Seacoast Banking Corporation of Florida (SBCF) 10-K 27 Feb 20 2019 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Jan. 31, 2020	Jun. 30, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	0-13660
Entity Registrant Name	Seacoast Banking Corporation of Florida
Entity Incorporation, State or Country Code	FL
Entity Tax Identification Number	59-2260678
Entity Address, Address Line One	815 Colorado Avenue,
Entity Address, City or Town	Stuart
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	34994
City Area Code	(772)
Local Phone Number	287-4000
Title of 12(b) Security	Common Stock
Trading Symbol	SBCF
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1,309,158,096
Entity Common Stock, Shares Outstanding		51,523,499
Documents Incorporated by Reference	Certain portions of the registrant’s Proxy Statement for the 2020 Annual Meeting of Shareholders (the “ 2020 Proxy Statement”) are incorporated by reference into Part III, Items 10 through 14 of this report. Other than those portions of the 2020 Proxy Statement specifically incorporated by reference herein pursuant to Items 10 through 14, no other portions of the 2020 Proxy Statement shall be deemed so incorporated.
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Central Index Key	0000730708
Current Fiscal Year End Date	--12-31

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest on securities
Taxable	$ 35,354	$ 37,860	$ 34,442
Nontaxable	555	884	913
Interest and fees on loans	250,535	199,984	153,825
Interest on federal funds sold and other investments	3,379	2,670	2,416
Total Interest Income	289,823	241,398	191,596
Interest Expense
Interest on savings deposits	16,621	8,763	3,654
Interest on time certificates	21,776	11,684	4,678
Interest on federal funds purchased and other short term borrowings	1,431	1,804	781
Interest on Federal Home Loan Bank borrowings	3,010	4,468	3,744
Interest on subordinated debt	3,367	3,164	2,443
Total Interest Expense	46,205	29,883	15,300
Net Interest Income	243,618	211,515	176,296
Provision for loan losses	10,999	11,730	5,648
Net Interest Income After Provision for Loan Losses	232,619	199,785	170,648
Noninterest Income (Note M)
Gain on sale of Visa stock	0	0	15,153
Securities gains (losses), net (includes net gains of $6.2 million for 2019, net losses of $96 thousand for 2018 and net gains of $2.0 million for 2017 in other comprehensive income reclassifications)	1,217	(623)	86
Other	55,515	50,645	43,230
Total Noninterest Income	56,732	50,022	58,469
Noninterest Expense (Note M)	160,739	162,273	149,916
Income Before Income Taxes	128,612	87,534	79,201
Income taxes	29,873	20,259	36,336
Net Income	$ 98,739	$ 67,275	$ 42,865
Net income per share of common stock
Diluted (in dollars per share)	$ 1.90	$ 1.38	$ 0.99
Basic (in dollars per share)	$ 1.92	$ 1.40	$ 1.01
Average common shares outstanding
Diluted (in shares)	52,029	48,748	43,350
Basic (in shares)	51,449	47,969	42,613

CONSOLIDATED STATEMENTS OF IN_2

CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Reclassification adjustment for securities gains (losses)	$ 6,200	$ (96)	$ 2,000

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 98,739	$ 67,275	$ 42,865
Other comprehensive income (loss):
Unrealized gains (losses) on securities available-for-sale	24,892	(13,266)	5,976
Reclassification of unrealized losses on securities transferred to available-for-sale upon adoption of new accounting pronouncement	(730)	0	0
Amortization of unrealized losses on securities transferred to held-to-maturity, net	262	550	596
Reclassification adjustment for (gains) losses included in net income	(1,031)	485	(86)
(Provision) benefit for income taxes	(5,868)	3,272	(2,483)
Total Other Comprehensive Income (Loss)	17,525	(8,959)	4,003
Comprehensive Income	$ 116,264	$ 58,316	$ 46,868

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 89,843	$ 92,242
Interest bearing deposits with other banks	34,688	23,709
Total Cash and Cash Equivalents	124,531	115,951
Time deposits with other banks	3,742	8,243
Securities available-for-sale (at fair value)	946,855	865,831
Securities held-to-maturity (fair value $262,213 in 2019 and $349,895 in 2018)	261,369	357,949
Total Debt Securities	1,208,224	1,223,780
Loans held for sale	20,029	11,873
Loans	5,198,404	4,825,214
Less: Allowance for loan losses	(35,154)	(32,423)
Loans, Net of Allowance for Loan Losses	5,163,250	4,792,791
Bank premises and equipment, net	66,615	71,024
Other real estate owned	12,390	12,802
Goodwill	205,286	204,753
Other intangible assets, net	20,066	25,977
Bank owned life insurance	126,181	123,394
Net deferred tax assets	16,457	28,954
Other assets	141,740	128,117
Total Assets	7,108,511	6,747,659
Deposits
Noninterest demand	1,590,493	1,569,602
Interest-bearing demand	1,181,732	1,014,032
Savings	519,152	493,807
Money market	1,108,363	1,173,950
Other time deposits	504,837	513,312
Brokered time certificates	472,857	220,594
Time certificates of more than $250,000	207,319	191,943
Total Deposits	5,584,753	5,177,240
Securities sold under agreements to repurchase, maturing within 30 days	86,121	214,323
Federal Home Loan Bank borrowings	315,000	380,000
Subordinated debt	71,085	70,804
Other liabilities	65,913	41,025
Total Liabilities	6,122,872	5,883,392
Commitments and Contingencies (Notes K and P)
Shareholders' Equity
Common stock, par value $0.10 per share authorized 120,000,000 shares, issued 51,760,617 and outstanding 51,513,733 shares in 2019 and authorized 120,000,000 shares, issued 51,514,734 and outstanding 51,361,079 shares in 2018	5,151	5,136
Additional paid-in capital	786,242	778,501
Retained earnings	195,813	97,074
Less: Treasury stock (246,884 shares in 2019 and 153,655 shares in 2018), at cost	(6,032)	(3,384)
TOTAL Shareholders' Equity Before Accumulated Other Comprehensive loss, net	981,174	877,327
Accumulated other comprehensive income (loss), net	4,465	(13,060)
Total Shareholders' Equity	985,639	864,267
Total Liabilities & Shareholders' Equity	$ 7,108,511	$ 6,747,659

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Held for investment, fair value, total	$ 262,213	$ 349,895
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares issued (in shares)	51,760,617	51,514,734
Common stock, shares outstanding (in shares)	51,513,733	51,361,079
Treasury stock (in shares)	246,884	153,655

CONSOLIDATED STATEMENT OF CASH

CONSOLIDATED STATEMENT 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	$ 98,739	$ 67,275	$ 42,865
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,421	6,353	5,614
Amortization of premiums and discounts on securities, net	2,548	3,196	3,977
Amortization of operating lease right-of-use assets	4,117
Other amortization and accretion, net	(2,005)	(1,158)	(697)
Stock based compensation	7,243	7,823	5,267
Origination of loans designated for sale	(329,177)	(303,928)	(213,027)
Sale of loans designated for sale	333,591	326,328	211,091
Provision for loan losses	10,999	11,730	5,648
Deferred income taxes	6,791	459	35,827
(Gains) losses on sale of securities	(1,031)	485	(86)
Gain on sale of VISA Class B stock	0	0	(15,153)
Gains on sale of loans	(9,794)	(8,961)	(7,038)
Gains on sale and write-downs of other real estate owned	(432)	(107)	(711)
Losses on disposition of fixed assets	511	1,235	2,270
Bank owned life insurance death benefits	(956)	(280)	0
Changes in operating assets and liabilities, net of effects from acquired companies:
Net (increase) decrease in other assets	(5,614)	10,331	(5,506)
Net (decrease) increase in other liabilities	(4,206)	8,827	(21,432)
Net Cash Provided by Operating Activities	117,745	129,608	48,909
Cash Flows From Investing Activities
Maturities and repayments of debt securities available-for-sale	101,674	141,223	211,173
Maturities and repayments of debt securities held-to-maturity	42,495	58,315	86,460
Proceeds from sale of debt securities available-for-sale	202,724	64,366	235,613
Purchases of debt securities available-for-sale	(309,461)	(104,650)	(371,926)
Purchases of debt securities held-to-maturity	0	0	(131,439)
Maturities of time deposits with other banks	4,501	4,310	4,720
Net new loans and principal repayments	(109,614)	(365,816)	(328,868)
Proceeds from the sale of portfolio loans	0	0	106,815
Purchases of loans held for investment	(270,791)	(19,541)	(55,352)
Proceeds from the sale of other real estate owned	6,509	10,072	6,069
Proceeds from sale of FHLB and Federal Reserve Bank Stock	74,120	44,731	48,295
Purchase of FHLB and Federal Reserve Bank Stock	(75,193)	(51,505)	(42,680)
Purchase of Visa Class B stock	0	0	(6,180)
Proceeds from sale of Visa Class B stock	0	21,333	0
Redemption of bank owned life insurance	14,218	4,232	3,609
Purchase of bank owned life insurance	0	0	(30,000)
Net cash from bank acquisitions	0	22,349	23,825
Additions to bank premises and equipment	(2,523)	(4,019)	(5,710)
Net Cash Used in Investing Activities	(321,341)	(174,600)	(245,576)
Cash Flows From Financing Activities
Net increase (decrease) in deposits	407,513	(39,769)	333,049
Net (decrease) increase in federal funds purchased and repurchase agreements	(128,202)	(1,771)	11,892
Net (decrease) increase in FHLB borrowings with original maturities of three months or less	(67,000)	32,000	(204,000)
Repayments of FHLB borrowings with original maturities of more than three months	(63,000)	0	0
Proceeds from FHLB borrowings with original maturities of more than three months	65,000	60,000	0
Stock based employee benefit plans	(2,135)		(55)
Stock based employee benefit plans		979
Issuance of common stock, net of related expense	0	0	55,641
Dividends paid	0	0	0
Net Cash Provided by Financing Activities	212,176	51,439	196,527
Net increase (decrease) in cash and cash equivalents	8,580	6,447	(140)
Cash and cash equivalents at beginning of year	115,951	109,504	109,644
Cash and Cash Equivalents at End of Year	124,531	115,951	109,504
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	46,130	28,301	15,125
Cash paid during the period for taxes	16,000	13,200	400
New operating lease right-of-use assets	30,301
New operating lease liabilities	34,627
Supplemental disclosure of non cash investing activities:
Transfer of debt securities from held-to-maturity to available-for-sale	52,796	0	0
Transfer from loans to other real estate owned	5,665	5,549	1,774
Transfer from bank premises to other real estate owned	0	9,168	1,212
Transfer from loans held for investment to loans held for sale	$ 801	$ 0	$ 5,664

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings (Accumulated Deficit)	Treasury Stock	Accumulated Other Comprehensive Income (Loss), Net
Beginning balance (in shares) at Dec. 31, 2016		38,022
Beginning balance at Dec. 31, 2016	$ 435,397	$ 3,802	$ 454,001	$ (13,657)	$ (1,236)	$ (7,513)
Comprehensive income	46,868			42,865		4,003
Reclassification of disproportionate tax effects upon adoption of new accounting pronouncement	0			706		(706)
Stock based compensation expense	5,267		5,267
Common stock issued for stock based employee benefit plans (in shares)		61
Common stock issued for stock based employee benefit plans	(1,138)		(15)		(1,123)
Common stock issued for stock options (in shares)		91
Common stock issued for stock options	1,082	$ 16	1,066
Issuance of common stock, net of related expenses (in shares)		2,703
Issuance of common stock, net of related expenses	55,641	$ 270	55,371
Issuance of common stock, pursuant to acquisition (in shares)		6,041
Issuance of common stock, pursuant to acquisition	146,547	$ 605	145,942
Ending balance (in shares) at Dec. 31, 2017		46,918
Ending balance at Dec. 31, 2017	689,664	$ 4,693	661,632	29,914	(2,359)	(4,216)
Comprehensive income	58,316			67,275		(8,959)
Stock based compensation expense (in shares)		32
Stock based compensation expense	7,823		7,823
Common stock issued for stock based employee benefit plans (in shares)		43
Common stock issued for stock based employee benefit plans	(1,031)		(6)		(1,025)
Common stock issued for stock options (in shares)		368
Common stock issued for stock options	2,009	$ 43	1,966
Issuance of common stock, pursuant to acquisition (in shares)		4,000
Issuance of common stock, pursuant to acquisition	107,486	$ 400	107,086
Ending balance (in shares) at Dec. 31, 2018		51,361
Ending balance at Dec. 31, 2018	864,267	$ 5,136	778,501	97,074	(3,384)	(13,060)
Comprehensive income	116,264			98,739		17,525
Stock based compensation expense (in shares)		30
Stock based compensation expense	7,244		7,244
Common stock issued for stock based employee benefit plans (in shares)		94
Common stock issued for stock based employee benefit plans	(2,668)	$ 12	(32)		(2,648)
Common stock issued for stock options (in shares)		29
Common stock issued for stock options	428	$ 3	425
Other	104		104
Ending balance (in shares) at Dec. 31, 2019		51,514
Ending balance at Dec. 31, 2019	$ 985,639	$ 5,151	$ 786,242	$ 195,813	$ (6,032)	$ 4,465

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies General: Seacoast Banking Corporation of Florida (“Seacoast” or the “Company”) is a single segment financial holding company with one operating subsidiary bank, Seacoast National Bank (“Seacoast Bank”). The Company provides integrated financial services including commercial and retail banking, wealth management, and mortgage services to customers through advanced banking solutions, 48 traditional branch offices and nine commercial banking centers operated by Seacoast Bank. Seacoast operates primarily in Florida, with concentrations in the state's fastest growing markets, each with unique characteristics and opportunities. Offices stretch from the southeast, including Fort Lauderdale, Boca Raton and Palm Beach north along the east coast to the Daytona area, into Orlando and Central Florida and the adjacent Tampa market, and west to Okeechobee and surrounding counties. The consolidated financial statements include the accounts of Seacoast and all its majority-owned subsidiaries but exclude trusts created for the issuance of trust preferred securities. In consolidation, all significant intercompany accounts and transactions are eliminated. The accounting and reporting policies of the Company are in accordance with accounting principles generally accepted in the United States of America, and they conform to general practices within the applicable industries. Certain prior period amounts have been reclassified to conform to the current period presentation. Use of Estimates: The preparation of consolidated financial statements requires management to make judgments in the application of certain accounting policies that involve significant estimates and assumptions. The Company has established policies and control procedures that are intended to ensure valuation methods are well controlled and applied consistently from period to period. These estimates and assumptions, which may materially affect the reported amounts of certain assets, liabilities, revenues and expenses, are based on information available as of the date of the financial statements, and changes in this information over time and the use of revised estimates and assumptions could materially affect amounts reported in subsequent financial statements. Specific areas, among others, requiring the application of management’s estimates include determination of the allowance for loan losses, acquisition accounting and purchased loans, intangible assets and impairment testing, other fair value adjustments, other than temporary impairment of securities, income taxes and realization of deferred tax assets and contingent liabilities. Cash and Cash Equivalents: Cash and cash equivalents include cash and due from banks and interest-bearing bank balances. Cash equivalents have original maturities of three months or less, and accordingly, the carrying amount of these instruments is deemed to be a reasonable estimate of fair value Time deposits with other banks: Time deposits with other banks consist of certificates of deposit with original maturities greater than three months and are carried at cost. Securities Purchased and Sold Agreements: Securities purchased under resale agreements and securities sold under repurchase agreements are generally accounted for as collateralized financing transactions and are recorded at the amount at which the securities were acquired or sold plus accrued interest. It is the Company’s policy to take possession of securities purchased under resale agreements, which are primarily U.S. government and government agency securities. The fair value of securities purchased and sold is monitored and collateral is obtained from or returned to the counterparty when appropriate. Securities: Debt securities are classified at date of purchase as available-for-sale or held-to-maturity. Debt securities that may be sold as part of the Company's asset/liability management or in response to, or in anticipation of, changes in interest rates and resulting prepayment risk, or for other factors are stated at fair value with unrealized gains or losses reflected as a component of shareholders' equity net of tax or included in noninterest income as appropriate. Debt securities that the Company has the ability and intent to hold to maturity are carried at amortized cost. Equity securities are stated at fair value with unrealized gains or losses included in noninterest income as securities gains or losses. The estimated fair value of a security is determined based on market quotations when available or, if not available, by using quoted market prices for similar securities, pricing models or discounted cash flow analyses, using observable market data where available. Realized gains and losses, including other than temporary impairments, are included in noninterest income as investment securities gains (losses). Interest and dividends on securities, including amortization of premiums and accretion of discounts on debt securities, is recognized in interest income on an accrual basis using the interest method. The Company anticipates prepayments of principal in the calculation of the effective yield for collateralized mortgage obligations and mortgage backed securities by obtaining estimates of prepayments from independent third parties. The adjusted cost of each specific security sold is used to compute realized gains or losses on the sale of securities on a trade date basis. On a quarterly basis, the Company makes an assessment to determine whether there have been any events or economic circumstances to indicate that a security is impaired on an other than temporary basis. Management considers many factors including the length of time the security has had a fair value less than the cost basis; recent events specific to the issuer or industry; external credit ratings and recent downgrades. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a debt security in an unrealized loss position before recovery of its amortized cost basis. Debt securities for which there is an unrealized loss that is deemed to be other-than temporary are written down to fair value with the write-down recorded as a realized loss. On January 1, 2019, the Company adopted Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") 2017-12 “Derivatives and Hedging" (Topic 815): Targeted Improvements to Accounting for Hedging Activities. Upon adoption, certain debt securities were reclassified from held-to-maturity to available-for-sale. The following table summarizes the impact: January 1, 2019 (In thousands) Amortized Cost Net Unrealized Gain (Loss) Reflected in OCI Fair Value Private mortgage-backed securities and collateralized mortgage obligations $ 21,526 $ 147 $ 21,673 Collateralized loan obligations 32,000 (877 ) 31,123 Totals $ 53,526 $ (730 ) $ 52,796 Seacoast Bank is a member of the Federal Home Loan Bank (“FHLB”) system. Members are required to own a certain amount of FHLB stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB stock is carried at cost, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income. Loans: The Company accounts for a loan depending on the strategy for the loan and on the credit impaired status of the loan upon acquisition. Loans are accounted for using the following categories: • Loans and leases held for sale • Loans and leases originated by the Company and held for investment • Loans and leases purchased by the Company, which are considered purchased unimpaired (“PUL), and held for investment • Loans and leases purchased by the Company, which are considered purchased credit impaired (“PCI”) Loans that are held for sale are carried as held for sale based on management’s intent to sell the loans, either as part of a core business strategy or related to a risk mitigation strategy. Loans held for sale and any related unfunded lending commitments are recorded at fair value, if elected, or the lower of cost (which is the carrying amount net of deferred fees and costs and applicable allowance for loan losses and reserve for unfunded lending commitments) or fair market value less costs to sell. Adjustments to reflect unrealized gains and losses resulting from changes in fair value and realized gains and losses upon ultimate sale of the loans are classified as noninterest income in the Consolidated Statements of Income. At the time of the transfer to loans held for sale, if the fair market value is less than cost, the difference is recorded as additional provision for credit losses in the results of operations. Fair market value is determined based on quoted market prices for the same or similar loans, outstanding investor commitments or discounted cash flow analyses using market assumptions. Fair values are based upon estimated values to be received from independent third party purchasers. These loans are intended for sale and the Company believes the fair value is the best indicator of the resolution of these loans. Fair market value changes occur due to changes in interest rates, the borrower’s credit, the secondary loan market and the market for a borrower’s debt. Individual loans or pools of loans are transferred from the loan portfolio to loans held for sale when the intent to hold the loans has changed and there is a plan to sell the loans within a reasonable period of time. Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are considered held for investment. Loans originated by Seacoast and held for investment are recognized at the principal amount outstanding, net of unearned income and amounts charged off. Unearned income includes discounts, premiums and deferred loan origination fees reduced by loan origination costs. Unearned income on loans is amortized to interest income over the life of the related loan using the effective interest rate method. Interest income is recognized on an accrual basis. As a part of business acquisitions, the Company acquires loans which are recorded at fair value on the acquisition date. Accordingly, the associated allowance for credit losses related to these loans is not carried over at the acquisition date. Any losses after acquisition are recognized through the allowance for loan losses. These loans fall into two groups: purchased unimpaired loans (“PUL”) and purchased credit-impaired loans (“PCI”). PULs demonstrate no evidence of significant credit deterioration and there is an expectation that all contractual payments will be made. The Company determines fair value by estimating the amount and timing of expected future cash flows and assigning a discount or premium to each loan. The difference between the expected cash flows and the amount paid is recorded as interest income over the remaining life of the loan. PCI loans demonstrate evidence of credit deterioration since origination and the risk that all contractual payments will not be made. The Company estimates fair value by estimating 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 on a quarterly basis. Probable decreases in expected loan principal cash flows trigger the recognition of impairment, which is then measured as the present value of the expected principal loss plus any related foregone interest cash flows discounted at the loan’s effective interest rate. Impairments that occur after the acquisition date are recognized through the 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. 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. 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. In contrast, PULs are evaluated using the same procedures as used for the Company’s non-purchased loan portfolio. Under certain scenarios, the Company will grant modifications to a loan when a borrower is experiencing financial difficulties. Such modifications allow the Company to minimize the risk of loss on the loan and maximize future cash flows received from the borrower. Such modifications are referred to as troubled debt restructured (TDR) loans. TDRs are considered impaired and placed in nonaccrual status. If borrowers perform pursuant to the modified loan terms for at least six months and the remaining loan balances are considered collectible, the loans are returned to accrual status. The Company reviews all loans for impairment on a periodic basis. A loan is considered to be impaired when, based on current information, it is probable the Company will not receive all amounts due in accordance with the contractual terms of a loan agreement. The fair value is measured based on either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. When the ultimate collectability of the principal balance of an impaired loan is in doubt, all cash receipts are applied to principal. Once the recorded principal balance has been reduced to zero, future cash receipts are applied to interest income, to the extent any interest has been forgone, and then they are recorded as recoveries of any amounts previously charged off. The accrual of interest is generally discontinued on loans, except consumer loans, that become 90 days past due as to principal or interest unless collection of both principal and interest is assured by way of collateralization, guarantees or other security. When interest accruals are discontinued, unpaid interest is reversed against interest income. Consumer loans that become 120 days past due are generally charged off. When borrowers demonstrate over an extended period the ability to repay a loan in accordance with the contractual terms of a loan classified as nonaccrual, the loan is returned to accrual status. Interest income on nonaccrual loans is either recorded using the cash basis method of accounting or recognized after the principal has been reduced to zero, depending on the type of loan. Derivatives : The Company enters into derivative contracts with customers who request such services and into offsetting contracts with substantially matching terms with third parties to minimize the risks involved with these types of transactions. Loan Commitments and Letters of Credit: Loan commitments and letters of credit are an off-balance sheet item and represent commitments to make loans or lines of credit available to borrowers. The face amount of these commitments represents an exposure to loss, before considering customer collateral or ability to repay. Such commitments are recognized as loans when funded. Fees received for providing loan commitments and letters of credit that may result in loans are typically deferred and amortized to interest income over the life of the related loan, beginning with the initial borrowing. Fees on commitments and letters of credit are amortized to noninterest income as banking fees and commissions on a straight-line basis over the commitment period when funding is not expected. Fair Value Measurements: The Company measures or monitors many of its assets and liabilities on a fair value basis. Certain assets are measured on a recurring basis, including available-for-sale securities and loans held for sale. These assets are carried at fair value on the Company’s balance sheets. Additionally, fair value is measured on a non-recurring basis to evaluate assets or liabilities for impairment or for disclosure purposes. Examples include impaired loans, OREO, mortgage servicing rights, goodwill, and long-lived assets. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, the Company uses various valuation techniques and assumptions when estimating fair value. The Company applies the following fair value hierarchy: Level 1 – Assets or liabilities for which the identical item is traded on an active exchange, such as publicly-traded instruments or futures contracts. Level 2 – Assets and liabilities valued based on observable market data for similar instruments. Level 3 – Assets and liabilities for which significant valuation assumptions are not readily observable in the market; instruments valued based on the best available data, some of which is internally-developed, and considers risk premiums that a market participant would require. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at and/or marked to fair value, the Company considers the principal market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability. When possible, the Company looks to active and observable markets to price identical assets or liabilities. When identical assets and liabilities are not traded in active markets, the Company looks to market observable data for similar assets and liabilities. Nevertheless, certain assets and liabilities are not actively traded in observable markets and the Company must use alternative valuation techniques to derive a fair value measurement. Other Real Estate Owned: Other real estate owned (“OREO”) consists primarily of real estate acquired in lieu of unpaid loan balances. These assets are carried at an amount equal to the loan balance prior to foreclosure plus costs incurred for improvements to the property, but no more than the estimated fair value of the property less estimated selling costs. Any valuation adjustments required at the date of transfer are charged to the allowance for loan losses. Subsequently, unrealized losses and realized gains and losses are included in other noninterest expense. Operating results from OREO are recorded in other noninterest expense. OREO may also include bank premises no longer utilized in the course of the Company's business (closed branches) that are initially recorded at the lower of carrying value or fair value, less costs to sell. If fair value of the premises is less than amortized book value, a write down is recorded through noninterest expense. Costs to operate the facility are expensed. Bank Premises and Equipment: Bank premises and equipment are stated at cost, less accumulated depreciation and amortization. Premises and equipment include certain costs associated with the acquisition of leasehold improvements. Depreciation and amortization are recognized principally by the straight-line method, over the estimated useful lives as follows: buildings - 25 - 40 years, leasehold improvements 5 - 25 years, furniture and equipment - 3 - 12 years. Leasehold improvements typically amortize over the shorter of lease terms or estimated useful life. Premises and equipment and other long-term assets are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are written down to fair value with a corresponding impact to noninterest expense Leases: On January 1, 2019, the Company adopted FASB ASU 2016-02, “Leases”, and all the related amendments (collectively, Accounting Standards Codification “ASC” Topic 842) through a cumulative-effect adjustment. The new guidance requires a lessee to recognize at the transition date right-of-use assets ("ROUA") and lease liabilities for all operating leases. Upon adoption, the Company recognized ROUAs of $29 million and lease liabilities of $33 million . Operating lease liabilities are measured based on the present value of lease payments over the lease term. At the transition date, ROUA was determined by adjusting lease liabilities for the carrying balances of deferred rent under ASC Topic 840 Leases , cease-use liabilities under ASC Topic 420 Exit or Disposal Cost Obligations , and assets and liabilities recognized under ASC Topic 805 Business Combinations for acquired operating leases, which aggregated to $4 million . Arrangements are analyzed at inception to determine the existence of a lease. ROUAs represent the right to use the underlying asset and lease liabilities represent the obligation to make lease payments for the lease term. Operating lease ROUAs and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the appropriate term and information available at commencement date in determining the present value of lease payments. The lease term may include options to extend the lease when it is reasonably certain that the option will be exercised. ROUAs and operating lease liabilities are reported in Other Assets and Other Liabilities, respectively, in the Consolidated Balance Sheet. Lease expense for lease payments is recognized on a straight-line basis over the lease term and is classified as Occupancy or Furniture and Equipment expense based on the subject asset. The Company elected certain practical expedients offered by the FASB for all classes of leased assets. As a result, the Company has not reassessed whether existing contracts are or contain leases, nor has the Company reassessed the classification of existing leases. The Company elected not to separate lease and non-lease components and instead accounts for them as a single lease component. The Company also elected to exclude short-term leases from the recognition of ROUAs and lease liabilities. Therefore, if the lease term is equal to or less than twelve months (including the renewal options that we are reasonably certain to exercise) and we are not reasonably certain to exercise any available purchase options in the lease, we do not apply the new lease accounting guidance for those leases. The Company did not elect the hindsight practical expedient, which allows entities to use hindsight when determining lease term and impairment of ROUAs. Intangible assets. The Company’s intangible assets consist of goodwill, core deposit intangibles (CDIs) and mortgage servicing rights. Goodwill results from business combinations and represents the difference between the purchase price and the fair value of net assets acquired. Goodwill may be adjusted for up to one year from the acquisition date in the event new information is obtained which, if known at the date of acquisitions would have impacted the fair value of the acquired assets and liabilities. Goodwill is considered to have an indefinite useful life and is not amortized, but rather tested for impairment annually in the fourth quarter, or more often if circumstances arise that may indicate risk of impairment. If impaired, goodwill is written down with a corresponding impact to noninterest expense. The Company recognizes CDIs that result from either whole bank acquisitions or branch acquisitions. They are initially measured at fair value and then amortized over periods ranging from six to eight years on a straight line basis. The Company evaluates CDIs for impairment annually, or more often if circumstances arise that may indicate risk of impairment. If impaired, the CDI is written down with a corresponding impact to noninterest expense. Bank owned life insurance (BOLI): The Company, through its subsidiary bank, has purchased or acquired through bank acquisitions, life insurance policies on certain key executives. BOLI 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. Revenue Recognition: Revenue recognized reflects the consideration to which the Company expects to be entitled in exchange for the services provided and is recognized when the promised services (performance obligations) are transferred to a customer, requiring the application of the following five-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. Relevant activity includes: • Service Charges on Deposits: Seacoast Bank offers a variety of deposit-related services to its customers through several delivery channels including branch offices, ATMs, telephone, mobile, and internet banking. Transaction-based fees are recognized when services, each of which represents a performance obligation, are satisfied. Service fees may be assessed monthly, quarterly, or annually; however, the account agreements to which these fees relate can be canceled at any time by Seacoast and/or the customer. Therefore, the contract term is considered a single day (a day-to-day contract). • Trust Fees: The Company earns trust fees from fiduciary services provided to trust customers which include custody of assets, recordkeeping, collection and distribution of funds. Fees are earned over time and accrued monthly as the Company provides services, and are generally assessed based on the market value of the trust assets under management at a particular date or over a particular period. • Brokerage Commissions and Fees: The Company earns commissions and fees from investment brokerage services provided to its customers through an arrangement with a third-party service provider. Commissions received from the third-party service provider are recorded monthly and are based upon customer activity. Fees are earned over time and accrued monthly as services are provided. The Company acts as an agent in this arrangement and therefore presents the brokerage commissions and fees net of related costs. • Interchange Income: Fees earned on card transactions depend upon the volume of activity, as well as the fees permitted by the payment network. Such fees are recognized by the Company upon fulfilling its performance obligation to approve the card transaction. Allowance for Loan Losses and Reserve for Unfunded Lending Commitments: The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when the Company believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. The allowance for loan losses and reserve for unfunded lending commitments is maintained at a level the Company believes is adequate to absorb probable losses incurred in the loan portfolio and unfunded lending commitments as of the date of the consolidated financial statements. The Company employs a variety of modeling and estimation tools in developing the appropriate allowance for loan losses and reserve for unfunded lending commitments. If necessary, a specific allowance is established for individually evaluated impaired loans. The specific allowance established for these loans is based on a thorough analysis of the most probable source of repayment, including the present value of the loan’s expected future cash flows, the loan’s estimated market value, or the estimated fair value of the underlying collateral depending on the most likely source of repayment. General allowances are established for loans grouped into pools based on similar characteristics. In this process, general allowance factors are based on an analysis of historical charge-off experience, portfolio trends, regional and national economic conditions, and expected loss given default derived from the Company’s internal risk rating process. The Company monitors qualitative and quantitative trends in the loan portfolio, including changes in the levels of past due, criticized and nonperforming loans. The distribution of the allowance for loan losses and reserve for unfunded lending commitments between the various components does not diminish the fact that the entire allowance for loan losses and reserve for unfunded lending commitments is available to absorb credit losses in the loan portfolio. The principal focus is, therefore, on the adequacy of the total allowance for loan losses and reserve for unfunded lending commitments. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Company’s bank subsidiary’s allowance for loan losses and reserve for unfunded lending commitments. These agencies may require such subsidiary to recognize changes to the allowance for loan losses and reserve for unfunded lending commitments based on their judgments about information available to them at the time of their examination. Income Taxes : The Company uses the asset and liability method of accounting for income taxes. Deferred tax assets and liabilities are determined based on temporary differences between the carrying amounts of assets and liabilities in the consolidated financial statements and their related tax bases and are measured using the enacted tax rates and laws that are in effect. A valuation allowance is recognized for a deferred tax asset if, based on the weight of available evidence, it is more likely than not that some portion or all of the deferred tax asset will not be realized. The effect on deferred tax assets and liabilities of a change in rates is recognized as income or expense in the period in which the change occurs. Earnings per Share: Basic earnings per share are computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during each period. Diluted earnings per share are based on the weighted-average number of common shares outstanding during each period, plus common share equivalents calculated for stock options and performance restricted stock outstanding using the treasury stock method. Stock-Based Compensation: The stock option plans are accounted for under ASC Topic 718 - Compensation - Stock Compensation and the fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with market assumptions. This amount is amortized on a straight-line basis over the vesting period, generally five years . For restricted stock awards, which generally vest based on continued service with the Company, the deferred compensation is measured as the fair value of the shares on the date of grant, and the deferred compensation is amortized as salaries and employee benefits in accordance with the applicable vesting schedule, generally straight-line over five years . Some shares vest based upon the Company achieving certain performance goals and salary amortization expense is based on an estimate of the most likely results on a straight line basis. The Company accounts for forfeitures as they occur.

