CenterState Bank (CSFL) 10-K 27 Feb 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Feb. 26, 2020	Jun. 30, 2019
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	CENTERSTATE BANK CORPORATION
Entity Central Index Key	0001102266
Current Fiscal Year End Date	--12-31
Entity File Number	000-32017
Entity Tax Identification Number	59-3606741
Entity Address, Postal Zip Code	33880
Title of 12(b) Security	Common stock
Trading Symbol	CSFL
Security Exchange Name	NASDAQ
Document Annual Report	true
Document Transition Report	false
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Incorporation, State or Country Code	FL
Entity Address, Address Line One	1101 First Street South
Entity Address, Address Line Two	Suite 202
Entity Address, City or Town	Winter Haven
Entity Address, State or Province	FL
City Area Code	863
Local Phone Number	293-4710
Entity Common Stock, Shares Outstanding		124,429,792
Entity Public Float			$ 2,296,714,000
Documents Incorporated by Reference	Portions of the Proxy Statement for the Annual Meeting of Shareholders to be held on April 23, 2020 to be filed with the Securities and Exchange Commission pursuant to Regulation 14A within 120 days of the registrant’s fiscal year end are incorporated by reference into Part III, of this Annual Report on Form 10-K.

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks	$ 185,255	$ 107,007
Deposits in other financial institutions (restricted cash)	140,913	28,345
Federal funds sold and FRB deposits	163,890	231,981
Cash and cash equivalents	490,058	367,333
Trading securities, at fair value	4,987	1,737
Available for sale debt securities, at fair value	1,886,724	1,727,348
Held to maturity debt securities (fair value of $208,852 and $212,179 at December 31, 2019 and 2018, respectively)	202,903	216,833
Loans held for sale (see Note 4)	142,801	40,399
Loans, excluding purchased credit impaired	11,848,475	8,181,533
Purchased credit impaired loans	135,468	158,971
Allowance for loan losses	(40,655)	(39,770)
Net Loans	11,943,288	8,300,734
Bank premises and equipment, net	296,706	227,454
Right-of-use operating lease assets	32,163
Accrued interest receivable	40,945	33,143
FHLB, FRB and other stock, at cost	100,305	79,584
Goodwill	1,204,417	802,880
Core deposit intangible, net	91,157	66,225
Other intangible assets, net	4,507	2,953
Bank owned life insurance	330,155	267,820
Other repossessed real estate owned ("OREO")	5,092	2,909
Deferred income tax asset, net	28,786	51,462
Bank property held for sale	23,781	25,080
Interest rate swap derivatives, at fair value	273,068	92,475
Prepaid expense and other assets	40,182	31,219
TOTAL ASSETS	17,142,025	12,337,588
Deposits:
Demand - non-interest bearing	3,929,183	2,923,640
Demand - interest bearing	2,613,933	1,811,006
Savings and money market accounts	4,336,721	2,920,730
Time deposits	2,256,555	1,821,960
Total deposits	13,136,392	9,477,336
Securities sold under agreement to repurchase	93,141	57,772
Federal funds purchased	379,193	294,360
Other borrowed funds	161,000	361,000
Corporate and subordinated debentures	71,343	32,415
Accrued interest payable	3,998	2,627
Interest rate swap derivatives, at fair value	275,033	92,892
Operating lease liabilities	34,485
Payables and accrued expenses	90,722	47,842
Total liabilities	14,245,307	10,366,244
Equity:
Common stock, $.01 par value: 200,000,000 shares authorized; 125,173,597 and 95,679,596 shares issued and outstanding at December 31, 2019 and December 31, 2018, respectively	1,252	957
Additional paid-in capital	2,407,385	1,699,031
Retained earnings	465,680	293,777
Accumulated other comprehensive income (loss)	22,401	(22,421)
Total equity	2,896,718	1,971,344
TOTAL LIABILITIES AND EQUITY	$ 17,142,025	$ 12,337,588

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Held-to-maturity securities, fair value	$ 208,852	$ 212,179
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	125,173,597	95,679,596
Common stock, shares outstanding	125,173,597	95,679,596

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income:
Loans		$ 618,125	$ 405,881	$ 219,972
Investment securities:
Taxable		48,432	42,723	22,598
Tax-exempt		6,899	6,399	5,324
Federal funds sold and other		11,876	5,629	3,432
Total interest income		685,332	460,632	251,326
Interest expense:
Deposits		83,099	33,260	11,079
Securities sold under agreement to repurchase		1,106	632	246
Federal funds purchased and other borrowings		11,637	11,445	3,108
Corporate and subordinated debentures		3,726	2,213	1,350
Total interest expense		99,604	47,550	15,783
Net interest income		585,728	413,082	235,543
Provision for loan losses		10,585	8,283	4,958
Net interest income after loan loss provision		575,143	404,799	230,585
Non-interest income:
Correspondent banking capital markets revenue		60,373	28,884	23,520
Other correspondent banking related revenue		4,525	4,504	4,821
Small business administration loans revenue		5,136	3,532	775
Debit, prepaid, ATM and merchant card related fees		18,399	16,243	9,035
Wealth management related revenue		3,161	2,657	3,554
Bank owned life insurance income		7,801	5,976	3,293
Gain on sale of deposits		0	611	0
Gain on sale of trust department		0	0	1,224
Net gain (loss) on sale of available for sale debt securities		25	(22)	(7)
Other non-interest income		6,919	7,301	2,463
Total other income		166,060	105,127	65,175
Total other income		166,060	105,127	65,175
Net interest income after loan loss provision		575,143	404,799	230,585
Non-interest expense:
Salaries, wages and employee benefits		260,234	172,318	109,412
Occupancy expense		28,350	20,897	12,777
Depreciation of premises and equipment		14,438	9,788	7,247
Supplies, stationary and printing		3,234	2,498	1,610
Marketing expenses		7,540	6,235	3,929
Data processing expense		19,605	14,308	8,436
Legal, audit and other professional fees		8,870	6,163	3,644
Amortization of intangibles		16,030	10,018	4,066
Postage and delivery		3,967	2,961	1,938
ATM and debit card and merchant card related expenses		5,501	4,253	2,746
Bank regulatory expenses		5,048	4,885	3,051
Gain on sale of OREO		(428)	(1,933)	(876)
Valuation write down of OREO		395	482	682
(Gain) loss on repossessed assets other than real estate		(25)	138	(23)
Foreclosure related expenses		3,221	2,815	2,252
Merger related expenses		39,257	34,912	13,046
Impairment on bank property held for sale		1,736	2,667	519
Other expenses		29,934	19,062	12,029
Total other expenses		446,907	312,467	186,485
Income before provision for income taxes		294,296	197,459	109,275
Provision for income taxes		67,698	41,024	53,480
Net income		226,598	156,435	55,795
Earnings attributable to noncontrolling interest		1,202
Net income attributable to CenterState Bank Corporation		225,396	156,435	55,795
Net income		226,598	156,435	55,795
Other comprehensive gain (loss) income, net of tax:
Unrealized available for sale debt securities holding gain (loss), net of income taxes of $15,302, ($5,233) and $1,765, respectively		45,454	(15,432)	2,806
Unrealized interest rate swap holding loss, net of income taxes of ($204), $0 and $0, respectively		(613)
Less: reclassified adjustments for (gain) loss included in net income, net of income tax expense (benefit) of $6, ($6) and ($3), respectively		(19)	16	4
Net change in accumulated other comprehensive gain (loss)		44,822	(15,416)	2,810
Total comprehensive income		271,420	141,019	58,605
Comprehensive income attributable to noncontrolling interest		1,202
Total comprehensive income attributable to CenterState Bank Corporation		$ 270,218	$ 141,019	$ 58,605
Earnings per share:
Basic		$ 1.88	$ 1.78	$ 0.97
Diluted		$ 1.87	$ 1.76	$ 0.95
Common shares used in the calculation of earnings per share:
Basic	[1]	119,746,949	87,641,220	57,244,698
Diluted	[1]	120,603,823	88,758,853	58,340,813
Mortgage Banking Income
Non-interest income:
Non interest income		$ 29,553	$ 12,610	$ 1,511
Service Charges on Deposit Accounts
Non-interest income:
Non interest income		$ 30,168	$ 22,831	$ 14,986
[1]	Excludes participating securities.

CONSOLIDATED STATEMENTS OF IN_2

CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Unrealized available for sale debt securities holding (loss) gain, income taxes	$ 15,302	$ (5,233)	$ 1,765
Reclassifications of loss included in net income, income taxes	6	(6)	(3)
Unrealized interest rate swap holding loss, income taxes	$ (204)	$ 0	$ 0

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Platinum Bank Holding Company [Member]	Gateway Financial Holdings Of Florida Inc [Member]	Sunshine Bancorp, Inc. [Member]	HCBF Holding Company, Inc. [Member]	Charter Acquisition [Member]	National Commerce Corporation [Member]	Common Stock [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]	Common Stock [Member]Charter Acquisition [Member]	Common Stock [Member]National Commerce Corporation [Member]	Additional Paid in Capital [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]	Additional Paid in Capital [Member]Charter Acquisition [Member]	Additional Paid in Capital [Member]National Commerce Corporation [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non controlling Interest [Member]	Non controlling Interest [Member]National Commerce Corporation [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	55,795																					55,795
Net income	55,795
Unrealized holding gain (loss) on available for sale securities, net of deferred income tax	2,810																						2,810
Reclassification of the disproportionate tax effect on unrealized losses on available for sale securities resulting from the change in federal tax rate																						1,241	(1,241)
Dividends paid - common	(13,878)																					(13,878)
Stock grants issued	403							$ 2							401
Stock grants issued, shares								242,854
Stock based compensation expense	4,586														4,586
Stock options exercised	$ 6,715							$ 6							6,709
Stock options exercised including tax benefit, Shares	598,039							598,039
Stock repurchase	$ (1,131)							$ (1)							(1,130)
Stock repurchase, shares								(45,236)
Stock issued pursuant to Platinum Bank acquisition	63,262	$ 110,833	$ 107,087					$ 27	$ 43	$ 43					63,235	$ 110,790	$ 107,044
Stock issued pursuant to platinum acquisition, shares									4,279,255	4,244,441
Stock options acquired and converted pursuant to Gateway acquisition			$ 15,811														$ 15,811
Stock issued pursuant to public offering, net of costs, shares								2,695,000
Balances at ending at Dec. 31, 2017	904,750							$ 602							737,905							173,248	(7,005)
Balances at ending, shares at Dec. 31, 2017								60,161,334
Net income	156,435																					156,435
Net income	156,435
Unrealized holding gain (loss) on available for sale securities, net of deferred income tax	(15,416)																						(15,416)
Dividends paid - common	(35,906)																					(35,906)
Stock grants issued	650							$ 3							647
Stock grants issued, shares								236,921
Stock based compensation expense	4,193														4,193
Stock options exercised	$ 14,707							$ 18							14,689
Stock options exercised including tax benefit, Shares	1,793,339							1,793,339
Stock repurchase	$ (1,027)							$ (1)							(1,026)
Stock repurchase, shares								(38,496)
Stock issued pursuant to Platinum Bank acquisition				$ 181,413	$ 387,279	$ 349,809					$ 70	$ 151	$ 114					$ 181,343	$ 387,128	$ 349,695
Stock issued pursuant to platinum acquisition, shares											7,050,645	15,051,639	11,424,214
Stock options acquired and converted pursuant to Gateway acquisition				$ 6,432	$ 18,025													$ 6,432	$ 18,025
Balances at ending at Dec. 31, 2018	$ 1,971,344							$ 957							1,699,031							293,777	(22,421)
Balances at ending, shares at Dec. 31, 2018	95,679,596							95,679,596
Net income	$ 226,598																							$ 1,202
Net income	225,396																					225,396
Unrealized holding gain (loss) on available for sale securities, net of deferred income tax	45,435																						45,435
Unrealized holding loss on interest rate swaps, net of deferred income tax	(613)																						(613)
Cumulative adjustment pursuant to adoption of ASU 842 (Note 29)	1,093
Cumulative adjustment pursuant to adoption of ASU 842 (Note 29) | Accounting Standards Update 2016-02 [Member]	(1,093)																					(1,093)
Dividends paid - common	(52,400)																					(52,400)
Stock grants issued	800							$ 2							798
Stock grants issued, shares								202,709
Stock based compensation expense	5,149														5,149
Stock options exercised	3,101							$ 3							3,098
Stock options exercised including tax benefit, Shares								356,366
Stock repurchase	(132,077)							$ (57)							(132,020)
Stock repurchase, shares								(5,733,042)
Stock issued pursuant to Platinum Bank acquisition							$ 825,444							$ 347							$ 825,097
Stock issued pursuant to platinum acquisition, shares														34,667,968
Stock options acquired and converted pursuant to Gateway acquisition							6,232														$ 6,232
Noncontrolling interest from NCOM acquisition							$ 12,002																		$ 12,002
Distributions paid to noncontrolling interest	(1,065)																							(1,065)
Purchase of noncontrolling interest	(12,139)																							$ (12,139)
Balances at ending at Dec. 31, 2019	$ 2,896,718							$ 1,252							$ 2,407,385							$ 465,680	$ 22,401
Balances at ending, shares at Dec. 31, 2019	125,173,597							125,173,597

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrealized holding gain (loss) on available for sale securities, deferred income tax	$ 15,302	$ (5,233)	$ 1,765
Accumulated Other Comprehensive Income (Loss) [Member]
Unrealized holding gain (loss) on available for sale securities, deferred income tax	$ 15,296	$ 5,233	$ 1,765
Retained Earnings [Member]
Dividends paid - common, per share	$ 0.44	$ 0.40	$ 0.24
Additional Paid in Capital [Member]
Public Offering Costs			$ 529

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 226,598	$ 156,435	$ 55,795
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	10,585	8,283	4,958
Depreciation of premises and equipment	14,438	9,788	7,247
Accretion of purchase accounting adjustments	(59,275)	(51,131)	(34,264)
Net amortization of investment securities	11,125	12,449	9,954
Net deferred loan origination fees	1,826	1,873	345
(Gain) loss on sale of available for sale debt securities	(25)	22	7
Trading securities revenue	(99)	(57)	(242)
Purchases of trading securities	(194,799)	(254,555)	(230,074)
Proceeds from sale of trading securities	191,648	259,652	235,922
Valuation write down of OREO	395	482	682
Gain on sale of repossessed real estate owned	(428)	(1,933)	(876)
(Gain) loss on repossessed assets other than real estate	(25)	138	(23)
Gain on sale of residential loans held for sale	(29,491)	(10,803)	(1,511)
Residential loans originated and held for sale	(1,157,356)	(403,492)	(93,642)
Proceeds from sale of residential loans held for sale	1,100,207	403,583	77,791
Net change in fair value of residential loans held for sale	(1,174)	(1,081)
Gain on disposal of and or sale of fixed assets	(26)	(762)	(225)
Gain on disposal of bank property held for sale	(1,408)	(2,675)	(340)
Impairment on bank property held for sale	1,736	2,667	519
Gain on sale of small business administration loans	(5,136)	(3,532)	(775)
Small business administration loans originated for sale	(52,383)	(35,693)	(12,268)
Proceeds from sale of small business administration loans	57,519	39,225	13,043
Gain on sale of deposits	0	(611)	0
Gain on sale of trust department			(1,224)
Deferred income taxes	24,241	21,511	31,192
Tax deduction in excess of book deduction for stock awards	(999)	(6,149)	(3,007)
Stock based compensation expense	5,149	4,193	4,586
Bank owned life insurance income	(7,801)	(5,976)	(3,293)
Net cash from changes in:
Net changes in accrued interest receivable, prepaid expenses, and other assets	31,028	61,575	(48,145)
Net change in accrued interest payable, accrued expense, and other liabilities	(12,733)	(9,988)	10,625
Net cash provided by operating activities	153,337	193,438	22,757
Net cash provided by operating activities	153,337	193,438	22,757
Cash flows from investing activities:
Purchases of investment securities	(5,084)	(40,788)	(56,673)
Purchases of mortgage-backed securities	(465,051)	(539,807)	(444,146)
Proceeds from pay-downs of mortgage-backed securities	301,745	217,862	123,917
Proceeds from sales of investment securities	66,811	58,768	104,260
Proceeds from sales of mortgage-backed securities	160,341	296,884	208,432
Proceeds from called investment securities	10,870	1,210	865
Proceeds from maturities of investment securities	295	61,000	1,000
Purchases of investment securities	0	0	(2,693)
Purchases of mortgage-backed securities	0	0	(1,695)
Proceeds from pay-downs of mortgage-backed securities	12,747	14,232	20,874
Purchases of FHLB, FRB and other stock	(53,073)	(67,115)	(15,919)
Proceeds from sales of FHLB, FRB and other stock	49,427	36,244	5,572
Net increase in loans	(266,141)	(363,401)	(286,110)
Purchase of bank owned life insurance	0	0	(30,000)
Purchases of premises and equipment, net	(23,814)	(24,025)	(10,289)
Proceeds from sale of repossessed real estate	9,345	12,591	6,811
Proceeds from sale of premises and equipment, net	92	2,661	556
Proceeds from sale of bank property held for sale	18,748	16,001	7,437
Net cash from bank acquisitions	268,504	229,689	86,530
Net cash provided by (used in) investing activities	85,762	(87,994)	(281,271)
Cash flows from financing activities:
Net increase in deposits	176,161	97,083	180,744
Sale of deposits		25,341
Net increase in securities sold under agreement to repurchase	16,536	5,339	18,084
Net increase (decrease) in federal funds purchased	84,833	(37,130)	69,504
Net (decrease) increase in in other borrowings	(200,000)	(77,920)	40,268
Net decrease in payable to shareholders for acquisitions	(63)	(217)	(89)
Termination of corporate debentures		(9,000)
Stock options exercised	3,101	14,707	6,715
Proceeds from stock offering, net of offering costs	0	0	63,262
Stock repurchased	(132,077)	(1,027)	(1,131)
Dividends paid	(52,400)	(35,906)	(13,878)
Purchase of noncontrolling interest	(11,400)
Cash distribution paid to noncontrolling interest	(1,065)
Net cash (used in) provided by financing activities	(116,374)	(18,730)	363,479
Net cash increase in cash and cash equivalents	122,725	86,714	104,965
Cash and cash equivalents, beginning of period	367,333	280,619	175,654
Cash and cash equivalents, end of period	490,058	367,333	280,619
Supplemental noncash disclosures:
Transfer of loans to other real estate owned	10,620	4,661	3,108
Transfers of bank property to held for sale	6,450	4,302	4,534
New operating right-of-use assets	39,205
Cash paid during the period for:
Interest	101,946	48,450	17,493
Income taxes	$ 42,553	$ 16,624	$ 17,818

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	(1) Summary of Significant Accounting Policies (a) Nature of operations and principles of consolidation The Consolidated Financial Statements of CenterState Bank Corporation (the “Company”) include the accounts of the Company, and its wholly owned subsidiaries CenterState Bank, N.A., R4ALL, Inc. and CSFL Insurance Corp. All significant intercompany accounts and transactions have been eliminated in consolidation. At December 31, 2019, the Company, through its subsidiary bank, operated as a community bank headquartered in the state of Florida, providing traditional retail, commercial, mortgage, wealth management and SBA services throughout its Florida, Georgia and Alabama branch network and customer relationships in neighboring states. The Company’s primary deposit products are checking, savings and term certificate accounts, and its primary lending products include commercial real estate loans, residential real estate loans, commercial loans and consumer loans. Substantially all loans are secured by commercial real estate, residential real estate, business assets or consumer assets. There are no significant concentrations of loans to any one industry or customer. However, the customers’ ability to repay their loans is dependent on the real estate and general economic conditions in the area. The Company also provides correspondent banking and capital markets services to over 650 community banks nationwide. The Bank also owns CBI, which in turn owns Corporate Billing, a transaction-based finance company headquartered in Decatur, Alabama that provides factoring, invoicing, collection and accounts receivable management services to transportation companies and automotive parts and services providers throughout the United States and Canada. R4ALL, Inc. is a non-bank subsidiary incorporated during the third quarter of 2009. The primary purpose of this subsidiary is to purchase, hold, and dispose of troubled assets acquired from the Company’s subsidiary bank. CSFL Insurance Corp. is a non-bank subsidiary incorporated during the fourth quarter of 2015. The primary purpose of this subsidiary is to function as a captive insurance subsidiary pursuant to Section 831(b) of the U.S. Tax Code. National Commerce Risk Management, Inc., which was a captive insurance subsidiary pursuant to Section 831(b) of the U.S. Tax Code acquired from the NCOM transaction, was dissolved in December 2019. The following is a description of the basis of presentation and the significant accounting and reporting policies, which the Company follows in preparing and presenting its Consolidated Financial Statements. (b) Use of estimates To prepare financial statements in conformity with U.S. generally accepted accounting principles, management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided. Significant items subject to estimates and assumptions include allowance for loan losses, fair values of financial instruments, useful life of intangibles and valuation of goodwill, fair value estimates of stock-based compensation, fair value estimates of OREO, and deferred tax assets. Actual results could differ from these estimates. (c) Cash flow reporting For purposes of the statement of cash flows, the Company considers cash and due from banks, federal funds sold, money market and non-interest bearing deposits in other banks with a purchased maturity of three months or less to be cash equivalents. Net cash flows are reported for customer loan and deposit transactions, interest bearing deposits in other financial institutions, federal funds purchased, repurchase agreements, proceeds from capital offering and other borrowed funds. (d) Interest bearing deposits in other financial institutions Interest bearing deposits in other financial institutions mature within one year and are carried at cost and are included in Cash and Due From Banks in the Consolidated Balance Sheets. (e) The Company engages in trading activities for its own account. Securities that are held principally for resale in the near term are recorded at fair value with changes in fair value included in earnings. Interest is included in net interest income. (f) Investment Debt Securities Debt securities are classified as held to maturity and carried at amortized cost when management has the positive intent and ability to hold them to maturity. Debt securities not classified as held to maturity or trading are classified as available for sale. Debt securities available for sale are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of tax. Interest income includes amortization of purchase premium or discount. Premiums on securities are amortized to the earliest call date. Discounts on securities are amortized on the level-yield method without anticipating prepayments, except for mortgage backed securities where prepayments are anticipated. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. Securities are evaluated for other-than-temporary impairment (“OTTI”) on at least an annual basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement; and 2) other-than-temporary impairment related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. (g) Bond commissions revenue recognition Bond sales transactions and related revenue and expenses are recorded on a settlement date basis. The effect on the financial statements of using the settlement date basis rather than the trade date basis is not material. (h) Loans held for sale Mortgage loans originated and intended for sale in the secondary market are carried at fair value with changes in fair value recognized in current period earning. Net unrealized losses, if any, are recorded as a valuation allowance and charged to earnings. Mortgage loans held for sale are generally sold with servicing rights released. Gains and losses on sales of mortgage loans are based on the difference between the selling price and the carrying value of the related loan sold. (i) Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at their outstanding unpaid principal balance net of purchase premiums and discounts, deferred loan fees and costs, and an allowance for loan losses. Interest income is accrued on the unpaid principal balance. The recorded investment in a loan excludes accrued interest receivable, deferred fees, and deferred costs because they are not considered material. A loan is considered a troubled debt restructured loan based on individual facts and circumstances. A modification may include either an increase or reduction in interest rate or deferral of principal payments or both. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings. The Company classifies troubled debt restructured loans as impaired and evaluates the need for an allowance for loan losses on a loan-by-loan basis. An allowance for loan losses is based on either the present value of estimated future cash flows or the estimated fair value of the underlying collateral. Loans retain their accruing or non-accruing status at the time of modification. Loan origination fees and the incremental direct cost of loan origination, are deferred and recognized in interest income without anticipating prepayments over the contractual life of the loans. If the loan is prepaid, the remaining unamortized fees and costs are charged or credited to interest income. Amortization ceases for non-accrual loans. A loan is moved to non-accrual status in accordance with the Company’s policy typically after 90 days of non-payment, or less than 90 days of non-payment if management determines that the full timely collection of principal and interest becomes doubtful , excluding factored receivables. For CBI’s factored receivables, which are commercial trade credits rather than promissory notes, the Company’s practice, in most cases, is to charge-off unpaid recourse receivables when they become 90 days past due from the invoice due date and the non-recourse receivables when they become 120 days past due from the statement billing date . Past due status is based on the contractual terms of the loan. In all cases, loans are placed on non - accrual or charged-off at an earlier date if collection of principal or interest is considered doubtful. Non - accrual loans and loans past due 90 days still on accrual include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans. Single family home loans, consumer loans and smaller commercial, land, development and construction loans (less than $ 500 ) are monitored by payment history, and as such, past due payments is generally the triggering mechanism to determine non - accrual status. Larger (greater than $ 500 ) commercial, land, development and construction loans are monitored on a loan level basis, and therefore in these cases it is more likely that a loan may be placed on non - accrual status before it becomes 90 days past due. All interest accrued but not received for loans placed on non-accrual is reversed against interest income. Interest received on such loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Non real estate consumer loans are typically charged off no later than 120 days past due. The Company, considering current information and events regarding the borrower’s ability to repay their obligations, considers a loan to be impaired when it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is considered to be impaired, the amount of the impairment is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the secondary market value of the loan, or the fair value of the collateral for collateral dependent loans. Interest income on impaired loans is recognized in accordance with the Company’s non-accrual policy. Impaired loans are written down to the extent that principal is judged to be uncollectible and, in the case of impaired collateral dependent loans where repayment is expected to be provided solely by the underlying collateral and there is no other available and reliable sources of repayment, are written down to the lower of cost or collateral value less estimated selling costs. Impairment losses are included in the allowance for loan losses. Large groups of smaller balance homogeneous loans, such as consumer and residential real estate loans, are collectively evaluated for impairment, and accordingly, they are not separately identified for impairment disclosures. (j) Purchased credit-impaired loans As a part of business acquisitions, the Company acquires loans, some of which have shown evidence of credit deterioration since origination. These purchased credit-impaired (“PCI”) loans were determined to be credit impaired based on specific risk characteristics of the loan, including, but not limited to loans on non-accrual status, loans with insufficient cash flow, past due loans, high loan-to-value ratios, loans in process of foreclosure, or any TDR with loss potential. The Company, as a purchaser, is permitted to aggregate credit impaired loans acquired in the same fiscal quarter into one or more pools, provided that the loans have common risk characteristics. A pool is then accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. For the loan portfolios acquired, the Company aggregated the commercial, consumer, and residential loans into pools of loans with common risk characteristics for each institution acquired. These acquired loans were recorded at the acquisition date fair value, and after acquisition, losses are recognized through the allowance for loan losses. The Company estimates the amount and timing of expected cash flows for each acquired loan pool and the expected cash flows in excess of the amount paid is recorded as interest income over the remaining life of the loan pools. As frequently as quarterly or as long as annually, the Company updates the amount of loan principal and interest cash flows expected to be collected, incorporating assumptions regarding default rates, loss severities, the amounts and timing of prepayments and other factors that are reflective of current market conditions. Probable decreases in expected loan principal cash flows trigger the recognition of impairment, which is measured as the present value of the expected principal loss plus any related foregone interest cash flows discounted at the pool’s effective interest rate. Impairments that occur after the acquisition date are recognized through provision for loan losses. Probable and significant increases in expected principal cash flows would first reverse any previously recorded allowance for loan losses; any remaining increases are recognized prospectively as interest income over the life of the pool. The impacts of (i) prepayments, (ii) changes in variable interest rates, and (iii) any other changes in the timing of expected cash flows are recognized prospectively as adjustments to interest income over the life of the pool. Disposals of loans, which may include sales of loans, receipt of payments in full by the borrower, or foreclosure, result in removal of the loan from the purchased credit impaired portfolio. (k) Concentration of credit risk Most of the Company’s business activity is with customers located within Southeastern United States largely in Florida, Alabama and Georgia. Therefore, the Company’s exposure to credit risk is significantly affected by changes in the economy and the real estate market within Southeast. (l) Allowance for loan losses The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. Management estimates the allowance balance required using past loan loss experience, the nature and volume of the portfolio, information about specific borrower situations and estimated collateral values, economic conditions, and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged-off. The allowance consists of specific and general components. The specific component relates to loans that are individually classified as impaired. The general component covers loans that are not individually classified as impaired and is based on historical loss experience adjusted for current factors. A loan is impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Loans, for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings and classified as impaired. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported, net, at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Commercial, commercial real estate, land, acquisition and development, and construction loans over $500 are individually evaluated for impairment. Large groups of smaller balance homogeneous loans, such as consumer and residential real estate loans, are collectively evaluated for impairment, and accordingly, they are not separately identified for impairment disclosures. Troubled debt restructurings are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate. If a troubled debt restructuring is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. For troubled debt restructurings that subsequently default, the Company determines the amount of reserve in accordance with the accounting policy for the allowance for loan losses. The general component covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the most recent two years. The portfolio segments identified by the Company are residential loans, commercial real estate loans, construction and land development loans, commercial and industrial and consumer and other. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment. These economic factors include consideration of the following: levels of and trends in delinquencies and impaired loans; volume and severity of adversely classified or graded loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations. The Company segregates and evaluates its loan portfolio through the five portfolio segments: residential real estate, commercial real estate, land/ land development/construction, commercial and consumer/other. Residential real estate loans are a mixture of fixed rate and adjustable rate residential mortgage loans, including first mortgages, second mortgages or home equity lines of credit. As a policy, the Company holds adjustable rate loans and sells a portion of its fixed rate loan originations into the secondary market. Changes in interest rates or market conditions may impact a borrower’s ability to meet contractual principal and interest payments. Residential real estate loans are secured by real property. Commercial real estate loans include loans secured by office buildings, warehouses, retail stores and other property located in or near our markets. These loans are originated based on the borrower’s ability to service the debt and secondarily based on the fair value of the underlying collateral. Land/land development/construction loans include residential and commercial real estate loans and include a mixture of owner occupied and non-owner occupied. The majority of the loans in this category are land related, either undeveloped land, land held for development, residential building lots and commercial building lots. Generally the terms are three to five years, with a potential for renewal at maturity. Commercial loans consist of small-to medium-sized businesses including professional associations, medical services, retail trade, transportation, wholesale trade, manufacturing and tourism. Commercial loans are derived from our market areas and underwritten based on the borrower’s ability to service debt from the business’s underlying cash flows. As a general practice, we obtain collateral such as inventory, accounts receivable, equipment or other assets although such loans may be uncollateralized but guaranteed. Consumer and other loans include automobiles, boats, mobile homes without land, or uncollateralized but personally guaranteed loans. These loans are originated based primarily on credit scores, debt-to-income ratios and loan-to-value ratios. The Company evaluates the loans acquired from the Gulfstream, First Southern, Community Bank, First National, Platinum, Gateway, HCBF, Sunshine and NCOM acquisitions that were not PCI loans as individual loan portfolio segments. The Company considered the levels of and trends in non-performing loans, past-due loans, adverse loan grade classification changes, historical loss rates, environmental factors and impaired loans in arriving at its estimate. The general loan loss allowance recorded for these performing loans acquired from Gulfstream is allocated between the five portfolio segments described above in Note 5. (m) Transfer of financial assets Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. (n) Other repossessed real estate owned Assets acquired through or instead of loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed. Repossessed real estate is included in other repossessed real estate owned and other repossessed assets other than real estate is included in Prepaid Expenses and Other Assets in the Consolidated Balance Sheets. (o) Premises and equipment Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Depreciation is provided on a straight-line basis over the estimated useful lives of the related assets. Buildings are depreciated over a 39 year period, and furniture, fixtures and equipment are depreciated over their related useful life (3 to 15 years). Leasehold improvements are depreciated over the shorter of their useful lives or the term of the lease. Major renewals and betterments of property are capitalized; maintenance, repairs, and minor renewals and betterments are expensed in the period incurred. Upon retirement or other disposition of the asset, the asset cost and related accumulated depreciation are removed from the accounts, and gains or losses are included in income. (p) Software costs Costs of software developed for internal use, such as those related to software licenses, programming, testing, configuration, direct materials and integration, are capitalized and included in premises and equipment. Included in the capitalized costs are those costs related to both our personnel and third party consultants involved in the software development and installation. Once placed in service, the capitalized asset is amortized on a straight-line basis over its estimated useful life, generally three to five years. Capitalized costs of software developed for internal use are reviewed periodically for impairment. (q) Federal Home Loan Bank (FHLB), Federal Reserve Bank (FRB) and other stock The Company’s subsidiary bank is a member of the FHLB and FRB system. Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB, FRB and other stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income. (r) Bank owned life insurance (BOLI) The Company, through its subsidiary bank, has purchased life insurance policies on certain key executives or acquired through various bank acquisitions. Bank owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement. (s) Goodwill and other intangible assets Goodwill resulting from business combinations prior to January 1, 2009 represents the excess of the purchase price over the fair value of the net assets of businesses acquired. Goodwill resulting from business combinations after January 1, 2009, is generally determined as the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill and intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but tested for impairment at least annually. The Company has selected November 30 as the date to perform the annual impairment test. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Goodwill is the only intangible asset with an indefinite life on the Company’s balance sheet. The core deposit intangibles are intangible assets arising from either whole bank acquisitions or branch acquisitions. They are initially measured at fair value and then amortized over a ten-year As a part of normal business operations, the Company originates residential mortgage loans that have been pre-approved by secondary investors. The terms of the loans are set by the secondary investors, and the purchase price that the investor will pay for the loan is agreed to prior to the commitment of the loan by the Company. Generally within three weeks after funding, the loans are transferred to the investor in accordance with the agreed-upon terms. The Company records gains from the sale of these loans on the settlement date of the sale equal to the difference between the proceeds received and the carrying amount of the loan. The gain generally represents the portion of the proceeds attributed to servicing release premiums received from the investors and the realization of origination fees received from borrowers which were deferred as part of the carrying amount of the loan. Between the initial funding of the loans by the Company and the subsequent reimbursement by the investors, the Company carries the loans on its balance sheet at the lower of cost or market. The fair value of the underlying commitment is not material to the Consolidated Financial Statements. The standard structure of mortgage loan sales provides for the Company to retain a portion of the cash flow from the interest payments received on the loan. Fees for servicing loans for investors are based on the outstanding principal balance of the loans serviced and are recognized as income when earned. This cash flow is commonly known as a servicing spread. The servicing spread is recognized as a servicing asset to the extent the spread exceeds adequate compensation for the servicing function and recorded as a component of Other Intangible Assets in the Consolidated Balance Sheets. The fair value of the servicing asset is measured on a recurring basis at the present value of future cash flows using market-based discount assumptions. The future cash flows for each asset are based on their unique characteristics and market-based assumptions for prepayment speeds, default and voluntary prepayments. Adjustments to fair value are recorded as a component of Mortgage Banking Revenue. The value of our servicing portfolio is periodically independently evaluated. ( t ) Loan commitments and related financial instruments Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded. ( u ) Stock-based compensation Compensation cost is recognized for stock options and restricted stock awards issued to employees, based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of the Company’s common stock at the date of grant is used for restricted stock awards. During 2014 the Company initiated a Long-Term Incentive Plan which included Performance Share Units (“PSUs”). The Monte-Carlo Simulation model was used to estimate fair value of the PSUs at the grant date. Compensation cost is recognized over the required service period, generally defined as the vesting period. ( v ) Income taxes Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. The Company recognizes interest and/or penalties related to income tax matters in other expenses. On December 22, 2017, the U.S. federal government enacted a tax bill, H.R1 (“Tax Act”) which reduced the federal corporate tax rates effective January 1, 2018. As a result of this new tax bill, the Company evaluated its deferred tax assets and deferred tax liabilities to account for the future impact of lower corporate tax rates on its deferred tax assets. The reduction in the federal corporate tax rate resulted in a one-time charge to the Company’s 2017 earnings and reduction to its net deferred tax assets. See Note 15 for more details regarding Income Taxes. ( w ) Retirement plans Employee 401(k) plan expense is the amount of matching contributions. Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service. ( x ) Marketing and advertising costs Marketing and advertising costs are expensed as incurred. ( y ) Basic earnings per common share is net income divided by the weighted average number of common shares outstanding during the period. All outstanding unvested share-based

Trading Securities

Trading Securities	12 Months Ended
	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Trading Securities	(2) Trading Securities Realized and unrealized gains and losses are included in trading securities revenue, a component of non-interest income. Securities purchased for this portfolio have primarily been municipal securities. A list of the activity in this portfolio for 2019 and 2018 is summarized below. 2019 2018 Beginning balance $ 1,737 $ 6,777 Purchases 194,799 254,555 Proceeds from sales (191,648 ) (259,652 ) Net realized gain on sales 96 20 Net unrealized gains 3 37 Ending balance $ 4,987 $ 1,737

Investment Debt Securities

Investment Debt Securities	12 Months Ended
	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Investment Debt Securities	(3) Investment Debt Securities Available for Sale Debt Securities All of the mortgage-backed securities (“MBS”) listed below are residential FNMA, FHLMC, and GNMA MBSs. 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: December 31, 2019 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value Corporate debt securities $ 5,504 $ 153 $ — $ 5,657 Obligations of U.S. government sponsored entities and agencies 20,000 — 70 19,930 Mortgage-backed securities 1,742,221 26,403 1,382 1,767,242 Municipal securities 88,301 5,594 — 93,895 Total available for sale debt securities $ 1,856,026 $ 32,150 $ 1,452 $ 1,886,724 December 31, 2018 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value Corporate debt securities $ 6,265 $ 162 $ — $ 6,427 Obligations of U.S. government sponsored entities and agencies 38,794 7 933 37,868 Mortgage-backed securities 1,623,906 3,792 33,423 1,594,275 Municipal securities 88,415 698 335 88,778 Total available for sale debt securities $ 1,757,380 $ 4,659 $ 34,691 $ 1,727,348 The cost of securities sold is determined using the specific identification method. The securities sold during the second quarter of 2019 were collateralized loan obligation securities (“CLOs”) acquired through the NCOM acquisition. The CLOs were marked to fair value at acquisition and subsequently sold resulting in a loss of $5. The securities sold during the first quarter of 2018 include some securities acquired through the acquisitions of Sunshine and 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. Total sales of available for sale securities were as follows: 2019 2018 2017 Proceeds $ 227,152 $ 355,652 $ 312,692 Gross gains 1,132 68 740 Gross losses 1,107 90 747 The tax provisions related to these net realized gains and losses were $6, $(6) and $(3), respectively. Available for sale debt securities pledged at December 31, 2019 and 2018 had a carrying amount (estimated fair value) of $1,195,664 and $961,721, respectively. These securities were pledged primarily to secure public deposits and repurchase agreements. In addition, the amount at December 31, 2019 includes $361,127 of securities pledged to the third party dealers and clearinghouse exchanges for the Company’s cash flow hedge interest rate swaps. At year-end 2019 and 2018, there were no holdings of available for sale securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of shareholders’ equity. The fair value and amortized cost of available for sale debt securities at year end 2019 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 available for sale: Value Cost Due in one year or less $ 2,216 $ 2,193 Due after one year through five years 4,098 3,973 Due after five years through ten years 35,872 35,206 Due after ten years through thirty years 77,296 72,433 Mortgage-backed securities 1,767,242 1,742,221 Total available for sale debt securities $ 1,886,724 $ 1,856,026 The following tables show the Company’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position, at December 31, 2019 and 2018. December 31, 2019 Less than 12 months 12 months or more Total Unrealized Unrealized Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Obligations of U.S. government sponsored entities and agencies $ 19,930 $ 70 $ — $ — $ 19,930 $ 70 Mortgage-backed securities 125,249 388 117,903 994 243,152 1,382 Total temporarily impaired available for sale debt securities $ 145,179 $ 458 $ 117,903 $ 994 $ 263,082 $ 1,452 December 31, 2018 Less than 12 months 12 months or more Total Unrealized Unrealized Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Obligations of U.S. government sponsored entities and agencies $ 25,104 $ 332 $ 9,398 $ 601 $ 34,502 $ 933 Mortgage-backed securities 647,923 10,782 635,172 22,641 1,283,095 33,423 Municipal securities 25,031 316 3,381 19 28,412 335 Total temporarily impaired available for sale debt securities $ 698,058 $ 11,430 $ 647,951 $ 23,261 $ 1,346,009 $ 34,691 Mortgage-backed securities: At December 31, 2019, nearly 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 have the intent to sell these mortgage-backed securities and it is likely that it 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 December 31, 2019. Held to Maturity Debt Securities The following reflects the fair value of held to maturity securities and the related gross unrecognized gains and losses as of December 31, 2019 and 2018. December 31, 2019 Gross Gross Amortized Unrecognized Unrecognized Fair Cost Gains Losses Value Mortgage-backed securities $ 71,560 $ 456 $ 29 $ 71,987 Municipal securities 131,343 5,522 — 136,865 Total held to maturity debt securities $ 202,903 $ 5,978 $ 29 $ 208,852 December 31, 2018 Gross Gross Amortized Unrecognized Unrecognized Fair Cost Gains Losses Value Mortgage-backed securities $ 84,983 $ — $ 2,462 $ 82,521 Municipal securities 131,850 799 2,991 129,658 Total held to maturity debt securities $ 216,833 $ 799 $ 5,453 $ 212,179 Held to maturity debt securities pledged at December 31, 2019 and 2018 had a carrying amount of $100,582 and $103,710. These securities were pledged primarily to secure public deposits and repurchase agreements. At year-end 2019 and 2018, there were no holdings of held to maturity securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% The fair value and amortized cost of held to maturity debt securities at year end 2019 by contractual maturity were as follows. Mortgage-backed securities are not due at a single maturity date and are shown separately. Amortized Investment securities held to maturity Fair Value Cost Due after five years through ten years $ 2,064 $ 2,031 Due after ten years through thirty years 134,801 129,312 Mortgage-backed securities 71,987 71,560 Total held to maturity debt securities $ 208,852 $ 202,903 The following tables show the Company’s held to maturity debt 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 December 31, 2019 and 2018. December 31, 2019 Less than 12 months 12 months or more Total Unrealized Unrealized Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Mortgage-backed securities $ — $ — $ 8,445 $ 29 $ 8,445 $ 29 Total temporarily impaired held to maturity debt securities $ — $ — $ 8,445 $ 29 $ 8,445 $ 29 December 31, 2018 Less than 12 months 12 months or more Total Unrealized Unrealized Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Mortgage-backed securities $ — $ — $ 82,521 $ 2,462 $ 82,521 $ 2,462 Municipal securities 22,560 203 47,807 2,788 70,367 2,991 Total temporarily impaired held to maturity debt securities $ 22,560 $ 203 $ 130,328 $ 5,250 $ 152,888 $ 5,453 Mortgage-backed securities: At December 31, 2019, 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 have the intent to sell these mortgage-backed securities and it is likely that it 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 December 31, 2019.

