loans 56 2 — Total $ 18,810 $ 346 $ — Three months ended September 30, 2017 Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized Real estate loans: Residential $ 7,536 $ 70 $ — Commercial 9,200 35 — Land, development, construction 343 5 — Total real estate loans 17,079 110 — Commercial and industrial 1,859 7 — Consumer and other loans 262 3 — Total $ 19,200 $ 120 $ — Nine months ended September 30, 2017 Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized Real estate loans: Residential $ 7,767 $ 207 $ — Commercial 8,979 104 — Land, development, construction 465 13 — Total real estate loans 17,211 324 — Commercial and industrial 1,702 22 — Consumer and other loans 245 8 — Total $ 19,158 $ 354 $ — Nonperforming loans include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans, excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30. Nonperforming loans were as follows: Sep. 30, 2018 Dec. 31, 2017 Non accrual loans $ 23,450 $ 17,288 Loans past due over 90 days and still accruing interest — — Total non performing loans $ 23,450 $ 17,288 The following table presents the recorded investment in nonaccrual loans and loans past due over 90 days still on accrual by class of loans as of September 30, 2018 and December 31, 2017, excluding purchased credit impaired loans: As of September 30, 2018 Nonaccrual Loans past due over 90 days still accruing Residential real estate $ 9,234 $ — Commercial real estate 9,108 — Land, development, construction 2,441 — Commercial 2,237 — Consumer, other 430 — Total $ 23,450 $ — As of December 31, 2017 Nonaccrual Loans past due over 90 days still accruing Residential real estate $ 7,107 $ — Commercial real estate 6,549 — Land, development, construction 138 — Commercial 3,121 — Consumer, other 373 — Total $ 17,288 $ — The following table presents the aging of the recorded investment in past due loans as of September 30, 2018 and December 31, 2017, excluding purchased credit impaired loans: Accruing Loans Total 30 - 59 days past due 60 - 89 days past due Greater than 90 days past due Total Past Due Loans Not Past Due Nonaccrual Loans As of September 30, 2018 Residential real estate $ 1,713,093 $ 4,011 $ 4,177 $ — $ 8,188 $ 1,695,671 $ 9,234 Commercial real estate 4,395,351 8,556 5,907 — 14,463 4,371,780 9,108 Land/dev/construction 645,885 796 526 — 1,322 642,122 2,441 Commercial 1,104,392 2,327 970 — 3,297 1,098,858 2,237 Consumer 194,603 929 191 — 1,120 193,053 430 $ 8,053,324 $ 16,619 $ 11,771 $ — $ 28,390 $ 8,001,484 $ 23,450 Accruing Loans Total 30 - 59 days past due 60 - 89 days past due Greater than 90 days past due Total Past Due Loans Not Past Due Nonaccrual Loans As of December 31, 2017 Residential real estate $ 1,025,303 $ 3,568 $ 1,821 $ — $ 5,389 $ 1,012,807 $ 7,107 Commercial real estate 2,546,143 1,158 2,272 — 3,430 2,536,164 6,549 Land/dev/construction 235,816 2,807 189 — 2,996 232,682 138 Commercial 693,501 568 763 — 1,331 689,049 3,121 Consumer 107,480 471 48 — 519 106,588 373 $ 4,608,243 $ 8,572 $ 5,093 $ — $ 13,665 $ 4,577,290 $ 17,288 Credit Quality Indicators: The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans as to credit risk. This analysis is performed on at least an annual basis. The Company uses the following definitions for risk ratings: Special Mention: Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date. Substandard: Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Doubtful: Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered to be pass rated loans. The following table presents the risk category of loans by class of loans based on the most recent analysis performed, excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30, as of September 30, 2018 and December 31, 2017. The increase in loans categorized as special mention and substandard between the periods presented is due to the acquisitions of Sunshine and Harbor on January 1, 2018 and Charter on September 1, 2018. As of September 30, 2018 Loan Category Pass Special Mention Substandard Doubtful Residential real estate $ 1,639,770 $ 46,373 $ 26,950 $ — Commercial real estate 4,181,026 167,606 46,719 — Land/dev/construction 604,023 36,933 4,929 — Commercial 1,076,627 23,896 3,869 — Consumer 193,671 263 669 — Total $ 7,695,117 $ 275,071 $ 83,136 $ — As of December 31, 2017 Loan Category Pass Special Mention Substandard Doubtful Residential real estate $ 987,472 $ 20,435 $ 17,396 $ — Commercial real estate 2,411,085 115,942 19,116 — Land/dev/construction 217,555 17,699 562 — Commercial 674,764 14,186 4,551 — Consumer 106,735 139 606 — Total $ 4,397,611 $ 168,401 $ 42,231 $ — The Company considers the performance of the loan portfolio and its impact on the allowance for loan losses. For residential and consumer loan classes, the Company also evaluates credit quality based on the aging status of the loan, which was previously presented, and by payment activity. The following table presents the recorded investment in residential and consumer loans, excluding purchased credit impaired loans, based on payment activity as of September 30, 2018 and December 31, 2017: As of September 30, 2018 Residential Consumer Performing $ 1,703,859 $ 194,173 Nonperforming 9,234 430 Total $ 1,713,093 $ 194,603 As of December 31, 2017 Residential Consumer Performing $ 1,018,196 $ 107,107 Nonperforming 7,107 373 Total $ 1,025,303 $ 107,480 Purchased Credit Impaired (“PCI”) loans: Income is recognized on PCI loans pursuant to ASC Topic 310-30. A portion of the fair value discount has been ascribed as an accretable yield that is accreted into interest income over the estimated remaining life of the loans. The remaining non-accretable difference represents cash flows not expected to be collected. The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans as of September 30, 2018 and December 31, 2017. Contractually required principal and interest payments have been adjusted for estimated prepayments. Sep. 30, 2018 Dec. 31, 2017 Contractually required principal and interest $ 294,278 $ 248,283 Non-accretable difference (59,433 ) (13,183 ) Cash flows expected to be collected 234,845 235,100 Accretable yield (67,174 ) (70,942 ) Carrying value of acquired loans 167,671 164,158 Allowance for loan losses (216 ) (295 ) Carrying value less allowance for loan losses $ 167,455 $ 163,863 The Company adjusted its estimates of future expected losses, cash flows and renewal assumptions during the current quarter. These adjustments resulted in an increase in expected cash flows and accretable yield, and a decrease in the non-accretable difference. The Company reclassified $4,529, $2,286, $8,443 and $8,364 from non-accretable difference to accretable yield during the three and nine month periods ending September 30, 2018 and 2017 to reflect its adjusted estimates of future expected cash flows. The table below summarizes the changes in total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans during the three and nine month periods ending September 30, 2018 and 2017. Activity during the Effect of income all other three month period ending September 30, 2018 Jun. 30, 2018 acquisitions accretion adjustments Sep. 30, 2018 Contractually required principal and interest $ 285,576 $ 33,687 $ — $ (24,985 ) $ 294,278 Non-accretable difference (44,166 ) (20,763 ) — 5,496 (59,433 ) Cash flows expected to be collected 241,410 12,924 — (19,489 ) 234,845 Accretable yield (67,460 ) (1,492 ) 7,682 (5,904 ) (67,174 ) Carry value of acquired loans $ 173,950 $ 11,432 $ 7,682 $ (25,393 ) $ 167,671 Activity during the Effect of income all other nine month period ending September 30, 2018 Dec. 31, 2017 acquisitions accretion adjustments Sep. 30, 2018 Contractually required principal and interest $ 248,283 $ 122,392 $ — $ (76,397 ) $ 294,278 Non-accretable difference (13,183 ) (58,927 ) — 12,677 (59,433 ) Cash flows expected to be collected 235,100 63,465 — (63,720 ) 234,845 Accretable yield (70,942 ) (7,770 ) 26,496 (14,958 ) (67,174 ) Carry value of acquired loans $ 164,158 $ 55,695 $ 26,496 $ (78,678 ) $ 167,671 Activity during the Effect of income all other three month period ending September 30, 2017 Jun. 30, 2017 acquisitions accretion adjustments Sep. 30, 2018 Contractually required principal and interest $ 280,114 $ — $ — $ (21,776 ) $ 258,338 Non-accretable difference (14,047 ) — — 1,148 (12,899 ) Cash flows expected to be collected 266,067 — — (20,628 ) 245,439 Accretable yield (86,703 ) — 7,696 (2,457 ) (81,464 ) Carry value of acquired loans $ 179,364 $ — $ 7,696 $ (23,085 ) $ 163,975 Activity during the Effect of income all other nine month period ending September 30, 2017 Dec. 31, 2016 acquisitions accretion adjustments Sep. 30, 2018 Contractually required principal and interest $ 297,821 $ 20,729 $ — $ (60,212 ) $ 258,338 Non-accretable difference (18,372 ) (6,347 ) — 11,820 (12,899 ) Cash flows expected to be collected 279,449 14,382 — (48,392 ) 245,439 Accretable yield (93,525 ) (3,266 ) 24,780 (9,453 ) (81,464 ) Carry value of acquired loans $ 185,924 $ 11,116 $ 24,780 $ (57,845 ) $ 163,975

Loans Held for Sale

Loans Held for Sale	9 Months Ended
	Sep. 30, 2018
Loans Receivable Held For Sale Net [Abstract]
Loans Held for Sale	NOTE 7: Loans Held for Sale For periods prior to December 31, 2017, mortgage loans held for sale were valued at the lower of cost or fair value. Effective January 1, 2018, the Company elected to account for these loans under the fair value option with changes in fair value recognized in current period earnings. At the date of funding of the loan, the funded amount of the loan, the relative derivative asset or liability of the associated interest rate lock commitment, less direct costs, becomes the initial recorded investment in the loan held for sale. Such amount approximates the fair value of the loan. This change was accounted for on a prospective basis. Net gains from changes in estimated fair value of mortgage loans held for sale were $723 at September 30, 2018. No loans held for sale at September 30, 2018 were past due or on nonaccrual. The table below summarizes the activity in mortgage loans held for sale during the three month periods ending September 30, 2018 and 2017. Three month periods ended Nine month periods ended Sep. 30, 2018 Sep. 30, 2017 Sep. 30, 2018 Sep. 30, 2017 Beginning balance $ 36,366 $ 8,959 $ 19,647 $ 2,285 Effect from acquisitions 2,835 — 8,959 — Loans originated 91,910 23,444 242,226 53,806 Proceeds from sales (94,226 ) (20,564 ) (238,613 ) (44,780 ) Change in fair value 1 — 723 — Net realized gain on sales 2,668 404 6,612 932 Ending balance $ 39,554 $ 12,243 $ 39,554 $ 12,243 As loans are closed, they are typically sold at prices specified in the forward contracts. Gains or losses may arise if the yields of the loans delivered vary from those specified in the forward contracts. Derivative mortgage loan commitments, or interest rate locks, are also utilized and relate to the origination of a mortgage that will be held for sale upon funding. The Company uses these derivative financial instruments on its loans held for sale to manage interest rate risk and not for speculative purposes. The table below summarizes the notional amounts for interest rate lock commitments, best efforts forward trades and MBS forward trades pertaining to loans held for sale at September 30, 2018. Notional Interest rate lock commitments $ 75,811 Best efforts forward trades 66,425 MBS forward trades 27,000 Total derivative instruments $ 169,236 Mortgage banking derivatives used in the ordinary course of business consist of forward sales contracts and interest rate lock commitments on residential mortgage loans. Forward sales contracts represent future commitments to deliver loans at a specified price and by a specified date and are used to manage interest rate risk on loan commitments and mortgage loans held for sale. Rate lock commitments represent commitments to fund loans at a specific rate and by a specified expiration date. These derivatives involve underlying items, such as interest rates, and are designed to mitigate risk. Notional amounts are amounts on which calculations and payments are based, but which do not represent credit exposure, as credit exposure is limited to the amounts required to be received or paid.

Securities Sold Under Agreement

Securities Sold Under Agreement to Repurchase	9 Months Ended
	Sep. 30, 2018
Banking And Thrift [Abstract]
Securities Sold Under Agreement to Repurchase	NOTE 8: Securities sold under agreement to repurchase Our Bank enters into borrowing arrangements with our retail business customers by agreements to repurchase (“securities sold under agreements to repurchase”) under which the bank pledges investment securities owned and under its control as collateral against these one-day borrowing arrangement. These short-term borrowings totaled $ at September 30, 2018 MBS Municipal As of September 30, 2018 Securities Securities Total Market value of securities pledged $ 66,849 $ 434 $ 67,283 Borrowings related to pledged amounts 51,195 116 51,311 Market value pledged as a % of borrowings 131 % 374 % 131 % As of December 31, 2017 Market value of securities pledged $ 59,239 $ 443 $ 59,682 Borrowings related to pledged amounts 52,030 50 52,080 Market value pledged as a % of borrowings 114 % 886 % 115 % Any risk related to these arrangements, primarily market value changes, are minimized due to the overnight (one day) maturity and the additional collateral pledged over the borrowed amounts.