Recently Issued Accounting Stan

Recently Issued Accounting Standards, Not Adopted at December 31, 2019	12 Months Ended
	Dec. 31, 2019
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Standards, Not Adopted at December 31, 2019	Recently Issued Accounting Standards, Not Adopted at December 31, 2019 The following provides a brief description of accounting standards that have been issued but are not yet adopted that could have a material effect on the Company's financial statements: ASU 2016-13, Financial Instruments –Credit Losses (Topic 326) Description In June 2016, FASB issued guidance to replace the incurred loss model with an expected loss model, which is referred to as the current expected credit loss (CECL) model. The CECL model is applicable to the measurement of credit losses on financial assets measured at amortized cost, including loan receivables and held-to-maturity debt securities. It also applies to off-balance sheet credit exposures not accounted for as insurance (i.e. loan commitments, standby letters of credit, financial guarantees and other similar instruments). Date of Adoption The Company will adopt this accounting standard effective January 1, 2020. Effect on the Consolidated Financial Statements The Company currently expects that the initial adjustment to the allowance for loan losses will be an increase of approximately $19 - $23 million, bringing the ratio of allowance to total loans from 0.68% to between 1.06% and 1.12%. The increase is primarily attributed to the impact of the new guidance on the Company’s acquired loan portfolio, and to the new requirement to estimate losses over the full remaining expected life of the loans. For loans previously classified as purchased unimpaired (“PUL”), the standard requires that a reserve for expected credit losses be recorded through a cumulative effect adjustment in retained earnings, regardless of the impact of a purchase discount on the amortized cost basis. Existing purchase discounts and premiums on these loans are not affected by adoption of the standard, and these amounts will continue to accrete into interest income over the remaining lives of the loans on a level-yield basis. Existing purchased credit impaired (“PCI”) loans will be classified as purchased credit deteriorated (“PCD”) loans, and a reserve for expected credit losses will be established with a corresponding adjustment to the loans’ amortized cost basis. The remaining non-credit discounts on these loans will accrete into interest income on a level-yield basis over the remaining lives of the loans. The estimation process applies an economic forecast scenario which, as of January 1, 2020, projects a stable macroeconomic environment over the Company’s three year forecast period. For portfolio segments with a weighted average life longer than three years, the Company reverts to longer term historical loss experience, adjusted for prepayments, to estimate losses over the remaining life of the loans within each segment. The Company estimates the impact on the tier one capital ratio upon adoption is a decrease of approximately 32 basis points. Federal banking regulatory agencies have provided banks with the ability to mitigate the impact on capital at adoption by allowing the impact to be phased in over a four year period; however, the Company expects to forgo the phased in approach and recognize the impact to capital at the time of adoption. The Company does not expect adoption of the standard to have a material impact to its held-to-maturity debt security portfolio, which is comprised of securities guaranteed either explicitly or implicitly by government-sponsored entities. While available-for-sale debt (“AFS”) securities are not subject to the CECL allowance requirement, the new guidance requires the Company to record an allowance for AFS debt securities in an unrealized loss position if a portion of the unrealized loss is credit related. The Company does not expect adoption of the standard to have a material impact to AFS securities upon adoption. The disclosed estimates are subject to further refinement upon finalization of the Company’s review of the calculations, assumptions, methodologies and judgments. Internal controls over financial reporting relating to these new processes have been designed and implemented and are being evaluated. The Company is in the final stages of completing the formal governance and approval process. The ongoing impact to the Company’s results of operations in future periods will be influenced by the loan portfolio composition and by macroeconomic conditions and forecasts at each reporting date. Adoption of the standard is expected to result in higher volatility in the quarterly provision for credit losses when compared to the Company’s historical results under the incurred loss model. ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Description In January 2017, the FASB amended the existing guidance to simplify the goodwill impairment measurement test by eliminating Step 2. The amendment requires the Company to perform the goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognizing an impairment charge for the amount by which the carrying amount exceeds the fair value. Additionally, an entity should consider the tax effects from any tax deductible goodwill on the carrying amount when measuring the impairment loss. Date of Adoption This amendment is effective for public business entities for reporting periods beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted on annual goodwill impairment tests performed after January 1, 2017. Effect on the Consolidated Financial Statements The impact to the consolidated financial statements from the adoption of this pronouncement is not expected to be material.

Cash, Dividend and Loan Restric

Cash, Dividend and Loan Restrictions	12 Months Ended
	Dec. 31, 2019
Cash, Dividend and Loan Restrictions [Abstract]
Cash, Dividend and Loan Restrictions	Cash, Dividend and Loan Restrictions In the normal course of business, the Company and Seacoast Bank enter into agreements, or are subject to regulatory agreements that result in cash, debt and dividend restrictions. A summary of the most restrictive items follows: Seacoast Bank may be required to maintain reserve balances with the Federal Reserve Bank. The reserve requirement at December 31, 2019 was $38.7 million . There was no reserve requirement at December 31, 2018 . The average amount of the reserve requirement in 2019 was $7.9 million compared to $0.9 million in 2018 . Under Federal Reserve regulation, Seacoast Bank is limited as to the amount it may loan to its affiliates, including the Company, unless such loans are collateralized by specified obligations. At December 31, 2019 , the maximum amount available for transfer from Seacoast Bank to the Company in the form of loans approximated $83.1 million , if the Company has sufficient acceptable collateral. There were no loans made to affiliates during the periods ending December 31, 2019 and 2018 .

Securities

Securities	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The amortized cost, gross unrealized gains and losses and fair value of securities available-for-sale and held-to-maturity at December 31, 2019 and December 31, 2018 are summarized as follows: December 31, 2019 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt Securities Available-for-Sale U.S. Treasury securities and obligations of U.S. government agencies $ 9,914 $ 204 $ (4 ) $ 10,114 Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities 604,934 5,784 (1,511 ) 609,207 Private mortgage-backed securities and collateralized mortgage obligations 56,005 1,561 (5 ) 57,561 Collateralized loan obligations 239,364 7 (1,153 ) 238,218 Obligations of state and political subdivisions 30,548 1,208 (1 ) 31,755 Totals $ 940,765 $ 8,764 $ (2,674 ) $ 946,855 Debt Securities Held-to-Maturity Mortgage-backed securities of U.S. government sponsored entities $ 261,369 $ 2,717 $ (1,873 ) $ 262,213 Totals $ 261,369 $ 2,717 $ (1,873 ) $ 262,213 December 31, 2018 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt Securities Available-for-Sale U.S. Treasury securities and obligations of U.S. government agencies $ 7,200 $ 106 $ (6 ) $ 7,300 Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities 567,753 300 (14,047 ) 554,006 Private mortgage-backed securities and collateralized mortgage obligations 55,569 560 (401 ) 55,728 Collateralized loan obligations 212,807 1 (3,442 ) 209,366 Obligations of state and political subdivisions 39,543 339 (451 ) 39,431 Totals $ 882,872 $ 1,306 $ (18,347 ) $ 865,831 Debt Securities Held-to-Maturity Mortgage-backed securities of U.S. government sponsored entities $ 304,423 $ — $ (7,324 ) $ 297,099 Private mortgage-backed securities and collateralized mortgage obligations 21,526 277 (130 ) 21,673 Collateralized loan obligations 32,000 — (877 ) 31,123 Totals $ 357,949 $ 277 $ (8,331 ) $ 349,895 Proceeds from sales of debt securities during 2019 were $202.7 million , with gross gains of $2.9 million and gross losses of $1.8 million . Proceeds from sales of debt securities during 2018 were $64.4 million with gross gains of $0.2 million and gross losses of $0.7 million . Proceeds from sales of debt securities during 2017 were $235.6 million with gross gains of $1.6 million and gross losses of $1.5 million . Included in "Securities gains (losses) net" is an increase of $0.2 million and a decrease of $0.1 million , respectively, in the value of an investment in shares of a mutual fund that invests in CRA-qualified debt securities in 2019 and 2018 . At December 31, 2019 , debt securities with a fair value of $133.4 million were pledged as collateral for United States Treasury deposits, other public deposits and trust deposits. Debt securities with a fair value of $94.4 million were pledged as collateral for repurchase agreements. The amortized cost and fair value of securities at December 31, 2019 , by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because prepayments of the underlying collateral for these securities may occur, due to the right to call or repay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately. Held-to-Maturity Available-for-Sale (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in less than one year $ — $ — $ 3,472 $ 3,523 Due after one year through five years — — 8,582 8,698 Due after five years through ten years — — 10,488 10,979 Due after ten years — — 17,920 18,669 — — 40,462 41,869 Mortgage-backed securities of U.S. government sponsored entities 261,369 262,213 604,934 609,207 Private mortgage-backed securities and collateralized mortgage obligations — — 56,005 57,561 Collateralized loan obligations — — 239,364 238,218 Totals $ 261,369 $ 262,213 $ 940,765 $ 946,855 The estimated fair value of a security is determined based on market quotations when available or, if not available, by using quoted market prices for similar securities, pricing models or discounted cash flows analyses, using observable market data where available. The tables below indicate the fair value of debt securities with unrealized losses and the period of time for which these losses were outstanding at December 31, 2019 and December 31, 2018 , respectively. December 31, 2019 Less than 12 months 12 months or longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities and obligations of U.S. government agencies $ 758 $ (4 ) $ — $ — $ 758 $ (4 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities 220,057 (1,461 ) 104,184 (1,923 ) 324,241 (3,384 ) Private mortgage-backed securities and collateralized mortgage obligations 2,978 (5 ) — — 2,978 (5 ) Collateralized loan obligations 88,680 (570 ) 110,767 (583 ) 199,447 (1,153 ) Obligations of state and political subdivisions 515 (1 ) — — 515 (1 ) Total temporarily impaired securities $ 312,988 $ (2,041 ) $ 214,951 $ (2,506 ) $ 527,939 $ (4,547 ) December 31, 2018 Less than 12 months 12 months or longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities and obligations of U.S. government agencies $ 99 $ (1 ) $ 642 $ (5 ) $ 741 $ (6 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities 200,184 (2,235 ) 623,420 (19,136 ) 823,604 (21,371 ) Private mortgage-backed securities and collateralized mortgage obligations 20,071 (344 ) 12,739 (187 ) 32,810 (531 ) Collateralized loan obligations 238,894 (4,319 ) — — 238,894 (4,319 ) Obligations of state and political subdivisions 19,175 (241 ) 9,553 (210 ) 28,728 (451 ) Total temporarily impaired securities $ 478,423 $ (7,140 ) $ 646,354 $ (19,538 ) $ 1,124,777 $ (26,678 ) At December 31, 2019 , the Company had $3.4 million of unrealized losses on mortgage backed securities and collateralized mortgage obligations of government sponsored entities having a fair value of $324.2 million that were attributable to a combination of factors, including relative changes in interest rates since the time of purchase. The contractual cash flows for these securities are guaranteed by U.S. government agencies and U.S. government sponsored entities. Based on the assessment of these mitigating factors, management believes that the unrealized losses on these debt security holdings are a function of changes in investment spreads and interest rate movements and not changes in credit quality. Management expects to recover the entire amortized cost basis of these securities. At December 31, 2019 , the Company had unrealized losses of $1.2 million on collateralized loan obligations with a fair value of $199.4 million . The collateral for these securities is first lien senior secured corporate debt. The Company holds senior tranches rated credit A or higher. Management expects to recover the entire amortized cost basis of these securities. At December 31, 2019 , the Company does not intend to sell debt securities that are in an unrealized loss position and it is not more than likely than not that the Company will be required to sell these securities before recovery of the amortized cost basis. Therefore, management does not consider any investment to be other than temporarily impaired at December 31, 2019 . Included in other assets at December 31, 2019 is $44.3 million of Federal Home Loan Bank and Federal Reserve Bank stock stated at par value. The Company has not identified events or changes in circumstances which may have a significant adverse effect on the fair value of these cost method investment securities. Also included in other assets is a $6.4 million investment in a mutual fund carried at fair value. The Company holds 11,330 shares of Visa Class B stock, which following resolution of Visa litigation will be converted to Visa Class A shares. Under the current conversion ratio that became effective September 27, 2019 , the Company would receive 1.6228 shares of Class A stock for each share of Class B stock for a total of 18,386

Loans

Loans	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Loans	Loans The Company accounts for a loan depending on the strategy for the loan and on the credit impaired status of the loan upon acquisition. Loans are accounted for using the following categories: • Loans and leases held for sale • Loans and leases originated by the Company and held for investment • Loans and leases purchased by the Company, which are considered purchased unimpaired (“PUL”), and held for investment • Loans and leases purchased by the Company, which are considered purchased credit impaired (“PCI”) Refer to Note A for further discussion on how the categories above are defined. Loans are also categorized based on the customer and use type of the credit extended. The following outlines the categories used: • Construction and Land Development Loans: The Company defines construction and land development loans as exposures secured by land development and construction (including 1-4 family residential construction), multi-family property, and non-farm nonresidential property where the primary or significant source of repayment is from proceeds of the sale, refinancing, or permanent financing of the property. • Commercial Real Estate Loans: Commercial real estate loans are subject to underwriting standards and processes similar to commercial and industrial loans. These loans are viewed primarily as cash flow loans and the repayment of these loans is largely dependent on rental income from the successful operation of the property. Loan performance may be adversely affected by factors impacting the general economy or conditions specific to the real estate market such as geographic location and/or property type. • Residential Real Estate Loans: The Company selectively adds residential mortgage loans to its portfolio, primarily loans with adjustable rates, home equity mortgages and home equity lines. Substantially all residential originations have been underwritten to conventional loan agency standards, including loans having balances that exceed agency value limitations. • Commercial and Financial Loans: Commercial credit is extended primarily to small to medium sized professional firms, retail and wholesale operators and light industrial and manufacturing concerns. Such credits typically comprise working capital loans, loans for physical asset expansion, asset acquisition and other business loans. Loans to closely held businesses will generally be guaranteed in full or for a meaningful amount by the businesses’ major owners. Commercial loans are based primarily on the historical and projected cash flow of the borrower and secondarily on the capacity of credit enhancements, guarantees and underlying collateral provided by the borrower. The cash flows of borrowers, however, may not behave as forecasted and collateral securing loans may fluctuate in value due to economic or individual performance factors. Minimum standards and underwriting guidelines have been established for all commercial loan types. • Consumer Loans: The Company originates consumer loans including installment loans and revolving lines, loans for automobiles, boats, and other personal, family and household purposes. For each loan type several factors including debt to income, type of collateral and loan to collateral value, credit history and Company relationship with the borrower are considered during the underwriting process. The following table outlines net loans balances by category as of: December 31, 2019 (In thousands) Portfolio Loans PCI Loans PULs Total Loans Construction and land development $ 281,335 $ 160 $ 43,618 $ 325,113 Commercial real estate 1,834,811 10,217 533,943 2,378,971 Residential real estate 1,304,305 1,710 201,848 1,507,863 Commercial and financial 697,301 579 80,372 778,252 Consumer 200,166 — 8,039 208,205 Total Loans 1 $ 4,317,918 $ 12,666 $ 867,820 $ 5,198,404 December 31, 2018 (In thousands) Portfolio Loans PCI Loans PULs Total Loans Construction and land development $ 301,473 $ 151 $ 141,944 $ 443,568 Commercial real estate 1,437,989 10,828 683,249 2,132,066 Residential real estate 1,055,525 2,718 266,134 1,324,377 Commercial and financial 603,057 737 118,528 722,322 Consumer 190,207 — 12,674 202,881 Total Loans 1 $ 3,588,251 $ 14,434 $ 1,222,529 $ 4,825,214 1 Loan balances at December 31, 2019 and 2018 include deferred costs of $19.9 million and $16.9 million, respectively. Loan accrual status is a primary qualitative credit factor monitored by the Company’s Credit Risk Management when determining the allowance for loan and lease losses. As a loan remains delinquent, the likelihood increases that a borrower is either unable or unwilling to repay. Loans are moved to nonaccrual status when they become 90 days past due, have been evaluated for impairment and have been deemed impaired. The following table presents the balances outstanding status by class of loans as of: December 31, 2019 Accruing 30-59 Days Accruing 60-89 Days Accruing Greater Than Total Financing (In thousands) Current Past Due Past Due 90 Days Nonaccrual Receivables Portfolio Loans Construction and land development $ 276,984 $ — $ — $ — $ 4,351 $ 281,335 Commercial real estate 1,828,629 1,606 220 — 4,356 1,834,811 Residential real estate 1,294,778 1,564 18 — 7,945 1,304,305 Commercial and financial 690,412 2,553 — 108 4,228 697,301 Consumer 199,424 317 315 — 110 200,166 Total Portfolio Loans 4,290,227 6,040 553 108 20,990 4,317,918 PULs Construction and land development 43,044 — — — 574 43,618 Commercial real estate 531,325 942 431 — 1,245 533,943 Residential real estate 201,159 277 — — 412 201,848 Commercial and financial 78,705 — — — 1,667 80,372 Consumer 8,039 — — — — 8,039 Total PULs 862,272 1,219 431 — 3,898 867,820 PCI Loans Construction and land development 148 — — — 12 160 Commercial real estate 9,298 — — — 919 10,217 Residential real estate 587 — — — 1,123 1,710 Commercial and financial 566 — — — 13 579 Consumer — — — — — — Total PCI Loans 10,599 — — — 2,067 12,666 Total Loans $ 5,163,098 $ 7,259 $ 984 $ 108 $ 26,955 $ 5,198,404 December 31, 2018 Accruing 30-59 Days Accruing 60-89 Days Accruing Greater Than Total Financing (In thousands) Current Past Due Past Due 90 Days Nonaccrual Receivables Portfolio Loans Construction and land development $ 301,348 $ 97 $ — $ — $ 28 $ 301,473 Commercial real estate 1,427,413 3,852 97 141 6,486 1,437,989 Residential real estate 1,044,375 2,524 525 295 7,806 1,055,525 Commercial and financial 594,930 5,186 1,661 — 1,280 603,057 Consumer 189,061 637 326 — 183 190,207 Total Portfolio Loans 3,557,127 12,296 2,609 436 15,783 3,588,251 PULs Construction and land development 140,013 1,931 — — — 141,944 Commercial real estate 680,060 1,846 — — 1,343 683,249 Residential real estate 260,781 1,523 — 90 3,740 266,134 Commercial and financial 116,173 342 — — 2,013 118,528 Consumer 12,643 — 31 — — 12,674 Total PULs 1,209,670 5,642 31 90 7,096 1,222,529 PCI Loans Construction and land development 135 — — — 16 151 Commercial real estate 8,403 1,034 — — 1,391 10,828 Residential real estate 556 — — — 2,162 2,718 Commercial and financial 74 635 — — 28 737 Consumer — — — — — — Total PCI Loans 9,168 1,669 — — 3,597 14,434 Total Loans $ 4,775,965 $ 19,607 $ 2,640 $ 526 $ 26,476 $ 4,825,214 The reduction in interest income associated with loans on nonaccrual status was approximately $0.4 million , $1.0 million , and $0.7 million , for the years ended December 31, 2019 , 2018 , and 2017 , respectively. The Company’s Credit Risk Management also utilizes an internal asset classification system as a means of identifying problem and potential problem loans. The following classifications are used to categorize loans under the internal classification system: • Pass: Loans that are not problems or potential problem loans are considered to be pass-rated. • Special Mention: Loans that do not currently expose the Company to sufficient risk to warrant classification in the Substandard or Doubtful categories, but possess weaknesses that deserve management’s close attention are deemed to be Special Mention. • Substandard: Loans with the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. • Doubtful: Loans that have all the weaknesses inherent in those classified Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The principal balance of loans classified as doubtful are likely to be charged off. Risk ratings on commercial lending facilities are re-evaluated during the annual review process at a minimum, based on the size of the aggregate exposure, and/or when there is a credit action of the existing credit exposure. The following tables present the risk category of loans by class of loans based on the most recent analysis performed as of: December 31, 2019 (In thousands) Pass Special Mention Substandard Doubtful Total Net Loans Construction and land development $ 317,765 $ 2,235 $ 5,113 $ — $ 325,113 Commercial real estate 2,331,725 26,827 20,098 321 2,378,971 Residential real estate 1,482,278 7,364 18,221 — 1,507,863 Commercial and financial 755,957 11,925 9,496 874 778,252 Consumer 203,966 3,209 1,030 — 208,205 Total Net Loans $ 5,091,691 $ 51,560 $ 53,958 $ 1,195 $ 5,198,404 December 31, 2018 (In thousands) Pass Special Mention Substandard Doubtful Total Net Loans Construction and land development $ 428,044 $ 10,429 $ 5,095 $ — $ 443,568 Commercial real estate 2,063,589 41,429 27,048 — 2,132,066 Residential real estate 1,296,634 3,654 24,089 — 1,324,377 Commercial and financial 707,663 8,387 6,247 25 722,322 Consumer 198,367 3,397 1,117 — 202,881 Total Net Loans $ 4,694,297 $ 67,296 $ 63,596 $ 25 $ 4,825,214 Loans to directors and executive officers totaled $1.7 million and $0.9 million at December 31, 2019 and 2018 , respectively. No new loans were originated to directors or officers in 2019. Concentrations of Credit The Company's lending activity occurs primarily in Florida, with concentrations in the state's fastest growing markets including the Fort Lauderdale, Boca Raton, Palm Beach, Daytona, Orlando and Tampa markets. PCI Loans PCI loans are accounted for pursuant to ASC Topic 310-30. The excess of cash flows expected to be collected over the estimated fair value is referred to as the accretable yield and is recognized in interest income over the remaining life of the loan in situations where there is a reasonable expectation about the timing and amount of cash flows expected to be collected. The difference between the contractually required payments and the cash flows expected to be collected at acquisition, considering the impact of prepayments, is referred to as the nonaccretable difference. The table below summarizes the changes in accretable yield on PCI loans for the years ended: December 31, (In thousands) 2019 2018 2017 Beginning balance $ 2,924 $ 3,699 $ 3,807 Additions — — 763 Deletions — (43 ) (11 ) Accretion (1,778 ) (1,291 ) (1,647 ) Reclassifications from non-accretable difference 703 559 787 Ending Balance $ 1,849 $ 2,924 $ 3,699 See Note S for information related to loans purchased in transactions accounted for as business combinations during the periods presented. Troubled Debt Restructured Loans The Company’s Troubled Debt Restructuring (“TDR”) concessions granted to certain borrowers generally do not include forgiveness of principal balances, but may include interest rate reductions, an extension of the amortization period and/or converting the loan to interest only for a limited period of time. Loan modifications are not reported in calendar years after modification if the loans were modified at an interest rate equal to the yields of new loan originations with comparable risk and the loans are performing based on the terms of the restructured agreements. Most loans prior to modification were classified as impaired and the allowance for loan losses is determined in accordance with Company policy. During the twelve months ended December 31, 2019 , there were nine loans totaling $4.7 million modified in a TDR. There were four defaults totaling $3.2 million of loans modified in TDRs within the twelve months preceding December 31, 2019 . During the twelve months ended December 31, 2018 , there were four loans totaling $0.2 million modified in a TDR and there were no payment defaults on loans that had been modified to a TDR within the previous twelve months. During the twelve months ended December 31, 2017 , there was one loan totaling $0.1 million modified in a TDR and there were no payment defaults on loans that had been modified to a TDR within the previous twelve months. The Company considers a loan to have defaulted when it becomes 90 days or more delinquent under the modified terms, has been transferred to nonaccrual status, or has been transferred to other real estate owned. A defaulted TDR is generally placed on nonaccrual and a specific allowance for loan loss is assigned in accordance with the Company’s policy. Impaired Loans Loans are considered impaired if they are 90 days or more past due, in nonaccrual status, or are TDRs. As of December 31, 2019 and 2018 , the Company’s recorded investment in impaired loans, excluding PCI loans, and related valuation allowance was as follows: December 31, 2019 Recorded Unpaid Principal Related Valuation (In thousands) Investment Balance Allowance Impaired Loans with No Related Allowance Recorded: Construction and land development $ 4,995 $ 5,186 $ — Commercial real estate 6,070 7,590 — Residential real estate 9,470 14,182 — Commercial and financial 3,485 4,475 — Consumer 111 125 — Impaired Loans with an Allowance Recorded: Construction and land development 62 78 14 Commercial real estate 4,196 4,196 220 Residential real estate 4,914 4,914 834 Commercial and financial 2,567 3,115 1,731 Consumer 226 239 59 Total Impaired Loans Construction and land development 5,057 5,264 14 Commercial real estate 10,266 11,786 220 Residential real estate 14,384 19,096 834 Commercial and financial 6,052 7,590 1,731 Consumer 337 364 59 Total Impaired Loans $ 36,096 $ 44,100 $ 2,858 December 31, 2018 Recorded Unpaid Principal Related Valuation (In thousands) Investment Balance Allowance Impaired Loans with No Related Allowance Recorded: Construction and land development $ 15 $ 229 $ — Commercial real estate 3,852 5,138 — Residential real estate 13,510 18,111 — Commercial and financial 1,191 1,414 — Consumer 280 291 — Impaired Loans with an Allowance Recorded: Construction and land development 196 211 22 Commercial real estate 9,786 12,967 369 Residential real estate 5,537 5,664 805 Commercial and financial 2,131 2,309 1,498 Consumer 202 211 34 Total Impaired Loans Construction and land development 211 440 22 Commercial real estate 13,638 18,105 369 Residential real estate 19,047 23,775 805 Commercial and financial 3,322 3,723 1,498 Consumer 482 502 34 Total Impaired Loans $ 36,700 $ 46,545 $ 2,728 Impaired loans also include TDRs where concessions have been granted to borrowers who have experienced financial difficulty. At December 31, 2019 and 2018 , accruing TDRs totaled $11.1 million and $13.3 million , respectively. Average impaired loans for the years ended December 31, 2019 , 2018 , and 2017 were $35.6 million , $35.3 million , and $30.9 million , respectively. The impaired loans were measured for impairment based on the value of underlying collateral or the present value of expected future cash flows discounted at the loan’s effective interest rate. The valuation allowance is included in the allowance for loan losses. Interest payments received on impaired loans are recorded as interest income unless collection of the remaining recorded investment is doubtful, at which time payments received are recorded as reductions in principal. For the years ended December 31, 2019 , 2018 and 2017 , the Company recorded $2.0 million , $2.0 million , and $1.5 million , respectively, in interest income on impaired loans. For impaired loans whose impairment is measured based on the present value of expected future cash flows, a total of $0.1 million , $0.2 million and $0.3 million , respectively, for 2019 , 2018 , and 2017 was included in interest income and represents the change in present value attributable to the passage of time.

Allowance for Loan Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Allowance for Loan Losses	Allowance for Loan Losses Activity in the allowance for loans losses for the three years ended December 31, 2019 , 2018 and 2017 is summarized as follows: (In thousands) Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance December 31, 2019 Construction and land development $ 2,233 $ (421 ) $ — $ 31 $ (1 ) $ 1,842 Commercial real estate 11,112 1,677 (248 ) 744 (61 ) 13,224 Residential real estate 7,775 (231 ) (152 ) 338 (63 ) 7,667 Commercial and financial 8,585 7,969 (7,550 ) 712 — 9,716 Consumer 2,718 2,005 (2,609 ) 595 (4 ) 2,705 Total $ 32,423 $ 10,999 $ (10,559 ) $ 2,420 $ (129 ) $ 35,154 December 31, 2018 Construction and land development $ 1,642 $ 564 $ — $ 27 $ — $ 2,233 Commercial real estate 9,285 4,736 (3,139 ) 292 (62 ) 11,112 Residential real estate 7,131 29 (80 ) 816 (121 ) 7,775 Commercial and financial 7,297 4,359 (3,396 ) 325 — 8,585 Consumer 1,767 2,042 (1,411 ) 329 (9 ) 2,718 Total $ 27,122 $ 11,730 $ (8,026 ) $ 1,789 $ (192 ) $ 32,423 December 31, 2017 Construction and land development $ 1,219 $ (471 ) $ — $ 896 $ (2 ) $ 1,642 Commercial real estate 9,273 (264 ) (407 ) 747 (64 ) 9,285 Residential real estate 7,483 125 (569 ) 336 (244 ) 7,131 Commercial and financial 3,636 5,304 (1,869 ) 226 — 7,297 Consumer 1,789 954 (1,257 ) 290 (9 ) 1,767 Total $ 23,400 $ 5,648 $ (4,102 ) $ 2,495 $ (319 ) $ 27,122 As discussed in Note A, "Significant Accounting Policies," the allowance for loan losses is comprised of specific allowances for certain impaired loans and general allowances grouped into loan pools based on similar characteristics. The Company's loan portfolio (excluding PCI loans) and related allowance at December 31, 2019 and 2018 is shown in the following tables. December 31, 2019 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction and land development $ 5,057 $ 14 $ 319,896 $ 1,828 $ 324,953 $ 1,842 Commercial real estate 10,267 220 2,358,487 13,004 2,368,754 13,224 Residential real estate 14,383 834 1,491,770 6,833 1,506,153 7,667 Commercial and financial 6,052 1,731 771,621 7,985 777,673 9,716 Consumer 337 59 207,868 2,646 208,205 2,705 Total $ 36,096 $ 2,858 $ 5,149,642 $ 32,296 $ 5,185,738 $ 35,154 December 31, 2018 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction and land development $ 211 $ 22 $ 443,206 $ 2,211 $ 443,417 $ 2,233 Commercial real estate 13,638 369 2,107,600 10,743 2,121,238 11,112 Residential real estate 19,047 805 1,302,612 6,970 1,321,659 7,775 Commercial and financial 3,322 1,498 718,263 7,087 721,585 8,585 Consumer 482 34 202,399 2,684 202,881 2,718 Total $ 36,700 $ 2,728 $ 4,774,080 $ 29,695 $ 4,810,780 $ 32,423 Loans collectively evaluated for impairment reported at December 31, 2019 included acquired loans that are not PCI loans. At December 31, 2019 , the remaining fair value adjustments for loans acquired was $33.3 million , or 3.84% of the outstanding aggregate PUL balances. At December 31, 2018 , the remaining fair value adjustments for loans acquired was $47.0 million , or 3.86% of the outstanding aggregate PUL balances. These amounts, which represent the remaining fair value discount of each PUL, are accreted into interest income over the remaining lives of the related loans on a level yield basis. Provisions for loan losses of $0.7 million and net charge-offs of $0.7 million were recorded for these loans during 2019 . Recapture of $0.2 million and net recoveries of $0.1 million were recorded during 2018 and 2017 , respectively. The table below summarizes PCI loans that were individually evaluated for impairment based on expected cash flows at December 31, 2019 and 2018 . December 31, 2019 December 31, 2018 PCI Loans Individually Evaluated for Impairment PCI Loans Individually Evaluated for Impairment (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction and land development $ 160 $ — $ 151 $ — Commercial real estate 10,217 — 10,828 — Residential real estate 1,710 — 2,718 — Commercial and financial 579 — 737 — Consumer — — — — Total $ 12,666 $ — $ 14,434 $ —

Bank Premises and Equipment

Bank Premises and Equipment	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Bank Premises and Equipment	Bank Premises and Equipment Bank premises and equipment as of: (In thousands) Cost Accumulated Depreciation & Amortization Net Carrying Value December 31, 2019 Premises (including land of $18,546) $ 83,020 $ (26,180 ) $ 56,840 Furniture and equipment 37,364 (27,589 ) 9,775 Total $ 120,384 $ (53,769 ) $ 66,615 December 31, 2018 Premises (including land of $18,546) $ 85,027 $ (26,107 ) $ 58,920 Furniture and equipment 36,892 (24,788 ) 12,104 Total $ 121,919 $ (50,895 ) $ 71,024

Goodwill and Acquired Intangibl

Goodwill and Acquired Intangible Assets	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Acquired Intangible Assets	Goodwill and Acquired Intangible Assets The following table presents changes in the carrying amount of goodwill: For the Year Ended December 31, (In thousands) 2019 2018 2017 Beginning of year $ 204,753 $ 147,578 $ 64,649 Changes from business combinations 533 57,175 82,929 Total $ 205,286 $ 204,753 $ 147,578 The Company performs an analysis for goodwill impairment on an annual basis. Based on the analysis performed in the fourth quarter, the Company has concluded goodwill was not impaired as of December 31, 2019 and 2018 . Acquired intangible assets consist of core deposit intangibles ("CDI"), which are intangible assets arising from the purchase of deposits separately or from bank acquisitions. The change in balance for CDI is as follows: For the Year Ended December 31, (In thousands) 2019 2018 2017 Beginning of year $ 24,807 $ 18,937 $ 14,572 Acquired CDI, including measurement period adjustments (676 ) 10,170 7,726 Amortization expense (5,826 ) (4,300 ) (3,361 ) End of year $ 18,305 $ 24,807 $ 18,937 (In months) Remaining average amortization period for CDI 47 58 63 The gross carrying amount and accumulated amortization of the Company's CDI subject to amortization as of: December 31, 2019 December 31, 2018 (In thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Deposit base $ 36,015 $ (17,710 ) $ 36,691 $ (11,884 ) The annual amortization expense for the Company's CDI determined using the straight line method for each of the five years subsequent to December 31, 2019 is $5.7 million , $4.5 million , $4.0 million , $3.3 million and $0.6 million , respectively. Mortgage servicing rights ("MSRs") retained from the sale of Small Business Administration ("SBA") guarantees totaled $1.8 million and $1.1 million at December 31, 2019 and 2018 , respectively.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Borrowings	Borrowings A significant portion of the Company's short-term borrowings were comprised of securities sold under agreements to repurchase with overnight maturities : For the Year Ended December 31, (In thousands) 2019 2018 2017 Maximum amount outstanding at any month end $ 193,388 $ 341,213 $ 216,094 Weighted average interest rate at end of year 1.17 % 1.14 % 0.71 % Average amount outstanding $ 106,142 $ 200,839 $ 171,686 Weighted average interest rate during the year 1.35 % 0.90 % 0.46 % Securities sold under agreements to repurchase are accounted for as secured borrowings. For securities sold under agreements to repurchase, the Company would be obligated to provide additional collateral in the event of a significant decline in fair value of collateral pledged. Company securities pledged were as follows by collateral type and maturity as of: December 31, (In thousands) 2019 2018 2017 Fair value of pledged securities - overnight and continuous: Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities $ 94,354 $ 246,829 $ 248,654 At December 31, 2019 , Seacoast Bank had secured lines of credit of $2.1 billion , of which $315 million was outstanding from the Federal Home Loan Bank ("FHLB"). During 2019 , the average interest rate on short-term borrowings was 2.28% and the weighted average interest rate on balances outstanding at December 31, 2019 was 1.72% . The following table summarizes the Company's junior subordinated debentures and related trust preferred and common equity securities as of December 31, 2019 : (In thousands) Description Issuance Date Acquisition Date 1 Maturity Date Junior Subordinated Debt Trust Preferred Securities Common Equity Securities Contractual Interest Rate Interest Rate at December 31, 2019 SBCF Capital Trust I 3/31/2005 n/a 3/31/2035 $ 20,619 $ 20,000 $ 619 3 month LIBOR +175bps 3.69% SBCF Statutory Trust II 12/16/2005 n/a 12/16/2035 20,619 20,000 619 3 month LIBOR +133bps 3.22% SBCF Statutory Trust III 6/29/2007 n/a 6/15/2037 12,372 12,000 372 3 month LIBOR +135bps 3.24% BANKshares, Inc. Statutory Trust I 12/19/2002 10/1/2014 12/26/2032 5,155 5,000 155 3 month LIBOR +325bps 5.20% BANKshares, Inc. Statutory Trust II 3/17/2004 10/1/2014 3/17/2034 4,124 4,000 124 3 month LIBOR +279bps 4.69% BANKshares, Inc. Capital Trust I 12/15/2005 10/1/2014 12/15/2035 5,155 5,000 155 3 month LIBOR +139bps 3.30% Grand Bank Capital Trust I 10/29/2004 7/17/2015 10/29/2034 7,217 7,000 217 3 month LIBOR +198bps 3.94% $ 75,261 $ 73,000 $ 2,261 1 Acquired junior subordinated debentures were recorded at their acquisition date fair values, which collectively was $5.6 million lower than face value; this amount is being amortized into interest expense over the remaining term to maturity. Interest on the trust preferred securities is calculated on the basis of 3-month LIBOR plus spread and is re-set quarterly. The trust preferred securities may be redeemed without penalty, upon approval of the Federal Reserve or upon occurrence of certain events affecting their tax or regulatory capital treatment. Distributions on the trust preferred securities are payable quarterly in March, June, September, and December of each year. The proceeds of the offering of trust preferred securities and common equity securities were used by SBCF Capital Trust I and SBCF Statutory Trust II to purchase the $41.2 million junior subordinated deferrable interest notes issued by the Company, and by SBCF Statutory Trust III to purchase the $12.4 million junior subordinated deferrable interest notes issued by the Company, all of which have terms substantially similar to the trust preferred securities. The Company has the right to defer payments of interest on the notes at any time or from time to time at the Company's election. Interest can be deferred for a period not longer than five years. If the Company elects to defer interest, it may not, with certain exceptions, declare or pay any dividends or distributions on its capital stock or purchase or acquire any of its capital stock. As of December 31, 2019 , 2018 and 2017 , all interest payments on trust preferred securities were current. The Company has entered into agreements to guarantee the payments of distributions on the trust preferred securities and payments of redemption of the trust preferred securities. Under these agreements, the Company also agrees, on a subordinated basis, to pay expenses and liabilities of the Trusts other than those arising under the trust preferred securities. The obligations of the Company under the junior subordinated notes, the trust agreement establishing the Trusts, the guarantees and agreements as to expenses and liabilities, in aggregate, constitute a full and conditional guarantee by the Company of the Trusts' obligations under the trust preferred securities.