Loans Held for Sale

Loans Held for Sale	12 Months Ended
	Dec. 31, 2019
Receivables Held For Sale [Abstract]
Loans Held for Sale	(4) The Company accounts for the loans held for sale 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. Net gains from changes in estimated fair value of mortgage loans held for sale were $1,174 and $1,081 at December 31, 2019 and 2018, respectively. The total unpaid principal balances of loans held for sale were $141,627 and $39,318 at December 31, 2019 and 2018, respectively. No loans held for sale at December 31, 2019 and 2018 were past due or on non-accrual. The table below summarizes the activity in mortgage loans held for sale for the years ended December 31, 2019 and 2018. December 31, 2019 2018 Beginning balance $ 40,399 $ 19,647 Effect from acquisitions 14,588 8,959 Loans originated 1,157,356 403,492 Proceeds from sales (1,100,207 ) (403,583 ) Net change in fair value 1,174 1,081 Net realized gain on sales 29,491 10,803 Ending balance $ 142,801 $ 40,399 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 began utilizing these derivative financial instruments on its loans held for sale in 2018 to manage interest rate risk and not for speculative purposes. The table below summarizes the main components of Mortgage Banking Revenue as reported in the Company’s Consolidated Statements of Income and Comprehensive Income during the years ended December 31, 2019 and 2018 . 2019 2018 Servicing fees and commissions $ 358 $ 196 Gain on sale of loans held for sale 29,491 10,803 Unrealized gain on loans held for sale 1,174 1,081 Net gain on mortgage derivatives 494 614 Loss on mortgage hedge (1,731 ) (46 ) Loss on mortgage servicing assets (233 ) (38 ) Mortgage banking revenue $ 29,553 $ 12,610 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 December 31, 2019 and 2018. Notional at December 31, 2019 December 31, 2018 Interest rate lock commitments $ 125,409 $ 49,545 Best efforts forward trades 123,638 61,865 MBS forward trades 119,500 30,000 Total derivative instruments $ 368,547 $ 141,410 Mortgage banking derivatives, which are included in Other Assets and Other Liabilities on the Company’s Consolidated Balance Sheets, 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.

Loans

Loans	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Loans	(5 ) Loans The following table sets forth information concerning the loan portfolio by collateral types as of December 31, 2019 and 2018 are: December 31, 2019 December 31, 2018 Loans excluding PCI loans Real estate loans Residential $ 2,512,544 $ 1,702,114 Commercial 6,325,108 4,454,098 Land, development and construction 999,923 635,562 Total real estate 9,837,575 6,791,774 Commercial, industrial & factored receivables 1,759,074 1,183,380 Consumer and other loans 247,307 203,686 Loans before unearned fees and deferred cost 11,843,956 8,178,840 Net unearned fees and costs 4,519 2,693 Total loans excluding PCI loans 11,848,475 8,181,533 PCI loans (note 1) Real estate loans Residential 45,795 58,804 Commercial 81,576 87,336 Land, development and construction 4,655 7,028 Total real estate 132,026 153,168 Commercial and industrial 3,342 5,594 Consumer and other loans 100 209 Total PCI loans 135,468 158,971 Total loans 11,983,943 8,340,504 Allowance for loan losses for loans that are not PCI loans (40,429 ) (39,579 ) Allowance for loan losses for PCI loans (226 ) (191 ) Total loans, net of allowance for loan losses $ 11,943,288 $ 8,300,734 n ote 1: Purchased credit - impaired (“PCI”) loans are being accounted for pursuant to ASC Topic 310-30. The following tables present the activity in the allowance for loan losses by portfolio segment for the years ended December 31, 2019, 2018 and 2017. Real Estate Loans Residential Commercial Land, Develop., Constr. Comm., Industrial & Factored Receivables Consumer & Other Total Allowance for loan losses for loans that are not PCI loans: Twelve-month ended December 31, 2019 Beginning of the period $ 5,518 $ 22,978 $ 1,781 $ 6,414 $ 2,888 $ 39,579 Charge-offs (721 ) (567 ) (42 ) (9,545 ) (3,182 ) (14,057 ) Recoveries 710 1,057 85 1,934 571 4,357 Provision for loan losses (1,250 ) (4,916 ) 495 12,479 3,742 10,550 Balance at end of period $ 4,257 $ 18,552 $ 2,319 $ 11,282 $ 4,019 $ 40,429 Twelve-month ended December 31, 2018 Beginning of the period $ 6,003 $ 19,304 $ 1,179 $ 4,130 $ 1,914 $ 32,530 Charge-offs (516 ) (13 ) (126 ) (1,474 ) (1,706 ) (3,835 ) Recoveries 1,027 679 39 360 327 2,432 Provision for loan losses (996 ) 3,008 689 3,398 2,353 8,452 Balance at end of period $ 5,518 $ 22,978 $ 1,781 $ 6,414 $ 2,888 $ 39,579 Twelve-month ended December 31, 2017 Beginning of the period $ 5,640 $ 14,713 $ 883 $ 3,785 $ 1,548 $ 26,569 Charge-offs (254 ) (74 ) — (677 ) (994 ) (1,999 ) Recoveries 950 662 596 334 217 2,759 Provision for loan losses (333 ) 4,003 (300 ) 688 1,143 5,201 Balance at end of period $ 6,003 $ 19,304 $ 1,179 $ 4,130 $ 1,914 $ 32,530 Real Estate Loans Residential Commercial Land, Develop., Constr. Comm., Industrial & Factored Receivables Consumer & Other Total Allowance for loan losses for loans that are PCI loans: Twelve-month ended December 31, 2019 Beginning of the period $ — $ — $ 177 $ — $ 14 $ 191 Charge-offs — — — — — — Recoveries — — — — — — Provision for loan losses — — — — 35 35 Balance at end of period $ — $ — $ 177 $ — $ 49 $ 226 Twelve-month ended December 31, 2018 Beginning of the period $ — $ 59 $ 222 $ — $ 14 $ 295 Charge-offs — — — (10 ) — (10 ) Recoveries — — — 75 — 75 Provision for loan losses — (59 ) (45 ) (65 ) — (169 ) Balance at end of period $ — $ — $ 177 $ — $ 14 $ 191 Twelve-month ended December 31, 2017 Beginning of the period $ 54 $ 92 $ 312 $ — $ 14 $ 472 Charge-offs — — — — — — Recoveries — 66 — — — 66 Provision for loan losses (54 ) (99 ) (90 ) — — (243 ) Balance at end of period $ — $ 59 $ 222 $ — $ 14 $ 295 The following table presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of December 31, 2019 and 2018. Accrued interest receivable and unearned fees/costs are not included in the recorded investment because they are not material. Real Estate Loans Residential Commercial Land, Develop., Constr. Comm., Industrial & Factored Receivables Consumer & Other Total As of December 31, 2019 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 588 $ 375 $ — $ 914 $ 1 $ 1,878 Collectively evaluated for impairment 3,669 18,177 2,319 10,368 4,018 38,551 Purchased credit impaired — — 177 — 49 226 Total ending allowance balance $ 4,257 $ 18,552 $ 2,496 $ 11,282 $ 4,068 $ 40,655 Loans: Individually evaluated for impairment $ 6,475 $ 11,445 $ 865 $ 7,232 $ 123 $ 26,140 Collectively evaluated for impairment 2,506,069 6,313,663 999,058 1,751,842 247,184 11,817,816 Purchased credit impaired 45,795 81,576 4,655 3,342 100 135,468 Total ending loan balances $ 2,558,339 $ 6,406,684 $ 1,004,578 $ 1,762,416 $ 247,407 $ 11,979,424 Real Estate Loans Residential Commercial Land, Develop., Constr. Comm. & Industrial Consumer & Other Total As of December 31, 2018 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 331 $ 250 $ — $ 1,034 $ 1 $ 1,616 Collectively evaluated for impairment 5,187 22,728 1,781 5,380 2,887 37,963 Purchased credit impaired — — 177 — 14 191 Total ending allowance balance $ 5,518 $ 22,978 $ 1,958 $ 6,414 $ 2,902 $ 39,770 Loans: Individually evaluated for impairment $ 6,234 $ 7,496 $ 117 $ 1,708 $ 145 $ 15,700 Collectively evaluated for impairment 1,695,880 4,446,602 635,445 1,181,672 203,541 8,163,140 Purchased credit impaired 58,804 87,336 7,028 5,594 209 158,971 Total ending loan balances $ 1,760,918 $ 4,541,434 $ 642,590 $ 1,188,974 $ 203,895 $ 8,337,811 The following is a summary of information regarding impaired loans at December 31, 2019 and 2018: December 31, 2019 December 31, 2018 Performing TDRs (these are not included in nonperforming loans ("NPLs")) $ 8,012 $ 8,475 Nonperforming TDRs (these are included in NPLs) 4,512 1,002 Total TDRs (these are included in impaired loans) 12,524 9,477 Impaired loans that are not TDRs 13,616 6,223 Total impaired loans $ 26,140 $ 15,700 Troubled Debt Restructurings: In certain circumstances, it may be beneficial to modify or restructure the terms of a loan (i.e. troubled debt restructure or “TDR”) and work with the borrower for the benefit of both parties, versus forcing the property into foreclosure and having to dispose of it in an unfavorable real estate market. When the Company modifies the terms of a loan, it usually either reduces the monthly payment and/or interest rate for generally twelve to twenty-four months. The Company has not forgiven any material principal amounts on any loan modifications to date. The Company has $12,524 of TDRs. Of this amount $8,012 are performing pursuant to their modified terms, and $4,512 are not performing and have been placed on non-accrual status and included in our non-performing loans (“NPLs”). TDRs as of December 31, 2019 and 2018 quantified by loan type classified separately as accrual (performing loans) and non-accrual (non-performing loans) are presented in the table below. Accruing Non-Accrual Total As of December 31, 2019 Real estate loans: Residential $ 4,862 $ 1,147 $ 6,009 Commercial 1,706 — 1,706 Land, development, construction 175 — 175 Total real estate loans 6,743 1,147 7,890 Commercial and industrial 1,146 3,365 4,511 Consumer and other 123 — 123 Total TDRs $ 8,012 $ 4,512 $ 12,524 Accruing Non-Accrual Total As of December 31, 2018 Real estate loans: Residential $ 5,848 $ 386 $ 6,234 Commercial 1,837 566 2,403 Land, development, construction 77 41 118 Total real estate loans 7,762 993 8,755 Commercial and industrial 577 — 577 Consumer and other 136 9 145 Total TDRs $ 8,475 $ 1,002 $ 9,477 The Company’s 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. The Company’s 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 $970, $77 and $265 and partial charge offs of $702, $44 and $72 on TDR loans during the periods ending December 31, 2019, 2018 and 2017, respectively. Loans are modified to minimize loan losses when management believes the modification will improve the borrower’s financial condition and ability to repay the loan. The Company typically does not forgive principal. The Company generally either reduces interest rates or decreases monthly payments for a temporary period of time and those reductions of cash flows are capitalized into the loan balance. The Company 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 management tries to accommodate the borrower and minimize the Company’s potential losses. Approximately 64% of the Company’s TDRs are current pursuant to their modified terms, and $4,512, or approximately 36% of the Company’s 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 twelve-month periods ending December 31, 2019, 2018 and 2017 were $5,228, $1,830, and $2,258. The Company recorded a loan loss provision of $911, $9 and $14 for loans modified during the twelve-month periods ending December 31, 2019, 2018 and 2017. The following table presents loans by class modified as TDRs for which there was a payment default within twelve months following the modification during the years ending December 31, 2019, 2018 and 2017. Period ending Period ending Period ending December 31, 2019 December 31, 2018 December 31, 2017 Number Recorded Number Recorded Number Recorded of loans investment of loans investment of loans investment Residential — $ — — $ — — $ — Commercial real estate — — 1 433 1 177 Land, development, construction — — 1 49 — — Commercial and industrial — — — — — — Consumer and other — — — — — — Total — $ — 2 $ 482 1 $ 177 The Company recorded no provision for loan loss expense or partial charge offs during the years ending December 31, 2019 and 2018 on TDR loans that subsequently defaulted as described above. The Company recorded $8 in provision for loan loss expense and $8 in partial charge offs during the year ending December 31, 2017 on TDR loans that subsequently defaulted as described above. The Company has allocated $494 and $334 of specific reserves to customers whose loan terms have been modified in troubled debt restructurings as of December 31, 2019 and 2018. The Company has not committed to lend additional amounts to customers with outstanding loans that are classified as troubled debt restructurings. The following tables present loans individually evaluated for impairment by class of loans as of December 31, 2019 and 2018 excluding purchased credit-impaired loans accounted for pursuant to ASC Topic 310-30. The recorded investment is less than the unpaid principal balance primarily due to partial charge-offs. Unpaid principal balance Recorded investment Allowance for loan losses allocated As of December 31, 2019 With no related allowance recorded: Residential real estate $ 2,894 $ 2,744 $ — Commercial real estate 11,031 10,015 — Land, development, construction 886 865 — Commercial and industrial 5,522 4,820 — Consumer, other 99 98 — With an allowance recorded: Residential real estate 3,920 3,731 588 Commercial real estate 1,438 1,430 375 Land, development, construction — — — Commercial and industrial 2,486 2,412 914 Consumer, other 31 25 1 Total $ 28,307 $ 26,140 $ 1,878 Unpaid principal balance Recorded investment Allowance for loan losses allocated As of December 31, 2018 With no related allowance recorded: Residential real estate $ 3,608 $ 3,485 $ — Commercial real estate 6,447 5,906 — Land, development, construction 144 117 — Commercial and industrial 364 353 — Consumer, other 109 108 — With an allowance recorded: Residential real estate 2,897 2,749 331 Commercial real estate 1,593 1,590 250 Land, development, construction — — — Commercial and industrial 1,378 1,355 1,034 Consumer, other 53 37 1 Total $ 16,593 $ 15,700 $ 1,616 0 Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized December 31, 2019 Real estate loans: Residential $ 6,153 $ 233 $ — Commercial 9,420 102 — Land, development, construction 216 8 — Total real estate loans 15,789 343 — Commercial and industrial 5,446 59 — Consumer and other loans 126 8 — Total $ 21,361 $ 410 $ — Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized December, 31, 2018 Real estate loans: Residential $ 7,492 $ 308 $ — Commercial 7,876 104 — Land, development, construction 588 8 — Total real estate loans 15,956 420 — Commercial and industrial 2,081 33 — Consumer and other loans 174 8 — Total $ 18,211 $ 461 $ — Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized December, 31, 2017 Real estate loans: Residential $ 7,731 $ 267 $ — Commercial 8,956 145 — Land, development, construction 432 18 — Total real estate loans 17,119 430 — Commercial and industrial 1,968 29 — Consumer and other loans 240 10 — Total $ 19,327 $ 469 $ — The following tables present the recorded investment in non-accrual loans and loans past due over 90 days still on accrual by class of loans as of December 31, 2019 and 2018 excluding purchased credit-impaired loans accounted for pursuant to ASC Topic 310-30: Non-accrual Loans Past Due Over 90 Days Still Accruing As of December 31, 2019 Residential real estate $ 13,455 $ — Commercial real estate 12,141 — Land, development, construction 2,516 — Comm., industrial & factored receivables 7,884 1,692 Consumer, other 920 — Total $ 36,916 $ 1,692 Non-accrual Loans Past Due Over 90 Days Still Accruing As of December 31, 2018 Residential real estate $ 11,488 $ — Commercial real estate 8,445 — Land, development, construction 795 — Commercial and industrial 2,274 — Consumer, other 565 — Total $ 23,567 $ — The following tables present the aging of the recorded investment in past due loans as of December 31, 2019 and 2018, excluding purchased credit-impaired loans accounted for pursuant to ASC Topic 310-30: 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, 2019 Residential real estate $ 2,512,544 $ 7,601 $ 5,928 $ — $ 13,529 $ 2,485,560 $ 13,455 Commercial real estate 6,325,108 7,554 2,577 — 10,131 6,302,836 12,141 Land, development, construction 999,923 1,343 2,349 — 3,692 993,715 2,516 Comm., industrial & factored receivables 1,759,074 14,924 12,465 1,692 29,081 1,722,109 7,884 Consumer 247,307 1,663 907 — 2,570 243,817 920 $ 11,843,956 $ 33,085 $ 24,226 $ 1,692 $ 59,003 $ 11,748,037 $ 36,916 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, 2018 Residential real estate $ 1,702,114 $ 5,730 $ 5,631 $ — $ 11,360 $ 1,679,266 $ 11,488 Commercial real estate 4,454,098 10,840 4,607 — 15,446 4,430,207 8,445 Land, development, construction 635,562 661 4,022 — 4,683 630,084 795 Comm. & industrial 1,183,380 2,803 878 — 3,681 1,177,425 2,274 Consumer 203,686 1,061 271 — 1,332 201,789 565 $ 8,178,840 $ 21,094 $ 15,408 $ — $ 36,502 $ 8,118,771 $ 23,567 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. As of December 31, 2019 and 2018, and based on the most recent analysis performed, the risk category of loans by class of loans, excluding purchased credit-impaired loans accounted for pursuant to ASC Topic 310-30, is presented below. As of December 31, 2019 Loan Category Pass Special Mention Substandard Doubtful Residential real estate $ 2,455,752 $ 31,189 $ 25,603 $ — Commercial real estate 6,151,309 118,412 55,387 — Land, development, construction 989,860 6,418 3,645 — Comm., industrial & factored receivables 1,705,862 35,070 18,142 — Consumer 245,905 160 1,242 — Total $ 11,548,688 $ 191,249 $ 104,019 $ — As of December 31, 2018 Loan Category Pass Special Mention Substandard Doubtful Residential real estate $ 1,633,810 $ 41,522 $ 26,782 $ — Commercial real estate 4,246,687 160,981 46,430 — Land, development, construction 610,631 20,586 4,345 — Comm. & industrial 1,137,272 40,836 5,272 — Consumer 202,701 247 738 — Total $ 7,831,100 $ 264,172 $ 83,568 $ — 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 accounted for pursuant to ASC Topic 310-30, based on payment activity as of December 31, 2019 and 2018: Residential Consumer As of December 31, 2019 Performing $ 2,499,089 $ 246,387 Nonperforming 13,455 920 Total $ 2,512,544 $ 247,307 Residential Consumer As of December 31, 2018 Performing $ 1,690,626 $ 203,121 Nonperforming 11,488 565 Total $ 1,702,114 $ 203,686 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 December 31, 2019, 2018 and 2017. Contractually required principal and interest payments have been adjusted for estimated prepayments. December 31, 2019 2018 2017 Contractually required principal and interest $ 244,189 $ 267,815 $ 248,283 Non-accretable difference (46,271 ) (38,602 ) (13,183 ) Cash flows expected to be collected 197,918 229,213 235,100 Accretable yield (62,450 ) (70,242 ) (70,942 ) Carrying value of acquired loans 135,468 158,971 164,158 Allowance for loan losses (226 ) (191 ) (295 ) Carrying value less allowance for loan losses $ 135,242 $ 158,780 $ 163,863 The Company recorded $35, ($169) and ($243) in loan loss provision expense (recovery) on PCI loans during the years ending December 31, 2019, 2018 and 2017, respectively. The Company adjusted its estimates of future expected losses, cash flows and renewal assumptions during the current year. These adjustments resulted in an increase in expected cash flows and accretable yield, and a decrease in the non-accretable difference. The Company reclassified approximately $18,450, $22,469 and $4,707 from non-accretable difference to accretable yield during the twelve-month periods ending December 31, 2019, 2018 and 2017, respectively, to reflect the adjusted estimates of future expected cash flows. The Company recognized approximately $33,766 of accretion income during the twelve-month period ending December 31, 2019. 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 periods ending December 31, 2019, 2018 and 2017. Effect of Income All Other Dec. 31, 2018 Acquisitions Accretion Adjustments Dec. 31, 2019 Contractually required principal and interest $ 267,815 $ 51,527 $ — $ (75,153 ) $ 244,189 Non-accretable difference (38,602 ) (29,187 ) — 21,518 (46,271 ) Cash flows expected to be collected 229,213 22,340 — (53,635 ) 197,918 Accretable yield (70,242 ) (3,724 ) 33,766 (22,250 ) (62,450 ) Carry value of acquired loans $ 158,971 $ 18,616 $ 33,766 $ (75,885 ) $ 135,468 Effect of Income All Other Dec. 31, 2017 Acquisitions Accretion Adjustments Dec. 31, 2018 Contractually required principal and interest $ 248,283 $ 122,392 $ — $ (102,860 ) $ 267,815 Non-accretable difference (13,183 ) (58,927 ) — 33,508 (38,602 ) Cash flows expected to be collected 235,100 63,465 — (69,352 ) 229,213 Accretable yield (70,942 ) (7,770 ) 35,944 (27,474 ) (70,242 ) Carry value of acquired loans $ 164,158 $ 55,695 $ 35,944 $ (96,826 ) $ 158,971 Effect of Income All Other Dec. 31, 2016 Acquisitions Accretion Adjustments Dec. 31, 2017 Contractually required principal and interest $ 297,821 $ 31,334 $ — $ (80,872 ) $ 248,283 Non-accretable difference (18,372 ) (7,104 ) — 12,293 (13,183 ) Cash flows expected to be collected 279,449 24,230 — (68,579 ) 235,100 Accretable yield (93,525 ) (4,185 ) 32,388 (5,620 ) (70,942 ) Carry value of acquired loans $ 185,924 $ 20,045 $ 32,388 $ (74,199 ) $ 164,158

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2019
Real Estate [Abstract]
Other Real Estate Owned	(6 ) Other real estate owned Other real estate owned is real estate acquired through or instead of loan foreclosure. Activity in the valuation allowance was as follows: 2019 2018 2017 Beginning of year $ 404 $ 861 $ 869 Valuation write down of OREO 395 482 682 Sales and/or dispositions (284 ) (939 ) (690 ) End of year $ 515 $ 404 $ 861 Expenses related to foreclosed real estate include: 2019 2018 2017 Gain on sale of OREO $ (428 ) $ (1,933 ) $ (876 ) Valuation write down of repossessed real estate 395 482 682 Operating expenses, net of rental income 3,221 2,815 2,252 Total $ 3,188 $ 1,364 $ 2,058

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value	(7 ) 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 an asset or liability. The fair values of available for sale 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; 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. The Company has the rights to service a portfolio of Fannie Mae ("FNMA") and other loans sold on a servicing retained basis. The fair value of mortgage servicing assets are measured when the loan is sold and subsequently measured at fair value on a recurring basis. Management uses a model operated and maintained by a third party to calculate the present value of future cash flows using the third party's market-based assumptions. The future cash flows for each asset are based on the asset's unique characteristics and the third party's market-based assumptions for prepayment speeds, default and voluntary prepayments (Level 2). Adjustments to fair value are recorded as a component of Mortgage Banking Revenue in the Consolidated Statements of Income and Comprehensive Income. Effective January 1, 2018, the Company elected to account for mortgage loans held for sale 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 market prices for mortgage forward trades and mortgage interest rates (Level 2) and estimated pull through percentages from the date the interest on the loan is locked (Level 3). The Company has the rights to service a portfolio of Fannie Mae ("FNMA"), Freddie Mac (“FHLMC”) and other government guaranteed loans sold on a servicing retained basis. Mortgage servicing assets are measured at fair value when the loan is sold and subsequently measured at fair value on a recurring basis utilizing Level 2 inputs. Management uses a model operated and maintained by a third party to calculate the present value of future cash flows using the third party's market-based assumptions. The future cash flows for each asset are based on the asset's unique characteristics and the third party's market-based assumptions for prepayment speeds, default and voluntary prepayments. Adjustments to fair value are recorded as a component of Mortgage Banking Revenue in the Consolidated Statements of Income and Comprehensive Income. 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. 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 December 31, 2019, the range of capitalization rates utilized to determine the fair value of the underlying collateral ranged from 8% to 13%. Adjustments to comparable sales 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 and other real estate owned are considered a Level 3 in the fair value hierarchy. 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 December 31,2019 Assets: Trading securities $ 4,987 $ — $ 4,987 $ — Available for sale debt securities Corporate debt securities 5,657 — 5,657 — Obligations of U.S. government sponsored entities and agencies 19,930 — 19,930 — Mortgage-backed securities 1,767,242 — 1,767,242 — Municipal securities 93,895 — 93,895 — Loans held for sale 142,801 — 142,801 — Mortgage servicing assets 1,332 — 1,332 — Mortgage banking derivatives 1,761 — 14 1,747 Interest rate swap derivatives 273,068 — 273,068 — Liabilities: Mortgage banking derivatives 305 — 288 17 Interest rate swap derivatives 275,033 — 275,033 — at December 31,2018 Assets: Trading securities $ 1,737 $ — $ 1,737 $ — Available for sale debt securities Corporate debt securities 6,427 — 6,427 — Obligations of U.S. government sponsored entities and agencies 37,868 — 37,868 — Mortgage-backed securities 1,594,275 — 1,594,275 — Municipal securities 88,778 — 88,778 — Loans held for sale 40,399 — 40,399 — Mortgage servicing assets 1,565 — 1,565 — Mortgage banking derivatives 783 — — 783 Interest rate swap derivatives 92,475 — 92,475 — Liabilities: Mortgage banking derivatives 169 — 164 5 Interest rate swap derivatives 92,892 — 92,892 — Assets and liabilities measured at fair value on a non-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 December 31,2019 Assets: Impaired loans Residential real estate $ 2,213 $ — $ — $ 2,213 Commercial real estate 8,177 — — 8,177 Land, land development and construction 847 — — 847 Commercial 5,564 — — 5,564 Consumer 47 — — 47 Other real estate owned Commercial real estate 2,129 — — 2,129 Land, land development and construction 340 — — 340 Bank property held for sale 4,160 — — 4,160 at December 31,2018 Assets: Impaired loans Residential real estate $ 1,811 $ — $ — $ 1,811 Commercial real estate 5,614 — — 5,614 Land, land development and construction 90 — — 90 Commercial 1,274 — — 1,274 Consumer 40 — — 40 Other real estate owned Land, land development and construction 867 — — 867 Bank property held for sale 5,805 — — 5,805 Impaired loans measured at fair value had a recorded investment of $18,556 with a valuation allowance of $1,708 at December 31, 2019, and a recorded investment of $8,829, with a valuation allowance of $1,463, at December 31, 2018. The Company recorded a provision for loan loss expense of $2,739 and $1,363 on these loans during the years ending 2019 and 2018, respectively. Other real estate owned had a decline in fair value of $395 and $482 during the twelve-month periods ending December 31, 2019 and 2018, respectively. Changes in fair value were recorded directly as an adjustment to current earnings through non-interest expense. Bank property held for sale represents certain branch office buildings which the Company has closed and consolidated with other existing branches or acquired through various acquisitions. 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 recorded an impairment charge of $1,736 and $2,667 during the twelve month periods ending December 31, 2019 and 2018 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 : For performing loans, the fair value is determined based on a discounted cash flow analysis (income approach). The discounted cash flow was based on contractual maturity of the loan and market indications of rates, prepayment speeds, defaults and credit risk resulting in Level 3 classification. For non-performing loans, the fair value is determined based on the estimated values of the underlying collateral or individual analysis of receipts (asset approach) resulting in Level 3 classification. Accrued Interest Receivable Deposits Other Borrowings Corporate and Subordinated 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 Carrying amount Level 1 Level 2 Level 3 Total at December 31,2019 Financial assets: Cash and cash equivalents $ 490,058 $ 490,058 $ — $ — $ 490,058 Trading securities 4,987 — 4,987 — 4,987 Available for sale debt securities 1,886,724 — 1,886,724 — 1,886,724 Held to maturity debt securities 202,903 — 208,852 — 208,852 Loans held for sale 142,801 — 142,801 — 142,801 Loans, net 11,943,288 — — 11,925,693 11,925,693 Mortgage servicing assets 1,332 — 1,332 — 1,332 Mortgage banking derivatives 1,761 — 14 1,747 1,761 Interest rate swap derivatives 273,068 — 273,068 — 273,068 Accrued interest receivable 40,945 — 7,547 33,398 40,945 Financial liabilities: Deposits - without stated maturities $ 10,879,837 $ 10,879,837 $ — $ — $ 10,879,837 Deposits - with stated maturities 2,256,555 — 2,271,497 — 2,271,497 Securities sold under agreement to repurchase 93,141 — 93,141 — 93,141 Federal funds purchased and other borrowings 540,193 — 540,193 — 540,193 Corporate and subordinated debentures 71,343 — — 66,964 66,964 Mortgage banking derivatives 305 — 288 17 305 Interest rate swap derivatives 275,033 — 275,033 — 275,033 Accrued interest payable 3,998 — 3,998 — 3,998 Fair value measurements Carrying amount Level 1 Level 2 Level 3 Total at December 31,2018 Financial assets: Cash and cash equivalents $ 367,333 $ 367,333 $ — $ — $ 367,333 Trading securities 1,737 — 1,737 — 1,737 Available for sale debt securities 1,727,348 — 1,727,348 — 1,727,348 Held to maturity debt securities 216,833 — 212,179 — 212,179 Loans held for sale 40,399 — 40,399 — 40,399 Loans, net 8,300,734 — — 8,342,220 8,342,220 Mortgage servicing assets 1,565 — 1,565 — 1,565 Mortgage banking derivatives 783 — — 783 783 Interest rate swap derivatives 92,475 — 92,475 — 92,475 Accrued interest receivable 33,143 — 8,355 24,788 33,143 Financial liabilities: Deposits - without stated maturities $ 7,655,376 $ 7,655,376 $ — $ — $ 7,655,376 Deposits - with stated maturities 1,821,960 — 1,827,299 — 1,827,299 Securities sold under agreement to repurchase 57,772 — 57,772 — 57,772 Federal funds purchased and other borrowings 655,360 — 655,360 — 655,360 Corporate debentures 32,415 — — 28,621 28,621 Mortgage banking derivatives 169 — 164 5 169 Interest rate swap derivatives 92,892 — 92,892 — 92,892 Accrued interest payable 2,627 — 2,627 — 2,627

Bank Premises and Equipment

Bank Premises and Equipment	12 Months Ended
	Dec. 31, 2019
Property Plant And Equipment [Abstract]
Bank Premises and Equipment	(8 ) Bank Premises and Equipment A summary of bank premises and equipment as of December 31, 2019 and 2018 is as follows: December 31, 2019 2018 Land $ 89,973 $ 72,487 Land improvements 1,560 1,381 Buildings 174,344 130,424 Leasehold improvements 19,076 13,655 Furniture, fixtures and equipment 68,148 45,056 Construction in progress 10,821 15,491 Subtotal 363,922 278,494 Less: accumulated depreciation 67,216 51,040 Total $ 296,706 $ 227,454 Rent expense, net of rental income, for the years ended December 31, 2019, 2018 and 2017, was $7,307, $5,642 and $2,996, respectively, and is included in Occupancy Expense in the accompanying Consolidated Statements of Income and Comprehensive Income. Rental income for the years ended December 31, 2019, 2018 and 2017, was $1,792, $1,183, and $930, respectively, and is included in Occupancy Expense.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	(9 ) Goodwill and Intangible Assets Goodwill Goodwill was a result of whole bank acquisitions, all within the Company’s commercial and retail banking segment. The change in balance for goodwill during the December 31, 2019, 2018 and 2017 is as follows: 2019 2018 2017 Beginning of year $ 802,880 $ 257,683 $ 106,028 Acquired goodwill 401,537 545,197 151,655 Impairment — — — End of year $ 1,204,417 $ 802,880 $ 257,683 The Company performed a step 1 annual impairment analysis of the goodwill recorded at the commercial and retail banking (“Bank”) reporting unit as of November 30, 2019. Step 1 includes the determination of the carrying value of the reporting unit, including the existing goodwill and intangible assets, and estimating the fair value of the reporting unit. The carrying amount of the reporting unit did not exceed its fair value resulting in no impairment. Core Deposit and Trust Intangible Assets Intangible assets consist of core deposit intangibles (“CDI”) which are from either whole bank or branch acquisitions. Acquired CDI are initially measured at fair value and then amortized over a ten-year The change in balance for the CDI and Trust intangible assets during the years 2019, 2018 and 2017 is as follows: 2019 2018 2017 Beginning of year $ 66,225 $ 24,063 $ 16,209 Acquired CDI 39,900 51,945 12,424 Amortization expense on CDI and Trust (14,968 ) (9,783 ) (3,997 ) Disposal of Trust intangible asset — — (573 ) End of year $ 91,157 $ 66,225 $ 24,063 CDI intangible assets for years ended December 31, 2019 and 2018 were as follows: December 31, 2019 December 31, 2018 Gross Gross Carrying Accumulated Carrying Accumulated Amount Amortization Amount Amortization Amortized intangible assets: Core deposit intangibles $ 133,864 $ 42,707 $ 93,964 $ 27,739 Total acquired intangibles $ 133,864 $ 42,707 $ 93,964 $ 27,739 Estimated amortization expense for each of the next five years: CDI 2020 $ 14,423 2021 12,438 2022 11,083 2023 10,688 2024 9,928 Mortgage and Small Business Administration Servicing Assets Mortgage servicing assets (“MSA”) and small business administration (“SBA”) servicing assets are either originated by the Company’s commercial and retail banking business or obtained from whole bank acquisitions. The Company acquired a total of $1,581 SBA servicing assets through its acquisition of NCOM on April 1, 2019, and a total of $1,828 MSA and SBA servicing assets through its acquisition of Charter on September 1, 2018. Mortgage Servicing Assets Activity for MSA and the related valuation allowance follows: 2019 2018 Beginning of year $ 1,565 $ — Effect from acquisitions — 1,602 Changes in fair value (233 ) (37 ) End of year $ 1,332 $ 1,565 Fair value at year-end 2019 was determined using discount rates ranging from 0.4% to 1.1%, prepayment speeds ranging from 6.7% to 13.1%, depending on the stratification of the specific right, and a weighted average default rate of 0.6%. Small Business Administration Servicing Assets During the year ended December 31, 2019, the Company acquired $1,581 of SBA loans serviced for others in the acquisition of NCOM. During the year ended December 31, 2018, the Company acquired $226 of SBA loans serviced for others in the acquisition of Charter (see Note 26 “Business The Company recorded $1,062 and $235 of amortization on the SBA servicing assets during the years ended December 31, 2019 and 2018, respectively. As the SBA servicing assets from the NCOM and Charter acquisitions were assumed at fair value on April 1, 2019 and on September 1, 2018, no impairment charge has currently been assessed on these assets. SBA servicing assets totaled $3,175 and $1,388 at December 31, 2019 and 2018, respectively. The risk inherent in SBA servicing assets includes prepayments at different rates than anticipated or resolution of loans at dates not consistent with the estimated expected lives. These events would cause the value of the SBA servicing assets to decline at a faster or slower rate than originally anticipated. Activity for SBA servicing assets is as follows: 2019 2018 Beginning of year $ 1,388 $ 551 Additions 1,268 846 Effect from acquisitions 1,581 226 Amortized to expense (1,062 ) (235 ) End of year $ 3,175 $ 1,388

Deposits

Deposits	12 Months Ended
	Dec. 31, 2019
Banking And Thrift [Abstract]
Deposits	(10 ) Deposits A detail of deposits at December 31, 2019 and 2018 is as follows: December 31, Weighted Weighted Average Average Interest Interest 2019 Rate 2018 Rate Non-interest bearing deposits $ 3,929,183 — % $ 2,923,640 — % Interest bearing deposits: Interest bearing demand deposits 2,613,933 0.4 % 1,811,006 0.3 % Savings deposits 811,150 0.3 % 704,159 0.1 % Money market accounts 3,525,571 1.0 % 2,216,571 0.9 % Time deposits less than $100,000 966,040 1.7 % 871,043 1.6 % Time deposits of $100,000 or greater 1,290,515 1.9 % 950,917 1.6 % $ 13,136,392 0.7 % $ 9,477,336 0.6 % The following table presents the amount of certificate accounts at December 31, 2019, maturing during the periods reflected below: Year Amount 2020 $ 1,896,281 2021 216,494 2022 64,737 2023 46,607 2024 31,559 Thereafter 877 Total $ 2,256,555 Time deposits that meet or exceed the FDIC insurance limit of $250 at year-end 2019 and 2018 were $647,490 and $397,369, respectively. Total brokered deposits were $323,392 and $328,718 at year-end 2019 and 2018, respectively.

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	12 Months Ended
	Dec. 31, 2019
Banking And Thrift [Abstract]
Securities Sold Under Agreements to Repurchase	(11 ) Securities Sold Under Agreements to Repurchase The Company’s subsidiary bank enters into borrowing arrangements with its retail business customers by agreements to repurchase (“repurchase agreements”) under which the bank pledges investment securities owned and under its control as collateral against the one-day borrowing arrangement. At December 31, 2019 and 2018, the Company had $93,141 and $57,772 in repurchase agreements. Repurchase agreements are secured by obligations of U.S. government agencies and municipal securities with fair values of $131,394 and $64,706 at December 31, 2019 and 2018 , respectively. Any risk related to these arrangements, primarily market value changes, is minimized due to the overnight (one-day) maturity and the additional collateral pledged over the borrowed amounts. The following tables provide additional details as of December 31, 2019 and 2018. MBS Municipal Securities Securities Total As of December 31, 2019 Market value of securities pledged $ 130,942 $ 451 $ 131,394 Borrowings related to pledged amounts 92,953 188 93,141 Market value pledged as a % of borrowings 141 % 240 % 141 % MBS Municipal Securities Securities Total As of December 31, 2018 Market value of securities pledged $ 64,269 $ 437 $ 64,706 Borrowings related to pledged amounts 57,594 178 57,772 Market value pledged as a % of borrowings 112 % 246 % 112 % Information concerning repurchase agreements is summarized as follows: 2019 2018 2017 Average daily balance during the year $ 73,314 $ 54,344 $ 43,850 Average interest rate during the year 1.51 % 1.16 % 0.56 % Maximum month-end balance during the year $ 93,141 $ 59,751 $ 52,080 Weighted average interest rate at year end 1.30 % 1.66 % 0.88 %

Federal Funds Purchased

Federal Funds Purchased	12 Months Ended
	Dec. 31, 2019
Banking And Thrift [Abstract]
Federal Funds Purchased	(1 2 ) Federal Funds Purchased Federal funds purchased are overnight deposits including deposits from correspondent banks. These borrowings are included in Federal Funds Purchased on the Company’s Consolidated Balance Sheets. Information concerning these deposits is summarized as follows: 2019 2018 Average daily balance during the year $ 286,179 $ 250,499 Average interest rate during the period 2.29 % 2.02 % Maximum month-end balance during the year $ 379,193 $ 294,360 Weighted average interest rate at year end 1.68 % 2.07 %

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances and Other Borrowed Funds	12 Months Ended
	Dec. 31, 2019
Banking And Thrift [Abstract]
Federal Home Loan Bank Advances and Other Borrowed Funds	(1 3 ) Federal Home Loan Bank Advances and Other Borrowed Funds From time to time, the Company borrows either through Federal Home Loan Bank (“FHLB”) advances or one-day borrowings, other than correspondent bank deposits listed in Note 12 above. At year-end, advances from the FHLB were as follows: 2019 2018 Fixed rate advances, maturity through 01/28/2019, rates from 2.45% and 2.54%, averaging 2.50% $ — $ 200,000 Floating rate advances, rates from 1.87% and 2.65%, as of December 31, 2019 and 2018, respectively 150,000 150,000 Total $ 150,000 $ 350,000 The floating rate FHLB advance listed above for the year-end 2019 has a one-year The Company has $50,000 available in a revolving line of credit, with an interest rate of LIBOR plus 350 basis points (“bps”) and scheduled to mature on April 1, 2021. The Company had no revolving line of credit balance outstanding as of December 31, 2019 and 2018. On January 1, 2018, the Company acquired all the assets and assumed all the liabilities of Sunshine pursuant to the merger agreement, including Sunshine’s debt obligations. In March 2016, Sunshine accepted subscriptions for and sold, at 100% of their principal amount, an aggregate of $11,000 of subordinated notes (the “Notes”), on a private placement basis, to two accredited investors. The Notes bear interest at a fixed interest rate of 5.00% per year. The Notes have a term of five years, and have a maturity date of April 1, 2021. The Notes are redeemable at the option of the Company, in whole or in part, at any time, without penalty or premium, subject to any required regulatory approvals. The Federal Home Loan Bank Advances, revolving line of credit and Notes are included in Other Borrowed Funds on the Company’s Consolidated Balance Sheets.