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Business Combinations	NOTE 9: Business Combinations Acquisition of Platinum Bank Holding Company On April 1, 2017, the Company completed its acquisition of Platinum whereby Platinum merged with and into the Company. Pursuant to and simultaneously with the merger of Platinum with and into the Company, Platinum’s wholly owned subsidiary bank, Platinum Bank, merged with and into the Company’s subsidiary bank, CenterState Bank, N.A. The Company’s primary reasons for the transaction were to further solidify its market share in the Central Florida markets and expand its customer base to enhance deposit fee income and leverage operating cost through economies of scale. The acquisition increased the Company’s total assets and total deposits by approximately 14% and 13%, respectively, as compared with the balances at December 31, 2016, and is expected to positively affect the Company’s operating results to the extent the Company earns more from interest earning assets than it pays in interest on its interest bearing liabilities. During the three and nine month periods ending September 30, 2018 and 2017, respectively, the Company incurred approximately $0, $0, $0 and $3,927 of acquisition costs related to this transaction. These acquisition costs are reported in merger and acquisition related expenses on the Company’s Condensed Consolidated Statements of Income and Comprehensive Income. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations The Company acquired 100% of the outstanding common stock of Platinum. The purchase price consisted of both cash and stock. Each share of Platinum common stock was exchanged for $7.60 cash and 3.7832 shares of the Company’s common stock. Based on the closing price of the Company’s common stock on March 31, 2017, the resulting purchase price was $119,431. The table below summarizes the purchase price calculation. Number of shares of Platinum common stock outstanding at March 31, 2017 1,131,134 Per share exchange ratio 3.7832 Number of shares of CenterState common stock less 51 of fractional shares 4,279,255 Multiplied by CenterState common stock price per share on March 31, 2017 $ 25.90 Fair value of CenterState common stock issued $ 110,833 Total Platinum common shares 1,131,134 Multiplied by the cash consideration each Platinum share is entitled to receive $ 7.60 Total cash consideration, not including cash for fractional shares $ 8,597 Total stock consideration $ 110,833 Total cash consideration plus $1 for 51 of fractional shares $ 8,598 Total purchase price $ 119,431 The list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the April 1, 2017 purchase date. April 1, 2017 Assets: Cash and cash equivalents $ 106,537 Loans, held for investment 442,366 Purchased credit impaired loans 12,218 Investments 28,873 Accrued interest receivable 1,216 Branch real estate 9,600 Furniture and fixtures 402 Bank property held for sale 4,382 FHLB stock 2,220 Other repossessed real estate owned 272 Core deposit intangible 3,992 Goodwill 73,829 Deferred tax asset 227 Other assets 29 Total assets acquired $ 686,163 Liabilities: Deposits $ 520,423 Federal Home Loan Bank advances 40,546 Securities sold under agreement to repurchase 5,569 Accrued interest payable 94 Other liabilities 100 Total liabilities assumed $ 566,732 In the acquisition, the Company acquired $454,584 of loans at fair value, net of $8,980, or 1.9%, estimated discount to the outstanding principal balance, representing 13.3% of the Company’s total loans at December 31, 2016. Of the total loans acquired, management identified $12,218 with credit deficiencies. All loans that were on non-accrual status, impaired loans including TDRs and other substandard loans were considered by management to be credit impaired and are accounted for pursuant to ASC Topic 310-30. The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of April 1, 2017 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 18,811 Non-accretable difference (4,639 ) Cash flows expected to be collected 14,172 Accretable yield (1,954 ) Total purchased credit-impaired loans acquired $ 12,218 The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 37,206 $ 37,419 Commercial real estate 262,612 259,727 Construction/development/land 47,675 46,618 Commercial loans 96,587 95,701 Consumer and other loans 2,954 2,901 Purchased credit-impaired 16,530 12,218 Total earning assets $ 463,564 $ 454,584 In its assumption of the deposit liabilities, the Company believed the deposits assumed from the acquisition have an intangible value. The Company applied ASC Topic 805, which prescribes the accounting for goodwill and other intangible assets such as core deposit intangibles, in a business combination. The Company determined the estimated fair value of the core deposit intangible asset totaled $3,992, Acquisition of Gateway Financial Holdings of Florida, Inc. On May 1, 2017, the Company completed its acquisition of Gateway whereby Gateway merged with and into the Company. Pursuant to and simultaneously with the merger of Gateway with and into the Company, Gateway’s three subsidiary banks, Gateway Bank of Florida, Gateway Bank of Central Florida and Gateway Bank of Southwest Florida, merged with and into the Company’s subsidiary bank, CenterState Bank, N.A. The Company’s primary reasons for the transaction were to expand its market share in the Central Florida market, together with its acquisition of Platinum as described above, and expand its customer base to enhance deposit fee income and leverage operating cost through economies of scale. The acquisition increased the Company’s total assets and total deposits by approximately 19% and 17%, respectively, as compared with the balances at December 31, 2016, and is expected to positively affect the Company’s operating results to the extent the Company earns more from interest earning assets than it pays in interest on its interest bearing liabilities. During the three and nine month periods ending September 30, 2018 and 2017, respectively, the Company incurred approximately $0, The acquisition was accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations The Company acquired 100% of the outstanding common stock of Gateway. The purchase price consisted of both cash and stock. Each share of Gateway common stock was either exchanged for $18.00 cash or 0.95 shares of the Company’s common stock. In addition, the Company assumed Gateway’s stock options, which were converted to the Company’s stock options. Based on the closing price of the Company’s common stock on April 30, 2017, the resulting purchase price was $157,372. The table below summarizes the purchase price calculation. Number of shares of Gateway common stock outstanding at April 30, 2017 5,463,764 Gateway preferred shares that converted to Gateway common shares upon a change in control 919,236 Total Gateway common shares including conversion of preferred shares 6,383,000 Number of shares of Gateway common shares exchanged for CenterState common stock 4,468,100 Per share exchange ratio 0.95 Number of shares of CenterState common stock less 254 of fractional shares 4,244,441 Multiplied by CenterState common stock price per share on April 30, 2017 $ 25.23 Fair value of CenterState common stock issued $ 107,087 Number of shares of Gateway common shares exchanged for cash 1,914,900 Multiplied by the cash consideration each Gateway share is entitled to receive $ 18.00 Total cash consideration, not including cash for fractional shares $ 34,468 Total stock consideration $ 107,087 Total cash consideration plus $6 for 254 of fractional shares $ 34,474 Total consideration paid to Gateway common shareholders $ 141,561 Fair value of Gateway stock options converted to CenterState stock options $ 15,811 Total purchase price $ 157,372 The list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the May 1, 2017 purchase date. May 1, 2017 Assets: Cash and cash equivalents $ 23,065 Loans, held for investment 560,413 Purchased credit impaired loans 7,827 Investments 231,951 Accrued interest receivable 2,422 Branch real estate 18,160 Furniture and fixtures 702 Bank property held for sale 1,087 Federal Reserve Bank and Federal Home Loan Bank stock 4,640 Other repossessed real estate owned 134 Bank owned life insurance 15,475 Servicing asset 271 Core deposit intangible 8,432 Goodwill 77,826 Deferred tax asset 7,246 Other assets 1,217 Total assets acquired $ 960,868 Liabilities: Deposits $ 708,209 Federal Home Loan Bank advances 90,598 Federal funds purchased 3,588 Accrued interest payable 304 Other liabilities 797 Total liabilities assumed $ 803,496 In the acquisition, the Company acquired $568,240 of loans at fair value, net of $9,479, or 1.6%, estimated discount to the outstanding principal balance, representing 16.6% of the Company’s total loans at December 31, 2016. Of the total loans acquired, management identified $7,827 with credit deficiencies. All loans that were on non-accrual status, impaired loans including TDRs and other substandard loans were considered by management to be credit impaired and are accounted for pursuant to ASC Topic 310-30. The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of May 1, 2017 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 12,523 Non-accretable difference (2,465 ) Cash flows expected to be collected 10,058 Accretable yield (2,231 ) Total purchased credit-impaired loans acquired $ 7,827 The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 142,881 $ 142,468 Commercial real estate 321,262 317,578 Construction/development/land 47,727 46,489 Commercial loans 46,953 46,274 Consumer and other loans 7,803 7,604 Purchased credit-impaired 11,093 7,827 Total earning assets $ 577,719 $ 568,240 In its assumption of the deposit liabilities, the Company believed the deposits assumed from the acquisition have an intangible value. The Company applied ASC Topic 805, which prescribes the accounting for goodwill and other intangible assets such as core deposit intangibles, in a business combination. The Company determined the estimated fair value of the core deposit intangible asset totaled $8,432, which will be amortized utilizing an accelerated amortization method over an estimated economic life not to exceed ten years. In determining the valuation amount, deposits were analyzed based on factors such as type of deposit, deposit retention, interest rates and age of deposit relationships. Acquisition of Sunshine Bancorp, Inc. On January 1, 2018, the Company completed its acquisition of Sunshine Bancorp, Inc. (“Sunshine”) whereby Sunshine merged with and into the Company. Pursuant to and simultaneously with the merger of Sunshine with and into the Company, Sunshine’s wholly owned subsidiary bank, Sunshine Bank merged with and into the Company’s subsidiary bank, CenterState Bank, N.A. The Company’s primary reasons for the transaction were to further solidify its market share in the Florida market and expand its customer base to enhance deposit fee income and leverage operating cost through economies of scale. The acquisition increased the Company’s total assets and total deposits by approximately 14% and 13%, respectively, as compared with the balances at December 31, 2017, and is expected to positively affect the Company’s operating results to the extent the Company earns more from interest earning assets than it pays in interest on its interest bearing liabilities. During the three and nine month periods ending September 30, 2018, the Company incurred approximately $0 and $10,474 of acquisition costs related to this transaction. A portion of these merger expenses reduced goodwill by $4,114, net of income taxes of $1,397. These acquisition costs are reported in merger and acquisition related expenses on the Company’s Condensed Consolidated Statements of Income and Comprehensive Income. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations The Company acquired 100% of the outstanding common stock of Sunshine. The purchase price consisted of stock plus cash in lieu of fractional shares. Each share of Sunshine common stock was exchanged for 0.89 shares of the Company’s common stock. Based on the closing price of the Company’s common stock on December 29, 2017, the resulting purchase price was $187,852. The table below summarizes the purchase price calculation. Number of shares of Sunshine common stock outstanding at December 31, 2017 7,922,479 Per share exchange ratio 0.89 Number of shares of CenterState common stock less 361 of fractional shares 7,050,645 CenterState common stock price per share on December 29, 2017 $ 25.73 Fair value of CenterState common stock issued $ 181,413 Cash consideration paid for 361 of fractional shares 7 Total consideration to be paid to Sunshine common shareholders $ 181,420 Fair value of Sunshine stock options converted to CenterState stock options 6,432 Total Purchase Price for Sunshine $ 187,852 The list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the January 1, 2018 purchase date. January 1, 2018 Assets: Cash and cash equivalents $ 47,056 Loans, held for investment 676,090 Purchased credit impaired loans 8,232 Loans held for sale 430 Investments 93,006 Accrued interest receivable 2,170 Branch real estate 9,375 Furniture and fixtures 916 Bank property held for sale 9,503 FHLB stock 4,875 Bank owned life insurance 23,101 Core deposit intangible 8,525 Goodwill 114,228 Deferred tax asset 11,670 Other assets 6,135 Total assets acquired $ 1,015,312 Liabilities: Deposits $ 719,039 Federal Home Loan Bank advances 95,001 Securities sold under agreement to repurchase 353 Subordinated notes 11,000 Accrued interest payable 457 Other liabilities 1,610 Total liabilities assumed $ 827,460 In the acquisition, the Company acquired $684,322 of loans at fair value, net of $22,657, or 3.2%, estimated discount to the outstanding principal balance, representing 14.3% of the Company’s total loans at December 31, 2017. Of the total loans acquired, management identified $8,232 with credit deficiencies. All loans that were on non-accrual status, impaired loans including TDRs and other substandard loans were considered by management to be credit impaired and are accounted for pursuant to ASC Topic 310-30. The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of January 1, 2018 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 21,598 Non-accretable difference (12,213 ) Cash flows expected to be collected 9,385 Accretable yield (1,153 ) Total purchased credit-impaired loans acquired $ 8,232 The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 148,342 $ 146,057 Commercial real estate 375,377 371,323 Construction/development/land 58,530 57,331 Commercial loans 104,811 99,650 Consumer and other loans 1,770 1,729 Purchased credit-impaired 18,149 8,232 Total earning assets $ 706,979 $ 684,322 In its assumption of the deposit liabilities, the Company believed the deposits assumed from the acquisition have an intangible value. The Company applied ASC Topic 805, which prescribes the accounting for goodwill and other intangible assets such as core deposit intangibles, in a business combination. The Company determined the estimated fair value of the core deposit intangible asset totaled $8,525, Acquisition of HCBF Holding Company, Inc. On January 1, 2018, the Company completed its acquisition of HCBF Holding Company, Inc. (“Harbor”) whereby Harbor merged with and into the Company. Pursuant to and simultaneously with the merger of Harbor with and into the Company, Harbor’s wholly owned subsidiary bank, Harbor Bank merged with and into the Company’s subsidiary bank, CenterState Bank, N.A. The Company’s primary reasons for the transaction were to further solidify its market share in the Florida market and expand its customer base to enhance deposit fee income and leverage operating cost through economies of scale. The acquisition increased the Company’s total assets and total deposits by approximately 33% and 32%, respectively, as compared with the balances at December 31, 2017, and is expected to positively affect the Company’s operating results to the extent the Company earns more from interest earning assets than it pays in interest on its interest bearing liabilities. During the three and nine month periods ending September 30, 2018 and 2017, the Company incurred approximately $0 and $11,527 of acquisition costs related to this transaction. These acquisition costs are reported in merger and acquisition related expenses on the Company’s Consolidated Statements of Income and Comprehensive Income. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations The Company acquired 100% of the outstanding common stock of Harbor. The purchase price consisted of both cash and stock. Each share of Harbor common stock was exchanged for $1.925 cash and 0.675 shares of the Company’s common stock. Based on the closing price of the Company’s common stock on December 29, 2017, the resulting purchase price was $448,236. The table below summarizes the purchase price calculation. Number of shares of Harbor common stock outstanding at December 31, 2017 22,299,082 Per share exchange ratio 0.675 Number of shares of CenterState common stock less 241 of fractional shares 15,051,639 CenterState common stock price per share on December 29, 2017 $ 25.73 Fair value of CenterState common stock issued $ 387,279 Number of shares of Harbor common stock outstanding at December 31, 2017 22,299,082 Cash consideration each Harbor share is entitled to receive $ 1.925 Total Cash Consideration plus $6 for 241 of fractional shares $ 42,932 Total Stock Consideration $ 387,279 Total Cash Consideration 42,932 Total consideration to be paid to Harbor common shareholders $ 430,211 Fair value of Harbor stock options converted to CenterState stock options $ 18,025 Total Purchase Price for Harbor $ 448,236 The list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the January 1, 2018 purchase date. January 1, 2018 Assets: Cash and cash equivalents $ 77,176 Loans, held for investment 1,290,004 Purchased credit impaired loans 36,031 Loans held for sale 5,694 Investments 585,297 Accrued interest receivable 5,847 Branch real estate 34,035 Furniture and fixtures 3,571 Bank property held for sale 14,140 FHLB and other stock 9,488 Bank owned life insurance 39,089 Other real estate owned 5,144 Core deposit intangible 23,625 Goodwill 233,321 Deferred tax asset 14,071 Other assets 2,536 Total assets acquired $ 2,379,069 Liabilities: Deposits $ 1,755,155 Federal Home Loan Bank advances 157,919 Corporate debentures 5,872 Accrued interest payable 478 Other liabilities 11,409 Total liabilities assumed $ 1,930,833 In the acquisition, the Company acquired $1,326,035 of loans at fair value, net of $40,438, or 3.0%, estimated discount to the outstanding principal balance, representing 27.8% of the Company’s total loans at December 31, 2017. Of the total loans acquired, management identified $36,031 with credit deficiencies. All loans that were on non-accrual status, impaired loans including TDRs and other substandard loans were considered by management to be credit impaired and are accounted for pursuant to ASC Topic 310-30. The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of January 1, 2018 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 67,107 Non-accretable difference (25,951 ) Cash flows expected to be collected 41,156 Accretable yield (5,125 ) Total purchased credit-impaired loans acquired $ 36,031 The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 370,611 $ 363,559 Commercial real estate 636,517 627,900 Construction/development/land 149,547 146,639 Commercial loans 113,818 110,630 Consumer and other loans 41,660 41,276 Purchased credit-impaired 54,320 36,031 Total earning assets $ 1,366,473 $ 1,326,035 In its assumption of the deposit liabilities, the Company believed the deposits assumed from the acquisition have an intangible value. The Company applied ASC Topic 805, which prescribes the accounting for goodwill and other intangible assets such as core deposit intangibles, in a business combination. The Company determined the estimated fair value of the core deposit intangible asset totaled $23,625, Acquisition of Charter Financial Corporation On September 1, 2018, the Company completed its acquisition of Charter Financial Corporation (“Charter”) whereby Charter merged with and into the Company. Pursuant to and simultaneously with the merger of Charter with and into the Company, Charter’s wholly owned subsidiary bank, CharterBank, merged with and into the Company’s subsidiary bank, CenterState Bank, N.A. The Company’s primary reasons for the transaction were to expand its franchise into Georgia and Alabama, further solidify its market share in the Florida market and expand its customer base to enhance deposit fee income and leverage operating cost through economies of scale. The acquisition increased the Company’s total assets and total deposits by approximately 24% as compared with the balances at December 31, 2017, and is expected to positively affect the Company’s operating results to the extent the Company earns more from interest earning assets than it pays in interest on its interest bearing liabilities. During the three and nine month periods ending September 30, 2018, the Company incurred approximately $10,395 and $10,630 of acquisition costs related to this transaction. These acquisition costs are reported in merger and acquisition related expenses on the Company’s Consolidated Statements of Income and Comprehensive Income. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations The Company acquired 100% of the outstanding common stock of Charter. The purchase price consisted of both cash and stock. Each share of Charter common stock was exchanged for $2.30 cash and 0.738 shares of the Company’s common stock. Based on the closing price of the Company’s common stock on August 31, 2018, the resulting purchase price was $389,476. The table below summarizes the purchase price calculation. Number of shares of Charter common stock outstanding at August 31, 2018 15,480,776 Per share exchange ratio 0.738 Number of shares of CenterState common stock less 599 of fractional shares 11,424,214 CenterState common stock price per share on August 31, 2018 $ 30.62 Fair value of CenterState common stock issued $ 349,809 Number of shares of Charter common stock outstanding at August 31, 2018 15,480,776 Cash consideration each Charter share is entitled to receive $ 2.300 Total Cash Consideration plus $17 for 599 of fractional shares $ 35,624 Total Stock Consideration $ 349,809 Total Cash Consideration 35,624 Total consideration to be paid to Charter common shareholders $ 385,433 Cash out of Charter stock options 4,043 Total Purchase Price for Charter $ 389,476 The list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the September 1, 2018 purchase date. September 1, 2018 Assets: Cash and cash equivalents $ 184,020 Loans, held for investment 1,130,240 Purchased credit impaired loans 11,432 Loans held for sale 2,835 Investments 73,808 Accrued interest receivable 3,684 Branch real estate 27,930 Furniture and fixtures 1,988 Bank property held for sale 1,695 FHLB and other stock 1,483 Bank owned life insurance 54,813 Other real estate owned 257 Core deposit intangible 19,795 Goodwill 197,648 Deferred tax asset 1,966 Other assets 20,947 Total assets acquired $ 1,734,541 Liabilities: Deposits $ 1,321,970 Corporate debentures 9,000 Accrued interest payable 1,015 Other liabilities 13,080 Total liabilities assumed $ 1,345,065 In the acquisition, the Company acquired $1,141,672 of loans at fair value, net of $23,118, or 2.0%, estimated discount to the outstanding principal balance, representing 23.9% of the Company’s total loans at December 31, 2017. Of the total loans acquired, management identified $11,432 with credit deficiencies. All loans that were on non-accrual status, impaired loans including TDRs and some substandard loans were considered by management to be credit impaired and are accounted for pursuant to ASC Topic 310-30. The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of September 1, 2018 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 33,687 Non-accretable difference (20,763 ) Cash flows expected to be collected 12,924 Accretable yield (1,492 ) Total purchased credit-impaired loans acquired $ 11,432 The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 284,505 $ 280,200 Commercial real estate 567,506 557,730 Construction/development/land 181,128 178,687 Commercial loans 88,308 87,062 Consumer and other loans 26,221 26,561 Purchased credit-impaired 17,122 11,432 Total earning assets $ 1,164,790 $ 1,141,672 In its assumption of the deposit liabilities, the Company believed the deposits assumed from the acquisition have an intangible value. The Company applied ASC Topic 805, which prescribes the accounting for goodwill and other intangible assets such as core deposit intangibles, in a business combination. The Company determined the estimated fair value of the core deposit intangible asset totaled $19,795, Pro-forma information Pro-forma data for the three month period ending September 30, 2017 listed in the table below presents pro-forma information as if the Gateway, Sunshine, Harbor and Charter acquisitions occurred at the beginning of 2017. Pro-forma data for the nine month period ending September 30, 2017 listed in the table below presents pro-forma information as if the Platinum, Gateway, Sunshine, Harbor and Charter acquisitions occurred at the beginning of 2017. Pro-forma data for the three and nine month periods ending September 30, 2018 listed in the table below presents pro-forma information as if the Charter acquisition occurred at the beginning of 2017. Three months ended September 30, Nine months ended September 30, 2018 2017 2018 2017 Net interest income $ 112,182 $ 109,779 $ 339,786 $ 315,211 Net income available to common shareholders $ 51,250 $ 32,011 $ 131,102 $ 89,823 EPS - basic $ 0.54 $ 0.34 $ 1.38 $ 0.96 EPS - diluted $ 0.53 $ 0.33 $ 1.36 $ 0.94 The disclosures regarding the results of operations for Platinum, Gateway, Sunshine, Harbor and Charter subsequent to their respective acquisition dates are omitted as this information is not practical to obtain. The Company converted Platinum, Gateway and Sunshine’s core systems in the same quarter as their respective acquisition date. Although the Company did not convert Harbor’s core system in the first quarter of 2018 or Charter’s core system in the third quarter of 2018 , the majority of the fixed costs and purchase accounting entries were booked on the Company’s core system making it impractical to determine Harbor or Charter ’s results of operation on a stand-alone basis .

Interest Rate Swap Derivatives

Interest Rate Swap Derivatives	9 Months Ended
	Sep. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Interest Rate Swap Derivatives	NOTE 10: Interest Rate Swap Derivatives The Company enters into interest rate swaps in order to provide commercial loan clients the ability to swap from fixed to variable interest rates. Under these agreements, the Company enters into a fixed-rate loan with a client in addition to a swap agreement. This swap agreement effectively converts the client’s fixed rate loan into a variable rate. The Company then enters into a matching swap agreement with a third party dealer in order to offset its exposure on the customer swap. At September 30, 2018 and December 31, 2017, the notional amount of such arrangements was $5,044,615 Summary information about the interest rate swap derivative instruments is as follows: Sep. 30, 2018 Dec. 31, 2017 Notional amount $ 5,044,615 $ 3,740,430 Weighted average pay rate on interest-rate swaps 3.49 % 3.00 % Weighted average receive rate on interest rate swaps 3.48 % 3.00 % Weighted average maturity (years) 11 11 Fair value of interest rate swap derivatives (asset) $ 87,946 $ 42,480 Fair value of interest rate swap derivatives (liability) $ 88,065 $ 43,259

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2018
Revenue From Contract With Customer [Abstract]
Revenue from Contracts with Customers	NOTE 11: Revenue from Contracts with Customers On January 1, 2018, the Company adopted 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”). ASU 2014-09 implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract and (v) recognize revenue when (or as) the entity satisfies a performance obligation. The There are two reasons ASU 2014-09 did not have an impact to the Company. First, the majority of revenues are interest earned and gain on sales of loans, investment securities and other financial instruments, all of which are unaffected as they are outside the scope of ASU 2014-09. Secondly, the Company’s non-interest income revenue streams such as service charges on deposits, treasury management fees, wealth advisory fees, fixed income sales, and correspondent bank fees, are all within the scope of ASU 2014-09. However, ASC Topic 606 focuses on revenues from contracts earned over time, but all of these in-scope noninterest income revenue streams are governed by agreements that do not have an enforceable, contractual term. Given the cancellable-at-will structure, ASC Topic 606 views these contracts as agreements-at-will without a defined term, the revenues of which are immediately recognized. The revenue recognition timing is identical compared to previous revenue recognition standards. All of the Company’s revenue from contracts with customers in the scope of ASC 606 is recognized within Non-Interest Income. ASU 2014-09 requires disclosure of sufficient information to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. A description of the Company’s revenue streams accounted for under ASC 606 as well as an explanation of why they are not impacted are as follows: Revenues by Operating Segment/Line of Business Service Charges on Deposit Accounts The Company earns fees from its deposit customers for transaction-based, account maintenance, and overdraft services. Transaction-based fees, which include but are not limited to: services such as ATM use fees, stop payment charges, statement rendering, ACH fees, are recognized at the time the transaction is executed as that is the point in time the Company fulfills the customer’s request. Maintenance fees, which relate primarily to monthly maintenance, are earned over the course of a month, representing the period over which the Company satisfies the performance obligation. Overdraft fees are recognized at the point in time that the overdraft occurs. Service charges on deposits are withdrawn from the customer’s account balance. Treasury Management The Company earns fees for Treasury Management products and services which include but are not limited to online cash management, remote deposit capture, positive pay, and lockboxes. Similar to the above service charges on deposit accounts above, these fees are also recognized at either the time the transaction or at the end of the month in the case where service obligations are provided over the course of each month. Even though a customer’s Treasury Management agreement may provide for services over an indefinite period of time, the customer is free to end the agreement at will without penalty. This structure is viewed as an at-will agreement under ASC 606, the revenues of which are recognized immediately. Wealth Management &Advisory The Company has contracted with a third party to provide wealth management and investment brokerage services on behalf of the Company. All fees earned by the Company from Wealth Management and Advisory activities are in the form of a revenue sharing agreement. The Company acts as agent in this agreement, and as such, ASC 606 deems the third party to be the customer of the Company as opposed to those individual and entities receiving the wealth advisory services. The agreed-upon portion of revenues generated by the third party for services provided other entities and individuals are owed and remitted to the Company at the end of each month, at which time all performance obligations of the Company are fulfilled. Correspondent Banking The company earns revenues from a variety of services to other financial institutions including but not limited to correspondent banking, cash and clearing, safekeeping, wire transfers, international services, bond accounting, and others. Fixed income sales are discussed separately. While there is a significant variety of a la carte services, all (except fixed income sales) are either billed as incurred or are subject to monthly billing, at which point the performance obligation have been fulfilled. Even though a Correspondent agreement may provide for services over an indefinite period of time, the customer is free to end the agreement at will without penalty. This structure is viewed as an at-will agreement under ASC 606, the revenues of which are recognized immediately. Fixed Income Sales The company earns commission revenues from the sale of fixed income securities to institutional investors. These revenues are earned and collected at each individual sale, and the sale is the sole performance obligation. There are no minimum orders or future performance obligations or deferred recognition requirements. Trust The Company sold its Trust Department in December 2017. While there would have been ASC Topic 606 revenue recognition timing implications, the sale prior to December 31, 2017 removed these revenues from consideration. Trust revenues are displayed for prior periods only. Prepaid Cards The Company earns revenues from prepaid card interchange fees and maintenance fees. Interchange fees from cardholder transactions represent a portion of the underlying transaction value and are recognized daily, concurrently with the transaction processing services to the cardholder. Similar to fees from deposits accounts, maintenance fees are earned over the performance obligation period, after which all obligations have been fulfilled. Credit Cards The Company earns revenues from a revenue sharing agreement with a third party who provides credit card services for Company customers. Similar to the Wealth Management and Advisory revenue sharing agreement discussed above, the Company is the agent and the third party is the customer. The revenue sharing agreement calculates fees owed to the Company based on interchange and application amounts and levels. These share of fees are remitted to the Company each month, at which time the performance obligation is fulfilled. Debit Card Interchange Income The Company earns interchange fees from debit cardholder transactions through the MasterCard payment network. Interchange fees form cardholder transactions represent a percentage of the underlying transaction value and are recognized daily, concurrently with the transaction processing services provided to the cardholder. Gains/Losses on Sales of OREO The Company records a gain or loss form the sale of OREO when control of the property transfers to the buyer, which generally occurs at the time of an executed deed. There are no ASC 606 implications unless the Company finances the sale of OREO. There are no instances of the Company financing the sale of one of its OREO properties as of September 30, 2018. Contract Balances The Contract Balances disclosure requirement is not relevant, as no revenues are earned over time that would require the monitoring of contract balances. The Performance Obligations disclosure requirements call for a description of when performance obligations are satisfied, significant payment terms, nature of goods or services promised, and obligations for returns, refunds, and warranties.