Employee Benefits and Stock Com

Employee Benefits and Stock Compensation	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Employee Benefits and Stock Compensation	Employee Benefits and Stock Compensation The Company’s defined contribution plan covers substantially all employees after one year of service and includes a matching benefit for employees who can elect to defer a portion of their compensation. In addition, amounts of compensation contributed by employees are matched on a percentage basis under the plan. The Company's contributions to this plan charged to operations were $2.4 million in 2019 , $2.1 million in 2018 , and $1.9 million in 2017 . The Company, through its Compensation and Governance Committee of the board of directors (the “Compensation Committee”), offers equity compensation to employees and non-employee directors of Seacoast and Seacoast Bank in the form of various share-based awards, including stock options, restricted stock awards (“RSAs”), or restricted stock units (“RSUs”). The awards may vest over time, have certain performance based criteria, or both. Stock options are granted with an exercise price at least equal to the market price of the Company’s stock at the date of grant. The fair value of options granted is estimated on the date of grant using the Black-Scholes option-pricing model. Compensation cost is amortized on a straight-line basis over the vesting period. Vesting is determined by the Compensation Committee at the time of grant, generally over five years . The options have a maximum term of ten years . The fair value of RSAs and RSUs are estimated based on the price of the Company’s common stock on the date of grant. Compensation cost is measured straight-line for RSAs and ratably for RSUs over the vesting period of the awards and reversed for awards which are forfeited due to unfulfilled service or performance criteria. To the extent the Company has treasury shares available, stock options exercised or stock grants awarded may be issued from treasury shares. If treasury shares are insufficient, the Company can issue new shares. Vesting of share-based awards is immediately accelerated on death or disability of the recipient. The Compensation Committee may, at its discretion, accelerate vesting upon retirement (including a voluntary termination of employment at age 55) for those employees with five or more years of service with the Company, or upon the event of a change-in-control. Awards are currently granted under the Seacoast 2013 Incentive Plan (“2013 Plan”), which shareholders approved on May 23, 2013 and has been twice amended to increase the number of authorized shares for issuance thereunder to 4,250,000 . The 2013 Plan expires on May 26, 2025. Approximately 1,057,000 shares remain available for issuance as of December 31, 2019 . The impact of share-based compensation on the Company’s financial results is presented below: For the Year Ended December 31, (In thousands) 2019 2018 2017 Share-based compensation expense $ 7,244 $ 7,823 5,267 Income tax benefit (1,723 ) (1,911 ) (1,966 ) The total unrecognized compensation cost and the weighted-average period over which unrecognized compensation cost is expected to be recognized related to non-vested share-based compensation arrangements at December 31, 2019 is presented below: (In thousands) Unrecognized Compensation Cost Weighted-Average Period Remaining (Years) Restricted stock awards $ 3,577 1.6 Restricted stock units 3,921 1.7 Stock options 697 0.9 Total $ 8,195 1.6 Restricted Stock Awards RSAs are granted to various employees and vest over time, generally three years . Compensation cost of RSAs is based on the market value of the Company’s common stock at the date of grant and is recognized over the required service period on a straight-line basis. The Company’s accounting policy is to recognize forfeitures as they occur. A summary of the status of the Company’s non-vested RSAs as of December 31, 2019 , and changes during the year then ended, is presented below: Restricted Award Shares Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2019 295,130 $ 24.09 Granted 157,861 26.86 Forfeited/Canceled (63,666 ) 25.83 Vested (175,374 ) 23.54 Non-vested at December 31, 2019 213,951 26.07 Information regarding restricted stock awards during each of the following years is presented below: Year Ended December 31, 2019 2018 2017 Shares granted 157,861 242,613 114,331 Weighted-average grant date fair value $ 26.86 $ 26.48 $ 24.08 Fair value of awards vested 1 $ 4,128 $ 2,515 $ 1,407 1 Based on grant date fair value, in thousands Restricted Stock Units RSUs granted in 2019 allow the grantee to earn 0% - 225% while RSUs granted in 2018 and 2017 allow the grantee to earn 0% - 200% of the target award all based on the Company's adjusted earnings per share growth or its adjusted return on average tangible equity, each measured over a three year period beginning with the year of grant. Certain RSUs granted in 2016 allow the grantee to earn 0% - 200% of the target award as determined by both the Company's adjusted net income and its adjusted return on tangible equity. The 2016 awards measure performance through December 31, 2019. A summary of the status of the Company’s non-vested RSUs as of December 31, 2019 , and changes during the year then ended, is presented below: Restricted Award Shares Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2019 503,111 $ 19.69 Granted 75,002 30.02 Forfeited/Canceled (8,242 ) 20.29 Vested (187,941 ) 15.24 Non-vested at December 31, 2019 381,930 23.89 Information regarding restricted stock units during each of the following years: For the Year Ended December 31, 2019 2018 2017 Shares granted 75,002 173,193 164,268 Weighted-average grant date fair value $ 30.02 $ 24.02 $ 23.94 Fair value of awards vested 1 $ 2,864 $ 1,095 $ 937 1 Based on grant date fair value Stock Options The Company estimated the fair value of each option grant on the date of grant using the Black-Scholes options-pricing model with the following weighted-average assumptions: For the Year Ended December 31, 2019 2018 2017 Risk-free interest rates 2.53 % 2.56 % 1.85 % Expected dividend yield — % — % — % Expected volatility 34.5 % 26.6 % 25.4 % Expected lives (years) 5.0 5.0 5.0 A summary of the Company’s stock options as of December 31, 2019 , and changes during the year then ended, are presented below: Options Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (000s) Outstanding at January 1, 2019 933,495 $ 22.00 Granted 3,438 28.42 Exercised (28,824 ) 14.86 Forfeited (4,330 ) 29.17 Outstanding at December 31, 2019 903,779 22.22 6.14 $ 7,669 Exercisable at December 31, 2019 633,561 19.82 5.65 6,848 Information related to stock options during each of the following years: For the Year Ended December 31, 2019 2018 2017 Options granted 3,438 219,118 297,576 Weighted-average grant date fair value $ 28.42 $ 5.65 $ 4.66 Intrinsic value of stock options exercised 277 3,045 1,143 The following table summarizes information related to stock options as of December 31, 2019 : Range of Exercise Prices Options Outstanding Remaining Contractual Life (Years) Options Exercisable Weighted Average Exercise Price $10.54 to $14.82 368,611 4.2 334,016 $ 12.42 $15.99 to $28.69 326,909 7.1 229,824 27.16 $31.15 to $31.15 208,259 8.2 69,721 31.15 Total 903,779 6.1 633,561 $ 19.82 Employee Stock Purchase Plan Under the Employee Stock Purchase Plan (“ESPP”), as amended, was approved by shareholders on April 25, 1989, and additional shares were authorized for issuance by shareholders on June 18, 2009 and May 2, 2013. Under the ESPP, the Company is authorized to issue up to 300,000 common shares of the Company’s common stock to eligible employees of the Company. These shares may be purchased by employees at a price equal to 95% of the fair market value of the shares on the purchase date. Purchases under the ESPP are made monthly. Employee contributions to the ESPP are made through payroll deductions. 2019 2018 2017 ESPP shares purchased 16,320 15,225 12,434 Weighted-average employee purchase price $ 25.39 $ 26.85 $ 22.67

Lease Commitments

Lease Commitments	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Lease Commitments	Lease Commitments The Company is the lessee in various noncancellable operating leases for land, buildings, and equipment. Certain leases contain provisions for variable lease payments that are linked to the consumer price index. Lease cost for the year ended December 31, 2019 consists of: (In thousands) For the Year Ended December 31, 2019 Operating lease cost $ 5,570 Variable lease cost 1,211 Short-term lease cost 715 Sublease income (618 ) Total lease cost $ 6,878 The following table provides supplemental information related to leases as of and for the year ended December 31, 2019 : (In thousands, except for weighted average data) December 31, 2019 Operating lease right-of-use assets $ 26,165 Operating lease liabilities 30,098 Cash paid for amounts included in the measurement of operating lease liabilities 5,936 Right-of-use assets obtained in exchange for new operating lease obligations 1,224 Weighted average remaining lease term for operating leases 8.5 years Weighted average discount rate for operating leases 4.70 % The Company’s lease agreements often include one or more options to renew at the Company’s discretion. If, at lease inception, the Company considers the exercising of a renewal option to be reasonably certain, the Company includes the extended term in the calculation of the lease liability. Maturities of lease liabilities as of December 31, 2019 are as follows: For the Year Ended December 31, 2019 (In thousands) 2020 $ 5,626 2021 4,965 2022 4,436 2023 3,725 2024 3,734 Thereafter 14,498 Total undiscounted cash flows 36,984 Less: Net present value adjustment (6,886 ) Total $ 30,098

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes is as follows: For the Year Ended December 31, (In thousands) 2019 2018 2017 Current Federal $ 20,954 $ 9,078 $ 667 State 1,932 — 2 Deferred Federal 2,808 7,018 32,791 State 4,179 4,163 2,876 $ 29,873 $ 20,259 $ 36,336 The difference between the total expected tax expense (computed by applying the U.S. Federal tax rate of 21% to pretax income in 2019 and 2018 and 35% in 2017 ) and the reported income tax provision relating to income before income taxes is as follows: For the Year Ended December 31, (In thousands) 2019 2018 2017 Tax rate applied to income before income taxes $ 27,008 $ 18,381 $ 27,720 Increase (decrease) resulting from the effects of: Tax law change — — 8,552 Nondeductible acquisition costs 125 207 657 Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance (1,282 ) (667 ) (1,445 ) State income taxes (1,283 ) (874 ) (1,007 ) Tax credit investments (72 ) (33 ) (165 ) Stock compensation (698 ) (918 ) (1,027 ) Other (36 ) — 173 Federal tax provision 23,762 16,096 33,458 State tax provision 6,111 4,163 2,878 Total income tax provision $ 29,873 $ 20,259 $ 36,336 The net deferred tax assets (liabilities) are comprised of the following as of: December 31, (In thousands) 2019 2018 Allowance for loan losses $ 8,949 $ 8,592 Premises and equipment — 1,670 Other real estate owned 8 207 Accrued stock compensation 2,406 2,547 Federal tax loss carryforward 3,601 4,699 State tax loss carryforward 1,110 2,912 Alternative minimum tax credit carryforward 530 — Lease liabilities 7,381 — Net unrealized securities losses — 4,658 Deferred compensation 2,458 2,287 Accrued interest and fee income 3,106 7,674 Other 378 1,627 Gross deferred tax assets 29,927 36,873 Less: Valuation allowance — — Deferred tax assets net of valuation allowance 29,927 36,873 Core deposit base intangible (4,005 ) (5,706 ) Net unrealized securities gains (1,210 ) — Premises and equipment (114 ) — Right of use assets (6,416 ) — Other (1,725 ) (2,213 ) Gross deferred tax liabilities (13,470 ) (7,919 ) Net deferred tax assets $ 16,457 $ 28,954 Included in the table above is the effect of temporary differences associated with the Company's investments in debt securities accounted for under ASC Topic 320, for which no deferred tax expense or benefit was recognized. These items are recorded as Accumulated Other Comprehensive Income in the shareholders' equity section of the consolidated balance sheet. In 2019 , unrealized gains of $5.7 million resulted in a deferred tax liability of $1.2 million . In 2018 , unrealized losses of $17.7 million resulted in a deferred tax asset of $4.7 million . At December 31, 2019 , the Company's net deferred tax assets ("DTAs") of $16.5 million consists of approximately $12.9 million of net U.S. federal DTAs and $3.5 million of net state DTAs. Management assesses the necessity of a valuation allowance recorded against DTAs at each reporting period. The determination of whether a valuation allowance for net DTAs is appropriate is subject to considerable judgment and requires an evaluation of all positive and negative evidence. Based on an assessment of all of the evidence, including favorable trending in asset quality and certainty regarding the amount of future taxable income that the Company forecasts, management concluded that it was more likely than not that its net DTAs will be realized based upon future taxable income. Management's confidence in the realization of projected future taxable income is based upon analysis of the Company's risk profile and its trending financial performance, including credit quality. The Company believes it can confidently and reasonably predict future results of operations that result in taxable income at sufficient levels over the future period of time that the Company has available to realize its net DTA. A valuation allowance could be required in future periods based on the assessment of positive and negative evidence. Management's conclusion at December 31, 2019 that it is more likely than not that the net DTAs of $16.5 million will be realized is based upon estimates of future taxable income that are supported by internal projections which consider historical performance, various internal estimates and assumptions, as well as certain external data, all of which management believes to be reasonable although inherently subject to judgment. If actual results differ significantly from the current estimates of future taxable income, even if caused by adverse macro-economic conditions, a valuation allowance may need to be recorded for some or all of the Company's DTAs. The establishment of a DTA valuation allowance could have a material adverse effect on the Company's financial condition and results of operations. Management expects to realize the $16.5 million in net DTAs well in advance of the statutory carryforward period. At December 31, 2019 , approximately $3.6 million of DTAs relate to federal net operating losses which will expire in annual installments beginning in 2029 through 2032. Additionally, $1.1 million of the DTAs relate to state net operating losses which will expire in annual installments beginning in 2029 through 2034. Remaining DTAs are not related to net operating losses or credits and therefore, have no expiration date. The Company recognizes interest and penalties, as appropriate, as part of the provisioning for income taxes. No interest or penalties were accrued at December 31, 2019 . In accordance with ASC Topic 718, Compensation – Stock Compensation, the Company recognized $0.8 million , $1.1 million and $1.1 million in 2019 , 2018 and 2017 , respectively, of discrete tax benefits related to share-based compensation. In accordance with ASC Topic 323, Investments-Equity Method and Joint Ventures, amortization of the Company's low-income housing credit investment of $0.9 million , $1.0 million and $0.7 million has been reflected as income tax expense for the years ended December 31, 2019 , 2018 and 2017 , respectively. The amount of affordable housing tax credits, amortization and tax benefits recorded as income tax expense for the year ended December 31, 2019 were $0.8 million , $0.9 million , and $0.2 million , respectively. The amount of affordable housing tax credits, amortization and tax benefits recorded as income tax expense for the year ended December 31, 2018 were $0.8 million , $1.0 million and $0.2 million , respectively. The amount of affordable housing tax credits, amortization and tax benefits recorded as income tax expense for the year ended December 31, 2017 were $0.6 million , $0.7 million and $0.3 million , respectively. The carrying value of the investment in affordable housing credits is $7.4 million and $8.3 million at December 31, 2019 and 2018 , respectively, of which $0.5 million and $3.2 million , respectively, is unfunded. The Company has no unrecognized income tax benefits or provisions due to uncertain income tax positions. The following are the major tax jurisdictions in which the Company operates and the earliest tax year, exclusive of the impact of the net operating loss carryforwards, subject to examination: Jurisdiction Tax Year United States of America 2016 Florida 2016 Enactment of the Tax Cuts and Jobs Act of 2017 ( the "Tax Reform Act") required the Company to revalue its existing net DTA based on the future federal corporate tax rate of 21%. The DTA revaluation resulted in a one-time charge to income tax expense in 2017 in the amount of $8.6 million . Upon the filing of the Company's 2017 income tax return, a $0.2 million tax benefit was recorded in 2018 to true-up the initial estimate. No further adjustments related to the Tax Reform Act are expected. In September 2019, the State of Florida announced a reduction in the corporate income tax rate from 5.5% to 4.458% for the years 2019, 2020 and 2021. This change resulted in additional income tax expense of $1.1 million upon the write down in the third quarter of 2019 of deferred tax assets affected by the change, offset by a $0.4 million benefit upon adjusting the year-to-date provision to the new statutory tax rate.

Noninterest Income and Expenses

Noninterest Income and Expenses	12 Months Ended
	Dec. 31, 2019
Brokers and Dealers [Abstract]
Noninterest Income and Expenses	Noninterest Income and Expenses Details of noninterest income and expense are as follows: For the Year Ended December 31, (In thousands) 2019 2018 2017 Noninterest Income Service charges on deposit accounts $ 11,529 $ 11,198 $ 10,049 Trust fees 4,443 4,183 3,705 Mortgage banking fees 6,490 4,682 6,449 Brokerage commissions and fees 1,909 1,732 1,352 Marine finance fees 1,054 1,398 910 Interchange income 13,399 12,335 10,583 BOLI income 3,674 4,291 3,426 SBA gains 2,472 2,474 579 Other 10,545 8,352 6,177 55,515 50,645 43,230 Gain on sale of Visa stock — — 15,153 Securities gains (losses), net 1,217 (623 ) 86 Total Noninterest Income $ 56,732 $ 50,022 $ 58,469 Noninterest Expenses Salaries and wages 73,829 71,111 65,692 Employee benefits 13,697 12,945 11,732 Outsourced data processing costs 15,077 16,374 14,116 Telephone and data lines 2,958 2,481 2,291 Occupancy 14,284 13,394 13,290 Furniture and equipment 6,245 6,744 6,067 Marketing 4,161 5,085 4,784 Legal and professional fees 8,553 9,961 11,022 FDIC assessments 881 2,195 2,326 Amortization of intangibles 5,826 4,300 3,361 Foreclosed property expense and net loss (gain) on sale 51 461 (300 ) Other 15,177 17,222 15,535 Total Noninterest Expenses $ 160,739 $ 162,273 $ 149,916

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Shareholders' Equity	Shareholders' Equity Required Regulatory Capital The Company is subject to various regulatory capital requirements administered by the Federal banking agencies. Failure to meet the minimum capital requirements can initiate certain mandatory and possible additional discretionary actions by the regulators, which could have a direct material impact on the financial statements. These requirements involve quantitative measures of assets, liabilities and certain off-balance sheet items calculated pursuant to regulatory guidance. The Company's capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Company to maintain minimum amounts and ratios of total, Tier 1 capital and common equity Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined) and of Tier 1 capital to average assets (as defined). At December 31, 2019 and 2018 , the Company and Seacoast Bank, its wholly-owned banking subsidiary, were both considered "well capitalized" based on the applicable U.S. regulatory capital ratio requirements as reflected in the table below: Minimum to meet "Well Capitalized" Requirements Minimum for Capital Adequacy Purpose 1 (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Seacoast Banking Corporation of Florida (Consolidated) At December 31, 2019: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 860,934 15.71 % n/a n/a $ 438,506 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 825,640 15.06 n/a n/a 328,880 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 754,555 13.77 n/a n/a 246,660 ≥ 4.50 Leverage Ratio (to adjusted average assets) 825,640 12.20 n/a n/a 270,788 ≥ 4.00 At December 31, 2018: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 744,687 14.43 % n/a n/a $ 412,754 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 712,144 13.80 n/a n/a 309,566 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 641,340 12.43 n/a n/a 232,174 ≥ 4.50 Leverage Ratio (to adjusted average assets) 712,144 11.16 n/a n/a 255,167 ≥ 4.00 Seacoast National Bank (A Wholly Owned Bank Subsidiary) At December 31, 2019: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 804,058 14.68 % $ 547,440 ≥ 10.00 % $ 437,952 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 768,764 14.04 437,952 ≥ 8.00 328,464 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 768,764 14.04 355,836 ≥ 6.50 246,348 ≥ 4.50 Leverage Ratio (to adjusted average assets) 768,764 11.38 337,787 ≥ 5.00 270,230 ≥ 4.00 At December 31, 2018: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 701,093 13.60 % $ 515,607 ≥ 10.00 % $ 412,486 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 668,550 12.97 412,486 ≥ 8.00 309,364 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 668,550 12.97 335,145 ≥ 6.50 232,023 ≥ 4.50 Leverage Ratio (to adjusted average assets) 668,550 10.49 318,795 ≥ 5.00 255,036 ≥ 4.00 1 Excludes the Basel III capital conservation buffer of 2.5% for 2019 and 1.875% for 2018, which if not exceeded may constrain dividends, equity repurchases and compensation. n/a - not applicable The Company has reserved 300,000 common shares for issuance in connection with an employee stock purchase plan and 1,000,000 common shares for issuance in connection with an employee profit sharing plan. Holders of common stock are entitled to one vote per share on all matters presented to shareholders as provided in the Company’s Articles of Incorporation. The Company implemented a dividend reinvestment plan during 2007, issuing no shares from treasury stock under this plan during 2019 or 2018 .

Seacoast Banking Corporation of

Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information	Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information Balance Sheets December 31, (In thousands) 2019 2018 Assets Cash $ 70 $ 197 Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days 52,979 40,130 Investment in subsidiaries 1,005,756 897,683 Other assets 1,515 777 $ 1,060,320 $ 938,787 Liabilities and Shareholders' Equity Subordinated debt $ 71,085 $ 70,804 Other liabilities 3,700 3,716 Shareholders' equity 985,535 864,267 $ 1,060,320 $ 938,787 Statements of Income (Loss) Year Ended December 31, (In thousands) 2019 2018 2017 Income Interest/other $ 679 $ 484 $ 2,104 Dividends from subsidiary Bank — — — Gain on sale of Visa Class B stock — — 15,153 679 484 17,257 Interest expense 3,368 3,165 2,499 Other expenses 651 879 649 (Loss) income before income taxes and equity in undistributed income of subsidiaries (3,340 ) (3,560 ) 14,109 Income tax (benefit) provision (702 ) (747 ) 4,938 (Loss) Income before equity in undistributed income of subsidiaries (2,638 ) (2,813 ) 9,171 Equity in undistributed income of subsidiaries 101,377 70,088 33,694 Net income $ 98,739 $ 67,275 $ 42,865 Statements of Cash Flows Year Ended December 31, (In thousands) 2019 2018 2017 Cash flows from operating activities Adjustments to reconcile net income to net cash provided by operating activities: Net Income $ 98,739 $ 67,275 $ 42,865 Equity in undistributed income of subsidiaries (101,377 ) (70,088 ) (33,694 ) Gain on sale of Visa Class B stock — — (15,153 ) Net (increase) decrease in other assets (738 ) (10,045 ) 1,415 Net increase (decrease) in other liabilities 265 (3,431 ) 4,005 Net cash provided by (used in) operating activities (3,111 ) (16,289 ) (562 ) Cash flows from investing activities Net cash paid for bank acquisition — (6,558 ) (27,862 ) Investment in unconsolidated subsidiary (10 ) — — Purchase of Visa Class B stock — — (6,180 ) Proceeds from sale of Visa Class B stock — 21,333 — Dividends from bank subsidiary 18,082 — — (Increase) decrease in securities purchased under agreement to resell, maturing within 30 days, net (12,849 ) (421 ) (20,475 ) Net cash provided by (used in) investment activities 5,223 14,354 (54,517 ) Cash flows from financing activities Issuance of common stock, net of related expense — — 55,641 Stock based employment benefit plans (2,239 ) 978 (56 ) Net cash provided by financing activities (2,239 ) 978 55,585 Net change in cash (127 ) (957 ) 506 Cash at beginning of year 197 1,154 648 Cash at end of year $ 70 $ 197 $ 1,154 Supplemental disclosure of cash flow information: Cash paid during the period for interest $ 3,186 $ 2,936 $ 2,205

Contingent Liabilities and Comm

Contingent Liabilities and Commitments with Off-Balance Sheet Risk	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Contingent Liabilities and Commitments with Off-Balance Sheet Risk	Contingent Liabilities and Commitments with Off-Balance Sheet Risk The Company and its subsidiaries, because of the nature of their business, are at all times subject to numerous legal actions, threatened or filed. Management presently believes that none of the legal proceedings to which it is a party are likely to have a materially adverse effect on the Company’s consolidated financial condition, or operating results or cash flows. The Company's subsidiary bank is party to financial instruments with off balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, standby letters of credit, and limited partner equity commitments. The subsidiary bank’s exposure to credit loss in the event of non-performance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contract or notional amount of those instruments. The subsidiary bank uses the same credit policies in making commitments and standby letters of credit as they do for on balance sheet instruments. Unfunded commitments for the Company as of: December 31, (In thousands) 2019 2018 Contract or Notional Amount Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ 1,018,020 $ 982,739 Standby letters of credit and financial guarantees written: Secured 13,073 17,736 Unsecured 663 847 Unfunded limited partner equity commitment 6,011 7,252 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The subsidiary bank evaluates each customer's creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the bank upon extension of credit, is based on management's credit evaluation of the counterparty. Collateral held varies but may include accounts receivable, inventory, equipment, and commercial and residential real estate. Of the $1.0 billion in commitments to extend credit outstanding at December 31, 2019 , $399.7 million is secured by 1-4 family residential properties for individuals with approximately $39.4 million at fixed interest rates ranging from 3.24% to 6.50% . Standby letters of credit are conditional commitments issued by the subsidiary bank to guarantee the performance of a customer to a third party. These instruments have fixed termination dates and most end without being drawn; therefore, they do not represent a significant liquidity risk. Those guarantees are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing, and similar transactions. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The subsidiary bank holds collateral supporting these commitments for which collateral is deemed necessary. Collateral held for secured standby letters of credit at December 31, 2019 and 2018 totaled $13.2 million and $19.1 million , respectively. Unfunded limited partner equity commitments at December 31, 2019 totaled $6.0 million that the Company has committed to small business investment companies under the SBIC Act to be used to provide capital to small businesses and entities that provide low income housing tax credits.

