Seacoast Banking Corporation of Florida (SBCF) 10-K 1 Mar 21 2020 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Jan. 31, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 1,081,009,362
Entity Common Stock, Shares Outstanding		55,249,870
Documents Incorporated by Reference	Certain portions of the registrant’s Proxy Statement for the 2021 Annual Meeting of Shareholders (the “2021 Proxy Statement”) are incorporated by reference into Part III, Items 10 through 14 of this report. Other than those portions of the 2021 Proxy Statement specifically incorporated by reference herein pursuant to Items 10 through 14, no other portions of the 2021 Proxy Statement shall be deemed so incorporated.
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000730708

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest and dividends on securities
Taxable	$ 29,718	$ 35,354	$ 37,860
Nontaxable	454	555	884
Interest and fees on loans	254,366	250,535	199,984
Interest on interest bearing deposits and other investments	2,497	3,379	2,670
Total Interest Income	287,035	289,823	241,398
Interest Expense
Interest on deposits	6,920	16,621	8,763
Interest on time certificates	13,365	21,776	11,684
Interest on securities sold under agreement to repurchase	283	1,431	1,804
Interest on Federal Home Loan Bank (“FHLB”) borrowings	1,540	3,010	4,468
Interest on subordinated debt	2,184	3,367	3,164
Total Interest Expense	24,292	46,205	29,883
Net Interest Income	262,743	243,618	211,515
Provision for credit losses	38,179	10,999	11,730
Net Interest Income After Provision for Credit Losses	224,564	232,619	199,785
Noninterest Income (see “Note N - Noninterest Income and Expenses”)
Securities gains (losses), net (includes net gains of $0.2 million for 2020, net gains of $6.2 million for 2019 and net losses of $0.1 million for 2018 in other comprehensive income reclassifications)	1,235	1,217	(623)
Other	60,335	55,515	50,645
Total Noninterest Income	61,570	56,732	50,022
Noninterest Expense (See “Note N - Noninterest Income and Expenses”)	185,552	160,739	162,273
Income Before Income Taxes	100,582	128,612	87,534
Income taxes	22,818	29,873	20,259
Net Income	$ 77,764	$ 98,739	$ 67,275
Net income per share of common stock
Diluted (in dollars per share)	$ 1.44	$ 1.90	$ 1.38
Basic (in dollars per share)	$ 1.45	$ 1.92	$ 1.40
Average common shares outstanding
Diluted (in shares)	53,930	52,029	48,748
Basic (in shares)	53,502	51,449	47,969

CONSOLIDATED STATEMENTS OF IN_2

CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Gains (losses) included in other comprehensive income reclassifications	$ 0.2	$ 6.2	$ (0.1)

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 77,764	$ 98,739	$ 67,275
Available-for-sale securities:
Unrealized gains (losses) on available-for-sale securities, net of tax expense of $5.0 million in 2020, tax expense of $5.9 million in 2019 and tax benefit of $3.5 million in 2018	16,628	19,016	(9,815)
Reclassification of unrealized losses on securities transferred to available-for-sale upon adoption of new accounting pronouncement, net of tax benefit of $154 thousand in 2019	0	(730)	0
Amortization of unrealized losses on securities transferred to held-to-maturity, net of tax expense of $40 thousand, $87 thousand, and $142 thousand, respectively	184	175	408
Reclassification adjustment for (gains) losses included in net income, net of tax expense of $314 thousand in 2020, tax expense of $95 thousand in 2019 and tax benefit of $37 thousand in 2018	(782)	(936)	448
Available-for-sale securities, net of tax	16,030	17,525	(8,959)
Unrealized losses on derivatives designated as cash flow hedges, net of reclassifications to income, net of tax expense of $42 thousand	(125)	0	0
Total other comprehensive income (loss)	15,905	17,525	(8,959)
Comprehensive Income	$ 93,669	$ 116,264	$ 58,316

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) on available-for-sale securities, tax expense (benefit)	$ 5,000	$ 5,900	$ (3,500)
Reclassification of unrealized losses on securities transferred to available-for-sale, tax benefit		154
Amortization of unrealized losses on securities transferred to held-to-maturity, tax expense	40	87	142
Reclassification adjustment for (gains) losses included in net income, tax expense (benefit)	314	$ 95	$ (37)
Unrealized losses on cash flow hedging derivatives, net of reclassifications, tax expense	$ 42