Recently Issued Accounting Stan

Recently Issued Accounting Standards	9 Months Ended
	Sep. 30, 2018
Accounting Changes And Error Corrections [Abstract]
Recently Issued Accounting Standards	NOTE 12: Recently Issued Accounting Standards In January 2016, the FASB issued ASU No. 2016-01, "Recognition and Measurement of Financial Assets and Financial Liabilities." This ASU addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments by making targeted improvements to GAAP as follows: (1) require equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. However, an entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer; (2) simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. When a qualitative assessment indicates that impairment exists, an entity is required to measure the investment at fair value; (3) eliminate the requirement to disclose the fair value of financial instruments measured at amortized cost for entities that are not public business entities; (4) eliminate the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; (5) require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (6) require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; (7) require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and (8) clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. ASU No. 2016-01 is effective for interim and annual reporting periods beginning after December 15, 2017. Early application is permitted as of the beginning of the fiscal year of adoption only for provisions (3) and (6) above. Early adoption of the other provisions mentioned above is not permitted. Starting with the first quarter of 2018, the Company began using an exit price notion when measuring the fair value of its loan portfolio, excluding loans held for sale, for disclosure purposes. The new guidance did not impact the Company's Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, "Leases." Under this guidance, lessees will be required to recognize the following for all leases (with the exception of short-term leases): 1) a lease liability, which is the present value of a lessee's obligation to make lease payments, and 2) a right-of-use asset, which is an asset that represents the lessee's right to use, or control the use of, a specified asset for the lease term. Lessor accounting under the new guidance remains largely unchanged as it is substantially equivalent to existing guidance for sales-type leases, direct financing leases, and operating leases. Leveraged leases have been eliminated, although lessors can continue to account for existing leveraged leases using the current accounting guidance. Other limited changes were made to align lessor accounting with the lessee accounting model and the new revenue recognition standard. All entities will classify leases to determine how to recognize lease-related revenue and expense. Quantitative and qualitative disclosures will be required by lessees and lessors to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The intention is to require enough information to supplement the amounts recorded in the financial statements so that users can understand more about the nature of an entity’s leasing activities. ASU No. 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. All entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. Adoption of ASU 2016-02 is not expected to have a material impact on the Company's Consolidated Financial Statements. The Company leases certain properties and equipment under operating leases that will result in the recognition of lease assets and lease liabilities on the Company’s Consolidated Balance Sheet. In March 2016, the FASB issued ASU No. 2016-04, “Liabilities – Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products.” The amendments of this ASU narrowly address breakage, which is the monetary amount of the card that ultimately is not redeemed by the cardholder for prepaid stored-value products that are redeemable for monetary values of goods or services but may also be redeemable for cash. Examples of prepaid stored-value products included in this amendment are prepaid gift cards issued by specific payment networks and redeemable at network-accepting merchant locations, prepaid telecommunication cards, and traveler’s checks. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. The Company adopted ASU 2016-04 during the first quarter of 2018 but there was no material impact to the financial statements as a result of the adoption of the new standard. In June 2016, the FASB issued ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments.” This ASU significantly changes how entities will measure credit losses for most financial assets and certain other instruments that aren’t measured at fair value through net income. In issuing the standard, the FASB is responding to criticism that today’s guidance delays recognition of credit losses. The standard will replace today’s “incurred loss” approach with an “expected loss” model. The new model, referred to as the current expected credit loss (“CECL”) model, will apply to: (1) financial assets subject to credit losses and measured at amortized cost, and (2) certain off-balance sheet credit exposures. This includes, but is not limited to, loans, leases, held-to-maturity securities, loan commitments, and financial guarantees. The CECL model does not apply to available-for-sale (“AFS”) debt securities. For AFS debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. As a result, entities will recognize improvements to estimated credit losses immediately in earnings rather than as interest income over time, as they do today. The ASU also simplifies the accounting model for purchased credit-impaired debt securities and loans. ASU 2016-13 also expands the disclosure requirements regarding an entity’s assumptions, models, and methods for estimating the allowance for loan and lease losses. In addition, entities will need to disclose the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination. ASU No. 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted for interim and annual reporting periods beginning after December 15, 2018. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). The Company formed a CECL committee to assist with the implementation process, selected a vendor to assist with the implementation process, and is currently evaluating the provisions of ASU No. 2016-13 to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements, including different methodologies that may be employed to estimate credit losses as well as additional data gathering that will be needed to adopt the standard. The standard will add new disclosures related to factors that influenced management’s estimate, including current expected credit losses, the changes in those factors, and reasons for the changes as well as the method applied to revert to historical credit loss experience, and the Company expects to recognize a one-time cumulative effect adjustment to the allowance for loan losses as of the beginning of the first reporting period in which the new standard is effective, but has not yet determined the magnitude of any such one-time adjustment or the overall impact on the Company’s Financial Statements. In October 2016, the FASB issued ASU No. 2016-16, “Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory.” Current guidance prohibits the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. This prohibition on recognition is an exception to the principle of comprehensive recognition of current and deferred income taxes in generally accepted accounting principles. The exception has led to diversity in practice and is a source of complexity in financial reporting. FASB decided that an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Consequently, the amendments in this update eliminate the exception for an intra-entity transfer of an asset other than inventory. The amendments in this update do not include new disclosure requirements; however, existing disclosure requirements might be applicable when accounting for the current and deferred income taxes for an intra-entity transfer of an asset other than inventory. For public business entities, the amendments in this update are effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within those annual reporting periods. The amendments in this update should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The new guidance effective January 1, 2018 does not have a material impact on the Consolidated Financial Statements. In January 2017, the FASB issued ASU No. 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business.” The amendments in this update provide a more robust framework to use in determining when a set of assets and activities is a business. Because the current definition of a business is interpreted broadly and can be difficult to apply, stakeholders indicated that analyzing transactions is inefficient and costly and that the definition does not permit the use of reasonable judgment. The amendments provide more consistency in applying the guidance, reduce the costs of application, and make the definition of a business more operable. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. The Company adopted ASU 2017-01 but there was no impact to the financial statements as a result of the adoption of the new standard. In January 2017, the FASB issued ASU No. 2017-04, “Simplifying the Test for Goodwill Impairment,” to simplify how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. In computing the implied fair value of goodwill under Step 2, an entity had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Instead, under the amendments in this update, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. FASB also eliminated the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. Therefore, the same impairment assessment applies to all reporting units. An entity is required to disclose the amount of goodwill allocated to each reporting unit with a zero or negative carrying amount of net assets. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2019. The Company is currently evaluating the impact of adopting the new guidance on the Consolidated Financial Statements, but it is not expected to have a material impact. In May 2017, the FASB issued ASU 2017-09, “Scope of Modification Accounting,” to provide clarity and reduce both (1) diversity in practice and (2) cost and complexity when applying the guidance in Topic 718, “Compensation—Stock Compensation,” to a change to the terms or conditions of a share-based payment award. The amendments in this update provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. An entity should account for the effects of a modification unless all the following are met: (1) the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the modified award is the same as the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the original award immediately before the original award is modified. If the modification does not affect any of the inputs to the valuation technique that the entity uses to value the award, the entity is not required to estimate the value immediately before and after the modification; (2) the vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified; (3) the classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified. The current disclosure requirements in Topic 718 apply regardless of whether an entity is required to apply modification accounting under the amendments in this update. For public business entities, the amendments in this update become effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in an interim period. An entity should apply the amendments in this update prospectively to an award modified on or after the adoption date. The Company adopted the new guidance but it did not have a material impact on the Consolidated Financial Statements. In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” The amendments in this update more closely align the results of cash flow and fair value hedge accounting with risk management activities through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results in the financial statements. The amendments address specific limitations in current GAAP by expanding hedge accounting for both nonfinancial and financial risk components and by refining the measurement of hedge results to better reflect an entity’s hedging strategies. Thus, the amendments will enable an entity to report more faithfully the economic results of hedging activities for certain fair value and cash flow hedges and will avoid mismatches in earnings by allowing for greater precision when measuring changes in fair value of the hedged item for certain fair value hedges. Additionally, by aligning the timing of recognition of hedge results with the earnings effect of the hedged item for cash flow and net investment hedges, and by including the earnings effect of the hedging instrument in the same income statement line item in which the earnings effect of the hedged item is presented, the results of an entity’s hedging program and the cost of executing that program will be more visible to users of financial statements. Overall, those amendments are an improvement because an entity’s financial statements will reflect more accurately and comprehensively the intent and outcome of its hedging strategies. The tabular disclosure related to effects on the income statement of fair value and cash flow hedges and the disclosure of cumulative basis adjustments for fair value hedges provide users with a more complete picture of the effect of hedge accounting on an entity’s income statement and balance sheet. When considered together, the amendments to presentation and disclosures are an improvement because they will provide users with more decision-useful information about the effect of an entity’s risk management activities on the financial statements. Additionally, the amendments in this Update should ease the operational burden of applying hedge accounting by allowing more time to prepare hedge documentation and, allowing effectiveness assessments to be performed on a qualitative basis after hedge inception. For public business entities, the amendments in this update become effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. All transition requirements and elections should be applied to hedging relationships existing (that is, hedging relationships in which the hedging instrument has not expired, been sold, terminated, or exercised or the entity has not removed the designation of the hedging relationship) on the date of adoption. The effect of adoption should be reflected as of the beginning of the fiscal year of adoption (that is, the initial application date). For cash flow and net investment hedges existing at the date of adoption, an entity should apply a cumulative-effect adjustment related to eliminating the separate measurement of ineffectiveness to accumulated other comprehensive income with a corresponding adjustment to the opening balance of retained earnings as of the beginning of the fiscal year that an entity adopts the amendments in this Update. The amended presentation and disclosure guidance is required only prospectively. The Company is currently evaluating the impact of adopting the new guidance on the Consolidated Financial Statements. In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”. On December 22, 2017, the U.S. federal government enacted the Tax Act. Stakeholders in the banking and insurance industries expressed concern about the guidance in current generally accepted accounting principles (GAAP) that requires deferred tax liabilities and assets to be adjusted for the effect of a change in tax laws or rates with the effect included in income from continuing operations in the reporting period that includes the enactment date. That guidance is applicable even in situations in which the related income tax effects of items in accumulated other comprehensive income were originally recognized in other comprehensive income (rather than in income from continuing operations). Those stakeholders asserted that because the adjustment of deferred taxes due to the reduction of the historical corporate income tax rate to the newly enacted corporate income tax rate is required to be included in income from continuing operations, the tax effects of items within accumulated other comprehensive income (referred to as stranded tax effects) do not reflect the appropriate tax rate. The amendments in this update affect any entity that is required to apply the provisions of Topic 220, Income Statement—Reporting Comprehensive Income, and has items of other comprehensive income for which the related tax effects are presented in other comprehensive income as required by GAAP. The amendments in this update allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Act. Consequently, the amendments eliminate the stranded tax effects resulting from the Tax Act and will improve the usefulness of information reported to financial statement users. The amendments only relate to the reclassification of the income tax effects of the Tax Act; the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The amendments in this update also require certain disclosures about stranded tax effects. The amendments in this update are effective for all entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption of the amendments in this update is permitted, including adoption in any interim period, for public business entities for reporting periods for which financial statements have not yet been issued. The amendments in this update should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Act is recognized. The Company early adopted this update which resulted in a reclassification of $1,241 from accumulated other comprehensive income to retained earnings for stranded tax effects for the year ended December 31, 2017. In June 2018, the FASB issued ASU No. 2018-07, “Compensation – Stock Compensation (Topic 718) - Improvements to Nonemployee Share-Based Payment Accounting,” to include share based payment transactions for acquiring goods and services from nonemployees. An entity should apply the requirements of Topic 718 to nonemployee awards except for specific guidance on inputs to an option pricing model and the attribution of cost (that is, the period of time over which share-based payment awards vest and the pattern of cost recognition over that period). The amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. The amendments also clarify that Topic 718 does not apply to share-based payments used to effectively provide (1) financing to the issuer or (2) awards granted in conjunction with selling goods or services to customers as part of a contract accounted for under Topic 606, Revenue from Contracts with Customers. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2018 but no earlier than an entity’s adoption date of Topic 606. The Company is currently evaluating the impact of adopting the new guidance on the Consolidated Financial Statements, but it is not expected to have a material impact. In August 2018, the FASB issued ASU No. 2018-13, “Fair Value Measurement (Topic 820) - Changes to the Disclosure Requirements for Fair Value Measurement,” to modify the disclosure requirements on fair value measurements in Topic 820 based on the concepts in the Concepts Statement, including the consideration of costs and benefits. The following disclosure requirements were removed from Topic 820: (1) the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; (2) the policy for timing of transfers between levels; (3) the valuation processes for Level 3 fair value measurements; and (4) for nonpublic entities, the changes in unrealized gains and losses for the period included in earnings for recurring Level 3 fair value measurements held at the end of the reporting period. The following disclosure requirements were modified in Topic 820: (1) in lieu of a rollforward for Level 3 fair value measurements, a nonpublic entity is required to disclose transfers into and out of Level 3 of the fair value hierarchy and purchases and issues of Level 3 assets and liabilities; (2) for investments in certain entities that calculate net asset value, an entity is required to disclose the timing of liquidation of an investee’s assets and the date when restrictions from redemption might lapse only if the investee has communicated the timing to the entity or announced the timing publicly; and (3) the amendments clarify that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date. T he following disclosure requirements were added to Topic 820 : (1) t he changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period ; ( 2 ) t he range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. For certain unobservable inputs, an entity may disclose other quantitative information (such as the median or arithmetic average) in lieu of the weighted average if the entity determines that other quantitative information would be a more reasonable and rational method to reflect the distribution of unobservable inputs used to develop Level 3 fair value measurements. The amendments in this update are effective for annual periods and interim periods within those annual periods beginning after December 15, 201 9 . The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted upon issuance of this update. An entity is permitted to early adopt any removed or modified disclosures upon issuance of this update and delay adoption of the additional disclosures until their effective date. The Company is currently evaluating the impact of adopting the new guidance on the Consolidated Financial Statements, but it is not expected to have a material impact.

Common Stock Outstanding and _2

Common Stock Outstanding and Earnings Per Share Data (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Factors Used in Earnings Per Share Computations	The following table presents the factors used in the earnings per share computations for the periods indicated. Three months ended September 30, Nine months ended September 30, 2018 2017 2018 2017 Basic Net income available to common shareholders $ 37,985 $ 22,050 $ 105,784 $ 53,883 Less: Earnings allocated to participating securities (28 ) (46 ) (84 ) (121 ) Net income allocated to common shareholders $ 37,957 $ 22,004 $ 105,700 $ 53,762 Weighted average common shares outstanding including participating securities 87,881,806 60,032,804 85,026,929 56,442,506 Less: Participating securities (1) (68,135 ) (126,194 ) (68,652 ) (126,806 ) Average shares 87,813,671 59,906,610 84,958,277 56,315,700 Basic earnings per common share $ 0.43 $ 0.37 $ 1.24 $ 0.95 Diluted Net income available to common shareholders $ 37,957 $ 22,004 $ 105,700 $ 53,762 Weighted average common shares outstanding for basic earnings per common share 87,813,671 59,906,610 84,958,277 56,315,700 Add: Dilutive effects of stock based compensation awards 997,031 1,208,395 1,251,432 1,014,567 Average shares and dilutive potential common shares 88,810,702 61,115,005 86,209,709 57,330,267 Diluted earnings per common share $ 0.43 $ 0.36 $ 1.23 $ 0.94 1. Participating securities are restricted stock awards whereby the stock certificates have been issued, are included in outstanding shares, receive dividends and can be voted, but have not vested.

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis are summarized below. Fair value measurements using Quoted prices Significant in active other Significant markets for observable unobservable Carrying identical assets inputs inputs value (Level 1) (Level 2) (Level 3) at September 30, 2018 Assets: Available for sale securities Corporate debt securities $ 6,361 — $ 6,361 — Obligations of U.S. government sponsored entities and agencies 39,644 — 39,644 — Mortgage backed securities 1,412,459 — 1,412,459 — Municipal securities 78,378 — 78,378 — Loans held for sale, at fair value 39,554 — 39,554 — Mortgage banking derivatives 938 — — 938 Interest rate swap derivatives 87,946 — 87,946 — Liabilities: Mortgage banking derivatives 27 — — 27 Interest rate swap derivatives 88,065 — 88,065 — at December 31, 2017 Assets: Trading securities $ 6,777 — $ 6,777 — Available for sale securities U.S. Treasury securities 5,200 — 5,200 — Obligations of U.S. government sponsored entities and agencies 9,574 — 9,574 — Mortgage backed securities 972,611 — 972,611 — Municipal securities 72,758 — 72,758 — Interest rate swap derivatives 42,480 — 42,480 — Liabilities: Interest rate swap derivatives 43,259 — 43,259 —
Assets and Liabilities Measured at Fair Value on Non-Recurring Basis	Assets and liabilities measured at fair value on a non-recurring basis are summarized below. Fair value measurements using Significant Quoted prices in other Significant active markets for observable unobservable Carrying identical assets inputs inputs value (Level 1) (Level 2) (Level 3) at September 30, 2018 Assets: Impaired loans Residential real estate $ 2,312 — — $ 2,312 Commercial real estate 5,350 — — 5,350 Land, land development and construction 942 — — 942 Commercial 251 — — 251 Consumer 52 — — 52 Other real estate owned Residential real estate 117 117 Commercial real estate 261 — — 261 Land, land development and construction 1,312 — — 1,312 Bank property held for sale 5,805 — — 5,805 at December 31, 2017 Assets: Impaired loans Residential real estate $ 2,423 — — $ 2,423 Commercial real estate 6,293 — — 6,293 Land, land development and construction 292 — — 292 Commercial 2,131 — — 2,131 Consumer 57 — — 57 Other real estate owned Residential real estate 635 — — 635 Commercial real estate 261 — — 261 Land, land development and construction 1,481 — — 1,481 Bank property held for sale 1,516 — — 1,516
Carrying Amounts and Estimated Fair Values of Company's Financial Instruments	The following table presents the carry amounts and estimated fair values of the Company’s financial instruments: Fair value measurements at September 30, 2018 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 606,331 $ 606,331 $ — $ — $ 606,331 Investment securities available for sale 1,536,842 — 1,536,842 — 1,536,842 Investment securities held to maturity 219,850 — 211,262 — 211,262 FHLB, FRB and other stock 70,311 — — — n/a Loans held for sale, at fair value 39,554 — 39,554 — 39,554 Loans, net 8,184,281 — — 8,125,840 8,125,840 Mortgage banking derivatives 938 — — 938 938 Interest rate swap derivatives 87,946 — 87,946 — 87,946 Accrued interest receivable 32,972 — 6,798 26,174 32,972 Financial liabilities: Deposits- without stated maturities $ 7,612,238 $ 7,612,238 $ — $ — $ 7,612,238 Deposits- with stated maturities 1,862,288 — 1,867,827 — 1,867,827 Securities sold under agreement to repurchase 51,311 — 51,311 — 51,311 Federal funds purchased and other borrowings 643,002 — 643,002 — 643,002 Corporate debentures 41,328 — — 37,928 37,928 Mortgage banking derivatives 27 — — 27 27 Interest rate swap derivatives 88,065 — 88,065 — 88,065 Accrued interest payable 2,570 — 2,570 — 2,570 Fair value measurements at December 31, 2017 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 280,619 $ 280,619 $ — $ — $ 280,619 Trading securities 6,777 — 6,777 — 6,777 Investment securities available for sale 1,060,143 — 1,060,143 — 1,060,143 Investment securities held to maturity 232,399 — 231,615 — 231,615 FHLB and FRB stock 34,876 — — — n/a Loans held for sale 19,647 — 19,647 — 19,647 Loans, net 4,740,396 — — 4,731,514 4,731,514 Interest rate swap derivatives 42,480 — 42,480 — 42,480 Accrued interest receivable 18,628 — 5,370 13,258 18,628 Financial liabilities: Deposits- without stated maturities $ 4,727,840 $ 4,727,840 $ — $ — $ 4,727,840 Deposits- with stated maturities 832,683 — 845,039 — 845,039 Securities sold under agreement to repurchase 52,080 — 52,080 — 52,080 Federal funds purchased and other borrowings 506,490 — 506,490 — 506,490 Corporate debentures 26,192 — — 22,363 22,363 Interest rate swap derivatives 43,259 — 43,259 — 43,259 Accrued interest payable 1,169 — 1,169 — 1,169

Reportable Segments (Tables)

Reportable Segments (Tables)	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Reconciliation of Reportable Segment Revenues, Expenses and Profit	The table below is a reconciliation of the reportable segment revenues, expenses, and profit to the Company’s consolidated total for the three and nine month periods ending September 30, 2018 and 2017. Three month period ending September 30, 2018 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 110,764 $ 3,899 $ — $ — $ 114,663 Interest expense (9,992 ) (2,005 ) (813 ) — (12,810 ) Net interest income (expense) 100,772 1,894 (813 ) — 101,853 Provision for loan losses (1,965 ) 15 — — (1,950 ) Non interest income 18,808 8,296 — — 27,104 Non interest expense (70,652 ) (5,678 ) (1,009 ) — (77,339 ) Net income (loss) before taxes 46,963 4,527 (1,822 ) — 49,668 Income tax (provision) benefit (11,086 ) (1,147 ) 550 — (11,683 ) Net income $ 35,877 $ 3,380 $ (1,272 ) $ — $ 37,985 Total assets $ 11,604,329 $ 661,880 $ 1,969,635 $ (1,961,479 ) $ 12,274,365 Nine month period ending September 30, 2018 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 317,851 $ 10,600 $ — $ — $ 328,451 Interest expense (23,689 ) (4,734 ) (2,628 ) — (31,051 ) Net interest income (expense) 294,162 5,866 (2,628 ) — 297,400 Provision for loan losses (6,039 ) (144 ) — — (6,183 ) Non interest income 49,228 23,495 8 — 72,731 Non interest expense (213,934 ) (16,172 ) (2,841 ) — (232,947 ) Net income (loss) before taxes 123,417 13,045 (5,461 ) — 131,001 Income tax (provision) benefit (28,585 ) (3,305 ) 6,673 — (25,217 ) Net income (loss) $ 94,832 $ 9,740 $ 1,212 $ — $ 105,784 Total assets $ 11,604,329 $ 661,880 $ 1,969,635 $ (1,961,479 ) $ 12,274,365 Three month period ending September 30, 2017 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 64,410 $ 2,647 $ — $ — $ 67,057 Interest expense (3,305 ) (819 ) (347 ) — (4,471 ) Net interest income (expense) 61,105 1,828 (347 ) — 62,586 Provision for loan losses (1,113 ) 17 — — (1,096 ) Non interest income 9,528 7,213 — — 16,741 Non interest expense (38,432 ) (5,304 ) (886 ) — (44,622 ) Net income (loss) before taxes 31,088 3,754 (1,233 ) — 33,609 Income tax (provision) benefit (10,579 ) (1,448 ) 468 — (11,559 ) Net income $ 20,509 $ 2,306 $ (765 ) $ — $ 22,050 Total assets $ 6,319,532 $ 498,669 $ 940,571 $ (935,911 ) $ 6,822,861 Nine month period ending September 30, 2017 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 175,015 $ 7,889 $ — $ — $ 182,904 Interest expense (7,934 ) (2,048 ) (998 ) — (10,980 ) Net interest income (expense) 167,081 5,841 (998 ) — 171,924 Provision for loan losses (4,073 ) 83 — — (3,990 ) Non interest income 26,493 21,724 — — 48,217 Non interest expense (119,304 ) (15,594 ) (2,576 ) — (137,474 ) Net income (loss) before taxes 70,197 12,054 (3,574 ) — 78,677 Income tax (provision) benefit (22,900 ) (4,649 ) 2,755 — (24,794 ) Net income (loss) $ 47,297 $ 7,405 $ (819 ) $ — $ 53,883 Total assets $ 6,319,532 $ 498,669 $ 940,571 $ (935,911 ) $ 6,822,861