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Under ASC Topic 820, fair value measurements for items measured at fair value on a recurring and nonrecurring basis at December 31, 2019 and December 31, 2018 included: Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs (In thousands) Measurements Level 1 Level 2 Level 3 At December 31, 2019 Available-for-sale debt securities 1 $ 946,855 $ 100 $ 946,755 $ — Loans held for sale 2 20,029 — 20,029 — Loans 3 5,123 — 1,419 3,704 Other real estate owned 4 12,390 — 241 12,149 Equity securities 5 6,392 6,392 — — At December 31, 2018 Available-for-sale debt securities 1 $ 865,831 $ 100 $ 865,731 $ — Loans held for sale 2 11,873 — 11,873 — Loans 3 8,590 — 2,290 6,300 Other real estate owned 4 12,802 — 297 12,505 Equity securities 5 6,205 6,205 — — 1 See Note D for further detail of fair value of individual investment categories. 2 Recurring fair value basis determined using observable market data. 3 See Note E. Nonrecurring fair value adjustments to loans identified as impaired reflect full or partial write- downs that are based on the loan’s observable market price or current appraised value of the collateral in accordance with ASC Topic 310. 4 Fair value is measured on a nonrecurring basis in accordance with ASC Topic 360. 5 An investment in shares of a mutual fund that invests primarily in CRA-qualified debt securities, reported at fair value in Other Assets. Recurring fair value basis is determined using market quotations. Loans held for sale : Fair values are based upon estimated values to be received from independent third party purchasers. These loans are intended for sale and the Company believes the fair value is the best indicator of the resolution of these loans. Fair market value changes occur due to changes in interest rates, the borrower’s credit, the secondary loan market and the market for a borrower’s debt. Interest income is recorded based on contractual terms of the loan in accordance with Company policy on loans held for investment. None of the loans are 90 days or more past due or on nonaccrual as of December 31, 2019 and 2018 . The aggregate fair value and contractual balance of loans held for sale as of December 31, 2019 and 2018 is as follows: December 31, (In thousands) 2019 2018 Aggregate fair value $ 20,029 $ 11,873 Contractual balance 19,445 11,562 Excess 584 311 Loans : Level 2 loans consist of impaired real estate loans which are collateral dependent. Fair value is based on recent real estate appraisals less estimated costs of sale. For residential real estate impaired loans, appraised values or internal evaluation are based on the comparative sales approach. Level 3 loans consist of commercial and commercial real estate impaired loans. For these loans evaluations may use either a single valuation approach or a combination of approaches, such as comparative sales, cost and/or income approach. A significant unobservable input in the income approach is the estimated capitalization rate for a given piece of collateral. At December 31, 2019 the range of capitalization rates utilized to determine fair value of the underlying collateral averaged approximately 7.4% . Adjustments to comparable sales may be made by an appraiser to reflect local market conditions or other economic factors and may result in changes in the fair value of an asset over time. As such, the fair value of these impaired loans is considered level 3 in the fair value hierarchy. Impaired loans measured at fair value totaled $5.1 million with a specific reserve of $2.9 million at December 31, 2019 , compared to $8.6 million with a specific reserve of $2.7 million at December 31, 2018 . For loans classified as level 3, the changes included loans migrating to OREO of $4.7 million and paydowns and chargeoffs of $1.9 million , offset by additions of $4.0 million during the twelve months ended December 31, 2019 . Other real estate owned : When appraisals are used to determine fair value and the appraisals are based on a market approach, the fair value of other real estate owned ("OREO") is classified as level 2. When the fair value of OREO is based on appraisals which require significant adjustments to market-based valuation inputs or apply an income approach based on unobservable cash flows, the fair value of OREO is classified as Level 3. For OREO classified as level 3 during the twelve months ended December 31, 2019 , changes included addition of foreclosed loans of $5.5 million , offset by reductions primarily consisting of sales of $5.5 million and writedowns of $0.4 million . Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincides with the Company's monthly and/or quarter valuation process. There were no such transfers during the twelve months ended December 31, 2019 and 2018 . The carrying amount and fair value of the Company's other significant financial instruments that were not disclosed previously in the balance sheet and for which carrying amount is not fair value as of December 31, 2019 and December 31, 2018 is as follows: Carrying Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs (In thousands) Amount Level 1 Level 2 Level 3 At December 31, 2019 Financial Assets Debt securities held-to-maturity 1 $ 261,369 $ — $ 262,213 $ — Time deposits with other banks 3,742 — — 3,744 Loans, net 5,158,127 — — 5,139,491 Financial Liabilities Deposits 5,584,753 — — 5,584,621 Federal Home Loan Bank (FHLB) borrowings 315,000 — — 314,995 Subordinated debt 71,085 — 64,017 — At December 31, 2018 Financial Assets Debt securities held-to-maturity 1 $ 357,949 $ — $ 349,895 $ — Time deposits with other banks 8,243 — — 8,132 Loans, net 4,784,201 — — 4,835,248 Financial Liabilities Deposits 5,177,240 — — 5,172,098 Federal Home Loan Bank (FHLB) borrowings 380,000 — — 380,027 Subordinated debt 70,804 — 61,224 — 1 See Note D for further detail of recurring fair value basis of individual investment categories. The short maturity of Seacoast’s assets and liabilities results in having a significant number of financial instruments whose fair value equals or closely approximates carrying value. Such financial instruments are reported in the following balance sheet captions: cash and due from banks, interest bearing deposits with other banks, FHLB borrowings and securities sold under agreement to repurchase. The following methods and assumptions were used to estimate the fair value of each class of financial instrument for which it is practicable to estimate that value at December 31, 2019 and December 31, 2018 : Debt securities : U.S. Treasury securities are reported at fair value utilizing Level 1 inputs. Other securities are reported at fair value utilizing Level 2 inputs. The estimated fair value of a security is determined based on market quotations when available or, if not available, by using quoted market prices for similar securities, pricing models or discounted cash flow analyses, using observable market data where available. The Company reviews the prices supplied by independent pricing services, as well as their underlying pricing methodologies, for reasonableness and to ensure such prices are aligned with traditional pricing matrices. The fair value of collateralized loan obligations is determined from broker quotes. From time to time, the Company will validate, on a sample basis, prices supplied by the independent pricing service by comparison to prices obtained from other brokers and third-party sources or derived using internal models. Loans : Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial, mortgage, etc. Each loan category is further segmented into fixed and adjustable rate interest terms and by performing and nonperforming categories. The fair value of loans is calculated by discounting scheduled cash flows through the estimated life including prepayment considerations, using estimated market discount rates that reflect the risks inherent in the loan. The fair value approach considers market-driven variables including credit related factors and reflects an "exit price" as defined in ASC Topic 820. Deposit Liabilities : The fair value of demand deposits, savings accounts and money market deposits is the amount payable at the reporting date. The fair value of fixed maturity certificates of deposit is estimated using the rates currently offered for funding of similar remaining maturities.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per common share is computed by dividing net income available to common shareholders by the weighted average number of shares of common stock outstanding during the year. In 2019 , 2018 , and 2017 , options to purchase 491,000 , 483,000 , and 274,000 shares, respectively, were antidilutive and accordingly were excluded in determining diluted earnings per share. For the Year Ended December 31 (In thousands, except per share data) 2019 2018 2017 Basic earnings per share Net Income $ 98,739 $ 67,275 $ 42,865 Total weighted average common stock outstanding 51,449 47,969 42,613 Net income per share $ 1.92 $ 1.40 $ 1.01 Diluted earnings per share Net Income $ 98,739 $ 67,275 $ 42,865 Total weighted average common stock outstanding 51,449 47,969 42,613 Add: Dilutive effect of employee restricted stock and stock options (See Note J) 580 779 737 Total weighted average diluted stock outstanding 52,029 48,748 43,350 Net income per share $ 1.90 $ 1.38 $ 0.99

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Business Combinations	Business Combinations Acquisition of GulfShore Bancshares, Inc. On April 7, 2017, the Company completed its acquisition of GulfShore Bancshares, Inc. (" GulfShore "), the parent company of GulfShore Bank. Simultaneously, upon completion of the merger, GulfShore ’s wholly owned subsidiary bank, GulfShore Bank, was merged with and into Seacoast Bank. GulfShore , headquartered in Tampa, Florida, operated 3 branches in Tampa and St. Petersburg. This acquisition added $357.6 million in total assets, $250.9 million in loans and $285.4 million in deposits to Seacoast. As a result of this acquisition the Company enhanced its presence in the Tampa, Florida market, expanded its customer base and leveraged operating cost through economies of scale, and positively affected 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. The Company acquired 100% of the outstanding common stock of GulfShore . Under the terms of the definitive agreement, GulfShore shareholders received, for each share of GulfShore common stock, the combination of $1.47 in cash and 0.4807 shares of Seacoast common stock (based on Seacoast’s closing price of $23.94 per share on April 7, 2017). (In thousands, except per share data) April 7, 2017 Shares exchanged for cash $ 8,034 Number of GulfShore Bancshares, Inc. common shares outstanding 5,464 Per share exchange ratio 0.4807 Number of shares of common stock issued 2,627 Multiplied by common stock price per share on April 7, 2017 $ 23.94 Value of common stock issued 62,883 Total purchase price $ 70,917 The acquisition was accounted for under the acquisition method in accordance with ASC Topic 805, Business Combinations . The Company recognized goodwill of $37.1 million for this acquisition that is nondeductible for tax purposes. Determining fair values of assets and liabilities, especially the loan portfolio, core deposit intangibles, and deferred taxes, is a complicated process involving significant judgment regarding methods and assumptions used to calculate estimated fair values. (In thousands) April 7, 2017 Assets: Cash $ 38,267 Time deposits with other banks 17,273 Investment securities 316 Loans, net 250,876 Fixed assets 1,307 Other real estate owned 13 Core deposit intangibles 3,927 Goodwill 37,098 Other assets 8,572 Total assets $ 357,649 Liabilities: Deposits $ 285,350 Other liabilities 1,382 Total liabilities $ 286,732 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. April 7, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 101,281 $ 99,598 Commercial real estate 106,729 103,905 Construction/development/land 13,175 11,653 Commercial loans 32,137 32,247 Consumer and other loans 3,554 3,473 Purchased credit-impaired — — Total acquired loans $ 256,876 $ 250,876 No loans acquired were specifically identified with credit deficiency factor(s), pursuant to ASC Topic 310-30. The factors we considered to identify loans as PCI loans were all acquired loans that were nonaccrual, 60 days or more past due, designated as TDR, graded “special mention” or “substandard.” Loans without specifically identified credit deficiency factors are referred to as PULs for disclosure purposes. These loans were then evaluated to determine estimated fair values as of the acquisition date. Although no specific credit deficiencies were identifiable, we believe there is an element of risk as to whether all contractual cash flows will be eventually received. Factors that were considered included the economic environment both nationally and locally as well as the real estate market particularly in Florida. We have applied ASC Topic 310-20 accounting treatment to the PULs. The Company believes the deposits assumed from the acquisition have an intangible value. 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 NorthStar Banking Corporation On October 20, 2017, the Company completed its acquisition of NorthStar Banking Corporation (“ NorthStar ”). Simultaneously, upon completion of the merger of NorthStar with and into the Company, NorthStar ’s wholly owned subsidiary bank, NorthStar Bank, was merged with and into Seacoast Bank. NorthStar , headquartered in Tampa, Florida, operated three branches in Tampa, of which all have been retained as Seacoast locations. This acquisition added $216.3 million in total assets, $136.8 million in loans and $182.4 million in deposits to Seacoast. As a result of this acquisition the Company enhanced its presence in the Tampa, Florida market, expanded its customer base and leveraged operating cost through economies of scale, and positively affected 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. The Company acquired 100% of the outstanding common stock of NorthStar . Under the terms of the definitive agreement, NorthStar shareholders received, for each share of NorthStar common stock, the combination of $2.40 in cash and 0.5605 shares of Seacoast common stock (based on Seacoast’s closing price of $24.92 per share on October 20, 2017). (In thousands, except per share data) October 20, 2017 Shares exchanged for cash $ 4,701 Number of NorthStar Banking Corporation common shares outstanding 1,958 Per share exchange ratio 0.5605 Number of shares of common stock issued 1,098 Multiplied by common stock price per share on October 20, 2017 $ 24.92 Value of common stock issued 27,353 Cash paid for NorthStar Banking Corporation vested stock options 801 Total purchase price $ 32,855 The acquisition was accounted for under the acquisition method in accordance with ASC Topic 805, Business Combinations . The Company recognized goodwill of $12.3 million for this acquisition that is nondeductible for tax purposes. Determining fair values of assets and liabilities, especially the loan portfolio core deposit intangibles, and deferred taxes, is a complicated process involving significant judgment regarding methods and assumptions used to calculate estimated fair values. The adjustments reflected in the table below are the result of information obtained subsequent to the initial measurement. (In thousands) Initially Measured October 20, 2017 Measurement Period Adjustments As Adjusted October 20, 2017 Assets: Cash $ 5,485 $ — $ 5,485 Investment securities 56,123 — 56,123 Loans, net 136,832 — 136,832 Fixed assets 2,637 — 2,637 Core deposit intangibles 1,275 — 1,275 Goodwill 12,404 (99 ) 12,305 Other assets 1,522 99 1,621 Total assets $ 216,278 $ — $ 216,278 Liabilities: Deposits $ 182,443 $ — $ 182,443 Other liabilities 980 — 980 Total liabilities $ 183,423 $ — $ 183,423 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. October 20, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 15,111 $ 15,096 Commercial real estate 73,139 69,554 Construction/development/land 11,706 10,390 Commercial loans 31,200 30,854 Consumer and other loans 6,761 6,645 Purchased credit-impaired 5,527 4,293 Total acquired loans $ 143,444 $ 136,832 For the loans acquired we first segregated all acquired loans with specifically identified credit deficiency factor(s). The factors we considered to identify loans as PCI loans were all acquired loans that were nonaccrual, 60 days or more past due, designated as TDR, graded “special mention” or “substandard.” These loans were then evaluated to determine estimated fair values as of the acquisition date. As required by generally accepted accounting principles, we are accounting for these loans 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 October 20, 2017 for purchased credit-impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. (In thousands) October 20, 2017 Contractually required principal and interest $ 5,596 Non-accretable difference (689 ) Cash flows expected to be collected 4,907 Accretable yield (614 ) Total purchased credit-impaired loans acquired $ 4,293 Loans without specifically identified credit deficiency factors are referred to as PULs for disclosure purposes. These loans were then evaluated to determine estimated fair values as of the acquisition date. Although no specific credit deficiencies were identifiable, we believe there is an element of risk as to whether all contractual cash flows will be eventually received. Factors that were considered included the economic environment both nationally and locally as well as the real estate market particularly in Florida. We have applied ASC Topic 310-20 accounting treatment to the PULs. The Company believes the deposits assumed from the acquisition have an intangible value. 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 Palm Beach Community Bank On November 3, 2017, the Company completed its acquisition of Palm Beach Community Bank (“ PBCB ”). PBCB was merged with and into Seacoast Bank. This acquisition added $357.0 million in total assets, $270.3 million in loans and $268.6 million in deposits to Seacoast. PBCB , headquartered in West Palm Beach, Florida, operated four branches in West Palm Beach. As a result of this acquisition the Company enhanced its presence in the Palm Beach, Florida market, expanded its customer base and leveraged operating cost through economies of scale, and positively affected 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. The Company acquired 100% of the outstanding common stock of PBCB . Under the terms of the definitive agreement, PBCB shareholders received, for each share of PBCB common stock, the combination of $6.26 in cash and 0.9240 shares of Seacoast common stock (based on Seacoast’s closing price of $24.31 per share on November 3, 2017). (In thousands, except per share data) November 3, 2017 Shares exchanged for cash $ 15,694 Number of Palm Beach Community Bank common shares outstanding 2,507 Per share exchange ratio 0.9240 Number of shares of common stock issued 2,316 Multiplied by common stock price per share on November 3, 2017 $ 24.31 Value of common stock issued 56,312 Total purchase price $ 72,006 The acquisition was accounted for under the acquisition method in accordance with ASC Topic 805, Business Combinations . The Company recognized goodwill of $34.5 million for this acquisition that is nondeductible for tax purposes. Determining fair values of assets and liabilities, especially the loan portfolio, core deposit intangibles, and deferred taxes, is a complicated process involving significant judgment regarding methods and assumptions used to calculate estimated fair values. The adjustments reflected in the table below are the result of information obtained subsequent to the initial measurement. (In thousands) Initially Measured November 3, 2017 Measurement Period Adjustments As Adjusted November 3, 2017 Assets: Cash $ 9,301 $ — $ 9,301 Investment securities 22,098 — 22,098 Loans, net 272,090 (1,772 ) 270,318 Fixed assets 7,641 — 7,641 Core deposit intangibles 2,523 — 2,523 Goodwill 33,428 1,076 34,504 Other assets 9,909 696 10,605 Total assets $ 356,990 $ — $ 356,990 Liabilities: Deposits $ 268,633 $ — $ 268,633 Other liabilities 16,351 — 16,351 Total liabilities $ 284,984 $ — $ 284,984 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. November 3, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 30,153 $ 30,990 Commercial real estate 134,705 132,089 Construction/development/land 69,686 67,425 Commercial loans 36,076 35,876 Consumer and other loans 179 172 Purchased credit-impaired 4,768 3,766 Total acquired loans $ 275,567 $ 270,318 For the loans acquired we first segregated all acquired loans with specifically identified credit deficiency factor(s). The factors we considered to identify loans as PCI loans were all acquired loans that were nonaccrual, 60 days or more past due, designated as TDR, graded “special mention” or “substandard.” These loans were then evaluated to determine estimated fair values as of the acquisition date. As required by generally accepted accounting principles, we are accounting for these loans 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 November 3, 2017 for purchased credit-impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. (In thousands) November 3, 2017 Contractually required principal and interest $ 4,768 Non-accretable difference (1,002 ) Cash flows expected to be collected 3,766 Accretable yield — Total purchased credit-impaired loans acquired $ 3,766 Loans without specifically identified credit deficiency factors are referred to as PULs for disclosure purposes. These loans were then evaluated to determine estimated fair values as of the acquisition date. Although no specific credit deficiencies were identifiable, we believe there is an element of risk as to whether all contractual cash flows will be eventually received. Factors that were considered included the economic environment both nationally and locally as well as the real estate market particularly in Florida. We have applied ASC Topic 310-20 accounting treatment to the PULs. The Company believes the deposits assumed from the acquisition have an intangible value. 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 First Green Bancorp, Inc. On October 19, 2018, the Company completed its acquisition of First Green Bancorp, Inc ("First Green"). Simultaneously, upon completion of the merger of First Green and the Company, First Green's wholly owned subsidiary bank, First Green Bank, was merged with and into Seacoast Bank. Prior to the acquisition, First Green operated seven branches in the Orlando, Daytona, and Fort Lauderdale markets. As a result of this acquisition, the Company enhanced its presence in the Orlando, Daytona and Fort Lauderdale, Florida markets, expanded its customer base and leverage operating cost through economies of scale, and positively affected 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. The Company acquired 100% of the outstanding common stock of First Green. Under the terms of the definitive agreement, each share of First Green common stock was converted into the right to receive 0.7324 shares of Seacoast common stock. (In thousands, except per share data) October 19, 2018 Number of First Green common shares outstanding 5,462 Per share exchange ratio 0.7324 Number of shares of common stock issued 4,000 Multiplied by common stock price per share on October 19, 2018 $ 26.87 Value of common stock issued 107,486 Cash paid for First Green vested stock options 6,558 Total purchase price $ 114,044 The acquisition of First Green was accounted for under the acquisition method in accordance with ASC Topic 805, Business Combinations . The Company recognized goodwill of $56.7 million for this acquisition that is nondeductible for tax purposes. Determining fair values of assets and liabilities, especially the loan portfolio, core deposit intangibles, and deferred taxes, is a complicated process involving significant judgment regarding methods and assumptions used to calculate estimated fair values. The adjustments reflected in the table below are the result of information obtained subsequent to the initial measurement. (In thousands) Initially Measured October 19, 2018 Measurement Period Adjustments As Adjusted October 19, 2018 Assets: Cash $ 29,434 $ — $ 29,434 Investment securities 32,145 — 32,145 Loans, net 631,497 — 631,497 Fixed assets 16,828 — 16,828 Other real estate owned 410 — 410 Core deposit intangibles 10,170 (676 ) 9,494 Goodwill 56,198 533 56,731 Other assets 40,669 178 40,847 Total assets $ 817,351 $ 35 $ 817,386 Liabilities: Deposits $ 624,289 $ — $ 624,289 Other liabilities 79,018 35 79,053 Total liabilities $ 703,307 $ 35 $ 703,342 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. October 19, 2018 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 101,674 $ 101,119 Commercial real estate 437,767 406,613 Construction/development/land 61,195 58,385 Commercial loans 56,288 54,973 Consumer and other loans 9,156 8,942 Purchased credit-impaired 2,136 1,465 Total acquired loans $ 668,216 $ 631,497 For the loans acquired we first segregated all acquired loans with specifically identified credit deficiency factor(s). The factors we considered to identify loans as PCI loans were all acquired loans that were nonaccrual, 60 days or more past due, designated as TDR, graded “special mention” or “substandard.” These loans were then evaluated to determine estimated fair values as of the acquisition date. As required by generally accepted accounting principles, we are accounting for these loans 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 October 19, 2018 for purchased credit-impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. (In thousands) October 19, 2018 Contractually required principal and interest $ 2,136 Non-accretable difference (671 ) Cash flows expected to be collected 1,465 Accretable yield — Total purchased credit-impaired loans acquired $ 1,465 Loans without specifically identified credit deficiency factors are referred to as PULs for disclosure purposes. These loans were then evaluated to determine estimated fair values as of the acquisition date. Although no specific credit deficiencies were identifiable, we believe there is an element of risk as to whether all contractual cash flows will be eventually received. Factors that were considered included the economic environment both nationally and locally as well as the real estate market particularly in Florida. We have applied ASC Topic 310-20 accounting treatment to the PULs. The Company believes the deposits assumed from the acquisition have an intangible value. 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 Costs Acquisition costs included in the Company’s income statement for the years ended December 31, 2019 , 2018 and 2017 are $1.0 million , $9.7 million , and $12.9 million , respectively. Pro-Forma Information Pro-forma data as of 2018 and 2017 present information as if the acquisitions of GulfShore, NorthStar, PBCB, and First Green occurred at the beginning of 2017 : Twelve Months Ended December 31, (In thousands, except per share data) 2018 2017 Net interest income $ 238,498 $ 223,508 Net income available to common shareholders 82,307 62,188 EPS - basic $ 1.61 $ 1.24 EPS - diluted $ 1.58 $ 1.22

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
General	General: Seacoast Banking Corporation of Florida (“Seacoast” or the “Company”) is a single segment financial holding company with one operating subsidiary bank, Seacoast National Bank (“Seacoast Bank”). The Company provides integrated financial services including commercial and retail banking, wealth management, and mortgage services to customers through advanced banking solutions, 48 traditional branch offices and nine commercial banking centers operated by Seacoast Bank. Seacoast operates primarily in Florida, with concentrations in the state's fastest growing markets, each with unique characteristics and opportunities. Offices stretch from the southeast, including Fort Lauderdale, Boca Raton and Palm Beach north along the east coast to the Daytona area, into Orlando and Central Florida and the adjacent Tampa market, and west to Okeechobee and surrounding counties. The consolidated financial statements include the accounts of Seacoast and all its majority-owned subsidiaries but exclude trusts created for the issuance of trust preferred securities. In consolidation, all significant intercompany accounts and transactions are eliminated. The accounting and reporting policies of the Company are in accordance with accounting principles generally accepted in the United States of America, and they conform to general practices within the applicable industries. Certain prior period amounts have been reclassified to conform to the current period presentation.
Use of Estimates	Use of Estimates: The preparation of consolidated financial statements requires management to make judgments in the application of certain accounting policies that involve significant estimates and assumptions. The Company has established policies and control procedures that are intended to ensure valuation methods are well controlled and applied consistently from period to period. These estimates and assumptions, which may materially affect the reported amounts of certain assets, liabilities, revenues and expenses, are based on information available as of the date of the financial statements, and changes in this information over time and the use of revised estimates and assumptions could materially affect amounts reported in subsequent financial statements. Specific areas, among others, requiring the application of management’s estimates include determination of the allowance for loan losses, acquisition accounting and purchased loans, intangible assets and impairment testing, other fair value adjustments, other than temporary impairment of securities, income taxes and realization of deferred tax assets and contingent liabilities.
Cash and Cash Equivalents	Cash and Cash Equivalents: Cash and cash equivalents include cash and due from banks and interest-bearing bank balances. Cash equivalents have original maturities of three months or less, and accordingly, the carrying amount of these instruments is deemed to be a reasonable estimate of fair value
Time Deposits with Other Banks	Time deposits with other banks: Time deposits with other banks consist of certificates of deposit with original maturities greater than three months and are carried at cost.
Securities Purchased and Sold Agreements	Securities Purchased and Sold Agreements: Securities purchased under resale agreements and securities sold under repurchase agreements are generally accounted for as collateralized financing transactions and are recorded at the amount at which the securities were acquired or sold plus accrued interest. It is the Company’s policy to take possession of securities purchased under resale agreements, which are primarily U.S. government and government agency securities. The fair value of securities purchased and sold is monitored and collateral is obtained from or returned to the counterparty when appropriate.
Securities	Securities: Debt securities are classified at date of purchase as available-for-sale or held-to-maturity. Debt securities that may be sold as part of the Company's asset/liability management or in response to, or in anticipation of, changes in interest rates and resulting prepayment risk, or for other factors are stated at fair value with unrealized gains or losses reflected as a component of shareholders' equity net of tax or included in noninterest income as appropriate. Debt securities that the Company has the ability and intent to hold to maturity are carried at amortized cost. Equity securities are stated at fair value with unrealized gains or losses included in noninterest income as securities gains or losses. The estimated fair value of a security is determined based on market quotations when available or, if not available, by using quoted market prices for similar securities, pricing models or discounted cash flow analyses, using observable market data where available. Realized gains and losses, including other than temporary impairments, are included in noninterest income as investment securities gains (losses). Interest and dividends on securities, including amortization of premiums and accretion of discounts on debt securities, is recognized in interest income on an accrual basis using the interest method. The Company anticipates prepayments of principal in the calculation of the effective yield for collateralized mortgage obligations and mortgage backed securities by obtaining estimates of prepayments from independent third parties. The adjusted cost of each specific security sold is used to compute realized gains or losses on the sale of securities on a trade date basis. On a quarterly basis, the Company makes an assessment to determine whether there have been any events or economic circumstances to indicate that a security is impaired on an other than temporary basis. Management considers many factors including the length of time the security has had a fair value less than the cost basis; recent events specific to the issuer or industry; external credit ratings and recent downgrades. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a debt security in an unrealized loss position before recovery of its amortized cost basis. Debt securities for which there is an unrealized loss that is deemed to be other-than temporary are written down to fair value with the write-down recorded as a realized loss. On January 1, 2019, the Company adopted Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") 2017-12 “Derivatives and Hedging" (Topic 815): Targeted Improvements to Accounting for Hedging Activities. Upon adoption, certain debt securities were reclassified from held-to-maturity to available-for-sale. The following table summarizes the impact: January 1, 2019 (In thousands) Amortized Cost Net Unrealized Gain (Loss) Reflected in OCI Fair Value Private mortgage-backed securities and collateralized mortgage obligations $ 21,526 $ 147 $ 21,673 Collateralized loan obligations 32,000 (877 ) 31,123 Totals $ 53,526 $ (730 ) $ 52,796 Seacoast Bank is a member of the Federal Home Loan Bank (“FHLB”) system. Members are required to own a certain amount of FHLB stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB stock is carried at cost, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income.
Loans	Loans: The Company accounts for a loan depending on the strategy for the loan and on the credit impaired status of the loan upon acquisition. Loans are accounted for using the following categories: • Loans and leases held for sale • Loans and leases originated by the Company and held for investment • Loans and leases purchased by the Company, which are considered purchased unimpaired (“PUL), and held for investment • Loans and leases purchased by the Company, which are considered purchased credit impaired (“PCI”) Loans that are held for sale are carried as held for sale based on management’s intent to sell the loans, either as part of a core business strategy or related to a risk mitigation strategy. Loans held for sale and any related unfunded lending commitments are recorded at fair value, if elected, or the lower of cost (which is the carrying amount net of deferred fees and costs and applicable allowance for loan losses and reserve for unfunded lending commitments) or fair market value less costs to sell. Adjustments to reflect unrealized gains and losses resulting from changes in fair value and realized gains and losses upon ultimate sale of the loans are classified as noninterest income in the Consolidated Statements of Income. At the time of the transfer to loans held for sale, if the fair market value is less than cost, the difference is recorded as additional provision for credit losses in the results of operations. Fair market value is determined based on quoted market prices for the same or similar loans, outstanding investor commitments or discounted cash flow analyses using market assumptions. Fair values are based upon estimated values to be received from independent third party purchasers. These loans are intended for sale and the Company believes the fair value is the best indicator of the resolution of these loans. Fair market value changes occur due to changes in interest rates, the borrower’s credit, the secondary loan market and the market for a borrower’s debt. Individual loans or pools of loans are transferred from the loan portfolio to loans held for sale when the intent to hold the loans has changed and there is a plan to sell the loans within a reasonable period of time. Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are considered held for investment. Loans originated by Seacoast and held for investment are recognized at the principal amount outstanding, net of unearned income and amounts charged off. Unearned income includes discounts, premiums and deferred loan origination fees reduced by loan origination costs. Unearned income on loans is amortized to interest income over the life of the related loan using the effective interest rate method. Interest income is recognized on an accrual basis. As a part of business acquisitions, the Company acquires loans which are recorded at fair value on the acquisition date. Accordingly, the associated allowance for credit losses related to these loans is not carried over at the acquisition date. Any losses after acquisition are recognized through the allowance for loan losses. These loans fall into two groups: purchased unimpaired loans (“PUL”) and purchased credit-impaired loans (“PCI”). PULs demonstrate no evidence of significant credit deterioration and there is an expectation that all contractual payments will be made. The Company determines fair value by estimating the amount and timing of expected future cash flows and assigning a discount or premium to each loan. The difference between the expected cash flows and the amount paid is recorded as interest income over the remaining life of the loan. PCI loans demonstrate evidence of credit deterioration since origination and the risk that all contractual payments will not be made. The Company estimates fair value by estimating 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 on a quarterly basis. Probable decreases in expected loan principal cash flows trigger the recognition of impairment, which is then measured as the present value of the expected principal loss plus any related foregone interest cash flows discounted at the loan’s effective interest rate. Impairments that occur after the acquisition date are recognized through the 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. 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. 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. In contrast, PULs are evaluated using the same procedures as used for the Company’s non-purchased loan portfolio. Under certain scenarios, the Company will grant modifications to a loan when a borrower is experiencing financial difficulties. Such modifications allow the Company to minimize the risk of loss on the loan and maximize future cash flows received from the borrower. Such modifications are referred to as troubled debt restructured (TDR) loans. TDRs are considered impaired and placed in nonaccrual status. If borrowers perform pursuant to the modified loan terms for at least six months and the remaining loan balances are considered collectible, the loans are returned to accrual status. The Company reviews all loans for impairment on a periodic basis. A loan is considered to be impaired when, based on current information, it is probable the Company will not receive all amounts due in accordance with the contractual terms of a loan agreement. The fair value is measured based on either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. When the ultimate collectability of the principal balance of an impaired loan is in doubt, all cash receipts are applied to principal. Once the recorded principal balance has been reduced to zero, future cash receipts are applied to interest income, to the extent any interest has been forgone, and then they are recorded as recoveries of any amounts previously charged off. The accrual of interest is generally discontinued on loans, except consumer loans, that become 90 days past due as to principal or interest unless collection of both principal and interest is assured by way of collateralization, guarantees or other security. When interest accruals are discontinued, unpaid interest is reversed against interest income. Consumer loans that become 120 days past due are generally charged off. When borrowers demonstrate over an extended period the ability to repay a loan in accordance with the contractual terms of a loan classified as nonaccrual, the loan is returned to accrual status. Interest income on nonaccrual loans is either recorded using the cash basis method of accounting or recognized after the principal has been reduced to zero, depending on the type of loan. The Company accounts for a loan depending on the strategy for the loan and on the credit impaired status of the loan upon acquisition. Loans are accounted for using the following categories: • Loans and leases held for sale • Loans and leases originated by the Company and held for investment • Loans and leases purchased by the Company, which are considered purchased unimpaired (“PUL”), and held for investment • Loans and leases purchased by the Company, which are considered purchased credit impaired (“PCI”) Refer to Note A for further discussion on how the categories above are defined. Loans are also categorized based on the customer and use type of the credit extended. The following outlines the categories used: • Construction and Land Development Loans: The Company defines construction and land development loans as exposures secured by land development and construction (including 1-4 family residential construction), multi-family property, and non-farm nonresidential property where the primary or significant source of repayment is from proceeds of the sale, refinancing, or permanent financing of the property. • Commercial Real Estate Loans: Commercial real estate loans are subject to underwriting standards and processes similar to commercial and industrial loans. These loans are viewed primarily as cash flow loans and the repayment of these loans is largely dependent on rental income from the successful operation of the property. Loan performance may be adversely affected by factors impacting the general economy or conditions specific to the real estate market such as geographic location and/or property type. • Residential Real Estate Loans: The Company selectively adds residential mortgage loans to its portfolio, primarily loans with adjustable rates, home equity mortgages and home equity lines. Substantially all residential originations have been underwritten to conventional loan agency standards, including loans having balances that exceed agency value limitations. • Commercial and Financial Loans: Commercial credit is extended primarily to small to medium sized professional firms, retail and wholesale operators and light industrial and manufacturing concerns. Such credits typically comprise working capital loans, loans for physical asset expansion, asset acquisition and other business loans. Loans to closely held businesses will generally be guaranteed in full or for a meaningful amount by the businesses’ major owners. Commercial loans are based primarily on the historical and projected cash flow of the borrower and secondarily on the capacity of credit enhancements, guarantees and underlying collateral provided by the borrower. The cash flows of borrowers, however, may not behave as forecasted and collateral securing loans may fluctuate in value due to economic or individual performance factors. Minimum standards and underwriting guidelines have been established for all commercial loan types. • Consumer Loans: The Company originates consumer loans including installment loans and revolving lines, loans for automobiles, boats, and other personal, family and household purposes. For each loan type several factors including debt to income, type of collateral and loan to collateral value, credit history and Company relationship with the borrower are considered during the underwriting process.
Derivatives	Derivatives : The Company enters into derivative contracts with customers who request such services and into offsetting contracts with substantially matching terms with third parties to minimize the risks involved with these types of transactions.
Loan Commitments and Letters of Credit	Loan Commitments and Letters of Credit: Loan commitments and letters of credit are an off-balance sheet item and represent commitments to make loans or lines of credit available to borrowers. The face amount of these commitments represents an exposure to loss, before considering customer collateral or ability to repay. Such commitments are recognized as loans when funded. Fees received for providing loan commitments and letters of credit that may result in loans are typically deferred and amortized to interest income over the life of the related loan, beginning with the initial borrowing. Fees on commitments and letters of credit are amortized to noninterest income as banking fees and commissions on a straight-line basis over the commitment period when funding is not expected.
Fair Value Measurements	Fair Value Measurements: The Company measures or monitors many of its assets and liabilities on a fair value basis. Certain assets are measured on a recurring basis, including available-for-sale securities and loans held for sale. These assets are carried at fair value on the Company’s balance sheets. Additionally, fair value is measured on a non-recurring basis to evaluate assets or liabilities for impairment or for disclosure purposes. Examples include impaired loans, OREO, mortgage servicing rights, goodwill, and long-lived assets. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, the Company uses various valuation techniques and assumptions when estimating fair value. The Company applies the following fair value hierarchy: Level 1 – Assets or liabilities for which the identical item is traded on an active exchange, such as publicly-traded instruments or futures contracts. Level 2 – Assets and liabilities valued based on observable market data for similar instruments. Level 3 – Assets and liabilities for which significant valuation assumptions are not readily observable in the market; instruments valued based on the best available data, some of which is internally-developed, and considers risk premiums that a market participant would require. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at and/or marked to fair value, the Company considers the principal market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability. When possible, the Company looks to active and observable markets to price identical assets or liabilities. When identical assets and liabilities are not traded in active markets, the Company looks to market observable data for similar assets and liabilities. Nevertheless, certain assets and liabilities are not actively traded in observable markets and the Company must use alternative valuation techniques to derive a fair value measurement.
Other Real Estate Owned	Other Real Estate Owned: Other real estate owned (“OREO”) consists primarily of real estate acquired in lieu of unpaid loan balances. These assets are carried at an amount equal to the loan balance prior to foreclosure plus costs incurred for improvements to the property, but no more than the estimated fair value of the property less estimated selling costs. Any valuation adjustments required at the date of transfer are charged to the allowance for loan losses. Subsequently, unrealized losses and realized gains and losses are included in other noninterest expense. Operating results from OREO are recorded in other noninterest expense. OREO may also include bank premises no longer utilized in the course of the Company's business (closed branches) that are initially recorded at the lower of carrying value or fair value, less costs to sell. If fair value of the premises is less than amortized book value, a write down is recorded through noninterest expense. Costs to operate the facility are expensed.
Bank Premises and Equipment	Bank Premises and Equipment: Bank premises and equipment are stated at cost, less accumulated depreciation and amortization. Premises and equipment include certain costs associated with the acquisition of leasehold improvements. Depreciation and amortization are recognized principally by the straight-line method, over the estimated useful lives as follows: buildings - 25 - 40 years, leasehold improvements 5 - 25 years, furniture and equipment - 3 - 12 years. Leasehold improvements typically amortize over the shorter of lease terms or estimated useful life. Premises and equipment and other long-term assets are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are written down to fair value with a corresponding impact to noninterest expense
Leases	Leases: On January 1, 2019, the Company adopted FASB ASU 2016-02, “Leases”, and all the related amendments (collectively, Accounting Standards Codification “ASC” Topic 842) through a cumulative-effect adjustment. The new guidance requires a lessee to recognize at the transition date right-of-use assets ("ROUA") and lease liabilities for all operating leases. Upon adoption, the Company recognized ROUAs of $29 million and lease liabilities of $33 million . Operating lease liabilities are measured based on the present value of lease payments over the lease term. At the transition date, ROUA was determined by adjusting lease liabilities for the carrying balances of deferred rent under ASC Topic 840 Leases , cease-use liabilities under ASC Topic 420 Exit or Disposal Cost Obligations , and assets and liabilities recognized under ASC Topic 805 Business Combinations for acquired operating leases, which aggregated to $4 million . Arrangements are analyzed at inception to determine the existence of a lease. ROUAs represent the right to use the underlying asset and lease liabilities represent the obligation to make lease payments for the lease term. Operating lease ROUAs and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the appropriate term and information available at commencement date in determining the present value of lease payments. The lease term may include options to extend the lease when it is reasonably certain that the option will be exercised. ROUAs and operating lease liabilities are reported in Other Assets and Other Liabilities, respectively, in the Consolidated Balance Sheet. Lease expense for lease payments is recognized on a straight-line basis over the lease term and is classified as Occupancy or Furniture and Equipment expense based on the subject asset.
Intangible Assets	Intangible assets. The Company’s intangible assets consist of goodwill, core deposit intangibles (CDIs) and mortgage servicing rights. Goodwill results from business combinations and represents the difference between the purchase price and the fair value of net assets acquired. Goodwill may be adjusted for up to one year from the acquisition date in the event new information is obtained which, if known at the date of acquisitions would have impacted the fair value of the acquired assets and liabilities. Goodwill is considered to have an indefinite useful life and is not amortized, but rather tested for impairment annually in the fourth quarter, or more often if circumstances arise that may indicate risk of impairment. If impaired, goodwill is written down with a corresponding impact to noninterest expense. The Company recognizes CDIs that result from either whole bank acquisitions or branch acquisitions. They are initially measured at fair value and then amortized over periods ranging from six to eight years on a straight line basis. The Company evaluates CDIs for impairment annually, or more often if circumstances arise that may indicate risk of impairment. If impaired, the CDI is written down with a corresponding impact to noninterest expense.
Bank Owned Life Insurance (BOLI)	Bank owned life insurance (BOLI): The Company, through its subsidiary bank, has purchased or acquired through bank acquisitions, life insurance policies on certain key executives. BOLI 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.
Revenue Recognition	Revenue Recognition: Revenue recognized reflects the consideration to which the Company expects to be entitled in exchange for the services provided and is recognized when the promised services (performance obligations) are transferred to a customer, requiring the application of the following five-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. Relevant activity includes: • Service Charges on Deposits: Seacoast Bank offers a variety of deposit-related services to its customers through several delivery channels including branch offices, ATMs, telephone, mobile, and internet banking. Transaction-based fees are recognized when services, each of which represents a performance obligation, are satisfied. Service fees may be assessed monthly, quarterly, or annually; however, the account agreements to which these fees relate can be canceled at any time by Seacoast and/or the customer. Therefore, the contract term is considered a single day (a day-to-day contract). • Trust Fees: The Company earns trust fees from fiduciary services provided to trust customers which include custody of assets, recordkeeping, collection and distribution of funds. Fees are earned over time and accrued monthly as the Company provides services, and are generally assessed based on the market value of the trust assets under management at a particular date or over a particular period. • Brokerage Commissions and Fees: The Company earns commissions and fees from investment brokerage services provided to its customers through an arrangement with a third-party service provider. Commissions received from the third-party service provider are recorded monthly and are based upon customer activity. Fees are earned over time and accrued monthly as services are provided. The Company acts as an agent in this arrangement and therefore presents the brokerage commissions and fees net of related costs. • Interchange Income: Fees earned on card transactions depend upon the volume of activity, as well as the fees permitted by the payment network. Such fees are recognized by the Company upon fulfilling its performance obligation to approve the card transaction.
Allowance for Loan Losses and Reserve for Unfunded Lending Commitments	Allowance for Loan Losses and Reserve for Unfunded Lending Commitments: The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when the Company believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. The allowance for loan losses and reserve for unfunded lending commitments is maintained at a level the Company believes is adequate to absorb probable losses incurred in the loan portfolio and unfunded lending commitments as of the date of the consolidated financial statements. The Company employs a variety of modeling and estimation tools in developing the appropriate allowance for loan losses and reserve for unfunded lending commitments. If necessary, a specific allowance is established for individually evaluated impaired loans. The specific allowance established for these loans is based on a thorough analysis of the most probable source of repayment, including the present value of the loan’s expected future cash flows, the loan’s estimated market value, or the estimated fair value of the underlying collateral depending on the most likely source of repayment. General allowances are established for loans grouped into pools based on similar characteristics. In this process, general allowance factors are based on an analysis of historical charge-off experience, portfolio trends, regional and national economic conditions, and expected loss given default derived from the Company’s internal risk rating process. The Company monitors qualitative and quantitative trends in the loan portfolio, including changes in the levels of past due, criticized and nonperforming loans. The distribution of the allowance for loan losses and reserve for unfunded lending commitments between the various components does not diminish the fact that the entire allowance for loan losses and reserve for unfunded lending commitments is available to absorb credit losses in the loan portfolio. The principal focus is, therefore, on the adequacy of the total allowance for loan losses and reserve for unfunded lending commitments. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Company’s bank subsidiary’s allowance for loan losses and reserve for unfunded lending commitments. These agencies may require such subsidiary to recognize changes to the allowance for loan losses and reserve for unfunded lending commitments based on their judgments about information available to them at the time of their examination.
Income Taxes	Income Taxes
Earnings per Share	Earnings per Share: Basic earnings per share are computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during each period. Diluted earnings per share are based on the weighted-average number of common shares outstanding during each period, plus common share equivalents calculated for stock options and performance restricted stock outstanding using the treasury stock method.
Stock-Based Compensation	Stock-Based Compensation: The stock option plans are accounted for under ASC Topic 718 - Compensation - Stock Compensation and the fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with market assumptions. This amount is amortized on a straight-line basis over the vesting period, generally five years . For restricted stock awards, which generally vest based on continued service with the Company, the deferred compensation is measured as the fair value of the shares on the date of grant, and the deferred compensation is amortized as salaries and employee benefits in accordance with the applicable vesting schedule, generally straight-line over five years . Some shares vest based upon the Company achieving certain performance goals and salary amortization expense is based on an estimate of the most likely results on a straight line basis. The Company accounts for forfeitures as they occur.
Recently Issued Accounting Standards, Not Yet Adopted	Recently Issued Accounting Standards, Not Adopted at December 31, 2019 The following provides a brief description of accounting standards that have been issued but are not yet adopted that could have a material effect on the Company's financial statements: ASU 2016-13, Financial Instruments –Credit Losses (Topic 326) Description In June 2016, FASB issued guidance to replace the incurred loss model with an expected loss model, which is referred to as the current expected credit loss (CECL) model. The CECL model is applicable to the measurement of credit losses on financial assets measured at amortized cost, including loan receivables and held-to-maturity debt securities. It also applies to off-balance sheet credit exposures not accounted for as insurance (i.e. loan commitments, standby letters of credit, financial guarantees and other similar instruments). Date of Adoption The Company will adopt this accounting standard effective January 1, 2020. Effect on the Consolidated Financial Statements The Company currently expects that the initial adjustment to the allowance for loan losses will be an increase of approximately $19 - $23 million, bringing the ratio of allowance to total loans from 0.68% to between 1.06% and 1.12%. The increase is primarily attributed to the impact of the new guidance on the Company’s acquired loan portfolio, and to the new requirement to estimate losses over the full remaining expected life of the loans. For loans previously classified as purchased unimpaired (“PUL”), the standard requires that a reserve for expected credit losses be recorded through a cumulative effect adjustment in retained earnings, regardless of the impact of a purchase discount on the amortized cost basis. Existing purchase discounts and premiums on these loans are not affected by adoption of the standard, and these amounts will continue to accrete into interest income over the remaining lives of the loans on a level-yield basis. Existing purchased credit impaired (“PCI”) loans will be classified as purchased credit deteriorated (“PCD”) loans, and a reserve for expected credit losses will be established with a corresponding adjustment to the loans’ amortized cost basis. The remaining non-credit discounts on these loans will accrete into interest income on a level-yield basis over the remaining lives of the loans. The estimation process applies an economic forecast scenario which, as of January 1, 2020, projects a stable macroeconomic environment over the Company’s three year forecast period. For portfolio segments with a weighted average life longer than three years, the Company reverts to longer term historical loss experience, adjusted for prepayments, to estimate losses over the remaining life of the loans within each segment. The Company estimates the impact on the tier one capital ratio upon adoption is a decrease of approximately 32 basis points. Federal banking regulatory agencies have provided banks with the ability to mitigate the impact on capital at adoption by allowing the impact to be phased in over a four year period; however, the Company expects to forgo the phased in approach and recognize the impact to capital at the time of adoption. The Company does not expect adoption of the standard to have a material impact to its held-to-maturity debt security portfolio, which is comprised of securities guaranteed either explicitly or implicitly by government-sponsored entities. While available-for-sale debt (“AFS”) securities are not subject to the CECL allowance requirement, the new guidance requires the Company to record an allowance for AFS debt securities in an unrealized loss position if a portion of the unrealized loss is credit related. The Company does not expect adoption of the standard to have a material impact to AFS securities upon adoption. The disclosed estimates are subject to further refinement upon finalization of the Company’s review of the calculations, assumptions, methodologies and judgments. Internal controls over financial reporting relating to these new processes have been designed and implemented and are being evaluated. The Company is in the final stages of completing the formal governance and approval process. The ongoing impact to the Company’s results of operations in future periods will be influenced by the loan portfolio composition and by macroeconomic conditions and forecasts at each reporting date. Adoption of the standard is expected to result in higher volatility in the quarterly provision for credit losses when compared to the Company’s historical results under the incurred loss model. ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Description In January 2017, the FASB amended the existing guidance to simplify the goodwill impairment measurement test by eliminating Step 2. The amendment requires the Company to perform the goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognizing an impairment charge for the amount by which the carrying amount exceeds the fair value. Additionally, an entity should consider the tax effects from any tax deductible goodwill on the carrying amount when measuring the impairment loss. Date of Adoption This amendment is effective for public business entities for reporting periods beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted on annual goodwill impairment tests performed after January 1, 2017. Effect on the Consolidated Financial Statements The impact to the consolidated financial statements from the adoption of this pronouncement is not expected to be material.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Schedule of Reclassification of Debt Securities	The following table summarizes the impact: January 1, 2019 (In thousands) Amortized Cost Net Unrealized Gain (Loss) Reflected in OCI Fair Value Private mortgage-backed securities and collateralized mortgage obligations $ 21,526 $ 147 $ 21,673 Collateralized loan obligations 32,000 (877 ) 31,123 Totals $ 53,526 $ (730 ) $ 52,796