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 86,630	$ 89,843
Interest bearing deposits with other banks	317,458	34,688
Total cash and cash equivalents	404,088	124,531
Time deposits with other banks	750	3,742
Securities available-for-sale (at fair value)	1,398,157	946,855
Securities held-to-maturity (fair value $192.2 million in 2020 and $262.2 million in 2019)	184,484	261,369
Total debt securities	1,582,641	1,208,224
Loans held for sale (at fair value)	68,890	20,029
Loans	5,735,349	5,198,404
Less: Allowance for credit losses	(92,733)	(35,154)
Loans, net of allowance for credit losses	5,642,616	5,163,250
Bank premises and equipment, net	75,117	66,615
Other real estate owned	12,750	12,390
Goodwill	221,176	205,286
Other intangible assets, net	16,745	20,066
Bank owned life insurance	131,776	126,181
Net deferred tax assets	23,629	16,457
Other assets	162,214	141,740
Total Assets	8,342,392	7,108,511
Deposits
Noninterest demand	2,289,787	1,590,493
Interest-bearing demand	1,566,069	1,181,732
Savings	689,179	519,152
Money market	1,556,370	1,108,363
Other time deposits	425,878	504,837
Brokered time certificates	233,815	472,857
Time certificates of more than $250,000	171,463	207,319
Total Deposits	6,932,561	5,584,753
Securities sold under agreements to repurchase, maturing within 30 days	119,609	86,121
Federal Home Loan Bank (“FHLB”) borrowings	0	315,000
Subordinated debt	71,365	71,085
Other liabilities	88,455	65,913
Total Liabilities	7,211,990	6,122,872
Commitments and Contingencies (See “Note J - Borrowings and “Note Q - Contingent Liabilities and Commitments with Off-Balance Sheet Risk”)
Shareholders' Equity
Common stock, par value $0.10 per share authorized 120,000,000 shares, issued 55,584,979 and outstanding 55,243,226 shares in 2020 and authorized 120,000,000 shares, issued 51,760,617 and outstanding 51,513,733 shares in 2019	5,524	5,151
Additional paid-in capital	856,092	786,242
Retained earnings	256,701	195,813
Less: Treasury stock (341,753 shares in 2020 and 246,884 shares in 2019), at cost	(8,285)	(6,032)
Total shareholders' equity, before accumulated other comprehensive income (loss), net	1,110,032	981,174
Accumulated other comprehensive income, net	20,370	4,465
Total Shareholders' Equity	1,130,402	985,639
Total Liabilities & Shareholders' Equity	$ 8,342,392	$ 7,108,511

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Held for investment, fair value, total	$ 192,179	$ 262,213
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)	55,584,979	51,760,617
Common stock, shares outstanding (in shares)	55,243,226	51,513,733
Treasury stock (in shares)	341,753	246,884

CONSOLIDATED STATEMENT OF CASH

CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities
Net Income	$ 77,764	$ 98,739	$ 67,275
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,020	6,421	6,353
Amortization of premiums and discounts on securities, net	5,019	2,548	3,196
Amortization of operating lease right-of-use assets	4,362	4,117	0
Other amortization and accretion, net	(8,667)	(2,005)	(1,158)
Stock based compensation	7,304	7,243	7,823
Origination of loans designated for sale	(511,706)	(329,177)	(303,928)
Sale of loans designated for sale	477,178	333,591	326,328
Provision for credit losses	38,179	10,999	11,730
Deferred income taxes	(4,926)	6,791	459
(Gains) losses on sale of securities	(1,096)	(1,031)	485
Gains on sale of loans	(13,930)	(9,794)	(8,961)
Losses (gains) on sale and write-downs of other real estate owned	1,139	(432)	(107)
Losses on disposition of fixed assets	791	511	1,235
Bank owned life insurance death benefits	0	(956)	(280)
Changes in operating assets and liabilities, net of effects from acquired companies:
Net (increase) decrease in other assets	(35,555)	(5,614)	10,331
Net (decrease) increase in other liabilities	18,776	(4,206)	8,827
Net Cash Provided by Operating Activities	60,652	117,745	129,608
Cash Flows From Investing Activities
Maturities and repayments of available-for-sale debt securities	304,064	101,674	141,223
Maturities and repayments of held-to-maturity debt securities	75,861	42,495	58,315
Proceeds from sale of available-for-sale debt securities	96,732	202,724	64,366
Purchases of available-for-sale debt securities	(830,300)	(309,461)	(104,650)
Maturities of time deposits with other banks	2,992	4,501	4,310
Net new loans and principal repayments	(79,100)	(109,614)	(365,816)
Purchases of loans held for investment	0	(270,791)	(19,541)
Proceeds from the sale of other real estate owned	8,521	6,509	10,072
Additions to other real estate owned	(2,557)	0	0
Proceeds from sale of FHLB and Federal Reserve Bank Stock	39,185	74,120	44,731
Purchase of FHLB and Federal Reserve Bank Stock	(28,278)	(75,193)	(51,505)
Proceeds from sale of Visa Class B stock	0	0	21,333
Redemption of bank owned life insurance	0	14,218	4,232
Net cash from bank acquisitions	71,965	0	22,349
Additions to bank premises and equipment	(1,587)	(2,523)	(4,019)
Net Cash Used in Investing Activities	(342,502)	(321,341)	(174,600)
Cash Flows From Financing Activities
Net increase (decrease) in deposits	844,405	407,513	(39,769)
Net increase (decrease) in repurchase agreements	33,488	(128,202)	(1,771)
Net (decrease) increase in FHLB borrowings with original maturities of three months or less	(235,000)	(67,000)	32,000
Repayments of FHLB borrowings with original maturities of more than three months	(115,000)	(63,000)	0
Proceeds from FHLB borrowings with original maturities of more than three months	35,000	65,000	60,000
Stock based employee benefit plans	(1,486)	(2,135)
Stock based employee benefit plans			979
Dividends paid	0	0	0
Net Cash Provided by Financing Activities	561,407	212,176	51,439
Net increase in cash and cash equivalents	279,557	8,580	6,447
Cash and Cash Equivalents at Beginning of Year	124,531	115,951	109,504
Cash and Cash Equivalents at End of Year	404,088	124,531	115,951
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	23,548	46,130	28,301
Cash paid during the period for taxes	27,712	16,000	13,200
Recognition of operating lease right-of-use assets	2,095	30,301	0
Recognition of operating lease liabilities	2,095	34,627	0
Supplemental disclosure of non-cash investing activities:
Transfer of debt securities from held-to-maturity to available-for-sale	0	52,796	0
Transfer from loans to other real estate owned	5,624	5,665	5,549
Transfer from bank premises to other real estate owned	1,289	0	9,168
Transfer from loans held for investment to loans held for sale	$ 0	$ 801	$ 0