Investment securities (Tables)

Investment securities (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value of Available for Sale Securities and Related Gross Unrealized Gains and Losses Recognized in Accumulated Other Comprehensive Income (Loss)	The fair value of available for sale securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) were as follows: September 30, 2018 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value Corporate debt securities $ 6,265 $ 96 $ — $ 6,361 Obligations of U.S. government sponsored entities and agencies 40,882 6 1,244 39,644 Mortgage backed securities 1,460,552 54 48,147 1,412,459 Municipal securities 79,375 151 1,148 78,378 Total available-for-sale $ 1,587,074 $ 307 $ 50,539 $ 1,536,842 December 31, 2017 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities $ 5,000 $ 200 $ — $ 5,200 Obligations of U.S. government sponsored entities and agencies 10,000 — 426 9,574 Mortgage backed securities 982,565 752 10,706 972,611 Municipal securities 71,961 863 66 72,758 Total available-for-sale $ 1,069,526 $ 1,815 $ 11,198 $ 1,060,143
Schedule of Sales of Available for Sale Securities	Sales of available for sale securities for the nine months ended September 30, 2018 and 2017 were as follows: For the nine months ended: September 30, 2018 September 30, 2017 Proceeds $ 364,152 $ 260,824 Gross gains 68 — Gross losses 90 —
Fair Value of Held to Maturity Securities and Related Gross Unrecognized Gains and Losses	The following reflects the fair value of held-to-maturity securities and the related gross unrecognized gains and losses as of September 30, 2018 and December 31, 2017. September 30, 2018 Gross Gross Amortized Unrecognized Unrecognized Fair Cost Gains Losses Value Mortgage backed securities $ 87,872 $ — $ 3,627 $ 84,245 Municipal securities 131,978 410 5,371 127,017 Total held-to-maturity $ 219,850 $ 410 $ 8,998 $ 211,262 December 31, 2017 Gross Gross Amortized Unrecognized Unrecognized Fair Cost Gains Losses Value Mortgage backed securities $ 100,039 $ — $ 1,068 $ 98,971 Municipal securities 132,360 1,781 1,497 132,644 Total held to maturity $ 232,399 $ 1,781 $ 2,565 $ 231,615
Available-for-sale Securities [Member]
Fair Value and Amortized Cost of Investment Securities by Contractual Maturity	The fair value of available for sale securities at September 30, 2018 by contractual maturity were as follows. Securities not due at a single maturity date, primarily mortgage-backed securities, are shown separately. Fair Amortized Investment securities available for sale: Value Cost Due one year or less $ 782 $ 781 Due after one year through five years 5,537 5,502 Due after five years through ten years 29,657 30,535 Due after ten years through thirty years 88,407 89,704 Mortgage backed securities 1,412,459 1,460,552 Total available-for-sale $ 1,536,842 $ 1,587,074
Investments Gross Unrealized Losses and Fair Value	The following tables show the Company’s available for sale investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2018 and December 31, 2017. September 30, 2018 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Obligations of U.S. government sponsored entities and agencies $ 27,193 $ 352 $ 9,108 $ 892 $ 36,301 $ 1,244 Mortgage backed securities 1,047,726 29,046 360,105 19,101 1,407,831 48,147 Municipal securities 70,028 1,148 — — 70,028 1,148 Total temporarily impaired available-for-sale securities $ 1,144,947 $ 30,546 $ 369,213 $ 19,993 $ 1,514,160 $ 50,539 December 31, 2017 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Obligations of U.S. government sponsored entities and agencies $ — $ — $ 9,574 $ 426 $ 9,574 $ 426 Mortgage backed securities 477,925 3,298 316,066 7,408 793,991 10,706 Municipal securities 11,698 66 — — 11,698 66 Total temporarily impaired available-for-sale securities $ 489,623 $ 3,364 $ 325,640 $ 7,834 $ 815,263 $ 11,198
Held-to-maturity Securities [Member]
Fair Value and Amortized Cost of Investment Securities by Contractual Maturity	The fair value and amortized cost of held-to-maturity securities at September 30, 2018 by contractual maturity were as follows. Mortgage-backed securities are not due at a single maturity date and are shown separately. Fair Amortized Investment securities held-to-maturity Value Cost Due after five years through ten years $ 2,039 $ 2,048 Due after ten years through thirty years 124,978 129,930 Mortgage backed securities 84,245 87,872 Total held-to-maturity $ 211,262 $ 219,850
Investments Gross Unrealized Losses and Fair Value	The following table shows the Company’s held-to-maturity investments’ gross unrecognized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrecognized loss position, at September 30, 2018 and December 31, 2017. September 30, 2018 Less than 12 months 12 months or more Total Fair Unrecognized Fair Unrecognized Fair Unrecognized Value Losses Value Losses Value Losses Mortgage backed securities $ 22,791 $ 924 $ 61,454 $ 2,703 $ 84,245 $ 3,627 Municipal securities 57,662 1,558 37,428 3,813 95,090 5,371 Total temporarily impaired held-to-maturity securities $ 80,453 $ 2,482 $ 98,882 $ 6,516 $ 179,335 $ 8,998 December 31, 2017 Less than 12 months 12 months or more Total Fair Unrecognized Fair Unrecognized Fair Unrecognized Value Losses Value Losses Value Losses Mortgage backed securities $ 57,266 $ 451 $ 41,705 $ 617 $ 98,971 $ 1,068 Municipal securities 13,350 186 37,963 1,311 51,313 1,497 Total temporarily impaired held-to-maturity securities $ 70,616 $ 637 $ 79,668 $ 1,928 $ 150,284 $ 2,565

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Summary of Information Concerning Loan Portfolio by Collateral Types	The following table sets forth information concerning the loan portfolio by collateral types as of the dates indicated. September 30, 2018 December 31, 2017 Loans excluding PCI loans Real estate loans Residential $ 1,713,093 $ 1,025,303 Commercial 4,395,351 2,546,143 Land, development and construction 645,885 235,816 Total real estate 6,754,329 3,807,262 Commercial 1,104,392 693,501 Consumer and other loans 194,603 107,480 Loans before unearned fees and deferred cost 8,053,324 4,608,243 Net unearned fees and costs 2,097 820 Total loans excluding PCI loans 8,055,421 4,609,063 PCI loans (note 1) Real estate loans Residential 62,507 59,975 Commercial 92,444 92,791 Land, development and construction 6,955 6,656 Total real estate 161,906 159,422 Commercial 5,479 4,444 Consumer and other loans 286 292 Total PCI loans 167,671 164,158 Total loans 8,223,092 4,773,221 Allowance for loan losses for loans that are not PCI loans (38,595 ) (32,530 ) Allowance for loan losses for PCI loans (216 ) (295 ) Total loans, net of allowance for loan losses $ 8,184,281 $ 4,740,396 N ote 1: Purchased credit impaired (“PCI”) loans are being accounted for pursuant to ASC Topic 310-30.
Summary of Allowance for Loan Losses and Recorded Investment in Loans by Portfolio	The table below set forth the activity in the allowance for loan losses for the periods presented. Allowance for loan losses for loans that are not PCI loans Allowance for loan losses on PCI loans Total Three months ended September 30, 2018 Balance at beginning of period $ 37,209 $ 275 $ 37,484 Loans charged-off (1,178 ) — (1,178 ) Recoveries of loans previously charged-off 555 — 555 Net charge-offs (623 ) — (623 ) Provision for loan losses 2,009 (59 ) 1,950 Balance at end of period $ 38,595 $ 216 $ 38,811 Three months ended September 30, 2017 Balance at beginning of period $ 29,769 $ 363 $ 30,132 Loans charged-off (472 ) — (472 ) Recoveries of loans previously charged-off 1,072 — 1,072 Net recoveries 600 — 600 Provision for loan losses 1,174 (78 ) 1,096 Balance at end of period $ 31,543 $ 285 $ 31,828 Allowance for loan losses for loans that are not PCI loans Allowance for loan losses on PCI loans Total Nine months ended September 30, 2018 Balance at beginning of period $ 32,530 $ 295 $ 32,825 Loans charged-off (2,170 ) — (2,170 ) Recoveries of loans previously charged-off 1,898 75 1,973 Net (charge-offs) recoveries (272 ) 75 (197 ) Provision for loan losses 6,337 (154 ) 6,183 Balance at end of period $ 38,595 216 $ 38,811 Nine months ended September 30, 2017 Balance at beginning of period $ 26,569 $ 472 $ 27,041 Loans charged-off (1,722 ) — (1,722 ) Recoveries of loans previously charged-off 2,454 65 2,519 Net recoveries 732 65 797 Provision for loan losses 4,242 (252 ) 3,990 Balance at end of period $ 31,543 $ 285 $ 31,828 The following tables present the activity in the allowance for loan losses by portfolio segment for the periods presented. Real Estate Loans Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses for loans that are not PCI loans: Three months ended September 30, 2018 Beginning of the period $ 5,847 $ 21,921 $ 1,629 $ 5,412 $ 2,400 $ 37,209 Charge-offs (283 ) — (62 ) (327 ) (506 ) (1,178 ) Recoveries 217 113 2 152 71 555 Provision for loan losses 71 916 21 404 597 2,009 Balance at end of period $ 5,852 $ 22,950 $ 1,590 $ 5,641 $ 2,562 $ 38,595 Three months ended September 30, 2017 Beginning of the period $ 6,134 $ 17,238 $ 1,175 $ 3,590 $ 1,632 $ 29,769 Charge-offs (108 ) (8 ) — (140 ) (216 ) $ (472 ) Recoveries 290 320 353 82 27 $ 1,072 Provision for loan losses (292 ) 1,074 (393 ) 458 327 $ 1,174 Balance at end of period $ 6,024 $ 18,624 $ 1,135 $ 3,990 $ 1,770 $ 31,543 Real Estate Loans Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses for loans that are PCI loans: Three months ended September 30, 2018 Beginning of the period $ — $ 59 $ 202 $ — $ 14 $ 275 Charge-offs — — — — — — Recoveries — — — — — — Provision for loan losses — (59 ) — — — (59 ) Balance at end of period $ — $ — $ 202 $ — $ 14 $ 216 Three months ended September 30, 2017 Beginning of the period $ 50 $ 123 $ 176 $ — $ 14 $ 363 Charge-offs — — — — — — Recoveries — — — — — — Provision for loan losses (50 ) (65 ) 37 — — (78 ) Balance at end of period $ — $ 58 $ 213 $ — $ 14 $ 285 Real Estate Loans Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses for loans that are not PCI loans: Nine months ended September 30, 2018 Beginning of the period $ 6,003 $ 19,304 $ 1,179 $ 4,130 $ 1,914 $ 32,530 Charge-offs (419 ) — (62 ) (555 ) (1,134 ) (2,170 ) Recoveries 855 569 3 214 257 1,898 Provision for loan losses (587 ) 3,077 470 1,852 1,525 6,337 Balance at end of period $ 5,852 $ 22,950 $ 1,590 $ 5,641 $ 2,562 $ 38,595 Nine months ended September 30, 2017 Beginning of the period $ 5,640 $ 14,713 $ 883 $ 3,785 $ 1,548 $ 26,569 Charge-offs (250 ) (72 ) — (677 ) (723 ) (1,722 ) Recoveries 816 626 596 254 162 2,454 Provision for loan losses (182 ) 3,357 (344 ) 628 783 4,242 Balance at end of period $ 6,024 $ 18,624 $ 1,135 $ 3,990 $ 1,770 $ 31,543 Real Estate Loans Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses for loans that are PCI loans: Nine months ended September 30, 2018 Beginning of the period $ — $ 59 $ 222 $ — $ 14 $ 295 Charge-offs — — — — — — Recoveries — — — 75 — 75 Provision for loan losses — (59 ) (20 ) (75 ) — (154 ) Balance at end of period $ — $ — $ 202 $ — $ 14 $ 216 Nine months ended September 30, 2017 Beginning of the period $ 54 $ 92 $ 312 $ — $ 14 $ 472 Charge-offs — — — — — — Recoveries — 65 — — — 65 Provision for loan losses (54 ) (99 ) (99 ) — — (252 ) Balance at end of period $ — $ 58 $ 213 $ — $ 14 $ 285
Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method	The following tables present the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of September 30, 2018 and December 31, 2017. Accrued interest receivable and unearned loan fees and costs are not included in the recorded investment because they are not material. Real Estate Loans As of September 30, 2018 Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 417 $ 445 $ — $ 546 $ 5 $ 1,413 Collectively evaluated for impairment 5,435 22,505 1,590 5,095 2,557 37,182 Purchased credit impaired — — 202 — 14 216 Total ending allowance balance $ 5,852 $ 22,950 $ 1,792 $ 5,641 $ 2,576 $ 38,811 Loans: Individually evaluated for impairment $ 7,055 $ 7,686 $ 971 $ 1,292 $ 164 $ 17,168 Collectively evaluated for impairment 1,706,038 4,387,665 644,914 1,103,100 194,439 8,036,156 Purchased credit impaired 62,507 92,444 6,955 5,479 286 167,671 Total ending loan balances $ 1,775,600 $ 4,487,795 $ 652,840 $ 1,109,871 $ 194,889 $ 8,220,995 Real Estate Loans As of December 31, 2017 Residential Commercial Land, develop., constr. Comm. & industrial Consumer & other Total Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 586 $ — $ 4 $ 206 $ 8 $ 804 Collectively evaluated for impairment 5,417 19,304 1,175 3,924 1,906 31,726 Purchased credit impaired — 59 222 — 14 295 Total ending allowance balance $ 6,003 $ 19,363 $ 1,401 $ 4,130 $ 1,928 $ 32,825 Loans: Individually evaluated for impairment $ 8,101 $ 8,218 $ 331 $ 3,497 $ 198 $ 20,345 Collectively evaluated for impairment 1,017,202 2,537,925 235,485 690,004 107,282 4,587,898 Purchased credit impaired 59,975 92,791 6,656 4,444 292 164,158 Total ending loan balance $ 1,085,278 $ 2,638,934 $ 242,472 $ 697,945 $ 107,772 $ 4,772,401
Summary of Impaired Loans	The table below summarizes impaired loan data for the periods presented. Sep. 30, 2018 Dec. 31, 2017 Performing TDRs (these are not included in nonperforming loans ("NPLs")) $ 9,204 $ 12,081 Nonperforming TDRs (these are included in NPLs) 1,284 698 Total TDRs (these are included in impaired loans) 10,488 12,779 Impaired loans that are not TDRs 6,680 7,566 Total impaired loans $ 17,168 $ 20,345
Troubled Debt Restructured Loans by Loans Type	TDRs as of September 30, 2018 and December 31, 2017 quantified by loan type classified separately as accrual (performing loans) and non-accrual (non performing loans) are presented in the tables below. As of September 30, 2018 Accruing Non-Accrual Total Real estate loans: Residential $ 6,525 $ 530 $ 7,055 Commercial 1,855 687 2,542 Land, development, construction 81 41 122 Total real estate loans 8,461 1,258 9,719 Commercial 605 — 605 Consumer and other 138 26 164 Total TDRs $ 9,204 $ 1,284 $ 10,488 As of December 31, 2017 Accruing Non-Accrual Total Real estate loans: Residential $ 7,737 $ 364 $ 8,101 Commercial 3,286 306 3,592 Land, development, construction 332 — 332 Total real estate loans 11,355 670 12,025 Commercial 556 — 556 Consumer and other 170 28 198 Total TDRs $ 12,081 $ 698 $ 12,779
Summary of Loans by Class Modified	The following table presents loans by class modified and for which there was a payment default within twelve months following the modification during the periods ending September 30, 2018 and 2017. Period ending Period ending September 30, 2018 September 30, 2017 Number Recorded Number Recorded of loans investment of loans investment Residential 1 $ 191 1 $ 72 Commercial real estate 1 116 2 616 Land, development, construction — — — — Commercial and Industrial — — — — Consumer and other — — — — Total 2 $ 307 3 $ 688
Summary of Loans Individually Evaluated for Impairment by Class of Loans	The following tables present loans individually evaluated for impairment by class of loans as of September 30, 2018 and December 31, 2017, excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30. The recorded investment is less than the unpaid principal balance due to partial charge-offs. As of September 30, 2018 Unpaid principal balance Recorded investment Allowance for loan losses allocated With no related allowance recorded: Residential real estate $ 4,105 $ 3,977 $ — Commercial real estate 6,634 6,090 — Land, development, construction 1,009 971 — Commercial and industrial 427 416 — Consumer, other 111 111 — With an allowance recorded: Residential real estate 3,235 3,078 417 Commercial real estate 1,600 1,596 445 Land, development, construction — — — Commercial and industrial 880 876 546 Consumer, other 72 53 5 Total $ 18,073 $ 17,168 $ 1,413 As of December 31, 2017 Unpaid principal balance Recorded investment Allowance for loan losses allocated With no related allowance recorded: Residential real estate $ 4,945 $ 4,818 $ — Commercial real estate 8,973 8,218 — Land, development, construction 260 210 — Commercial and industrial 3,374 2,968 — Consumer, other 142 127 — With an allowance recorded: Residential real estate 3,426 3,283 586 Commercial real estate — — — Land, development, construction 140 121 4 Commercial and industrial 531 529 206 Consumer, other 78 71 8 Total $ 21,869 $ 20,345 $ 804
Summary of Impairment by Class of Loans	Three months ended September 30, 2018 Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized Real estate loans: Residential $ 7,328 $ 79 $ — Commercial 7,674 25 — Land, development, construction 961 2 — Total real estate loans 15,963 106 — Commercial and industrial 1,596 9 — Consumer and other loans 165 2 — Total $ 17,724 $ 117 $ — Nine months ended September 30, 2018 Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized Real estate loans: Residential $ 15,306 $ 308 $ — Commercial 2,586 25 — Land, development, construction 324 2 — Total real estate loans 18,216 335 — Commercial and industrial 538 9 — Consumer and other loans 56 2 — Total $ 18,810 $ 346 $ — Three months ended September 30, 2017 Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized Real estate loans: Residential $ 7,536 $ 70 $ — Commercial 9,200 35 — Land, development, construction 343 5 — Total real estate loans 17,079 110 — Commercial and industrial 1,859 7 — Consumer and other loans 262 3 — Total $ 19,200 $ 120 $ — Nine months ended September 30, 2017 Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized Real estate loans: Residential $ 7,767 $ 207 $ — Commercial 8,979 104 — Land, development, construction 465 13 — Total real estate loans 17,211 324 — Commercial and industrial 1,702 22 — Consumer and other loans 245 8 — Total $ 19,158 $ 354 $ —
Summary of Nonperforming Loans	Nonperforming loans include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans, excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30. Nonperforming loans were as follows: Sep. 30, 2018 Dec. 31, 2017 Non accrual loans $ 23,450 $ 17,288 Loans past due over 90 days and still accruing interest — — Total non performing loans $ 23,450 $ 17,288
Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due Over 90 Days Still on Accrual by Class of Loans	The following table presents the recorded investment in nonaccrual loans and loans past due over 90 days still on accrual by class of loans as of September 30, 2018 and December 31, 2017, excluding purchased credit impaired loans: As of September 30, 2018 Nonaccrual Loans past due over 90 days still accruing Residential real estate $ 9,234 $ — Commercial real estate 9,108 — Land, development, construction 2,441 — Commercial 2,237 — Consumer, other 430 — Total $ 23,450 $ — As of December 31, 2017 Nonaccrual Loans past due over 90 days still accruing Residential real estate $ 7,107 $ — Commercial real estate 6,549 — Land, development, construction 138 — Commercial 3,121 — Consumer, other 373 — Total $ 17,288 $ —
Summary Aging of Recorded Investment in Past Due Loans	The following table presents the aging of the recorded investment in past due loans as of September 30, 2018 and December 31, 2017, excluding purchased credit impaired loans: Accruing Loans Total 30 - 59 days past due 60 - 89 days past due Greater than 90 days past due Total Past Due Loans Not Past Due Nonaccrual Loans As of September 30, 2018 Residential real estate $ 1,713,093 $ 4,011 $ 4,177 $ — $ 8,188 $ 1,695,671 $ 9,234 Commercial real estate 4,395,351 8,556 5,907 — 14,463 4,371,780 9,108 Land/dev/construction 645,885 796 526 — 1,322 642,122 2,441 Commercial 1,104,392 2,327 970 — 3,297 1,098,858 2,237 Consumer 194,603 929 191 — 1,120 193,053 430 $ 8,053,324 $ 16,619 $ 11,771 $ — $ 28,390 $ 8,001,484 $ 23,450 Accruing Loans Total 30 - 59 days past due 60 - 89 days past due Greater than 90 days past due Total Past Due Loans Not Past Due Nonaccrual Loans As of December 31, 2017 Residential real estate $ 1,025,303 $ 3,568 $ 1,821 $ — $ 5,389 $ 1,012,807 $ 7,107 Commercial real estate 2,546,143 1,158 2,272 — 3,430 2,536,164 6,549 Land/dev/construction 235,816 2,807 189 — 2,996 232,682 138 Commercial 693,501 568 763 — 1,331 689,049 3,121 Consumer 107,480 471 48 — 519 106,588 373 $ 4,608,243 $ 8,572 $ 5,093 $ — $ 13,665 $ 4,577,290 $ 17,288
Risk Category of Loans by Class of Loans, Excluding Purchased Credit Impaired Loans	As of September 30, 2018 Loan Category Pass Special Mention Substandard Doubtful Residential real estate $ 1,639,770 $ 46,373 $ 26,950 $ — Commercial real estate 4,181,026 167,606 46,719 — Land/dev/construction 604,023 36,933 4,929 — Commercial 1,076,627 23,896 3,869 — Consumer 193,671 263 669 — Total $ 7,695,117 $ 275,071 $ 83,136 $ — As of December 31, 2017 Loan Category Pass Special Mention Substandard Doubtful Residential real estate $ 987,472 $ 20,435 $ 17,396 $ — Commercial real estate 2,411,085 115,942 19,116 — Land/dev/construction 217,555 17,699 562 — Commercial 674,764 14,186 4,551 — Consumer 106,735 139 606 — Total $ 4,397,611 $ 168,401 $ 42,231 $ —
Investment in Residential and Consumer Loans, Excluding Loans from Purchased Credit Impaired Loans	The following table presents the recorded investment in residential and consumer loans, excluding purchased credit impaired loans, based on payment activity as of September 30, 2018 and December 31, 2017: As of September 30, 2018 Residential Consumer Performing $ 1,703,859 $ 194,173 Nonperforming 9,234 430 Total $ 1,713,093 $ 194,603 As of December 31, 2017 Residential Consumer Performing $ 1,018,196 $ 107,107 Nonperforming 7,107 373 Total $ 1,025,303 $ 107,480
Summary of Total Contractually Required Principal and Interest Cash Payments, Management's Estimate of Expected Total Cash Payments and Carrying Value of Loans	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans as of September 30, 2018 and December 31, 2017. Contractually required principal and interest payments have been adjusted for estimated prepayments. Sep. 30, 2018 Dec. 31, 2017 Contractually required principal and interest $ 294,278 $ 248,283 Non-accretable difference (59,433 ) (13,183 ) Cash flows expected to be collected 234,845 235,100 Accretable yield (67,174 ) (70,942 ) Carrying value of acquired loans 167,671 164,158 Allowance for loan losses (216 ) (295 ) Carrying value less allowance for loan losses $ 167,455 $ 163,863
Summary of Changes in Total Contractually Required Principal and Interest Cash Payments	The table below summarizes the changes in total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans during the three and nine month periods ending September 30, 2018 and 2017. Activity during the Effect of income all other three month period ending September 30, 2018 Jun. 30, 2018 acquisitions accretion adjustments Sep. 30, 2018 Contractually required principal and interest $ 285,576 $ 33,687 $ — $ (24,985 ) $ 294,278 Non-accretable difference (44,166 ) (20,763 ) — 5,496 (59,433 ) Cash flows expected to be collected 241,410 12,924 — (19,489 ) 234,845 Accretable yield (67,460 ) (1,492 ) 7,682 (5,904 ) (67,174 ) Carry value of acquired loans $ 173,950 $ 11,432 $ 7,682 $ (25,393 ) $ 167,671 Activity during the Effect of income all other nine month period ending September 30, 2018 Dec. 31, 2017 acquisitions accretion adjustments Sep. 30, 2018 Contractually required principal and interest $ 248,283 $ 122,392 $ — $ (76,397 ) $ 294,278 Non-accretable difference (13,183 ) (58,927 ) — 12,677 (59,433 ) Cash flows expected to be collected 235,100 63,465 — (63,720 ) 234,845 Accretable yield (70,942 ) (7,770 ) 26,496 (14,958 ) (67,174 ) Carry value of acquired loans $ 164,158 $ 55,695 $ 26,496 $ (78,678 ) $ 167,671 Activity during the Effect of income all other three month period ending September 30, 2017 Jun. 30, 2017 acquisitions accretion adjustments Sep. 30, 2018 Contractually required principal and interest $ 280,114 $ — $ — $ (21,776 ) $ 258,338 Non-accretable difference (14,047 ) — — 1,148 (12,899 ) Cash flows expected to be collected 266,067 — — (20,628 ) 245,439 Accretable yield (86,703 ) — 7,696 (2,457 ) (81,464 ) Carry value of acquired loans $ 179,364 $ — $ 7,696 $ (23,085 ) $ 163,975 Activity during the Effect of income all other nine month period ending September 30, 2017 Dec. 31, 2016 acquisitions accretion adjustments Sep. 30, 2018 Contractually required principal and interest $ 297,821 $ 20,729 $ — $ (60,212 ) $ 258,338 Non-accretable difference (18,372 ) (6,347 ) — 11,820 (12,899 ) Cash flows expected to be collected 279,449 14,382 — (48,392 ) 245,439 Accretable yield (93,525 ) (3,266 ) 24,780 (9,453 ) (81,464 ) Carry value of acquired loans $ 185,924 $ 11,116 $ 24,780 $ (57,845 ) $ 163,975