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Fair Value of Securities Available for Sale	The amortized cost, gross unrealized gains and losses and fair value of securities available-for-sale and held-to-maturity at December 31, 2019 and December 31, 2018 are summarized as follows: December 31, 2019 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt Securities Available-for-Sale U.S. Treasury securities and obligations of U.S. government agencies $ 9,914 $ 204 $ (4 ) $ 10,114 Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities 604,934 5,784 (1,511 ) 609,207 Private mortgage-backed securities and collateralized mortgage obligations 56,005 1,561 (5 ) 57,561 Collateralized loan obligations 239,364 7 (1,153 ) 238,218 Obligations of state and political subdivisions 30,548 1,208 (1 ) 31,755 Totals $ 940,765 $ 8,764 $ (2,674 ) $ 946,855 Debt Securities Held-to-Maturity Mortgage-backed securities of U.S. government sponsored entities $ 261,369 $ 2,717 $ (1,873 ) $ 262,213 Totals $ 261,369 $ 2,717 $ (1,873 ) $ 262,213 December 31, 2018 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt Securities Available-for-Sale U.S. Treasury securities and obligations of U.S. government agencies $ 7,200 $ 106 $ (6 ) $ 7,300 Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities 567,753 300 (14,047 ) 554,006 Private mortgage-backed securities and collateralized mortgage obligations 55,569 560 (401 ) 55,728 Collateralized loan obligations 212,807 1 (3,442 ) 209,366 Obligations of state and political subdivisions 39,543 339 (451 ) 39,431 Totals $ 882,872 $ 1,306 $ (18,347 ) $ 865,831 Debt Securities Held-to-Maturity Mortgage-backed securities of U.S. government sponsored entities $ 304,423 $ — $ (7,324 ) $ 297,099 Private mortgage-backed securities and collateralized mortgage obligations 21,526 277 (130 ) 21,673 Collateralized loan obligations 32,000 — (877 ) 31,123 Totals $ 357,949 $ 277 $ (8,331 ) $ 349,895
Summary of Amortized Cost and Fair Value of Securities Held to Maturity	The amortized cost, gross unrealized gains and losses and fair value of securities available-for-sale and held-to-maturity at December 31, 2019 and December 31, 2018 are summarized as follows: December 31, 2019 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt Securities Available-for-Sale U.S. Treasury securities and obligations of U.S. government agencies $ 9,914 $ 204 $ (4 ) $ 10,114 Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities 604,934 5,784 (1,511 ) 609,207 Private mortgage-backed securities and collateralized mortgage obligations 56,005 1,561 (5 ) 57,561 Collateralized loan obligations 239,364 7 (1,153 ) 238,218 Obligations of state and political subdivisions 30,548 1,208 (1 ) 31,755 Totals $ 940,765 $ 8,764 $ (2,674 ) $ 946,855 Debt Securities Held-to-Maturity Mortgage-backed securities of U.S. government sponsored entities $ 261,369 $ 2,717 $ (1,873 ) $ 262,213 Totals $ 261,369 $ 2,717 $ (1,873 ) $ 262,213 December 31, 2018 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt Securities Available-for-Sale U.S. Treasury securities and obligations of U.S. government agencies $ 7,200 $ 106 $ (6 ) $ 7,300 Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities 567,753 300 (14,047 ) 554,006 Private mortgage-backed securities and collateralized mortgage obligations 55,569 560 (401 ) 55,728 Collateralized loan obligations 212,807 1 (3,442 ) 209,366 Obligations of state and political subdivisions 39,543 339 (451 ) 39,431 Totals $ 882,872 $ 1,306 $ (18,347 ) $ 865,831 Debt Securities Held-to-Maturity Mortgage-backed securities of U.S. government sponsored entities $ 304,423 $ — $ (7,324 ) $ 297,099 Private mortgage-backed securities and collateralized mortgage obligations 21,526 277 (130 ) 21,673 Collateralized loan obligations 32,000 — (877 ) 31,123 Totals $ 357,949 $ 277 $ (8,331 ) $ 349,895 Held-to-Maturity Available-for-Sale (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in less than one year $ — $ — $ 3,472 $ 3,523 Due after one year through five years — — 8,582 8,698 Due after five years through ten years — — 10,488 10,979 Due after ten years — — 17,920 18,669 — — 40,462 41,869 Mortgage-backed securities of U.S. government sponsored entities 261,369 262,213 604,934 609,207 Private mortgage-backed securities and collateralized mortgage obligations — — 56,005 57,561 Collateralized loan obligations — — 239,364 238,218 Totals $ 261,369 $ 262,213 $ 940,765 $ 946,855
Summary of Investments Classified by Contractual Maturity	Securities not due at a single maturity date are shown separately. Held-to-Maturity Available-for-Sale (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in less than one year $ — $ — $ 3,472 $ 3,523 Due after one year through five years — — 8,582 8,698 Due after five years through ten years — — 10,488 10,979 Due after ten years — — 17,920 18,669 — — 40,462 41,869 Mortgage-backed securities of U.S. government sponsored entities 261,369 262,213 604,934 609,207 Private mortgage-backed securities and collateralized mortgage obligations — — 56,005 57,561 Collateralized loan obligations — — 239,364 238,218 Totals $ 261,369 $ 262,213 $ 940,765 $ 946,855
Schedule of Unrealized Loss and Fair Value on Investments	The tables below indicate the fair value of debt securities with unrealized losses and the period of time for which these losses were outstanding at December 31, 2019 and December 31, 2018 , respectively. December 31, 2019 Less than 12 months 12 months or longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities and obligations of U.S. government agencies $ 758 $ (4 ) $ — $ — $ 758 $ (4 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities 220,057 (1,461 ) 104,184 (1,923 ) 324,241 (3,384 ) Private mortgage-backed securities and collateralized mortgage obligations 2,978 (5 ) — — 2,978 (5 ) Collateralized loan obligations 88,680 (570 ) 110,767 (583 ) 199,447 (1,153 ) Obligations of state and political subdivisions 515 (1 ) — — 515 (1 ) Total temporarily impaired securities $ 312,988 $ (2,041 ) $ 214,951 $ (2,506 ) $ 527,939 $ (4,547 ) December 31, 2018 Less than 12 months 12 months or longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities and obligations of U.S. government agencies $ 99 $ (1 ) $ 642 $ (5 ) $ 741 $ (6 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities 200,184 (2,235 ) 623,420 (19,136 ) 823,604 (21,371 ) Private mortgage-backed securities and collateralized mortgage obligations 20,071 (344 ) 12,739 (187 ) 32,810 (531 ) Collateralized loan obligations 238,894 (4,319 ) — — 238,894 (4,319 ) Obligations of state and political subdivisions 19,175 (241 ) 9,553 (210 ) 28,728 (451 ) Total temporarily impaired securities $ 478,423 $ (7,140 ) $ 646,354 $ (19,538 ) $ 1,124,777 $ (26,678 )

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans	The following table outlines net loans balances by category as of: December 31, 2019 (In thousands) Portfolio Loans PCI Loans PULs Total Loans Construction and land development $ 281,335 $ 160 $ 43,618 $ 325,113 Commercial real estate 1,834,811 10,217 533,943 2,378,971 Residential real estate 1,304,305 1,710 201,848 1,507,863 Commercial and financial 697,301 579 80,372 778,252 Consumer 200,166 — 8,039 208,205 Total Loans 1 $ 4,317,918 $ 12,666 $ 867,820 $ 5,198,404 December 31, 2018 (In thousands) Portfolio Loans PCI Loans PULs Total Loans Construction and land development $ 301,473 $ 151 $ 141,944 $ 443,568 Commercial real estate 1,437,989 10,828 683,249 2,132,066 Residential real estate 1,055,525 2,718 266,134 1,324,377 Commercial and financial 603,057 737 118,528 722,322 Consumer 190,207 — 12,674 202,881 Total Loans 1 $ 3,588,251 $ 14,434 $ 1,222,529 $ 4,825,214 1 Loan balances at December 31, 2019 and 2018 include deferred costs of $19.9 million and $16.9 million, respectively.
Schedule of Past Due Financing Receivables	The following table presents the balances outstanding status by class of loans as of: December 31, 2019 Accruing 30-59 Days Accruing 60-89 Days Accruing Greater Than Total Financing (In thousands) Current Past Due Past Due 90 Days Nonaccrual Receivables Portfolio Loans Construction and land development $ 276,984 $ — $ — $ — $ 4,351 $ 281,335 Commercial real estate 1,828,629 1,606 220 — 4,356 1,834,811 Residential real estate 1,294,778 1,564 18 — 7,945 1,304,305 Commercial and financial 690,412 2,553 — 108 4,228 697,301 Consumer 199,424 317 315 — 110 200,166 Total Portfolio Loans 4,290,227 6,040 553 108 20,990 4,317,918 PULs Construction and land development 43,044 — — — 574 43,618 Commercial real estate 531,325 942 431 — 1,245 533,943 Residential real estate 201,159 277 — — 412 201,848 Commercial and financial 78,705 — — — 1,667 80,372 Consumer 8,039 — — — — 8,039 Total PULs 862,272 1,219 431 — 3,898 867,820 PCI Loans Construction and land development 148 — — — 12 160 Commercial real estate 9,298 — — — 919 10,217 Residential real estate 587 — — — 1,123 1,710 Commercial and financial 566 — — — 13 579 Consumer — — — — — — Total PCI Loans 10,599 — — — 2,067 12,666 Total Loans $ 5,163,098 $ 7,259 $ 984 $ 108 $ 26,955 $ 5,198,404 December 31, 2018 Accruing 30-59 Days Accruing 60-89 Days Accruing Greater Than Total Financing (In thousands) Current Past Due Past Due 90 Days Nonaccrual Receivables Portfolio Loans Construction and land development $ 301,348 $ 97 $ — $ — $ 28 $ 301,473 Commercial real estate 1,427,413 3,852 97 141 6,486 1,437,989 Residential real estate 1,044,375 2,524 525 295 7,806 1,055,525 Commercial and financial 594,930 5,186 1,661 — 1,280 603,057 Consumer 189,061 637 326 — 183 190,207 Total Portfolio Loans 3,557,127 12,296 2,609 436 15,783 3,588,251 PULs Construction and land development 140,013 1,931 — — — 141,944 Commercial real estate 680,060 1,846 — — 1,343 683,249 Residential real estate 260,781 1,523 — 90 3,740 266,134 Commercial and financial 116,173 342 — — 2,013 118,528 Consumer 12,643 — 31 — — 12,674 Total PULs 1,209,670 5,642 31 90 7,096 1,222,529 PCI Loans Construction and land development 135 — — — 16 151 Commercial real estate 8,403 1,034 — — 1,391 10,828 Residential real estate 556 — — — 2,162 2,718 Commercial and financial 74 635 — — 28 737 Consumer — — — — — — Total PCI Loans 9,168 1,669 — — 3,597 14,434 Total Loans $ 4,775,965 $ 19,607 $ 2,640 $ 526 $ 26,476 $ 4,825,214
Schedule of Risk Categories of Loans by Class of Loans	The following tables present the risk category of loans by class of loans based on the most recent analysis performed as of: December 31, 2019 (In thousands) Pass Special Mention Substandard Doubtful Total Net Loans Construction and land development $ 317,765 $ 2,235 $ 5,113 $ — $ 325,113 Commercial real estate 2,331,725 26,827 20,098 321 2,378,971 Residential real estate 1,482,278 7,364 18,221 — 1,507,863 Commercial and financial 755,957 11,925 9,496 874 778,252 Consumer 203,966 3,209 1,030 — 208,205 Total Net Loans $ 5,091,691 $ 51,560 $ 53,958 $ 1,195 $ 5,198,404 December 31, 2018 (In thousands) Pass Special Mention Substandard Doubtful Total Net Loans Construction and land development $ 428,044 $ 10,429 $ 5,095 $ — $ 443,568 Commercial real estate 2,063,589 41,429 27,048 — 2,132,066 Residential real estate 1,296,634 3,654 24,089 — 1,324,377 Commercial and financial 707,663 8,387 6,247 25 722,322 Consumer 198,367 3,397 1,117 — 202,881 Total Net Loans $ 4,694,297 $ 67,296 $ 63,596 $ 25 $ 4,825,214
Schedule of Changes in Accretable Yield on PCI Loans	The table below summarizes the changes in accretable yield on PCI loans for the years ended: December 31, (In thousands) 2019 2018 2017 Beginning balance $ 2,924 $ 3,699 $ 3,807 Additions — — 763 Deletions — (43 ) (11 ) Accretion (1,778 ) (1,291 ) (1,647 ) Reclassifications from non-accretable difference 703 559 787 Ending Balance $ 1,849 $ 2,924 $ 3,699
Schedule of Impaired Financing Receivables, Excluding PCI Loans and Valuation Allowance	of December 31, 2019 and 2018 , the Company’s recorded investment in impaired loans, excluding PCI loans, and related valuation allowance was as follows: December 31, 2019 Recorded Unpaid Principal Related Valuation (In thousands) Investment Balance Allowance Impaired Loans with No Related Allowance Recorded: Construction and land development $ 4,995 $ 5,186 $ — Commercial real estate 6,070 7,590 — Residential real estate 9,470 14,182 — Commercial and financial 3,485 4,475 — Consumer 111 125 — Impaired Loans with an Allowance Recorded: Construction and land development 62 78 14 Commercial real estate 4,196 4,196 220 Residential real estate 4,914 4,914 834 Commercial and financial 2,567 3,115 1,731 Consumer 226 239 59 Total Impaired Loans Construction and land development 5,057 5,264 14 Commercial real estate 10,266 11,786 220 Residential real estate 14,384 19,096 834 Commercial and financial 6,052 7,590 1,731 Consumer 337 364 59 Total Impaired Loans $ 36,096 $ 44,100 $ 2,858 December 31, 2018 Recorded Unpaid Principal Related Valuation (In thousands) Investment Balance Allowance Impaired Loans with No Related Allowance Recorded: Construction and land development $ 15 $ 229 $ — Commercial real estate 3,852 5,138 — Residential real estate 13,510 18,111 — Commercial and financial 1,191 1,414 — Consumer 280 291 — Impaired Loans with an Allowance Recorded: Construction and land development 196 211 22 Commercial real estate 9,786 12,967 369 Residential real estate 5,537 5,664 805 Commercial and financial 2,131 2,309 1,498 Consumer 202 211 34 Total Impaired Loans Construction and land development 211 440 22 Commercial real estate 13,638 18,105 369 Residential real estate 19,047 23,775 805 Commercial and financial 3,322 3,723 1,498 Consumer 482 502 34 Total Impaired Loans $ 36,700 $ 46,545 $ 2,728

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Allowance for Credit Losses on Financing Receivables	Activity in the allowance for loans losses for the three years ended December 31, 2019 , 2018 and 2017 is summarized as follows: (In thousands) Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance December 31, 2019 Construction and land development $ 2,233 $ (421 ) $ — $ 31 $ (1 ) $ 1,842 Commercial real estate 11,112 1,677 (248 ) 744 (61 ) 13,224 Residential real estate 7,775 (231 ) (152 ) 338 (63 ) 7,667 Commercial and financial 8,585 7,969 (7,550 ) 712 — 9,716 Consumer 2,718 2,005 (2,609 ) 595 (4 ) 2,705 Total $ 32,423 $ 10,999 $ (10,559 ) $ 2,420 $ (129 ) $ 35,154 December 31, 2018 Construction and land development $ 1,642 $ 564 $ — $ 27 $ — $ 2,233 Commercial real estate 9,285 4,736 (3,139 ) 292 (62 ) 11,112 Residential real estate 7,131 29 (80 ) 816 (121 ) 7,775 Commercial and financial 7,297 4,359 (3,396 ) 325 — 8,585 Consumer 1,767 2,042 (1,411 ) 329 (9 ) 2,718 Total $ 27,122 $ 11,730 $ (8,026 ) $ 1,789 $ (192 ) $ 32,423 December 31, 2017 Construction and land development $ 1,219 $ (471 ) $ — $ 896 $ (2 ) $ 1,642 Commercial real estate 9,273 (264 ) (407 ) 747 (64 ) 9,285 Residential real estate 7,483 125 (569 ) 336 (244 ) 7,131 Commercial and financial 3,636 5,304 (1,869 ) 226 — 7,297 Consumer 1,789 954 (1,257 ) 290 (9 ) 1,767 Total $ 23,400 $ 5,648 $ (4,102 ) $ 2,495 $ (319 ) $ 27,122
Loan Portfolio and Related Allowance	The table below summarizes PCI loans that were individually evaluated for impairment based on expected cash flows at December 31, 2019 and 2018 . December 31, 2019 December 31, 2018 PCI Loans Individually Evaluated for Impairment PCI Loans Individually Evaluated for Impairment (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction and land development $ 160 $ — $ 151 $ — Commercial real estate 10,217 — 10,828 — Residential real estate 1,710 — 2,718 — Commercial and financial 579 — 737 — Consumer — — — — Total $ 12,666 $ — $ 14,434 $ — December 31, 2019 and 2018 is shown in the following tables. December 31, 2019 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction and land development $ 5,057 $ 14 $ 319,896 $ 1,828 $ 324,953 $ 1,842 Commercial real estate 10,267 220 2,358,487 13,004 2,368,754 13,224 Residential real estate 14,383 834 1,491,770 6,833 1,506,153 7,667 Commercial and financial 6,052 1,731 771,621 7,985 777,673 9,716 Consumer 337 59 207,868 2,646 208,205 2,705 Total $ 36,096 $ 2,858 $ 5,149,642 $ 32,296 $ 5,185,738 $ 35,154 December 31, 2018 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction and land development $ 211 $ 22 $ 443,206 $ 2,211 $ 443,417 $ 2,233 Commercial real estate 13,638 369 2,107,600 10,743 2,121,238 11,112 Residential real estate 19,047 805 1,302,612 6,970 1,321,659 7,775 Commercial and financial 3,322 1,498 718,263 7,087 721,585 8,585 Consumer 482 34 202,399 2,684 202,881 2,718 Total $ 36,700 $ 2,728 $ 4,774,080 $ 29,695 $ 4,810,780 $ 32,423

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	Bank premises and equipment as of: (In thousands) Cost Accumulated Depreciation & Amortization Net Carrying Value December 31, 2019 Premises (including land of $18,546) $ 83,020 $ (26,180 ) $ 56,840 Furniture and equipment 37,364 (27,589 ) 9,775 Total $ 120,384 $ (53,769 ) $ 66,615 December 31, 2018 Premises (including land of $18,546) $ 85,027 $ (26,107 ) $ 58,920 Furniture and equipment 36,892 (24,788 ) 12,104 Total $ 121,919 $ (50,895 ) $ 71,024

Goodwill and Acquired Intangi_2

Goodwill and Acquired Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table presents changes in the carrying amount of goodwill: For the Year Ended December 31, (In thousands) 2019 2018 2017 Beginning of year $ 204,753 $ 147,578 $ 64,649 Changes from business combinations 533 57,175 82,929 Total $ 205,286 $ 204,753 $ 147,578
Acquired intangible assets consist of core deposit intangibles	The change in balance for CDI is as follows: For the Year Ended December 31, (In thousands) 2019 2018 2017 Beginning of year $ 24,807 $ 18,937 $ 14,572 Acquired CDI, including measurement period adjustments (676 ) 10,170 7,726 Amortization expense (5,826 ) (4,300 ) (3,361 ) End of year $ 18,305 $ 24,807 $ 18,937 (In months) Remaining average amortization period for CDI 47 58 63
Gross Carrying Amount and Accumulated Amortization of Intangible Asset	The gross carrying amount and accumulated amortization of the Company's CDI subject to amortization as of: December 31, 2019 December 31, 2018 (In thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Deposit base $ 36,015 $ (17,710 ) $ 36,691 $ (11,884 )

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	A significant portion of the Company's short-term borrowings were comprised of securities sold under agreements to repurchase with overnight maturities : For the Year Ended December 31, (In thousands) 2019 2018 2017 Maximum amount outstanding at any month end $ 193,388 $ 341,213 $ 216,094 Weighted average interest rate at end of year 1.17 % 1.14 % 0.71 % Average amount outstanding $ 106,142 $ 200,839 $ 171,686 Weighted average interest rate during the year 1.35 % 0.90 % 0.46 %
Schedule of Collateral Type and Maturity	Company securities pledged were as follows by collateral type and maturity as of: December 31, (In thousands) 2019 2018 2017 Fair value of pledged securities - overnight and continuous: Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities $ 94,354 $ 246,829 $ 248,654
Schedule of Junior Subordinated Debentures and Related Trust Preferred and Common Equity Securities	The following table summarizes the Company's junior subordinated debentures and related trust preferred and common equity securities as of December 31, 2019 : (In thousands) Description Issuance Date Acquisition Date 1 Maturity Date Junior Subordinated Debt Trust Preferred Securities Common Equity Securities Contractual Interest Rate Interest Rate at December 31, 2019 SBCF Capital Trust I 3/31/2005 n/a 3/31/2035 $ 20,619 $ 20,000 $ 619 3 month LIBOR +175bps 3.69% SBCF Statutory Trust II 12/16/2005 n/a 12/16/2035 20,619 20,000 619 3 month LIBOR +133bps 3.22% SBCF Statutory Trust III 6/29/2007 n/a 6/15/2037 12,372 12,000 372 3 month LIBOR +135bps 3.24% BANKshares, Inc. Statutory Trust I 12/19/2002 10/1/2014 12/26/2032 5,155 5,000 155 3 month LIBOR +325bps 5.20% BANKshares, Inc. Statutory Trust II 3/17/2004 10/1/2014 3/17/2034 4,124 4,000 124 3 month LIBOR +279bps 4.69% BANKshares, Inc. Capital Trust I 12/15/2005 10/1/2014 12/15/2035 5,155 5,000 155 3 month LIBOR +139bps 3.30% Grand Bank Capital Trust I 10/29/2004 7/17/2015 10/29/2034 7,217 7,000 217 3 month LIBOR +198bps 3.94% $ 75,261 $ 73,000 $ 2,261 1 Acquired junior subordinated debentures were recorded at their acquisition date fair values, which collectively was $5.6 million lower than face value; this amount is being amortized into interest expense over the remaining term to maturity.