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect Adjustment	Common Stock	Paid-in Capital	Retained Earnings	Retained EarningsCumulative Effect Adjustment	Treasury Stock	Accumulated Other Comprehensive Income (Loss), Net
Beginning balance (in shares) at Dec. 31, 2017			46,918
Beginning 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)
Reclassification of disproportionate tax effects upon adoption of new accounting pronouncement	0				(115)			115
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	$ (16,876)	$ 5,151	786,242	195,813	$ (16,876)	(6,032)	4,465
Comprehensive income	93,669				77,764			15,905
Stock based compensation expense (in shares)			39
Stock based compensation expense	7,304			7,304
Common stock issued for stock based employee benefit plans (in shares)			465
Common stock issued for stock based employee benefit plans	(2,252)		$ 51	(50)			(2,253)
Common stock issued for stock options (in shares)			62
Common stock issued for stock options	766		$ 6	760
Issuance of common stock, net of related expenses (in shares)			3,163
Issuance of common stock, pursuant to acquisitions	62,152		$ 316	61,836
Ending balance (in shares) at Dec. 31, 2020			55,243
Ending balance at Dec. 31, 2020	$ 1,130,402		$ 5,524	$ 856,092	$ 256,701		$ (8,285)	$ 20,370

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
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 and a network of traditional branch offices and 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 credit losses, acquisition accounting and purchased loans, intangible assets and impairment testing, other fair value measurements, and contingent liabilities. Recently Adopted Accounting Pronouncements: On January 1, 2020, the Company adopted ASC Topic 326 - Financial Instruments - Credit Losses, which replaced the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss (“CECL”) methodology. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including loan receivables and held-to-maturity (“HTM”) debt securities. It also applies to off-balance sheet credit exposure such as loan commitments, standby letters of credit, financial guarantees and other similar instruments. In addition, ASC Topic 326 changed the accounting for impairment of available-for-sale (“AFS”) debt securities. The Company adopted ASC Topic 326 using the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. Results for the reporting period beginning after January 1, 2020 are presented under ASC Topic 326, while prior amounts continue to be reported in accordance with previously applicable GAAP. The following table reflects the cumulative effect of adoption: (in thousands) December 31, 2019 CECL adoption impact January 1, 2020 Loans $ 5,198,404 $ (706) $ 5,197,698 Allowance for credit losses 35,154 21,226 56,380 Reserve for unfunded commitments 140 1,837 1,977 Deferred tax assets 16,457 (5,481) 10,976 Retained earnings 195,813 (16,876) 178,937 ASC Topic 326 introduced new definitions and criteria for categorizing purchased loans. Loans that, as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination are classified as purchased credit deteriorated (“PCD”). Acquired loans which do not meet the definition of PCD are classified by the Company as acquired Non-PCD. At the date of adoption, the Company reclassified all loans previously classified as purchased credit impaired (“PCI”) to PCD, and increased the allowance $0.7 million with a corresponding adjustment to these loans' amortized cost basis. The remaining noncredit discount on loans previously classified as PCI was $0.9 million, which will be accreted into interest income over the remaining life of the loans. Under CECL, the Company estimates the allowance using relevant available information, from both internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Historical credit losses provide the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level, loan to value ratios, borrower credit characteristics, loan seasoning or term as well as for changes in environmental conditions, such as changes in unemployment rates, property values, occupancy rates, and other macroeconomic metrics. For loans analyzed on a collective basis, the Company has developed an allowance model based on an analysis of the probability of default (“PD”) and loss given default (“LGD”) to determine an expected loss by loan segment. PDs and LGDs are developed by analyzing the average historical loss migration of loans to default. The Company excludes accrued interest on loans from its determination of allowance. The allowance estimation process also applies an economic forecast scenario over a three year forecast period. The forecast may utilize one scenario or a composite of scenarios based on management's judgment and expectations around the current and future macroeconomic outlook. Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term of a loan excludes expected extensions, renewals, and modification unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower or the extension or renewal options are included in the original or modified contract at the reporting date and not unconditionally cancellable by the Company. 