Loans Held for Sale (Tables)

Loans Held for Sale (Tables)	9 Months Ended
	Sep. 30, 2018
Loans Receivable Held For Sale Net [Abstract]
Summary of Activity in Mortgage Loans Held for Sale	The table below summarizes the activity in mortgage loans held for sale during the three month periods ending September 30, 2018 and 2017. Three month periods ended Nine month periods ended Sep. 30, 2018 Sep. 30, 2017 Sep. 30, 2018 Sep. 30, 2017 Beginning balance $ 36,366 $ 8,959 $ 19,647 $ 2,285 Effect from acquisitions 2,835 — 8,959 — Loans originated 91,910 23,444 242,226 53,806 Proceeds from sales (94,226 ) (20,564 ) (238,613 ) (44,780 ) Change in fair value 1 — 723 — Net realized gain on sales 2,668 404 6,612 932 Ending balance $ 39,554 $ 12,243 $ 39,554 $ 12,243
Summary of Notional Amounts for Interest Rate Lock Commitments and Best Efforts Forward Trades and MBS Forward Trades Pertaining to Loans Held for Sale	The table below summarizes the notional amounts for interest rate lock commitments, best efforts forward trades and MBS forward trades pertaining to loans held for sale at September 30, 2018. Notional Interest rate lock commitments $ 75,811 Best efforts forward trades 66,425 MBS forward trades 27,000 Total derivative instruments $ 169,236

Securities Sold Under Agreeme_2

Securities Sold Under Agreement to Repurchase (Tables)	9 Months Ended
	Sep. 30, 2018
Banking And Thrift [Abstract]
Summary of Repurchase Agreement	The following table provides additional details for the periods presented. MBS Municipal As of September 30, 2018 Securities Securities Total Market value of securities pledged $ 66,849 $ 434 $ 67,283 Borrowings related to pledged amounts 51,195 116 51,311 Market value pledged as a % of borrowings 131 % 374 % 131 % As of December 31, 2017 Market value of securities pledged $ 59,239 $ 443 $ 59,682 Borrowings related to pledged amounts 52,030 50 52,080 Market value pledged as a % of borrowings 114 % 886 % 115 %

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2018
Pro-Forma Financial Information of Acquisition	Pro-forma data for the three month period ending September 30, 2017 listed in the table below presents pro-forma information as if the Gateway, Sunshine, Harbor and Charter acquisitions occurred at the beginning of 2017. Pro-forma data for the nine month period ending September 30, 2017 listed in the table below presents pro-forma information as if the Platinum, Gateway, Sunshine, Harbor and Charter acquisitions occurred at the beginning of 2017. Pro-forma data for the three and nine month periods ending September 30, 2018 listed in the table below presents pro-forma information as if the Charter acquisition occurred at the beginning of 2017. Three months ended September 30, Nine months ended September 30, 2018 2017 2018 2017 Net interest income $ 112,182 $ 109,779 $ 339,786 $ 315,211 Net income available to common shareholders $ 51,250 $ 32,011 $ 131,102 $ 89,823 EPS - basic $ 0.54 $ 0.34 $ 1.38 $ 0.96 EPS - diluted $ 0.53 $ 0.33 $ 1.36 $ 0.94
Platinum Bank Holding Company [Member]
Summary of Purchase Price Calculation	The table below summarizes the purchase price calculation. Number of shares of Platinum common stock outstanding at March 31, 2017 1,131,134 Per share exchange ratio 3.7832 Number of shares of CenterState common stock less 51 of fractional shares 4,279,255 Multiplied by CenterState common stock price per share on March 31, 2017 $ 25.90 Fair value of CenterState common stock issued $ 110,833 Total Platinum common shares 1,131,134 Multiplied by the cash consideration each Platinum share is entitled to receive $ 7.60 Total cash consideration, not including cash for fractional shares $ 8,597 Total stock consideration $ 110,833 Total cash consideration plus $1 for 51 of fractional shares $ 8,598 Total purchase price $ 119,431
Summary of Fair Value of Assets Purchased, Including Goodwill and Liabilities Assumed	The list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the April 1, 2017 purchase date. April 1, 2017 Assets: Cash and cash equivalents $ 106,537 Loans, held for investment 442,366 Purchased credit impaired loans 12,218 Investments 28,873 Accrued interest receivable 1,216 Branch real estate 9,600 Furniture and fixtures 402 Bank property held for sale 4,382 FHLB stock 2,220 Other repossessed real estate owned 272 Core deposit intangible 3,992 Goodwill 73,829 Deferred tax asset 227 Other assets 29 Total assets acquired $ 686,163 Liabilities: Deposits $ 520,423 Federal Home Loan Bank advances 40,546 Securities sold under agreement to repurchase 5,569 Accrued interest payable 94 Other liabilities 100 Total liabilities assumed $ 566,732
Summary of Contractually Required Principal and Interest Cash Payments for Purchased Credit Impaired Loans	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of April 1, 2017 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 18,811 Non-accretable difference (4,639 ) Cash flows expected to be collected 14,172 Accretable yield (1,954 ) Total purchased credit-impaired loans acquired $ 12,218
Summary of Fair Value of Acquired Loans and Unpaid Principal Balance	The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 37,206 $ 37,419 Commercial real estate 262,612 259,727 Construction/development/land 47,675 46,618 Commercial loans 96,587 95,701 Consumer and other loans 2,954 2,901 Purchased credit-impaired 16,530 12,218 Total earning assets $ 463,564 $ 454,584
Gateway Financial Holdings Of Florida Inc [Member]
Summary of Purchase Price Calculation	The table below summarizes the purchase price calculation. Number of shares of Gateway common stock outstanding at April 30, 2017 5,463,764 Gateway preferred shares that converted to Gateway common shares upon a change in control 919,236 Total Gateway common shares including conversion of preferred shares 6,383,000 Number of shares of Gateway common shares exchanged for CenterState common stock 4,468,100 Per share exchange ratio 0.95 Number of shares of CenterState common stock less 254 of fractional shares 4,244,441 Multiplied by CenterState common stock price per share on April 30, 2017 $ 25.23 Fair value of CenterState common stock issued $ 107,087 Number of shares of Gateway common shares exchanged for cash 1,914,900 Multiplied by the cash consideration each Gateway share is entitled to receive $ 18.00 Total cash consideration, not including cash for fractional shares $ 34,468 Total stock consideration $ 107,087 Total cash consideration plus $6 for 254 of fractional shares $ 34,474 Total consideration paid to Gateway common shareholders $ 141,561 Fair value of Gateway stock options converted to CenterState stock options $ 15,811 Total purchase price $ 157,372
Summary of Fair Value of Assets Purchased, Including Goodwill and Liabilities Assumed	The list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the May 1, 2017 purchase date. May 1, 2017 Assets: Cash and cash equivalents $ 23,065 Loans, held for investment 560,413 Purchased credit impaired loans 7,827 Investments 231,951 Accrued interest receivable 2,422 Branch real estate 18,160 Furniture and fixtures 702 Bank property held for sale 1,087 Federal Reserve Bank and Federal Home Loan Bank stock 4,640 Other repossessed real estate owned 134 Bank owned life insurance 15,475 Servicing asset 271 Core deposit intangible 8,432 Goodwill 77,826 Deferred tax asset 7,246 Other assets 1,217 Total assets acquired $ 960,868 Liabilities: Deposits $ 708,209 Federal Home Loan Bank advances 90,598 Federal funds purchased 3,588 Accrued interest payable 304 Other liabilities 797 Total liabilities assumed $ 803,496
Summary of Contractually Required Principal and Interest Cash Payments for Purchased Credit Impaired Loans	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of May 1, 2017 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 12,523 Non-accretable difference (2,465 ) Cash flows expected to be collected 10,058 Accretable yield (2,231 ) Total purchased credit-impaired loans acquired $ 7,827
Summary of Fair Value of Acquired Loans and Unpaid Principal Balance	The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 142,881 $ 142,468 Commercial real estate 321,262 317,578 Construction/development/land 47,727 46,489 Commercial loans 46,953 46,274 Consumer and other loans 7,803 7,604 Purchased credit-impaired 11,093 7,827 Total earning assets $ 577,719 $ 568,240
Sunshine Bancorp, Inc. [Member]
Summary of Purchase Price Calculation	The table below summarizes the purchase price calculation. Number of shares of Sunshine common stock outstanding at December 31, 2017 7,922,479 Per share exchange ratio 0.89 Number of shares of CenterState common stock less 361 of fractional shares 7,050,645 CenterState common stock price per share on December 29, 2017 $ 25.73 Fair value of CenterState common stock issued $ 181,413 Cash consideration paid for 361 of fractional shares 7 Total consideration to be paid to Sunshine common shareholders $ 181,420 Fair value of Sunshine stock options converted to CenterState stock options 6,432 Total Purchase Price for Sunshine $ 187,852
Summary of Fair Value of Assets Purchased, Including Goodwill and Liabilities Assumed	The list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the January 1, 2018 purchase date. January 1, 2018 Assets: Cash and cash equivalents $ 47,056 Loans, held for investment 676,090 Purchased credit impaired loans 8,232 Loans held for sale 430 Investments 93,006 Accrued interest receivable 2,170 Branch real estate 9,375 Furniture and fixtures 916 Bank property held for sale 9,503 FHLB stock 4,875 Bank owned life insurance 23,101 Core deposit intangible 8,525 Goodwill 114,228 Deferred tax asset 11,670 Other assets 6,135 Total assets acquired $ 1,015,312 Liabilities: Deposits $ 719,039 Federal Home Loan Bank advances 95,001 Securities sold under agreement to repurchase 353 Subordinated notes 11,000 Accrued interest payable 457 Other liabilities 1,610 Total liabilities assumed $ 827,460
Summary of Contractually Required Principal and Interest Cash Payments for Purchased Credit Impaired Loans	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of January 1, 2018 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 21,598 Non-accretable difference (12,213 ) Cash flows expected to be collected 9,385 Accretable yield (1,153 ) Total purchased credit-impaired loans acquired $ 8,232
Summary of Fair Value of Acquired Loans and Unpaid Principal Balance	The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 148,342 $ 146,057 Commercial real estate 375,377 371,323 Construction/development/land 58,530 57,331 Commercial loans 104,811 99,650 Consumer and other loans 1,770 1,729 Purchased credit-impaired 18,149 8,232 Total earning assets $ 706,979 $ 684,322
HCBF Holding Company, Inc. [Member]
Summary of Purchase Price Calculation	The table below summarizes the purchase price calculation. Number of shares of Harbor common stock outstanding at December 31, 2017 22,299,082 Per share exchange ratio 0.675 Number of shares of CenterState common stock less 241 of fractional shares 15,051,639 CenterState common stock price per share on December 29, 2017 $ 25.73 Fair value of CenterState common stock issued $ 387,279 Number of shares of Harbor common stock outstanding at December 31, 2017 22,299,082 Cash consideration each Harbor share is entitled to receive $ 1.925 Total Cash Consideration plus $6 for 241 of fractional shares $ 42,932 Total Stock Consideration $ 387,279 Total Cash Consideration 42,932 Total consideration to be paid to Harbor common shareholders $ 430,211 Fair value of Harbor stock options converted to CenterState stock options $ 18,025 Total Purchase Price for Harbor $ 448,236
Summary of Fair Value of Assets Purchased, Including Goodwill and Liabilities Assumed	The list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the January 1, 2018 purchase date. January 1, 2018 Assets: Cash and cash equivalents $ 77,176 Loans, held for investment 1,290,004 Purchased credit impaired loans 36,031 Loans held for sale 5,694 Investments 585,297 Accrued interest receivable 5,847 Branch real estate 34,035 Furniture and fixtures 3,571 Bank property held for sale 14,140 FHLB and other stock 9,488 Bank owned life insurance 39,089 Other real estate owned 5,144 Core deposit intangible 23,625 Goodwill 233,321 Deferred tax asset 14,071 Other assets 2,536 Total assets acquired $ 2,379,069 Liabilities: Deposits $ 1,755,155 Federal Home Loan Bank advances 157,919 Corporate debentures 5,872 Accrued interest payable 478 Other liabilities 11,409 Total liabilities assumed $ 1,930,833
Summary of Contractually Required Principal and Interest Cash Payments for Purchased Credit Impaired Loans	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of January 1, 2018 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 67,107 Non-accretable difference (25,951 ) Cash flows expected to be collected 41,156 Accretable yield (5,125 ) Total purchased credit-impaired loans acquired $ 36,031
Summary of Fair Value of Acquired Loans and Unpaid Principal Balance	The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 370,611 $ 363,559 Commercial real estate 636,517 627,900 Construction/development/land 149,547 146,639 Commercial loans 113,818 110,630 Consumer and other loans 41,660 41,276 Purchased credit-impaired 54,320 36,031 Total earning assets $ 1,366,473 $ 1,326,035
Charter Financial Corporation [Member]
Summary of Purchase Price Calculation	The table below summarizes the purchase price calculation. Number of shares of Charter common stock outstanding at August 31, 2018 15,480,776 Per share exchange ratio 0.738 Number of shares of CenterState common stock less 599 of fractional shares 11,424,214 CenterState common stock price per share on August 31, 2018 $ 30.62 Fair value of CenterState common stock issued $ 349,809 Number of shares of Charter common stock outstanding at August 31, 2018 15,480,776 Cash consideration each Charter share is entitled to receive $ 2.300 Total Cash Consideration plus $17 for 599 of fractional shares $ 35,624 Total Stock Consideration $ 349,809 Total Cash Consideration 35,624 Total consideration to be paid to Charter common shareholders $ 385,433 Cash out of Charter stock options 4,043 Total Purchase Price for Charter $ 389,476
Summary of Fair Value of Assets Purchased, Including Goodwill and Liabilities Assumed	The list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the September 1, 2018 purchase date. September 1, 2018 Assets: Cash and cash equivalents $ 184,020 Loans, held for investment 1,130,240 Purchased credit impaired loans 11,432 Loans held for sale 2,835 Investments 73,808 Accrued interest receivable 3,684 Branch real estate 27,930 Furniture and fixtures 1,988 Bank property held for sale 1,695 FHLB and other stock 1,483 Bank owned life insurance 54,813 Other real estate owned 257 Core deposit intangible 19,795 Goodwill 197,648 Deferred tax asset 1,966 Other assets 20,947 Total assets acquired $ 1,734,541 Liabilities: Deposits $ 1,321,970 Corporate debentures 9,000 Accrued interest payable 1,015 Other liabilities 13,080 Total liabilities assumed $ 1,345,065
Summary of Contractually Required Principal and Interest Cash Payments for Purchased Credit Impaired Loans	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of September 1, 2018 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 33,687 Non-accretable difference (20,763 ) Cash flows expected to be collected 12,924 Accretable yield (1,492 ) Total purchased credit-impaired loans acquired $ 11,432
Summary of Fair Value of Acquired Loans and Unpaid Principal Balance	The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 284,505 $ 280,200 Commercial real estate 567,506 557,730 Construction/development/land 181,128 178,687 Commercial loans 88,308 87,062 Consumer and other loans 26,221 26,561 Purchased credit-impaired 17,122 11,432 Total earning assets $ 1,164,790 $ 1,141,672

Interest Rate Swap Derivatives

Interest Rate Swap Derivatives (Tables)	9 Months Ended
	Sep. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary Information about the Interest Rate Swap Derivative Instruments	Summary information about the interest rate swap derivative instruments is as follows: Sep. 30, 2018 Dec. 31, 2017 Notional amount $ 5,044,615 $ 3,740,430 Weighted average pay rate on interest-rate swaps 3.49 % 3.00 % Weighted average receive rate on interest rate swaps 3.48 % 3.00 % Weighted average maturity (years) 11 11 Fair value of interest rate swap derivatives (asset) $ 87,946 $ 42,480 Fair value of interest rate swap derivatives (liability) $ 88,065 $ 43,259

Common Stock Outstanding and _3

Common Stock Outstanding and Earnings Per Share Data - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Anti dilutive stock options	0	0	0	0

Common Stock Outstanding and _4

Common Stock Outstanding and Earnings Per Share Data - Factors Used in Earnings Per Share Computations (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic
Net income available to common shareholders		$ 37,985	$ 22,050	$ 105,784	$ 53,883
Less: Earnings allocated to participating securities		(28)	(46)	(84)	(121)
Net income allocated to common shareholders		$ 37,957	$ 22,004	$ 105,700	$ 53,762
Weighted average common shares outstanding including participating securities		87,881,806	60,032,804	85,026,929	56,442,506
Less: Participating securities	[1]	(68,135)	(126,194)	(68,652)	(126,806)
Average shares	[2]	87,813,671	59,906,610	84,958,277	56,315,700
Basic earnings per common share		$ 0.43	$ 0.37	$ 1.24	$ 0.95
Diluted
Net income available to common shareholders		$ 37,957	$ 22,004	$ 105,700	$ 53,762
Weighted average common shares outstanding for basic earnings per common share	[2]	87,813,671	59,906,610	84,958,277	56,315,700
Add: Dilutive effects of stock based compensation awards		997,031	1,208,395	1,251,432	1,014,567
Average shares and dilutive potential common shares	[2]	88,810,702	61,115,005	86,209,709	57,330,267
Diluted earnings per common share		$ 0.43	$ 0.36	$ 1.23	$ 0.94
[1]	Participating securities are restricted stock awards whereby the stock certificates have been issued, are included in outstanding shares, receive dividends and can be voted, but have not vested.
[2]	Excludes participating shares.