Employee Benefits and Stock C_2

Employee Benefits and Stock Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Schedule of Share-Based Compensation	The impact of share-based compensation on the Company’s financial results is presented below: For the Year Ended December 31, (In thousands) 2019 2018 2017 Share-based compensation expense $ 7,244 $ 7,823 5,267 Income tax benefit (1,723 ) (1,911 ) (1,966 )
Schedule of Unrecognized Compensation Cost, Nonvested Awards	The total unrecognized compensation cost and the weighted-average period over which unrecognized compensation cost is expected to be recognized related to non-vested share-based compensation arrangements at December 31, 2019 is presented below: (In thousands) Unrecognized Compensation Cost Weighted-Average Period Remaining (Years) Restricted stock awards $ 3,577 1.6 Restricted stock units 3,921 1.7 Stock options 697 0.9 Total $ 8,195 1.6
Schedule of Nonvested Share Activity	A summary of the status of the Company’s non-vested RSAs as of December 31, 2019 , and changes during the year then ended, is presented below: Restricted Award Shares Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2019 295,130 $ 24.09 Granted 157,861 26.86 Forfeited/Canceled (63,666 ) 25.83 Vested (175,374 ) 23.54 Non-vested at December 31, 2019 213,951 26.07 A summary of the status of the Company’s non-vested RSUs as of December 31, 2019 , and changes during the year then ended, is presented below: Restricted Award Shares Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2019 503,111 $ 19.69 Granted 75,002 30.02 Forfeited/Canceled (8,242 ) 20.29 Vested (187,941 ) 15.24 Non-vested at December 31, 2019 381,930 23.89
Schedule of Restricted Stock and Restricted Stock Units Activity	Information regarding restricted stock awards during each of the following years is presented below: Year Ended December 31, 2019 2018 2017 Shares granted 157,861 242,613 114,331 Weighted-average grant date fair value $ 26.86 $ 26.48 $ 24.08 Fair value of awards vested 1 $ 4,128 $ 2,515 $ 1,407 1 Based on grant date fair value, in thousands For the Year Ended December 31, 2019 2018 2017 Shares granted 75,002 173,193 164,268 Weighted-average grant date fair value $ 30.02 $ 24.02 $ 23.94 Fair value of awards vested 1 $ 2,864 $ 1,095 $ 937 1 Based on grant date fair value
Schedule of Stock Option Valuation Assumptions	The Company estimated the fair value of each option grant on the date of grant using the Black-Scholes options-pricing model with the following weighted-average assumptions: For the Year Ended December 31, 2019 2018 2017 Risk-free interest rates 2.53 % 2.56 % 1.85 % Expected dividend yield — % — % — % Expected volatility 34.5 % 26.6 % 25.4 % Expected lives (years) 5.0 5.0 5.0
Schedule of Stock Options Roll Forward	A summary of the Company’s stock options as of December 31, 2019 , and changes during the year then ended, are presented below: Options Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (000s) Outstanding at January 1, 2019 933,495 $ 22.00 Granted 3,438 28.42 Exercised (28,824 ) 14.86 Forfeited (4,330 ) 29.17 Outstanding at December 31, 2019 903,779 22.22 6.14 $ 7,669 Exercisable at December 31, 2019 633,561 19.82 5.65 6,848
Schedule of Stock Option Activity	nformation related to stock options during each of the following years: For the Year Ended December 31, 2019 2018 2017 Options granted 3,438 219,118 297,576 Weighted-average grant date fair value $ 28.42 $ 5.65 $ 4.66 Intrinsic value of stock options exercised 277 3,045 1,143
Schedule of Options Outstanding and Remaining Contractual Life of Stock Options	The following table summarizes information related to stock options as of December 31, 2019 : Range of Exercise Prices Options Outstanding Remaining Contractual Life (Years) Options Exercisable Weighted Average Exercise Price $10.54 to $14.82 368,611 4.2 334,016 $ 12.42 $15.99 to $28.69 326,909 7.1 229,824 27.16 $31.15 to $31.15 208,259 8.2 69,721 31.15 Total 903,779 6.1 633,561 $ 19.82
Schedule of Employee Stock Purchase Plan Activity	Employee contributions to the ESPP are made through payroll deductions. 2019 2018 2017 ESPP shares purchased 16,320 15,225 12,434 Weighted-average employee purchase price $ 25.39 $ 26.85 $ 22.67

Lease Commitments (Tables)

Lease Commitments (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Schedule of Supplemental Lease Cost Information Related to Operating Leases	Lease cost for the year ended December 31, 2019 consists of: (In thousands) For the Year Ended December 31, 2019 Operating lease cost $ 5,570 Variable lease cost 1,211 Short-term lease cost 715 Sublease income (618 ) Total lease cost $ 6,878
Schedule of Supplemental Balance Sheet Information Related to Operating Leases	The following table provides supplemental information related to leases as of and for the year ended December 31, 2019 : (In thousands, except for weighted average data) December 31, 2019 Operating lease right-of-use assets $ 26,165 Operating lease liabilities 30,098 Cash paid for amounts included in the measurement of operating lease liabilities 5,936 Right-of-use assets obtained in exchange for new operating lease obligations 1,224 Weighted average remaining lease term for operating leases 8.5 years Weighted average discount rate for operating leases 4.70 %
Schedule of Maturities of Lease Liabilities	Maturities of lease liabilities as of December 31, 2019 are as follows: For the Year Ended December 31, 2019 (In thousands) 2020 $ 5,626 2021 4,965 2022 4,436 2023 3,725 2024 3,734 Thereafter 14,498 Total undiscounted cash flows 36,984 Less: Net present value adjustment (6,886 ) Total $ 30,098

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The provision for income taxes is as follows: For the Year Ended December 31, (In thousands) 2019 2018 2017 Current Federal $ 20,954 $ 9,078 $ 667 State 1,932 — 2 Deferred Federal 2,808 7,018 32,791 State 4,179 4,163 2,876 $ 29,873 $ 20,259 $ 36,336
Schedule of Effective Income Tax Rate Reconciliation	The difference between the total expected tax expense (computed by applying the U.S. Federal tax rate of 21% to pretax income in 2019 and 2018 and 35% in 2017 ) and the reported income tax provision relating to income before income taxes is as follows: For the Year Ended December 31, (In thousands) 2019 2018 2017 Tax rate applied to income before income taxes $ 27,008 $ 18,381 $ 27,720 Increase (decrease) resulting from the effects of: Tax law change — — 8,552 Nondeductible acquisition costs 125 207 657 Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance (1,282 ) (667 ) (1,445 ) State income taxes (1,283 ) (874 ) (1,007 ) Tax credit investments (72 ) (33 ) (165 ) Stock compensation (698 ) (918 ) (1,027 ) Other (36 ) — 173 Federal tax provision 23,762 16,096 33,458 State tax provision 6,111 4,163 2,878 Total income tax provision $ 29,873 $ 20,259 $ 36,336
Schedule of Deferred Tax Assets and Liabilities	The net deferred tax assets (liabilities) are comprised of the following as of: December 31, (In thousands) 2019 2018 Allowance for loan losses $ 8,949 $ 8,592 Premises and equipment — 1,670 Other real estate owned 8 207 Accrued stock compensation 2,406 2,547 Federal tax loss carryforward 3,601 4,699 State tax loss carryforward 1,110 2,912 Alternative minimum tax credit carryforward 530 — Lease liabilities 7,381 — Net unrealized securities losses — 4,658 Deferred compensation 2,458 2,287 Accrued interest and fee income 3,106 7,674 Other 378 1,627 Gross deferred tax assets 29,927 36,873 Less: Valuation allowance — — Deferred tax assets net of valuation allowance 29,927 36,873 Core deposit base intangible (4,005 ) (5,706 ) Net unrealized securities gains (1,210 ) — Premises and equipment (114 ) — Right of use assets (6,416 ) — Other (1,725 ) (2,213 ) Gross deferred tax liabilities (13,470 ) (7,919 ) Net deferred tax assets $ 16,457 $ 28,954
Summary of Income Tax Examinations	The following are the major tax jurisdictions in which the Company operates and the earliest tax year, exclusive of the impact of the net operating loss carryforwards, subject to examination: Jurisdiction Tax Year United States of America 2016 Florida 2016

Noninterest Income and Expens_2

Noninterest Income and Expenses (Tables)	12 Months Ended
	Dec. 31, 2019
Brokers and Dealers [Abstract]
Summary of Noninterest Income and Expense	Details of noninterest income and expense are as follows: For the Year Ended December 31, (In thousands) 2019 2018 2017 Noninterest Income Service charges on deposit accounts $ 11,529 $ 11,198 $ 10,049 Trust fees 4,443 4,183 3,705 Mortgage banking fees 6,490 4,682 6,449 Brokerage commissions and fees 1,909 1,732 1,352 Marine finance fees 1,054 1,398 910 Interchange income 13,399 12,335 10,583 BOLI income 3,674 4,291 3,426 SBA gains 2,472 2,474 579 Other 10,545 8,352 6,177 55,515 50,645 43,230 Gain on sale of Visa stock — — 15,153 Securities gains (losses), net 1,217 (623 ) 86 Total Noninterest Income $ 56,732 $ 50,022 $ 58,469 Noninterest Expenses Salaries and wages 73,829 71,111 65,692 Employee benefits 13,697 12,945 11,732 Outsourced data processing costs 15,077 16,374 14,116 Telephone and data lines 2,958 2,481 2,291 Occupancy 14,284 13,394 13,290 Furniture and equipment 6,245 6,744 6,067 Marketing 4,161 5,085 4,784 Legal and professional fees 8,553 9,961 11,022 FDIC assessments 881 2,195 2,326 Amortization of intangibles 5,826 4,300 3,361 Foreclosed property expense and net loss (gain) on sale 51 461 (300 ) Other 15,177 17,222 15,535 Total Noninterest Expenses $ 160,739 $ 162,273 $ 149,916

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Summary of Required Regulatory Capital	At December 31, 2019 and 2018 , the Company and Seacoast Bank, its wholly-owned banking subsidiary, were both considered "well capitalized" based on the applicable U.S. regulatory capital ratio requirements as reflected in the table below: Minimum to meet "Well Capitalized" Requirements Minimum for Capital Adequacy Purpose 1 (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Seacoast Banking Corporation of Florida (Consolidated) At December 31, 2019: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 860,934 15.71 % n/a n/a $ 438,506 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 825,640 15.06 n/a n/a 328,880 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 754,555 13.77 n/a n/a 246,660 ≥ 4.50 Leverage Ratio (to adjusted average assets) 825,640 12.20 n/a n/a 270,788 ≥ 4.00 At December 31, 2018: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 744,687 14.43 % n/a n/a $ 412,754 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 712,144 13.80 n/a n/a 309,566 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 641,340 12.43 n/a n/a 232,174 ≥ 4.50 Leverage Ratio (to adjusted average assets) 712,144 11.16 n/a n/a 255,167 ≥ 4.00 Seacoast National Bank (A Wholly Owned Bank Subsidiary) At December 31, 2019: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 804,058 14.68 % $ 547,440 ≥ 10.00 % $ 437,952 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 768,764 14.04 437,952 ≥ 8.00 328,464 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 768,764 14.04 355,836 ≥ 6.50 246,348 ≥ 4.50 Leverage Ratio (to adjusted average assets) 768,764 11.38 337,787 ≥ 5.00 270,230 ≥ 4.00 At December 31, 2018: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 701,093 13.60 % $ 515,607 ≥ 10.00 % $ 412,486 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 668,550 12.97 412,486 ≥ 8.00 309,364 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 668,550 12.97 335,145 ≥ 6.50 232,023 ≥ 4.50 Leverage Ratio (to adjusted average assets) 668,550 10.49 318,795 ≥ 5.00 255,036 ≥ 4.00 1 Excludes the Basel III capital conservation buffer of 2.5% for 2019 and 1.875% for 2018, which if not exceeded may constrain dividends, equity repurchases and compensation. n/a - not applicable

Seacoast Banking Corporation _2

Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information (Tables)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Summary of Balance Sheet	Balance Sheets December 31, (In thousands) 2019 2018 Assets Cash $ 70 $ 197 Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days 52,979 40,130 Investment in subsidiaries 1,005,756 897,683 Other assets 1,515 777 $ 1,060,320 $ 938,787 Liabilities and Shareholders' Equity Subordinated debt $ 71,085 $ 70,804 Other liabilities 3,700 3,716 Shareholders' equity 985,535 864,267 $ 1,060,320 $ 938,787
Summary of Statements of Income (Loss)	Statements of Income (Loss) Year Ended December 31, (In thousands) 2019 2018 2017 Income Interest/other $ 679 $ 484 $ 2,104 Dividends from subsidiary Bank — — — Gain on sale of Visa Class B stock — — 15,153 679 484 17,257 Interest expense 3,368 3,165 2,499 Other expenses 651 879 649 (Loss) income before income taxes and equity in undistributed income of subsidiaries (3,340 ) (3,560 ) 14,109 Income tax (benefit) provision (702 ) (747 ) 4,938 (Loss) Income before equity in undistributed income of subsidiaries (2,638 ) (2,813 ) 9,171 Equity in undistributed income of subsidiaries 101,377 70,088 33,694 Net income $ 98,739 $ 67,275 $ 42,865
Summary of Statement of Cash Flows	Statements of Cash Flows Year Ended December 31, (In thousands) 2019 2018 2017 Cash flows from operating activities Adjustments to reconcile net income to net cash provided by operating activities: Net Income $ 98,739 $ 67,275 $ 42,865 Equity in undistributed income of subsidiaries (101,377 ) (70,088 ) (33,694 ) Gain on sale of Visa Class B stock — — (15,153 ) Net (increase) decrease in other assets (738 ) (10,045 ) 1,415 Net increase (decrease) in other liabilities 265 (3,431 ) 4,005 Net cash provided by (used in) operating activities (3,111 ) (16,289 ) (562 ) Cash flows from investing activities Net cash paid for bank acquisition — (6,558 ) (27,862 ) Investment in unconsolidated subsidiary (10 ) — — Purchase of Visa Class B stock — — (6,180 ) Proceeds from sale of Visa Class B stock — 21,333 — Dividends from bank subsidiary 18,082 — — (Increase) decrease in securities purchased under agreement to resell, maturing within 30 days, net (12,849 ) (421 ) (20,475 ) Net cash provided by (used in) investment activities 5,223 14,354 (54,517 ) Cash flows from financing activities Issuance of common stock, net of related expense — — 55,641 Stock based employment benefit plans (2,239 ) 978 (56 ) Net cash provided by financing activities (2,239 ) 978 55,585 Net change in cash (127 ) (957 ) 506 Cash at beginning of year 197 1,154 648 Cash at end of year $ 70 $ 197 $ 1,154 Supplemental disclosure of cash flow information: Cash paid during the period for interest $ 3,186 $ 2,936 $ 2,205

Contingent Liabilities and Co_2

Contingent Liabilities and Commitments with Off-Balance Sheet Risk (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Summary of Financial Instruments with Off-Balance-Sheet Risk	Unfunded commitments for the Company as of: December 31, (In thousands) 2019 2018 Contract or Notional Amount Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ 1,018,020 $ 982,739 Standby letters of credit and financial guarantees written: Secured 13,073 17,736 Unsecured 663 847 Unfunded limited partner equity commitment 6,011 7,252

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis	Under ASC Topic 820, fair value measurements for items measured at fair value on a recurring and nonrecurring basis at December 31, 2019 and December 31, 2018 included: Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs (In thousands) Measurements Level 1 Level 2 Level 3 At December 31, 2019 Available-for-sale debt securities 1 $ 946,855 $ 100 $ 946,755 $ — Loans held for sale 2 20,029 — 20,029 — Loans 3 5,123 — 1,419 3,704 Other real estate owned 4 12,390 — 241 12,149 Equity securities 5 6,392 6,392 — — At December 31, 2018 Available-for-sale debt securities 1 $ 865,831 $ 100 $ 865,731 $ — Loans held for sale 2 11,873 — 11,873 — Loans 3 8,590 — 2,290 6,300 Other real estate owned 4 12,802 — 297 12,505 Equity securities 5 6,205 6,205 — — 1 See Note D for further detail of fair value of individual investment categories. 2 Recurring fair value basis determined using observable market data. 3 See Note E. Nonrecurring fair value adjustments to loans identified as impaired reflect full or partial write- downs that are based on the loan’s observable market price or current appraised value of the collateral in accordance with ASC Topic 310. 4 Fair value is measured on a nonrecurring basis in accordance with ASC Topic 360. 5 An investment in shares of a mutual fund that invests primarily in CRA-qualified debt securities, reported at fair value in Other Assets. Recurring fair value basis is determined using market quotations.
Schedule of Contractual Balance and Gains or Losses	The aggregate fair value and contractual balance of loans held for sale as of December 31, 2019 and 2018 is as follows: December 31, (In thousands) 2019 2018 Aggregate fair value $ 20,029 $ 11,873 Contractual balance 19,445 11,562 Excess 584 311
Fair Value Measurements, Recurring and Nonrecurring	The carrying amount and fair value of the Company's other significant financial instruments that were not disclosed previously in the balance sheet and for which carrying amount is not fair value as of December 31, 2019 and December 31, 2018 is as follows: Carrying Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs (In thousands) Amount Level 1 Level 2 Level 3 At December 31, 2019 Financial Assets Debt securities held-to-maturity 1 $ 261,369 $ — $ 262,213 $ — Time deposits with other banks 3,742 — — 3,744 Loans, net 5,158,127 — — 5,139,491 Financial Liabilities Deposits 5,584,753 — — 5,584,621 Federal Home Loan Bank (FHLB) borrowings 315,000 — — 314,995 Subordinated debt 71,085 — 64,017 — At December 31, 2018 Financial Assets Debt securities held-to-maturity 1 $ 357,949 $ — $ 349,895 $ — Time deposits with other banks 8,243 — — 8,132 Loans, net 4,784,201 — — 4,835,248 Financial Liabilities Deposits 5,177,240 — — 5,172,098 Federal Home Loan Bank (FHLB) borrowings 380,000 — — 380,027 Subordinated debt 70,804 — 61,224 — 1 See Note D for further detail of recurring fair value basis of individual investment categories.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	In 2019 , 2018 , and 2017 , options to purchase 491,000 , 483,000 , and 274,000 shares, respectively, were antidilutive and accordingly were excluded in determining diluted earnings per share. For the Year Ended December 31 (In thousands, except per share data) 2019 2018 2017 Basic earnings per share Net Income $ 98,739 $ 67,275 $ 42,865 Total weighted average common stock outstanding 51,449 47,969 42,613 Net income per share $ 1.92 $ 1.40 $ 1.01 Diluted earnings per share Net Income $ 98,739 $ 67,275 $ 42,865 Total weighted average common stock outstanding 51,449 47,969 42,613 Add: Dilutive effect of employee restricted stock and stock options (See Note J) 580 779 737 Total weighted average diluted stock outstanding 52,029 48,748 43,350 Net income per share $ 1.90 $ 1.38 $ 0.99

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Summary of Purchase Price Calculation	The Company acquired 100% of the outstanding common stock of NorthStar . Under the terms of the definitive agreement, NorthStar shareholders received, for each share of NorthStar common stock, the combination of $2.40 in cash and 0.5605 shares of Seacoast common stock (based on Seacoast’s closing price of $24.92 per share on October 20, 2017). (In thousands, except per share data) October 20, 2017 Shares exchanged for cash $ 4,701 Number of NorthStar Banking Corporation common shares outstanding 1,958 Per share exchange ratio 0.5605 Number of shares of common stock issued 1,098 Multiplied by common stock price per share on October 20, 2017 $ 24.92 Value of common stock issued 27,353 Cash paid for NorthStar Banking Corporation vested stock options 801 Total purchase price $ 32,855 The Company acquired 100% of the outstanding common stock of PBCB . Under the terms of the definitive agreement, PBCB shareholders received, for each share of PBCB common stock, the combination of $6.26 in cash and 0.9240 shares of Seacoast common stock (based on Seacoast’s closing price of $24.31 per share on November 3, 2017). (In thousands, except per share data) November 3, 2017 Shares exchanged for cash $ 15,694 Number of Palm Beach Community Bank common shares outstanding 2,507 Per share exchange ratio 0.9240 Number of shares of common stock issued 2,316 Multiplied by common stock price per share on November 3, 2017 $ 24.31 Value of common stock issued 56,312 Total purchase price $ 72,006 0.7324 shares of Seacoast common stock. (In thousands, except per share data) October 19, 2018 Number of First Green common shares outstanding 5,462 Per share exchange ratio 0.7324 Number of shares of common stock issued 4,000 Multiplied by common stock price per share on October 19, 2018 $ 26.87 Value of common stock issued 107,486 Cash paid for First Green vested stock options 6,558 Total purchase price $ 114,044 The Company acquired 100% of the outstanding common stock of GulfShore . Under the terms of the definitive agreement, GulfShore shareholders received, for each share of GulfShore common stock, the combination of $1.47 in cash and 0.4807 shares of Seacoast common stock (based on Seacoast’s closing price of $23.94 per share on April 7, 2017). (In thousands, except per share data) April 7, 2017 Shares exchanged for cash $ 8,034 Number of GulfShore Bancshares, Inc. common shares outstanding 5,464 Per share exchange ratio 0.4807 Number of shares of common stock issued 2,627 Multiplied by common stock price per share on April 7, 2017 $ 23.94 Value of common stock issued 62,883 Total purchase price $ 70,917
Schedule of Business Acquisitions	The adjustments reflected in the table below are the result of information obtained subsequent to the initial measurement. (In thousands) Initially Measured October 20, 2017 Measurement Period Adjustments As Adjusted October 20, 2017 Assets: Cash $ 5,485 $ — $ 5,485 Investment securities 56,123 — 56,123 Loans, net 136,832 — 136,832 Fixed assets 2,637 — 2,637 Core deposit intangibles 1,275 — 1,275 Goodwill 12,404 (99 ) 12,305 Other assets 1,522 99 1,621 Total assets $ 216,278 $ — $ 216,278 Liabilities: Deposits $ 182,443 $ — $ 182,443 Other liabilities 980 — 980 Total liabilities $ 183,423 $ — $ 183,423 (In thousands) April 7, 2017 Assets: Cash $ 38,267 Time deposits with other banks 17,273 Investment securities 316 Loans, net 250,876 Fixed assets 1,307 Other real estate owned 13 Core deposit intangibles 3,927 Goodwill 37,098 Other assets 8,572 Total assets $ 357,649 Liabilities: Deposits $ 285,350 Other liabilities 1,382 Total liabilities $ 286,732 (In thousands) Initially Measured October 19, 2018 Measurement Period Adjustments As Adjusted October 19, 2018 Assets: Cash $ 29,434 $ — $ 29,434 Investment securities 32,145 — 32,145 Loans, net 631,497 — 631,497 Fixed assets 16,828 — 16,828 Other real estate owned 410 — 410 Core deposit intangibles 10,170 (676 ) 9,494 Goodwill 56,198 533 56,731 Other assets 40,669 178 40,847 Total assets $ 817,351 $ 35 $ 817,386 Liabilities: Deposits $ 624,289 $ — $ 624,289 Other liabilities 79,018 35 79,053 Total liabilities $ 703,307 $ 35 $ 703,342 (In thousands) Initially Measured November 3, 2017 Measurement Period Adjustments As Adjusted November 3, 2017 Assets: Cash $ 9,301 $ — $ 9,301 Investment securities 22,098 — 22,098 Loans, net 272,090 (1,772 ) 270,318 Fixed assets 7,641 — 7,641 Core deposit intangibles 2,523 — 2,523 Goodwill 33,428 1,076 34,504 Other assets 9,909 696 10,605 Total assets $ 356,990 $ — $ 356,990 Liabilities: Deposits $ 268,633 $ — $ 268,633 Other liabilities 16,351 — 16,351 Total liabilities $ 284,984 $ — $ 284,984
Schedule 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. April 7, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 101,281 $ 99,598 Commercial real estate 106,729 103,905 Construction/development/land 13,175 11,653 Commercial loans 32,137 32,247 Consumer and other loans 3,554 3,473 Purchased credit-impaired — — Total acquired loans $ 256,876 $ 250,876 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. October 19, 2018 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 101,674 $ 101,119 Commercial real estate 437,767 406,613 Construction/development/land 61,195 58,385 Commercial loans 56,288 54,973 Consumer and other loans 9,156 8,942 Purchased credit-impaired 2,136 1,465 Total acquired loans $ 668,216 $ 631,497 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. November 3, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 30,153 $ 30,990 Commercial real estate 134,705 132,089 Construction/development/land 69,686 67,425 Commercial loans 36,076 35,876 Consumer and other loans 179 172 Purchased credit-impaired 4,768 3,766 Total acquired loans $ 275,567 $ 270,318 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. October 20, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 15,111 $ 15,096 Commercial real estate 73,139 69,554 Construction/development/land 11,706 10,390 Commercial loans 31,200 30,854 Consumer and other loans 6,761 6,645 Purchased credit-impaired 5,527 4,293 Total acquired loans $ 143,444 $ 136,832
Schedule of Contractually Required Principal and Interest Payments Adjusted for Estimated Prepayments	Contractually required principal and interest payments have been adjusted for estimated prepayments. (In thousands) October 19, 2018 Contractually required principal and interest $ 2,136 Non-accretable difference (671 ) Cash flows expected to be collected 1,465 Accretable yield — Total purchased credit-impaired loans acquired $ 1,465 (In thousands) October 20, 2017 Contractually required principal and interest $ 5,596 Non-accretable difference (689 ) Cash flows expected to be collected 4,907 Accretable yield (614 ) Total purchased credit-impaired loans acquired $ 4,293 (In thousands) November 3, 2017 Contractually required principal and interest $ 4,768 Non-accretable difference (1,002 ) Cash flows expected to be collected 3,766 Accretable yield — Total purchased credit-impaired loans acquired $ 3,766
Summary of Pro-Forma Data including Acquisition of Gulfshore, NSBC and PBCB	Pro-forma data as of 2018 and 2017 present information as if the acquisitions of GulfShore, NorthStar, PBCB, and First Green occurred at the beginning of 2017 : Twelve Months Ended December 31, (In thousands, except per share data) 2018 2017 Net interest income $ 238,498 $ 223,508 Net income available to common shareholders 82,307 62,188 EPS - basic $ 1.61 $ 1.24 EPS - diluted $ 1.58 $ 1.22

Significant Accounting Polici_4

Significant Accounting Policies - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)operating_segmentcommercial_banking_centerstraditional_bank_offices	Jan. 01, 2019USD ($)
Accounting Policies [Line Items]
Number of operating segments | operating_segment	1
Number of traditional bank offices | traditional_bank_offices	48
Number of commercial banking centers | commercial_banking_centers	9
Modified loan terms	6 months
Number of days past due	90 days
Number of days past due, consumer loans	120 days
Operating lease right-of-use assets	$ 26,165
Operating lease liabilities	$ 30,098
Stock Option
Accounting Policies [Line Items]
Vesting period	5 years
Minimum | Core Deposits
Accounting Policies [Line Items]
Intangible assets, useful life	6 years
Maximum | Core Deposits
Accounting Policies [Line Items]
Intangible assets, useful life	8 years
Building | Minimum
Accounting Policies [Line Items]
Bank premises and equipment, useful life	25 years
Building | Maximum
Accounting Policies [Line Items]
Bank premises and equipment, useful life	40 years
Leasehold Improvements | Minimum
Accounting Policies [Line Items]
Bank premises and equipment, useful life	5 years
Leasehold Improvements | Maximum
Accounting Policies [Line Items]
Bank premises and equipment, useful life	25 years
Furniture and Equipment | Minimum
Accounting Policies [Line Items]
Bank premises and equipment, useful life	3 years
Furniture and Equipment | Maximum
Accounting Policies [Line Items]
Bank premises and equipment, useful life	12 years
Accounting Standards Update 2016-02
Accounting Policies [Line Items]
Operating lease right-of-use assets		$ 29,000
Operating lease liabilities		33,000
Operating lease right-of-use assets acquired		$ 4,000

Significant Accounting Polici_5

Significant Accounting Policies - Schedule of Reclassification of Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 940,765		$ 882,872
Securities available-for-sale (at fair value)	946,855		865,831
Accounting Standards Update 2017-12
Debt Securities, Available-for-sale [Line Items]
Amortized cost		$ 53,526
Net unrealized gain (loss) reflected in OCI		(730)
Securities available-for-sale (at fair value)		52,796
Private mortgage-backed securities and collateralized mortgage obligations | Accounting Standards Update 2017-12
Debt Securities, Available-for-sale [Line Items]
Amortized cost		21,526
Net unrealized gain (loss) reflected in OCI		147
Securities available-for-sale (at fair value)		21,673
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	239,364		212,807
Securities available-for-sale (at fair value)	$ 238,218		$ 209,366
Collateralized loan obligations | Accounting Standards Update 2017-12
Debt Securities, Available-for-sale [Line Items]
Amortized cost		32,000
Net unrealized gain (loss) reflected in OCI		(877)
Securities available-for-sale (at fair value)		$ 31,123

Recently Issued Accounting St_2

Recently Issued Accounting Standards, Not Adopted at December 31, 2019 (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for loan losses		$ 35,154	$ 32,423	$ 27,122	$ 23,400
Ratio percentage of allowance to total loans		0.68%
Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in tier one capital ratio	0.32%
Minimum | Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for loan losses	$ 19,000
Ratio percentage of allowance to total loans	1.06%
Maximum | Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for loan losses	$ 23,000
Ratio percentage of allowance to total loans	1.12%

Cash, Dividend and Loan Restr_2

Cash, Dividend and Loan Restrictions - Additional Information (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Cash, Dividend and Loan Restrictions [Abstract]
Average amount of reserve balances	$ 7,900,000	$ 900,000
Average balance reserve requirement	38,700,000	0
Maximum amount of loans available for transfer	83,100,000
Loans outstanding made to affiliates	$ 0	$ 0

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities Available-for-Sale
Available for sale, amortized cost, total	$ 940,765	$ 882,872
Available for sale, gross unrealized gains	8,764	1,306
Available for sale, gross unrealized losses	(2,674)	(18,347)
Available for sale, fair value	946,855	865,831
Debt Securities Held-to-Maturity
Held to maturity, amortized cost	261,369	357,949
Held to maturity, gross unrealized gains	2,717	277
Held to maturity, gross unreazlied losses	(1,873)	(8,331)
Held to maturity, fair value	262,213	349,895
U.S. Treasury securities and obligations of U.S. government agencies
Debt Securities Available-for-Sale
Available for sale, amortized cost, total	9,914	7,200
Available for sale, gross unrealized gains	204	106
Available for sale, gross unrealized losses	(4)	(6)
Available for sale, fair value	10,114	7,300
Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities
Debt Securities Available-for-Sale
Available for sale, amortized cost, total	604,934	567,753
Available for sale, gross unrealized gains	5,784	300
Available for sale, gross unrealized losses	(1,511)	(14,047)
Available for sale, fair value	609,207	554,006
Debt Securities Held-to-Maturity
Held to maturity, amortized cost	261,369	304,423
Held to maturity, gross unrealized gains	2,717	0
Held to maturity, gross unreazlied losses	(1,873)	(7,324)
Held to maturity, fair value	262,213	297,099
Private mortgage-backed securities and collateralized mortgage obligations
Debt Securities Available-for-Sale
Available for sale, amortized cost, total	56,005	55,569
Available for sale, gross unrealized gains	1,561	560
Available for sale, gross unrealized losses	(5)	(401)
Available for sale, fair value	57,561	55,728
Debt Securities Held-to-Maturity
Held to maturity, amortized cost		21,526
Held to maturity, gross unrealized gains		277
Held to maturity, gross unreazlied losses		(130)
Held to maturity, fair value	0	21,673
Collateralized loan obligations
Debt Securities Available-for-Sale
Available for sale, amortized cost, total	239,364	212,807
Available for sale, gross unrealized gains	7	1
Available for sale, gross unrealized losses	(1,153)	(3,442)
Available for sale, fair value	238,218	209,366
Debt Securities Held-to-Maturity
Held to maturity, amortized cost		32,000
Held to maturity, gross unrealized gains		0
Held to maturity, gross unreazlied losses		(877)
Held to maturity, fair value	0	31,123
Obligations of state and political subdivisions
Debt Securities Available-for-Sale
Available for sale, amortized cost, total	30,548	39,543
Available for sale, gross unrealized gains	1,208	339
Available for sale, gross unrealized losses	(1)	(451)
Available for sale, fair value	$ 31,755	$ 39,431