Corporate and Subordinated Debe

Corporate and Subordinated Debentures	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Corporate and Subordinated Debentures	(1 4 ) Corporate and Subordinated Debentures In September 2003, the Company formed CenterState Banks of Florida Statutory Trust I (the “Trust”) for the purpose of issuing trust preferred securities. On September 22, 2003, the Company issued a floating rate corporate debenture in the amount of $10,000. The Trust used the proceeds from the issuance of a trust preferred security to acquire the corporate debenture. The trust preferred security essentially mirrors the corporate debenture, carrying a cumulative preferred dividend at a variable rate equal to the interest rate on the corporate debenture (three month LIBOR plus 305 basis points (“bps”)). The corporate debenture and the trust preferred security each have 30-year In May 2004, Valrico Bancorp Inc. (“VBI”) formed Valrico Capital Statutory Trust (“Valrico Trust”) for the purpose of issuing trust preferred securities. On September 8, 2004, VBI issued a floating rate corporate debenture in the amount of $2,500. The Trust used the proceeds from the issuance of a trust preferred security to acquire the corporate debenture. On April 2, 2007, the Company acquired all the assets and assumed all the liabilities of VBI pursuant to the merger agreement, including VBI’s corporate debenture and related trust preferred security discussed above. The trust preferred security essentially mirrors the corporate debenture, carrying a cumulative preferred dividend at a variable rate equal to the interest rate on the corporate debenture (three month LIBOR plus 270 bps). The corporate debenture and the trust preferred security each have 30-year In September 2003, Federal Trust Corporation (“FTC”) formed Federal Trust Statutory I (“FTC Trust”) for the purpose of issuing trust preferred securities. On September 17, 2003, FTC issued a floating rate corporate debenture in the amount of $5,000. The Trust used the proceeds from the issuance of a trust preferred security to acquire the corporate debenture. In November 2011, the Company acquired certain assets and assumed certain liabilities of FTC from The Hartford Financial Services Group, Inc. (“Hartford”) pursuant to an acquisition agreement, including FTC’s corporate debenture and related trust preferred security issued through FTC’s finance subsidiary FTC Trust. The trust preferred security essentially mirrors the corporate debenture, carrying a cumulative preferred dividend at a variable rate equal to the interest rate on the corporate debenture (three month LIBOR plus 295 bps). The corporate debenture and the trust preferred security each have 30-year In December 2006, GBI formed Gulfstream Bancshares Capital Trust II (“GBI Trust II”) for the purpose of issuing trust preferred securities. On December 28, 2006, GBI issued a floating rate corporate debenture in the amount of $3,000. The Trust used the proceeds from the issuance of a trust preferred security to acquire the corporate debenture. The trust preferred security essentially mirrors the corporate debenture, carrying a cumulative preferred dividend at a variable rate equal to the interest rate on the corporate debenture (three month LIBOR plus 170 bps). The rate is subject to change quarterly. The corporate debenture and the trust preferred security each have 30-year On January 17, 2014, the Company acquired all the assets and assumed all the liabilities of GBI by merger, including GBI’s corporate debenture and related trust preferred security discussed above. In July 2006, Hometown formed Homestead Statutory Trust I (“Homestead Trust I”) for the purpose of issuing trust preferred securities. On July 17, 2006, Hometown issued a floating rate corporate debenture in the amount of $16,000. The Trust used the proceeds from the issuance of a trust preferred security to acquire the corporate debenture. The trust preferred security essentially mirrors the corporate debenture, carrying a cumulative preferred dividend at a variable rate equal to the interest rate on the corporate debenture (three month LIBOR plus 165 bps). The rate is subject to change quarterly. The corporate debenture and the trust preferred security each have 30-year In January 2018, the Company assumed BSA Financial Statutory Trust I (“BSA”) and MRCB Statutory Trust II (“MRCB”) from its acquisition of HCBF. These Trusts were acquired by HCBF in prior acquisitions completed by HCBF. The issued floating rate corporate debentures related to BSA and MRCB were in the amounts of $5,000 and $3,000, respectively. The trust preferred security essentially mirror the corporate debentures, carrying a cumulative preferred dividend at a variable rate equal to the interest rate on the corporate debentures (three month LIBOR plus 155 bps and LIBOR plus 160 bps, respectively). The rates are subject to change quarterly. The corporate debentures and the trust preferred securities each have 30-year In September 2018, the Company assumed CBS Financial Capital Trust I (“CBS Trust I”) and CBS Financial Capital Trust II (“CBS Trust II”) pursuant to its acquisition of Charter, in the amounts of $4,000 and $5,000, respectively. CBS Trust I and CBS Trust II were subsequently redeemed in December 2018, at par with no gains or losses realized on the termination of debt, with prior approval by the Federal Reserve. On April 1, 2019, the Company acquired all the assets and assumed all the liabilities of NCOM pursuant to the merger agreement, including NCOM’s debt obligations. On May 19, 2016, NCOM completed the underwritten public offering of $25,000 of its unsecured 6.0% fixed-to-floating rate Notes due June 1, 2026. The Notes bear interest at a fixed rate of 6.0% per year, from, and including, May 19, 2016, to, but excluding, June 1, 2021. On June 1, 2021, the Notes convert to a floating rate equal to three-month LIBOR plus 479 basis points. The Notes may be redeemed by the Company after June 1, 2021. In addition, NCOM, from its Landmark Bancshares, Inc. acquisition, had assumed $13,000 of unsecured 6.5% fixed-to-floating rate Notes due June 30, 2027. The Notes bear interest at a fixed rate of 6.5% per year, to, but excluding, June 30, 2022. On June 30, 2022, the Notes convert to a floating rate equal to three-month LIBOR plus 467 basis points. As the Company’s total assets exceeded $15 billion during the second quarter of 2019, the Company has treated the above mentioned corporate and subordinated debentures as Tier II capital up to the maximum amount allowed under the Federal Reserve guidelines for federal regulatory purposes.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	(15) Income Taxes Allocation of federal and state income tax expense between current and deferred portions for the years ended December 31, 2019, 2018 and 2017, is as follows: Current Deferred Total December 31, 2019: Federal $ 34,182 $ 18,510 $ 52,692 State 9,275 5,731 15,006 $ 43,457 $ 24,241 $ 67,698 December 31, 2018: Federal $ 14,273 $ 16,843 $ 31,116 State 5,240 4,668 9,908 $ 19,513 $ 21,511 $ 41,024 December 31, 2017: Federal $ 18,243 $ 29,393 $ 47,636 State 4,045 1,799 5,844 $ 22,288 $ 31,192 $ 53,480 The tax effect of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2019 and 2018, are presented below: December 31, 2019 2018 Deferred tax assets: Allowance for loan losses $ 10,178 $ 10,079 Stock based compensation 2,242 1,701 Deferred compensation 2,782 2,235 Impairment expenses 2,222 1,334 Net operating loss carryforward 19,812 18,313 Other real estate owned expenses 129 177 Fair value adjustments 6,979 17,929 Nonaccrual interest 2,996 2,890 Unrealized loss on interest rate swap 205 — Unrealized loss on available for sale debt securities — 7,611 Other 973 — Total deferred tax assets 48,518 62,269 Deferred tax liabilities: Premises and equipment, due to differences in depreciation methods and useful lives (8,702 ) (8,145 ) Deferred loan costs, net (1,131 ) (683 ) Unrealized gain on available for sale debt securities (7,685 ) — Investment in pass-through entity (184 ) — Prepaid expenses (2,030 ) (1,608 ) Like kind exchange — (197 ) Accretion of discounts on investments — (67 ) Other — (107 ) Total deferred tax liabilities (19,732 ) (10,807 ) Net deferred tax asset $ 28,786 $ 51,462 As a result of the acquisition of First Southern on June 1, 2014, the Company obtained net operating loss carryforwards of approximately $57,375 which are subject to an Internal Revenue Code (“IRC”) Section 382 annual limitation of approximately $6,487 per year. The Company obtained net operating loss carryforwards of approximately $11,526 and $8,763 as a result of the acquisitions of Community and Hometown, respectively, on March 1, 2016 which are also subject to IRC Section 382 limitations of approximately $1,722 and $507, respectively. The Company obtained net operating loss carryforwards of approximately $22,529 and $14,003 as a result of the acquisitions of Sunshine and HCBF, respectively, on January 1, 2018 which are also subject to IRC Section 382 limitations of approximately $3,682 and $1,101, respectively. On April 1, 2019, the Company acquired approximately $35,712 of net operating loss carryforwards pursuant to its acquisition of NCOM, which are subject to IRC Section 382 annual limitations of varying amounts but all are expected to be utilized by December 31, 2026. At December 31, 2019, total net operating losses approximate $79,204, which includes $24,322 of net operating loss carry forwards generated subsequent to December 31, 2017 by institutions acquired by the Company as noted above. Effective January 1, 2018, net operating losses generated on January 1, 2018 and forward are no longer subject to a 20-year carryforward period and are carried indefinitely until fully utilized. Excluding the net operating losses not subject to expiration, the Company had approximately $54,882 of net operating loss carryforwards at December 31, 2019, which will begin to expire as follows: 2027 $ 1,318 2028 4,794 2029 7,060 2030 11,960 2031 5,524 2032 6,841 2033 13,350 2035 759 2036 3,276 $ 54,882 As a result of the enactment of the Tax Act on December 22, 2017, the Company evaluated its deferred tax assets and deferred tax liabilities to account for the future impact of lower corporate tax rates on its deferred tax assets. The reduction in the federal corporate tax rate resulted in a one-time charge to the Company’s earnings and reduction to its net deferred tax assets of approximately $18,575, which was recorded in 2017. During 2019, the Company recorded a one-time charge to its net deferred tax asset of approximately $987 to reflect a state income tax rate reduction in Florida and Georgia effective January 1, 2019. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. In performing this analysis, the Company considers all evidence currently available, both positive and negative, in determining whether based on the weight of that evidence, it is more likely than not the deferred tax asset will be realized. Based on management’s analysis, it was determined that it is more likely than not that the net deferred tax asset, net of the one-time charge mentioned above, will be realized as of December 31, 2019 and 2018. The Company and its subsidiaries are subject to U.S. federal income tax as well as income tax of the states of Florida, Georgia, Alabama, California, Colorado, North Carolina and Tennessee. CSFL Insurance Corp. files a tax return in South Carolina. The Company is no longer subject to examination by taxing authorities for the years before 2016. The Company has not recorded any material interest or penalties on its income tax liabilities for the years 2019, 2018 and 2017. A reconciliation between the actual tax expense and the “expected” tax expense, computed by applying the U.S. federal corporate rate of 21 percent for 2019 and 2018 and 35 percent for 2017 is as follows: December 31, 2019 2018 2017 “Expected” tax expense $ 61,550 $ 41,466 $ 38,246 Tax exempt interest, net (3,661 ) (3,177 ) (4,104 ) Bank owned life insurance (1,834 ) (1,167 ) (1,251 ) State income taxes, net of federal income tax benefits 11,855 7,827 4,077 Stock based compensation 4 17 40 Merger and acquisition related expenses 348 610 1,049 Excess tax benefit from stock based compensation (838 ) (5,095 ) (3,007 ) Revaluation of net deferred tax asset due to change in federal income tax rate — — 18,575 Other, net 274 543 (145 ) $ 67,698 $ 41,024 $ 53,480

Related-Party Transactions

Related-Party Transactions	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Related-Party Transactions	(1 6 ) Related-Party Transactions Loans to principal officers, directors, and their affiliates during 2019 and 2018 were as follows: 2019 2018 Beginning balance $ 48,426 $ 30,458 New loans and advances on existing loans 1,605 39,183 Repayments (4,020 ) (21,215 ) Ending balance $ 46,011 $ 48,426 At December 31, 2019 and 2018 principal officers, directors, and their affiliates had $12,812 and $10,820, respectively, of available lines of credit. Deposits from principal officers, directors, and their affiliates at year-end 2019 and 2018 were approximately $16,198 and $6,739, respectively.

Regulatory Capital Matters

Regulatory Capital Matters	12 Months Ended
	Dec. 31, 2019
Banking And Thrift [Abstract]
Regulatory Capital Matters	(1 7 ) Regulatory Capital Matters The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities and certain off-balance-sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. The final rules implementing Basel Committee on Banking Supervision’s capital guidelines for U.S. banks (Basel III rules) became effective for the Company on January 1, 2015 with full compliance with all of the requirements being phased in over a multi-year schedule, and fully phased in by January 1, 2019. Under these rules, banks are required to maintain a minimum CET1 ratio of 4.5%, a minimum Tier 1 capital to risk-weighted assets of 6%, a total risk-based capital ratio of 8%, and a minimum leverage capital ratio of 4%. In addition, the rules require a capital conservation buffer of up to 2.5 % above each of CET1, tier 1, and total risk-based capital which must be met for a bank to be able to pay dividends, engage in share buybacks or make discretionary bonus payments to executive management without restriction. This capital conservation buffer is being phased in over a four-year period starting on January 1, 2016. The capital conservation buffer was % as of January 1, 2019 and 1.875 % in 2018 . F ully implemented, a banking organization would need to maintain a CET1 capital ratio of at least 7 %, a total Tier 1 capital ratio of at least 8.5 % and a total risk-based capital ratio of at least 10.5 %. The net unrealized gain or loss on available for sale securities is not included in computing regulatory capital. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the table below) of total capital, Tier I capital and CET1 (as defined in the regulations) to risk-weighted assets. Management believes, as of December 31, 2019, that the Company and the Bank meet all capital adequacy requirements to which they are subject. As of December 31, 2019 and 2018, the most recent notifications from the Office of Comptroller of the Currency (“OCC”) categorized the Bank as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as “well capitalized,” the Bank must maintain total risk-based, Tier I risk-based, common equity Tier 1 risk-based and Tier I leverage ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed the institution’s category. A summary of actual, required, and capital levels necessary for capital adequacy purposes for the Company as of December 31, 2019 and 2018, are presented in the table below. The ratios for capital adequacy purposes do not include capital conservation buffer requirements. To be well capitalized under For capital prompt corrective Actual adequacy purposes action provision Amount Ratio Amount Ratio Amount Ratio December 31, 2019 Total capital (to risk weighted assets) $ 1,672,911 12.2% $ 1,097,448 >8.0% n/a n/a Tier 1 capital (to risk weighted assets) 1,555,756 11.3% 823,086 >6.0% n/a n/a Common equity tier 1 capital (to risk weighted assets) 1,555,756 11.3% 617,315 >4.5% n/a n/a Tier 1 capital (to average assets) 1,555,756 9.7% 638,866 >4.0% n/a n/a December 31, 2018 Total capital (to risk weighted assets) $ 1,183,229 12.7% $ 745,543 >8.0% n/a n/a Tier 1 capital (to risk weighted assets) 1,143,459 12.3% 559,157 >6.0% n/a n/a Common equity tier 1 capital (to risk weighted assets) 1,104,959 11.9% 419,368 >4.5% n/a n/a Tier 1 capital (to average assets) 1,143,459 10.0% 455,561 >4.0% n/a n/a A summary of actual, required, and capital levels necessary for capital adequacy purposes in the case of the Company’s subsidiary bank as of December 31, 2019 and 2018, are presented in the table below. The ratios for capital adequacy purposes do not include capital conservation buffer requirements. To be well capitalized under For capital prompt corrective Actual adequacy purposes action provision Amount Ratio Amount Ratio Amount Ratio December 31, 2019 Total capital (to risk weighted assets) $ 1,670,678 12.2% $ 1,097,258 >8.0% $ 1,371,572 >10.0% Tier 1 capital (to risk weighted assets) 1,630,026 11.9% 822,943 >6.0% 1,097,258 >8.0% Common equity tier 1 capital (to risk weighted assets) 1,630,026 11.9% 617,207 >4.5% 891,522 >6.5% Tier 1 capital (to average assets) 1,630,026 10.2% 638,628 >4.0% 798,285 >5.0% December 31, 2018 Total capital (to risk weighted assets) $ 1,177,082 12.6% $ 745,003 >8.0% $ 931,254 >10.0% Tier 1 capital (to risk weighted assets) 1,137,315 12.2% 558,753 >6.0% 745,003 >8.0% Common equity tier 1 capital (to risk weighted assets) 1,137,315 12.2% 419,064 >4.5% 605,315 >6.5% Tier 1 capital (to average assets) 1,137,315 10.0% 455,515 >4.0% 569,394 >5.0%

Dividends and Share Repurchases

Dividends and Share Repurchases	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Dividends and Share Repurchases	(1 8 ) Dividends and Share Repurchases The Company declared and paid cash dividends on its common stock of $52,400, $35,906 and $13,878 during the years ended December 31, 2019, 2018 and 2017 respectively. Banking regulations limit the amount of dividends that may be paid by the subsidiary banks to the Company without prior approval of the Bank’s regulatory agency. The Company received a $141,000 and $68,000 dividend from its subsidiary bank in 2019 and 2018, respectively. At December 31, 2019, dividends from the subsidiary bank available to be paid to the Company, without prior approval of the Bank’s regulatory agency, was $177,208, subject to the Bank meeting or exceeding regulatory capital requirements. In September 2017, the Company’s Board of Directors authorized a repurchase program to acquire up to 3,000,000 shares of its outstanding common stock. In May 2019, the Board of Directors approved and reset the number of shares available to be repurchased under the 2017 stock repurchase program to 6,500,000 and extended the program for a two-year period ending on April 25, 2021. Under the announced stock repurchase program, the Company repurchased 5,733,042 shares at cost of $132,077 during the year ended December 31, 2019 and 38,496 shares at a cost of $1,027 during the year ended December 31, 2018. The Company repurchased 45,236 shares at a cost of $1,131 during the year ended December 31, 2017. In January 2020, the Board of Directors approved a new program to replace the current program and authorizes the Company to repurchase up to 6,500,000 of the its common stock for a two-year period ending on January 16, 2022. The Company is not obligated to repurchase any additional shares under the 2020 Stock Repurchase Program.

Equity-Based Compensation

Equity-Based Compensation	12 Months Ended
	Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-Based Compensation	(1 9 ) Equity-Based Compensation The Company assumed the obligations of NCOM under various equity incentive plan’s pursuant to the closing on April 1, 2019 by CenterState of the merger of NCOM with and into CenterState. All of the NCOM stock options and warrants awarded and outstanding pursuant to the assumed NCOM plans at the merger closing date were converted to stock options and warrants for 487,365 of the Company’s common shares with an average exercise price of $10.99 per share. At December 31, 2019, there were options and warrants outstanding for 343,418 shares of the Company’s common stock with an average exercise price of $11.32 per share and an average remaining contractual life of approximately 4.7 years. The Company assumed the obligations of Sunshine under Sunshine’s 2015 Equity Incentive Plan (“Sunshine Plan”) pursuant to the closing on January 1, 2018 by CenterState of the merger of Sunshine with and into CenterState. All of the Sunshine stock options awarded pursuant to the Sunshine Plan outstanding at the merger closing date were converted to stock options for 590,345 of the Company’s common shares with an average exercise price of $14.84 per share. At December 31, 2019, there were options outstanding for 14,240 shares of the Company’s common stock with an average exercise price of $15.91 per share and an average remaining contractual life of approximately 6.3 years. The Company assumed the obligations of HCBF under HCBF’s 2010 Amended and Restated Stock Incentive Plan (the “HCBF Plan”), pursuant to the closing on January 1, 2018 by CenterState of the merger of HCBF with and into CenterState. All of the HCBF stock options awarded pursuant to the HCBF Plan outstanding at the merger closing date were converted to stock options for 1,621,543 of the Company’s common shares with an average exercise price of $14.80 per share. At December 31, 2019, there were options outstanding for 63,470 shares of the Company’s common stock with an average exercise price of $13.96 per share and an average remaining contractual life of approximately 5.3 years. The Company assumed the obligations of Gateway under the Gateway Officers’ and Employees’ Stock Option Plan and the Gateway Directors’ Stock Option Plan (collectively, the “Gateway Plans”) pursuant to the closing on May 1, 2017 by CenterState of the merger of Gateway with and into CenterState. All of the Gateway stock options awarded pursuant to the Gateway Plans outstanding at the merger closing date were converted to stock options for 1,150,517 of the Company’s common shares with an average exercise price of $11.32 per share. At December 31, 2019, there were options outstanding for 191,828 shares of the Company’s common stock with an average exercise price of $10.53 per share and an average remaining contractual life of approximately 2.7 years. The Company assumed the obligations of GBI under the Gulfstream 2009 Stock Option Plan, the Gulfstream Officers’ and Employees’ Stock Option Plan and the Gulfstream Directors’ Stock Option Plan (collectively, the “Gulfstream Plans”) pursuant to the closing on January 17, 2014 by CenterState of the merger of Gulfstream with and into CenterState. All of the Gulfstream stock options awarded pursuant to the Gulfstream Plans outstanding at the merger closing date were converted to stock options for 774,104 of the Company’s common shares with an average exercise price of $6.99 per share. At December 31, 2019, there were options outstanding for 40,000 shares of the Company’s common stock with an average exercise price of $6.15 per share and an average remaining contractual life of approximately 1.9 years. On April 26, 2018, the Company’s shareholders approved the CenterState Bank Corporation 2018 Equity Incentive Plan (the “2018 Plan”). The 2018 Plan replaces the 2013 Plan discussed below. The 2018 Plan authorizes the issuance of up to 2,200,000 shares through the 2028 expiration of the plan. No more than $150 in grants of shares may be issued to any director in any one fiscal year. The Company’s Board of Directors froze the Company’s 2013 Equity Incentive Plan whereby no additional future grants and/or awards will be awarded pursuant to that plan effective with the shareholder approval of the 2018 Plan. During 2019 the Company did no t grant any incentive stock options to its employees. The Company awarded 120,572 shares of Restricted Stock (“RSAs”) during 2019 with an average fair value of $ 26.33 per share at the date of grant. These restricted stock awards vest over periods ranging from two to five years . The Company awarded Performance Share Units (“PSUs”) during 2019 pursuant to the Company’s Long-Term Incentive Plan as described in the Company’s 2019 Proxy Statement. These PSUs will cliff vest on January 1, 202 3 . The units may be converted into common shares based upon the Company’s return on average tangible common equity compared to its peer group and the Company’s tangible book value per share growth over a three-year period ending January 1, 202 3 . The range of the units that may vest in the future is a minimum of 0 and a maximum of 181,402 with an expected target of 120,945 shares. The Company also awarded 84,383 Restricted Share Units (“RSUs”) during 2019 with an average fair value of $ 21.09 per unit at the date of grant. The RSUs will vest at a rate of one third each January 1, 20 2 1 , 202 2 and 202 3 . In addition, the Company issued 33,536 shares to non-employee directors in lieu of ca sh for director fees during 2019 . At December 31, 2019 , there were a total of shares available for future grants pursuant to the 20 18 Plan, assuming maximum future vesting of PSUs outstanding. On April 25, 2013, the Company’s shareholders approved the CenterState 2013 Equity Incentive Plan (the “2013 Plan”). The 2013 Plan replaced the 2007 Plan. The 2013 Plan authorized the issuance of up to 1,600,000 shares of the Company stock. In 2019, the 2013 Plan was frozen whereby no additional grants and/or awards were awarded pursuant to this plan subsequent to April 2018. On April 24, 2007, the Company’s shareholders approved the CenterState 2007 Equity Incentive Plan (the “2007 Plan”) and approved an amendment to the 2007 Plan on April 28, 2009. The 2007 Plan, as amended, authorized the issuance of up to 1,350,000 shares of the Company stock. In 2013, the 2007 Plan was frozen whereby no additional grants and/or awards were awarded pursuant to this plan subsequent to April 2013. The Company’s stock-based compensation consists of stock options, RSAs, RSUs and PSUs. During the twelve-month periods ended December 31, 2019, 2018 and 2017, the Company recognized total stock-based compensation expense as listed in the table below. 2019 2018 2017 Stock option expense $ 19 $ 83 $ 115 RSA expense 3,329 2,922 3,560 RSU Expense 843 538 287 PSU expense 958 650 624 Total stock-based compensation expense $ 5,149 $ 4,193 $ 4,586 There is no income tax benefit provided for in the Company’s tax provision for qualified incentive stock options. The Company receives a tax benefit when a non-qualified stock option is exercised. The total income tax benefit related to the exercise of non-qualified stock options was approximately $723, $5,373 and $1,545 during the twelve-month periods ending December 31, 2019, 2018 and 2017, respectively. The Company provided an income tax benefit in its tax provision for RSA, RSU and PSU expenses of approximately $1,284, $1,042 and $1,725 during the twelve-month periods ending December 31, 2019, 2018 and 2017, respectively. As of December 31, 2019, the total remaining unrecognized compensation cost related to non-vested stock options was approximately $22 and will be recognized over the next 3 years. The weighted average period over which this expense is expected to be recognized is approximately 1.4 years . As of December 31, 2019, the total remaining unrecognized compensation cost related to non-vested RSAs, net of estimated forfeitures, was approximately $3,758 and will be recognized over the next 8 years. The weighted average period over which this expense is expected to be recognized is approximately 1.9 years. As of December 31, 2019, the total remaining unrecognized compensation cost related to non-vested PSUs, net of estimated forfeitures, was approximately $3,272 and will be recognized over the next 3 years. The weighted average period over which this expense is expected to be recognized is approximately 1.8 years. As of December 31, 2019, the total remaining unrecognized compensation cost related to non-vested RSUs, net of estimated forfeitures, was approximately $2,533 and will be recognized over the next 3 years. The weighted average period over which this expense is expected to be recognized is approximately 1.8 years. The Company did not grant any stock options during 2017, 2018 and 2019. However, the Company converted all outstanding Gateway stock options into CenterState options for 1,150,517 shares of common stock on the May 1, 2017 acquisition date pursuant to the Company’s agreement to acquire Gateway. The Company also converted all outstanding Sunshine and HCBF stock options into CenterState options for 590,345 and 1,621,543 shares of common stock, respectively, on the January 1, 2018 acquisition date pursuant to the Company’s respective agreements to acquire Sunshine and HCBF. The Company also converted all outstanding NCOM stock options and warrants into CenterState options and warrants for 487,365 shares of common stock on the April 1, 2019 acquisition date pursuant to the Company’s agreement to acquire NCOM. The estimated fair value of options gran ted, or assumed in the case of Gateway , Sunshine , HCBF and NCOM , during these periods were calculated as of the grant date, or the acquisition date in the case of Gateway , Sunshine , HCBF and NCOM , using the Black-Scholes option-pricing model. The Company determined the expected life of the stock options using the simplified method approach allowed for plain-vanilla share options as described in SAB 107. The risk-free interest rate is based on the U.S. Treasury yield curve in effect as of the grant date. Expected volatility was determined using historical volatility. ASC 718 requires the recognition of stock-based compensation for the number of awards that are ultimately expected to vest. However, with the adoption of ASU 2016-09 in 2017, the Company made an entity-wide accounting policy election to account for forfeitures when they occur. The weighted-average estimated fair value of stock options granted, or acquired in the case of NCOM, during the twelve-month period ended December 31, 2019 was $10.99 per share. The table below presents information related to stock option activity for the years ended December 31, 2019, 2018 and 2017: 2019 2018 2017 Total intrinsic value of stock options exercised $ 4,827 $ 1,492 $ 8,039 Net proceeds from stock options exercised $ 3,101 $ 14,707 $ 6,715 Gross income tax benefit from the exercise of stock options $ 723 $ 5,373 $ 1,545 A summary of stock option and warrant activity for the years ended December 31, 2019, 2018 and 2017 is as follows: December 31, 2019 December 31, 2018 December 31, 2017 Weighted- Weighted- Weighted- Number of Average Average Average Options and Exercise Number of Exercise Number of Exercise Warrants Price Options Price Options Price Outstanding, beginning of period 655,261 $ 11.26 1,119,483 $ 11.26 623,490 $ 12.30 Options assumed pursuant to acquisition of (note 1): Gateway — — — — 1,150,517 11.32 HCBF — — 1,621,543 14.80 — — Sunshine — — 590,345 14.84 — — NCOM 487,365 10.99 — — — — Exercised (356,366 ) 10.82 (1,793,339 ) 13.61 (598,039 ) 12.11 Forfeited (102,404 ) 13.55 (882,771 ) 15.37 (56,485 ) 15.00 Outstanding, end of period 683,856 $ 10.94 655,261 $ 11.26 1,119,483 $ 11.26 n ote 1: Pursuant to the Company’s respective agreements to acquire Gateway (on May 1, 2017), Sunshine and HCBF (both on January 1, 2018) and NCOM (on April 1, 2019), all outstanding Gateway, Sunshine, HCBF and NCOM stock options and warrants were converted to CenterState stock options and warrants as of the acquisition date. Weighted- Weighted- Average Average Aggregate Number of Exercise Contractual Intrinsic Options Price Term Value Options outstanding, December 31, 2019 683,856 $ 10.94 4.0 years $ 9,599 Options fully vested and expected to vest, December 31, 2019 681,718 $ 10.96 4.0 years $ 9,561 Options exercisable, December 31, 2019 675,356 $ 10.99 4.0 years $ 9,447 At December 31, 2019, there were restricted stock awards (“RSAs”) for 334,779 shares of the Company’s common stock outstanding and not vested. Of this amount 32,500 restricted shares have been issued and included in the Company’s total common stock outstanding, but have not vested as of December 31, 2019. The remaining 302,279 represent common shares to be issued at the end of their respective vesting period. A summary of the RSA activity for the years ended December 31, 2019, 2018 and 2017 is presented in the table below. 2019 2018 2017 Number Number Weighted- Number Number Weighted- Number Number Weighted- of RSAs of RSAs average of RSAs of RSAs average of RSAs of RSAs average underlying underlying Total fair value underlying underlying Total fair value underlying underlying Total fair value shares not shares number at grant shares not shares number at grant shares not shares number at grant issued issued of RSAs date issued issued of RSAs date issued issued of RSAs date Outstanding, beginning period 339,766 50,600 390,366 $ 19.10 489,424 69,700 559,124 $ 15.89 572,064 127,901 699,965 $ 12.20 Granted 120,572 — 120,572 $ 26.33 67,502 — 67,502 $ 26.77 148,232 — 148,232 $ 24.94 Vested (149,318 ) (17,100 ) (166,418 ) $ 18.99 (214,847 ) (19,100 ) (233,947 ) $ 13.65 (226,606 ) (58,201 ) (284,807 ) $ 11.52 Forfeited (8,741 ) (1,000 ) (9,741 ) $ 22.78 (2,313 ) — (2,313 ) $ 18.55 (4,266 ) — (4,266 ) $ 15.76 Outstanding, end of period 302,279 32,500 334,779 $ 21.65 339,766 50,600 390,366 $ 19.10 489,424 69,700 559,124 $ 15.89 In September 2014, the Company initiated a Long-Term Incentive Plan (“LTI”) that includes a Performance Share Unit (“PSU”) award that could be awarded in PSUs, which can eventually be converted to common stock, based on the Company’s relative return on average tangible common equity and tangible book value per share growth as compared to a peer group of similar companies selected by the Company’s Compensation Committee over a 39-month period beginning in September of each grant year. The Company awarded similar PSUs in 2017, 2018 and 2019. In 2019, a total of 38,107 PSUs were approved by the Company’s Compensation Committee pursuant to the 2015 LTI plan. The PSUs will be issued in the form of common stock at the end of the two-year mandatory hold period which ends in February 2021. The Company expects to recognize an expense of $687, $1,051 and $2,559 over the vesting period for PSUs granted in 2017, 2018 and 2019, respectively. The expense recognized during 2019 for all PSUs awarded pursuant to all LTI plans was $892. In September 2016, the Company also awarded PSUs pursuant to a productive incentive plan to one of its divisions that could will be converted to the Company’s common stock based upon the division’s financial performance over three and four year periods ending August 31, 2019 and 2020, respectively. In 2019, a total of 12,000 shares of the Company’s common stock were issued pursuant to the vesting of the three-year The Company awarded RSUs during September 2017, 2018 and 2019 pursuant to its LTI plans as mentioned above that could eventually be converted into the Company’s common stock. The Company expects to recognize an expense of $720, $1,107 and $1,880 for the RSUs awarded in 2017, 2018 and 2019, respectively. Generally, the RSUs will vest at a rate of one third each January 1 st A summary of the RSU activity for the years ended December 31, 2019, 2018 and 2017 is presented in the table below. December 31, 2019 December 31, 2018 December 31, 2017 Weighted- Weighted- Weighted- average average average fair value fair value fair value Number of at grant Number of at grant Number of at grant Units date Units date Units date Outstanding, beginning of period 128,447 $ 20.00 86,817 $ 17.00 54,376 $ 14.00 Granted 84,383 21.09 41,630 26.60 32,441 22.19 Vested and issued (8,547 ) 12.22 — — — — Forfeited (2,622 ) 23.45 — — — — Outstanding, end of period 201,661 $ 21.00 128,447 $ 20.00 86,817 $ 17.00

Employee Benefit Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plan	( 20 ) Employee Benefit Plan Substantially all of the Company’s employees are covered under its 401(k) defined contribution retirement plan. Effective January 1, 2019, the Company amended its 401(k) defined contribution retirement plan’s participation eligibility requirement to the first month following the date of employment. Prior to the amendment, employees were eligible to participate in the plan after completing six months of continuous employment. The Company contributes an amount equal to a certain percentage of the employees’ contributions based on the discretion of the Board of Directors. In addition, the Company may also make additional contributions to the plan each year, subject to profitability and other factors, and based solely on the discretion of the Board of Directors. For the years ended December 31, 2019, 2018 and 2017, the Company’s contributions to the plan were $5,598 , $3,444 and $2,249 , respectively, which are included in S alary , Wages and Employee B enefits on the Consolidated Statements of Income and Comprehensive Income . In 2008, the Company entered into a salary continuation agreement with its then chief executive officer. Five additional Company executive officers entered into salary continuation agreements during 2010. In 2007, an additional four pre-existing salary continuation agreements with certain Valrico State Bank’s executive officers were assumed as part of the acquisition. In 2018, the Company assumed pre-existing supplemental executive retirement plan agreements pursuant to the acquisition of Charter. In 2019, the Company assumed pre-existing supplemental executive retirement plan agreements pursuant to the acquisition of NCOM. In 2007, the Company entered into deferred compensation arrangements, through Rabbi Trust agreements, with two Valrico State Bank’s executive officers pursuant to the acquisition. The Rabbi Trust asset is included in other assets, and the related deferred compensation payable is included in other liabilities. In 2018, one of the executive officers retired and received the applicable funds from the agreement. The Rabbi Trust asset and the related deferred compensation payable at December 31, 2019, 2018 and 2017 were $339, $307 and $1,761, respectively. Earnings from the Rabbi Trust increase the asset and increase the deferred compensation payable. Losses from the Rabbi Trust decrease the asset and decrease the deferred compensation payable. There was no net income statement effect other than the administration expenses of the Trust which approximates $5 per year.

Parent Company Only Financial S

Parent Company Only Financial Statements	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Parent Company Only Financial Statements	(2 1 ) Parent Company Only Financial Statements Condensed financial statements of CenterState Bank Corporation (parent company only) are as follows: Condensed Balance Sheet December 31, 2019 and 2018 2019 2018 Assets: Cash and due from banks $ 5,168 $ 1,338 Inter-company receivable from bank subsidiary — 2,340 Investment in wholly-owned bank subsidiary 2,967,040 1,999,963 Investment in other wholly-owned subsidiary 3,431 2,761 Prepaid expenses and other assets 5,850 10,506 Total assets $ 2,981,489 $ 2,016,908 Liabilities: Accounts payable and accrued expenses $ 2,428 $ 2,149 Other borrowings 49,577 11,000 Corporate debenture 32,766 32,415 Total liabilities 84,771 45,564 Stockholders’ Equity: Common stock 1,252 957 Additional paid-in capital 2,407,385 1,699,031 Retained earnings 465,680 293,777 Accumulated other comprehensive income 22,401 (22,421 ) Total stockholders’ equity 2,896,718 1,971,344 Total liabilities and stockholders' equity $ 2,981,489 $ 2,016,908 Condensed Statements of Operations Years ended December 31, 2019, 2018 and 2017 2019 2018 2017 Dividend income $ 144,209 $ 68,000 $ 10,000 Other income — 8 — Interest expense (4,374 ) (3,415 ) (1,363 ) Operating expenses (5,372 ) (3,988 ) (3,960 ) Income before equity in undistributed income of subsidiaries 134,463 60,605 4,677 Equity in undistributed income of subsidiaries 87,898 88,532 48,760 Net income before income tax benefit 222,361 149,137 53,437 Income tax benefit (3,035 ) (7,298 ) (2,358 ) Net income $ 225,396 $ 156,435 $ 55,795 Condensed Statements of Cash Flows Years ended December 31, 2019, 2018 and 2017 2019 2018 2017 Cash flows from operating activities: Net income $ 225,396 $ 156,435 $ 55,795 Adjustments to reconcile net income to net cash used in operating activities: Undistributed net earnings of subsidiaries (87,898 ) (88,532 ) (48,760 ) (Decrease) increase in payables and accrued expenses (875 ) (13,385 ) 463 Decrease (increase) in other assets 9,783 3,998 (40,369 ) Stock based compensation expense — — 1,048 Net cash flows provided by (used in) operating activities 146,406 58,516 (31,823 ) Cash flows from investing activities: Inter-company receivables from subsidiary banks 3,143 (473 ) 25,145 Net cash from bank acquisition 34,941 (36,037 ) (42,601 ) Investment in subsidiaries — — (25,000 ) Cash payments to shareholders (84 ) 19,339 (90 ) Net cash flows provided by (used in) investing activities 38,000 (17,171 ) (42,546 ) Cash flows from financing activities: Stock options exercised, net of tax benefit 3,101 14,707 6,715 Stock repurchase (132,077 ) (1,027 ) (1,131 ) Stock issuance 800 650 — (Decrease) increase in other borrowings — (20,000 ) 20,000 Proceeds from stock offering, net of offering costs — — 63,262 Dividends paid to shareholders (52,400 ) (35,906 ) (13,878 ) Net cash flows (used in) provided by financing activities (180,576 ) (41,576 ) 74,968 Net increase (decrease) in cash and cash equivalent 3,830 (231 ) 599 Cash and cash equivalents at beginning of year 1,338 1,569 970 Cash and cash equivalents at end of year $ 5,168 $ 1,338 $ 1,569

Credit Commitments

Credit Commitments	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Credit Commitments	(2 2 ) Credit Commitments The Company has outstanding at any time a significant number of commitments to extend credit. These arrangements are subject to strict credit control assessments and each customer’s credit worthiness is evaluated on a case-by-case basis. A summary of commitments to extend credit and standby letters of credit written at December 31, 2019 and 2018, are as follows: December 31, 2019 2018 Standby letters of credit $ 46,905 $ 28,964 Available lines of credit 2,818,303 1,514,359 Unfunded loan commitments – fixed 257,277 153,680 Unfunded loan commitments – variable 118,291 65,880 Commitments to make loans are generally made for periods of 30 days or less. At December 31, 2019, the fixed rate loan commitments have interest rates ranging from 2.71% to 10.90% and maturities ranging from 1 year to 20 years. Because many commitments expire without being funded in whole or part, the contract amounts are not estimates of future cash flows. Credit risk represents the accounting loss that would be recognized at the reporting date if counterparties failed completely to perform as contracted. The credit risk amounts are equal to the contractual amounts, assuming that the amounts are fully advanced and that the collateral or other security is of no value. The Company’s policy is to require customers to provide collateral prior to the disbursement of approved loans. The amount of collateral obtained, if it is deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the counterparty. Collateral held varies but may include accounts receivable, inventory, real estate and income providing commercial properties. Standby letters of credit are contractual commitments issued by the Company to guarantee the performance of a customer to a third party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. Outstanding commitments are deemed to approximate fair value due to the variable nature of the interest rates involved and the short-term nature of the commitments.

Concentrations of Credit Risk

Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2019
Risks And Uncertainties [Abstract]
Concentrations of Credit Risk	(2 3 ) Concentrations of Credit Risk Most of the Company’s business activity is with customers located throughout Southeastern United States including Florida, Georgia and Alabama. The majority of commercial and mortgage loans are granted to customers doing business or residing in these areas. Generally, commercial loans are secured by real estate, and mortgage loans are secured by either first or second mortgages on residential or commercial property. As of December 31, 2019, substantially all of the Company’s loan portfolio was secured. Although the Company has a diversified loan portfolio, a substantial portion of its debtors’ ability to honor their contracts is dependent upon the economy of those areas listed above. The Company does not have significant exposure to any individual customer or counterparty.

Basic and Diluted Earnings Per

Basic and Diluted Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Basic and Diluted Earnings Per Share	(2 4 ) Basic and Diluted Earnings Per Share 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 no anti-dilutive stock options for the years ending December 31, 2019, 2018 and 2017. The following table presents the factors used in the earnings per share computations for the periods indicated. 2019 2018 2017 Basic Net income available to common shareholders $ 225,396 $ 156,435 $ 55,795 Less: Earnings allocated to participating securities (88 ) (116 ) (120 ) Net income allocated to common shareholders $ 225,308 $ 156,319 $ 55,675 Weighted average common shares outstanding including participating securities 119,793,869 87,707,196 57,368,322 Less: Participating securities (1) (46,920 ) (65,976 ) (123,624 ) Average shares 119,746,949 87,641,220 57,244,698 Basic earnings per common share $ 1.88 $ 1.78 $ 0.97 Diluted Net income available to common shareholders $ 225,308 $ 156,319 $ 55,675 Weighted average common shares outstanding for basic earnings per common share 119,746,949 87,641,220 57,244,698 Add: Dilutive effects of stock based compensation awards 856,874 1,117,633 1,096,115 Average shares and dilutive potential common shares 120,603,823 88,758,853 58,340,813 Diluted earnings per common share $ 1.87 $ 1.76 $ 0.95 note 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.