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets:
Trading securities, at fair value		$ 6,777
Available for sale securities	$ 1,536,842	1,060,143
Loans held for sale, at fair value, carrying amount	39,554	19,647
Mortgage banking derivatives, carrying amount assets	938
Interest rate swap derivatives, carrying amount assets	87,946	42,480
Liabilities:
Mortgage banking derivatives, carrying amount liability	27
Interest rate swap derivatives, carrying amount liability	88,065	43,259
Mortgage Backed Securities [Member]
Assets:
Available for sale securities	1,412,459	972,611
Municipal Securities [Member]
Assets:
Available for sale securities	78,378	72,758
U.S. Treasury Securities [Member]
Assets:
Available for sale securities		5,200
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Trading securities, at fair value		6,777
Available for sale securities	1,536,842	1,060,143
Fair Value Measurements on Recurring [Member] | Carrying value [Member]
Assets:
Trading securities, at fair value		6,777
Loans held for sale, at fair value, carrying amount	39,554
Mortgage banking derivatives, carrying amount assets	938
Interest rate swap derivatives, carrying amount assets	87,946	42,480
Liabilities:
Mortgage banking derivatives, carrying amount liability	27
Interest rate swap derivatives, carrying amount liability	88,065	43,259
Fair Value Measurements on Recurring [Member] | Carrying value [Member] | Corporate Debt Securities [Member]
Assets:
Available for sale securities	6,361
Fair Value Measurements on Recurring [Member] | Carrying value [Member] | Obligations of U.S. Government Sponsored Entities and Agencies [Member]
Assets:
Available for sale securities	39,644	9,574
Fair Value Measurements on Recurring [Member] | Carrying value [Member] | Mortgage Backed Securities [Member]
Assets:
Available for sale securities	1,412,459	972,611
Fair Value Measurements on Recurring [Member] | Carrying value [Member] | Municipal Securities [Member]
Assets:
Available for sale securities	78,378	72,758
Fair Value Measurements on Recurring [Member] | Carrying value [Member] | U.S. Treasury Securities [Member]
Assets:
Available for sale securities		5,200
Fair Value Measurements on Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Trading securities, at fair value		6,777
Loans held for sale, at fair value, carrying amount	39,554
Interest rate swap derivatives, carrying amount assets	87,946	42,480
Liabilities:
Interest rate swap derivatives, carrying amount liability	88,065	43,259
Fair Value Measurements on Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]
Assets:
Available for sale securities	6,361
Fair Value Measurements on Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Obligations of U.S. Government Sponsored Entities and Agencies [Member]
Assets:
Available for sale securities	39,644	9,574
Fair Value Measurements on Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage Backed Securities [Member]
Assets:
Available for sale securities	1,412,459	972,611
Fair Value Measurements on Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Municipal Securities [Member]
Assets:
Available for sale securities	78,378	72,758
Fair Value Measurements on Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Securities [Member]
Assets:
Available for sale securities		$ 5,200
Fair Value Measurements on Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Mortgage banking derivatives, carrying amount assets	938
Liabilities:
Mortgage banking derivatives, carrying amount liability	$ 27

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans with allocated allowance for loan losses	$ 10,102		$ 10,102		$ 11,673
Impaired valuation allowance	1,195		1,195		$ 477
Provision for loan loss expense on impaired loans	1,950	$ 1,096	6,183	$ 3,990
Repossessed real estate owned valuation write down	170	141	464	612
Impairment on bank property held for sale	247	0	2,587	507
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Provision for loan loss expense on impaired loans	$ 682	$ 384	$ 1,026	$ 779
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Capitalization rates to determine fair value of collateral	7.00%		7.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Capitalization rates to determine fair value of collateral	10.00%		10.00%

Fair Value - Assets and Liabi_2

Fair Value - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value Measurements on Non-Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans on Residential real estate at Carrying value	$ 2,312	$ 2,423
Impaired loans on Commercial real estate at Carrying value	5,350	6,293
Impaired loans on Land, land development and construction at Carrying value	942	292
Impaired loans on Commercial at Carrying value	251	2,131
Impaired loans on Consumer at Carrying value	52	57
Other real estate owned on Residential real estate at Carrying value	117	635
Other real estate owned on Commercial real estate at Carrying value	261	261
Other real estate owned on Land, land development and construction at Carrying value	1,312	1,481
Bank owned real estate held for sale	5,805	1,516
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bank owned real estate held for sale	5,805	1,516
Impaired loans on Residential real estate	2,312	2,423
Impaired loans on Commercial real estate	5,350	6,293
Impaired loans on Land, land development and construction	942	292
Impaired loans on Commercial	251	2,131
Impaired loans on Consumer	52	57
Other real estate owned on Residential real estate	117	635
Other real estate owned on Commercial real estate	261	261
Other real estate owned on Land, land development and construction	$ 1,312	$ 1,481

Fair Value - Carrying Amounts a

Fair Value - Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financial assets:
Cash and cash equivalents	$ 606,331		$ 280,619
Cash and cash equivalents, fair value	606,331		280,619
Trading securities, at fair value			6,777
Investment securities available for sale, at fair value	1,536,842		1,060,143
Investment securities held to maturity, carrying amount	219,850		232,399
Investment securities held to maturity, at fair value	211,262		231,615
Federal Home Loan Bank, Federal Reserve Bank and other stock, at cost	70,311		34,876
Loans held for sale, at fair value, carrying amount	39,554		19,647
Loans held for sale, fair value	39,554	$ 36,366	19,647	$ 12,243	$ 8,959	$ 2,285
Loans, net, carrying amount	8,184,281		4,740,396
Loans, net, fair value	8,125,840		4,731,514
Mortgage banking derivatives, carrying amount assets	938
Interest rate swap derivatives, carrying amount assets	87,946		42,480
Interest rate swap derivatives, assets fair value	87,946		42,480
Accrued interest receivable, carrying amount	32,972		18,628
Accrued interest receivable, fair value	32,972		18,628
Mortgage banking derivatives, assets fair value	938
Financial liabilities:
Deposits- without stated maturities, carrying amount	7,612,238		4,727,840
Deposits- without stated maturities, fair value	7,612,238		4,727,840
Deposits- with stated maturities, carrying amount	1,862,288		832,683
Deposits- with stated maturities, fair value	1,867,827		845,039
Securities sold under agreement to repurchase, fair value	51,311		52,080
Securities sold under agreement to repurchase	51,311		52,080
Federal funds purchased and other borrowings, carrying amount	643,002		506,490
Corporate debentures, carrying amount	41,328		26,192
Federal funds purchased and other borrowings, fair value	643,002		506,490
Mortgage banking derivatives, carrying amount liability	27
Interest rate swap derivatives, carrying amount	88,065		43,259
Corporate debentures, fair value	37,928		22,363
Accrued interest payable, carrying amount	2,570		1,169
Interest rate swap derivatives, fair value	88,065		43,259
Accrued interest payable, fair value	2,570		1,169
Mortgage banking derivatives, liability fair value	27
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents, fair value	606,331		280,619
Financial liabilities:
Deposits- without stated maturities, fair value	7,612,238		4,727,840
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Trading securities, at fair value			6,777
Investment securities available for sale, at fair value	1,536,842		1,060,143
Investment securities held to maturity, at fair value	211,262		231,615
Loans held for sale, fair value	39,554		19,647
Interest rate swap derivatives, assets fair value	87,946		42,480
Accrued interest receivable, fair value	6,798		5,370
Financial liabilities:
Deposits- with stated maturities, fair value	1,867,827		845,039
Securities sold under agreement to repurchase, fair value	51,311		52,080
Federal funds purchased and other borrowings, fair value	643,002		506,490
Interest rate swap derivatives, fair value	88,065		43,259
Accrued interest payable, fair value	2,570		1,169
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Loans, net, fair value	8,125,840		4,731,514
Accrued interest receivable, fair value	26,174		13,258
Mortgage banking derivatives, assets fair value	938
Financial liabilities:
Corporate debentures, fair value	37,928		$ 22,363
Mortgage banking derivatives, liability fair value	$ 27

Reportable Segments - Reconcili

Reportable Segments - Reconciliation of Reportable Segment Revenues, Expenses and Profit (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Interest income	$ 114,663	$ 67,057	$ 328,451	$ 182,904
Interest expense	(12,810)	(4,471)	(31,051)	(10,980)
Net interest income	101,853	62,586	297,400	171,924
Provision for loan losses	(1,950)	(1,096)	(6,183)	(3,990)
Non interest income	27,104	16,741	72,731	48,217
Non interest expense	(77,339)	(44,622)	(232,947)	(137,474)
Income before provision for income taxes	49,668	33,609	131,001	78,677
Income tax (provision) benefit	(11,683)	(11,559)	(25,217)	(24,794)
Net income	37,985	22,050	105,784	53,883
Total assets	12,274,365	6,822,861	12,274,365	6,822,861	$ 7,123,975
Operating Segments [Member] | Commercial and Retail Banking [Member]
Segment Reporting Information [Line Items]
Interest income	110,764	64,410	317,851	175,015
Interest expense	(9,992)	(3,305)	(23,689)	(7,934)
Net interest income	100,772	61,105	294,162	167,081
Provision for loan losses	(1,965)	(1,113)	(6,039)	(4,073)
Non interest income	18,808	9,528	49,228	26,493
Non interest expense	(70,652)	(38,432)	(213,934)	(119,304)
Income before provision for income taxes	46,963	31,088	123,417	70,197
Income tax (provision) benefit	(11,086)	(10,579)	(28,585)	(22,900)
Net income	35,877	20,509	94,832	47,297
Total assets	11,604,329	6,319,532	11,604,329	6,319,532
Operating Segments [Member] | Correspondent Banking And Capital Markets Division [Member]
Segment Reporting Information [Line Items]
Interest income	3,899	2,647	10,600	7,889
Interest expense	(2,005)	(819)	(4,734)	(2,048)
Net interest income	1,894	1,828	5,866	5,841
Provision for loan losses	15	17	(144)	83
Non interest income	8,296	7,213	23,495	21,724
Non interest expense	(5,678)	(5,304)	(16,172)	(15,594)
Income before provision for income taxes	4,527	3,754	13,045	12,054
Income tax (provision) benefit	(1,147)	(1,448)	(3,305)	(4,649)
Net income	3,380	2,306	9,740	7,405
Total assets	661,880	498,669	661,880	498,669
Corporate Overhead and Administration [Member]
Segment Reporting Information [Line Items]
Interest expense	(813)	(347)	(2,628)	(998)
Net interest income	(813)	(347)	(2,628)	(998)
Non interest income			8
Non interest expense	(1,009)	(886)	(2,841)	(2,576)
Income before provision for income taxes	(1,822)	(1,233)	(5,461)	(3,574)
Income tax (provision) benefit	550	468	6,673	2,755
Net income	(1,272)	(765)	1,212	(819)
Total assets	1,969,635	940,571	1,969,635	940,571
Elimination Entries [Member]
Segment Reporting Information [Line Items]
Total assets	$ (1,961,479)	$ (935,911)	$ (1,961,479)	$ (935,911)

Investment Securities Available

Investment Securities Available for Sale - Fair Value of Available for Sale Securities and Related Gross Unrealized Gains and Losses Recognized in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,587,074	$ 1,069,526
Gross Unrealized Gains	307	1,815
Gross Unrealized Losses	50,539	11,198
Fair Value	1,536,842	1,060,143
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,460,552	982,565
Gross Unrealized Gains	54	752
Gross Unrealized Losses	48,147	10,706
Fair Value	1,412,459	972,611
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	79,375	71,961
Gross Unrealized Gains	151	863
Gross Unrealized Losses	1,148	66
Fair Value	78,378	72,758
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		5,000
Gross Unrealized Gains		200
Gross Unrealized Losses		0
Fair Value		5,200
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,265
Gross Unrealized Gains	96
Gross Unrealized Losses	0
Fair Value	6,361
Obligations of U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,882	10,000
Gross Unrealized Gains	6	0
Gross Unrealized Losses	1,244	426
Fair Value	$ 39,644	$ 9,574

Investment Securities Availab_2

Investment Securities Available for Sale - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)Security	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)Security
Schedule of Available-for-sale Securities [Line Items]
Tax provision related to net realized gains	$ 0	$ 0	$ (6,000)	$ 0
Securities estimated fair value	$ 884,542,000		$ 884,542,000		$ 255,788,000
Debt securities, held-to-maturity, restricted [extensible list]	us-gaap:CollateralPledgedMember		us-gaap:CollateralPledgedMember		us-gaap:CollateralPledgedMember
Percentage of AFS securities held by any one issuer as a percentage of stockholders' equity	10.00%		10.00%		10.00%
Number of securities representing specified criteria | Security			0		0
Percentage of mortgage-backed securities held from U.S. government-sponsored entities and agencies	100.00%		100.00%
Sunshine Bancorp, Inc. [Member]
Schedule of Available-for-sale Securities [Line Items]
Gain (loss) on sale of securities acquired through acquisition			$ 0
HCBF Holding Company, Inc. [Member]
Schedule of Available-for-sale Securities [Line Items]
Gain (loss) on sale of securities acquired through acquisition			$ 0

Investment Securities Availab_3

Investment Securities Available for Sale - Schedule of Sales of Available for Sale Securities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Investments Debt And Equity Securities [Abstract]
Proceeds	$ 364,152	$ 260,824
Gross gains	68	0
Gross losses	$ 90	$ 0

Investment Securities Availab_4

Investment Securities Available for Sale - Fair Value and Amortized Cost of Investment Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Investment securities available for sale, Due one year or less, Amortized Cost	$ 781
Investment securities available for sale, Due after one year through five years, Amortized Cost	5,502
Investment securities available for sale, Due after five years through ten years, Amortized Cost	30,535
Investment securities available for sale, Due after ten years through thirty years, Amortized Cost	89,704
Investment securities available for sale, Mortgage backed securities, Amortized Cost	1,460,552
Amortized Cost	1,587,074	$ 1,069,526
Investment securities available for sale, Due one or less, Fair Value	782
Investment securities available for sale, Due after one year through five years, Fair Value	5,537
Investment securities available for sale, Due after five years through ten years, Fair Value	29,657
Investment securities available for sale, Due after ten years through thirty years, Fair Value	88,407
Investment securities available for sale, Mortgage backed securities, Fair Value	1,412,459
Fair Value	$ 1,536,842	$ 1,060,143

Investment Securities Availab_5

Investment Securities Available for Sale - Investments Gross Unrealized Losses and Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 1,144,947	$ 489,623
Less than 12 months, Unrealized Losses	30,546	3,364
12 months or more, Fair Value	369,213	325,640
12 months or more, Unrealized Losses	19,993	7,834
Total, Fair Value	1,514,160	815,263
Total, Unrealized Losses	50,539	11,198
Obligations of U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	27,193	0
Less than 12 months, Unrealized Losses	352	0
12 months or more, Fair Value	9,108	9,574
12 months or more, Unrealized Losses	892	426
Total, Fair Value	36,301	9,574
Total, Unrealized Losses	1,244	426
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	1,047,726	477,925
Less than 12 months, Unrealized Losses	29,046	3,298
12 months or more, Fair Value	360,105	316,066
12 months or more, Unrealized Losses	19,101	7,408
Total, Fair Value	1,407,831	793,991
Total, Unrealized Losses	48,147	10,706
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	70,028	11,698
Less than 12 months, Unrealized Losses	1,148	66
12 months or more, Fair Value	0	0
12 months or more, Unrealized Losses	0	0
Total, Fair Value	70,028	11,698
Total, Unrealized Losses	$ 1,148	$ 66

Investment Securities Held to M

Investment Securities Held to Maturity - Fair Value of Held to Maturity Securities and Related Gross Unrecognized Gains and Losses (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 219,850	$ 232,399
Gross Unrecognized Gains	410	1,781
Gross Unrecognized Losses	8,998	2,565
Held-to-maturity securities, fair value	211,262	231,615
Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	87,872	100,039
Gross Unrecognized Gains	0	0
Gross Unrecognized Losses	3,627	1,068
Held-to-maturity securities, fair value	84,245	98,971
Municipal Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	131,978	132,360
Gross Unrecognized Gains	410	1,781
Gross Unrecognized Losses	5,371	1,497
Held-to-maturity securities, fair value	$ 127,017	$ 132,644

Investment Securities Held to_2

Investment Securities Held to Maturity - Additional Information (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018USD ($)Security	Dec. 31, 2017USD ($)Security
Schedule of Held-to-maturity Securities [Line Items]
Number of securities representing specified criteria	0	0
Percentage of HTM securities held by any one issuer as a percentage of stockholders' equity	10.00%
Held to maturity securities pledged, carrying amount | $	$ 104,650	$ 97,389
Debt securities, available-for-sale, restriction type [extensible list]	us-gaap:CollateralPledgedMember	us-gaap:CollateralPledgedMember
Percentage of mortgage-backed securities held from U.S. government-sponsored entities and agencies	100.00%
Held-to-maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Number of securities representing specified criteria	0
Percentage of mortgage-backed securities held from U.S. government-sponsored entities and agencies	100.00%

Investment Securities Held to_3

Investment Securities Held to Maturity - Fair Value and Amortized Cost of Investment Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Investment securities held-to-maturity, Due after five years through ten years, Fair Value	$ 2,039
Investment securities held-to-maturity, Due after ten years through thirty years, Fair Value	124,978
Investment securities held-to-maturity, Mortgage backed securities, Fair Value	84,245
Investment securities held-to- maturity, Fair Value	211,262	$ 231,615
Investment securities held-to-maturity, Due after five years through ten years, Amortized Cost	2,048
Investment securities held-to-maturity, Due after ten years through thirty years, Amortized Cost	129,930
Investment securities held-to-maturity, Mortgage backed securities, Amortized Cost	87,872
Amortized Cost	$ 219,850	$ 232,399

Investment Securities Held to_4

Investment Securities Held to Maturity - Investments Gross Unrecognized Losses and Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	$ 80,453	$ 70,616
Less than 12 months, Unrecognized Losses	2,482	637
12 months or more, Fair Value	98,882	79,668
12 months or more, Unrealized Losses	6,516	1,928
Total, Fair Value	179,335	150,284
Total, Unrecognized Losses	8,998	2,565
Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	22,791	57,266
Less than 12 months, Unrecognized Losses	924	451
12 months or more, Fair Value	61,454	41,705
12 months or more, Unrealized Losses	2,703	617
Total, Fair Value	84,245	98,971
Total, Unrecognized Losses	3,627	1,068
Municipal Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	57,662	13,350
Less than 12 months, Unrecognized Losses	1,558	186
12 months or more, Fair Value	37,428	37,963
12 months or more, Unrealized Losses	3,813	1,311
Total, Fair Value	95,090	51,313
Total, Unrecognized Losses	$ 5,371	$ 1,497

Loans - Summary of Information

Loans - Summary of Information Concerning Loan Portfolio by Collateral Types (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Receivables with Imputed Interest [Line Items]
Total loans excluding purchased credit impaired loans	$ 8,055,421	$ 4,609,063
Total PCI loans	167,671	164,158
Total loans	8,223,092	4,773,221
Allowance for loan losses for loans that are not PCI loans	(38,595)	(32,530)
Net Loans	8,184,281	4,740,396
Allowance for loan losses for loans that are not PCI loans [Member]
Receivables with Imputed Interest [Line Items]
Real estate loans, Residential	1,713,093	1,025,303
Real estate loans, Commercial	4,395,351	2,546,143
Land, development and construction	645,885	235,816
Total real estate	6,754,329	3,807,262
Commercial	1,104,392	693,501
Consumer and other loans	194,603	107,480
Loans before unearned fees and deferred cost	8,053,324	4,608,243
Net unearned fees and costs	2,097	820
Allowance for loan losses on PCI loans [Member]
Receivables with Imputed Interest [Line Items]
Real estate loans, Residential	62,507	59,975
Real estate loans, Commercial	92,444	92,791
Land, development and construction	6,955	6,656
Total real estate	161,906	159,422
Commercial	5,479	4,444
Consumer and other loans	286	292
Allowance for loan losses for PCI loans	$ (216)	$ (295)