Securities - Additional Informa

Securities - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale of debt securities available-for-sale	$ 202,724	$ 64,366	$ 235,613
Gross gains from sale of securities	2,900	200	1,600
Gross losses from sale of securities	1,800	700	$ 1,500
Unrealized losses	(4,547)	(26,678)
Fair value of mortgage backed securities of government sponsored entities	527,939	$ 1,124,777
Other assets of Federal Home Loan Bank and Federal Reserve Bank	44,300
Other assets	$ 6,400
Shares held (in shares)	51,513,733	51,361,079
Common Class B | Visa
Debt Securities, Available-for-sale [Line Items]
Shares held (in shares)	11,330
Common Class A | Visa
Debt Securities, Available-for-sale [Line Items]
Conversion rate of Class A stock for each share of Class B stock (in shares)	$ 1.6228
Shares of class A Visa stock issued (in shares)	18,386
CRA - Qualified Debt Securities
Debt Securities, Available-for-sale [Line Items]
Gross gains from sale of securities	$ 200
Gross losses from sale of securities		$ 100
Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses	(3,384)	(21,371)
Fair value of mortgage backed securities of government sponsored entities	324,241	823,604
Private mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Unrealized losses	(5)	(531)
Fair value of mortgage backed securities of government sponsored entities	2,978	32,810
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Unrealized losses	(1,153)	(4,319)
Fair value of mortgage backed securities of government sponsored entities	199,447	$ 238,894
Carrying Value | United States Treasury Deposits and Other Public and Trust Deposits
Debt Securities, Available-for-sale [Line Items]
Fair value of securities pledged as collateral	133,400
Carrying Value | Repurchase Agreement
Debt Securities, Available-for-sale [Line Items]
Fair value of securities pledged as collateral	$ 94,400

Securities - Amortized Cost a_2

Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Held to maturity, amortized cost, total	$ 261,369	$ 357,949
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held to maturity, fair value, total	262,213	349,895
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	940,765	882,872
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	946,855	865,831
Other debt obligations
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Held to maturity, amortized cost, due in less than one year	0
Held to maturity, amortized cost, due after one year through five years	0
Held to maturity, amortized cost, due after five years through ten years	0
Held to maturity, amortized cost, due after ten years	0
Held to maturity, amortized cost, total	0
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held to maturity, fair value, due in less than one year	0
Held to maturity, fair value, due after one year through five years	0
Held to maturity, fair value, due after five years through ten years	0
Held to maturity, fair value, due after ten years	0
Held to maturity, fair value, total	0
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, due in less than one year	3,472
Available for sale, amortized cost, due after one year through five years	8,582
Available for sale, amortized cost, due after five years through ten years	10,488
Available for sale, amortized cost, due after ten years	17,920
Available for sale, amortized cost, total	40,462
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, due in less than one year	3,523
Available for sale, fair value, due after one year through five years	8,698
Available for sale, fair value, due after five years through ten years	10,979
Available for sale, fair value, due after ten years	18,669
Available for sale, fair value, total	41,869
Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Held to maturity, amortized cost, total	261,369
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held to maturity, fair value, total	262,213	297,099
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	604,934	567,753
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	609,207	554,006
Private mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Held to maturity, amortized cost, total	0
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held to maturity, fair value, total	0	21,673
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	56,005	55,569
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	57,561	55,728
Collateralized loan obligations
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Held to maturity, amortized cost, total	0
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held to maturity, fair value, total	0	31,123
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	239,364	212,807
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	$ 238,218	$ 209,366

Securities - Schedule of Unreal

Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value
Less than 12 months	$ 312,988	$ 478,423
12 months or longer	214,951	646,354
Total	527,939	1,124,777
Unrealized Losses
Less than 12 months	(2,041)	(7,140)
12 months or longer	(2,506)	(19,538)
Total	(4,547)	(26,678)
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less than 12 months	758	99
12 months or longer	0	642
Total	758	741
Unrealized Losses
Less than 12 months	(4)	(1)
12 months or longer	0	(5)
Total	(4)	(6)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities
Fair Value
Less than 12 months	220,057	200,184
12 months or longer	104,184	623,420
Total	324,241	823,604
Unrealized Losses
Less than 12 months	(1,461)	(2,235)
12 months or longer	(1,923)	(19,136)
Total	(3,384)	(21,371)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less than 12 months	2,978	20,071
12 months or longer	0	12,739
Total	2,978	32,810
Unrealized Losses
Less than 12 months	(5)	(344)
12 months or longer	0	(187)
Total	(5)	(531)
Collateralized loan obligations
Fair Value
Less than 12 months	88,680	238,894
12 months or longer	110,767	0
Total	199,447	238,894
Unrealized Losses
Less than 12 months	(570)	(4,319)
12 months or longer	(583)	0
Total	(1,153)	(4,319)
Obligations of state and political subdivisions
Fair Value
Less than 12 months	515	19,175
12 months or longer	0	9,553
Total	515	28,728
Unrealized Losses
Less than 12 months	(1)	(241)
12 months or longer	0	(210)
Total	$ (1)	$ (451)

Loans - Schedule of Portfolio L

Loans - Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 5,198,404	$ 4,825,214
Deferred costs	19,900	16,900
Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	325,113	443,568
Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,378,971	2,132,066
Real Estate | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,507,863	1,324,377
Commercial and financial | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	778,252	722,322
Consumer | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	208,205	202,881
Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	4,317,918	3,588,251
Portfolio Loans | Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	281,335	301,473
Portfolio Loans | Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,834,811	1,437,989
Portfolio Loans | Real Estate | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,304,305	1,055,525
Portfolio Loans | Commercial and financial | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	697,301	603,057
Portfolio Loans | Consumer | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	200,166	190,207
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	12,666	14,434
PCI Loans | Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	160	151
PCI Loans | Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	10,217	10,828
PCI Loans | Real Estate | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,710	2,718
PCI Loans | Commercial and financial | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	579	737
PCI Loans | Consumer | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	0	0
PULs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	867,820	1,222,529
PULs | Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	43,618	141,944
PULs | Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	533,943	683,249
PULs | Real Estate | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	201,848	266,134
PULs | Commercial and financial | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	80,372	118,528
PULs | Consumer | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 8,039	$ 12,674

Loans - Past Due Financing Rece

Loans - Past Due Financing Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Current	$ 5,163,098	$ 4,775,965
Nonaccrual	26,955	26,476
Total financing receivables	5,198,404	4,825,214
Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	7,259	19,607
Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	984	2,640
Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	108	526
Real Estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total financing receivables	325,113	443,568
Real Estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total financing receivables	2,378,971	2,132,066
Real Estate | Residential real estate
Financing Receivable, Past Due [Line Items]
Total financing receivables	1,507,863	1,324,377
Commercial and financial | Commercial and financial
Financing Receivable, Past Due [Line Items]
Total financing receivables	778,252	722,322
Consumer | Consumer
Financing Receivable, Past Due [Line Items]
Total financing receivables	208,205	202,881
Portfolio Loans
Financing Receivable, Past Due [Line Items]
Current	4,290,227	3,557,127
Nonaccrual	20,990	15,783
Total financing receivables	4,317,918	3,588,251
Portfolio Loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	6,040	12,296
Portfolio Loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	553	2,609
Portfolio Loans | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	108	436
Portfolio Loans | Real Estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Current	276,984	301,348
Nonaccrual	4,351	28
Total financing receivables	281,335	301,473
Portfolio Loans | Real Estate | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	97
Portfolio Loans | Real Estate | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
Portfolio Loans | Real Estate | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
Portfolio Loans | Real Estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Current	1,828,629	1,427,413
Nonaccrual	4,356	6,486
Total financing receivables	1,834,811	1,437,989
Portfolio Loans | Real Estate | Commercial real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	1,606	3,852
Portfolio Loans | Real Estate | Commercial real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	220	97
Portfolio Loans | Real Estate | Commercial real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	141
Portfolio Loans | Real Estate | Residential real estate
Financing Receivable, Past Due [Line Items]
Current	1,294,778	1,044,375
Nonaccrual	7,945	7,806
Total financing receivables	1,304,305	1,055,525
Portfolio Loans | Real Estate | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	1,564	2,524
Portfolio Loans | Real Estate | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	18	525
Portfolio Loans | Real Estate | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	295
Portfolio Loans | Commercial and financial | Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	690,412	594,930
Nonaccrual	4,228	1,280
Total financing receivables	697,301	603,057
Portfolio Loans | Commercial and financial | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	2,553	5,186
Portfolio Loans | Commercial and financial | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	1,661
Portfolio Loans | Commercial and financial | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	108	0
Portfolio Loans | Consumer | Consumer
Financing Receivable, Past Due [Line Items]
Current	199,424	189,061
Nonaccrual	110	183
Total financing receivables	200,166	190,207
Portfolio Loans | Consumer | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	317	637
Portfolio Loans | Consumer | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	315	326
Portfolio Loans | Consumer | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PULs
Financing Receivable, Past Due [Line Items]
Current	862,272	1,209,670
Nonaccrual	3,898	7,096
Total financing receivables	867,820	1,222,529
PULs | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	1,219	5,642
PULs | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	431	31
PULs | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	90
PULs | Real Estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Current	43,044	140,013
Nonaccrual	574	0
Total financing receivables	43,618	141,944
PULs | Real Estate | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	1,931
PULs | Real Estate | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PULs | Real Estate | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PULs | Real Estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Current	531,325	680,060
Nonaccrual	1,245	1,343
Total financing receivables	533,943	683,249
PULs | Real Estate | Commercial real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	942	1,846
PULs | Real Estate | Commercial real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	431	0
PULs | Real Estate | Commercial real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PULs | Real Estate | Residential real estate
Financing Receivable, Past Due [Line Items]
Current	201,159	260,781
Nonaccrual	412	3,740
Total financing receivables	201,848	266,134
PULs | Real Estate | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	277	1,523
PULs | Real Estate | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PULs | Real Estate | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	90
PULs | Commercial and financial | Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	78,705	116,173
Nonaccrual	1,667	2,013
Total financing receivables	80,372	118,528
PULs | Commercial and financial | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	342
PULs | Commercial and financial | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PULs | Commercial and financial | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PULs | Consumer | Consumer
Financing Receivable, Past Due [Line Items]
Current	8,039	12,643
Nonaccrual	0	0
Total financing receivables	8,039	12,674
PULs | Consumer | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PULs | Consumer | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	31
PULs | Consumer | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans
Financing Receivable, Past Due [Line Items]
Current	10,599	9,168
Nonaccrual	2,067	3,597
Total financing receivables	12,666	14,434
PCI Loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	1,669
PCI Loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Real Estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Current	148	135
Nonaccrual	12	16
Total financing receivables	160	151
PCI Loans | Real Estate | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Real Estate | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Real Estate | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Real Estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Current	9,298	8,403
Nonaccrual	919	1,391
Total financing receivables	10,217	10,828
PCI Loans | Real Estate | Commercial real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	1,034
PCI Loans | Real Estate | Commercial real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Real Estate | Commercial real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Real Estate | Residential real estate
Financing Receivable, Past Due [Line Items]
Current	587	556
Nonaccrual	1,123	2,162
Total financing receivables	1,710	2,718
PCI Loans | Real Estate | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Real Estate | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Real Estate | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Commercial and financial | Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	566	74
Nonaccrual	13	28
Total financing receivables	579	737
PCI Loans | Commercial and financial | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	635
PCI Loans | Commercial and financial | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Commercial and financial | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Consumer | Consumer
Financing Receivable, Past Due [Line Items]
Current	0	0
Nonaccrual	0	0
Total financing receivables	0	0
PCI Loans | Consumer | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Consumer | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivables past due	0	0
PCI Loans | Consumer | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivables past due	$ 0	$ 0

Loans - Additional Information

Loans - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019USD ($)paymentcontract	Dec. 31, 2018USD ($)paymentcontract	Dec. 31, 2017USD ($)paymentcontract
Receivables [Abstract]
Reduction in interest income	$ 400,000	$ 1,000,000	$ 700,000
Loans to directors and executive officers	1,700,000	$ 900,000
New loans offered	$ 0
Number of loans modified in troubled debt restructurings | contract	9	4	1
Value of loans modified in troubled debt restructurings	$ 4,700,000	$ 200,000	$ 100,000
Payments for loans in default, number of payments | payment	4	0	0
Payments for loans in default	$ 3,200,000
Accruals for trouble debt restructurings	11,100,000	$ 13,300,000
Average amount for loans impaired	35,600,000	35,300,000	$ 30,900,000
Interest income on impaired loans	2,000,000	2,000,000	1,500,000
Interest income related to impaired loans with impairment measured on present value of expected future cash flows	$ 100,000	$ 200,000	$ 300,000

Loans - Risk Category, Class of

Loans - Risk Category, Class of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	$ 5,198,404	$ 4,825,214
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	5,091,691	4,694,297
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	51,560	67,296
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	53,958	63,596
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	1,195	25
Real Estate | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	325,113	443,568
Real Estate | Construction and land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	317,765	428,044
Real Estate | Construction and land development | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	2,235	10,429
Real Estate | Construction and land development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	5,113	5,095
Real Estate | Construction and land development | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	0	0
Real Estate | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	2,378,971	2,132,066
Real Estate | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	2,331,725	2,063,589
Real Estate | Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	26,827	41,429
Real Estate | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	20,098	27,048
Real Estate | Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	321	0
Real Estate | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	1,507,863	1,324,377
Real Estate | Residential real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	1,482,278	1,296,634
Real Estate | Residential real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	7,364	3,654
Real Estate | Residential real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	18,221	24,089
Real Estate | Residential real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	0	0
Commercial and financial | Commercial and financial
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	778,252	722,322
Commercial and financial | Commercial and financial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	755,957	707,663
Commercial and financial | Commercial and financial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	11,925	8,387
Commercial and financial | Commercial and financial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	9,496	6,247
Commercial and financial | Commercial and financial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	874	25
Consumer | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	208,205	202,881
Consumer | Consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	203,966	198,367
Consumer | Consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	3,209	3,397
Consumer | Consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	1,030	1,117
Consumer | Consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	$ 0	$ 0

Loans - Changes in Accretable Y

Loans - Changes in Accretable Yield on PCI Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$ 2,924	$ 3,699	$ 3,807
Additions	0	0	763
Deletions	0	(43)	(11)
Accretion	(1,778)	(1,291)	(1,647)
Reclassifications from non-accretable difference	703	559	787
Ending Balance	$ 1,849	$ 2,924	$ 3,699

Loans - Impaired Financing Rece

Loans - Impaired Financing Receivables, Excluding PCI Loans and Valuation Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Recorded Investment
Total Impaired Loans	$ 36,096	$ 36,700
Unpaid Principal Balance
Total Impaired Loans	44,100	46,545
Related Valuation Allowance	2,858	2,728
Real Estate | Construction and land development
Recorded Investment
Impaired Loans with No Related Allowance Recorded	4,995	15
Impaired Loans with an Allowance Recorded	62	196
Total Impaired Loans	5,057	211
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	5,186	229
Impaired Loans with an Allowance Recorded	78	211
Total Impaired Loans	5,264	440
Related Valuation Allowance	14	22
Real Estate | Commercial real estate
Recorded Investment
Impaired Loans with No Related Allowance Recorded	6,070	3,852
Impaired Loans with an Allowance Recorded	4,196	9,786
Total Impaired Loans	10,266	13,638
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	7,590	5,138
Impaired Loans with an Allowance Recorded	4,196	12,967
Total Impaired Loans	11,786	18,105
Related Valuation Allowance	220	369
Real Estate | Residential real estate
Recorded Investment
Impaired Loans with No Related Allowance Recorded	9,470	13,510
Impaired Loans with an Allowance Recorded	4,914	5,537
Total Impaired Loans	14,384	19,047
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	14,182	18,111
Impaired Loans with an Allowance Recorded	4,914	5,664
Total Impaired Loans	19,096	23,775
Related Valuation Allowance	834	805
Commercial and financial | Commercial and financial
Recorded Investment
Impaired Loans with No Related Allowance Recorded	3,485	1,191
Impaired Loans with an Allowance Recorded	2,567	2,131
Total Impaired Loans	6,052	3,322
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	4,475	1,414
Impaired Loans with an Allowance Recorded	3,115	2,309
Total Impaired Loans	7,590	3,723
Related Valuation Allowance	1,731	1,498
Consumer | Consumer
Recorded Investment
Impaired Loans with No Related Allowance Recorded	111	280
Impaired Loans with an Allowance Recorded	226	202
Total Impaired Loans	337	482
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	125	291
Impaired Loans with an Allowance Recorded	239	211
Total Impaired Loans	364	502
Related Valuation Allowance	$ 59	$ 34

Allowance for Loan Losses - Act

Allowance for Loan Losses - Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Loan Losses:
Beginning Balance	$ 32,423	$ 27,122	$ 23,400
Provision for loan losses	10,999	11,730	5,648
Charge- Offs	(10,559)	(8,026)	(4,102)
Recoveries	2,420	1,789	2,495
TDR Allowance Adjustments	(129)	(192)	(319)
Ending Balance	35,154	32,423	27,122
Real Estate | Construction and land development
Allowance for Loan Losses:
Beginning Balance	2,233	1,642	1,219
Provision for loan losses	(421)	564	(471)
Charge- Offs	0	0	0
Recoveries	31	27	896
TDR Allowance Adjustments	(1)	0	(2)
Ending Balance	1,842	2,233	1,642
Real Estate | Commercial real estate
Allowance for Loan Losses:
Beginning Balance	11,112	9,285	9,273
Provision for loan losses	1,677	4,736	(264)
Charge- Offs	(248)	(3,139)	(407)
Recoveries	744	292	747
TDR Allowance Adjustments	(61)	(62)	(64)
Ending Balance	13,224	11,112	9,285
Real Estate | Residential real estate
Allowance for Loan Losses:
Beginning Balance	7,775	7,131	7,483
Provision for loan losses	(231)	29	125
Charge- Offs	(152)	(80)	(569)
Recoveries	338	816	336
TDR Allowance Adjustments	(63)	(121)	(244)
Ending Balance	7,667	7,775	7,131
Commercial and financial | Commercial and financial
Allowance for Loan Losses:
Beginning Balance	8,585	7,297	3,636
Provision for loan losses	7,969	4,359	5,304
Charge- Offs	(7,550)	(3,396)	(1,869)
Recoveries	712	325	226
TDR Allowance Adjustments	0	0	0
Ending Balance	9,716	8,585	7,297
Consumer | Consumer
Allowance for Loan Losses:
Beginning Balance	2,718	1,767	1,789
Provision for loan losses	2,005	2,042	954
Charge- Offs	(2,609)	(1,411)	(1,257)
Recoveries	595	329	290
TDR Allowance Adjustments	(4)	(9)	(9)
Ending Balance	$ 2,705	$ 2,718	$ 1,767

Allowance for Loan Losses - Loa

Allowance for Loan Losses - Loan Portfolio and Related Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Recorded Investment
Individually Evaluated for Impairment	$ 36,096	$ 36,700
Collectively Evaluated for Impairment	32,296	29,695
Total	5,185,738	4,810,780
Associated Allowance
Individually Evaluated for Impairment	2,858	2,728
Collectively Evaluated for Impairment	5,149,642	4,774,080
Total	35,154	32,423
Real Estate | Construction and land development
Recorded Investment
Individually Evaluated for Impairment	5,057	211
Collectively Evaluated for Impairment	1,828	2,211
Total	324,953	443,417
Associated Allowance
Individually Evaluated for Impairment	14	22
Collectively Evaluated for Impairment	319,896	443,206
Total	1,842	2,233
Real Estate | Commercial real estate
Recorded Investment
Individually Evaluated for Impairment	10,267	13,638
Collectively Evaluated for Impairment	13,004	10,743
Total	2,368,754	2,121,238
Associated Allowance
Individually Evaluated for Impairment	220	369
Collectively Evaluated for Impairment	2,358,487	2,107,600
Total	13,224	11,112
Real Estate | Residential real estate
Recorded Investment
Individually Evaluated for Impairment	14,383	19,047
Collectively Evaluated for Impairment	6,833	6,970
Total	1,506,153	1,321,659
Associated Allowance
Individually Evaluated for Impairment	834	805
Collectively Evaluated for Impairment	1,491,770	1,302,612
Total	7,667	7,775
Commercial and financial | Commercial and financial
Recorded Investment
Individually Evaluated for Impairment	6,052	3,322
Collectively Evaluated for Impairment	7,985	7,087
Total	777,673	721,585
Associated Allowance
Individually Evaluated for Impairment	1,731	1,498
Collectively Evaluated for Impairment	771,621	718,263
Total	9,716	8,585
Consumer | Consumer
Recorded Investment
Individually Evaluated for Impairment	337	482
Collectively Evaluated for Impairment	2,646	2,684
Total	208,205	202,881
Associated Allowance
Individually Evaluated for Impairment	59	34
Collectively Evaluated for Impairment	207,868	202,399
Total	2,705	2,718
PCI Loans
Recorded Investment
Individually Evaluated for Impairment	12,666	14,434
Associated Allowance
Individually Evaluated for Impairment	0	0
PCI Loans | Real Estate | Construction and land development
Recorded Investment
Individually Evaluated for Impairment	160	151
Associated Allowance
Individually Evaluated for Impairment	0	0
PCI Loans | Real Estate | Commercial real estate
Recorded Investment
Individually Evaluated for Impairment	10,217	10,828
Associated Allowance
Individually Evaluated for Impairment	0	0
PCI Loans | Real Estate | Residential real estate
Recorded Investment
Individually Evaluated for Impairment	1,710	2,718
Associated Allowance
Individually Evaluated for Impairment	0	0
PCI Loans | Commercial and financial | Commercial and financial
Recorded Investment
Individually Evaluated for Impairment	579	737
Associated Allowance
Individually Evaluated for Impairment	0	0
PCI Loans | Consumer | Consumer
Recorded Investment
Individually Evaluated for Impairment	0	0
Associated Allowance
Individually Evaluated for Impairment	$ 0	$ 0

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recapture of loan losses	$ 10,999	$ 11,730	$ 5,648
Recoveries	2,420	1,789	$ 2,495
PULs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recapture of loan losses	700	200
Recoveries	700	100
Loans | The Bank Shares Inc
Financing Receivable, Troubled Debt Restructuring [Line Items]
Remaining fair value adjustment for loans acquired	$ 33,300	$ 47,000
Percentage of fair value adjustment for loans acquired	3.84%	3.86%

Bank Premises and Equipment - S

Bank Premises and Equipment - Summary of Bank Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Cost	$ 120,384	$ 121,919
Accumulated Depreciation & Amortization	(53,769)	(50,895)
Net Carrying Value	66,615	71,024
Land	18,546	18,269
Premises
Property, Plant and Equipment [Line Items]
Cost	83,020	85,027
Accumulated Depreciation & Amortization	(26,180)	(26,107)
Net Carrying Value	56,840	58,920
Furniture and Equipment
Property, Plant and Equipment [Line Items]
Cost	37,364	36,892
Accumulated Depreciation & Amortization	(27,589)	(24,788)
Net Carrying Value	$ 9,775	$ 12,104

Goodwill and Acquired Intangi_3

Goodwill and Acquired Intangible Assets - Changes In Carrying Amount Of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning of year	$ 204,753	$ 147,578	$ 64,649
Changes from business combinations	533	57,175	82,929
Total	$ 205,286	$ 204,753	$ 147,578

Goodwill and Acquired Intangi_4

Goodwill and Acquired Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Intangible Asset (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward]
Beginning of year	$ 24,807	$ 18,937	$ 14,572
Acquired CDI, including measurement period adjustments	(676)	10,170	7,726
Amortization expense	(5,826)	(4,300)	(3,361)
End of year	$ 18,305	$ 24,807	$ 18,937
Remaining average amortization period for CDI	47 months	58 months	63 months

Goodwill and Acquired Intangi_5

Goodwill and Acquired Intangible Assets - Acquired Intangible Assets Consist of Core Deposit Intangibles (Details) - Deposit Base - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 36,015	$ 36,691
Accumulated Amortization	$ (17,710)	$ (11,884)

Goodwill and Acquired Intangi_6

Goodwill and Acquired Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
2020 amortization expense	$ 5.7
2021 amortization expense	4.5
2022 amortization expense	4
2023 amortization expense	3.3
2024 amortization expense	0.6
Mortgage service rights retained from sale of SBA	$ 1.8	$ 1.1

Borrowings - Federal Funds Purc

Borrowings - Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Maximum amount outstanding at any month end	$ 193,388	$ 341,213	$ 216,094
Weighted average interest rate at end of year	1.17%	1.14%	0.71%
Average amount outstanding	$ 106,142	$ 200,839	$ 171,686
Weighted average interest rate during the year	1.35%	0.90%	0.46%

Borrowings - Schedule of Collat

Borrowings - Schedule of Collateral Type and Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities
Short-term Debt [Line Items]
Fair value of pledged securities - overnight and continuous:	$ 94,354	$ 246,829	$ 248,654

Borrowings - Additional Informa

Borrowings - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Secured lines of credit	$ 2,100
Secured Lines of Credit
Debt Instrument [Line Items]
Advances from Federal Home Loan Banks	$ 315
Weighted average interest rate on Federal Home Loan Bank advances during the year	2.28%
Weighted average interest rate on Federal Home Loan Bank advances at end of year	1.72%
Trust I & II
Debt Instrument [Line Items]
Junior subordinated deferrable interest notes issued	$ 41.2
SBCF Statutory Trust III
Debt Instrument [Line Items]
Junior subordinated deferrable interest notes issued	$ 12.4

Borrowings - Schedule of Junior

Borrowings - Schedule of Junior Subordinated Debentures and Related Trust Preferred and Common Equity Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Junior subordinated debt	$ 75,261
Trust preferred securities	73,000
Common equity securities	2,261
Unamortized debt discount	5,600
SBCF Capital Trust I
Debt Instrument [Line Items]
Junior subordinated debt	20,619
Trust preferred securities	20,000
Common equity securities	$ 619
Interest rate on junior subordinated loans	3.69%
SBCF Capital Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	17.50%
SBCF Statutory Trust II
Debt Instrument [Line Items]
Junior subordinated debt	$ 20,619
Trust preferred securities	20,000
Common equity securities	$ 619
Interest rate on junior subordinated loans	3.22%
SBCF Statutory Trust II | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	13.30%
SBCF Statutory Trust III
Debt Instrument [Line Items]
Junior subordinated debt	$ 12,372
Trust preferred securities	12,000
Common equity securities	$ 372
Interest rate on junior subordinated loans	3.24%
SBCF Statutory Trust III | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	13.50%
BANKshares, Inc. Statutory Trust I
Debt Instrument [Line Items]
Junior subordinated debt	$ 5,155
Trust preferred securities	5,000
Common equity securities	$ 155
Interest rate on junior subordinated loans	5.20%
BANKshares, Inc. Statutory Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	32.50%
BANKshares, Inc. Statutory Trust II
Debt Instrument [Line Items]
Junior subordinated debt	$ 4,124
Trust preferred securities	4,000
Common equity securities	$ 124
Interest rate on junior subordinated loans	4.69%
BANKshares, Inc. Statutory Trust II | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	27.90%
BANKshares, Inc. Capital Trust I
Debt Instrument [Line Items]
Junior subordinated debt	$ 5,155
Trust preferred securities	5,000
Common equity securities	$ 155
Interest rate on junior subordinated loans	3.30%
BANKshares, Inc. Capital Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	13.90%
Grand Bank Capital Trust I
Debt Instrument [Line Items]
Junior subordinated debt	$ 7,217
Trust preferred securities	7,000
Common equity securities	$ 217
Interest rate on junior subordinated loans	3.94%
Grand Bank Capital Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	19.80%

Employee Benefits and Stock C_3

Employee Benefits and Stock Compensation - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 23, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined contribution plan charges to operations	$ 2.4	$ 2.1	$ 1.9
Number of shares authorized for issuance (in shares)					4,250,000
Number of shares authorized for repurchase (in shares)	300,000
Percent of fair market value that employees may purchase shares	95.00%
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares authorized for issuance (in shares)	1,057,000
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Maximum term	10 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target award percentage	0.00%	0.00%	0.00%	0.00%
Restricted Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target award percentage	225.00%	200.00%	200.00%	200.00%

Employee Benefits and Stock C_4

Employee Benefits and Stock Compensation - Impact of Shared-Based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement [Abstract]
Share-based compensation expense	$ 7,244	$ 7,823	$ 5,267
Income tax benefit	$ (1,723)	$ (1,911)	$ (1,966)

Employee Benefits and Stock C_5

Employee Benefits and Stock Compensation - Summary of Unrecognized Compensation Cost (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 8,195
Weighted-Average Period Remaining (Years)	1 year 7 months 6 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 3,577
Weighted-Average Period Remaining (Years)	1 year 7 months 6 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 3,921
Weighted-Average Period Remaining (Years)	1 year 8 months 12 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 697
Weighted-Average Period Remaining (Years)	10 months 24 days

Employee Benefits and Stock C_6

Employee Benefits and Stock Compensation - Summary of Status of Restricted Stock and Restricted Stock Units (Details)	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Restricted Stock
Restricted Award Shares
Non-vested beginning balance (in shares) | shares	295,130
Granted (in shares) | shares	157,861
Forfeited/Cancelled (in shares) | shares	(63,666)
Vested (in shares) | shares	(175,374)
Non-vested ending balance (in shares) | shares	213,951
Weighted-Average Grant-Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 24.09
Granted (in dollars per share) | $ / shares	26.86
Forfeited/Cancelled (in dollars per share) | $ / shares	25.83
Vested (in dollars per share) | $ / shares	23.54
Non-vested at ending of period (in dollars per share) | $ / shares	$ 26.07
Restricted Stock Units
Restricted Award Shares
Non-vested beginning balance (in shares) | shares	503,111
Granted (in shares) | shares	75,002
Forfeited/Cancelled (in shares) | shares	(8,242)
Vested (in shares) | shares	(187,941)
Non-vested ending balance (in shares) | shares	381,930
Weighted-Average Grant-Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 19.69
Granted (in dollars per share) | $ / shares	30.02
Forfeited/Cancelled (in dollars per share) | $ / shares	20.29
Vested (in dollars per share) | $ / shares	15.24
Non-vested at ending of period (in dollars per share) | $ / shares	$ 23.89

Employee Benefits and Stock C_7

Employee Benefits and Stock Compensation - Summary of Restricted Stock and Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	157,861	242,613	114,331
Weighted-average grant date fair value (in dollars per share)	$ 26.86	$ 26.48	$ 24.08
Fair value of awards vested	$ 4,128	$ 2,515	$ 1,407
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	75,002	173,193	164,268
Weighted-average grant date fair value (in dollars per share)	$ 30.02	$ 24.02	$ 23.94
Fair value of awards vested	$ 2,864	$ 1,095	$ 937

Employee Benefits and Stock C_8

Employee Benefits and Stock Compensation - Summary of the Fair Value of Each Option Grant on the Date of Grant (Details) - Stock Option	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rates	2.53%	2.56%	1.85%
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility	34.50%	26.60%	25.40%
Expected lives (years)	5 years	5 years	5 years

Employee Benefits and Stock C_9

Employee Benefits and Stock Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - Stock options $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)$ / sharesshares
Options
Options, outstanding at beginning of period (in shares) | shares	933,495
Options granted (in shares) | shares	3,438
Options, exercised (in shares) | shares	(28,824)
Options, forfeited (in shares) | shares	(4,330)
Options, outstanding at end of period (in shares) | shares	903,779
Options, exercisable at end of period (in shares) | shares	633,561
Weighted-Average Exercise Price
Weighted-average exercise price at beginning of period (in dollars per share) | $ / shares	$ 22
Weighted-average exercise price, granted (in dollars per share) | $ / shares	28.42
Weighted-average exercise price, exercised (in dollars per share) | $ / shares	14.86
Weighted-average exercise price, forfeited (in dollars per share) | $ / shares	29.17
Weighted-average exercise price at end of period (in dollars per share) | $ / shares	22.22
Weighted-average exercise price, exercisable at end of period (in dollars per share) | $ / shares	$ 19.82
Weighted- Average Remaining Contractual Term and Aggregate Intrinsic Value
Weighted-average remaining contractual term, outstanding	6 years 1 month 20 days
Weighted-average remaining contractual term, exercisable	5 years 7 months 24 days
Aggregate intrinsic value, outstanding | $	$ 7,669
Aggregate intrinsic value, exercisable | $	$ 6,848

Employee Benefits and Stock _10

Employee Benefits and Stock Compensation - Summary of Stock Options (Details) - Stock Option - USD ($) $ / shares in Units, $ 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]
Options granted (in shares)	3,438	219,118	297,576
Weighted-average grant date fair value (in dollars per share)	$ 28.42	$ 5.65	$ 4.66
Intrinsic value of stock options exercised	$ 277	$ 3,045	$ 1,143