Reportable Segments

Reportable Segments	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Reportable Segments	(2 5 ) 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 tables below are reconciliations of the reportable segment revenues, expenses, and profit as viewed by management to the Company’s consolidated total for the year ending December 31, 2019, 2018 and 2017. Year ending December 31, 2019 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 667,428 $ 17,904 $ — $ — $ 685,332 Interest expense (85,225 ) (10,004 ) (4,375 ) — (99,604 ) Net interest income (expense) 582,203 7,900 (4,375 ) — 585,728 Provision for loan losses (10,277 ) (308 ) — — (10,585 ) Non-interest income 101,162 64,898 — — 166,060 Non-interest expense (406,187 ) (35,348 ) (5,372 ) — (446,907 ) Net income (loss) before taxes 266,901 37,142 (9,747 ) — 294,296 Income tax (provision) benefit (61,468 ) (9,265 ) 3,035 — (67,698 ) Noncontrolling interest (1,202 ) — — — (1,202 ) Net income (loss) $ 205,433 $ 27,877 $ (6,712 ) $ — $ 226,598 Total assets $ 16,364,434 $ 777,197 $ 2,981,489 $ (2,981,095 ) $ 17,142,025 Year ending December 31, 2018 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 445,688 $ 14,944 $ — $ — $ 460,632 Interest expense (36,853 ) (7,282 ) (3,415 ) — (47,550 ) Net interest income (expense) 408,835 7,662 (3,415 ) — 413,082 Provision for loan losses (7,914 ) (369 ) — — (8,283 ) Non-interest income 71,731 33,388 8 — 105,127 Non-interest expense (286,191 ) (22,288 ) (3,988 ) — (312,467 ) Net income (loss) before taxes 186,461 18,393 (7,395 ) — 197,459 Income tax (provision) benefit (43,662 ) (4,660 ) 7,298 — (41,024 ) Net income (loss) $ 142,799 $ 13,733 $ (97 ) $ — $ 156,435 Total assets $ 11,769,734 $ 561,885 $ 2,016,908 $ (2,010,939 ) $ 12,337,588 Year ending December 31, 2017 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 240,583 $ 10,743 $ — $ — $ 251,326 Interest expense (11,431 ) (2,989 ) (1,363 ) — (15,783 ) Net interest income 229,152 7,754 (1,363 ) — 235,543 Provision for loan losses (5,037 ) 79 — — (4,958 ) Non-interest income 36,834 28,341 — — 65,175 Non-interest expense (161,946 ) (20,579 ) (3,960 ) — (186,485 ) Net income (loss) before taxes 99,003 15,595 (5,323 ) — 109,275 Income tax (provision) benefit (49,823 ) (6,015 ) 2,358 — (53,480 ) Net income (loss) $ 49,180 $ 9,580 $ (2,965 ) $ — $ 55,795 Total assets $ 6,572,636 $ 506,234 $ 957,253 $ (912,148 ) $ 7,123,975 Commercial and retail banking Correspondent banking and capital markets division Corporate overhead and administration

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Business Combinations	(26) Business C 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. No acquisition costs related to the Sunshine acquisition were incurred during the twelve-month period ending December 31, 2019. During the twelve-month periods ending December 31, 2018 and 2017, the Company incurred approximately $10,474 and $859, respectively, of acquisition costs related to this transaction. These acquisition costs are reported in Merger 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 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 , 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 HCBF Holding Company, Inc. On January 1, 2018, the Company completed its acquisition of HCBF Holding Company, Inc. (“HCBF”) whereby HCBF merged with and into the Company. Pursuant to and simultaneously with the merger of HCBF with and into the Company, HCBF’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. No acquisition costs related to the Sunshine acquisition were incurred during the twelve-month period ending December 31, 2019. During the twelve-month periods ending December 31, 2018 and 2017, the Company incurred approximately $12,302 and $2,060, respectively, of acquisition costs related to this transaction. These acquisition costs are reported in Merger 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 HCBF. The purchase price consisted of both cash and stock. Each share of HCBF 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 HCBF 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 HCBF common stock outstanding at December 31, 2017 22,299,082 Cash consideration each HCBF 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 HCBF common shareholders $ 430,211 Fair value of HCBF stock options converted to CenterState stock options $ 18,025 Total Purchase Price for HCBF $ 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 , 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 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% 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 Servicing asset 1,828 Core deposit intangible 19,795 Goodwill 197,648 Deferred tax asset 3,441 Other assets 17,644 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 , 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 National Commerce Corporation On April 1, 2019, the Company completed its acquisition of NCOM whereby NCOM merged with and into the Company. Pursuant to and simultaneously with the merger of NCOM with and into the Company, NCOM’s wholly owned subsidiary bank, National Bank of Commerce, merged with and into the Company’s subsidiary bank, CenterState Bank, N.A. As a result of that merger, the Bank acquired a controlling 70% interest in CBI, and its factoring subsidiary, Corporate Billing. Subsequently on September 30, 2019, the Company purchased the 30% noncontrolling interest of CBI for $11,400. The undistributed earnings attributable to the noncontrolling interest at period-end September 30, 2019 payable to the noncontrolling interest were distributed in October 2019. The Company’s primary reasons for the transaction were to further 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 36% and 37% as compared with the balances at December 31, 2018 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 twelve-month period ending December 31, 2019, the Company incurred approximately $33,095 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 recognized goodwill on this acquisition of $401,537 which is nondeductible for tax purposes as this acquisition is a nontaxable transaction. The goodwill is calculated based on the fair values of the assets acquired and liabilities assumed as of the acquisition date. The Company acquired 100% of the outstanding common stock of NCOM. The purchase price consisted of stock plus cash in lieu of fractional shares. Each share of NCOM common stock was exchanged for 1.65 shares of the Company’s common stock. Based on the closing price of the Company’s common stock on March 29, 2019, the resulting purchase price was $831,696. The table below summarizes the purchase price calculation. Number of shares of NCOM common stock outstanding at March 29, 2019 21,011,352 Per share exchange ratio 1.650 Number of shares of CenterState common stock less 763 of fractional shares 34,667,968 CenterState common stock price per share on March 29, 2019 $ 23.81 Fair value of CenterState common stock issued $ 825,444 Cash Consideration for 763 of fractional shares $ 20 Total Stock Consideration $ 825,444 Total Cash Consideration 20 Total consideration to be paid to NCOM common shareholders $ 825,464 Fair value of NCOM stock options converted to CenterState stock options 5,848 Fair value of NCOM warrants converted to CenterState warrants 384 Total Purchase Price for NCOM $ 831,696 Th e list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the April 1, 2019 purchase date. April 1, 2019 Assets: Cash and cash equivalents $ 268,524 Loans, held for investment 3,309,234 Purchased credit impaired loans 18,616 Loans held for sale 14,588 Investments 178,488 Accrued interest receivable 11,006 Branch real estate 61,295 Furniture and fixtures 7,204 Bank property held for sale 12,436 FHLB, FRB and other stock 17,076 Bank owned life insurance 55,474 Other real estate owned 875 Servicing asset 1,581 Core deposit intangible 39,900 Goodwill 401,537 Deferred tax asset 16,285 Other assets 23,663 Total assets acquired $ 4,437,782 Liabilities: Deposits $ 3,486,732 Securities sold under agreement to repurchase 18,833 Subordinated debt 38,802 Accrued interest payable 2,095 Other liabilities 47,622 Noncontrolling interest 12,002 Total liabilities assumed and noncontrolling interest $ 3,606,086 In the acquisition, the Company acquired $3,327,850 of loans at fair value, net of $61,384, or 1.8%, estimated discount to the outstanding principal balance, representing 39.9% of the Company’s total loans at December 31, 2018. Of the total loans acquired, management identified $18,616 with credit deficiencies. All loans that were on non-accrual status including accruing loans that are 90 days or more past due that should be recognized as non-accrual, all substandard loans or all loans with impaired collateral value including TDRs and all loans under litigation were considered by management to be credit impaired and are accounted for pursuant to ASC Topic 310-30. No TDRs were acquired from the NCOM transaction. 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, 2019 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 51,527 Non-accretable difference (29,187 ) Cash flows expected to be collected 22,340 Accretable yield (3,724 ) Total purchased credit-impaired loans acquired $ 18,616 The table below presents information with respect to the fair value of acquired loans, as well as their Book Balance at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 615,296 $ 608,705 Commercial real estate 1,762,480 1,736,653 Construction/development/land 363,005 358,643 Commercial loans 539,698 536,262 Consumer and other loans 70,058 68,971 Purchased credit-impaired 38,697 18,616 Total earning assets $ 3,389,234 $ 3,327,850 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 $ 39,900 , 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 . Pro-forma information (supplemental) Pro-forma information for the twelve-month period ending December 31, 2018 assumes the Charter and NCOM acquisitions occurred at the beginning of 2018. Pro-forma data for the twelve-month period ending December 31, 2019 listed in the table below presents pro-forma information as if the NCOM acquisition occurred at the beginning of 2018. Years ended December 31, 2019 2018 Net interest income $ 620,072 $ 623,929 Net income available to common shareholders $ 257,271 $ 240,107 EPS - basic $ 2.01 $ 1.90 EPS - diluted $ 1.99 $ 1.87 The disclosures regarding the results of operations for Charter and NCOM subsequent to their respective acquisition dates are omitted as this information is not practical to obtain. Although the Company did not convert Charter’s core system in the third quarter of 2018 or did not convert NCOM’s core system until the third quarter of 2019, the majority of the fixed costs and purchase accounting entries were booked on the Company’s core system making it impractical to determine Charter or NCOM’s results of operation on a stand-alone basis.

Interest Rate Swap Derivatives

Interest Rate Swap Derivatives	12 Months Ended
	Dec. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Interest Rate Swap Derivatives	(2 7 ) Interest Rate Swap Derivatives Fair Value Hedge The Company enters into interest rate swaps in order to provide commercial loan clients the ability to swap from variable to fixed interest rates. Under these agreements, the Company enters into a variable-rate loan with a client in addition to a swap agreement. This swap agreement effectively converts the client’s variable rate loan into a fixed 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 years ended December 31, 2019 and 2018, the notional amount of such arrangements was $10,596,427 and $5,743,283, respectively. The Company pledged $140,913 and $28,345 of cash as collateral to the third party dealers and clearinghouse exchanges at December 31, 2019 and 2018, respectively. The Company also pledged $361,127 of securities to the third party dealers and clearinghouse exchanges at December 31, 2019. As the interest rate swaps with the clients and third parties are not designated as hedges under ASC 815, changes in market values are reported in earnings. Summary information about the derivative instruments is as follows: 2019 2018 Notional amount $ 10,596,427 $ 5,743,283 Weighted average pay rate on interest-rate swaps 3.20 % 3.64 % Weighted average receive rate on interest rate swaps 3.20 % 3.64 % Weighted average maturity (years) 11 11 Fair value of interest rate swap derivatives (asset) 273,068 92,475 Fair value of interest rate swap derivatives (liability) 274,216 92,892 Cash Flow Hedge The Company is exposed to certain risks relating to its ongoing business operations. The primary risk managed by using derivative instruments is interest rate risk. Interest rate swaps are utilized to manage interest rate risk associated with the Company's variable rate borrowings entered during the second quarter of 2019. The Company recognizes interest rate swaps as either assets or liabilities at fair value in the Consolidated Balance Sheets. The interest rate swap contract entered during the second quarter of 2019 on a variable rate borrowing was designated as a cash flow hedge and was negotiated over the counter. The contract was entered into by the Company with a counterparty and the specific agreement of terms were negotiated, including the amount, interest rate and maturity. The following table reflects the cash flow hedge included in the Condensed Consolidated Balance Sheets as of December 31, 2019: December 31, 2019 Notional amount $ 150,000 Fair value of interest rate swap derivatives (asset) — Fair value of interest rate swap derivatives (liability) 817 The following table presents the net unrealized holding losses recorded in Accumulated Other Comprehensive Income on the Company’s Condensed Consolidated Balance Sheet and Condensed Consolidated Statements of Income and Comprehensive Income relating to the cash flow derivative instrument for the nine-month period ended December 31, 2019: December 31, 2019 Amount of Amount of gain / (loss) Location of gain / (loss) loss reclassified from OCI reclassified from AOCI recognized in OCI to interest income to income Interest rate contracts - pay fixed, receive floating $ (613 ) $ — Interest expense: Federal funds purchased and other borrowings During the year ended December 31, 2019, the derivative position designed as a cash flow hedge was not discontinued and none of the losses reported in Accumulated Other Comprehensive Income were reclassified into earnings as a result of the discontinuance of a cash flow hedge or because of the early extinguishment of the borrowing.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	12 Months Ended
	Dec. 31, 2019
Revenue From Contract With Customer [Abstract]
Revenue from Contracts with Customers	(2 8 ) 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 Correspondent Banking Capital Markets Revenue - 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. Other Correspondent Banking Related Revenue 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. 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. Wealth Management Related Revenue - 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 Related Revenue - 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. Wealth Management Related Revenue - 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. Debit, Prepaid, ATM and Merchant Card Related Fees - 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. Debit, Prepaid, ATM and Merchant Card Related Fees - 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, Prepaid, ATM and Merchant Card Related Fees - 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 Repossessed Real Estate (“OREO”) The Company records a gain or loss from 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 repossessed OREO properties as of December 31, 2019. 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.

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	(29 ) Leases In February 2016, the FASB established Topic 842, Leases, by issuing Accounting Standards Update (ASU) No. 2016-02, which requires lessees to recognize leases on-balance sheet and disclose key information about leasing arrangements. Subsequently, amendments ASU No. 2018-01, Land Easement Practical Expedient for Transition to Topic 842; ASU No. 2018- 10, Codification Improvements to Topic 842, Leases; and ASU No. 2018-11, Targeted Improvements were issued. ASC 842 establishes a right-of-use (“ROU”) model that requires a lessee to recognize a ROU asset and lease liability on the balance sheet for all leases with a term longer than 12 months. Leases are classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the income statement. The Company leases certain properties and equipment under operating leases that resulted in the recognition of ROU Lease Assets of $20,311 and Lease Liabilities of $22,795 on the Company’s Condensed Consolidated Balance Sheets. ASC 842 was effective on January 1, 2019. A modified retrospective transition approach is required, applying the new standard to all leases existing at the date of initial application. The Company chose to use the effective date approach. As such, all periods presented after January 1, 2019 are under ASC 842 whereas periods presented prior to January 1, 2019 are in accordance with prior lease accounting of ASC 840. Financial information was not updated and the disclosures required under ASC 842 was not provided for dates and periods before January 1, 2019. ASC 842 provides a number of optional practical expedients in transition. The Company has elected the ‘package of practical expedients,’ which permits the Company not to reassess under the new standard the prior conclusions about lease identification, lease classification and initial direct costs. The Company also elected the use of the hindsight, a practical expedient which permits the use of information available after lease inception to determine the lease term via the knowledge of renewal options exercised not available as of the leases inception. The practical expedient pertaining to land easements is not applicable to the Company. ASC 842 also requires certain accounting elections for ongoing application of ASC 842. The Company elected the short-term lease recognition exemption for all leases that qualify, meaning those with terms under twelve months. ROU assets or lease liabilities are not to be recognized for short-term leases. However, since all real estate and equipment leases have terms greater than 12 months, no leases currently meet this exemption. The Company also elected the practical expedient to not separate lease and non-lease components for all leases, the majority of which consist of real estate common area maintenance expenses. However, since these non-lease items are subject to change, they are treated and disclosed as variable payments in the quantitative disclosures below. Consequently, ASC 842’s changed guidance on contract components will not significantly affect our financial reporting. Similarly, ASC 842’s narrowed definition of initial direct costs will not significantly affect financial reporting. Lessee Leases The majority of the Company’s lessee leases are operating leases, and consist of leased real estate for branches and operations centers. Options to extend and renew leases are generally exercised under normal circumstances. Advance notification is required prior to termination, and any noticing period is often limited to the months prior to renewal. Variable payments generally consist of common area maintenance and taxes. Rent escalations are generally specified by a payment schedule, or are subject to a defined formula. The Company also elected the practical expedient to not separate lease and non-lease components for all leases, the majority of which consist of real estate common area maintenance expenses. Generally, leases do not include guaranteed residual values, but instead typically specify that the leased premises are to be returned in satisfactory condition with the Company liable for damages. The Company also has other operating leases for various equipment, including copiers, printers, and other small equipment. Equipment lease terms and conditions generally specify a fixed amount and term with options to renew. The Company’s equipment leases are typically not renewed, and existing leases are typically assumed from prior bank acquisitions. For operating leases, the lease liability and ROU asset (before adjustments) are recorded at the present value of future lease payments. ASC 842 requires the use of the lease interest rate; however, this rate is typically not known. As an alternative, ASC 842 permits the use of an entity’s fully secured incremental borrowing rate. The Company is electing to utilize the FHLB Atlanta Fixed Rate Advance index, as it is the most actively used institution-specific collateralized borrowing source available to the Company. The Company also holds a small number of finance leases assumed in connection to prior acquisitions. These leases are all real estate leases. Terms and conditions are similar to those real estate operating leases described above, but the lease terms are generally longer. Lease classifications from the acquired institution were retained, and were again retained as a result of the election of the package of practical expedients described above. December 31, 2019 Amortization of ROU Assets - Finance Leases $ 196 Interest on Lease Liabilities - Finance Leases 215 Operating Lease Cost (Cost resulting from lease payments) 7,453 Variable Lease Cost (Cost excluded from lease payments) 1,211 Total Lease Cost $ 9,075 Finance Lease - Operating Cash Flows 294 Finance Lease - Financing Cash Flows 294 Operating Lease - Operating Cash Flows (Fixed Payments) 7,585 Operating Lease - Operating Cash Flows (Liability Reduction) 7,131 New ROU Assets - Operating Leases 39,205 Weighted Average Lease Term (Years) - Finance Leases 10.93 Weighted Average Lease Term (Years) - Operating Leases 7.13 Weighted Average Discount Rate - Finance Leases 5.83 % Weighted Average Discount Rate - Operating Leases 3.33 % A maturity analysis of operating lease liabilities and reconciliation of the undiscounted cash flows to the total operating lease liabilities as of December 31, 2019 is as follows: December 31, 2019 Operating lease payments due: Within one year $ 7,577 After one but within two years 6,693 After two but within three years 5,358 After three but within four years 4,419 After four years but within five years 3,723 After five years 11,410 Total undiscounted cash flows 39,180 Discount on cash flows (4,695 ) Total operating lease liabilities $ 34,485 The following is a schedule of future minimum annual rentals under operating leases as of December 31, 2018: Year ending December 31, 2019 $6,524 2020 5,096 2021 4,411 2022 3,633 2023 2,558 Thereafter 11,088 $33,310 Lessor Leases ASC 842 also impacted lessor accounting. ASC 842 changed the criteria in which a lessor lease is classified. A lease is a sales-type lease if any one of five criteria are met, each of which indicate that the lease, in effect, transfers control of the underlying asset to the lessee. If none of those five criteria are met, but two additional criteria are both met, indicating that the lessor has transferred substantially all the risks and benefits of the underlying asset to the lessee and a third party, the lease is a direct financing lease. All leases that are not sales-type or direct financing leases are operating leases. Similar to the above lessee leases, the Company has elected the ‘package of practical expedients,’ which allows the Company not to reassess the Company’s prior conclusions under ASC 842 about lease identification, lease classification and initial direct costs. The Company also elected the use of the hindsight, a practical expedient which permits the use of information available after lease inception to determine the lease term via the knowledge of renewal options exercised not available as of the leases inception. Lastly, the practical expedient pertaining to land easements is not applicable to the Company. While ASC 842 identifies common area building maintenance as a non-lease component of our real estate lease contracts, the Company elected to account for the Company’s real estate leases and associated common area maintenance service components as a single, combined operating lease component. Consequently, ASC 842’s changed guidance on contract components will not significantly affect financial reporting. Substantially, all of the Company’s lessor leases are related to unused real estate office space owned by the Company. Most have defined terms, though some leases have gone month-to-month once the initial term has passed. The impact of subleases is not material. Income from operating leases are reported within Occupancy Expense as an offset to Non-interest Expense in the Company’s Condensed Consolidated Statements of Income and Comprehensive Income. The Company is also the lessor on a few equipment direct finance leases (formerly known as capital leases) with three municipal entities. Interest income from these leases are tax exempt, and is reported within loan interest income. The lessee retains the title to all equipment in each of these finance leases. Each of these leases originated in 2018, and therefore the prior ASC 840 classification was not reassessed due to the election of the package of practical expedients. December 31, 2019 Operating Lease Income from Lease Payments $ 1,793 Direct Financing Lease Income 513 Total Lease Income $ 2,306 Net Investment in Direct Financing Leases $ 1,391 Unguaranteed Residual Assets — Deferred Selling Profit on Direct Financing Leases — Maturity Analysis of Operating Lease Receivables 0 - 12 Months $ 1,978 13 - 24 Months 1,599 25 - 36 Months 897 37 - 48 Months 188 48 - 60 Months — Over 60 Months — Maturity Analysis of Finance Lease Receivables 0 - 12 Months $ 916 13 - 24 Months 475 25 - 36 Months — 37 - 48 Months — 48 - 60 Months — Over 60 Months —

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	(30) Announcement of Merger of Equals between CenterState and South State Corporation On January 27, 2020, the Company and South State Corporation (“South State”) announced the execution of an Agreement and Plan of Merger, dated as of January 25, 2020 (the “Merger Agreement”), providing for the merger of the Company and South State, subject to the terms and conditions set forth therein. Under the terms of the Merger Agreement, which was unanimously approved by the Boards of Directors of both companies, the Company’s shareholders will receive 0.3001 shares of South State common stock for each share of CenterState common stock they own. The transaction is expected to close in the third quarter of 2020 subject to customary closing conditions, including receipt of all applicable regulatory approvals and shareholder approval of each company. The Company’s primary reason for the transaction is to create a leading Southeastern-based regional bank, which diversifies each company’s geographies into a contiguous six-state footprint, spanning from Florida to Virginia. The transaction will also expand both companies’ customer base which will enhance deposit fee income and leverage operating cost through economies of scale. The combined company will operate under the South State Bank name and will trade under the South State ticker symbol SSB on the Nasdaq stock market. The company will be headquartered in Winter Haven, Florida and will maintain a significant presence in Columbia and Charleston, South Carolina; Charlotte, North Carolina; and Atlanta, Georgia. South State is a bank holding company headquartered in Columbia, South Carolina. South State’s bank subsidiary South State Bank operates 157 banking locations. South State reported total assets of $15,921,092, total loans of $11,370,040 and total deposits of $12,177,096 as of December 31, 2019. Stock Repurchase Plan On January 16, 2020, the Company announced that it had approved a new share repurchase program. Under this repurchase program, the maximum number of shares subject to its share repurchase program is 6,500,000 shares of the Company’s outstanding common stock, subject to market conditions. The total shares subject to the Company’s repurchase plan represent approximately 5% of the Company’s outstanding shares as of December 31, 2019. The repurchases will be made from time to time by the Company in the open market as conditions allow throughout the plan period from January 16, 2020 to January 16, 2022, unless shortened or extended by the Company’s Board of Directors. The stock repurchase program does not obligate the Company to repurchase any specified number of shares of its common stock. The shares may be purchased in open market or negotiated transactions. Open market purchases will be conducted in accordance with the limitations set forth in Rule 10b-18 of the Securities and Exchange and Commission and other applicable legal requirements. The number, price and timing of the repurchases, if any, will be at the Company’s sole discretion and will depend on a number of factors, including market and economic conditions, liquidity needs and other factors and there is no assurance that the Company will purchase any shares under the program. This stock repurchase program replaces the stock repurchase plan authorized on April 25, 2019 . As of February 26, 2020, subsequent to the fourth quarter of 2019, the Company repurchased an additional 1,102,934 common shares pursuant to an ongoing 10b-5 repurchase plan disclosed above at a volume-weighted average price of $23.46. Approximately 5.4 million shares remain under the Company’s existing repurchase authorization.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Nature of Operations and Principles of Consolidation	(a) Nature of operations and principles of consolidation The Consolidated Financial Statements of CenterState Bank Corporation (the “Company”) include the accounts of the Company, and its wholly owned subsidiaries CenterState Bank, N.A., R4ALL, Inc. and CSFL Insurance Corp. All significant intercompany accounts and transactions have been eliminated in consolidation. At December 31, 2019, the Company, through its subsidiary bank, operated as a community bank headquartered in the state of Florida, providing traditional retail, commercial, mortgage, wealth management and SBA services throughout its Florida, Georgia and Alabama branch network and customer relationships in neighboring states. The Company’s primary deposit products are checking, savings and term certificate accounts, and its primary lending products include commercial real estate loans, residential real estate loans, commercial loans and consumer loans. Substantially all loans are secured by commercial real estate, residential real estate, business assets or consumer assets. There are no significant concentrations of loans to any one industry or customer. However, the customers’ ability to repay their loans is dependent on the real estate and general economic conditions in the area. The Company also provides correspondent banking and capital markets services to over 650 community banks nationwide. The Bank also owns CBI, which in turn owns Corporate Billing, a transaction-based finance company headquartered in Decatur, Alabama that provides factoring, invoicing, collection and accounts receivable management services to transportation companies and automotive parts and services providers throughout the United States and Canada. R4ALL, Inc. is a non-bank subsidiary incorporated during the third quarter of 2009. The primary purpose of this subsidiary is to purchase, hold, and dispose of troubled assets acquired from the Company’s subsidiary bank. CSFL Insurance Corp. is a non-bank subsidiary incorporated during the fourth quarter of 2015. The primary purpose of this subsidiary is to function as a captive insurance subsidiary pursuant to Section 831(b) of the U.S. Tax Code. National Commerce Risk Management, Inc., which was a captive insurance subsidiary pursuant to Section 831(b) of the U.S. Tax Code acquired from the NCOM transaction, was dissolved in December 2019. The following is a description of the basis of presentation and the significant accounting and reporting policies, which the Company follows in preparing and presenting its Consolidated Financial Statements.
Use of Estimates	(b) Use of estimates To prepare financial statements in conformity with U.S. generally accepted accounting principles, management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided. Significant items subject to estimates and assumptions include allowance for loan losses, fair values of financial instruments, useful life of intangibles and valuation of goodwill, fair value estimates of stock-based compensation, fair value estimates of OREO, and deferred tax assets. Actual results could differ from these estimates.
Cash Flow Reporting	(c) Cash flow reporting For purposes of the statement of cash flows, the Company considers cash and due from banks, federal funds sold, money market and non-interest bearing deposits in other banks with a purchased maturity of three months or less to be cash equivalents. Net cash flows are reported for customer loan and deposit transactions, interest bearing deposits in other financial institutions, federal funds purchased, repurchase agreements, proceeds from capital offering and other borrowed funds.
Interest Bearing Deposits in Other Financial Institutions	(d) Interest bearing deposits in other financial institutions Interest bearing deposits in other financial institutions mature within one year and are carried at cost and are included in Cash and Due From Banks in the Consolidated Balance Sheets.
Trading Securities	(e) The Company engages in trading activities for its own account. Securities that are held principally for resale in the near term are recorded at fair value with changes in fair value included in earnings. Interest is included in net interest income.
Investment Debt Securities	(f) Investment Debt Securities Debt securities are classified as held to maturity and carried at amortized cost when management has the positive intent and ability to hold them to maturity. Debt securities not classified as held to maturity or trading are classified as available for sale. Debt securities available for sale are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of tax. Interest income includes amortization of purchase premium or discount. Premiums on securities are amortized to the earliest call date. Discounts on securities are amortized on the level-yield method without anticipating prepayments, except for mortgage backed securities where prepayments are anticipated. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. Securities are evaluated for other-than-temporary impairment (“OTTI”) on at least an annual basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement; and 2) other-than-temporary impairment related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis.
Bond Commissions Revenue Recognition	(g) Bond commissions revenue recognition Bond sales transactions and related revenue and expenses are recorded on a settlement date basis. The effect on the financial statements of using the settlement date basis rather than the trade date basis is not material.
Loans Held for Sale	(h) Loans held for sale Mortgage loans originated and intended for sale in the secondary market are carried at fair value with changes in fair value recognized in current period earning. Net unrealized losses, if any, are recorded as a valuation allowance and charged to earnings. Mortgage loans held for sale are generally sold with servicing rights released. Gains and losses on sales of mortgage loans are based on the difference between the selling price and the carrying value of the related loan sold.
Loans	(i) Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at their outstanding unpaid principal balance net of purchase premiums and discounts, deferred loan fees and costs, and an allowance for loan losses. Interest income is accrued on the unpaid principal balance. The recorded investment in a loan excludes accrued interest receivable, deferred fees, and deferred costs because they are not considered material. A loan is considered a troubled debt restructured loan based on individual facts and circumstances. A modification may include either an increase or reduction in interest rate or deferral of principal payments or both. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings. The Company classifies troubled debt restructured loans as impaired and evaluates the need for an allowance for loan losses on a loan-by-loan basis. An allowance for loan losses is based on either the present value of estimated future cash flows or the estimated fair value of the underlying collateral. Loans retain their accruing or non-accruing status at the time of modification. Loan origination fees and the incremental direct cost of loan origination, are deferred and recognized in interest income without anticipating prepayments over the contractual life of the loans. If the loan is prepaid, the remaining unamortized fees and costs are charged or credited to interest income. Amortization ceases for non-accrual loans. A loan is moved to non-accrual status in accordance with the Company’s policy typically after 90 days of non-payment, or less than 90 days of non-payment if management determines that the full timely collection of principal and interest becomes doubtful , excluding factored receivables. For CBI’s factored receivables, which are commercial trade credits rather than promissory notes, the Company’s practice, in most cases, is to charge-off unpaid recourse receivables when they become 90 days past due from the invoice due date and the non-recourse receivables when they become 120 days past due from the statement billing date . Past due status is based on the contractual terms of the loan. In all cases, loans are placed on non - accrual or charged-off at an earlier date if collection of principal or interest is considered doubtful. Non - accrual loans and loans past due 90 days still on accrual include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans. Single family home loans, consumer loans and smaller commercial, land, development and construction loans (less than $ 500 ) are monitored by payment history, and as such, past due payments is generally the triggering mechanism to determine non - accrual status. Larger (greater than $ 500 ) commercial, land, development and construction loans are monitored on a loan level basis, and therefore in these cases it is more likely that a loan may be placed on non - accrual status before it becomes 90 days past due. All interest accrued but not received for loans placed on non-accrual is reversed against interest income. Interest received on such loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Non real estate consumer loans are typically charged off no later than 120 days past due. The Company, considering current information and events regarding the borrower’s ability to repay their obligations, considers a loan to be impaired when it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is considered to be impaired, the amount of the impairment is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the secondary market value of the loan, or the fair value of the collateral for collateral dependent loans. Interest income on impaired loans is recognized in accordance with the Company’s non-accrual policy. Impaired loans are written down to the extent that principal is judged to be uncollectible and, in the case of impaired collateral dependent loans where repayment is expected to be provided solely by the underlying collateral and there is no other available and reliable sources of repayment, are written down to the lower of cost or collateral value less estimated selling costs. Impairment losses are included in the allowance for loan losses. Large groups of smaller balance homogeneous loans, such as consumer and residential real estate loans, are collectively evaluated for impairment, and accordingly, they are not separately identified for impairment disclosures.
Purchased Credit-Impaired Loans	(j) Purchased credit-impaired loans As a part of business acquisitions, the Company acquires loans, some of which have shown evidence of credit deterioration since origination. These purchased credit-impaired (“PCI”) loans were determined to be credit impaired based on specific risk characteristics of the loan, including, but not limited to loans on non-accrual status, loans with insufficient cash flow, past due loans, high loan-to-value ratios, loans in process of foreclosure, or any TDR with loss potential. The Company, as a purchaser, is permitted to aggregate credit impaired loans acquired in the same fiscal quarter into one or more pools, provided that the loans have common risk characteristics. A pool is then accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. For the loan portfolios acquired, the Company aggregated the commercial, consumer, and residential loans into pools of loans with common risk characteristics for each institution acquired. These acquired loans were recorded at the acquisition date fair value, and after acquisition, losses are recognized through the allowance for loan losses. The Company estimates the amount and timing of expected cash flows for each acquired loan pool and the expected cash flows in excess of the amount paid is recorded as interest income over the remaining life of the loan pools. As frequently as quarterly or as long as annually, the Company updates the amount of loan principal and interest cash flows expected to be collected, incorporating assumptions regarding default rates, loss severities, the amounts and timing of prepayments and other factors that are reflective of current market conditions. Probable decreases in expected loan principal cash flows trigger the recognition of impairment, which is measured as the present value of the expected principal loss plus any related foregone interest cash flows discounted at the pool’s effective interest rate. Impairments that occur after the acquisition date are recognized through provision for loan losses. Probable and significant increases in expected principal cash flows would first reverse any previously recorded allowance for loan losses; any remaining increases are recognized prospectively as interest income over the life of the pool. The impacts of (i) prepayments, (ii) changes in variable interest rates, and (iii) any other changes in the timing of expected cash flows are recognized prospectively as adjustments to interest income over the life of the pool. Disposals of loans, which may include sales of loans, receipt of payments in full by the borrower, or foreclosure, result in removal of the loan from the purchased credit impaired portfolio.
Concentration of Credit Risk	(k) Concentration of credit risk Most of the Company’s business activity is with customers located within Southeastern United States largely in Florida, Alabama and Georgia. Therefore, the Company’s exposure to credit risk is significantly affected by changes in the economy and the real estate market within Southeast.
Allowance for Loan Losses	(l) Allowance for loan losses The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. Management estimates the allowance balance required using past loan loss experience, the nature and volume of the portfolio, information about specific borrower situations and estimated collateral values, economic conditions, and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged-off. The allowance consists of specific and general components. The specific component relates to loans that are individually classified as impaired. The general component covers loans that are not individually classified as impaired and is based on historical loss experience adjusted for current factors. A loan is impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Loans, for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings and classified as impaired. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported, net, at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Commercial, commercial real estate, land, acquisition and development, and construction loans over $500 are individually evaluated for impairment. Large groups of smaller balance homogeneous loans, such as consumer and residential real estate loans, are collectively evaluated for impairment, and accordingly, they are not separately identified for impairment disclosures. Troubled debt restructurings are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate. If a troubled debt restructuring is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. For troubled debt restructurings that subsequently default, the Company determines the amount of reserve in accordance with the accounting policy for the allowance for loan losses. The general component covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the most recent two years. The portfolio segments identified by the Company are residential loans, commercial real estate loans, construction and land development loans, commercial and industrial and consumer and other. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment. These economic factors include consideration of the following: levels of and trends in delinquencies and impaired loans; volume and severity of adversely classified or graded loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations. The Company segregates and evaluates its loan portfolio through the five portfolio segments: residential real estate, commercial real estate, land/ land development/construction, commercial and consumer/other. Residential real estate loans are a mixture of fixed rate and adjustable rate residential mortgage loans, including first mortgages, second mortgages or home equity lines of credit. As a policy, the Company holds adjustable rate loans and sells a portion of its fixed rate loan originations into the secondary market. Changes in interest rates or market conditions may impact a borrower’s ability to meet contractual principal and interest payments. Residential real estate loans are secured by real property. Commercial real estate loans include loans secured by office buildings, warehouses, retail stores and other property located in or near our markets. These loans are originated based on the borrower’s ability to service the debt and secondarily based on the fair value of the underlying collateral. Land/land development/construction loans include residential and commercial real estate loans and include a mixture of owner occupied and non-owner occupied. The majority of the loans in this category are land related, either undeveloped land, land held for development, residential building lots and commercial building lots. Generally the terms are three to five years, with a potential for renewal at maturity. Commercial loans consist of small-to medium-sized businesses including professional associations, medical services, retail trade, transportation, wholesale trade, manufacturing and tourism. Commercial loans are derived from our market areas and underwritten based on the borrower’s ability to service debt from the business’s underlying cash flows. As a general practice, we obtain collateral such as inventory, accounts receivable, equipment or other assets although such loans may be uncollateralized but guaranteed. Consumer and other loans include automobiles, boats, mobile homes without land, or uncollateralized but personally guaranteed loans. These loans are originated based primarily on credit scores, debt-to-income ratios and loan-to-value ratios. The Company evaluates the loans acquired from the Gulfstream, First Southern, Community Bank, First National, Platinum, Gateway, HCBF, Sunshine and NCOM acquisitions that were not PCI loans as individual loan portfolio segments. The Company considered the levels of and trends in non-performing loans, past-due loans, adverse loan grade classification changes, historical loss rates, environmental factors and impaired loans in arriving at its estimate. The general loan loss allowance recorded for these performing loans acquired from Gulfstream is allocated between the five portfolio segments described above in Note 5.
Transfer of Financial Assets	(m) Transfer of financial assets Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Other Repossessed Real Estate Owned	(n) Other repossessed real estate owned Assets acquired through or instead of loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed. Repossessed real estate is included in other repossessed real estate owned and other repossessed assets other than real estate is included in Prepaid Expenses and Other Assets in the Consolidated Balance Sheets.
Premises and Equipment	(o) Premises and equipment Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Depreciation is provided on a straight-line basis over the estimated useful lives of the related assets. Buildings are depreciated over a 39 year period, and furniture, fixtures and equipment are depreciated over their related useful life (3 to 15 years). Leasehold improvements are depreciated over the shorter of their useful lives or the term of the lease. Major renewals and betterments of property are capitalized; maintenance, repairs, and minor renewals and betterments are expensed in the period incurred. Upon retirement or other disposition of the asset, the asset cost and related accumulated depreciation are removed from the accounts, and gains or losses are included in income.
Software Costs	(p) Software costs Costs of software developed for internal use, such as those related to software licenses, programming, testing, configuration, direct materials and integration, are capitalized and included in premises and equipment. Included in the capitalized costs are those costs related to both our personnel and third party consultants involved in the software development and installation. Once placed in service, the capitalized asset is amortized on a straight-line basis over its estimated useful life, generally three to five years. Capitalized costs of software developed for internal use are reviewed periodically for impairment.
Federal Home Loan Bank (FHLB), Federal Reserve Bank (FRB) and Other Stock	(q) Federal Home Loan Bank (FHLB), Federal Reserve Bank (FRB) and other stock The Company’s subsidiary bank is a member of the FHLB and FRB system. Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB, FRB and other stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income.
Bank Owned Life Insurance (BOLI)	(r) Bank owned life insurance (BOLI) The Company, through its subsidiary bank, has purchased life insurance policies on certain key executives or acquired through various bank acquisitions. Bank owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement.
Goodwill and Other Intangible Assets	(s) Goodwill and other intangible assets Goodwill resulting from business combinations prior to January 1, 2009 represents the excess of the purchase price over the fair value of the net assets of businesses acquired. Goodwill resulting from business combinations after January 1, 2009, is generally determined as the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill and intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but tested for impairment at least annually. The Company has selected November 30 as the date to perform the annual impairment test. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Goodwill is the only intangible asset with an indefinite life on the Company’s balance sheet. The core deposit intangibles are intangible assets arising from either whole bank acquisitions or branch acquisitions. They are initially measured at fair value and then amortized over a ten-year As a part of normal business operations, the Company originates residential mortgage loans that have been pre-approved by secondary investors. The terms of the loans are set by the secondary investors, and the purchase price that the investor will pay for the loan is agreed to prior to the commitment of the loan by the Company. Generally within three weeks after funding, the loans are transferred to the investor in accordance with the agreed-upon terms. The Company records gains from the sale of these loans on the settlement date of the sale equal to the difference between the proceeds received and the carrying amount of the loan. The gain generally represents the portion of the proceeds attributed to servicing release premiums received from the investors and the realization of origination fees received from borrowers which were deferred as part of the carrying amount of the loan. Between the initial funding of the loans by the Company and the subsequent reimbursement by the investors, the Company carries the loans on its balance sheet at the lower of cost or market. The fair value of the underlying commitment is not material to the Consolidated Financial Statements. The standard structure of mortgage loan sales provides for the Company to retain a portion of the cash flow from the interest payments received on the loan. Fees for servicing loans for investors are based on the outstanding principal balance of the loans serviced and are recognized as income when earned. This cash flow is commonly known as a servicing spread. The servicing spread is recognized as a servicing asset to the extent the spread exceeds adequate compensation for the servicing function and recorded as a component of Other Intangible Assets in the Consolidated Balance Sheets. The fair value of the servicing asset is measured on a recurring basis at the present value of future cash flows using market-based discount assumptions. The future cash flows for each asset are based on their unique characteristics and market-based assumptions for prepayment speeds, default and voluntary prepayments. Adjustments to fair value are recorded as a component of Mortgage Banking Revenue. The value of our servicing portfolio is periodically independently evaluated.
Loan Commitments and Related Financial Instruments	( t ) Loan commitments and related financial instruments Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded.
Stock-Based Compensation	( u ) Stock-based compensation Compensation cost is recognized for stock options and restricted stock awards issued to employees, based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of the Company’s common stock at the date of grant is used for restricted stock awards. During 2014 the Company initiated a Long-Term Incentive Plan which included Performance Share Units (“PSUs”). The Monte-Carlo Simulation model was used to estimate fair value of the PSUs at the grant date. Compensation cost is recognized over the required service period, generally defined as the vesting period.
Income Taxes	( v ) Income taxes Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. The Company recognizes interest and/or penalties related to income tax matters in other expenses. On December 22, 2017, the U.S. federal government enacted a tax bill, H.R1 (“Tax Act”) which reduced the federal corporate tax rates effective January 1, 2018. As a result of this new tax bill, the Company evaluated its deferred tax assets and deferred tax liabilities to account for the future impact of lower corporate tax rates on its deferred tax assets. The reduction in the federal corporate tax rate resulted in a one-time charge to the Company’s 2017 earnings and reduction to its net deferred tax assets. See Note 15 for more details regarding Income Taxes.
Retirement Plans	( w ) Retirement plans Employee 401(k) plan expense is the amount of matching contributions. Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service.
Marketing and Advertising Costs	( x ) Marketing and advertising costs Marketing and advertising costs are expensed as incurred.
Earnings Per Common Share	( y ) Basic earnings per common share is net income divided by the weighted average number of common shares outstanding during the period. All outstanding unvested share-based payment awards that contain rights to nonforfeitable dividends are considered participating securities for this calculation. Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable under stock options, stock warrants and unvested restricted stock awards where shares are not issued until vested. Earnings and dividends per share are restated for all stock splits and stock dividends through the date of issuance of the financial statements.
Comprehensive Income	( z ) Comprehensive income Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on securities available for sale and unrealized holding gains and losses on interest rate swaps, which are also recognized as separate components of shareholders’ equity.
Loss Contingencies	(a a ) Loss contingencies Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there now are such matters that will have a material effect on the financial statements.
Restrictions on Cash	(a b ) Restrictions on cash Cash on hand or on deposit with the Federal Reserve Bank is generally required to meet regulatory reserve and clearing requirements. Cash is required to be pledged as collateral to the third party dealers for the interest rate swap derivatives.
Dividend Restriction	(a c ) Dividend restriction Banking regulations require maintaining certain capital levels and may limit the dividends paid by the bank to the holding company or by the holding company to shareholders.
Fair Value of Financial Instruments	(a d ) Fair value of financial instruments Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in a separate note. Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect the estimates.
Segment Reporting	(a e ) Segment reporting The Company’s correspondent banking and capital markets division represents a distinct reportable segment which differs from the Company’s primary business of commercial and retail banking in Florida, Georgia and Alabama. Accordingly, a reconciliation of reportable segment revenues, expenses and profit to the Company’s consolidated total has been presented in Note 25.
Derivatives	(a f ) 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. The Company does not use derivatives for trading purposes. The derivative transactions are considered instruments with no hedging designation, otherwise known as stand-alone derivatives. Changes in the fair value of the derivatives are reported currently in earnings.
Reclassifications	(a g ) Reclassifications Some items in the prior year financial statements were reclassified to conform to the current presentation. Reclassifications had no effect on prior years’ net income or shareholders’ equity.
Effect of New Pronouncements	(a h ) Effect of new pronouncements 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. Management is electing the effective date method of the modified retrospective transition approach. Under the effective date method, all lease accounting transitions to ASC 842 as of January 1, 2019 through a one-time recognition of previously off-balance sheet leases as well as a one-time offset to retained earnings for measurement differences. Under the effective date transition approach, all comparative periods presented prior to January 1, 2019 will remain in accordance with legacy lease accounting of ASC 840. The adoption of this standard on January 1, 2019 resulted in the recognition of right-of-use lease assets of $20,311 and lease liabilities of $22,795 on the Company’s Consolidated Balance Sheets. The one-time transition reduced retained earnings by $1,093. 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. It selected a third-party vendor to assist with the allowance for credit loss methodology as well as advisory services related to the implementation of the amendments of ASU 2016-13. Management decided on a discounted cash flow model , worked on internal controls and buil t a qualitative framework . Effective January 1, 2020, the Company adopted ASU Topic 326. Based on the most recent analysis, we expect the allowance to loans ratio to increase by approximately 55 bps to 70 bps , which equates to a $ 65 to $ 84 million increase to the allowance, as a result of the adoption of CECL. This increase includes the reclassification of the credit mark on PCD loans from loan discount to ACL. Excluding the reclassification of the credit mark on PCD loans, the increase to the allowance is estimated to be $ 48 to $ 67 million. In addition, the Company estimates a reserve for potential losses on unfunded commitments to be in the range of $ 5 to $ 10 million, which will be recorded as a liability. Based on these ranges, the impact to retained earnings, net of deferred taxes, for the increase in ACL, reserve for the unfunded commitments and expected credit losses on debt securities is estimated to be in the range of $ to $ m illion . The estimates on the potential impact of the adoption of CECL on the Company’s financial statements are based on ongoing analyses, current expectations and forecasted economic conditions. These estimates are contingent upon continued refinement of assumptions, methodologies and judgments, which the Company will finalize in the first quarter 2020. The standard will add new disclosures starting with the March 31, 2020 10Q 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. 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 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 evaluated the impact of adopting the new guidance on the Consolidated Financial Statements, but it does not 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. The following disclosure requirements were added to Topic 820: (1) the 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) the 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, 2019. 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.