Loans - Summary of Allowance fo

Loans - Summary of Allowance for Loan Losses and Recorded Investment in Loans by Portfolios (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 37,484	$ 30,132	$ 32,825	$ 27,041
Loans charged-off	(1,178)	(472)	(2,170)	(1,722)
Recoveries of loans previously charged-off	555	1,072	1,973	2,519
Net (charge-offs) recoveries	(623)	600	(197)	797
Provision for loan losses	1,950	1,096	6,183	3,990
Balance at end of period	38,811	31,828	38,811	31,828
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period			6,003
Balance at end of period	5,852		5,852
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period			19,363
Balance at end of period	22,950		22,950
Land, Development, Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period			1,401
Balance at end of period	1,792		1,792
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period			4,130
Balance at end of period	5,641		5,641
Consumer and Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period			1,928
Balance at end of period	2,576		2,576
Allowance for loan losses for loans that are not PCI loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	37,209	29,769	32,530	26,569
Loans charged-off	(1,178)	(472)	(2,170)	(1,722)
Recoveries of loans previously charged-off	555	1,072	1,898	2,454
Net (charge-offs) recoveries	(623)	600	(272)	732
Provision for loan losses	2,009	1,174	6,337	4,242
Balance at end of period	38,595	31,543	38,595	31,543
Allowance for loan losses for loans that are not PCI loans [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	5,847	6,134	6,003	5,640
Loans charged-off	(283)	(108)	(419)	(250)
Recoveries of loans previously charged-off	217	290	855	816
Provision for loan losses	71	(292)	(587)	(182)
Balance at end of period	5,852	6,024	5,852	6,024
Allowance for loan losses for loans that are not PCI loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	21,921	17,238	19,304	14,713
Loans charged-off		(8)		(72)
Recoveries of loans previously charged-off	113	320	569	626
Provision for loan losses	916	1,074	3,077	3,357
Balance at end of period	22,950	18,624	22,950	18,624
Allowance for loan losses for loans that are not PCI loans [Member] | Land, Development, Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	1,629	1,175	1,179	883
Loans charged-off	(62)		(62)
Recoveries of loans previously charged-off	2	353	3	596
Provision for loan losses	21	(393)	470	(344)
Balance at end of period	1,590	1,135	1,590	1,135
Allowance for loan losses for loans that are not PCI loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	5,412	3,590	4,130	3,785
Loans charged-off	(327)	(140)	(555)	(677)
Recoveries of loans previously charged-off	152	82	214	254
Provision for loan losses	404	458	1,852	628
Balance at end of period	5,641	3,990	5,641	3,990
Allowance for loan losses for loans that are not PCI loans [Member] | Consumer and Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	2,400	1,632	1,914	1,548
Loans charged-off	(506)	(216)	(1,134)	(723)
Recoveries of loans previously charged-off	71	27	257	162
Provision for loan losses	597	327	1,525	783
Balance at end of period	2,562	1,770	2,562	1,770
Allowance for loan losses on PCI loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	275	363	295	472
Recoveries of loans previously charged-off			75	65
Net (charge-offs) recoveries			75	65
Provision for loan losses	(59)	(78)	(154)	(252)
Balance at end of period	216	285	216	285
Allowance for loan losses on PCI loans [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		50		54
Provision for loan losses		(50)		(54)
Allowance for loan losses on PCI loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	59	123	59	92
Recoveries of loans previously charged-off				65
Provision for loan losses	(59)	(65)	(59)	(99)
Balance at end of period		58		58
Allowance for loan losses on PCI loans [Member] | Land, Development, Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	202	176	222	312
Provision for loan losses		37	(20)	(99)
Balance at end of period	202	213	202	213
Allowance for loan losses on PCI loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recoveries of loans previously charged-off			75
Provision for loan losses			(75)
Allowance for loan losses on PCI loans [Member] | Consumer and Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	14	14	14	14
Balance at end of period	$ 14	$ 14	$ 14	$ 14

Loans - Allowance for Loan Loss

Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Allowance for loan losses:
Individually evaluated for impairment	$ 1,413		$ 804
Collectively evaluated for impairment	37,182		31,726
Purchased credit impaired	216		295
Total ending allowance balance	38,811	$ 37,484	32,825	$ 31,828	$ 30,132	$ 27,041
Loans:
Individually evaluated for impairment	17,168		20,345
Collectively evaluated for impairment	8,036,156		4,587,898
Purchased credit impaired	167,671		164,158
Total ending loan balances	8,220,995		4,772,401
Residential Real Estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	417		586
Collectively evaluated for impairment	5,435		5,417
Total ending allowance balance	5,852		6,003
Loans:
Individually evaluated for impairment	7,055		8,101
Collectively evaluated for impairment	1,706,038		1,017,202
Purchased credit impaired	62,507		59,975
Total ending loan balances	1,775,600		1,085,278
Commercial Real Estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	445
Collectively evaluated for impairment	22,505		19,304
Purchased credit impaired			59
Total ending allowance balance	22,950		19,363
Loans:
Individually evaluated for impairment	7,686		8,218
Collectively evaluated for impairment	4,387,665		2,537,925
Purchased credit impaired	92,444		92,791
Total ending loan balances	4,487,795		2,638,934
Land, Development, Construction [Member]
Allowance for loan losses:
Individually evaluated for impairment			4
Collectively evaluated for impairment	1,590		1,175
Purchased credit impaired	202		222
Total ending allowance balance	1,792		1,401
Loans:
Individually evaluated for impairment	971		331
Collectively evaluated for impairment	644,914		235,485
Purchased credit impaired	6,955		6,656
Total ending loan balances	652,840		242,472
Commercial and Industrial [Member]
Allowance for loan losses:
Individually evaluated for impairment	546		206
Collectively evaluated for impairment	5,095		3,924
Total ending allowance balance	5,641		4,130
Loans:
Individually evaluated for impairment	1,292		3,497
Collectively evaluated for impairment	1,103,100		690,004
Purchased credit impaired	5,479		4,444
Total ending loan balances	1,109,871		697,945
Consumer and Other [Member]
Allowance for loan losses:
Individually evaluated for impairment	5		8
Collectively evaluated for impairment	2,557		1,906
Purchased credit impaired	14		14
Total ending allowance balance	2,576		1,928
Loans:
Individually evaluated for impairment	164		198
Collectively evaluated for impairment	194,439		107,282
Purchased credit impaired	286		292
Total ending loan balances	$ 194,889		$ 107,772

Loans - Summary of Impaired Loa

Loans - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Mortgage Loans On Real Estate [Line Items]
Total TDRs (these are included in impaired loans)	$ 10,488	$ 12,779
Impaired loans that are not TDRs	6,680	7,566
Total impaired loans	17,168	20,345
Performing TDRs [Member]
Mortgage Loans On Real Estate [Line Items]
Total TDRs (these are included in impaired loans)	9,204	12,081
Nonperforming TDRs [Member]
Mortgage Loans On Real Estate [Line Items]
Total TDRs (these are included in impaired loans)	$ 1,284	$ 698

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Receivables [Abstract]
Loans modification, modified terms allowance period minimum			12 months
Loans modification, modified terms allowance period maximum			24 months
Provision for loan loss expense	$ 54	$ 20	$ 82	$ 264
Partial charge offs for troubled debt restructured	11	13	$ 32	55
Percentage of troubled debt restructured current pursuant to modified terms			88.00%
Non performing TDRs	1,284		$ 1,284
Percentage of troubled debt restructured not performing pursuant to their modified terms			12.00%
Loans modified as TDRs	616	85	$ 1,838	784
Loan loss provision modified as TDRs	16	0	33	8
Provision for loan loss expense within twelve months	18	8	24	24
Partial charge offs for troubled debt restructured	5	8	10	24
Reclassification from non-accretable difference	$ 4,529	$ 2,286	$ 8,443	$ 8,364

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructured Loans by Loans Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
TDRs	$ 10,488	$ 12,779
Total Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
TDRs	9,719	12,025
Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	9,204	12,081
Accruing [Member] | Total Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
TDRs	8,461	11,355
Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs	1,284	698
Non Accrual [Member] | Total Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
TDRs	1,258	670
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs	7,055	8,101
Residential Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	6,525	7,737
Residential Real Estate [Member] | Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs	530	364
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs	2,542	3,592
Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	1,855	3,286
Commercial Real Estate [Member] | Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs	687	306
Land, Development, Construction [Member]
Financing Receivable, Modifications [Line Items]
TDRs	122	332
Land, Development, Construction [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	81	332
Land, Development, Construction [Member] | Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs	41
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
TDRs	605	556
Commercial and Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	605	556
Consumer and Other [Member]
Financing Receivable, Modifications [Line Items]
TDRs	164	198
Consumer and Other [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	138	170
Consumer and Other [Member] | Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs	$ 26	$ 28

Loans - Summary of Loans by Cla

Loans - Summary of Loans by Class Modified (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)SecurityLoan	Sep. 30, 2017USD ($)SecurityLoan
Mortgage Loans On Real Estate [Line Items]
Number of loans | SecurityLoan	2	3
Recorded investment | $	$ 307	$ 688
Residential Real Estate [Member]
Mortgage Loans On Real Estate [Line Items]
Number of loans | SecurityLoan	1	1
Recorded investment | $	$ 191	$ 72
Commercial Real Estate [Member]
Mortgage Loans On Real Estate [Line Items]
Number of loans | SecurityLoan	1	2
Recorded investment | $	$ 116	$ 616

Loans - Summary of Loans Indivi

Loans - Summary of Loans Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 18,073	$ 21,869
Total impaired loans	17,168	20,345
Amount of allowance for loan losses allocated to impaired loans	1,413	804
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	4,105	4,945
Unpaid principal balance, With an allowance recorded	3,235	3,426
Recorded investment, With no related allowance	3,977	4,818
Recorded investment, With an allowance recorded	3,078	3,283
Total impaired loans	7,055	8,101
Amount of allowance for loan losses allocated to impaired loans	417	586
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	6,634	8,973
Unpaid principal balance, With an allowance recorded	1,600
Recorded investment, With no related allowance	6,090	8,218
Recorded investment, With an allowance recorded	1,596
Total impaired loans	7,686	8,218
Amount of allowance for loan losses allocated to impaired loans	445
Land, Development, Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	1,009	260
Unpaid principal balance, With an allowance recorded		140
Recorded investment, With no related allowance	971	210
Recorded investment, With an allowance recorded		121
Total impaired loans	971	331
Amount of allowance for loan losses allocated to impaired loans		4
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	427	3,374
Unpaid principal balance, With an allowance recorded	880	531
Recorded investment, With no related allowance	416	2,968
Recorded investment, With an allowance recorded	876	529
Total impaired loans	1,292	3,497
Amount of allowance for loan losses allocated to impaired loans	546	206
Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	111	142
Unpaid principal balance, With an allowance recorded	72	78
Recorded investment, With no related allowance	111	127
Recorded investment, With an allowance recorded	53	71
Total impaired loans	164	198
Amount of allowance for loan losses allocated to impaired loans	$ 5	$ 8

Loans - Summary of Impairment b

Loans - Summary of Impairment by Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	$ 17,724	$ 19,200	$ 18,810	$ 19,158
Interest income recognized during impairment	117	120	346	354
Total Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	15,963	17,079	18,216	17,211
Interest income recognized during impairment	106	110	335	324
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	7,328	7,536	15,306	7,767
Interest income recognized during impairment	79	70	308	207
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	7,674	9,200	2,586	8,979
Interest income recognized during impairment	25	35	25	104
Land, Development, Construction [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	961	343	324	465
Interest income recognized during impairment	2	5	2	13
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	1,596	1,859	538	1,702
Interest income recognized during impairment	9	7	9	22
Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	165	262	56	245
Interest income recognized during impairment	$ 2	$ 3	$ 2	$ 8

Loans - Summary of Nonperformin

Loans - Summary of Nonperforming Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Non accrual loans	$ 23,450	$ 17,288
Loans past due over 90 days and still accruing interest	0	0
Total non performing loans	$ 23,450	$ 17,288

Loans - Summary of Recorded Inv

Loans - Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due Over 90 Days Still on Accrual by Class of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 23,450	$ 17,288
Loans past due over 90 days still accruing	0	0
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	9,234	7,107
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	9,108	6,549
Land, Development, Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,441	138
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,237	3,121
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 430	$ 373

Loans - Summary Aging of Record

Loans - Summary Aging of Recorded Investment in Past Due Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 8,053,324	$ 4,608,243
Total Past Due	28,390	13,665
Loans Not Past Due	8,001,484	4,577,290
Non accrual loans	23,450	17,288
30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	16,619	8,572
60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,771	5,093
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,713,093	1,025,303
Total Past Due	8,188	5,389
Loans Not Past Due	1,695,671	1,012,807
Non accrual loans	9,234	7,107
Residential Real Estate [Member] | 30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,011	3,568
Residential Real Estate [Member] | 60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,177	1,821
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	4,395,351	2,546,143
Total Past Due	14,463	3,430
Loans Not Past Due	4,371,780	2,536,164
Non accrual loans	9,108	6,549
Commercial Real Estate [Member] | 30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,556	1,158
Commercial Real Estate [Member] | 60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,907	2,272
Land, Development, Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	645,885	235,816
Total Past Due	1,322	2,996
Loans Not Past Due	642,122	232,682
Non accrual loans	2,441	138
Land, Development, Construction [Member] | 30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	796	2,807
Land, Development, Construction [Member] | 60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	526	189
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,104,392	693,501
Total Past Due	3,297	1,331
Loans Not Past Due	1,098,858	689,049
Non accrual loans	2,237	3,121
Commercial and Industrial [Member] | 30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,327	568
Commercial and Industrial [Member] | 60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	970	763
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	194,603	107,480
Total Past Due	1,120	519
Loans Not Past Due	193,053	106,588
Non accrual loans	430	373
Consumer and Other [Member] | 30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	929	471
Consumer and Other [Member] | 60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 191	$ 48

Loans - Risk Category of Loans

Loans - Risk Category of Loans by Class of Loans, Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,713,093	$ 1,025,303
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	194,603	107,480
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	7,695,117	4,397,611
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,639,770	987,472
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,181,026	2,411,085
Pass [Member] | Land, Development, Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	604,023	217,555
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,076,627	674,764
Pass [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	193,671	106,735
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	275,071	168,401
Special Mention [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	46,373	20,435
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	167,606	115,942
Special Mention [Member] | Land, Development, Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	36,933	17,699
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	23,896	14,186
Special Mention [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	263	139
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	83,136	42,231
Substandard [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	26,950	17,396
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	46,719	19,116
Substandard [Member] | Land, Development, Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,929	562
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,869	4,551
Substandard [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 669	$ 606

Loans - Investment in Residenti

Loans - Investment in Residential and Consumer Loans, Excluding Loans from Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,713,093	$ 1,025,303
Residential Real Estate [Member] | Performing TDRs [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,703,859	1,018,196
Residential Real Estate [Member] | Nonperforming TDRs [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	9,234	7,107
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	194,603	107,480
Consumer and Other [Member] | Performing TDRs [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	194,173	107,107
Consumer and Other [Member] | Nonperforming TDRs [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 430	$ 373

Loans - Summary of Total Contra

Loans - Summary of Total Contractually Required Principal and Interest Cash Payments, Management's Estimate of Expected Total Cash Payments and Carrying Value of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Contractually required principal and interest	$ 294,278	$ 248,283
Non-accretable difference	(59,433)	(13,183)
Cash flows expected to be collected	234,845	235,100
Accretable yield	(67,174)	(70,942)
Carrying value of acquired loans	167,671	164,158
Allowance for loan losses	(216)	(295)
Carrying value less allowance for loan losses	$ 167,455	$ 163,863

Loans - Summary of Changes in T

Loans - Summary of Changes in Total Contractually Required Principal and Interest Cash Payments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Contractually required principal and interest, beginning balance			$ 248,283
Non-accretable difference, beginning balance			(13,183)
Cash flows expected to be collected, beginning balance			235,100
Accretable yield, beginning balance			(70,942)
Carrying value of acquired loans, beginning balance			164,158
Contractually required principal and interest, ending balance	$ 294,278		294,278
Non-accretable difference, ending balance	(59,433)		(59,433)
Cash flows expected to be collected, ending balance	234,845		234,845
Accretable yield, ending balance	(67,174)		(67,174)
Carrying value of acquired loans, ending balance	167,671		167,671
Contractually Required Principal and Interest [Member]
Financing Receivable, Recorded Investment [Line Items]
Contractually required principal and interest, beginning balance	285,576	$ 280,114	248,283	$ 297,821
Effect of acquisitions	33,687		122,392	20,729
All other adjustments	(24,985)	(21,776)	(76,397)	(60,212)
Contractually required principal and interest, ending balance	294,278	258,338	294,278	258,338
Non-Accretable Difference [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-accretable difference, beginning balance	(44,166)	(14,047)	(13,183)	(18,372)
Effect of acquisitions	(20,763)		(58,927)	(6,347)
All other adjustments	5,496	1,148	12,677	11,820
Non-accretable difference, ending balance	(59,433)	(12,899)	(59,433)	(12,899)
Cash Flows Expected to be Collected [Member]
Financing Receivable, Recorded Investment [Line Items]
Cash flows expected to be collected, beginning balance	241,410	266,067	235,100	279,449
Effect of acquisitions	12,924		63,465	14,382
All other adjustments	(19,489)	(20,628)	(63,720)	(48,392)
Cash flows expected to be collected, ending balance	234,845	245,439	234,845	245,439
Accretable Yield [Member]
Financing Receivable, Recorded Investment [Line Items]
Accretable yield, beginning balance	(67,460)	(86,703)	(70,942)	(93,525)
Effect of acquisitions	(1,492)		(7,770)	(3,266)
Income accretion	7,682	7,696	26,496	24,780
All other adjustments	(5,904)	(2,457)	(14,958)	(9,453)
Accretable yield, ending balance	(67,174)	(81,464)	(67,174)	(81,464)
Carry Value of Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Carrying value of acquired loans, beginning balance	173,950	179,364	164,158	185,924
Effect of acquisitions	11,432		55,695	11,116
Income accretion	7,682	7,696	26,496	24,780
All other adjustments	(25,393)	(23,085)	(78,678)	(57,845)
Carrying value of acquired loans, ending balance	$ 167,671	$ 163,975	$ 167,671	$ 163,975

Loans Held for Sale - Additiona

Loans Held for Sale - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2018USD ($)
Loans Receivable Held For Sale Net [Abstract]
Net gains from changes in estimated fair value of mortgage loans held for sale	$ 1,000	$ 723,000
Loans held for sale, past due	0	0
Loans held for sale, on nonaccrual	$ 0	$ 0

Loans Held for Sale - Summary o

Loans Held for Sale - Summary of Activity in Mortgage Loans Held for Sale (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Loans Receivable Held For Sale Net [Abstract]
Beginning balance	$ 36,366	$ 8,959	$ 19,647	$ 2,285
Effect from acquisitions	2,835		8,959
Loans originated	91,910	23,444	242,226	53,806
Proceeds from sales	(94,226)	(20,564)	(238,613)	(44,780)
Change in fair value	1		723
Net realized gain on sales	2,668	404	6,612	932
Ending balance	$ 39,554	$ 12,243	$ 39,554	$ 12,243

Loans Held for Sale - Schedule

Loans Held for Sale - Schedule of Summarizes The Notional Amounts For Interest Rate Lock Commitments And Best Efforts Forward Trades and MBS Forward Trades Pertaining To Loans Held For Sale (Detail) - Loans Held for Sale [Member] $ in Thousands	Sep. 30, 2018USD ($)
Loans Held For Sale [Line Items]
Total derivative instruments	$ 169,236
Interest Rate Lock Commitments [Member]
Loans Held For Sale [Line Items]
Total derivative instruments	75,811
Best Efforts Forward Trades [Member]
Loans Held For Sale [Line Items]
Total derivative instruments	66,425
MBS Forward Trades [Member]
Loans Held For Sale [Line Items]
Total derivative instruments	$ 27,000

Securities Sold Under Agreeme_3

Securities Sold Under Agreement to Repurchase - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Banking And Thrift [Abstract]
Securities sold under agreement to repurchase	$ 51,311	$ 52,080

Securities Sold Under Agreeme_4

Securities Sold Under Agreement to Repurchase - Summary of Repurchase Agreement (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets Sold Under Agreements To Repurchase [Line Items]
Market value of securities pledged	$ 67,283	$ 59,682
Securities sold under agreement to repurchase	$ 51,311	$ 52,080
Market value pledged as a % of borrowings	131.00%	115.00%
Mortgage Backed Securities [Member]
Assets Sold Under Agreements To Repurchase [Line Items]
Market value of securities pledged	$ 66,849	$ 59,239
Securities sold under agreement to repurchase	$ 51,195	$ 52,030
Market value pledged as a % of borrowings	131.00%	114.00%
Municipal Securities [Member]
Assets Sold Under Agreements To Repurchase [Line Items]
Market value of securities pledged	$ 434	$ 443
Securities sold under agreement to repurchase	$ 116	$ 50
Market value pledged as a % of borrowings	374.00%	886.00%