Employee Benefits and Stock _11

Employee Benefits and Stock Compensation - Summary of Information Related to Stock Options (Details)	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	903,779
Remaining Contractual Life (Years)	6 years 1 month 6 days
Options exercisable (in shares) | shares	633,561
Weighted average exercise price (in dollars per share)	$ 19.82
$10.54 to $14.82
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	368,611
Remaining Contractual Life (Years)	4 years 2 months 12 days
Options exercisable (in shares) | shares	334,016
Weighted average exercise price (in dollars per share)	$ 12.42
Range of exercise prices, lower limit (in dollars per share)	10.54
Range of exercise prices,upper limit (in dollars per share)	$ 14.82
$15.99 to $28.69
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	326,909
Remaining Contractual Life (Years)	7 years 1 month 6 days
Options exercisable (in shares) | shares	229,824
Weighted average exercise price (in dollars per share)	$ 27.16
Range of exercise prices, lower limit (in dollars per share)	15.99
Range of exercise prices,upper limit (in dollars per share)	$ 28.69
$31.15 to $31.15
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	208,259
Remaining Contractual Life (Years)	8 years 2 months 12 days
Options exercisable (in shares) | shares	69,721
Weighted average exercise price (in dollars per share)	$ 31.15
Range of exercise prices, lower limit (in dollars per share)	31.15
Range of exercise prices,upper limit (in dollars per share)	$ 31.15

Employee Benefits and Stock _12

Employee Benefits and Stock Compensation - Employee Stock Purchase Plan (Details) - ESPP - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	16,320	15,225	12,434
Weighted-average employee purchase price (in dollars per share)	$ 25.39	$ 26.85	$ 22.67

Lease Commitments - Lease Cost

Lease Commitments - Lease Cost Information Related to Operating Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 5,570
Variable lease cost	1,211
Short-term lease cost	715
Sublease income	(618)
Total lease cost	$ 6,878

Lease Commitments - Supplementa

Lease Commitments - Supplemental Balance Sheet and Cash Flow Information Related to Operating Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating lease right-of-use assets	$ 26,165
Operating lease liabilities	30,098
Cash paid for amounts included in the measurement of operating lease liabilities	5,936
Right-of-use assets obtained in exchange for new operating lease obligations	$ 1,224
Weighted average remaining lease term for operating leases	8 years 6 months
Weighted average discount rate for operating leases	4.70%

Lease Commitments - Maturities

Lease Commitments - Maturities of Lease Liabilities (Details) $ in Thousands	Dec. 31, 2019USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2020	$ 5,626
2021	4,965
2022	4,436
2023	3,725
2024	3,734
Thereafter	14,498
Total undiscounted cash flows	36,984
Less: Net present value adjustment	(6,886)
Total	$ 30,098

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax Expense Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
Federal	$ 20,954	$ 9,078	$ 667
State	1,932	0	2
Deferred
Federal	2,808	7,018	32,791
State	4,179	4,163	2,876
Total income tax provision	$ 29,873	$ 20,259	$ 36,336

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Expected Tax Benefit with Pretax Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax rate applied to income before income taxes	$ 27,008	$ 18,381	$ 27,720
Increase (decrease) resulting from the effects of:
Tax law change	0	0	8,552
Nondeductible acquisition costs	125	207	657
Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance	(1,282)	(667)	(1,445)
State income taxes	(1,283)	(874)	(1,007)
Tax credit investments	(72)	(33)	(165)
Stock compensation	(698)	(918)	(1,027)
Other	(36)	0	173
Federal tax provision	23,762	16,096	33,458
State tax provision	6,111	4,163	2,878
Total income tax provision	$ 29,873	$ 20,259	$ 36,336

Income Taxes - Summary of Net D

Income Taxes - Summary of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets, Gross [Abstract]
Allowance for loan losses	$ 8,949	$ 8,592
Premises and equipment	0	1,670
Other real estate owned	8	207
Accrued stock compensation	2,406	2,547
Federal tax loss carryforward	3,601	4,699
State tax loss carryforward	1,110	2,912
Alternative minimum tax credit carryforward	530	0
Lease liabilities	7,381	0
Net unrealized securities losses	0	4,658
Deferred compensation	2,458	2,287
Accrued interest and fee income	3,106	7,674
Other	378	1,627
Gross deferred tax assets	29,927	36,873
Less: Valuation allowance	0	0
Deferred tax assets net of valuation allowance	29,927	36,873
Deferred Tax Liabilities, Gross [Abstract]
Core deposit base intangible	(4,005)	(5,706)
Net unrealized securities gains	(1,210)	0
Premises and equipment	(114)	0
Right of use assets	(6,416)	0
Other	(1,725)	(2,213)
Gross deferred tax liabilities	(13,470)	(7,919)
Net deferred tax assets	$ 16,457	$ 28,954

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	Dec. 22, 2017	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Unrealized gains resulting in a deferred tax liability			$ 5,700,000
Deferred tax liability from unrealized gains on certain investments in debt securities			1,210,000	$ 0
Unrealized losses resulting in a deferred tax asset				17,700,000
Deferred tax assets from unrealized losses on certain investments in debt securities			0	4,658,000
Net deferred tax assets			16,457,000	28,954,000
Deferred income tax assets			16,457,000	28,954,000
Accrual for income tax interest or penalties			0
Income tax benefit related to share-based compensation			(29,873,000)	(20,259,000)	$ (36,336,000)
Amortization reflected as income expense related to affordable housing project investments			900,000	1,000,000	700,000
Affordable housing project tax credits			800,000	800,000	600,000
Affordable housing project tax benefits			200,000	200,000	300,000
Carrying value of affordable housing tax credits			7,400,000	8,300,000
Affordable housing tax credits, unfunded amounts			500,000	3,200,000
Unrecognized income tax benefits			0
One-time charge to income tax expense as a result of the tax cuts and jobs act of 2017	$ 8,600,000
Adjustment to true-up tax benefit related to tax cuts and jobs act of 2017			200,000
Tax rate applied to income before income taxes			27,008,000	18,381,000	27,720,000
U.S. Federal
Operating Loss Carryforwards [Line Items]
Net deferred tax assets			12,900,000
Deferred income tax assets			3,600,000
State
Operating Loss Carryforwards [Line Items]
Net deferred tax assets			3,500,000
Deferred income tax assets			1,100,000
Tax rate applied to income before income taxes		$ 1,100,000	(400,000)
Accounting Standards Update 2016-09
Operating Loss Carryforwards [Line Items]
Income tax benefit related to share-based compensation			$ 800,000	$ 1,100,000	$ 1,100,000

Noninterest Income and Expens_3

Noninterest Income and Expenses - Summary of Noninterest Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Noninterest Income
Brokerage commissions and fees	$ 1,909	$ 1,732	$ 1,352
Marine finance fees	1,054	1,398	910
Interchange income	13,399	12,335	10,583
BOLI income	3,674	4,291	3,426
SBA gains	2,472	2,474	579
Other	10,545	8,352	6,177
Noninterest Income	55,515	50,645	43,230
Gain on sale of Visa stock	0	0	15,153
Securities gains (losses), net	1,217	(623)	86
Total Noninterest Income	56,732	50,022	58,469
Noninterest Expenses
Salaries and wages	73,829	71,111	65,692
Employee benefits	13,697	12,945	11,732
Outsourced data processing costs	15,077	16,374	14,116
Telephone and data lines	2,958	2,481	2,291
Occupancy	14,284	13,394	13,290
Furniture and equipment	6,245	6,744	6,067
Marketing	4,161	5,085	4,784
Legal and professional fees	8,553	9,961	11,022
FDIC assessments	881	2,195	2,326
Amortization of intangibles	5,826	4,300	3,361
Foreclosed property expense and net loss (gain) on sale	51	461	(300)
Other	15,177	17,222	15,535
Total Noninterest Expenses	160,739	162,273	149,916
Service charges on deposit accounts
Noninterest Income
Revenues	11,529	11,198	10,049
Trust fees
Noninterest Income
Revenues	4,443	4,183	3,705
Mortgage banking fees
Noninterest Income
Revenues	$ 6,490	$ 4,682	$ 6,449

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Required Regulatory Capital (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Parent Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital Ratio (to risk-weighted assets), Amount	$ 860,934	$ 744,687
Tier 1 Capital (to risk-weighted assets), Amount	825,640	712,144
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	754,555	641,340
Leverage (to adjusted average assets), Amount	$ 825,640	$ 712,144
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	15.71%	14.43%
Tier 1 Capital (to risk-weighted assets), Ratio	15.06%	13.80%
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	13.77%	12.43%
Leverage (to adjusted average assets), Ratio	12.20%	11.16%
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 438,506	$ 412,754
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	328,880	309,566
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	246,660	232,174
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 270,788	$ 255,167
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	8.00%	8.00%
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	6.00%	6.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Ratio	4.50%	4.50%
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Ratio	4.00%	4.00%
Seacoast National Bank (A Wholly Owned Bank Subsidiary)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital Ratio (to risk-weighted assets), Amount	$ 804,058	$ 701,093
Tier 1 Capital (to risk-weighted assets), Amount	768,764	668,550
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	768,764	668,550
Leverage (to adjusted average assets), Amount	$ 768,764	$ 668,550
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	14.68%	13.60%
Tier 1 Capital (to risk-weighted assets), Ratio	14.04%	12.97%
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	14.04%	12.97%
Leverage (to adjusted average assets), Ratio	11.38%	10.49%
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 437,952	$ 412,486
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	328,464	309,364
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	246,348	232,023
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 270,230	$ 255,036
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	8.00%	8.00%
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	6.00%	6.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Ratio	4.50%	4.50%
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Ratio	4.00%	4.00%
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 547,440	$ 515,607
Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	437,952	412,486
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	355,836	335,145
Leverage (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 337,787	$ 318,795
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Leverage (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer rate	2.50%	1.875%
Shares issued from treasury stock (in shares)	0	0
Stock Purchase Plan
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Reserved common shares for issuance (in shares)	300,000
Profit Sharing Plan
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Reserved common shares for issuance (in shares)	1,000,000

Seacoast Banking Corporation _3

Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Summary of Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Other assets	$ 6,400
Total Assets	7,108,511	$ 6,747,659
Liabilities and Shareholders' Equity
Subordinated debt	71,085	70,804
Shareholders' equity	985,639	864,267	$ 689,664	$ 435,397
Total Liabilities & Shareholders' Equity	7,108,511	6,747,659
Parent Company
Assets
Cash	70	197
Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days	52,979	40,130
Investment in subsidiaries	1,005,756	897,683
Other assets	1,515	777
Total Assets	1,060,320	938,787
Liabilities and Shareholders' Equity
Subordinated debt	71,085	70,804
Other liabilities	3,700	3,716
Shareholders' equity	985,535	864,267
Total Liabilities & Shareholders' Equity	$ 1,060,320	$ 938,787

Seacoast Banking Corporation _4

Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Summary of Statements of Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income
Gain on sale of Visa stock	$ 0	$ 0	$ 15,153
Total Interest Income	289,823	241,398	191,596
Interest expense	46,205	29,883	15,300
Other expenses	15,177	17,222	15,535
Income tax (benefit) provision	29,873	20,259	36,336
Net Income	98,739	67,275	42,865
Parent Company
Income
Interest/other	679	484	2,104
Dividends from subsidiary Bank	0	0	0
Gain on sale of Visa stock	0	0	15,153
Total Interest Income	679	484	17,257
Interest expense	3,368	3,165	2,499
Other expenses	651	879	649
(Loss) income before income taxes and equity in undistributed income of subsidiaries	(3,340)	(3,560)	14,109
Income tax (benefit) provision	(702)	(747)	4,938
(Loss) Income before equity in undistributed income of subsidiaries	(2,638)	(2,813)	9,171
Equity in undistributed income of subsidiaries	101,377	70,088	33,694
Net Income	$ 98,739	$ 67,275	$ 42,865

Seacoast Banking Corporation _5

Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Summary of Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	$ 98,739	$ 67,275	$ 42,865
Gain on sale of Visa Class B stock	0	0	(15,153)
Net (increase) decrease in other assets	(5,614)	10,331	(5,506)
Net increase (decrease) in other liabilities	(4,206)	8,827	(21,432)
Net Cash Provided by Operating Activities	117,745	129,608	48,909
Cash Flows From Investing Activities
Purchase of Visa Class B stock	0	0	(6,180)
Net Cash Used in Investing Activities	(321,341)	(174,600)	(245,576)
Cash Flows From Financing Activities
Issuance of common stock, net of related expense	0	0	55,641
Net Cash Provided by Financing Activities	212,176	51,439	196,527
Net increase (decrease) in cash and cash equivalents	8,580	6,447	(140)
Cash and cash equivalents at beginning of year	115,951	109,504	109,644
Cash and Cash Equivalents at End of Year	124,531	115,951	109,504
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	46,130	28,301	15,125
Parent Company
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	98,739	67,275	42,865
Equity in undistributed income of subsidiaries	(101,377)	(70,088)	(33,694)
Gain on sale of Visa Class B stock	0	0	(15,153)
Net (increase) decrease in other assets	(738)	(10,045)	1,415
Net increase (decrease) in other liabilities	265	(3,431)	4,005
Net Cash Provided by Operating Activities	(3,111)	(16,289)	(562)
Cash Flows From Investing Activities
Net cash paid for bank acquisition	0	(6,558)	(27,862)
Investment in unconsolidated subsidiary	(10)	0	0
Purchase of Visa Class B stock	0	0	(6,180)
Proceeds from sale of Visa Class B stock	0	21,333	0
Dividends from bank subsidiary	18,082	0	0
(Increase) decrease in securities purchased under agreement to resell, maturing within 30 days, net	(12,849)	(421)	(20,475)
Net Cash Used in Investing Activities	5,223	14,354	(54,517)
Cash Flows From Financing Activities
Issuance of common stock, net of related expense	0	0	55,641
Stock based employment benefit plans	(2,239)	978	(56)
Net Cash Provided by Financing Activities	(2,239)	978	55,585
Net increase (decrease) in cash and cash equivalents	(127)	(957)	506
Cash and cash equivalents at beginning of year	197	1,154	648
Cash and Cash Equivalents at End of Year	70	197	1,154
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	$ 3,186	$ 2,936	$ 2,205

Contingent Liabilities and Co_3

Contingent Liabilities and Commitments with Off-Balance Sheet Risk - Summary of Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Contract or Notional Amount
Commitments to extend credit	$ 1,018,020	$ 982,739
Unfunded limited partner equity commitment	6,011	7,252
Secured
Contract or Notional Amount
Standby letters of credit and financial guarantees written	13,073	17,736
Unsecured
Contract or Notional Amount
Standby letters of credit and financial guarantees written	$ 663	$ 847

Contingent Liabilities and Co_4

Contingent Liabilities and Commitments with Off-Balance Sheet Risk - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitment to extend credit amount	$ 1,018,020	$ 982,739
Unfunded limited partner equity commitment	$ 6,011	7,252
Minimum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitment to extend credit fixed interest rate	3.24%
Maximum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitment to extend credit fixed interest rate	6.50%
Fixed Interest Rate Credit Risk
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 39,400
Secured Credit Risk
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Secured amount of commitment to extend credit	399,700
Secured
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Collateral held for secured standby letters of credit	$ 13,200	$ 19,100

Fair Value - Fair Value Measure

Fair Value - Fair Value Measurements for Items Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale (at fair value)	$ 946,855	$ 865,831
Loans held for sale	20,029	11,873
Other real estate owned	12,390	12,802
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale (at fair value)	946,855	865,831
Loans held for sale	20,029	11,873
Equity securities	6,392	6,205
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale (at fair value)	100	100
Loans held for sale	0	0
Equity securities	6,392	6,205
Fair Value, Measurements, Recurring | Significant Other Observable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale (at fair value)	946,755	865,731
Loans held for sale	20,029	11,873
Equity securities	0	0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale (at fair value)	0	0
Loans held for sale	0	0
Equity securities	0	0
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	5,123	8,590
Other real estate owned	12,390	12,802
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Other real estate owned	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	1,419	2,290
Other real estate owned	241	297
Fair Value, Measurements, Nonrecurring | Significant Other Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	3,704	6,300
Other real estate owned	$ 12,149	$ 12,505

Fair Value - Fair Value of Cont

Fair Value - Fair Value of Contractual Balance and Gains or Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Aggregate fair value	$ 20,029	$ 11,873
Contractual balance	19,445	11,562
Excess	$ 584	$ 311

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Average capitalization rate	7.40%
Specific reserve for impaired loans	$ 35,154	$ 32,423	$ 27,122	$ 23,400
Other real estate owned and other reductions classified as level 3 transfers in	4,700
Paydowns, chargeoffs and writedowns of level 3	1,900
Additions to level 3	4,000
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired loans	5,100	8,600
Specific reserve for impaired loans	2,900	$ 2,700
Paydowns, chargeoffs and writedowns of level 3	400
Additions to level 3	5,500
Sales of level 3 investments	$ 5,500

Fair Value - Summary of Carryin

Fair Value - Summary of Carrying Value and Fair Value of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financial Assets
Debt securities held to maturity	$ 261,369	$ 357,949
Loans, net	5,163,250	4,792,791
Quoted Prices in Active Markets for Identical Assets
Financial Assets
Debt securities held to maturity	0	0
Time deposits with other banks	0	0
Loans, net	0	0
Financial Liabilities
Deposits	0	0
Federal Home Loan Bank (FHLB) borrowings	0	0
Subordinated debt	0	0
Significant Other Observable Inputs
Financial Assets
Debt securities held to maturity	262,213	349,895
Time deposits with other banks	0	0
Loans, net	0	0
Financial Liabilities
Deposits	0	0
Federal Home Loan Bank (FHLB) borrowings	0	0
Subordinated debt	64,017	61,224
Significant Other Unobservable Inputs
Financial Assets
Debt securities held to maturity	0	0
Time deposits with other banks	3,744	8,132
Loans, net	5,139,491	4,835,248
Financial Liabilities
Deposits	5,584,621	5,172,098
Federal Home Loan Bank (FHLB) borrowings	314,995	380,027
Subordinated debt	0	0
Carrying Amount
Financial Assets
Debt securities held to maturity	261,369	357,949
Time deposits with other banks	3,742	8,243
Loans, net	5,158,127	4,784,201
Financial Liabilities
Deposits	5,584,753	5,177,240
Federal Home Loan Bank (FHLB) borrowings	315,000	380,000
Subordinated debt	$ 71,085	$ 70,804

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Shares excluded from computation of diluted EPS (in shares)	491	483	274
Basic earnings per share
Net Income	$ 98,739	$ 67,275	$ 42,865
Total weighted average common stock outstanding (in shares)	51,449	47,969	42,613
Net income per share (in dollars per share)	$ 1.92	$ 1.40	$ 1.01
Diluted earnings per share
Net Income	$ 98,739	$ 67,275	$ 42,865
Total weighted average common stock outstanding (in shares)	51,449	47,969	42,613
Add: Dilutive effect of employee restricted stock and stock options (in shares)	580	779	737
Total weighted average diluted stock outstanding (in shares)	52,029	48,748	43,350
Net income per share (in dollars per share)	$ 1.90	$ 1.38	$ 0.99

Business Combinations - Additio

Business Combinations - Additional Information (Details) $ / shares in Units, $ in Thousands	Oct. 19, 2018USD ($)branch$ / shares	Nov. 03, 2017USD ($)branch$ / shares	Oct. 20, 2017USD ($)branch$ / shares	Apr. 07, 2017USD ($)branch$ / shares	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Goodwill, nondeductible for tax purposes					$ 205,286	$ 204,753	$ 147,578	$ 64,649
Acquisition costs					$ 1,000	$ 9,700	$ 12,900
Gulf Shore Banc shares Inc
Business Acquisition [Line Items]
Number of branches acquired | branch				3
Total assets acquired				$ 357,649
Loans, net				250,876
Deposits acquired				$ 285,350
Percentage of common stock acquired				100.00%
Cash portion, cash per share for common stock converted (in dollars per share) | $ / shares				$ 1.47
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)				0.4807
Multiplied by common stock price per share (in dollars per share) | $ / shares				$ 23.94
Goodwill, nondeductible for tax purposes				$ 37,098
NorthStar Bank
Business Acquisition [Line Items]
Number of branches acquired | branch			3
Percentage of common stock acquired			100.00%
Cash portion, cash per share for common stock converted (in dollars per share) | $ / shares			$ 2.40
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)			0.5605
Multiplied by common stock price per share (in dollars per share) | $ / shares			$ 24.92
Palm Beach Community Bank
Business Acquisition [Line Items]
Number of branches acquired | branch		4
Percentage of common stock acquired		100.00%
Cash portion, cash per share for common stock converted (in dollars per share) | $ / shares		$ 6.26
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)		0.9240
Multiplied by common stock price per share (in dollars per share) | $ / shares		$ 24.31
First Green Bancorp, Inc.
Business Acquisition [Line Items]
Number of branches acquired | branch	7
Percentage of common stock acquired	100.00%
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)	0.7324
Multiplied by common stock price per share (in dollars per share) | $ / shares	$ 26.87
Goodwill, nondeductible for tax purposes	$ 56,700
As Adjusted | NorthStar Bank
Business Acquisition [Line Items]
Total assets acquired			$ 216,278
Loans, net			136,832
Deposits acquired			182,443
Goodwill, nondeductible for tax purposes			$ 12,305
As Adjusted | Palm Beach Community Bank
Business Acquisition [Line Items]
Total assets acquired		$ 356,990
Loans, net		270,318
Deposits acquired		268,633
Goodwill, nondeductible for tax purposes		$ 34,504
As Adjusted | First Green Bancorp, Inc.
Business Acquisition [Line Items]
Total assets acquired	817,386
Loans, net	631,497
Deposits acquired	624,289
Goodwill, nondeductible for tax purposes	$ 56,731

Business Combinations - Purchas

Business Combinations - Purchase Price (Details) $ / shares in Units, $ in Thousands	Oct. 19, 2018USD ($)$ / sharesshares	Nov. 03, 2017USD ($)$ / sharesshares	Oct. 20, 2017USD ($)$ / sharesshares	Apr. 07, 2017USD ($)$ / sharesshares
Gulf Shore Banc shares Inc
Business Acquisition [Line Items]
Value of shares exchanged for cash				$ 8,034
Number of shares outstanding (in shares) | shares				5,464,000
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)				0.4807
Number of shares of common stock issued (in shares) | shares				2,627,000
Multiplied by common stock price per share (in dollars per share) | $ / shares				$ 23.94
Value of common stock issued				$ 62,883
Total purchase price				$ 70,917
NorthStar Bank
Business Acquisition [Line Items]
Value of shares exchanged for cash			$ 4,701
Number of shares outstanding (in shares) | shares			1,958,000
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)			0.5605
Number of shares of common stock issued (in shares) | shares			1,098,000
Multiplied by common stock price per share (in dollars per share) | $ / shares			$ 24.92
Value of common stock issued			$ 27,353
Cash paid for vested Corporation stock options			801
Total purchase price			$ 32,855
Palm Beach Community Bank
Business Acquisition [Line Items]
Value of shares exchanged for cash		$ 15,694
Number of shares outstanding (in shares) | shares		2,507,000
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)		0.9240
Number of shares of common stock issued (in shares) | shares		2,316,000
Multiplied by common stock price per share (in dollars per share) | $ / shares		$ 24.31
Value of common stock issued		$ 56,312
Total purchase price		$ 72,006
First Green Bancorp, Inc.
Business Acquisition [Line Items]
Number of shares outstanding (in shares) | shares	5,462,000
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)	0.7324
Number of shares of common stock issued (in shares) | shares	4,000,000
Multiplied by common stock price per share (in dollars per share) | $ / shares	$ 26.87
Value of common stock issued	$ 107,486
Cash paid for vested Corporation stock options	6,558
Total purchase price	$ 114,044

Business Combinations - Fair Va

Business Combinations - Fair Value of the Assets Purchased, Including Goodwill, and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Oct. 19, 2018	Dec. 31, 2017	Nov. 03, 2017	Oct. 20, 2017	Apr. 07, 2017	Dec. 31, 2016
Assets:
Goodwill	$ 205,286	$ 204,753		$ 147,578				$ 64,649
Gulf Shore Banc shares Inc
Assets:
Cash							$ 38,267
Time deposits with other banks							17,273
Investment securities							316
Loans, net							250,876
Fixed assets							1,307
Other real estate owned							13
Core deposit intangibles							3,927
Goodwill							37,098
Other assets							8,572
Total assets							357,649
Liabilities:
Deposits							285,350
Other liabilities							1,382
Total liabilities							$ 286,732
NorthStar Bank | Measurement Period Adjustments
Assets:
Cash						$ 0
Investment securities						0
Loans, net						0
Fixed assets						0
Core deposit intangibles						0
Goodwill						(99)
Other assets						99
Total assets						0
Liabilities:
Deposits						0
Other liabilities						0
Total liabilities						0
Palm Beach Community Bank | Measurement Period Adjustments
Assets:
Cash					$ 0
Investment securities					0
Loans, net					(1,772)
Fixed assets					0
Core deposit intangibles					0
Goodwill					1,076
Other assets					696
Total assets					0
Liabilities:
Deposits					0
Other liabilities					0
Total liabilities					0
First Green Bancorp, Inc.
Assets:
Goodwill			$ 56,700
First Green Bancorp, Inc. | Measurement Period Adjustments
Assets:
Cash			0
Investment securities			0
Loans, net			0
Fixed assets			0
Other real estate owned			0
Core deposit intangibles			(676)
Goodwill			533
Other assets			178
Total assets			35
Liabilities:
Deposits			0
Other liabilities			35
Total liabilities			35
As Adjusted | NorthStar Bank
Assets:
Cash						5,485
Investment securities						56,123
Loans, net						136,832
Fixed assets						2,637
Core deposit intangibles						1,275
Goodwill						12,305
Other assets						1,621
Total assets						216,278
Liabilities:
Deposits						182,443
Other liabilities						980
Total liabilities						183,423
As Adjusted | Palm Beach Community Bank
Assets:
Cash					9,301
Investment securities					22,098
Loans, net					270,318
Fixed assets					7,641
Core deposit intangibles					2,523
Goodwill					34,504
Other assets					10,605
Total assets					356,990
Liabilities:
Deposits					268,633
Other liabilities					16,351
Total liabilities					284,984
As Adjusted | First Green Bancorp, Inc.
Assets:
Cash			29,434
Investment securities			32,145
Loans, net			631,497
Fixed assets			16,828
Other real estate owned			410
Core deposit intangibles			9,494
Goodwill			56,731
Other assets			40,847
Total assets			817,386
Liabilities:
Deposits			624,289
Other liabilities			79,053
Total liabilities			703,342
Initially Reported | NorthStar Bank
Assets:
Cash						5,485
Investment securities						56,123
Loans, net						136,832
Fixed assets						2,637
Core deposit intangibles						1,275
Goodwill						12,404
Other assets						1,522
Total assets						216,278
Liabilities:
Deposits						182,443
Other liabilities						980
Total liabilities						$ 183,423
Initially Reported | Palm Beach Community Bank
Assets:
Cash					9,301
Investment securities					22,098
Loans, net					272,090
Fixed assets					7,641
Core deposit intangibles					2,523
Goodwill					33,428
Other assets					9,909
Total assets					356,990
Liabilities:
Deposits					268,633
Other liabilities					16,351
Total liabilities					$ 284,984
Initially Reported | First Green Bancorp, Inc.
Assets:
Cash			29,434
Investment securities			32,145
Loans, net			631,497
Fixed assets			16,828
Other real estate owned			410
Core deposit intangibles			10,170
Goodwill			56,198
Other assets			40,669
Total assets			817,351
Liabilities:
Deposits			624,289
Other liabilities			79,018
Total liabilities			$ 703,307

Business Combinations - Fair _2

Business Combinations - Fair Value of Acquired Loans (Details) - USD ($) $ in Thousands	Oct. 19, 2018	Nov. 03, 2017	Oct. 20, 2017	Apr. 07, 2017
Gulf Shore Banc shares Inc
Business Acquisition [Line Items]
Book Balance				$ 256,876
Fair Value				250,876
Gulf Shore Banc shares Inc | Commercial real estate
Business Acquisition [Line Items]
Book Balance				106,729
Fair Value				103,905
Gulf Shore Banc shares Inc | Commercial loans
Business Acquisition [Line Items]
Book Balance				32,137
Fair Value				32,247
Gulf Shore Banc shares Inc | Single family residential real estate
Business Acquisition [Line Items]
Book Balance				101,281
Fair Value				99,598
Gulf Shore Banc shares Inc | Construction/development/land
Business Acquisition [Line Items]
Book Balance				13,175
Fair Value				11,653
Gulf Shore Banc shares Inc | Consumer and other loans
Business Acquisition [Line Items]
Book Balance				3,554
Fair Value				3,473
Gulf Shore Banc shares Inc | PCI Loans
Business Acquisition [Line Items]
Book Balance				0
Fair Value				$ 0
NorthStar Bank
Business Acquisition [Line Items]
Book Balance			$ 143,444
Fair Value			136,832
NorthStar Bank | Commercial real estate
Business Acquisition [Line Items]
Book Balance			73,139
Fair Value			69,554
NorthStar Bank | Commercial loans
Business Acquisition [Line Items]
Book Balance			31,200
Fair Value			30,854
NorthStar Bank | Single family residential real estate
Business Acquisition [Line Items]
Book Balance			15,111
Fair Value			15,096
NorthStar Bank | Construction/development/land
Business Acquisition [Line Items]
Book Balance			11,706
Fair Value			10,390
NorthStar Bank | Consumer and other loans
Business Acquisition [Line Items]
Book Balance			6,761
Fair Value			6,645
NorthStar Bank | PCI Loans
Business Acquisition [Line Items]
Book Balance			5,527
Fair Value			$ 4,293
Palm Beach Community Bank
Business Acquisition [Line Items]
Book Balance		$ 275,567
Fair Value		270,318
Palm Beach Community Bank | Commercial real estate
Business Acquisition [Line Items]
Book Balance		134,705
Fair Value		132,089
Palm Beach Community Bank | Commercial loans
Business Acquisition [Line Items]
Book Balance		36,076
Fair Value		35,876
Palm Beach Community Bank | Single family residential real estate
Business Acquisition [Line Items]
Book Balance		30,153
Fair Value		30,990
Palm Beach Community Bank | Construction/development/land
Business Acquisition [Line Items]
Book Balance		69,686
Fair Value		67,425
Palm Beach Community Bank | Consumer and other loans
Business Acquisition [Line Items]
Book Balance		179
Fair Value		172
Palm Beach Community Bank | PCI Loans
Business Acquisition [Line Items]
Book Balance		4,768
Fair Value		$ 3,766
First Green Bancorp, Inc.
Business Acquisition [Line Items]
Book Balance	$ 668,216
Fair Value	631,497
First Green Bancorp, Inc. | Commercial real estate
Business Acquisition [Line Items]
Book Balance	437,767
Fair Value	406,613
First Green Bancorp, Inc. | Commercial loans
Business Acquisition [Line Items]
Book Balance	56,288
Fair Value	54,973
First Green Bancorp, Inc. | Single family residential real estate
Business Acquisition [Line Items]
Book Balance	101,674
Fair Value	101,119
First Green Bancorp, Inc. | Construction/development/land
Business Acquisition [Line Items]
Book Balance	61,195
Fair Value	58,385
First Green Bancorp, Inc. | Consumer and other loans
Business Acquisition [Line Items]
Book Balance	9,156
Fair Value	8,942
First Green Bancorp, Inc. | PCI Loans
Business Acquisition [Line Items]
Book Balance	2,136
Fair Value	$ 1,465

Business Combinations - Purch_2

Business Combinations - Purchased Credit Impaired Loans (Details) - USD ($) $ in Thousands	Oct. 19, 2018	Nov. 03, 2017	Oct. 20, 2017
NorthStar Bank
Business Acquisition [Line Items]
Total purchased credit-impaired loan acquired			$ 136,832
NorthStar Bank | PCI Loans
Business Acquisition [Line Items]
Contractually required principal and interest			5,596
Non-accretable difference			(689)
Cash flows expected to be collected			4,907
Accretable yield			(614)
Total purchased credit-impaired loan acquired			$ 4,293
Palm Beach Community Bank
Business Acquisition [Line Items]
Total purchased credit-impaired loan acquired		$ 270,318
Palm Beach Community Bank | PCI Loans
Business Acquisition [Line Items]
Contractually required principal and interest		4,768
Non-accretable difference		(1,002)
Cash flows expected to be collected		3,766
Accretable yield		0
Total purchased credit-impaired loan acquired		$ 3,766
First Green Bancorp, Inc.
Business Acquisition [Line Items]
Total purchased credit-impaired loan acquired	$ 631,497
First Green Bancorp, Inc. | PCI Loans
Business Acquisition [Line Items]
Contractually required principal and interest	2,136
Non-accretable difference	(671)
Cash flows expected to be collected	1,465
Accretable yield	0
Total purchased credit-impaired loan acquired	$ 1,465

Business Combinations - Pro-For

Business Combinations - Pro-Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Net interest income	$ 238,498	$ 223,508
Net income available to common shareholders	$ 82,307	$ 62,188
EPS - basic (in dollars per share)	$ 1.61	$ 1.24
EPS - diluted (in dollars per share)	$ 1.58	$ 1.22

Uncategorized Items - sbcf20191

Label	Element	Value
Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 0
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(115,000)
Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 115,000