Trading Securities (Tables)

Trading Securities (Tables)	12 Months Ended
	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Trading Securities Portfolio Realized and Unrealized Gains and Losses	A list of the activity in this portfolio for 2019 and 2018 is summarized below. 2019 2018 Beginning balance $ 1,737 $ 6,777 Purchases 194,799 254,555 Proceeds from sales (191,648 ) (259,652 ) Net realized gain on sales 96 20 Net unrealized gains 3 37 Ending balance $ 4,987 $ 1,737

Investment Debt Securities (Tab

Investment Debt Securities (Tables)	12 Months Ended
	Dec. 31, 2019
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: December 31, 2019 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value Corporate debt securities $ 5,504 $ 153 $ — $ 5,657 Obligations of U.S. government sponsored entities and agencies 20,000 — 70 19,930 Mortgage-backed securities 1,742,221 26,403 1,382 1,767,242 Municipal securities 88,301 5,594 — 93,895 Total available for sale debt securities $ 1,856,026 $ 32,150 $ 1,452 $ 1,886,724 December 31, 2018 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value Corporate debt securities $ 6,265 $ 162 $ — $ 6,427 Obligations of U.S. government sponsored entities and agencies 38,794 7 933 37,868 Mortgage-backed securities 1,623,906 3,792 33,423 1,594,275 Municipal securities 88,415 698 335 88,778 Total available for sale debt securities $ 1,757,380 $ 4,659 $ 34,691 $ 1,727,348
Schedule of Sales of Available for Sale Securities	Total sales of available for sale securities were as follows: 2019 2018 2017 Proceeds $ 227,152 $ 355,652 $ 312,692 Gross gains 1,132 68 740 Gross losses 1,107 90 747
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 December 31, 2019 and 2018. December 31, 2019 Gross Gross Amortized Unrecognized Unrecognized Fair Cost Gains Losses Value Mortgage-backed securities $ 71,560 $ 456 $ 29 $ 71,987 Municipal securities 131,343 5,522 — 136,865 Total held to maturity debt securities $ 202,903 $ 5,978 $ 29 $ 208,852 December 31, 2018 Gross Gross Amortized Unrecognized Unrecognized Fair Cost Gains Losses Value Mortgage-backed securities $ 84,983 $ — $ 2,462 $ 82,521 Municipal securities 131,850 799 2,991 129,658 Total held to maturity debt securities $ 216,833 $ 799 $ 5,453 $ 212,179
Available-for-sale Securities [Member]
Fair Value and Amortized Cost of Investment Securities by Contractual Maturity	The fair value and amortized cost of available for sale debt securities at year end 2019 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 available for sale: Value Cost Due in one year or less $ 2,216 $ 2,193 Due after one year through five years 4,098 3,973 Due after five years through ten years 35,872 35,206 Due after ten years through thirty years 77,296 72,433 Mortgage-backed securities 1,767,242 1,742,221 Total available for sale debt securities $ 1,886,724 $ 1,856,026
Investments Gross Unrealized Losses and Fair Value	The following tables show the Company’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position, at December 31, 2019 and 2018. December 31, 2019 Less than 12 months 12 months or more Total Unrealized Unrealized Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Obligations of U.S. government sponsored entities and agencies $ 19,930 $ 70 $ — $ — $ 19,930 $ 70 Mortgage-backed securities 125,249 388 117,903 994 243,152 1,382 Total temporarily impaired available for sale debt securities $ 145,179 $ 458 $ 117,903 $ 994 $ 263,082 $ 1,452 December 31, 2018 Less than 12 months 12 months or more Total Unrealized Unrealized Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Obligations of U.S. government sponsored entities and agencies $ 25,104 $ 332 $ 9,398 $ 601 $ 34,502 $ 933 Mortgage-backed securities 647,923 10,782 635,172 22,641 1,283,095 33,423 Municipal securities 25,031 316 3,381 19 28,412 335 Total temporarily impaired available for sale debt securities $ 698,058 $ 11,430 $ 647,951 $ 23,261 $ 1,346,009 $ 34,691
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 debt securities at year end 2019 by contractual maturity were as follows. Mortgage-backed securities are not due at a single maturity date and are shown separately. Amortized Investment securities held to maturity Fair Value Cost Due after five years through ten years $ 2,064 $ 2,031 Due after ten years through thirty years 134,801 129,312 Mortgage-backed securities 71,987 71,560 Total held to maturity debt securities $ 208,852 $ 202,903
Investments Gross Unrealized Losses and Fair Value	The following tables show the Company’s held to maturity debt 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 December 31, 2019 and 2018. December 31, 2019 Less than 12 months 12 months or more Total Unrealized Unrealized Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Mortgage-backed securities $ — $ — $ 8,445 $ 29 $ 8,445 $ 29 Total temporarily impaired held to maturity debt securities $ — $ — $ 8,445 $ 29 $ 8,445 $ 29 December 31, 2018 Less than 12 months 12 months or more Total Unrealized Unrealized Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Mortgage-backed securities $ — $ — $ 82,521 $ 2,462 $ 82,521 $ 2,462 Municipal securities 22,560 203 47,807 2,788 70,367 2,991 Total temporarily impaired held to maturity debt securities $ 22,560 $ 203 $ 130,328 $ 5,250 $ 152,888 $ 5,453

Loans Held for Sale (Tables)

Loans Held for Sale (Tables)	12 Months Ended
	Dec. 31, 2019
Receivables Held For Sale [Abstract]
Summary of Activity in Mortgage Loans Held for Sale	The table below summarizes the activity in mortgage loans held for sale for the years ended December 31, 2019 and 2018. December 31, 2019 2018 Beginning balance $ 40,399 $ 19,647 Effect from acquisitions 14,588 8,959 Loans originated 1,157,356 403,492 Proceeds from sales (1,100,207 ) (403,583 ) Net change in fair value 1,174 1,081 Net realized gain on sales 29,491 10,803 Ending balance $ 142,801 $ 40,399
Summary of Components of Mortgage Banking Revenue	The table below summarizes the main components of Mortgage Banking Revenue as reported in the Company’s Consolidated Statements of Income and Comprehensive Income during the years ended December 31, 2019 and 2018 . 2019 2018 Servicing fees and commissions $ 358 $ 196 Gain on sale of loans held for sale 29,491 10,803 Unrealized gain on loans held for sale 1,174 1,081 Net gain on mortgage derivatives 494 614 Loss on mortgage hedge (1,731 ) (46 ) Loss on mortgage servicing assets (233 ) (38 ) Mortgage banking revenue $ 29,553 $ 12,610
Summary of Notional Amounts for Interest Rate Lock Commitments, 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 December 31, 2019 and 2018. Notional at December 31, 2019 December 31, 2018 Interest rate lock commitments $ 125,409 $ 49,545 Best efforts forward trades 123,638 61,865 MBS forward trades 119,500 30,000 Total derivative instruments $ 368,547 $ 141,410

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2019
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 December 31, 2019 and 2018 are: December 31, 2019 December 31, 2018 Loans excluding PCI loans Real estate loans Residential $ 2,512,544 $ 1,702,114 Commercial 6,325,108 4,454,098 Land, development and construction 999,923 635,562 Total real estate 9,837,575 6,791,774 Commercial, industrial & factored receivables 1,759,074 1,183,380 Consumer and other loans 247,307 203,686 Loans before unearned fees and deferred cost 11,843,956 8,178,840 Net unearned fees and costs 4,519 2,693 Total loans excluding PCI loans 11,848,475 8,181,533 PCI loans (note 1) Real estate loans Residential 45,795 58,804 Commercial 81,576 87,336 Land, development and construction 4,655 7,028 Total real estate 132,026 153,168 Commercial and industrial 3,342 5,594 Consumer and other loans 100 209 Total PCI loans 135,468 158,971 Total loans 11,983,943 8,340,504 Allowance for loan losses for loans that are not PCI loans (40,429 ) (39,579 ) Allowance for loan losses for PCI loans (226 ) (191 ) Total loans, net of allowance for loan losses $ 11,943,288 $ 8,300,734 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 following tables present the activity in the allowance for loan losses by portfolio segment for the years ended December 31, 2019, 2018 and 2017. Real Estate Loans Residential Commercial Land, Develop., Constr. Comm., Industrial & Factored Receivables Consumer & Other Total Allowance for loan losses for loans that are not PCI loans: Twelve-month ended December 31, 2019 Beginning of the period $ 5,518 $ 22,978 $ 1,781 $ 6,414 $ 2,888 $ 39,579 Charge-offs (721 ) (567 ) (42 ) (9,545 ) (3,182 ) (14,057 ) Recoveries 710 1,057 85 1,934 571 4,357 Provision for loan losses (1,250 ) (4,916 ) 495 12,479 3,742 10,550 Balance at end of period $ 4,257 $ 18,552 $ 2,319 $ 11,282 $ 4,019 $ 40,429 Twelve-month ended December 31, 2018 Beginning of the period $ 6,003 $ 19,304 $ 1,179 $ 4,130 $ 1,914 $ 32,530 Charge-offs (516 ) (13 ) (126 ) (1,474 ) (1,706 ) (3,835 ) Recoveries 1,027 679 39 360 327 2,432 Provision for loan losses (996 ) 3,008 689 3,398 2,353 8,452 Balance at end of period $ 5,518 $ 22,978 $ 1,781 $ 6,414 $ 2,888 $ 39,579 Twelve-month ended December 31, 2017 Beginning of the period $ 5,640 $ 14,713 $ 883 $ 3,785 $ 1,548 $ 26,569 Charge-offs (254 ) (74 ) — (677 ) (994 ) (1,999 ) Recoveries 950 662 596 334 217 2,759 Provision for loan losses (333 ) 4,003 (300 ) 688 1,143 5,201 Balance at end of period $ 6,003 $ 19,304 $ 1,179 $ 4,130 $ 1,914 $ 32,530 Real Estate Loans Residential Commercial Land, Develop., Constr. Comm., Industrial & Factored Receivables Consumer & Other Total Allowance for loan losses for loans that are PCI loans: Twelve-month ended December 31, 2019 Beginning of the period $ — $ — $ 177 $ — $ 14 $ 191 Charge-offs — — — — — — Recoveries — — — — — — Provision for loan losses — — — — 35 35 Balance at end of period $ — $ — $ 177 $ — $ 49 $ 226 Twelve-month ended December 31, 2018 Beginning of the period $ — $ 59 $ 222 $ — $ 14 $ 295 Charge-offs — — — (10 ) — (10 ) Recoveries — — — 75 — 75 Provision for loan losses — (59 ) (45 ) (65 ) — (169 ) Balance at end of period $ — $ — $ 177 $ — $ 14 $ 191 Twelve-month ended December 31, 2017 Beginning of the period $ 54 $ 92 $ 312 $ — $ 14 $ 472 Charge-offs — — — — — — Recoveries — 66 — — — 66 Provision for loan losses (54 ) (99 ) (90 ) — — (243 ) Balance at end of period $ — $ 59 $ 222 $ — $ 14 $ 295
Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method	The following table presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of December 31, 2019 and 2018. Accrued interest receivable and unearned fees/costs are not included in the recorded investment because they are not material. Real Estate Loans Residential Commercial Land, Develop., Constr. Comm., Industrial & Factored Receivables Consumer & Other Total As of December 31, 2019 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 588 $ 375 $ — $ 914 $ 1 $ 1,878 Collectively evaluated for impairment 3,669 18,177 2,319 10,368 4,018 38,551 Purchased credit impaired — — 177 — 49 226 Total ending allowance balance $ 4,257 $ 18,552 $ 2,496 $ 11,282 $ 4,068 $ 40,655 Loans: Individually evaluated for impairment $ 6,475 $ 11,445 $ 865 $ 7,232 $ 123 $ 26,140 Collectively evaluated for impairment 2,506,069 6,313,663 999,058 1,751,842 247,184 11,817,816 Purchased credit impaired 45,795 81,576 4,655 3,342 100 135,468 Total ending loan balances $ 2,558,339 $ 6,406,684 $ 1,004,578 $ 1,762,416 $ 247,407 $ 11,979,424 Real Estate Loans Residential Commercial Land, Develop., Constr. Comm. & Industrial Consumer & Other Total As of December 31, 2018 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 331 $ 250 $ — $ 1,034 $ 1 $ 1,616 Collectively evaluated for impairment 5,187 22,728 1,781 5,380 2,887 37,963 Purchased credit impaired — — 177 — 14 191 Total ending allowance balance $ 5,518 $ 22,978 $ 1,958 $ 6,414 $ 2,902 $ 39,770 Loans: Individually evaluated for impairment $ 6,234 $ 7,496 $ 117 $ 1,708 $ 145 $ 15,700 Collectively evaluated for impairment 1,695,880 4,446,602 635,445 1,181,672 203,541 8,163,140 Purchased credit impaired 58,804 87,336 7,028 5,594 209 158,971 Total ending loan balances $ 1,760,918 $ 4,541,434 $ 642,590 $ 1,188,974 $ 203,895 $ 8,337,811
Summary of Impaired Loans	The following is a summary of information regarding impaired loans at December 31, 2019 and 2018: December 31, 2019 December 31, 2018 Performing TDRs (these are not included in nonperforming loans ("NPLs")) $ 8,012 $ 8,475 Nonperforming TDRs (these are included in NPLs) 4,512 1,002 Total TDRs (these are included in impaired loans) 12,524 9,477 Impaired loans that are not TDRs 13,616 6,223 Total impaired loans $ 26,140 $ 15,700
Troubled Debt Restructured Loans by Loans Type	TDRs as of December 31, 2019 and 2018 quantified by loan type classified separately as accrual (performing loans) and non-accrual (non-performing loans) are presented in the table below. Accruing Non-Accrual Total As of December 31, 2019 Real estate loans: Residential $ 4,862 $ 1,147 $ 6,009 Commercial 1,706 — 1,706 Land, development, construction 175 — 175 Total real estate loans 6,743 1,147 7,890 Commercial and industrial 1,146 3,365 4,511 Consumer and other 123 — 123 Total TDRs $ 8,012 $ 4,512 $ 12,524 Accruing Non-Accrual Total As of December 31, 2018 Real estate loans: Residential $ 5,848 $ 386 $ 6,234 Commercial 1,837 566 2,403 Land, development, construction 77 41 118 Total real estate loans 7,762 993 8,755 Commercial and industrial 577 — 577 Consumer and other 136 9 145 Total TDRs $ 8,475 $ 1,002 $ 9,477
Summary of Loans by Class Modified	The following table presents loans by class modified as TDRs for which there was a payment default within twelve months following the modification during the years ending December 31, 2019, 2018 and 2017. Period ending Period ending Period ending December 31, 2019 December 31, 2018 December 31, 2017 Number Recorded Number Recorded Number Recorded of loans investment of loans investment of loans investment Residential — $ — — $ — — $ — Commercial real estate — — 1 433 1 177 Land, development, construction — — 1 49 — — Commercial and industrial — — — — — — Consumer and other — — — — — — Total — $ — 2 $ 482 1 $ 177
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 December 31, 2019 and 2018 excluding purchased credit-impaired loans accounted for pursuant to ASC Topic 310-30. The recorded investment is less than the unpaid principal balance primarily due to partial charge-offs. Unpaid principal balance Recorded investment Allowance for loan losses allocated As of December 31, 2019 With no related allowance recorded: Residential real estate $ 2,894 $ 2,744 $ — Commercial real estate 11,031 10,015 — Land, development, construction 886 865 — Commercial and industrial 5,522 4,820 — Consumer, other 99 98 — With an allowance recorded: Residential real estate 3,920 3,731 588 Commercial real estate 1,438 1,430 375 Land, development, construction — — — Commercial and industrial 2,486 2,412 914 Consumer, other 31 25 1 Total $ 28,307 $ 26,140 $ 1,878 Unpaid principal balance Recorded investment Allowance for loan losses allocated As of December 31, 2018 With no related allowance recorded: Residential real estate $ 3,608 $ 3,485 $ — Commercial real estate 6,447 5,906 — Land, development, construction 144 117 — Commercial and industrial 364 353 — Consumer, other 109 108 — With an allowance recorded: Residential real estate 2,897 2,749 331 Commercial real estate 1,593 1,590 250 Land, development, construction — — — Commercial and industrial 1,378 1,355 1,034 Consumer, other 53 37 1 Total $ 16,593 $ 15,700 $ 1,616
Summary of Impairment by Class of Loans	Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized December 31, 2019 Real estate loans: Residential $ 6,153 $ 233 $ — Commercial 9,420 102 — Land, development, construction 216 8 — Total real estate loans 15,789 343 — Commercial and industrial 5,446 59 — Consumer and other loans 126 8 — Total $ 21,361 $ 410 $ — Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized December, 31, 2018 Real estate loans: Residential $ 7,492 $ 308 $ — Commercial 7,876 104 — Land, development, construction 588 8 — Total real estate loans 15,956 420 — Commercial and industrial 2,081 33 — Consumer and other loans 174 8 — Total $ 18,211 $ 461 $ — Average of impaired loans Interest income recognized during impairment Cash basis interest income recognized December, 31, 2017 Real estate loans: Residential $ 7,731 $ 267 $ — Commercial 8,956 145 — Land, development, construction 432 18 — Total real estate loans 17,119 430 — Commercial and industrial 1,968 29 — Consumer and other loans 240 10 — Total $ 19,327 $ 469 $ —
Summary of Recorded Investment in Non-accrual Loans and Loans Past Due Over 90 Days Still on Accrual by Class of Loans	The following tables present the recorded investment in non-accrual loans and loans past due over 90 days still on accrual by class of loans as of December 31, 2019 and 2018 excluding purchased credit-impaired loans accounted for pursuant to ASC Topic 310-30: Non-accrual Loans Past Due Over 90 Days Still Accruing As of December 31, 2019 Residential real estate $ 13,455 $ — Commercial real estate 12,141 — Land, development, construction 2,516 — Comm., industrial & factored receivables 7,884 1,692 Consumer, other 920 — Total $ 36,916 $ 1,692 Non-accrual Loans Past Due Over 90 Days Still Accruing As of December 31, 2018 Residential real estate $ 11,488 $ — Commercial real estate 8,445 — Land, development, construction 795 — Commercial and industrial 2,274 — Consumer, other 565 — Total $ 23,567 $ —
Summary of Aging of Recorded Investment in Past Due Loans	The following tables present the aging of the recorded investment in past due loans as of December 31, 2019 and 2018, excluding purchased credit-impaired loans accounted for pursuant to ASC Topic 310-30: 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, 2019 Residential real estate $ 2,512,544 $ 7,601 $ 5,928 $ — $ 13,529 $ 2,485,560 $ 13,455 Commercial real estate 6,325,108 7,554 2,577 — 10,131 6,302,836 12,141 Land, development, construction 999,923 1,343 2,349 — 3,692 993,715 2,516 Comm., industrial & factored receivables 1,759,074 14,924 12,465 1,692 29,081 1,722,109 7,884 Consumer 247,307 1,663 907 — 2,570 243,817 920 $ 11,843,956 $ 33,085 $ 24,226 $ 1,692 $ 59,003 $ 11,748,037 $ 36,916 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, 2018 Residential real estate $ 1,702,114 $ 5,730 $ 5,631 $ — $ 11,360 $ 1,679,266 $ 11,488 Commercial real estate 4,454,098 10,840 4,607 — 15,446 4,430,207 8,445 Land, development, construction 635,562 661 4,022 — 4,683 630,084 795 Comm. & industrial 1,183,380 2,803 878 — 3,681 1,177,425 2,274 Consumer 203,686 1,061 271 — 1,332 201,789 565 $ 8,178,840 $ 21,094 $ 15,408 $ — $ 36,502 $ 8,118,771 $ 23,567
Risk Category of Loans by Class of Loans, Excluding Purchased Credit Impaired Loans	As of December 31, 2019 Loan Category Pass Special Mention Substandard Doubtful Residential real estate $ 2,455,752 $ 31,189 $ 25,603 $ — Commercial real estate 6,151,309 118,412 55,387 — Land, development, construction 989,860 6,418 3,645 — Comm., industrial & factored receivables 1,705,862 35,070 18,142 — Consumer 245,905 160 1,242 — Total $ 11,548,688 $ 191,249 $ 104,019 $ — As of December 31, 2018 Loan Category Pass Special Mention Substandard Doubtful Residential real estate $ 1,633,810 $ 41,522 $ 26,782 $ — Commercial real estate 4,246,687 160,981 46,430 — Land, development, construction 610,631 20,586 4,345 — Comm. & industrial 1,137,272 40,836 5,272 — Consumer 202,701 247 738 — Total $ 7,831,100 $ 264,172 $ 83,568 $ —
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 accounted for pursuant to ASC Topic 310-30, based on payment activity as of December 31, 2019 and 2018: Residential Consumer As of December 31, 2019 Performing $ 2,499,089 $ 246,387 Nonperforming 13,455 920 Total $ 2,512,544 $ 247,307 Residential Consumer As of December 31, 2018 Performing $ 1,690,626 $ 203,121 Nonperforming 11,488 565 Total $ 1,702,114 $ 203,686
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 December 31, 2019, 2018 and 2017. Contractually required principal and interest payments have been adjusted for estimated prepayments. December 31, 2019 2018 2017 Contractually required principal and interest $ 244,189 $ 267,815 $ 248,283 Non-accretable difference (46,271 ) (38,602 ) (13,183 ) Cash flows expected to be collected 197,918 229,213 235,100 Accretable yield (62,450 ) (70,242 ) (70,942 ) Carrying value of acquired loans 135,468 158,971 164,158 Allowance for loan losses (226 ) (191 ) (295 ) Carrying value less allowance for loan losses $ 135,242 $ 158,780 $ 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 periods ending December 31, 2019, 2018 and 2017. Effect of Income All Other Dec. 31, 2018 Acquisitions Accretion Adjustments Dec. 31, 2019 Contractually required principal and interest $ 267,815 $ 51,527 $ — $ (75,153 ) $ 244,189 Non-accretable difference (38,602 ) (29,187 ) — 21,518 (46,271 ) Cash flows expected to be collected 229,213 22,340 — (53,635 ) 197,918 Accretable yield (70,242 ) (3,724 ) 33,766 (22,250 ) (62,450 ) Carry value of acquired loans $ 158,971 $ 18,616 $ 33,766 $ (75,885 ) $ 135,468 Effect of Income All Other Dec. 31, 2017 Acquisitions Accretion Adjustments Dec. 31, 2018 Contractually required principal and interest $ 248,283 $ 122,392 $ — $ (102,860 ) $ 267,815 Non-accretable difference (13,183 ) (58,927 ) — 33,508 (38,602 ) Cash flows expected to be collected 235,100 63,465 — (69,352 ) 229,213 Accretable yield (70,942 ) (7,770 ) 35,944 (27,474 ) (70,242 ) Carry value of acquired loans $ 164,158 $ 55,695 $ 35,944 $ (96,826 ) $ 158,971 Effect of Income All Other Dec. 31, 2016 Acquisitions Accretion Adjustments Dec. 31, 2017 Contractually required principal and interest $ 297,821 $ 31,334 $ — $ (80,872 ) $ 248,283 Non-accretable difference (18,372 ) (7,104 ) — 12,293 (13,183 ) Cash flows expected to be collected 279,449 24,230 — (68,579 ) 235,100 Accretable yield (93,525 ) (4,185 ) 32,388 (5,620 ) (70,942 ) Carry value of acquired loans $ 185,924 $ 20,045 $ 32,388 $ (74,199 ) $ 164,158

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2019
Real Estate [Abstract]
Activity of Valuation Allowance in Other Real Estate Owned and Expense Related to Foreclosed Assets	Other real estate owned is real estate acquired through or instead of loan foreclosure. Activity in the valuation allowance was as follows: 2019 2018 2017 Beginning of year $ 404 $ 861 $ 869 Valuation write down of OREO 395 482 682 Sales and/or dispositions (284 ) (939 ) (690 ) End of year $ 515 $ 404 $ 861 Expenses related to foreclosed real estate include: 2019 2018 2017 Gain on sale of OREO $ (428 ) $ (1,933 ) $ (876 ) Valuation write down of repossessed real estate 395 482 682 Operating expenses, net of rental income 3,221 2,815 2,252 Total $ 3,188 $ 1,364 $ 2,058

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2019
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 December 31,2019 Assets: Trading securities $ 4,987 $ — $ 4,987 $ — Available for sale debt securities Corporate debt securities 5,657 — 5,657 — Obligations of U.S. government sponsored entities and agencies 19,930 — 19,930 — Mortgage-backed securities 1,767,242 — 1,767,242 — Municipal securities 93,895 — 93,895 — Loans held for sale 142,801 — 142,801 — Mortgage servicing assets 1,332 — 1,332 — Mortgage banking derivatives 1,761 — 14 1,747 Interest rate swap derivatives 273,068 — 273,068 — Liabilities: Mortgage banking derivatives 305 — 288 17 Interest rate swap derivatives 275,033 — 275,033 — at December 31,2018 Assets: Trading securities $ 1,737 $ — $ 1,737 $ — Available for sale debt securities Corporate debt securities 6,427 — 6,427 — Obligations of U.S. government sponsored entities and agencies 37,868 — 37,868 — Mortgage-backed securities 1,594,275 — 1,594,275 — Municipal securities 88,778 — 88,778 — Loans held for sale 40,399 — 40,399 — Mortgage servicing assets 1,565 — 1,565 — Mortgage banking derivatives 783 — — 783 Interest rate swap derivatives 92,475 — 92,475 — Liabilities: Mortgage banking derivatives 169 — 164 5 Interest rate swap derivatives 92,892 — 92,892 —
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 Quoted prices Significant in active other Significant markets for observable unobservable Carrying identical assets inputs inputs value (Level 1) (Level 2) (Level 3) at December 31,2019 Assets: Impaired loans Residential real estate $ 2,213 $ — $ — $ 2,213 Commercial real estate 8,177 — — 8,177 Land, land development and construction 847 — — 847 Commercial 5,564 — — 5,564 Consumer 47 — — 47 Other real estate owned Commercial real estate 2,129 — — 2,129 Land, land development and construction 340 — — 340 Bank property held for sale 4,160 — — 4,160 at December 31,2018 Assets: Impaired loans Residential real estate $ 1,811 $ — $ — $ 1,811 Commercial real estate 5,614 — — 5,614 Land, land development and construction 90 — — 90 Commercial 1,274 — — 1,274 Consumer 40 — — 40 Other real estate owned Land, land development and construction 867 — — 867 Bank property held for sale 5,805 — — 5,805
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 Carrying amount Level 1 Level 2 Level 3 Total at December 31,2019 Financial assets: Cash and cash equivalents $ 490,058 $ 490,058 $ — $ — $ 490,058 Trading securities 4,987 — 4,987 — 4,987 Available for sale debt securities 1,886,724 — 1,886,724 — 1,886,724 Held to maturity debt securities 202,903 — 208,852 — 208,852 Loans held for sale 142,801 — 142,801 — 142,801 Loans, net 11,943,288 — — 11,925,693 11,925,693 Mortgage servicing assets 1,332 — 1,332 — 1,332 Mortgage banking derivatives 1,761 — 14 1,747 1,761 Interest rate swap derivatives 273,068 — 273,068 — 273,068 Accrued interest receivable 40,945 — 7,547 33,398 40,945 Financial liabilities: Deposits - without stated maturities $ 10,879,837 $ 10,879,837 $ — $ — $ 10,879,837 Deposits - with stated maturities 2,256,555 — 2,271,497 — 2,271,497 Securities sold under agreement to repurchase 93,141 — 93,141 — 93,141 Federal funds purchased and other borrowings 540,193 — 540,193 — 540,193 Corporate and subordinated debentures 71,343 — — 66,964 66,964 Mortgage banking derivatives 305 — 288 17 305 Interest rate swap derivatives 275,033 — 275,033 — 275,033 Accrued interest payable 3,998 — 3,998 — 3,998 Fair value measurements Carrying amount Level 1 Level 2 Level 3 Total at December 31,2018 Financial assets: Cash and cash equivalents $ 367,333 $ 367,333 $ — $ — $ 367,333 Trading securities 1,737 — 1,737 — 1,737 Available for sale debt securities 1,727,348 — 1,727,348 — 1,727,348 Held to maturity debt securities 216,833 — 212,179 — 212,179 Loans held for sale 40,399 — 40,399 — 40,399 Loans, net 8,300,734 — — 8,342,220 8,342,220 Mortgage servicing assets 1,565 — 1,565 — 1,565 Mortgage banking derivatives 783 — — 783 783 Interest rate swap derivatives 92,475 — 92,475 — 92,475 Accrued interest receivable 33,143 — 8,355 24,788 33,143 Financial liabilities: Deposits - without stated maturities $ 7,655,376 $ 7,655,376 $ — $ — $ 7,655,376 Deposits - with stated maturities 1,821,960 — 1,827,299 — 1,827,299 Securities sold under agreement to repurchase 57,772 — 57,772 — 57,772 Federal funds purchased and other borrowings 655,360 — 655,360 — 655,360 Corporate debentures 32,415 — — 28,621 28,621 Mortgage banking derivatives 169 — 164 5 169 Interest rate swap derivatives 92,892 — 92,892 — 92,892 Accrued interest payable 2,627 — 2,627 — 2,627

Bank Premises and Equipment (Ta

Bank Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Property Plant And Equipment [Abstract]
Summary of Bank Premises and Equipment	A summary of bank premises and equipment as of December 31, 2019 and 2018 is as follows: December 31, 2019 2018 Land $ 89,973 $ 72,487 Land improvements 1,560 1,381 Buildings 174,344 130,424 Leasehold improvements 19,076 13,655 Furniture, fixtures and equipment 68,148 45,056 Construction in progress 10,821 15,491 Subtotal 363,922 278,494 Less: accumulated depreciation 67,216 51,040 Total $ 296,706 $ 227,454

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Change in Balance for Goodwill	The change in balance for goodwill during the December 31, 2019, 2018 and 2017 is as follows: 2019 2018 2017 Beginning of year $ 802,880 $ 257,683 $ 106,028 Acquired goodwill 401,537 545,197 151,655 Impairment — — — End of year $ 1,204,417 $ 802,880 $ 257,683
Change in Balance for Core Deposit Intangibles and Trust Intangible Assets	The change in balance for the CDI and Trust intangible assets during the years 2019, 2018 and 2017 is as follows: 2019 2018 2017 Beginning of year $ 66,225 $ 24,063 $ 16,209 Acquired CDI 39,900 51,945 12,424 Amortization expense on CDI and Trust (14,968 ) (9,783 ) (3,997 ) Disposal of Trust intangible asset — — (573 ) End of year $ 91,157 $ 66,225 $ 24,063
Schedule of Core Deposit Intangible Assets	CDI intangible assets for years ended December 31, 2019 and 2018 were as follows: December 31, 2019 December 31, 2018 Gross Gross Carrying Accumulated Carrying Accumulated Amount Amortization Amount Amortization Amortized intangible assets: Core deposit intangibles $ 133,864 $ 42,707 $ 93,964 $ 27,739 Total acquired intangibles $ 133,864 $ 42,707 $ 93,964 $ 27,739
Estimated Amortization Expense	Estimated amortization expense for each of the next five years: CDI 2020 $ 14,423 2021 12,438 2022 11,083 2023 10,688 2024 9,928
Schedule of Activity for Mortgage Servicing Assets Related Valuation Allowance	Activity for MSA and the related valuation allowance follows: 2019 2018 Beginning of year $ 1,565 $ — Effect from acquisitions — 1,602 Changes in fair value (233 ) (37 ) End of year $ 1,332 $ 1,565
Schedule of Activity for Small Business Administration Servicing Assets	Activity for SBA servicing assets is as follows: 2019 2018 Beginning of year $ 1,388 $ 551 Additions 1,268 846 Effect from acquisitions 1,581 226 Amortized to expense (1,062 ) (235 ) End of year $ 3,175 $ 1,388

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2019
Banking And Thrift [Abstract]
Summary of Deposits	A detail of deposits at December 31, 2019 and 2018 is as follows: December 31, Weighted Weighted Average Average Interest Interest 2019 Rate 2018 Rate Non-interest bearing deposits $ 3,929,183 — % $ 2,923,640 — % Interest bearing deposits: Interest bearing demand deposits 2,613,933 0.4 % 1,811,006 0.3 % Savings deposits 811,150 0.3 % 704,159 0.1 % Money market accounts 3,525,571 1.0 % 2,216,571 0.9 % Time deposits less than $100,000 966,040 1.7 % 871,043 1.6 % Time deposits of $100,000 or greater 1,290,515 1.9 % 950,917 1.6 % $ 13,136,392 0.7 % $ 9,477,336 0.6 %
Summary of Certificate Accounts	The following table presents the amount of certificate accounts at December 31, 2019, maturing during the periods reflected below: Year Amount 2020 $ 1,896,281 2021 216,494 2022 64,737 2023 46,607 2024 31,559 Thereafter 877 Total $ 2,256,555

Securities Sold Under Agreeme_2

Securities Sold Under Agreements to Repurchase (Tables)	12 Months Ended
	Dec. 31, 2019
Banking And Thrift [Abstract]
Summary of Repurchase Agreement	The following tables provide additional details as of December 31, 2019 and 2018. MBS Municipal Securities Securities Total As of December 31, 2019 Market value of securities pledged $ 130,942 $ 451 $ 131,394 Borrowings related to pledged amounts 92,953 188 93,141 Market value pledged as a % of borrowings 141 % 240 % 141 % MBS Municipal Securities Securities Total As of December 31, 2018 Market value of securities pledged $ 64,269 $ 437 $ 64,706 Borrowings related to pledged amounts 57,594 178 57,772 Market value pledged as a % of borrowings 112 % 246 % 112 % Information concerning repurchase agreements is summarized as follows: 2019 2018 2017 Average daily balance during the year $ 73,314 $ 54,344 $ 43,850 Average interest rate during the year 1.51 % 1.16 % 0.56 % Maximum month-end balance during the year $ 93,141 $ 59,751 $ 52,080 Weighted average interest rate at year end 1.30 % 1.66 % 0.88 %

Federal Funds Purchased (Tables

Federal Funds Purchased (Tables)	12 Months Ended
	Dec. 31, 2019
Banking And Thrift [Abstract]
Federal Funds Purchased, Overnight Deposits from Correspondent Banks	Information concerning these deposits is summarized as follows: 2019 2018 Average daily balance during the year $ 286,179 $ 250,499 Average interest rate during the period 2.29 % 2.02 % Maximum month-end balance during the year $ 379,193 $ 294,360 Weighted average interest rate at year end 1.68 % 2.07 %

Federal Home Loan Bank Advanc_2

Federal Home Loan Bank Advances and Other Borrowed Funds (Tables)	12 Months Ended
	Dec. 31, 2019
Banking And Thrift [Abstract]
Summary of Advances from Federal Home Loan Bank	From time to time, the Company borrows either through Federal Home Loan Bank (“FHLB”) advances or one-day borrowings, other than correspondent bank deposits listed in Note 12 above. At year-end, advances from the FHLB were as follows: 2019 2018 Fixed rate advances, maturity through 01/28/2019, rates from 2.45% and 2.54%, averaging 2.50% $ — $ 200,000 Floating rate advances, rates from 1.87% and 2.65%, as of December 31, 2019 and 2018, respectively 150,000 150,000 Total $ 150,000 $ 350,000

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Allocation of Federal and State Income Tax Expense (Benefit) Between Current and Deferred Portions	Allocation of federal and state income tax expense between current and deferred portions for the years ended December 31, 2019, 2018 and 2017, is as follows: Current Deferred Total December 31, 2019: Federal $ 34,182 $ 18,510 $ 52,692 State 9,275 5,731 15,006 $ 43,457 $ 24,241 $ 67,698 December 31, 2018: Federal $ 14,273 $ 16,843 $ 31,116 State 5,240 4,668 9,908 $ 19,513 $ 21,511 $ 41,024 December 31, 2017: Federal $ 18,243 $ 29,393 $ 47,636 State 4,045 1,799 5,844 $ 22,288 $ 31,192 $ 53,480
Components of Deferred Tax Assets and Deferred Tax Liabilities	The tax effect of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2019 and 2018, are presented below: December 31, 2019 2018 Deferred tax assets: Allowance for loan losses $ 10,178 $ 10,079 Stock based compensation 2,242 1,701 Deferred compensation 2,782 2,235 Impairment expenses 2,222 1,334 Net operating loss carryforward 19,812 18,313 Other real estate owned expenses 129 177 Fair value adjustments 6,979 17,929 Nonaccrual interest 2,996 2,890 Unrealized loss on interest rate swap 205 — Unrealized loss on available for sale debt securities — 7,611 Other 973 — Total deferred tax assets 48,518 62,269 Deferred tax liabilities: Premises and equipment, due to differences in depreciation methods and useful lives (8,702 ) (8,145 ) Deferred loan costs, net (1,131 ) (683 ) Unrealized gain on available for sale debt securities (7,685 ) — Investment in pass-through entity (184 ) — Prepaid expenses (2,030 ) (1,608 ) Like kind exchange — (197 ) Accretion of discounts on investments — (67 ) Other — (107 ) Total deferred tax liabilities (19,732 ) (10,807 ) Net deferred tax asset $ 28,786 $ 51,462
Summary of Net Operating Loss Carryforwards	At December 31, 2019, total net operating losses approximate $79,204, which includes $24,322 of net operating loss carry forwards generated subsequent to December 31, 2017 by institutions acquired by the Company as noted above. Effective January 1, 2018, net operating losses generated on January 1, 2018 and forward are no longer subject to a 20-year carryforward period and are carried indefinitely until fully utilized. Excluding the net operating losses not subject to expiration, the Company had approximately $54,882 of net operating loss carryforwards at December 31, 2019, which will begin to expire as follows: 2027 $ 1,318 2028 4,794 2029 7,060 2030 11,960 2031 5,524 2032 6,841 2033 13,350 2035 759 2036 3,276 $ 54,882
Reconciliation Between the Actual Tax Expense and the Expected Tax (Benefit) Expense	A reconciliation between the actual tax expense and the “expected” tax expense, computed by applying the U.S. federal corporate rate of 21 percent for 2019 and 2018 and 35 percent for 2017 is as follows: December 31, 2019 2018 2017 “Expected” tax expense $ 61,550 $ 41,466 $ 38,246 Tax exempt interest, net (3,661 ) (3,177 ) (4,104 ) Bank owned life insurance (1,834 ) (1,167 ) (1,251 ) State income taxes, net of federal income tax benefits 11,855 7,827 4,077 Stock based compensation 4 17 40 Merger and acquisition related expenses 348 610 1,049 Excess tax benefit from stock based compensation (838 ) (5,095 ) (3,007 ) Revaluation of net deferred tax asset due to change in federal income tax rate — — 18,575 Other, net 274 543 (145 ) $ 67,698 $ 41,024 $ 53,480

Related-Party Transactions (Tab

Related-Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Summary Loans to Principal Officers, Directors and Their Affiliates	Loans to principal officers, directors, and their affiliates during 2019 and 2018 were as follows: 2019 2018 Beginning balance $ 48,426 $ 30,458 New loans and advances on existing loans 1,605 39,183 Repayments (4,020 ) (21,215 ) Ending balance $ 46,011 $ 48,426

Regulatory Capital Matters (Tab

Regulatory Capital Matters (Tables)	12 Months Ended
	Dec. 31, 2019
Banking And Thrift [Abstract]
Summary of Actual, Required, and Capital Levels Necessary for Capital Adequacy Purposes	A summary of actual, required, and capital levels necessary for capital adequacy purposes for the Company as of December 31, 2019 and 2018, are presented in the table below. The ratios for capital adequacy purposes do not include capital conservation buffer requirements. To be well capitalized under For capital prompt corrective Actual adequacy purposes action provision Amount Ratio Amount Ratio Amount Ratio December 31, 2019 Total capital (to risk weighted assets) $ 1,672,911 12.2% $ 1,097,448 >8.0% n/a n/a Tier 1 capital (to risk weighted assets) 1,555,756 11.3% 823,086 >6.0% n/a n/a Common equity tier 1 capital (to risk weighted assets) 1,555,756 11.3% 617,315 >4.5% n/a n/a Tier 1 capital (to average assets) 1,555,756 9.7% 638,866 >4.0% n/a n/a December 31, 2018 Total capital (to risk weighted assets) $ 1,183,229 12.7% $ 745,543 >8.0% n/a n/a Tier 1 capital (to risk weighted assets) 1,143,459 12.3% 559,157 >6.0% n/a n/a Common equity tier 1 capital (to risk weighted assets) 1,104,959 11.9% 419,368 >4.5% n/a n/a Tier 1 capital (to average assets) 1,143,459 10.0% 455,561 >4.0% n/a n/a A summary of actual, required, and capital levels necessary for capital adequacy purposes in the case of the Company’s subsidiary bank as of December 31, 2019 and 2018, are presented in the table below. The ratios for capital adequacy purposes do not include capital conservation buffer requirements. To be well capitalized under For capital prompt corrective Actual adequacy purposes action provision Amount Ratio Amount Ratio Amount Ratio December 31, 2019 Total capital (to risk weighted assets) $ 1,670,678 12.2% $ 1,097,258 >8.0% $ 1,371,572 >10.0% Tier 1 capital (to risk weighted assets) 1,630,026 11.9% 822,943 >6.0% 1,097,258 >8.0% Common equity tier 1 capital (to risk weighted assets) 1,630,026 11.9% 617,207 >4.5% 891,522 >6.5% Tier 1 capital (to average assets) 1,630,026 10.2% 638,628 >4.0% 798,285 >5.0% December 31, 2018 Total capital (to risk weighted assets) $ 1,177,082 12.6% $ 745,003 >8.0% $ 931,254 >10.0% Tier 1 capital (to risk weighted assets) 1,137,315 12.2% 558,753 >6.0% 745,003 >8.0% Common equity tier 1 capital (to risk weighted assets) 1,137,315 12.2% 419,064 >4.5% 605,315 >6.5% Tier 1 capital (to average assets) 1,137,315 10.0% 455,515 >4.0% 569,394 >5.0%