Business Combinations - Additio

Business Combinations - Additional Information (Detail) $ / shares in Units, $ in Thousands	Sep. 01, 2018USD ($)$ / shares	Jan. 01, 2018USD ($)$ / shares	May 01, 2017USD ($)$ / shares	Apr. 01, 2017USD ($)$ / shares	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill on the acquisition					$ 802,880		$ 802,880		$ 257,683
Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Effective date of acquisition							Apr. 1, 2017
Increase in total assets				14.00%
Increase in total deposits				13.00%
Merger and acquisition related expenses					0	$ 0	$ 0	$ 3,927
Goodwill on the acquisition				$ 73,829
Multiplied by the cash consideration each Platinum share is entitled to receive | $ / shares				$ 7.60
Per share exchange ratio				3.7832
Total purchase consideration				$ 119,431
Loans at fair value				454,584
Estimated discount on loans acquired				$ 8,980
Estimated discount to outstanding principal balance				1.90%
Percentage of loan acquired										13.30%
Platinum Bank Holding Company [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Deposit intangible asset				$ 3,992
Platinum Bank Holding Company [Member] | Core Deposits [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated economic life							10 years
Platinum Bank Holding Company [Member] | Purchased Credit-Impaired [Member]
Business Acquisition [Line Items]
Loans with credit deficiencies				$ 12,218
Platinum Bank Holding Company [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Percentage of outstanding stock acquired				100.00%
Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Effective date of acquisition							May 1, 2017
Increase in total assets			19.00%
Increase in total deposits			17.00%
Merger and acquisition related expenses					0	0	$ 149	6,401
Goodwill on the acquisition			$ 77,826
Multiplied by the cash consideration each Platinum share is entitled to receive | $ / shares			$ 18
Per share exchange ratio			0.95
Total purchase consideration			$ 157,372
Loans at fair value			568,240
Estimated discount on loans acquired			$ 9,479
Estimated discount to outstanding principal balance			1.60%
Percentage of loan acquired										16.60%
Gateway Financial Holdings Of Florida Inc [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Deposit intangible asset			$ 8,432
Gateway Financial Holdings Of Florida Inc [Member] | Core Deposits [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated economic life							10 years
Gateway Financial Holdings Of Florida Inc [Member] | Purchased Credit-Impaired [Member]
Business Acquisition [Line Items]
Loans with credit deficiencies			$ 7,827
Gateway Financial Holdings Of Florida Inc [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Percentage of outstanding stock acquired			100.00%
Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Effective date of acquisition							Jan. 1, 2018
Increase in total assets		14.00%
Increase in total deposits		13.00%
Merger and acquisition related expenses					0		$ 10,474
Goodwill on the acquisition		$ 114,228
Per share exchange ratio		0.89
Total purchase consideration		$ 187,852
Loans at fair value		684,322
Estimated discount on loans acquired		$ 22,657
Estimated discount to outstanding principal balance		3.20%
Percentage of loan acquired									14.30%
Goodwill, period decrease					4,114		4,114
Income tax expense, related to goodwill					1,397		$ 1,397
Determination period for fair value estimates		1 year
Sunshine Bancorp, Inc. [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Deposit intangible asset		$ 8,525
Sunshine Bancorp, Inc. [Member] | Core Deposits [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated economic life							10 years
Sunshine Bancorp, Inc. [Member] | Purchased Credit-Impaired [Member]
Business Acquisition [Line Items]
Loans with credit deficiencies		$ 8,232
Sunshine Bancorp, Inc. [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Percentage of outstanding stock acquired		100.00%
HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Effective date of acquisition							Jan. 1, 2018
Increase in total assets		33.00%
Increase in total deposits		32.00%
Merger and acquisition related expenses					0	$ 11,527	$ 0	$ 11,527
Goodwill on the acquisition		$ 233,321
Multiplied by the cash consideration each Platinum share is entitled to receive | $ / shares		$ 1.925
Per share exchange ratio		0.675
Total purchase consideration		$ 448,236
Loans at fair value		1,326,035
Estimated discount on loans acquired		$ 40,438
Estimated discount to outstanding principal balance		3.00%
Percentage of loan acquired									27.80%
Determination period for fair value estimates		1 year
HCBF Holding Company, Inc. [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Deposit intangible asset		$ 23,625
HCBF Holding Company, Inc. [Member] | Core Deposits [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated economic life							10 years
HCBF Holding Company, Inc. [Member] | Purchased Credit-Impaired [Member]
Business Acquisition [Line Items]
Loans with credit deficiencies		$ 36,031
HCBF Holding Company, Inc. [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Percentage of outstanding stock acquired		100.00%
Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Effective date of acquisition							Sep. 1, 2018
Increase in total assets	24.00%
Increase in total deposits	24.00%
Merger and acquisition related expenses					$ 10,395		$ 10,630
Goodwill on the acquisition	$ 197,648
Multiplied by the cash consideration each Platinum share is entitled to receive | $ / shares	$ 2.30
Per share exchange ratio	0.738
Total purchase consideration	$ 389,476
Loans at fair value	1,141,672
Estimated discount on loans acquired	$ 23,118
Estimated discount to outstanding principal balance	2.00%
Percentage of loan acquired									23.90%
Determination period for fair value estimates	1 year
Charter Financial Corporation [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Deposit intangible asset	$ 19,795
Charter Financial Corporation [Member] | Core Deposits [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated economic life							10 years
Charter Financial Corporation [Member] | Purchased Credit-Impaired [Member]
Business Acquisition [Line Items]
Loans with credit deficiencies	$ 11,432
Charter Financial Corporation [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Percentage of outstanding stock acquired	100.00%

Business Combinations - Summary

Business Combinations - Summary of Purchase Price Calculation (Detail) $ / shares in Units, $ in Thousands	Sep. 01, 2018USD ($)$ / sharesshares	Jan. 01, 2018USD ($)$ / sharesshares	May 01, 2017USD ($)$ / sharesshares	Apr. 01, 2017USD ($)$ / sharesshares
Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Number of shares of common stock outstanding | shares				1,131,134
Per share exchange ratio				3.7832
Number of shares of CenterState common stock less fractional shares | shares				4,279,255
Multiplied by CenterState common stock price per share | $ / shares				$ 25.90
Fair value of CenterState common stock issued				$ 110,833
Multiplied by the cash consideration each share is entitled to receive | $ / shares				$ 7.60
Total cash consideration, not including cash for fractional shares				$ 8,597
Total cash consideration				8,598
Total purchase price				$ 119,431
Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Number of shares of common stock outstanding | shares			5,463,764
Preferred shares that converted to common shares upon a change in control | shares			919,236
Total common shares including conversion of preferred shares | shares			6,383,000
Number of shares of common shares exchanged for CenterState common stock | shares			4,468,100
Per share exchange ratio			0.95
Number of shares of CenterState common stock less fractional shares | shares			4,244,441
Multiplied by CenterState common stock price per share | $ / shares			$ 25.23
Fair value of CenterState common stock issued			$ 107,087
Number of shares of Gateway common shares exchanged for cash | shares			1,914,900
Multiplied by the cash consideration each share is entitled to receive | $ / shares			$ 18
Total cash consideration, not including cash for fractional shares			$ 34,468
Total cash consideration			34,474
Total consideration paid to common shareholders			141,561
Fair value of stock options converted to CenterState stock options			15,811
Total purchase price			$ 157,372
Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Number of shares of common stock outstanding | shares		7,922,479
Per share exchange ratio		0.89
Number of shares of CenterState common stock less fractional shares | shares		7,050,645
Multiplied by CenterState common stock price per share | $ / shares		$ 25.73
Fair value of CenterState common stock issued		$ 181,413
Total cash consideration		7
Total consideration paid to common shareholders		181,420
Fair value of stock options converted to CenterState stock options		6,432
Total purchase price		$ 187,852
HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Number of shares of common stock outstanding | shares		22,299,082
Per share exchange ratio		0.675
Number of shares of CenterState common stock less fractional shares | shares		15,051,639
Multiplied by CenterState common stock price per share | $ / shares		$ 25.73
Fair value of CenterState common stock issued		$ 387,279
Multiplied by the cash consideration each share is entitled to receive | $ / shares		$ 1.925
Total cash consideration, not including cash for fractional shares		$ 42,932
Total cash consideration		42,932
Total consideration paid to common shareholders		430,211
Fair value of stock options converted to CenterState stock options		18,025
Total purchase price		$ 448,236
Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Number of shares of common stock outstanding | shares	15,480,776
Per share exchange ratio	0.738
Number of shares of CenterState common stock less fractional shares | shares	11,424,214
Multiplied by CenterState common stock price per share | $ / shares	$ 30.62
Fair value of CenterState common stock issued	$ 349,809
Multiplied by the cash consideration each share is entitled to receive | $ / shares	$ 2.30
Total cash consideration, not including cash for fractional shares	$ 35,624
Total cash consideration	35,624
Total consideration paid to common shareholders	385,433
Cash out of Charter stock options	4,043
Total purchase price	$ 389,476

Business Combinations - Summa_2

Business Combinations - Summary of Purchase Price Calculation (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 01, 2018	Jan. 01, 2018	May 01, 2017	Apr. 01, 2017
Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Fractional shares				51
Fractional shares amount				$ 1
Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Fractional shares			254
Fractional shares amount			$ 6
Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Fractional shares		361
HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Fractional shares		241
Fractional shares amount		$ 6
Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Fractional shares	599
Fractional shares amount	$ 17

Business Combinations - Summa_3

Business Combinations - Summary of Fair Value of Assets Purchased, Including Goodwill and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 01, 2018	Jan. 01, 2018	Dec. 31, 2017	May 01, 2017	Apr. 01, 2017
Assets:
Goodwill	$ 802,880			$ 257,683
Platinum Bank Holding Company [Member]
Assets:
Cash and cash equivalents						$ 106,537
Loans, held for investment						442,366
Purchased credit impaired loans						12,218
Investments						28,873
Accrued interest receivable						1,216
Branch real estate						9,600
Furniture and fixtures						402
Bank property held for sale						4,382
FHLB stock						2,220
Other repossessed real estate owned						272
Core deposit intangible						3,992
Goodwill						73,829
Deferred tax asset						227
Other assets						29
Total assets acquired						686,163
Liabilities:
Deposits						520,423
Federal Home Loan Bank advances						40,546
Securities sold under agreement to repurchase						5,569
Accrued interest payable						94
Other liabilities						100
Total liabilities assumed						$ 566,732
Gateway Financial Holdings Of Florida Inc [Member]
Assets:
Cash and cash equivalents					$ 23,065
Loans, held for investment					560,413
Purchased credit impaired loans					7,827
Investments					231,951
Accrued interest receivable					2,422
Branch real estate					18,160
Furniture and fixtures					702
Bank property held for sale					1,087
Federal Reserve Bank and Federal Home Loan Bank stock					4,640
Other repossessed real estate owned					134
Bank owned life insurance					15,475
Servicing asset intangible					271
Core deposit intangible					8,432
Goodwill					77,826
Deferred tax asset					7,246
Other assets					1,217
Total assets acquired					960,868
Liabilities:
Deposits					708,209
Federal Home Loan Bank advances					90,598
Federal funds purchased					3,588
Accrued interest payable					304
Other liabilities					797
Total liabilities assumed					$ 803,496
Sunshine Bancorp, Inc. [Member]
Assets:
Cash and cash equivalents			$ 47,056
Loans, held for investment			676,090
Purchased credit impaired loans			8,232
Loans held for sale			430
Investments			93,006
Accrued interest receivable			2,170
Branch real estate			9,375
Furniture and fixtures			916
Bank property held for sale			9,503
Federal Reserve Bank and Federal Home Loan Bank stock			4,875
Bank owned life insurance			23,101
Core deposit intangible			8,525
Goodwill			114,228
Deferred tax asset			11,670
Other assets			6,135
Total assets acquired			1,015,312
Liabilities:
Deposits			719,039
Federal Home Loan Bank advances			95,001
Securities sold under agreement to repurchase			353
Subordinated notes			11,000
Accrued interest payable			457
Other liabilities			1,610
Total liabilities assumed			827,460
HCBF Holding Company, Inc. [Member]
Assets:
Cash and cash equivalents			77,176
Loans, held for investment			1,290,004
Purchased credit impaired loans			36,031
Loans held for sale			5,694
Investments			585,297
Accrued interest receivable			5,847
Branch real estate			34,035
Furniture and fixtures			3,571
Bank property held for sale			14,140
FHLB and other stock			9,488
Other repossessed real estate owned			5,144
Bank owned life insurance			39,089
Core deposit intangible			23,625
Goodwill			233,321
Deferred tax asset			14,071
Other assets			2,536
Total assets acquired			2,379,069
Liabilities:
Deposits			1,755,155
Federal Home Loan Bank advances			157,919
Corporate debentures			5,872
Accrued interest payable			478
Other liabilities			11,409
Total liabilities assumed			$ 1,930,833
Charter Financial Corporation [Member]
Assets:
Cash and cash equivalents		$ 184,020
Loans, held for investment		1,130,240
Purchased credit impaired loans		11,432
Loans held for sale		2,835
Investments		73,808
Accrued interest receivable		3,684
Branch real estate		27,930
Furniture and fixtures		1,988
Bank property held for sale		1,695
FHLB and other stock		1,483
Other repossessed real estate owned		257
Bank owned life insurance		54,813
Core deposit intangible		19,795
Goodwill		197,648
Deferred tax asset		1,966
Other assets		20,947
Total assets acquired		1,734,541
Liabilities:
Deposits		1,321,970
Corporate debentures		9,000
Accrued interest payable		1,015
Other liabilities		13,080
Total liabilities assumed		$ 1,345,065

Business Combinations - Summa_4

Business Combinations - Summary of Contractually Required Principal and Interest Cash Payments for Purchased Credit Impaired Loans (Detail) - Purchased Credit-Impaired [Member] - USD ($) $ in Thousands	Sep. 01, 2018	Jan. 01, 2018	May 01, 2017	Apr. 01, 2017
Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Contractually required principal and interest				$ 18,811
Non-accretable difference				(4,639)
Cash flows expected to be collected				14,172
Accretable yield				(1,954)
Total purchased credit-impaired loans acquired				$ 12,218
Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Contractually required principal and interest			$ 12,523
Non-accretable difference			(2,465)
Cash flows expected to be collected			10,058
Accretable yield			(2,231)
Total purchased credit-impaired loans acquired			$ 7,827
Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Contractually required principal and interest		$ 21,598
Non-accretable difference		(12,213)
Cash flows expected to be collected		9,385
Accretable yield		(1,153)
Total purchased credit-impaired loans acquired		8,232
HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Contractually required principal and interest		67,107
Non-accretable difference		(25,951)
Cash flows expected to be collected		41,156
Accretable yield		(5,125)
Total purchased credit-impaired loans acquired		$ 36,031
Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Contractually required principal and interest	$ 33,687
Non-accretable difference	(20,763)
Cash flows expected to be collected	12,924
Accretable yield	(1,492)
Total purchased credit-impaired loans acquired	$ 11,432

Business Combinations - Summa_5

Business Combinations - Summary of Fair Value of Acquired Loans and Unpaid Principal Balance (Detail) - USD ($) $ in Thousands	Sep. 01, 2018	Jan. 01, 2018	May 01, 2017	Apr. 01, 2017
Book Balance [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				$ 463,564
Book Balance [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			$ 577,719
Book Balance [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		$ 706,979
Book Balance [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		1,366,473
Book Balance [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	$ 1,164,790
Book Balance [Member] | Residential Real Estate [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				37,206
Book Balance [Member] | Residential Real Estate [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			142,881
Book Balance [Member] | Residential Real Estate [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		148,342
Book Balance [Member] | Residential Real Estate [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		370,611
Book Balance [Member] | Residential Real Estate [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	284,505
Book Balance [Member] | Commercial Real Estate [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				262,612
Book Balance [Member] | Commercial Real Estate [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			321,262
Book Balance [Member] | Commercial Real Estate [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		375,377
Book Balance [Member] | Commercial Real Estate [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		636,517
Book Balance [Member] | Commercial Real Estate [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	567,506
Book Balance [Member] | Land, Development, Construction [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				47,675
Book Balance [Member] | Land, Development, Construction [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			47,727
Book Balance [Member] | Land, Development, Construction [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		58,530
Book Balance [Member] | Land, Development, Construction [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		149,547
Book Balance [Member] | Land, Development, Construction [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	181,128
Book Balance [Member] | Commercial and Industrial [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				96,587
Book Balance [Member] | Commercial and Industrial [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			46,953
Book Balance [Member] | Commercial and Industrial [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		104,811
Book Balance [Member] | Commercial and Industrial [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		113,818
Book Balance [Member] | Commercial and Industrial [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	88,308
Book Balance [Member] | Consumer and Other [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				2,954
Book Balance [Member] | Consumer and Other [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			7,803
Book Balance [Member] | Consumer and Other [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		1,770
Book Balance [Member] | Consumer and Other [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		41,660
Book Balance [Member] | Consumer and Other [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	26,221
Book Balance [Member] | Purchased Credit-Impaired [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				16,530
Book Balance [Member] | Purchased Credit-Impaired [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			11,093
Book Balance [Member] | Purchased Credit-Impaired [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		18,149
Book Balance [Member] | Purchased Credit-Impaired [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		54,320
Book Balance [Member] | Purchased Credit-Impaired [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	17,122
Fair Value [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				454,584
Fair Value [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			568,240
Fair Value [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		684,322
Fair Value [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		1,326,035
Fair Value [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	1,141,672
Fair Value [Member] | Residential Real Estate [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				37,419
Fair Value [Member] | Residential Real Estate [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			142,468
Fair Value [Member] | Residential Real Estate [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		146,057
Fair Value [Member] | Residential Real Estate [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		363,559
Fair Value [Member] | Residential Real Estate [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	280,200
Fair Value [Member] | Commercial Real Estate [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				259,727
Fair Value [Member] | Commercial Real Estate [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			317,578
Fair Value [Member] | Commercial Real Estate [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		371,323
Fair Value [Member] | Commercial Real Estate [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		627,900
Fair Value [Member] | Commercial Real Estate [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	557,730
Fair Value [Member] | Land, Development, Construction [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				46,618
Fair Value [Member] | Land, Development, Construction [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			46,489
Fair Value [Member] | Land, Development, Construction [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		57,331
Fair Value [Member] | Land, Development, Construction [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		146,639
Fair Value [Member] | Land, Development, Construction [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	178,687
Fair Value [Member] | Commercial and Industrial [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				95,701
Fair Value [Member] | Commercial and Industrial [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			46,274
Fair Value [Member] | Commercial and Industrial [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		99,650
Fair Value [Member] | Commercial and Industrial [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		110,630
Fair Value [Member] | Commercial and Industrial [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	87,062
Fair Value [Member] | Consumer and Other [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				2,901
Fair Value [Member] | Consumer and Other [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			7,604
Fair Value [Member] | Consumer and Other [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		1,729
Fair Value [Member] | Consumer and Other [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		41,276
Fair Value [Member] | Consumer and Other [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	26,561
Fair Value [Member] | Purchased Credit-Impaired [Member] | Platinum Bank Holding Company [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans				$ 12,218
Fair Value [Member] | Purchased Credit-Impaired [Member] | Gateway Financial Holdings Of Florida Inc [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			$ 7,827
Fair Value [Member] | Purchased Credit-Impaired [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		8,232
Fair Value [Member] | Purchased Credit-Impaired [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		$ 36,031
Fair Value [Member] | Purchased Credit-Impaired [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	$ 11,432

Business Combinations - Pro-For

Business Combinations - Pro-Forma Financial Information And Actual Results of Acquisition (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Combinations [Abstract]
Net interest income	$ 112,182	$ 109,779	$ 339,786	$ 315,211
Net income available to common shareholders	$ 51,250	$ 32,011	$ 131,102	$ 89,823
EPS - basic	$ 0.54	$ 0.34	$ 1.38	$ 0.96
EPS - diluted	$ 0.53	$ 0.33	$ 1.36	$ 0.94

Interest Rate Swap Derivative_2

Interest Rate Swap Derivatives - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivative Instruments Notional And Fair Value [Line Items]
Market value of securities pledged	$ 67,283	$ 59,682
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments Notional And Fair Value [Line Items]
Derivative, Notional Amount	5,044,615	3,740,430
Market value of securities pledged	0	19,048
Collateral reserve for derivatives	$ 5,236	$ 16,991

Interest Rate Swap Derivative_3

Interest Rate Swap Derivatives - Summary Information about the Interest Rate Swap Derivative Instruments (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair value of interest rate swap derivatives (asset)	$ 87,946	$ 42,480
Fair value of interest rate swap derivatives (liability)	88,065	43,259
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	$ 5,044,615	$ 3,740,430
Weighted average pay rate on interest-rate swaps	3.49%	3.00%
Weighted average receive rate on interest rate swaps	3.48%	3.00%
Weighted average maturity (years)	11 years	11 years
Fair value of interest rate swap derivatives (asset)	$ 87,946	$ 42,480
Fair value of interest rate swap derivatives (liability)	$ 88,065	$ 43,259

Revenue from Contracts with C_2

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 252,695	$ 173,248
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | ASU 2014-09 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 0
Revenue, performance obligation, description	There are no minimum orders or future performance obligations or deferred recognition requirements.
Contract revenues	$ 0

Recently Issued Accounting St_2

Recently Issued Accounting Standards - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Retained Earnings [Member]
Recently Issued Accounting Standards [Line Items]
Reclassification of the stranded tax effects on unrealized losses on AFS securities resulting from the change in federal tax rate	$ 1,241
Accumulated Other Comprehensive Income (Loss) [Member]
Recently Issued Accounting Standards [Line Items]
Reclassification of the stranded tax effects on unrealized losses on AFS securities resulting from the change in federal tax rate	$ (1,241)