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Stock Based Compensation Expense Recognized	The Company’s stock-based compensation consists of stock options, RSAs, RSUs and PSUs. During the twelve-month periods ended December 31, 2019, 2018 and 2017, the Company recognized total stock-based compensation expense as listed in the table below. 2019 2018 2017 Stock option expense $ 19 $ 83 $ 115 RSA expense 3,329 2,922 3,560 RSU Expense 843 538 287 PSU expense 958 650 624 Total stock-based compensation expense $ 5,149 $ 4,193 $ 4,586
Information Related to Stock Option Activity	2019 2018 2017 Total intrinsic value of stock options exercised $ 4,827 $ 1,492 $ 8,039 Net proceeds from stock options exercised $ 3,101 $ 14,707 $ 6,715 Gross income tax benefit from the exercise of stock options $ 723 $ 5,373 $ 1,545
Summary of Stock Option Activity	A summary of stock option and warrant activity for the years ended December 31, 2019, 2018 and 2017 is as follows: December 31, 2019 December 31, 2018 December 31, 2017 Weighted- Weighted- Weighted- Number of Average Average Average Options and Exercise Number of Exercise Number of Exercise Warrants Price Options Price Options Price Outstanding, beginning of period 655,261 $ 11.26 1,119,483 $ 11.26 623,490 $ 12.30 Options assumed pursuant to acquisition of (note 1): Gateway — — — — 1,150,517 11.32 HCBF — — 1,621,543 14.80 — — Sunshine — — 590,345 14.84 — — NCOM 487,365 10.99 — — — — Exercised (356,366 ) 10.82 (1,793,339 ) 13.61 (598,039 ) 12.11 Forfeited (102,404 ) 13.55 (882,771 ) 15.37 (56,485 ) 15.00 Outstanding, end of period 683,856 $ 10.94 655,261 $ 11.26 1,119,483 $ 11.26
Summary of Outstanding, Vested and Expected to Vest and Exercisable Stock Options	Weighted- Weighted- Average Average Aggregate Number of Exercise Contractual Intrinsic Options Price Term Value Options outstanding, December 31, 2019 683,856 $ 10.94 4.0 years $ 9,599 Options fully vested and expected to vest, December 31, 2019 681,718 $ 10.96 4.0 years $ 9,561 Options exercisable, December 31, 2019 675,356 $ 10.99 4.0 years $ 9,447
Summary of Restricted Stock Units	A summary of the RSU activity for the years ended December 31, 2019, 2018 and 2017 is presented in the table below.
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Restricted Stock Awards Activity	A summary of the RSA activity for the years ended December 31, 2019, 2018 and 2017 is presented in the table below. 2019 2018 2017 Number Number Weighted- Number Number Weighted- Number Number Weighted- of RSAs of RSAs average of RSAs of RSAs average of RSAs of RSAs average underlying underlying Total fair value underlying underlying Total fair value underlying underlying Total fair value shares not shares number at grant shares not shares number at grant shares not shares number at grant issued issued of RSAs date issued issued of RSAs date issued issued of RSAs date Outstanding, beginning period 339,766 50,600 390,366 $ 19.10 489,424 69,700 559,124 $ 15.89 572,064 127,901 699,965 $ 12.20 Granted 120,572 — 120,572 $ 26.33 67,502 — 67,502 $ 26.77 148,232 — 148,232 $ 24.94 Vested (149,318 ) (17,100 ) (166,418 ) $ 18.99 (214,847 ) (19,100 ) (233,947 ) $ 13.65 (226,606 ) (58,201 ) (284,807 ) $ 11.52 Forfeited (8,741 ) (1,000 ) (9,741 ) $ 22.78 (2,313 ) — (2,313 ) $ 18.55 (4,266 ) — (4,266 ) $ 15.76 Outstanding, end of period 302,279 32,500 334,779 $ 21.65 339,766 50,600 390,366 $ 19.10 489,424 69,700 559,124 $ 15.89
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Restricted Stock Units	December 31, 2019 December 31, 2018 December 31, 2017 Weighted- Weighted- Weighted- average average average fair value fair value fair value Number of at grant Number of at grant Number of at grant Units date Units date Units date Outstanding, beginning of period 128,447 $ 20.00 86,817 $ 17.00 54,376 $ 14.00 Granted 84,383 21.09 41,630 26.60 32,441 22.19 Vested and issued (8,547 ) 12.22 — — — — Forfeited (2,622 ) 23.45 — — — — Outstanding, end of period 201,661 $ 21.00 128,447 $ 20.00 86,817 $ 17.00

Parent Company Only Financial_2

Parent Company Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheet	Condensed financial statements of CenterState Bank Corporation (parent company only) are as follows: Condensed Balance Sheet December 31, 2019 and 2018 2019 2018 Assets: Cash and due from banks $ 5,168 $ 1,338 Inter-company receivable from bank subsidiary — 2,340 Investment in wholly-owned bank subsidiary 2,967,040 1,999,963 Investment in other wholly-owned subsidiary 3,431 2,761 Prepaid expenses and other assets 5,850 10,506 Total assets $ 2,981,489 $ 2,016,908 Liabilities: Accounts payable and accrued expenses $ 2,428 $ 2,149 Other borrowings 49,577 11,000 Corporate debenture 32,766 32,415 Total liabilities 84,771 45,564 Stockholders’ Equity: Common stock 1,252 957 Additional paid-in capital 2,407,385 1,699,031 Retained earnings 465,680 293,777 Accumulated other comprehensive income 22,401 (22,421 ) Total stockholders’ equity 2,896,718 1,971,344 Total liabilities and stockholders' equity $ 2,981,489 $ 2,016,908
Condensed Statements of Income	Condensed Statements of Operations Years ended December 31, 2019, 2018 and 2017 2019 2018 2017 Dividend income $ 144,209 $ 68,000 $ 10,000 Other income — 8 — Interest expense (4,374 ) (3,415 ) (1,363 ) Operating expenses (5,372 ) (3,988 ) (3,960 ) Income before equity in undistributed income of subsidiaries 134,463 60,605 4,677 Equity in undistributed income of subsidiaries 87,898 88,532 48,760 Net income before income tax benefit 222,361 149,137 53,437 Income tax benefit (3,035 ) (7,298 ) (2,358 ) Net income $ 225,396 $ 156,435 $ 55,795
Condensed Statements of Cash Flows	Condensed Statements of Cash Flows Years ended December 31, 2019, 2018 and 2017 2019 2018 2017 Cash flows from operating activities: Net income $ 225,396 $ 156,435 $ 55,795 Adjustments to reconcile net income to net cash used in operating activities: Undistributed net earnings of subsidiaries (87,898 ) (88,532 ) (48,760 ) (Decrease) increase in payables and accrued expenses (875 ) (13,385 ) 463 Decrease (increase) in other assets 9,783 3,998 (40,369 ) Stock based compensation expense — — 1,048 Net cash flows provided by (used in) operating activities 146,406 58,516 (31,823 ) Cash flows from investing activities: Inter-company receivables from subsidiary banks 3,143 (473 ) 25,145 Net cash from bank acquisition 34,941 (36,037 ) (42,601 ) Investment in subsidiaries — — (25,000 ) Cash payments to shareholders (84 ) 19,339 (90 ) Net cash flows provided by (used in) investing activities 38,000 (17,171 ) (42,546 ) Cash flows from financing activities: Stock options exercised, net of tax benefit 3,101 14,707 6,715 Stock repurchase (132,077 ) (1,027 ) (1,131 ) Stock issuance 800 650 — (Decrease) increase in other borrowings — (20,000 ) 20,000 Proceeds from stock offering, net of offering costs — — 63,262 Dividends paid to shareholders (52,400 ) (35,906 ) (13,878 ) Net cash flows (used in) provided by financing activities (180,576 ) (41,576 ) 74,968 Net increase (decrease) in cash and cash equivalent 3,830 (231 ) 599 Cash and cash equivalents at beginning of year 1,338 1,569 970 Cash and cash equivalents at end of year $ 5,168 $ 1,338 $ 1,569

Credit Commitments (Tables)

Credit Commitments (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Summary of Credit Commitments	A summary of commitments to extend credit and standby letters of credit written at December 31, 2019 and 2018, are as follows: December 31, 2019 2018 Standby letters of credit $ 46,905 $ 28,964 Available lines of credit 2,818,303 1,514,359 Unfunded loan commitments – fixed 257,277 153,680 Unfunded loan commitments – variable 118,291 65,880

Basic and Diluted Earnings Pe_2

Basic and Diluted Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
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. 2019 2018 2017 Basic Net income available to common shareholders $ 225,396 $ 156,435 $ 55,795 Less: Earnings allocated to participating securities (88 ) (116 ) (120 ) Net income allocated to common shareholders $ 225,308 $ 156,319 $ 55,675 Weighted average common shares outstanding including participating securities 119,793,869 87,707,196 57,368,322 Less: Participating securities (1) (46,920 ) (65,976 ) (123,624 ) Average shares 119,746,949 87,641,220 57,244,698 Basic earnings per common share $ 1.88 $ 1.78 $ 0.97 Diluted Net income available to common shareholders $ 225,308 $ 156,319 $ 55,675 Weighted average common shares outstanding for basic earnings per common share 119,746,949 87,641,220 57,244,698 Add: Dilutive effects of stock based compensation awards 856,874 1,117,633 1,096,115 Average shares and dilutive potential common shares 120,603,823 88,758,853 58,340,813 Diluted earnings per common share $ 1.87 $ 1.76 $ 0.95 note 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.

Reportable Segments (Tables)

Reportable Segments (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Reconciliation of Reportable Segment Revenues, Expenses and Profit	The tables below are reconciliations of the reportable segment revenues, expenses, and profit as viewed by management to the Company’s consolidated total for the year ending December 31, 2019, 2018 and 2017. Year ending December 31, 2019 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 667,428 $ 17,904 $ — $ — $ 685,332 Interest expense (85,225 ) (10,004 ) (4,375 ) — (99,604 ) Net interest income (expense) 582,203 7,900 (4,375 ) — 585,728 Provision for loan losses (10,277 ) (308 ) — — (10,585 ) Non-interest income 101,162 64,898 — — 166,060 Non-interest expense (406,187 ) (35,348 ) (5,372 ) — (446,907 ) Net income (loss) before taxes 266,901 37,142 (9,747 ) — 294,296 Income tax (provision) benefit (61,468 ) (9,265 ) 3,035 — (67,698 ) Noncontrolling interest (1,202 ) — — — (1,202 ) Net income (loss) $ 205,433 $ 27,877 $ (6,712 ) $ — $ 226,598 Total assets $ 16,364,434 $ 777,197 $ 2,981,489 $ (2,981,095 ) $ 17,142,025 Year ending December 31, 2018 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 445,688 $ 14,944 $ — $ — $ 460,632 Interest expense (36,853 ) (7,282 ) (3,415 ) — (47,550 ) Net interest income (expense) 408,835 7,662 (3,415 ) — 413,082 Provision for loan losses (7,914 ) (369 ) — — (8,283 ) Non-interest income 71,731 33,388 8 — 105,127 Non-interest expense (286,191 ) (22,288 ) (3,988 ) — (312,467 ) Net income (loss) before taxes 186,461 18,393 (7,395 ) — 197,459 Income tax (provision) benefit (43,662 ) (4,660 ) 7,298 — (41,024 ) Net income (loss) $ 142,799 $ 13,733 $ (97 ) $ — $ 156,435 Total assets $ 11,769,734 $ 561,885 $ 2,016,908 $ (2,010,939 ) $ 12,337,588 Year ending December 31, 2017 Correspondent Corporate Commercial banking and overhead and retail capital markets and Elimination banking division administration entries Total Interest income $ 240,583 $ 10,743 $ — $ — $ 251,326 Interest expense (11,431 ) (2,989 ) (1,363 ) — (15,783 ) Net interest income 229,152 7,754 (1,363 ) — 235,543 Provision for loan losses (5,037 ) 79 — — (4,958 ) Non-interest income 36,834 28,341 — — 65,175 Non-interest expense (161,946 ) (20,579 ) (3,960 ) — (186,485 ) Net income (loss) before taxes 99,003 15,595 (5,323 ) — 109,275 Income tax (provision) benefit (49,823 ) (6,015 ) 2,358 — (53,480 ) Net income (loss) $ 49,180 $ 9,580 $ (2,965 ) $ — $ 55,795 Total assets $ 6,572,636 $ 506,234 $ 957,253 $ (912,148 ) $ 7,123,975

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2019
Pro-Forma Financial Information of Acquisition	Pro-forma information for the twelve-month period ending December 31, 2018 assumes the Charter and NCOM acquisitions occurred at the beginning of 2018. Pro-forma data for the twelve-month period ending December 31, 2019 listed in the table below presents pro-forma information as if the NCOM acquisition occurred at the beginning of 2018. Years ended December 31, 2019 2018 Net interest income $ 620,072 $ 623,929 Net income available to common shareholders $ 257,271 $ 240,107 EPS - basic $ 2.01 $ 1.90 EPS - diluted $ 1.99 $ 1.87
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 HCBF 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 HCBF common stock outstanding at December 31, 2017 22,299,082 Cash consideration each HCBF 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 HCBF common shareholders $ 430,211 Fair value of HCBF stock options converted to CenterState stock options $ 18,025 Total Purchase Price for HCBF $ 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 Servicing asset 1,828 Core deposit intangible 19,795 Goodwill 197,648 Deferred tax asset 3,441 Other assets 17,644 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
National Commerce Corporation [Member]
Summary of Purchase Price Calculation	The table below summarizes the purchase price calculation. Number of shares of NCOM common stock outstanding at March 29, 2019 21,011,352 Per share exchange ratio 1.650 Number of shares of CenterState common stock less 763 of fractional shares 34,667,968 CenterState common stock price per share on March 29, 2019 $ 23.81 Fair value of CenterState common stock issued $ 825,444 Cash Consideration for 763 of fractional shares $ 20 Total Stock Consideration $ 825,444 Total Cash Consideration 20 Total consideration to be paid to NCOM common shareholders $ 825,464 Fair value of NCOM stock options converted to CenterState stock options 5,848 Fair value of NCOM warrants converted to CenterState warrants 384 Total Purchase Price for NCOM $ 831,696
Summary of Fair Value of Assets Purchased, Including Goodwill and Liabilities Assumed	Th e list below summarizes the fair value of the assets purchased, including goodwill, and liabilities assumed as of the April 1, 2019 purchase date. April 1, 2019 Assets: Cash and cash equivalents $ 268,524 Loans, held for investment 3,309,234 Purchased credit impaired loans 18,616 Loans held for sale 14,588 Investments 178,488 Accrued interest receivable 11,006 Branch real estate 61,295 Furniture and fixtures 7,204 Bank property held for sale 12,436 FHLB, FRB and other stock 17,076 Bank owned life insurance 55,474 Other real estate owned 875 Servicing asset 1,581 Core deposit intangible 39,900 Goodwill 401,537 Deferred tax asset 16,285 Other assets 23,663 Total assets acquired $ 4,437,782 Liabilities: Deposits $ 3,486,732 Securities sold under agreement to repurchase 18,833 Subordinated debt 38,802 Accrued interest payable 2,095 Other liabilities 47,622 Noncontrolling interest 12,002 Total liabilities assumed and noncontrolling interest $ 3,606,086
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, 2019 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 51,527 Non-accretable difference (29,187 ) Cash flows expected to be collected 22,340 Accretable yield (3,724 ) Total purchased credit-impaired loans acquired $ 18,616
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 Book Balance at acquisition date. Book Fair Balance Value Loans: Single family residential real estate $ 615,296 $ 608,705 Commercial real estate 1,762,480 1,736,653 Construction/development/land 363,005 358,643 Commercial loans 539,698 536,262 Consumer and other loans 70,058 68,971 Purchased credit-impaired 38,697 18,616 Total earning assets $ 3,389,234 $ 3,327,850

Interest Rate Swap Derivatives

Interest Rate Swap Derivatives (Tables)	12 Months Ended
	Dec. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary Information about the Derivative Instruments	Summary information about the derivative instruments is as follows: 2019 2018 Notional amount $ 10,596,427 $ 5,743,283 Weighted average pay rate on interest-rate swaps 3.20 % 3.64 % Weighted average receive rate on interest rate swaps 3.20 % 3.64 % Weighted average maturity (years) 11 11 Fair value of interest rate swap derivatives (asset) 273,068 92,475 Fair value of interest rate swap derivatives (liability) 274,216 92,892
Summary Information about Cash Flow Hedges Included in Condensed Consolidated Balance Sheets	The following table reflects the cash flow hedge included in the Condensed Consolidated Balance Sheets as of December 31, 2019: December 31, 2019 Notional amount $ 150,000 Fair value of interest rate swap derivatives (asset) — Fair value of interest rate swap derivatives (liability) 817
Summary Information about Net Unrealized Holding Losses in AOCI and Condensed Consolidated Statements of Income and Comprehensive Income Relating to Cash Flow Derivative Instrument	The following table presents the net unrealized holding losses recorded in Accumulated Other Comprehensive Income on the Company’s Condensed Consolidated Balance Sheet and Condensed Consolidated Statements of Income and Comprehensive Income relating to the cash flow derivative instrument for the nine-month period ended December 31, 2019: December 31, 2019 Amount of Amount of gain / (loss) Location of gain / (loss) loss reclassified from OCI reclassified from AOCI recognized in OCI to interest income to income Interest rate contracts - pay fixed, receive floating $ (613 ) $ — Interest expense: Federal funds purchased and other borrowings

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Schedule of Lessee Leases	December 31, 2019 Amortization of ROU Assets - Finance Leases $ 196 Interest on Lease Liabilities - Finance Leases 215 Operating Lease Cost (Cost resulting from lease payments) 7,453 Variable Lease Cost (Cost excluded from lease payments) 1,211 Total Lease Cost $ 9,075 Finance Lease - Operating Cash Flows 294 Finance Lease - Financing Cash Flows 294 Operating Lease - Operating Cash Flows (Fixed Payments) 7,585 Operating Lease - Operating Cash Flows (Liability Reduction) 7,131 New ROU Assets - Operating Leases 39,205 Weighted Average Lease Term (Years) - Finance Leases 10.93 Weighted Average Lease Term (Years) - Operating Leases 7.13 Weighted Average Discount Rate - Finance Leases 5.83 % Weighted Average Discount Rate - Operating Leases 3.33 %
Schedule of Maturity Analysis of Undiscounted Cash Flows of Operating Lease Liabilities	A maturity analysis of operating lease liabilities and reconciliation of the undiscounted cash flows to the total operating lease liabilities as of December 31, 2019 is as follows: December 31, 2019 Operating lease payments due: Within one year $ 7,577 After one but within two years 6,693 After two but within three years 5,358 After three but within four years 4,419 After four years but within five years 3,723 After five years 11,410 Total undiscounted cash flows 39,180 Discount on cash flows (4,695 ) Total operating lease liabilities $ 34,485
Schedule of Future Minimum Annual Rentals under All Leases	The following is a schedule of future minimum annual rentals under operating leases as of December 31, 2018: Year ending December 31, 2019 $6,524 2020 5,096 2021 4,411 2022 3,633 2023 2,558 Thereafter 11,088 $33,310
Schedule of Lessor Leases	December 31, 2019 Operating Lease Income from Lease Payments $ 1,793 Direct Financing Lease Income 513 Total Lease Income $ 2,306 Net Investment in Direct Financing Leases $ 1,391 Unguaranteed Residual Assets — Deferred Selling Profit on Direct Financing Leases — Maturity Analysis of Operating Lease Receivables 0 - 12 Months $ 1,978 13 - 24 Months 1,599 25 - 36 Months 897 37 - 48 Months 188 48 - 60 Months — Over 60 Months — Maturity Analysis of Finance Lease Receivables 0 - 12 Months $ 916 13 - 24 Months 475 25 - 36 Months — 37 - 48 Months — 48 - 60 Months — Over 60 Months —

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail)	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)CommunityBankClientSegments	Dec. 31, 2018USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Number of community bank clients | CommunityBankClient		650
Interest bearing deposits in other financial institutions, Maximum maturity period		1 year
Loans maximum value to be monitored by payment history for non-accrual status		$ 500,000
Loans minimum value of commercial, land, development and construction loans to be monitored for non-accrual status		$ 500,000
Non real estate consumer loans typically charged off		120 days
Loans individually evaluated for impairment		$ 26,140,000	$ 15,700,000
Number of loan portfolio segments | Segments		5
Tax benefit likelihood percentage		50.00%
Right-of-use operating lease assets		$ 32,163,000
Operating lease liabilities		34,485,000
One-time transition reduced retained earnings		(1,093,000)
Allowance for loans		40,655,000	$ 39,770,000
Accounting Standards Update 2016-02 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Right-of-use operating lease assets		20,311,000
Operating lease liabilities		22,795,000
One-time transition reduced retained earnings		$ 1,093,000
Core Deposits [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Useful life of intangible assets		10 years
Buildings [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Useful life of assets		39 years
Gulfstream Bancshares, Inc. [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Number of loan portfolio segments | Segments		5
Minimum [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for impairment		$ 500,000
Majority loans terms		3 years
Useful life of intangible assets		3 years
Minimum [Member] | Unfunded Commitments [Member] | Subsequent Event [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Reserve for potential losses	$ 5,000,000
Minimum [Member] | CECL [Member] | Subsequent Event [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance to loans percentage	55.00%
Allowance for loans	$ 65,000,000
Minimum [Member] | Purchased Credit Deteriorated Loans [Member] | Subsequent Event [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Estimated allowance	48,000,000
Minimum [Member] | Expected Credit Loss [Member] | Unfunded Commitments [Member] | Allowance For Credit Loss [Member] | Subsequent Event [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Reserve for debt securities	40,000,000
Minimum [Member] | Furniture, Fixtures and Equipment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Useful life of assets		3 years
Maximum [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Majority loans terms		5 years
Useful life of intangible assets		5 years
Maximum [Member] | Unfunded Commitments [Member] | Subsequent Event [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Reserve for potential losses	$ 10,000,000
Maximum [Member] | CECL [Member] | Subsequent Event [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance to loans percentage	70.00%
Allowance for loans	$ 84,000,000
Maximum [Member] | Purchased Credit Deteriorated Loans [Member] | Subsequent Event [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Estimated allowance	67,000,000
Maximum [Member] | Expected Credit Loss [Member] | Unfunded Commitments [Member] | Allowance For Credit Loss [Member] | Subsequent Event [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Reserve for debt securities	$ 58,000,000
Maximum [Member] | Furniture, Fixtures and Equipment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Useful life of assets		15 years

Trading Securities - Trading Se

Trading Securities - Trading Securities Portfolio Realized and Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Beginning balance	$ 1,737	$ 6,777
Purchases	194,799	254,555	$ 230,074
Proceeds from sales	(191,648)	(259,652)	(235,922)
Net realized gain on sales	96	20
Net unrealized gains	3	37
Ending balance	$ 4,987	$ 1,737	$ 6,777

Investment Debt Securities Avai

Investment Debt 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	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,856,026	$ 1,757,380
Gross Unrealized Gains	32,150	4,659
Gross Unrealized Losses	1,452	34,691
Available for sale debt securities, at fair value	1,886,724	1,727,348
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,742,221	1,623,906
Gross Unrealized Gains	26,403	3,792
Gross Unrealized Losses	1,382	33,423
Available for sale debt securities, at fair value	1,767,242	1,594,275
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	88,301	88,415
Gross Unrealized Gains	5,594	698
Gross Unrealized Losses	0	335
Available for sale debt securities, at fair value	93,895	88,778
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,504	6,265
Gross Unrealized Gains	153	162
Gross Unrealized Losses	0	0
Available for sale debt securities, at fair value	5,657	6,427
Obligations of U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,000	38,794
Gross Unrealized Gains	0	7
Gross Unrealized Losses	70	933
Available for sale debt securities, at fair value	$ 19,930	$ 37,868

Investment Debt Securities Av_2

Investment Debt Securities Available for Sale - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2019USD ($)Security	Dec. 31, 2018USD ($)Security	Dec. 31, 2017USD ($)
Schedule of Available-for-sale Securities [Line Items]
Gain (loss) on sale of collateralized loan obligation securities	$ (5,000)
Tax provisions related to net realized gains		$ 6,000	$ (6,000)	$ (3,000)
Securities estimated fair value	$ 1,195,664,000	$ 1,195,664,000	$ 961,721,000
Debt Securities, Held-to-maturity, Restricted [Extensible List]	us-gaap:CollateralPledgedMember	us-gaap:CollateralPledgedMember	us-gaap:CollateralPledgedMember
Securities to third party dealers	$ 361,127,000	$ 361,127,000
Number of securities representing specified criteria | Security		0	0
Percentage of AFS securities held by any one issuer as a percentage of shareholders' equity	10.00%	10.00%	10.00%
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 Debt Securities Av_3

Investment Debt Securities Available for Sale - Schedule of Sales of Available for Sale Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Proceeds	$ 227,152	$ 355,652	$ 312,692
Gross gains	1,132	68	740
Gross losses	$ 1,107	$ 90	$ 747

Investment Debt Securities Av_4

Investment Debt Securities Available for Sale - Fair Value and Amortized Cost of Investment Securities by Contractual Maturity (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Investments Debt And Equity Securities [Abstract]
Available for sale, Due in one year or less, Amortized Cost	$ 2,193
Available for sale, Due after one year through five years, Amortized Cost	3,973
Available for sale, Due after five years through ten years, Amortized Cost	35,206
Available for sale, Due after ten years through thirty years, Amortized Cost	72,433
Available for sale, Mortgage backed securities, Amortized Cost	1,742,221
Amortized Cost	1,856,026
Investment securities available for sale, Due in one year or less, Fair Value	2,216
Investment securities available for sale, Due after one year through five years, Fair Value	4,098
Investment securities available for sale, Due after five years through ten years, Fair Value	35,872
Investment securities available for sale, Due after ten years through thirty years, Fair Value	77,296
Investment securities available for sale, Mortgage backed securities, Fair Value	1,767,242
Fair value	$ 1,886,724

Investment Debt Securities Av_5

Investment Debt Securities Available for Sale - Investments Gross Unrealized Losses and Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 145,179	$ 698,058
Less than 12 months, Unrealized Losses	458	11,430
12 months or more, Fair Value	117,903	647,951
12 months or more, Unrealized Losses	994	23,261
Total, Fair Value	263,082	1,346,009
Total, Unrealized Losses	1,452	34,691
Obligations of U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	19,930	25,104
Less than 12 months, Unrealized Losses	70	332
12 months or more, Fair Value		9,398
12 months or more, Unrealized Losses		601
Total, Fair Value	19,930	34,502
Total, Unrealized Losses	70	933
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	125,249	647,923
Less than 12 months, Unrealized Losses	388	10,782
12 months or more, Fair Value	117,903	635,172
12 months or more, Unrealized Losses	994	22,641
Total, Fair Value	243,152	1,283,095
Total, Unrealized Losses	$ 1,382	33,423
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value		25,031
Less than 12 months, Unrealized Losses		316
12 months or more, Fair Value		3,381
12 months or more, Unrealized Losses		19
Total, Fair Value		28,412
Total, Unrealized Losses		$ 335

Investment Debt Securities Held

Investment Debt Securities Held to Maturity - Fair Value of Held to Maturity Securities and Related Gross Unrecognized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 202,903	$ 216,833
Gross Unrecognized Gains	5,978	799
Gross Unrecognized Losses	29	5,453
Held-to-maturity securities, fair value	208,852	212,179
Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	71,560	84,983
Gross Unrecognized Gains	456	0
Gross Unrecognized Losses	29	2,462
Held-to-maturity securities, fair value	71,987	82,521
Municipal Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	131,343	131,850
Gross Unrecognized Gains	5,522	799
Gross Unrecognized Losses		2,991
Held-to-maturity securities, fair value	$ 136,865	$ 129,658

Investment Debt Securities He_2

Investment Debt Securities Held to Maturity - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)Security	Dec. 31, 2018USD ($)Security
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity securities pledged, carrying amount | $	$ 100,582	$ 103,710
Debt securities, available-for-sale, restriction type [extensible list]	us-gaap:CollateralPledgedMember	us-gaap:CollateralPledgedMember
Number of securities representing specified criteria	0	0
Percentage of HTM securities held by any one issuer as a percentage of shareholders' equity	10.00%	10.00%
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	0
Percentage of mortgage-backed securities held from U.S. government-sponsored entities and agencies	100.00%

Investment Debt Securities He_3

Investment Debt Securities Held to Maturity - Fair Value and Amortized Cost of Investment Securities by Contractual Maturity (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Investments Debt And Equity Securities [Abstract]
Held-to-maturity, Due after five years through ten years, Fair Value	$ 2,064
Held-to-maturity, Due after ten years through thirty years, Fair Value	134,801
Held-to-maturity, Mortgage backed securities, Fair Value	71,987
Held-to- maturity, Fair Value	208,852
Held-to-maturity, Due after five years through ten years, Amortized Cost	2,031
Held-to-maturity, Due after ten years through thirty years, Amortized Cost	129,312
Held-to-maturity, Mortgage backed securities, Amortized Cost	71,560
Held-to-maturity, Amortized Cost	$ 202,903

Investment Debt Securities He_4

Investment Debt Securities Held to Maturity - Investments Gross Unrecognized Losses and Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value		$ 22,560
Less than 12 months, Unrecognized Losses		203
12 months or more, Fair Value	$ 8,445	130,328
12 months or more, Unrecognized Losses	29	5,250
Total, Fair Value	8,445	152,888
Total, Unrecognized Losses	29	5,453
Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
12 months or more, Fair Value	8,445	82,521
12 months or more, Unrecognized Losses	29	2,462
Total, Fair Value	8,445	82,521
Total, Unrecognized Losses	$ 29	2,462
Municipal Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value		22,560
Less than 12 months, Unrecognized Losses		203
12 months or more, Fair Value		47,807
12 months or more, Unrecognized Losses		2,788
Total, Fair Value		70,367
Total, Unrecognized Losses		$ 2,991

Loans Held for Sale - Additiona

Loans Held for Sale - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Receivables Held For Sale [Abstract]
Net gains from changes in estimated fair value of mortgage loans held for sale	$ 1,174,000	$ 1,081,000
Total unpaid principal balance of loans held for sale	141,627,000	39,318,000
Loans held for sale, past due	0	0
Loans held for sale, on non-accrual	$ 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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Receivables Held For Sale [Abstract]
Beginning balance	$ 40,399	$ 19,647
Effect from acquisitions	14,588	8,959
Loans originated	1,157,356	403,492	$ 93,642
Proceeds from sales	(1,100,207)	(403,583)	(77,791)
Net change in fair value	1,174	1,081
Net realized gain on sales	29,491	10,803	1,511
Ending balance	$ 142,801	$ 40,399	$ 19,647

Loans Held for Sale - Summary_2

Loans Held for Sale - Summary of Components of Mortgage Banking Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans Held For Sale [Line Items]
Servicing fees and commissions	$ 358	$ 196
Gain on sale of loans held for sale	29,491	10,803	$ 1,511
Net change in fair value	1,174	1,081
Net gain on mortgage derivatives	494	614
Loss on mortgage hedge	(1,731)	(46)
Loss on mortgage servicing assets	(233)	(38)
Mortgage Banking Income
Loans Held For Sale [Line Items]
Non interest income	$ 29,553	$ 12,610	$ 1,511

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] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans Held For Sale [Line Items]
Total derivative instruments	$ 368,547	$ 141,410
Interest Rate Lock Commitments [Member]
Loans Held For Sale [Line Items]
Total derivative instruments	125,409	49,545
Best Efforts Forward Trades [Member]
Loans Held For Sale [Line Items]
Total derivative instruments	123,638	61,865
MBS Forward Trades [Member]
Loans Held For Sale [Line Items]
Total derivative instruments	$ 119,500	$ 30,000

Loans - Summary of Information

Loans - Summary of Information Concerning Loan Portfolio by Collateral Types (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Receivables with Imputed Interest [Line Items]
Total loans excluding purchased credit impaired loans	$ 11,848,475	$ 8,181,533
Total PCI loans	135,468	158,971
Total loans	11,983,943	8,340,504
Allowance for loan losses for loans that are not PCI loans	(40,429)	(39,579)
Net Loans	11,943,288	8,300,734
Allowance for loan losses for loans that are not PCI loans [Member]
Receivables with Imputed Interest [Line Items]
Real estate loans, Residential	2,512,544	1,702,114
Real estate loans, Commercial	6,325,108	4,454,098
Land, development and construction	999,923	635,562
Total real estate	9,837,575	6,791,774
Consumer and other loans	247,307	203,686
Loans before unearned fees and deferred cost	11,843,956	8,178,840
Net unearned fees and costs	4,519	2,693
Allowance for loan losses on PCI loans [Member]
Receivables with Imputed Interest [Line Items]
Real estate loans, Residential	45,795	58,804
Real estate loans, Commercial	81,576	87,336
Land, development and construction	4,655	7,028
Total real estate	132,026	153,168
Consumer and other loans	100	209
Commercial and industrial	3,342	5,594
Allowance for loan losses for PCI loans	(226)	(191)
Commercial Industrial and Factored Receivables [Member] | Allowance for loan losses for loans that are not PCI loans [Member]
Receivables with Imputed Interest [Line Items]
Commercial, industrial & factored receivables	$ 1,759,074	$ 1,183,380

Loans - Summary of Allowance fo

Loans - Summary of Allowance for Loan Losses and Recorded Investment in Loans by Portfolios (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 39,770
Provision for loan losses	10,585	$ 8,283	$ 4,958
Balance at end of period	40,655	39,770
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	39,579	32,530	26,569
Charge-offs	(14,057)	(3,835)	(1,999)
Recoveries	4,357	2,432	2,759
Provision for loan losses	10,550	8,452	5,201
Balance at end of period	40,429	39,579	32,530
Allowance for loan losses on PCI loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	191	295	472
Charge-offs		(10)
Recoveries		75	66
Provision for loan losses	35	(169)	(243)
Balance at end of period	226	191	295
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	5,518
Balance at end of period	4,257	5,518
Residential Real Estate [Member] | 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	5,518	6,003	5,640
Charge-offs	(721)	(516)	(254)
Recoveries	710	1,027	950
Provision for loan losses	(1,250)	(996)	(333)
Balance at end of period	4,257	5,518	6,003
Residential Real Estate [Member] | Allowance for loan losses on PCI loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period			54
Provision for loan losses			(54)
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	22,978
Balance at end of period	18,552	22,978
Commercial Real Estate [Member] | 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	22,978	19,304	14,713
Charge-offs	(567)	(13)	(74)
Recoveries	1,057	679	662
Provision for loan losses	(4,916)	3,008	4,003
Balance at end of period	18,552	22,978	19,304
Commercial Real Estate [Member] | Allowance for loan losses on PCI loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		59	92
Recoveries			66
Provision for loan losses		(59)	(99)
Balance at end of period			59
Land, Development, Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	1,958
Balance at end of period	2,496	1,958
Land, Development, Construction [Member] | 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	1,781	1,179	883
Charge-offs	(42)	(126)
Recoveries	85	39	596
Provision for loan losses	495	689	(300)
Balance at end of period	2,319	1,781	1,179
Land, Development, Construction [Member] | Allowance for loan losses on PCI loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	177	222	312
Provision for loan losses		(45)	(90)
Balance at end of period	177	177	222
Commercial, Industrial and Factored Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	6,414
Balance at end of period	11,282	6,414
Commercial, Industrial and Factored Receivables [Member] | 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	6,414	4,130	3,785
Charge-offs	(9,545)	(1,474)	(677)
Recoveries	1,934	360	334
Provision for loan losses	12,479	3,398	688
Balance at end of period	11,282	6,414	4,130
Commercial, Industrial and Factored Receivables [Member] | Allowance for loan losses on PCI loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Charge-offs		(10)
Recoveries		75
Provision for loan losses		(65)
Consumer and Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	2,902
Balance at end of period	4,068	2,902
Consumer and Other [Member] | 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	2,888	1,914	1,548
Charge-offs	(3,182)	(1,706)	(994)
Recoveries	571	327	217
Provision for loan losses	3,742	2,353	1,143
Balance at end of period	4,019	2,888	1,914
Consumer and Other [Member] | Allowance for loan losses on PCI loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	14	14	14
Provision for loan losses	35
Balance at end of period	$ 49	$ 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	Dec. 31, 2019	Dec. 31, 2018
Allowance for loan losses:
Individually evaluated for impairment	$ 1,878	$ 1,616
Collectively evaluated for impairment	38,551	37,963
Purchased credit impaired	226	191
Total ending allowance balance	40,655	39,770
Loans:
Individually evaluated for impairment	26,140	15,700
Collectively evaluated for impairment	11,817,816	8,163,140
Purchased credit impaired	135,468	158,971
Total ending loan balances	11,979,424	8,337,811
Residential Real Estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	588	331
Collectively evaluated for impairment	3,669	5,187
Total ending allowance balance	4,257	5,518
Loans:
Individually evaluated for impairment	6,475	6,234
Collectively evaluated for impairment	2,506,069	1,695,880
Purchased credit impaired	45,795	58,804
Total ending loan balances	2,558,339	1,760,918
Commercial Real Estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	375	250
Collectively evaluated for impairment	18,177	22,728
Total ending allowance balance	18,552	22,978
Loans:
Individually evaluated for impairment	11,445	7,496
Collectively evaluated for impairment	6,313,663	4,446,602
Purchased credit impaired	81,576	87,336
Total ending loan balances	6,406,684	4,541,434
Land, Development, Construction [Member]
Allowance for loan losses:
Collectively evaluated for impairment	2,319	1,781
Purchased credit impaired	177	177
Total ending allowance balance	2,496	1,958
Loans:
Individually evaluated for impairment	865	117
Collectively evaluated for impairment	999,058	635,445
Purchased credit impaired	4,655	7,028
Total ending loan balances	1,004,578	642,590
Commercial, Industrial and Factored Receivables [Member]
Allowance for loan losses:
Individually evaluated for impairment	914	1,034
Collectively evaluated for impairment	10,368	5,380
Total ending allowance balance	11,282	6,414
Loans:
Individually evaluated for impairment	7,232	1,708
Collectively evaluated for impairment	1,751,842	1,181,672
Purchased credit impaired	3,342	5,594
Total ending loan balances	1,762,416	1,188,974
Consumer and Other [Member]
Allowance for loan losses:
Individually evaluated for impairment	1	1
Collectively evaluated for impairment	4,018	2,887
Purchased credit impaired	49	14
Total ending allowance balance	4,068	2,902
Loans:
Individually evaluated for impairment	123	145
Collectively evaluated for impairment	247,184	203,541
Purchased credit impaired	100	209
Total ending loan balances	$ 247,407	$ 203,895

Loans - Summary of Impaired Loa

Loans - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Mortgage Loans On Real Estate [Line Items]
Total TDRs (these are included in impaired loans)	$ 12,524	$ 9,477
Impaired loans that are not TDRs	13,616	6,223
Total impaired loans	26,140	15,700
Performing TDRs [Member]
Mortgage Loans On Real Estate [Line Items]
Total TDRs (these are included in impaired loans)	8,012	8,475
Non-performing TDRs [Member]
Mortgage Loans On Real Estate [Line Items]
Total TDRs (these are included in impaired loans)	$ 4,512	$ 1,002

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans [Line Items]
Loans modification, modified terms allowance period minimum	1 year
Loans modification, modified terms allowance period maximum	24 months
Troubled debt restructured loans total	$ 12,524
Performing TDRs (these are not included in nonperforming loans ("NPLs"))	8,012
Non-performing TDRs	4,512
Provision for loan loss expense	970	$ 77	$ 265
Partial charge offs for troubled debt restructured	$ 702	44	72
Percentage of troubled debt restructured current pursuant to modified terms	64.00%
Percentage of troubled debt restructured not performing pursuant to their modified terms	36.00%
Loans modified as TDRs	$ 5,228	1,830	2,258
Loan loss provision modified as TDRs	911	9	14
Provision for loan loss expense within twelve months	0	0	8
Partial charge offs for troubled debt restructured	0	0	8
Loan receivable modification, Specific reserve for customers	494	334
Allowances for loan losses	10,585	8,283	4,958
Reclassification from non-accretable difference	18,450	22,469	4,707
Income accretion	33,766
Allowance for loan losses on PCI loans [Member]
Loans [Line Items]
Allowances for loan losses	$ 35	$ (169)	$ (243)

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructured Loans by Loans Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
TDRs	$ 12,524	$ 9,477
Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	8,012	8,475
Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs	4,512	1,002
Total Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
TDRs	7,890	8,755
Total Real Estate Loans [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	6,743	7,762
Total Real Estate Loans [Member] | Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs	1,147	993
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs	6,009	6,234
Residential Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	4,862	5,848
Residential Real Estate [Member] | Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs	1,147	386
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs	1,706	2,403
Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	1,706	1,837
Commercial Real Estate [Member] | Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs		566
Land, Development, Construction [Member]
Financing Receivable, Modifications [Line Items]
TDRs	175	118
Land, Development, Construction [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	175	77
Land, Development, Construction [Member] | Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs		41
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
TDRs	4,511	577
Commercial and Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	1,146	577
Commercial and Industrial [Member] | Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs	3,365
Consumer and Other [Member]
Financing Receivable, Modifications [Line Items]
TDRs	123	145
Consumer and Other [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
TDRs	$ 123	136
Consumer and Other [Member] | Non Accrual [Member]
Financing Receivable, Modifications [Line Items]
TDRs		$ 9

Loans - Summary of Loans by Cla

Loans - Summary of Loans by Class Modified (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)SecurityLoan	Dec. 31, 2017USD ($)SecurityLoan
Mortgage Loans On Real Estate [Line Items]
Number of loans | SecurityLoan	2	1
Recorded investment | $	$ 482	$ 177
Commercial Real Estate [Member]
Mortgage Loans On Real Estate [Line Items]
Number of loans | SecurityLoan	1	1
Recorded investment | $	$ 433	$ 177
Land, Development, Construction [Member]
Mortgage Loans On Real Estate [Line Items]
Number of loans | SecurityLoan	1
Recorded investment | $	$ 49

Loans - Summary of Loans Indivi

Loans - Summary of Loans Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With an allowance recorded	$ 28,307	$ 16,593
Unpaid principal balance	28,307	16,593
Amount of allowance for loan losses allocated to impaired loans	1,878	1,616
Total impaired loans	26,140	15,700
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	2,894	3,608
Unpaid principal balance, With an allowance recorded	3,920	2,897
Amount of allowance for loan losses allocated to impaired loans	588	331
Recorded investment, With no related allowance	2,744	3,485
Recorded investment, With an allowance recorded	3,731	2,749
Total impaired loans	6,475	6,234
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	11,031	6,447
Unpaid principal balance, With an allowance recorded	1,438	1,593
Amount of allowance for loan losses allocated to impaired loans	375	250
Recorded investment, With no related allowance	10,015	5,906
Recorded investment, With an allowance recorded	1,430	1,590
Total impaired loans	11,445	7,496
Land, Development, Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	886	144
Recorded investment, With no related allowance	865	117
Total impaired loans	865	117
Commercial, Industrial and Factored Receivables [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	5,522	364
Unpaid principal balance, With an allowance recorded	2,486	1,378
Amount of allowance for loan losses allocated to impaired loans	914	1,034
Recorded investment, With no related allowance	4,820	353
Recorded investment, With an allowance recorded	2,412	1,355
Total impaired loans	7,232	1,708
Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	99	109
Unpaid principal balance, With an allowance recorded	31	53
Amount of allowance for loan losses allocated to impaired loans	1	1
Recorded investment, With no related allowance	98	108
Recorded investment, With an allowance recorded	25	37
Total impaired loans	$ 123	$ 145

Loans - Summary of Impairment b

Loans - Summary of Impairment by Class of Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	$ 21,361	$ 18,211	$ 19,327
Interest income recognized during impairment	410	461	469
Total Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	15,789	15,956	17,119
Interest income recognized during impairment	343	420	430
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	6,153	7,492	7,731
Interest income recognized during impairment	233	308	267
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	9,420	7,876	8,956
Interest income recognized during impairment	102	104	145
Land, Development, Construction [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	216	588	432
Interest income recognized during impairment	8	8	18
Commercial, Industrial and Factored Receivables [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	5,446	2,081	1,968
Interest income recognized during impairment	59	33	29
Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	126	174	240
Interest income recognized during impairment	$ 8	$ 8	$ 10

Loans - Summary of Recorded Inv

Loans - Summary of Recorded Investment in Non-accrual Loans and Loans Past Due Over 90 Days Still on Accrual by Class of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 36,916	$ 23,567
Loans past due over 90 days still accruing	1,692
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	13,455	11,488
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	12,141	8,445
Land, Development, Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,516	795
Commercial, Industrial and Factored Receivables [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	7,884	2,274
Loans past due over 90 days still accruing	1,692
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 920	$ 565

Loans - Summary of Aging of Rec

Loans - Summary of Aging of Recorded Investment in Past Due Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 11,843,956	$ 8,178,840
Total Past Due	59,003	36,502
Loans Not Past Due	11,748,037	8,118,771
Non accrual loans	36,916	23,567
30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	33,085	21,094
60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	24,226	15,408
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,512,544	1,702,114
Total Past Due	13,529	11,360
Loans Not Past Due	2,485,560	1,679,266
Non accrual loans	13,455	11,488
Residential Real Estate [Member] | 30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,601	5,730
Residential Real Estate [Member] | 60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,928	5,631
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	6,325,108	4,454,098
Total Past Due	10,131	15,446
Loans Not Past Due	6,302,836	4,430,207
Non accrual loans	12,141	8,445
Commercial Real Estate [Member] | 30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,554	10,840
Commercial Real Estate [Member] | 60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,577	4,607
Land, Development, Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	999,923	635,562
Total Past Due	3,692	4,683
Loans Not Past Due	993,715	630,084
Non accrual loans	2,516	795
Land, Development, Construction [Member] | 30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,343	661
Land, Development, Construction [Member] | 60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,349	4,022
Commercial, Industrial and Factored Receivables [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,759,074	1,183,380
Total Past Due	29,081	3,681
Loans Not Past Due	1,722,109	1,177,425
Non accrual loans	7,884	2,274
Commercial, Industrial and Factored Receivables [Member] | 30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,924	2,803
Commercial, Industrial and Factored Receivables [Member] | 60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12,465	878
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	247,307	203,686
Total Past Due	2,570	1,332
Loans Not Past Due	243,817	201,789
Non accrual loans	920	565
Consumer and Other [Member] | 30 - 59 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,663	1,061
Consumer and Other [Member] | 60 - 89 days past due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 907	$ 271

Loans - Risk Category of Loans

Loans - Risk Category of Loans by Class of Loans, Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 2,512,544	$ 1,702,114
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	247,307	203,686
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	11,548,688	7,831,100
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,455,752	1,633,810
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	6,151,309	4,246,687
Pass [Member] | Land, Development, Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	989,860	610,631
Pass [Member] | Commercial, Industrial and Factored Receivables [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,705,862	1,137,272
Pass [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	245,905	202,701
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	191,249	264,172
Special Mention [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	31,189	41,522
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	118,412	160,981
Special Mention [Member] | Land, Development, Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	6,418	20,586
Special Mention [Member] | Commercial, Industrial and Factored Receivables [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	35,070	40,836
Special Mention [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	160	247
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	104,019	83,568
Substandard [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	25,603	26,782
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	55,387	46,430
Substandard [Member] | Land, Development, Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,645	4,345
Substandard [Member] | Commercial, Industrial and Factored Receivables [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	18,142	5,272
Substandard [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,242	$ 738

Loans - Investment in Residenti

Loans - Investment in Residential and Consumer Loans, Excluding Loans from Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 2,512,544	$ 1,702,114
Residential Real Estate [Member] | Performing TDRs [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,499,089	1,690,626
Residential Real Estate [Member] | Non-performing TDRs [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	13,455	11,488
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	247,307	203,686
Consumer and Other [Member] | Performing TDRs [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	246,387	203,121
Consumer and Other [Member] | Non-performing TDRs [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 920	$ 565

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	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Contractually required principal and interest	$ 244,189	$ 267,815	$ 248,283
Non-accretable difference	(46,271)	(38,602)	(13,183)
Cash flows expected to be collected	197,918	229,213	235,100
Accretable yield	(62,450)	(70,242)	(70,942)
Purchased credit impaired loans	135,468	158,971	164,158
Allowance for loan losses	(226)	(191)	(295)
Carrying value less allowance for loan losses	$ 135,242	$ 158,780	$ 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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Contractually required principal and interest, beginning balance	$ 267,815	$ 248,283
Non-accretable difference, beginning balance	(38,602)	(13,183)
Cash flows expected to be collected, beginning balance	229,213	235,100
Accretable yield, beginning balance	(70,242)	(70,942)
Carrying value of acquired loans, beginning balance	158,971	164,158
Income accretion	33,766
Contractually required principal and interest, ending balance	244,189	267,815	$ 248,283
Non-accretable difference, ending balance	(46,271)	(38,602)	(13,183)
Cash flows expected to be collected, ending balance	197,918	229,213	235,100
Accretable yield, ending balance	(62,450)	(70,242)	(70,942)
Carrying value of acquired loans, ending balance	135,468	158,971	164,158
Contractually Required Principal and Interest [Member]
Financing Receivable, Recorded Investment [Line Items]
Contractually required principal and interest, beginning balance	267,815	248,283	297,821
Effect of acquisitions	51,527	122,392	31,334
All other adjustments	(75,153)	(102,860)	(80,872)
Contractually required principal and interest, ending balance	244,189	267,815	248,283
Non-Accretable Difference [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-accretable difference, beginning balance	(38,602)	(13,183)	(18,372)
Effect of acquisitions	(29,187)	(58,927)	(7,104)
All other adjustments	21,518	33,508	12,293
Non-accretable difference, ending balance	(46,271)	(38,602)	(13,183)
Cash Flows Expected to be Collected [Member]
Financing Receivable, Recorded Investment [Line Items]
Cash flows expected to be collected, beginning balance	229,213	235,100	279,449
Effect of acquisitions	22,340	63,465	24,230
All other adjustments	(53,635)	(69,352)	(68,579)
Cash flows expected to be collected, ending balance	197,918	229,213	235,100
Accretable Yield [Member]
Financing Receivable, Recorded Investment [Line Items]
Accretable yield, beginning balance	(70,242)	(70,942)	(93,525)
Effect of acquisitions	(3,724)	(7,770)	(4,185)
Income accretion	33,766	35,944	32,388
All other adjustments	(22,250)	(27,474)	(5,620)
Accretable yield, ending balance	(62,450)	(70,242)	(70,942)
Carry Value of Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Carrying value of acquired loans, beginning balance	158,971	164,158	185,924
Effect of acquisitions	18,616	55,695	20,045
Income accretion	33,766	35,944	32,388
All other adjustments	(75,885)	(96,826)	(74,199)
Carrying value of acquired loans, ending balance	$ 135,468	$ 158,971	$ 164,158

Other Real Estate Owned - Activ

Other Real Estate Owned - Activity of Valuation Allowance in Other Real Estate Owned and Expense Related to Foreclosed Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Abstract]
Beginning of year	$ 404	$ 861	$ 869
Valuation write down of OREO	395	482	682
Sales and/or dispositions	(284)	(939)	(690)
End of year	515	404	861
Expenses related to foreclosed real estate include:
Gain on sale of repossessed real estate owned	(428)	(1,933)	(876)
Valuation write down of OREO	395	482	682
Operating expenses, net of rental income	3,221	2,815	2,252
Total	$ 3,188	$ 1,364	$ 2,058

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans with allocated allowance for loan losses	$ 18,556	$ 8,829
Impaired valuation allowance	1,708	1,463
Provision for loan loss expense on impaired loans	10,585	8,283	$ 4,958
Repossessed real estate owned valuation write down	395	482	682
Impairment on bank property held for sale	1,736	2,667	$ 519
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Provision for loan loss expense on impaired loans	$ 2,739	$ 1,363
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Capitalization rates to determine fair value of collateral	8.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Capitalization rates to determine fair value of collateral	13.00%

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Trading securities, at fair value	$ 4,987	$ 1,737
Available for sale debt securities	1,886,724	1,727,348
Loans held for sale	142,801	40,399
Mortgage servicing assets, carrying amount	1,332	1,565
Mortgage banking derivatives, carrying amount assets	1,761	783
Liabilities:
Mortgage banking derivatives, carrying amount liability	305	169
Mortgage Backed Securities [Member]
Assets:
Available for sale debt securities	1,767,242	1,594,275
Municipal Securities [Member]
Assets:
Available for sale debt securities	93,895	88,778
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Trading securities, at fair value	4,987	1,737
Available for sale debt securities	1,886,724	1,727,348
Fair Value Measurements on Recurring [Member] | Carrying value [Member]
Assets:
Trading securities, at fair value	4,987	1,737
Loans held for sale	142,801	40,399
Mortgage servicing assets, carrying amount	1,332	1,565
Mortgage banking derivatives, carrying amount assets	1,761	783
Interest rate swap derivatives, carrying amount assets	273,068	92,475
Liabilities:
Mortgage banking derivatives, carrying amount liability	305	169
Interest rate swap derivatives, carrying amount liability	275,033	92,892
Fair Value Measurements on Recurring [Member] | Carrying value [Member] | Corporate Debt Securities [Member]
Assets:
Available for sale debt securities	5,657	6,427
Fair Value Measurements on Recurring [Member] | Carrying value [Member] | Obligations of U.S. Government Sponsored Entities and Agencies [Member]
Assets:
Available for sale debt securities	19,930	37,868
Fair Value Measurements on Recurring [Member] | Carrying value [Member] | Mortgage Backed Securities [Member]
Assets:
Available for sale debt securities	1,767,242	1,594,275
Fair Value Measurements on Recurring [Member] | Carrying value [Member] | Municipal Securities [Member]
Assets:
Available for sale debt securities	93,895	88,778
Fair Value Measurements on Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Trading securities, at fair value	4,987	1,737
Loans held for sale	142,801	40,399
Mortgage servicing assets, carrying amount	1,332	1,565
Mortgage banking derivatives, carrying amount assets	14
Interest rate swap derivatives, carrying amount assets	273,068	92,475
Liabilities:
Mortgage banking derivatives, carrying amount liability	288	164
Interest rate swap derivatives, carrying amount liability	275,033	92,892
Fair Value Measurements on Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]
Assets:
Available for sale debt securities	5,657	6,427
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 debt securities	19,930	37,868
Fair Value Measurements on Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage Backed Securities [Member]
Assets:
Available for sale debt securities	1,767,242	1,594,275
Fair Value Measurements on Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Municipal Securities [Member]
Assets:
Available for sale debt securities	93,895	88,778
Fair Value Measurements on Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Mortgage banking derivatives, carrying amount assets	1,747	783
Liabilities:
Mortgage banking derivatives, carrying amount liability	$ 17	$ 5

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	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans on Residential real estate at Carrying value	$ 2,213	$ 1,811
Impaired loans on Commercial real estate at Carrying value	8,177	5,614
Impaired loans on Land, land development and construction at Carrying value	847	90
Impaired loans on Commercial at Carrying value	5,564	1,274
Impaired loans on Consumer at Carrying value	47	40
Other real estate owned on Commercial real estate at Carrying value	2,129
Other real estate owned on Land, land development and construction at Carrying value	340	867
Bank owned real estate held for sale	4,160	5,805
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans on Residential real estate	2,213	1,811
Impaired loans on Commercial real estate	8,177	5,614
Impaired loans on Land, land development and construction	847	90
Impaired loans on Commercial	5,564	1,274
Impaired loans on Consumer	47	40
Other real estate owned on Land, land development and construction	340	867
Bank owned real estate held for sale	4,160	$ 5,805
Other real estate owned on Commercial real estate	$ 2,129

Fair Value - Carrying Amounts a

Fair Value - Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial assets:
Cash and cash equivalents	$ 490,058	$ 367,333
Cash and cash equivalents, fair value	490,058	367,333
Trading securities, at fair value	4,987	1,737
Available for sale debt securities, at fair value	1,886,724	1,727,348
Held to maturity debt securities, carrying amount	202,903	216,833
Held to maturity debt securities, at fair value	208,852	212,179
Loans held for sale, carrying value	142,801	40,399
Loans held for sale, fair value	142,801	40,399	$ 19,647
Loans, net, carrying amount	11,943,288	8,300,734
Loans, net, fair value	11,925,693	8,342,220
Mortgage servicing assets, carrying amount	1,332	1,565
Mortgage servicing assets, at fair value	1,332	1,565
Mortgage banking derivatives, carrying amount assets	1,761	783
Mortgage banking derivatives, assets fair value	1,761	783
Interest rate swap derivatives, carrying amount assets	273,068	92,475
Interest rate swap derivatives, assets fair value	273,068	92,475
Accrued interest receivable, carrying amount	40,945	33,143
Accrued interest receivable, fair value	40,945	33,143
Financial liabilities:
Deposits- without stated maturities, carrying amount	10,879,837	7,655,376
Deposits- without stated maturities, fair value	10,879,837	7,655,376
Deposits- with stated maturities, carrying amount	2,256,555	1,821,960
Deposits- with stated maturities, fair value	2,271,497	1,827,299
Securities sold under agreement to repurchase, fair value	93,141	57,772
Securities sold under agreement to repurchase	93,141	57,772
Federal funds purchased and other borrowings, carrying amount	540,193	655,360
Federal funds purchased and other borrowings, fair value	540,193	655,360
Mortgage banking derivatives, carrying amount liability	305	169
Mortgage banking derivatives, liability fair value	305	169
Interest rate swap derivatives, carrying amount	275,033	92,892
Interest rate swap derivatives, fair value	275,033	92,892
Accrued interest payable, carrying amount	3,998	2,627
Accrued interest payable, fair value	3,998	2,627
Subordinated and corporate debentures, fair value	66,964	28,621
Interest rate swap derivatives, fair value	275,033	92,892
Subordinated and corporate debentures, carrying amount	71,343	32,415
Corporate and subordinated debentures	71,343	32,415
Mortgage banking derivatives, carrying amount liability	305	169
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents, fair value	490,058	367,333
Financial liabilities:
Deposits- without stated maturities, fair value	10,879,837	7,655,376
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Trading securities, at fair value	4,987	1,737
Available for sale debt securities, at fair value	1,886,724	1,727,348
Held to maturity debt securities, at fair value	208,852	212,179
Loans held for sale, fair value	142,801	40,399
Mortgage servicing assets, at fair value	1,332	1,565
Mortgage banking derivatives, assets fair value	14
Interest rate swap derivatives, assets fair value	273,068	92,475
Accrued interest receivable, fair value	7,547	8,355
Financial liabilities:
Deposits- with stated maturities, fair value	2,271,497	1,827,299
Securities sold under agreement to repurchase, fair value	93,141	57,772
Federal funds purchased and other borrowings, fair value	540,193	655,360
Mortgage banking derivatives, liability fair value	288	164
Accrued interest payable, fair value	3,998	2,627
Interest rate swap derivatives, fair value	275,033	92,892
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Loans, net, fair value	11,925,693	8,342,220
Mortgage banking derivatives, assets fair value	1,747	783
Accrued interest receivable, fair value	33,398	24,788
Financial liabilities:
Mortgage banking derivatives, liability fair value	17	5
Subordinated and corporate debentures, fair value	$ 66,964	$ 28,621

Bank Premises and Equipment - S

Bank Premises and Equipment - Summary of Bank Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	$ 363,922	$ 278,494
Less: accumulated depreciation	67,216	51,040
Bank premises and equipment, Net	296,706	227,454
Land [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	89,973	72,487
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	1,560	1,381
Buildings [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	174,344	130,424
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	19,076	13,655
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	68,148	45,056
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	$ 10,821	$ 15,491

Bank Premises and Equipment - A

Bank Premises and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Rental expense, net	$ 7,307	$ 5,642	$ 2,996
Annual rental income	$ 1,792	$ 1,183	$ 930

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Change in Balance for Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning of year	$ 802,880	$ 257,683	$ 106,028
Acquired goodwill	401,537	545,197	151,655
Impairment	0	0	0
End of year	$ 1,204,417	$ 802,880	$ 257,683

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Additional Information (Detail)	Sep. 01, 2018USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Apr. 01, 2019USD ($)	Dec. 31, 2017USD ($)
Finite Lived Intangible Assets [Line Items]
Amortized period on accelerated basis		10 years
Acquired total servicing assets	$ 1,828,000
Impairment charges	0
Servicing assets fair value		$ 3,175,000	$ 1,388,000		$ 551,000
SBA [Member]
Finite Lived Intangible Assets [Line Items]
Impairment charges	$ 0
Loans serviced for others			226,000,000
Loans sold with servicing assets retained		52,705,000,000	35,779,000,000
Amortization of servicing assets		1,062,000	235,000
Servicing assets fair value		$ 3,175,000	$ 1,388,000
Weighted Average Default Rate [Member]
Finite Lived Intangible Assets [Line Items]
Servicing asset input rate		0.006
Minimum [Member] | Discount Rate [Member]
Finite Lived Intangible Assets [Line Items]
Servicing asset input rate		0.004
Minimum [Member] | Prepayment Speed Rate [Member]
Finite Lived Intangible Assets [Line Items]
Servicing asset input rate		0.067
Maximum [Member] | Discount Rate [Member]
Finite Lived Intangible Assets [Line Items]
Servicing asset input rate		0.011
Maximum [Member] | Prepayment Speed Rate [Member]
Finite Lived Intangible Assets [Line Items]
Servicing asset input rate		0.131
National Commerce Corporation [Member]
Finite Lived Intangible Assets [Line Items]
Acquired total servicing assets				$ 1,581,000
National Commerce Corporation [Member] | SBA [Member]
Finite Lived Intangible Assets [Line Items]
Loans serviced for others		$ 1,581,000,000

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Acquired Intangible Assets for Core Deposit Intangibles and Trust Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Beginning of year	$ 66,225	$ 24,063	$ 16,209
Disposal of Trust intangible asset	0	0	(573)
End of year	91,157	66,225	24,063
Core Deposits [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired	39,900	51,945	12,424
Core Deposits Intangible And Trust Intangible [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ (14,968)	$ (9,783)	$ (3,997)

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Schedule of Core Deposit Intangibles Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amortized intangible assets:
Accumulated Amortization	$ 42,707	$ 27,739
Gross Carrying Amount	133,864	93,964
Core Deposit Intangibles [Member]
Amortized intangible assets:
Accumulated Amortization	42,707	27,739
Gross Carrying Amount	$ 133,864	$ 93,964

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets - Estimated Amortization Expense (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
2020	$ 14,423
2021	12,438
2022	11,083
2023	10,688
2024	$ 9,928

Goodwill and Intangible Asset_7

Goodwill and Intangible Assets - Schedule of Activity for MSA and the Related Valuation Allowance (Detail) - Mortgage Servicing Asset [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Beginning of year	$ 1,565
Effect from acquisitions		$ 1,602
Changes in fair value	(233)	(37)
End of year	$ 1,332	$ 1,565

Goodwill and Intangible Asset_8

Goodwill and Intangible Assets - Schedule of Activity for SBA Servicing Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning of year	$ 1,388	$ 551
Additions	1,268	846
Effect from acquisitions	1,581	226
Amortized to expense	(1,062)	(235)
End of year	$ 3,175	$ 1,388

Deposits - Summary of Deposits

Deposits - Summary of Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Banking And Thrift [Abstract]
Non-interest bearing deposits	$ 3,929,183	$ 2,923,640
Interest bearing deposits:
Interest bearing demand deposits	2,613,933	1,811,006
Savings deposits	811,150	704,159
Money market accounts	3,525,571	2,216,571
Time deposits less than $100,000	966,040	871,043
Time deposits of $100,000 or greater	1,290,515	950,917
Total deposits	$ 13,136,392	$ 9,477,336
Interest bearing demand deposits, Weighted Average Interest Rate	0.40%	0.30%
Savings deposits, Weighted Average Interest Rate	0.30%	0.10%
Money market accounts, Weighted Average Interest Rate	1.00%	0.90%
Time deposits less than $100, Weighted Average Interest Rate	1.70%	1.60%
Time deposits of $100 or greater, Weighted Average Interest Rate	1.90%	1.60%
Total deposits, Weighted Average Interest Rate	0.70%	0.60%

Deposits - Summary of Certifica

Deposits - Summary of Certificate Accounts (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Banking And Thrift [Abstract]
2020	$ 1,896,281
2021	216,494
2022	64,737
2023	46,607
2024	31,559
Thereafter	877
Total	$ 2,256,555	$ 1,821,960

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Brokered Deposits	$ 323,392	$ 328,718
FDIC [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Time deposits of $250 thousands or greater	$ 647,490	$ 397,369

Securities Sold Under Agreeme_3

Securities Sold Under Agreements to Repurchase - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Banking And Thrift [Abstract]
Securities sold under agreement to repurchase	$ 93,141	$ 57,772
Collateral pledged against repurchase agreement	$ 131,394	$ 64,706

Securities Sold Under Agreeme_4

Securities Sold Under Agreements to Repurchase - Summary of Repurchase Agreement (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets Sold Under Agreements To Repurchase [Line Items]
Market value of securities pledged	$ 131,394	$ 64,706
Securities sold under agreement to repurchase	$ 93,141	$ 57,772
Market value pledged as a % of borrowings	141.00%	112.00%
Average daily balance during the year	$ 73,314	$ 54,344	$ 43,850
Average interest rate during the year	1.51%	1.16%	0.56%
Maximum month-end balance during the year	$ 93,141	$ 59,751	$ 52,080
Weighted average interest rate at year end	1.30%	1.66%	0.88%
Mortgage Backed Securities [Member]
Assets Sold Under Agreements To Repurchase [Line Items]
Market value of securities pledged	$ 130,942	$ 64,269
Securities sold under agreement to repurchase	$ 92,953	$ 57,594
Market value pledged as a % of borrowings	141.00%	112.00%
Municipal Securities [Member]
Assets Sold Under Agreements To Repurchase [Line Items]
Market value of securities pledged	$ 451	$ 437
Securities sold under agreement to repurchase	$ 188	$ 178
Market value pledged as a % of borrowings	240.00%	246.00%

Federal Funds Purchased - Feder

Federal Funds Purchased - Federal Funds Purchased Overnight Deposits from Correspondent Banks (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Banking And Thrift [Abstract]
Average daily balance during the year	$ 286,179	$ 250,499
Average interest rate during the period	2.29%	2.02%
Maximum month-end balance during the year	$ 379,193	$ 294,360
Weighted average interest rate at year end	1.68%	2.07%

Federal Home Loan Bank Advanc_3

Federal Home Loan Bank Advances and Other Borrowed Funds - Summary of Advances from Federal Home Loan Bank (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Banking And Thrift [Abstract]
Fixed rate advances, maturity through 01/28/2019, rates from 2.45% and 2.54%, averaging 2.50%		$ 200,000
Floating rate advances, rates of 1.87% and 2.65%,as of December 31, 2019 and 2018, respectively	$ 150,000	150,000
Total	$ 150,000	$ 350,000

Federal Home Loan Bank Advanc_4

Federal Home Loan Bank Advances and Other Borrowed Funds - Summary of advances from the Federal Home Loan Bank (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Average fixed rate advances from FHLB	2.50%
Fixed rate advances maturity date for FHLB	Jan. 28, 2019
Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Fixed rate advances from FHLB	2.45%
Floating rate advances from FHLB	1.87%	1.87%
Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Fixed rate advances from FHLB	2.54%
Floating rate advances from FHLB	2.65%	2.65%

Federal Home Loan Bank Advanc_5

Federal Home Loan Bank Advances and Other Borrowed Funds - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank advances, maximum eligible amount under collateralized transaction		$ 610,457,000
Federal home advances		$ 150,000,000	$ 350,000,000
Debt instrument, maturity date		Apr. 1, 2021
Debt instrument interest description		LIBOR plus 350 basis points
Sunshine Company [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Debt Instrument Term	5 years
Debt instrument, maturity date	Apr. 1, 2021
Debt Instrument subscription percentage	100.00%
Debt Instrument, Face Amount	$ 11,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Revolving Line of Credit [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Line of Credit		$ 0	$ 0
Line of credit available		$ 50,000,000
Revolving Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Debt instrument variable interst rate		3.50%
Letter of Credit [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Debt Instrument Term		1 year
Debt instrument, maturity date		Jun. 18, 2020
Letter of Credit [Member] | Alabama SAFE Program [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home advances		$ 160,400,000

Corporate and Subordinated De_2

Corporate and Subordinated Debentures - Additional Information (Detail) - USD ($)

Jun. 30, 2022

Jun. 01, 2021

May 19, 2016

Mar. 16, 2016

Dec. 28, 2006

Jul. 17, 2006

Sep. 08, 2004

Sep. 22, 2003

Sep. 17, 2003

Dec. 31, 2018

Sep. 30, 2018

Jan. 31, 2018

Nov. 30, 2011

Jun. 30, 2019

Dec. 31, 2019

Dec. 31, 2017

Nov. 01, 2011

Corporate And Subordinated Debentures [Line Items]

Debt instrument interest description

LIBOR plus 350 basis points

Corporate debenture lives

30 years

Corporate debenture callable, Call option period

5 years

Debt instrument maturity year

2033

Debt instrument, maturity date

Apr. 1, 2021

Assets

$ 15,000,000,000

NCOM [Member]

Corporate And Subordinated Debentures [Line Items]

Fixed to floating rate

6.00%

Debt instrument, maturity date

Jun. 1, 2026

Debt Instrument, Interest Rate, Stated Percentage

6.00%

NCOM [Member] | Underwritten Public Offering [Member]

Corporate And Subordinated Debentures [Line Items]

Unsecured Debt

$ 25,000,000

NCOM [Member] | Scenario Forecast [Member]

Corporate And Subordinated Debentures [Line Items]

Debt instrument interest description

LIBOR plus 467 basis points

LIBOR plus 479 basis points

Unsecured Debt

$ 13,000,000

Fixed to floating rate

6.50%

Debt instrument, maturity date

Jun. 30, 2027

Debt Instrument, Interest Rate, Stated Percentage

6.50%

NCOM [Member] | Scenario Forecast [Member] | London Interbank Offered Rate (LIBOR) [Member]

Corporate And Subordinated Debentures [Line Items]

Debt instrument variable interst rate

4.67%

4.79%

Valrico Bancorp [Member]

Corporate And Subordinated Debentures [Line Items]

Floating rate corporate debenture issued, amount

$ 2,500,000

Debt instrument interest description

three month LIBOR plus 270 bps

Corporate debenture, basis spread on LIBOR rate

2.70%

Corporate debenture lives

30 years

Corporate debenture callable, Call option period

5 years

Trust [Member]

Corporate And Subordinated Debentures [Line Items]

Floating rate corporate debenture issued, amount

$ 10,000,000

Trust preferred securities, basis spread on LIBOR rate

3.05%

Debt instrument interest description

three month LIBOR plus 305 basis points

Trust preferred security lives

30 years

Trust preferred securities callable, call option period

5 years

Investment in the common stock of the trust

$ 310,000

Corporate debenture, basis spread on LIBOR rate

3.05%

Valrico Trust [Member] | Valrico Bancorp [Member]

Corporate And Subordinated Debentures [Line Items]

Trust preferred securities, basis spread on LIBOR rate

2.70%

Trust preferred security lives

30 years

Trust preferred securities callable, call option period

5 years

Investment in the common stock of the trust

$ 77,000

Federal Trust Statutory I [Member]

Corporate And Subordinated Debentures [Line Items]

Floating rate corporate debenture issued, amount

$ 5,000,000

Trust preferred securities, basis spread on LIBOR rate

2.95%

Debt instrument interest description

three month LIBOR plus 295 bps

Trust preferred security lives

30 years

Trust preferred securities callable, call option period

5 years

Investment in the common stock of the trust

$ 155,000

Corporate debenture, basis spread on LIBOR rate

2.95%

Corporate debenture lives

30 years

Corporate debenture callable, Call option period

5 years

Gulfstream Bancshares Capital Trust II [Member]

Corporate And Subordinated Debentures [Line Items]

Floating rate corporate debenture issued, amount

$ 3,000,000

Trust preferred securities, basis spread on LIBOR rate

1.70%

Debt instrument interest description

three month LIBOR plus 170 bps

Trust preferred security lives

30 years

Corporate debenture, basis spread on LIBOR rate

1.70%

Corporate debenture lives

30 years

Homestead Statutory Trust I [Member]

Corporate And Subordinated Debentures [Line Items]

Floating rate corporate debenture issued, amount

$ 16,000,000

Trust preferred securities, basis spread on LIBOR rate

1.65%

Debt instrument interest description

three month LIBOR plus 165 bps

Trust preferred security lives

30 years

Corporate debenture, basis spread on LIBOR rate

1.65%

Corporate debenture lives

30 years

Partial redemption of long term debt

$ 6,000,000

BSA Financial Statutory Trust I [Member]

Corporate And Subordinated Debentures [Line Items]

Floating rate corporate debenture issued, amount

$ 5,000,000

Trust preferred securities, basis spread on LIBOR rate

1.55%

Debt instrument interest description

three month LIBOR plus 155 bps

Trust preferred security lives

30 years

Investment in the common stock of the trust

$ 155,000

MRCB Statutory Trust II [Member]

Corporate And Subordinated Debentures [Line Items]

Floating rate corporate debenture issued, amount

$ 3,000,000

Trust preferred securities, basis spread on LIBOR rate

1.60%

Debt instrument interest description

three month LIBOR plus 160 bps

Trust preferred security lives

30 years

Investment in the common stock of the trust

$ 93,000

C B S Financial Capital Trust I

Corporate And Subordinated Debentures [Line Items]

Acquisition price

$ 4,000,000

Gains (Losses) on Extinguishment of Debt, Total

$ 0

CBS Financial Capital Trust II [Member]

Corporate And Subordinated Debentures [Line Items]

Acquisition price

$ 5,000,000

Gains (Losses) on Extinguishment of Debt, Total

$ 0

Income Taxes - Allocation of Fe

Income Taxes - Allocation of Federal and State Income Tax Expense (Benefit) Between Current and Deferred Portions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current, Federal Tax Expense	$ 34,182	$ 14,273	$ 18,243
Current, State Tax Expense	9,275	5,240	4,045
Current, Total	43,457	19,513	22,288
Deferred, Federal Tax Expense	18,510	16,843	29,393
Deferred, State Tax Expense	5,731	4,668	1,799
Deferred, Total	24,241	21,511	31,192
Federal, Total	52,692	31,116	47,636
State, Total	15,006	9,908	5,844
Total	$ 67,698	$ 41,024	$ 53,480

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for loan losses	$ 10,178	$ 10,079
Stock based compensation	2,242	1,701
Deferred compensation	2,782	2,235
Impairment expenses	2,222	1,334
Net operating loss carryforward	19,812	18,313
Other real estate owned expenses	129	177
Fair value adjustments	6,979	17,929
Nonaccrual interest	2,996	2,890
Unrealized loss on interest rate swap	205
Unrealized loss on available for sale debt securities		7,611
Other	973
Total deferred tax assets	48,518	62,269
Deferred tax liabilities:
Premises and equipment, due to differences in depreciation methods and useful lives	(8,702)	(8,145)
Deferred loan costs, net	(1,131)	(683)
Like kind exchange		(197)
Accretion of discounts on investments		(67)
Total deferred tax liabilities	(19,732)	(10,807)
Unrealized gain on available for sale debt securities	(7,685)
Investment in pass-through entity	(184)
Prepaid expenses	(2,030)	(1,608)
Other		(107)
Net deferred tax asset	$ 28,786	$ 51,462

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 01, 2019	Mar. 01, 2016	Jun. 01, 2014
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		$ 54,882
Net operating loss total		79,204
Operating loss carryforwards, valuation allowance		$ 24,322
Operating loss carryforward period	20 years
Revaluation of deferred tax asset due to change in federal income tax rate				$ 18,575
U.S. federal corporate rate		21.00%	35.00%	35.00%
Florida and Georgia [Member]
Operating Loss Carryforwards [Line Items]
Revaluation of deferred tax asset due to change in state income tax rate		$ 987
First Southern Bank Inc [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards							$ 57,375
Per year tax credit carryforwards							$ 6,487
Community Bank of South Florida, Inc. [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards						$ 11,526
Per year tax credit carryforwards						1,722
Hometown of Homestead Banking Company [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards						8,763
Per year tax credit carryforwards						$ 507
Sunshine Company [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 22,529
Per year tax credit carryforwards	3,682
HCBF Holding Company, Inc. [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	14,003
Per year tax credit carryforwards	$ 1,101
Charter Financial Corporation [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards					$ 35,712

Income Taxes - Summary of Net O

Income Taxes - Summary of Net Operating Loss Carryforwards (Details) $ in Thousands	Dec. 31, 2019USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 54,882
2027 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,318
2028 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	4,794
2029 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	7,060
2030 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	11,960
2031 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	5,524
2032 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	6,841
2033 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	13,350
2035 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	759
2036 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 3,276

Income Taxes - Reconciliation B

Income Taxes - Reconciliation Between the Actual Tax Expense and the Expected Tax (Benefit) Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
“Expected” tax expense	$ 61,550	$ 41,466	$ 38,246
Tax exempt interest, net	(3,661)	(3,177)	(4,104)
Bank owned life insurance	(1,834)	(1,167)	(1,251)
State income taxes, net of federal income tax benefits	11,855	7,827	4,077
Stock based compensation	4	17	40
Merger and acquisition related expenses	348	610	1,049
Excess tax benefit from stock based compensation	(838)	(5,095)	(3,007)
Revaluation of net deferred tax asset due to change in federal income tax rate			18,575
Other, net	274	543	(145)
Total	$ 67,698	$ 41,024	$ 53,480

Related-Party Transactions - Su

Related-Party Transactions - Summary Loans to Principal Officers, Directors and Their Affiliates (Detail) - Principal Officers, Directors and Their Affiliates [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Beginning balance	$ 48,426	$ 30,458
New loans and advances on existing loans	1,605	39,183
Repayments	(4,020)	(21,215)
Ending balance	$ 46,011	$ 48,426

Related-Party Transactions - Ad

Related-Party Transactions - Additional Information (Detail) - Principal Officers, Directors and Their Affiliates [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Line of credit available for principal officers, directors, and their affiliates	$ 12,812	$ 10,820
Deposits from principal officers, directors, and their affiliates	$ 16,198	$ 6,739

Regulatory Capital Matters - Ad

Regulatory Capital Matters - Additional Information (Detail)	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Jan. 02, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier 1 capital (to risk weighted assets), Ratio	11.30%		11.90%
Tier 1 capital (to risk weighted assets), Ratio	11.30%		12.30%
Total capital (to risk weighted assets), Ratio	12.20%		12.70%
Tier 1 capital (to average assets), Ratio	9.70%		10.00%
Capital conservation buffer rate		2.50%		1.875%
Effective fully implemented, common equity Tier 1 capital ratio	7.00%
Effective fully implemented, total Tier 1 capital ratio	8.50%
Effective fully implemented, total risk-based capital ratio	10.50%
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier 1 capital (to risk weighted assets), Ratio	4.50%
Tier 1 capital (to risk weighted assets), Ratio	6.00%
Total capital (to risk weighted assets), Ratio	8.00%
Tier 1 capital (to average assets), Ratio	4.00%
Maximum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer rate	2.50%

Regulatory Capital Matters - Su

Regulatory Capital Matters - Summary of Actual, Required, and Capital Levels Necessary for Capital Adequacy Purposes (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets), Amount	$ 1,672,911	$ 1,183,229
Tier 1 capital (to risk weighted assets), Amount	1,555,756	1,143,459
Common equity tier 1 capital (to risk weighted assets), Amount	1,555,756	1,104,959
Tier 1 capital (to average assets), Amount	$ 1,555,756	$ 1,143,459
Total capital (to risk weighted assets), Ratio	12.20%	12.70%
Tier 1 capital (to risk weighted assets), Ratio	11.30%	12.30%
Common equity tier 1 capital (to risk weighted assets), Ratio	11.30%	11.90%
Tier 1 capital (to average assets), Ratio	9.70%	10.00%
Total capital (to risk weighted assets) For capital adequacy purposes, Amount	$ 1,097,448	$ 745,543
Tier 1 capital (to risk weighted assets) For capital adequacy purposes, Amount	823,086	559,157
Common equity tier 1 capital (to risk weighted assets) For capital adequacy purposes, Amount	617,315	419,368
Tier 1 capital (to average assets) For capital adequacy purposes, Amount	638,866	455,561
CenterState Bank of Florida, N.A. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets), Amount	1,670,678	1,177,082
Tier 1 capital (to risk weighted assets), Amount	1,630,026	1,137,315
Common equity tier 1 capital (to risk weighted assets), Amount	1,630,026	1,137,315
Tier 1 capital (to average assets), Amount	$ 1,630,026	$ 1,137,315
Total capital (to risk weighted assets), Ratio	12.20%	12.60%
Tier 1 capital (to risk weighted assets), Ratio	11.90%	12.20%
Common equity tier 1 capital (to risk weighted assets), Ratio	11.90%	12.20%
Tier 1 capital (to average assets), Ratio	10.20%	10.00%
Total capital (to risk weighted assets) For capital adequacy purposes, Amount	$ 1,097,258	$ 745,003
Tier 1 capital (to risk weighted assets) For capital adequacy purposes, Amount	822,943	558,753
Common equity tier 1 capital (to risk weighted assets) For capital adequacy purposes, Amount	617,207	419,064
Tier 1 capital (to average assets) For capital adequacy purposes, Amount	638,628	455,515
Total capital (to risk weighted assets) To be well capitalized under Prompt corrective action provision, Amount	1,371,572	931,254
Tier 1 capital (to risk weighted assets) To be well capitalized under Prompt corrective action provision, Amount	1,097,258	745,003
Common equity tier 1 capital (to risk weighted assets) To be well capitalized under Prompt corrective action provision, Amount	891,522	605,315
Tier 1 capital (to average assets) To be well capitalized under Prompt corrective action provision, Amount	$ 798,285	$ 569,394
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets), Ratio	8.00%
Tier 1 capital (to risk weighted assets), Ratio	6.00%
Common equity tier 1 capital (to risk weighted assets), Ratio	4.50%
Tier 1 capital (to average assets), Ratio	4.00%
Total capital (to risk weighted assets) For capital adequacy purposes, Ratio	8.00%	8.00%
Tier 1 capital (to risk weighted assets) For capital adequacy purposes, Ratio	6.00%	6.00%
Common equity tier 1 capital (to risk weighted assets) For capital adequacy purposes, Ratio	4.50%	4.50%
Tier 1 capital (to average assets) For capital adequacy purposes, Ratio	4.00%	4.00%
Minimum [Member] | CenterState Bank of Florida, N.A. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier 1 capital (to risk weighted assets), Ratio	4.50%	4.50%
Total capital (to risk weighted assets) For capital adequacy purposes, Ratio	8.00%	8.00%
Tier 1 capital (to risk weighted assets) For capital adequacy purposes, Ratio	6.00%	6.00%
Tier 1 capital (to average assets) For capital adequacy purposes, Ratio	4.00%	4.00%
Total capital (to risk weighted assets) To be well capitalized under Prompt corrective action provision, Ratio	10.00%	10.00%
Tier 1 capital (to risk weighted assets) To be well capitalized under Prompt corrective action provision, Ratio	8.00%	8.00%
Common equity tier 1 capital (to risk weighted assets) To be well capitalized under Prompt corrective action provision, Ratio	6.50%	6.50%
Tier 1 capital (to average assets) To be well capitalized under Prompt corrective action provision, Ratio	5.00%	5.00%

Dividends and Share Repurchas_2

Dividends and Share Repurchases - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 31, 2019	Sep. 30, 2017
Class Of Stock [Line Items]
Cash dividends declared & paid on common stock		$ 52,400	$ 35,906	$ 13,878
Dividend received from subsidiary banks		141,000	68,000
Available dividends from subsidiary bank		177,208
Number of shares authorized to be repurchased						3,000,000,000
Stock repurchased during period, value		$ 132,077	$ 1,027	$ 1,131
Stock repurchase program expiration date		Apr. 25, 2019
Subsequent Event [Member]
Class Of Stock [Line Items]
Number of shares authorized to be repurchased	6,500,000,000
Stock repurchase program expiration date	Jan. 16, 2022
Stock Repurchase Program Under Two Thousand Seventeen [Member]
Class Of Stock [Line Items]
Number of shares authorized to be repurchased					6,500,000,000
Stock repurchase program expiration date		Apr. 25, 2021
Announced Stock Repurchase Program [Member]
Class Of Stock [Line Items]
Number of shares authorized to be repurchased		5,733,042,000	38,496,000	45,236,000

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Detail) - USD ($)

Apr. 26, 2018

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Sep. 30, 2019

Apr. 01, 2019

Sep. 30, 2018

Jan. 01, 2018

Sep. 30, 2017

May 01, 2017

Dec. 31, 2016

Sep. 30, 2016

Jan. 17, 2014

Apr. 25, 2013

Apr. 24, 2007

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock options outstanding

683,856

655,261

1,119,483

623,490

Average exercise price of shares outstanding

$ 10.94

$ 11.26

$ 11.26

$ 12.30

Employee incentive stock options, granted

0

0

0

Fair value of restricted stock granted

$ 10.99

Number of shares expected to vest in future

681,718

Income tax benefit provided by share based awards

$ 723,000

$ 5,373,000

$ 1,545,000

Expense Recognized

$ 958,000

$ 650,000

624,000

Common stock issued

125,173,597

95,679,596

RSU expense

$ 3,329,000

$ 2,922,000

$ 3,560,000

Director [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock Issued During Period Shares Share Based Compensation

33,536

2018 Equity Incentive Plan [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Maximum number of shares available for issuance

2,200,000

2018 Plan expiration

2028

Employee incentive stock options, granted

0

Shares available for future grants

1,644,184

2018 Equity Incentive Plan [Member] | Employee [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Employee incentive stock options, granted

0

2018 Equity Incentive Plan [Member] | Maximum [Member] | Director [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Maximum value of shares in grants to be issued

$ 150

2013 Equity Incentive Plan [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Maximum number of shares available for issuance

1,600,000

2013 Equity Incentive Plan [Member] | Employee [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Employee incentive stock options, granted

0

2007 Equity Incentive Plan [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Maximum number of shares available for issuance

1,350,000

2007 Equity Incentive Plan [Member] | Employee [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Employee incentive stock options, granted

0

Stock Option [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Remaining unrecognized compensation cost related to non-vested stock options, net of estimated forfeitures

$ 22,000

Non vested stock options, unrecognized compensation cost, recognition period

3 years

Stock Option [Member] | Weighted Average [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Non vested stock options, unrecognized compensation cost, recognition period

1 year 4 months 24 days

Stock Option [Member] | Equity Incentive Plan Member

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock options outstanding

343,418

487,365

Average exercise price of shares outstanding

$ 11.32

$ 10.99

Stock option expiration period

4 years 8 months 12 days

Stock Option [Member] | 2015 Equity Incentive Plan (Sunshine Plan) [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock options outstanding

14,240

590,345

Average exercise price of shares outstanding

$ 15.91

$ 14.84

Stock option expiration period

6 years 3 months 18 days

Stock Option [Member] | 2010 Amended and Restated Stock Incentive Plan (HCBF Plan) [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock options outstanding

63,470

1,621,543

Average exercise price of shares outstanding

$ 13.96

$ 14.80

Stock option expiration period

5 years 3 months 18 days

Stock Option [Member] | Gateway Plans [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock options outstanding

191,828

1,150,517

Average exercise price of shares outstanding

$ 10.53

$ 11.32

Stock option expiration period

2 years 8 months 12 days

Stock Option [Member] | Gulfstream2009 Stock Option Plan

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock options outstanding

40,000

774,104

Average exercise price of shares outstanding

$ 6.15

$ 6.99

Stock option expiration period

1 year 10 months 24 days

Restricted Stock [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of RSAs, granted

120,572

67,502

148,232

Remaining unrecognized compensation cost related to non-vested stock options, net of estimated forfeitures

$ 3,758,000

Non vested stock options, unrecognized compensation cost, recognition period

8 years

Number of RSAs, outstanding

334,779

390,366

559,124

699,965

Restricted Stock [Member] | Underlying Shares Issued [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of RSAs, outstanding

32,500

50,600

69,700

127,901

Restricted Stock [Member] | Underlying Shares Not Issued [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of RSAs, granted

120,572

67,502

148,232

Number of RSAs, outstanding

302,279

339,766

489,424

572,064

Restricted Stock [Member] | Weighted Average [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Non vested stock options, unrecognized compensation cost, recognition period

1 year 10 months 24 days

Restricted Stock [Member] | 2018 Equity Incentive Plan [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of RSAs, granted

120,572

Fair value of restricted stock granted

$ 26.33

Restricted Stock [Member] | 2018 Equity Incentive Plan [Member] | Maximum [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Restricted stock awards vesting period

5 years

Restricted Stock [Member] | 2018 Equity Incentive Plan [Member] | Minimum [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Restricted stock awards vesting period

2 years

Performance Share Units [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Remaining unrecognized compensation cost related to non-vested stock options, net of estimated forfeitures

$ 3,272,000

Non vested stock options, unrecognized compensation cost, recognition period

3 years

Total PSUs approved by compensation committee

38,107

Expense Recognized

$ 892,000

Performance Share Units [Member] | Grant Year 2017 [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Compensation Not yet Recognized, Share-based Awards Other than Options, PSUs

$ 687,000

Performance Share Units [Member] | Grant Year 2018 [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Compensation Not yet Recognized, Share-based Awards Other than Options, PSUs

$ 1,051,000

Performance Share Units [Member] | Grant Year 2019 [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Compensation Not yet Recognized, Share-based Awards Other than Options, PSUs

$ 2,559,000

Performance Share Units [Member] | Weighted Average [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Non vested stock options, unrecognized compensation cost, recognition period

1 year 9 months 18 days

Performance Share Units [Member] | 2018 Equity Incentive Plan [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Performance share units vesting date

Jan. 1, 2023

Number of shares expected to vest in future

120,945

Performance Share Units [Member] | 2018 Equity Incentive Plan [Member] | Maximum [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of shares expected to vest in future

181,402

Performance Share Units [Member] | 2018 Equity Incentive Plan [Member] | Minimum [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of shares expected to vest in future

0

Restricted Stock Units [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of RSAs, granted

84,383

41,630

32,441

Remaining unrecognized compensation cost related to non-vested stock options, net of estimated forfeitures

$ 2,533,000

Non vested stock options, unrecognized compensation cost, recognition period

3 years

Number of RSAs, outstanding

201,661

128,447

86,817

54,376

Compensation Not yet Recognized, Share-based Awards Other than Options, PSUs

$ 720,000

RSU expense

$ 843,000

$ 538,000

$ 287,000

Restricted Stock Units [Member] | Grant Year 2017 [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Compensation Not yet Recognized, Share-based Awards Other than Options, PSUs

$ 1,107,000

Restricted Stock Units [Member] | Grant Year 2018 [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Compensation Not yet Recognized, Share-based Awards Other than Options, PSUs

$ 1,880,000

Restricted Stock Units [Member] | Weighted Average [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Non vested stock options, unrecognized compensation cost, recognition period

1 year 9 months 18 days

Restricted Stock Units [Member] | Vest in January 1, 2021 [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Vesting percentage for each year

33.33%

Restricted Stock Units [Member] | Vest in January 1, 2022 [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Vesting percentage for each year

33.33%

Restricted Stock Units [Member] | Vest in January 1, 2023 [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Vesting percentage for each year

33.33%

Restricted Stock Units [Member] | 2018 Equity Incentive Plan [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of RSAs, granted

84,383

Fair value of restricted stock granted

$ 21.09

Qualified Incentive Stock Options [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Income tax benefit provided by share based awards

$ 0

Non Qualified Incentive Stock Options [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Income tax benefit provided by share based awards

723,000

5,373,000

1,545,000

RSA,RSU and PSU [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Income tax benefit provided by share based awards

$ 1,284,000

$ 1,042,000

$ 1,725,000

Performance Share Units Division | Grant Year2016

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Restricted stock awards vesting period

3 years

Compensation Not yet Recognized, Share-based Awards Other than Options, PSUs

$ 192,000

Expense Recognized

$ 66,000

Common stock issued

12,000

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Stock Based Compensation Expense Recognized (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option expense	$ 19	$ 83	$ 115
Stock-based compensation expense	3,329	2,922	3,560
PSU expense	958	650	624
Total stock-based compensation expense	5,149	4,193	4,586
RSU Expense [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 843	$ 538	$ 287

Equity-Based Compensation - Inf

Equity-Based Compensation - Information Related to Stock Option Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Total intrinsic value of stock options exercised	$ 4,827	$ 1,492	$ 8,039
Net proceeds from stock options exercised	3,101	14,707	6,715
Gross income tax benefit from the exercise of stock options	$ 723	$ 5,373	$ 1,545

Equity-Based Compensation - S_2

Equity-Based Compensation - Summary of Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, beginning of period, Number of Options	655,261	1,119,483	623,490
Options assumed pursuant to acquisition of (note 1):
Options exercised, Number of Options		(1,793,339)	(598,039)
Options forfeited, Number of Options		(882,771)	(56,485)
Options outstanding, end of period, Number of Options	683,856	655,261	1,119,483
Options outstanding, beginning of period, Weighted-Average Exercise Price	$ 11.26	$ 11.26	$ 12.30
Options exercised, Weighted-Average Exercise Price		13.61	12.11
Options forfeited, Weighted-Average Exercise Price		15.37	15
Options outstanding, end of period, Weighted-Average Exercise Price	$ 10.94	$ 11.26	11.26
Stock Options and Warrants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, beginning of period, Number of Options	655,261
Options assumed pursuant to acquisition of (note 1):
Options exercised, Number of Options	(356,366)
Options forfeited, Number of Options	(102,404)
Options outstanding, end of period, Number of Options	683,856	655,261
Options outstanding, beginning of period, Weighted-Average Exercise Price	$ 11.26
Options exercised, Weighted-Average Exercise Price	10.82
Options forfeited, Weighted-Average Exercise Price	13.55
Options outstanding, end of period, Weighted-Average Exercise Price	10.94	$ 11.26
Gateway [Member]
Options assumed pursuant to acquisition of (note 1):
Options assumed pursuant to acquisition of (note 1):, Weighted-Average Exercise Price			$ 11.32
Options assumed pursuant to acquisition of (note 1):, Number of Options			1,150,517
HCBF [Member]
Options assumed pursuant to acquisition of (note 1):
Options assumed pursuant to acquisition of (note 1):, Weighted-Average Exercise Price		$ 14.80
Options assumed pursuant to acquisition of (note 1):, Number of Options		1,621,543
Sunshine [Member]
Options assumed pursuant to acquisition of (note 1):
Options assumed pursuant to acquisition of (note 1):, Weighted-Average Exercise Price		$ 14.84
Options assumed pursuant to acquisition of (note 1):, Number of Options		590,345
NCOM [Member] | Stock Options and Warrants [Member]
Options assumed pursuant to acquisition of (note 1):
Options assumed pursuant to acquisition of (note 1):, Weighted-Average Exercise Price	$ 10.99
Options assumed pursuant to acquisition of (note 1):, Number of Options	487,365

Equity-Based Compensation - S_3

Equity-Based Compensation - Summary of Outstanding, Vested and Expected to Vest and Exercisable Stock Options (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, Number of options	683,856	655,261	1,119,483	623,490
Options fully vested and expected to vest, Number of Options	681,718
Options exercisable, Number of Options	675,356
Options outstanding, Weighted-Average Exercise Price	$ 10.94	$ 11.26	$ 11.26	$ 12.30
Options fully vested and expected to vest, Weighted Average Exercise Price	10.96
Options exercisable, Weighted-Average Exercise Price	$ 10.99
Options outstanding, Weighted-Average Contractual Term	4 years
Options fully vested and expected to vest, Weighted-Average Contractual Term	4 years
Options exercisable, Weighted-Average Contractual Term	4 years
Options outstanding, Aggregate Intrinsic Value	$ 9,599
Options fully vested and expected to vest, Aggregate Intrinsic Value	9,561
Options exercisable, Aggregate Intrinsic Value	$ 9,447

Equity-Based Compensation - S_4

Equity-Based Compensation - Summary of Restricted Stock Awards Activity (Detail) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Awards and Units outstanding, beginning of period	390,366	559,124	699,965
Number of Awards and Units, Granted	120,572	67,502	148,232
Number of Awards and Units, Vested	(166,418)	(233,947)	(284,807)
Number of Awards and Units, Forfeited	(9,741)	(2,313)	(4,266)
Number of Awards and Units, outstanding, end of period	334,779	390,366	559,124
Weighted-Average fair value at grant date of Award and Units, outstanding, beginning of period	$ 19.10	$ 15.89	$ 12.20
Weighted-Average fair value at grant date of Award and Units, Granted	26.33	26.77	24.94
Weighted-Average fair value at grant date of Award and Units, Vested	18.99	13.65	11.52
Weighted-Average fair value at grant date of Award and Units, Forfeited	22.78	18.55	15.76
Weighted-Average fair value at grant date of Award and Units, ending of period	$ 21.65	$ 19.10	$ 15.89
Underlying Shares Not Issued [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Awards and Units outstanding, beginning of period	339,766	489,424	572,064
Number of Awards and Units, Granted	120,572	67,502	148,232
Number of Awards and Units, Vested	(149,318)	(214,847)	(226,606)
Number of Awards and Units, Forfeited	(8,741)	(2,313)	(4,266)
Number of Awards and Units, outstanding, end of period	302,279	339,766	489,424
Underlying Shares Issued [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Awards and Units outstanding, beginning of period	50,600	69,700	127,901
Number of Awards and Units, Vested	(17,100)	(19,100)	(58,201)
Number of Awards and Units, Forfeited	(1,000)
Number of Awards and Units, outstanding, end of period	32,500	50,600	69,700

Equity-Based Compensation - S_5

Equity-Based Compensation - Summary of Restricted Stock Units (Detail) - Restricted Stock Units [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Awards and Units outstanding, beginning of period	128,447	86,817	54,376
Number of Awards and Units, Granted	84,383	41,630	32,441
Number of Awards and Units, Vested and Issued	(8,547)
Number of Awards and Units, Forfeited	(2,622)
Number of Awards and Units, outstanding, end of period	201,661	128,447	86,817
Weighted-Average fair value at grant date of Award and Units, outstanding, beginning of period	$ 20	$ 17	$ 14
Weighted-Average fair value at grant date of Award and Units, Granted	21.09	26.60	22.19
Weighted-Average fair value at grant date of Award and Units, Vested and Issued	12.22
Weighted-Average fair value at grant date of Award and Units, Forfeited	23.45
Weighted-Average fair value at grant date of Award and Units, ending of period	$ 21	$ 20	$ 17

Employee Benefit Plan - Additio

Employee Benefit Plan - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2010Officers	Dec. 31, 2007Officers
Compensation And Retirement Disclosure [Abstract]
Company's contributions for the plan	$ 5,598	$ 3,444	$ 2,249
Eligibility period to participate in the plan	6 months
Additional number of executive officers entered into salary continuation agreements | Officers				5
Number of executive officers entered into salary continuation agreements due to acquisition | Officers					4
Company expensed for the accrual of future salary continuation benefits	$ 1,546	641	568
Salary continuation benefits payable	10,174	7,966	4,834
Asset and the related deferred compensation payable	339	$ 307	$ 1,761
Administration expenses of the trust	$ 5
Number of Valrico state bank executive officers pursuant to acquisition entered into rabbi trust agreement | Officers					2

Parent Company Only Financial_3

Parent Company Only Financial Statements - Condensed Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets:
Cash and due from banks	$ 185,255	$ 107,007
Prepaid expenses and other assets	40,182	31,219
TOTAL ASSETS	17,142,025	12,337,588	$ 7,123,975
Liabilities:
Accounts payable and accrued expenses	90,722	47,842
Corporate debenture	71,343	32,415
Total liabilities	14,245,307	10,366,244
Stockholders’ Equity:
Common stock	1,252	957
Additional paid-in capital	2,407,385	1,699,031
Retained earnings	465,680	293,777
Accumulated other comprehensive income	22,401	(22,421)
Total stockholders’ equity	2,896,718	1,971,344
Total liabilities and stockholders' equity	17,142,025	12,337,588
Parent Company [Member]
Assets:
Cash and due from banks	5,168	1,338
Inter-company receivable from bank subsidiary		2,340
Investment in wholly-owned bank subsidiary	2,967,040	1,999,963
Investment in other wholly-owned subsidiary	3,431	2,761
Prepaid expenses and other assets	5,850	10,506
TOTAL ASSETS	2,981,489	2,016,908
Liabilities:
Accounts payable and accrued expenses	2,428	2,149
Other borrowings	49,577	11,000
Corporate debenture	32,766	32,415
Total liabilities	84,771	45,564
Stockholders’ Equity:
Common stock	1,252	957
Additional paid-in capital	2,407,385	1,699,031
Retained earnings	465,680	293,777
Accumulated other comprehensive income	22,401	(22,421)
Total stockholders’ equity	2,896,718	1,971,344
Total liabilities and stockholders' equity	$ 2,981,489	$ 2,016,908

Parent Company Only Financial_4

Parent Company Only Financial Statements - Condensed Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements Captions [Line Items]
Interest expense	$ (99,604)	$ (47,550)	$ (15,783)
Income before provision for income taxes	294,296	197,459	109,275
Income tax benefit	67,698	41,024	53,480
Net income attributable to CenterState Bank Corporation	225,396	156,435	55,795
Parent Company [Member]
Condensed Financial Statements Captions [Line Items]
Dividend income	144,209	68,000	10,000
Other income		8
Interest expense	(4,374)	(3,415)	(1,363)
Operating expenses	(5,372)	(3,988)	(3,960)
Income before equity in undistributed income of subsidiaries	134,463	60,605	4,677
Equity in undistributed income of subsidiaries	87,898	88,532	48,760
Income before provision for income taxes	222,361	149,137	53,437
Income tax benefit	(3,035)	(7,298)	(2,358)
Net income attributable to CenterState Bank Corporation	$ 225,396	$ 156,435	$ 55,795

Parent Company Only Financial_5

Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 225,396	$ 156,435	$ 55,795
Adjustments to reconcile net income to net cash used in operating activities:
Net changes in accrued interest receivable, prepaid expenses, and other assets	31,028	61,575	(48,145)
Stock based compensation expense	5,149	4,193	4,586
Net cash provided by operating activities	153,337	193,438	22,757
Cash flows from investing activities:
Net cash provided by (used in) investing activities	85,762	(87,994)	(281,271)
Cash flows from financing activities:
Net proceeds from stock options exercised	3,101	14,707	6,715
Stock repurchased	(132,077)	(1,027)	(1,131)
(Decrease) increase in other borrowings	(200,000)	(77,920)	40,268
Proceeds from stock offering, net of offering costs	0	0	63,262
Dividends paid to shareholders	(52,400)	(35,906)	(13,878)
Net cash (used in) provided by financing activities	(116,374)	(18,730)	363,479
Net cash increase in cash and cash equivalents	122,725	86,714	104,965
Cash and cash equivalents, beginning of period	367,333	280,619	175,654
Cash and cash equivalents, end of period	490,058	367,333	280,619
Parent Company [Member]
Cash flows from operating activities:
Net income	225,396	156,435	55,795
Adjustments to reconcile net income to net cash used in operating activities:
Undistributed net earnings of subsidiaries	(87,898)	(88,532)	(48,760)
(Decrease) increase in payables and accrued expenses	(875)	(13,385)	463
Net changes in accrued interest receivable, prepaid expenses, and other assets	9,783	3,998	(40,369)
Stock based compensation expense			1,048
Net cash provided by operating activities	146,406	58,516	(31,823)
Cash flows from investing activities:
Inter-company receivables from subsidiary banks	3,143	(473)	25,145
Net cash from bank acquisition	34,941	(36,037)	(42,601)
Investment in subsidiaries			(25,000)
Cash payments to shareholders	(84)	19,339	(90)
Net cash provided by (used in) investing activities	38,000	(17,171)	(42,546)
Cash flows from financing activities:
Net proceeds from stock options exercised	3,101	14,707	6,715
Stock repurchased	(132,077)	(1,027)	(1,131)
Stock issuance	800	650
(Decrease) increase in other borrowings		(20,000)	20,000
Proceeds from stock offering, net of offering costs			63,262
Dividends paid to shareholders	(52,400)	(35,906)	(13,878)
Net cash (used in) provided by financing activities	(180,576)	(41,576)	74,968
Net cash increase in cash and cash equivalents	3,830	(231)	599
Cash and cash equivalents, beginning of period	1,338	1,569	970
Cash and cash equivalents, end of period	$ 5,168	$ 1,338	$ 1,569

Credit Commitments - Summary of

Credit Commitments - Summary of Credit Commitments (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Credit Commitments, Total	$ 46,905	$ 28,964
Unfunded Loan Commitments - Fixed [Member]
Loss Contingencies [Line Items]
Credit Commitments, Total	257,277	153,680
Unfunded Loan Commitments - Variable [Member]
Loss Contingencies [Line Items]
Credit Commitments, Total	118,291	65,880
Available Lines of Credit [Member]
Loss Contingencies [Line Items]
Credit Commitments, Total	$ 2,818,303	$ 1,514,359

Credit Commitments - Additional

Credit Commitments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Loan commitments period		30 days
Minimum [Member]
Loss Contingencies [Line Items]
Loan commitments percentage of fixed interest rate	2.71%
Loan commitments fixed interest rate, maturity term	1 year
Maximum [Member]
Loss Contingencies [Line Items]
Loan commitments percentage of fixed interest rate	10.90%
Loan commitments fixed interest rate, maturity term	20 years

Basic and Diluted Earnings Pe_3

Basic and Diluted Earnings Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Anti dilutive stock options	0	0	0

Basic and Diluted Earnings Pe_4

Basic and Diluted Earnings Per Share - Factors Used in Earnings Per Share Computations (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic
Net income available to common shareholders		$ 225,396	$ 156,435	$ 55,795
Less: Earnings allocated to participating securities		(88)	(116)	(120)
Net income allocated to common shareholders		$ 225,308	$ 156,319	$ 55,675
Weighted average common shares outstanding including participating securities		119,793,869	87,707,196	57,368,322
Less: Participating securities	[1]	(46,920)	(65,976)	(123,624)
Average shares	[2]	119,746,949	87,641,220	57,244,698
Basic earnings per common share		$ 1.88	$ 1.78	$ 0.97
Diluted
Net income available to common shareholders		$ 225,308	$ 156,319	$ 55,675
Weighted average common shares outstanding for basic earnings per common share	[2]	119,746,949	87,641,220	57,244,698
Add: Dilutive effects of stock based compensation awards		856,874	1,117,633	1,096,115
Average shares and dilutive potential common shares	[2]	120,603,823	88,758,853	58,340,813
Diluted earnings per common share		$ 1.87	$ 1.76	$ 0.95
[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 securities.

Reportable Segments - Reconcili

Reportable Segments - Reconciliation of Reportable Segment Revenues, Expenses and Profit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Interest income	$ 685,332	$ 460,632	$ 251,326
Interest expense	(99,604)	(47,550)	(15,783)
Net interest income	585,728	413,082	235,543
Provision for loan losses	(10,585)	(8,283)	(4,958)
Total other income	166,060	105,127	65,175
Non-interest expense	(446,907)	(312,467)	(186,485)
Income before provision for income taxes	294,296	197,459	109,275
Income tax (provision) benefit	(67,698)	(41,024)	(53,480)
Noncontrolling interest	(1,202)
Net income	226,598	156,435	55,795
Total assets	17,142,025	12,337,588	7,123,975
Operating Segments [Member] | Commercial and Retail Banking [Member]
Segment Reporting Information [Line Items]
Interest income	667,428	445,688	240,583
Interest expense	(85,225)	(36,853)	(11,431)
Net interest income	582,203	408,835	229,152
Provision for loan losses	(10,277)	(7,914)	(5,037)
Total other income	101,162	71,731	36,834
Non-interest expense	(406,187)	(286,191)	(161,946)
Income before provision for income taxes	266,901	186,461	99,003
Income tax (provision) benefit	(61,468)	(43,662)	(49,823)
Noncontrolling interest	(1,202)
Net income	205,433	142,799	49,180
Total assets	16,364,434	11,769,734	6,572,636
Operating Segments [Member] | Correspondent Banking And Capital Markets Division [Member]
Segment Reporting Information [Line Items]
Interest income	17,904	14,944	10,743
Interest expense	(10,004)	(7,282)	(2,989)
Net interest income	7,900	7,662	7,754
Provision for loan losses	(308)	(369)	79
Total other income	64,898	33,388	28,341
Non-interest expense	(35,348)	(22,288)	(20,579)
Income before provision for income taxes	37,142	18,393	15,595
Income tax (provision) benefit	(9,265)	(4,660)	(6,015)
Net income	27,877	13,733	9,580
Total assets	777,197	561,885	506,234
Corporate Overhead and Administration [Member]
Segment Reporting Information [Line Items]
Interest expense	(4,375)	(3,415)	(1,363)
Net interest income	(4,375)	(3,415)	(1,363)
Total other income		8
Non-interest expense	(5,372)	(3,988)	(3,960)
Income before provision for income taxes	(9,747)	(7,395)	(5,323)
Income tax (provision) benefit	3,035	7,298	2,358
Net income	(6,712)	(97)	(2,965)
Total assets	2,981,489	2,016,908	957,253
Elimination Entries [Member]
Segment Reporting Information [Line Items]
Total assets	$ (2,981,095)	$ (2,010,939)	$ (912,148)

Business Combinations - Additio

Business Combinations - Additional Information (Detail) $ / shares in Units, $ in Thousands	Apr. 01, 2019USD ($)SecurityLoan	Sep. 01, 2018USD ($)$ / shares	Jan. 01, 2018USD ($)$ / shares	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Goodwill on the acquisition					$ 1,204,417	$ 802,880	$ 257,683	$ 106,028
Goodwill					$ 1,204,417	802,880	257,683	$ 106,028
Maximum [Member]
Business Acquisition [Line Items]
Estimated economic life					5 years
Minimum [Member]
Business Acquisition [Line Items]
Estimated economic life					3 years
Core Deposits [Member]
Business Acquisition [Line Items]
Estimated economic life					10 years
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			$ 10,474		$ 0		$ 859
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			$ 114,228
Acquisition price			187,852
Purchased credit impaired loans			8,232
Core deposit intangible			8,525
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	12,302	$ 2,060
Goodwill on the acquisition			$ 233,321
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%
Multiplied by the cash consideration each Platinum share is entitled to receive | $ / shares			$ 1.925
Goodwill			$ 233,321
Acquisition price			448,236
Purchased credit impaired loans			36,031
Core deposit intangible			23,625
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					$ 6,162	$ 11,987
Goodwill on the acquisition		$ 197,648
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%
Multiplied by the cash consideration each Platinum share is entitled to receive | $ / shares		$ 2.30
Goodwill		$ 197,648
Acquisition price		389,476
Purchased credit impaired loans		11,432
Core deposit intangible		19,795
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%
National Commerce Corporation [Member]
Business Acquisition [Line Items]
Effective date of acquisition				Apr. 1, 2019
Increase in total assets	36.00%
Increase in total deposits	37.00%
Merger and acquisition related expenses					$ 33,095	$ 33,095
Goodwill on the acquisition	$ 401,537
Per share exchange ratio	1.650
Total purchase consideration	$ 831,696
Loans at fair value	3,327,850
Estimated discount on loans acquired	$ 61,384
Estimated discount to outstanding principal balance	1.80%
Percentage of loan acquired	39.90%
Goodwill	$ 401,537
Acquisition price	831,696
Purchased credit impaired loans	$ 18,616
Number of troubled debt restructure acquired | SecurityLoan	0
Core deposit intangible	$ 39,900
National Commerce Corporation [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated economic life					10 years
National Commerce Corporation [Member] | Purchased Credit-Impaired [Member]
Business Acquisition [Line Items]
Loans with credit deficiencies	$ 18,616
National Commerce Corporation [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Percentage of outstanding stock acquired	100.00%
CBI Holding Company LLC [Member]
Business Acquisition [Line Items]
Total purchase consideration				$ 11,400
Acquisition price				$ 11,400
Percentage of controlling interest acquired by subsidiary				70.00%
Percentage of noncontrolling interest acquired				30.00%

Business Combinations - Summary

Business Combinations - Summary of Purchase Price Calculation (Detail) $ / shares in Units, $ in Thousands	Apr. 01, 2019USD ($)$ / sharesshares	Sep. 01, 2018USD ($)$ / sharesshares	Jan. 01, 2018USD ($)$ / sharesshares
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
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
Number of shares of HCBF common stock outstanding at December 31, 2017 | shares			7,922,479
Number of shares of CenterState common stock less fractional shares | shares			7,050,645
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
CenterState common stock price per share | $ / shares			$ 25.73
Fair value of CenterState common stock issued			$ 387,279
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
Number of shares of HCBF common stock outstanding at December 31, 2017 | shares			22,299,082
Cash consideration each Harbor share is entitled to receive | $ / shares			$ 1.925
Total cash consideration, not including cash for fractional shares			$ 42,932
Number of shares of CenterState common stock less fractional shares | shares			15,051,639
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
CenterState common stock price per share | $ / shares		$ 30.62
Fair value of CenterState common stock issued		$ 349,809
Total cash consideration		35,624
Total consideration paid to common shareholders		385,433
Total purchase price		$ 389,476
Number of shares of HCBF common stock outstanding at December 31, 2017 | shares		15,480,776
Cash consideration each Harbor share is entitled to receive | $ / shares		$ 2.30
Total cash consideration, not including cash for fractional shares		$ 35,624
Cash out of Charter stock options		$ 4,043
Number of shares of CenterState common stock less fractional shares | shares		11,424,214
National Commerce Corporation [Member]
Business Acquisition [Line Items]
Number of shares of common stock outstanding | shares	21,011,352
Per share exchange ratio	1.650
Number of shares of CenterState common stock less fractional shares | shares	34,667,968
CenterState common stock price per share | $ / shares	$ 23.81
Fair value of CenterState common stock issued	$ 825,444
Total cash consideration	20
Total consideration paid to common shareholders	825,464
Fair value of stock options converted to CenterState stock options	5,848
Total purchase price	$ 831,696
Number of shares of HCBF common stock outstanding at December 31, 2017 | shares	21,011,352
Total cash consideration, not including cash for fractional shares	$ 20
Number of shares of CenterState common stock less fractional shares | shares	34,667,968
Fair value of warrants converted to CenterState warrants	$ 384

Business Combinations - Summa_2

Business Combinations - Summary of Purchase Price Calculation (Parenthetical) (Detail) - USD ($) $ in Thousands	Apr. 01, 2019	Sep. 01, 2018	Jan. 01, 2018
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
National Commerce Corporation [Member]
Business Acquisition [Line Items]
Fractional shares	763

Business Combinations - Summa_3

Business Combinations - Summary of Fair Value of Assets Purchased, Including Goodwill and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Apr. 01, 2019	Dec. 31, 2018	Sep. 01, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets:
Goodwill	$ 1,204,417		$ 802,880			$ 257,683	$ 106,028
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
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
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
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
FHLB and other stock					9,488
Other real estate owned					5,144
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
Bank owned life insurance				54,813
Core deposit intangible				19,795
Goodwill				197,648
Deferred tax asset				3,441
Other assets				17,644
Total assets acquired				1,734,541
FHLB and other stock				1,483
Other real estate owned				257
Servicing asset				1,828
Liabilities:
Deposits				1,321,970
Corporate debentures				9,000
Accrued interest payable				1,015
Other liabilities				13,080
Total liabilities assumed				$ 1,345,065
National Commerce Corporation [Member]
Assets:
Cash and cash equivalents		$ 268,524
Loans, held for investment		3,309,234
Purchased credit impaired loans		18,616
Loans held for sale		14,588
Investments		178,488
Accrued interest receivable		11,006
Branch real estate		61,295
Furniture and fixtures		7,204
Bank property held for sale		12,436
Bank owned life insurance		55,474
Core deposit intangible		39,900
Goodwill		401,537
Deferred tax asset		16,285
Other assets		23,663
Total assets acquired		4,437,782
FHLB and other stock		17,076
Other real estate owned		875
Servicing asset		1,581
Liabilities:
Deposits		3,486,732
Securities sold under agreement to repurchase		18,833
Subordinated notes		38,802
Accrued interest payable		2,095
Other liabilities		47,622
Total liabilities assumed		3,606,086
Noncontrolling interest		$ 12,002

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	Apr. 01, 2019	Sep. 01, 2018	Jan. 01, 2018
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
National Commerce Corporation [Member]
Business Acquisition [Line Items]
Contractually required principal and interest	$ 51,527
Non-accretable difference	(29,187)
Cash flows expected to be collected	22,340
Accretable yield	(3,724)
Total purchased credit-impaired loans acquired	$ 18,616

Business Combinations - Summa_5

Business Combinations - Summary of Fair Value of Acquired Loans and Unpaid Principal Balance (Detail) - USD ($) $ in Thousands	Apr. 01, 2019	Sep. 01, 2018	Jan. 01, 2018
Carrying value [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			$ 706,979
Carrying value [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			1,366,473
Carrying value [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		$ 1,164,790
Carrying value [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	$ 3,389,234
Carrying value [Member] | Residential Real Estate [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			148,342
Carrying value [Member] | Residential Real Estate [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			370,611
Carrying value [Member] | Residential Real Estate [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		284,505
Carrying value [Member] | Residential Real Estate [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	615,296
Carrying value [Member] | Commercial Real Estate [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			375,377
Carrying value [Member] | Commercial Real Estate [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			636,517
Carrying value [Member] | Commercial Real Estate [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		567,506
Carrying value [Member] | Commercial Real Estate [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	1,762,480
Carrying value [Member] | Land, Development, Construction [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			58,530
Carrying value [Member] | Land, Development, Construction [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			149,547
Carrying value [Member] | Land, Development, Construction [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		181,128
Carrying value [Member] | Land, Development, Construction [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	363,005
Carrying value [Member] | Commercial, Industrial and Factored Receivables [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			104,811
Carrying value [Member] | Commercial, Industrial and Factored Receivables [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			113,818
Carrying value [Member] | Commercial, Industrial and Factored Receivables [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		88,308
Carrying value [Member] | Commercial, Industrial and Factored Receivables [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	539,698
Carrying value [Member] | Consumer and Other [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			1,770
Carrying value [Member] | Consumer and Other [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			41,660
Carrying value [Member] | Consumer and Other [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		26,221
Carrying value [Member] | Consumer and Other [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	70,058
Carrying value [Member] | Allowance for loan losses on PCI loans [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			18,149
Carrying value [Member] | Allowance for loan losses on PCI loans [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			54,320
Carrying value [Member] | Allowance for loan losses on PCI loans [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		17,122
Carrying value [Member] | Allowance for loan losses on PCI loans [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	38,697
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] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	3,327,850
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] | Residential Real Estate [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	608,705
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] | Commercial Real Estate [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	1,736,653
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] | Land, Development, Construction [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	358,643
Fair Value [Member] | Commercial, Industrial and Factored Receivables [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			99,650
Fair Value [Member] | Commercial, Industrial and Factored Receivables [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			110,630
Fair Value [Member] | Commercial, Industrial and Factored Receivables [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		87,062
Fair Value [Member] | Commercial, Industrial and Factored Receivables [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	536,262
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] | Consumer and Other [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	68,971
Fair Value [Member] | Allowance for loan losses on PCI loans [Member] | Sunshine Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			8,232
Fair Value [Member] | Allowance for loan losses on PCI loans [Member] | HCBF Holding Company, Inc. [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans			$ 36,031
Fair Value [Member] | Allowance for loan losses on PCI loans [Member] | Charter Financial Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans		$ 11,432
Fair Value [Member] | Allowance for loan losses on PCI loans [Member] | National Commerce Corporation [Member]
Business Acquisition [Line Items]
Book Balance and Fair Value of acquired loans	$ 18,616

Business Combinations - Pro-For

Business Combinations - Pro-Forma Financial Information And Actual Results of Acquisition (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Combinations [Abstract]
Net interest income	$ 620,072	$ 623,929
Net income available to common shareholders	$ 257,271	$ 240,107
EPS - basic	$ 2.01	$ 1.90
EPS - diluted	$ 1.99	$ 1.87

Interest Rate Swap Derivative_2

Interest Rate Swap Derivatives - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments Notional And Fair Value [Line Items]
Market value of securities pledged	$ 131,394,000	$ 64,706,000
Amount included in the assessment of effectiveness	0
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments Notional And Fair Value [Line Items]
Derivative, Notional Amount	10,596,427,000	5,743,283,000
Collateral reserve for derivatives	140,913,000	$ 28,345,000
Market value of securities pledged	$ 361,127,000

Interest Rate Swap Derivative_3

Interest Rate Swap Derivatives - Summary Information about the Derivative Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Fair value of interest rate swap derivatives (asset)	$ 273,068	$ 92,475
Fair value of interest rate swap derivatives (liability)	275,033	92,892
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	$ 10,596,427	$ 5,743,283
Weighted average pay rate on interest-rate swaps	3.20%	3.64%
Weighted average receive rate on interest rate swaps	3.20%	3.64%
Weighted average maturity (years)	11 years	11 years
Fair value of interest rate swap derivatives (asset)	$ 273,068	$ 92,475
Fair value of interest rate swap derivatives (liability)	$ 274,216	$ 92,892

Interest Rate Swap Derivative_4

Interest Rate Swap Derivatives - Summary Information about Cash Flow Hedges Included in Condensed Consolidated Balance Sheets (Detail) - Interest Rate Swap [Member] - Cash Flow Hedging [Member] $ in Thousands	Dec. 31, 2019USD ($)
Derivatives Fair Value [Line Items]
Notional amount	$ 150,000
Fair value of interest rate swap derivatives (liability)	$ 817

Interest Rate Swap Derivative_5

Interest Rate Swap Derivatives - Summary Information about Net Unrealized Holding Losses in AOCI and Condensed Consolidated Statements of Income and Comprehensive Income Relating to Cash Flow Derivative Instrument (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Interest Rate Contracts - Pay Fixed, Receive Floating [Member] | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of loss recognized in OCI	$ (613)

Revenue from Contracts with C_2

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 465,680	$ 293,777
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

Leases - Additional Information

Leases - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Initial recognition of operating lease assets	$ 20,311
Initial recognition of operating lease liabilities	22,795
Cumulative adjustment pursuant to adoption of ASU 842	$ 1,093

Leases - Schedule of Lessee Lea

Leases - Schedule of Lessee Leases (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Amortization of ROU Assets - Finance Leases	$ 196
Interest on Lease Liabilities - Finance Leases	215
Operating Lease Cost (Cost resulting from lease payments)	7,453
Variable Lease Cost (Cost excluded from lease payments)	1,211
Total Lease Cost	9,075
Finance Lease - Operating Cash Flows	294
Finance Lease - Financing Cash Flows	294
Operating Lease - Operating Cash Flows (Fixed Payments)	7,585
Operating Lease - Operating Cash Flows (Liability Reduction)	7,131
New operating right-of-use assets	$ 39,205
Weighted Average Lease Term (Years) - Finance Leases	10 years 11 months 4 days
Weighted Average Lease Term (Years) - Operating Leases	7 years 1 month 17 days
Weighted Average Discount Rate - Finance Leases	5.83%
Weighted Average Discount Rate - Operating Leases	3.33%

Leases - Schedule of Maturity A

Leases - Schedule of Maturity Analysis of Undiscounted Cash Flows of Operating Lease Liabilities (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Operating lease payments due:
Within one year	$ 7,577
After one but within two years	6,693
After two but within three years	5,358
After three but within four years	4,419
After four years but within five years	3,723
After five years	11,410
Total undiscounted cash flows	39,180
Discount on cash flows	(4,695)
Total operating lease liabilities	$ 34,485

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Annual Rentals under All Leases (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 6,524
2020	5,096
2021	4,411
2022	3,633
2023	2,558
Thereafter	11,088
Total minimum lease payments	$ 33,310

Leases - Schedule of Lessor Lea

Leases - Schedule of Lessor Leases (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating Lease Income from Lease Payments	$ 1,793
Direct Financing Lease Income	513
Total Lease Income	2,306
Net Investment in Direct Financing Leases	1,391
Maturity Analysis of Operating Lease Receivables
Maturity Analysis of Operating Lease Receivables, 0 - 12 Months	1,978
Maturity Analysis of Operating Lease Receivables, 13 - 24 Months	1,599
Maturity Analysis of Operating Lease Receivables, 25 - 36 Months	897
Maturity Analysis of Operating Lease Receivables, 37 - 48 Months	188
Maturity Analysis of Finance Lease Receivables
Maturity Analysis of Finance Lease Receivables, 0 - 12 Months	916
Maturity Analysis of Finance Lease Receivables, 13 - 24 Months	$ 475

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) $ / shares in Units, $ in Thousands	Feb. 26, 2020$ / sharesshares	Jan. 27, 2020Locationshares	Jan. 31, 2020shares	Dec. 31, 2019USD ($)	Jan. 16, 2020shares	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017shares
Subsequent Event [Line Items]
Total assets | $				$ 17,142,025		$ 12,337,588	$ 7,123,975
Total deposits | $				$ 13,136,392		$ 9,477,336
Number of shares authorized to be repurchased								3,000,000,000
Stock repurchase program expiration date				Apr. 25, 2019
Stock Repurchase Plan [Member]
Subsequent Event [Line Items]
Percentage of outstanding shares under repurchase program				5.00%
Description of stock repurchase plan				The repurchases will be made from time to time by the Company in the open market as conditions allow throughout the plan period from January 16, 2020 to January 16, 2022, unless shortened or extended by the Company’s Board of Directors.  The stock repurchase program does not obligate the Company to repurchase any specified number of shares of its common stock.  The shares may be purchased in open market or negotiated transactions.
South State Corporation [Member]
Subsequent Event [Line Items]
Total assets | $				$ 15,921,092
Gross loans | $				11,370,040
Total deposits | $				$ 12,177,096
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of shares authorized to be repurchased			6,500,000,000
Stock repurchase program expiration date			Jan. 16, 2022
Subsequent Event [Member] | Stock Repurchase Plan [Member]
Subsequent Event [Line Items]
Number of shares authorized to be repurchased					6,500,000
Number of additional common shares repurchased	1,102,934
Weighted average repurchase price under repurchase plan | $ / shares	$ 23.46
Repurchse shares remaining authorized	5,400,000
Subsequent Event [Member] | South State Corporation [Member]
Subsequent Event [Line Items]
Effective date of acquisition		Jan. 25, 2020
Conversion of stock, shares issued		0.3001
Number of service banking locations | Location		157