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. Adjustments may be made to baseline reserves for some of the loan pools based on an assessment of internal and external influences on credit quality not fully reflected in the quantitative components of the allowance model. These influences may include elements such as changes in concentration, macroeconomic conditions, recent observable asset quality trends, staff turnover, regional market conditions, employment levels and loan growth. Based upon management's assessments of these factors, the Company may apply qualitative adjustments to the allowance. Loans that do not share risk characteristics are evaluated on an individual basis. Loans evaluated individually are not also included in the collective evaluation. When management determines that foreclosure is probable, expected credit losses are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate. All HTM debt securities are issued by government-sponsored entities, which are either explicitly or implicitly guaranteed by the U.S. government and have a long history of no credit losses. In addition, the credit rating on all the Company's HTM debt securities as of the date of adoption is AA+. There is no history of the government withholding or limiting support to these agencies, nor is there any indication of a change to that historical support. While the potential for default on these securities may be something greater than zero, the long history with no credit losses, the implied government guarantee of principal and interest payments and the high credit rating of the HTM portfolio provide sufficient basis for the current expectation that there is zero risk of loss if default were to occur. As a result, the Company recorded no allowance for HTM debt securities with fair value less than amortized cost basis at the date of adoption. ASC Topic 326 amended the existing other-than-temporary-impairment guidance for AFS securities, requiring credit losses to be recorded as an allowance rather than through a permanent write-down. When evaluating AFS debt securities under ASC Topic 326, the Company has evaluated whether the decline in fair value is attributed to credit losses or other factors using both quantitative and qualitative analyses, including cash flow analysis, review of credit ratings, remaining payment terms, prepayment speeds and analysis of macro-economic conditions. At the date of adoption, collateralized loan obligations had unrealized losses of $1.2 million. The collateral for these securities is first lien senior secured corporate debt, and the Company holds senior tranches rated A or higher. Based on this analysis, the Company believes that the unrealized loss position for AFS debt securities at the time of adoption was the result of both broad investment type spreads and the current rate environment. Each investment is expected to recover its price depreciation over its holding period as it moves to maturity and the Company has the intent and ability to hold these securities to maturity if necessary. As a result of this evaluation, the Company concluded that no allowance was appropriate at the date of adoption. 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 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. Seacoast Bank is a member of the Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank (“FRB”) systems. Members are required to own a certain amount of FHLB and FRB stock based on the level of borrowings and other factors, and may invest in additional amounts. Both cash and stock dividends are reported as income. Loans Held for Sale: The Company has elected to account for residential mortgage loans originated as held for sale at fair value. Changes in fair value are measured and recorded in Mortgage Banking Fees in noninterest income each period. The Company designates other loans as held for sale when it has the intent to sell them. Such loans are transferred to held for sale at the lower of cost or estimated fair value less cost to sell. At the time of transfer, write-downs on the loans are recorded as charge-offs, establishing a new cost basis upon transfer. Loans Held for Investment: 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 that 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 credit losses. Loans that, as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination are classified as purchased credit deteriorated (“PCD”). Acquired loans that do not meet the definition of PCD are classified by the Company as acquired Non-PCD. An allowance for expected credit losses on PCD loans is recorded at the date of acquisition through an adjustment to the loans' amortized cost basis. In contrast, expected credit losses on loans not considered PCD are recognized through the provision for credit losses in net income at the date of acquisition. 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. In response to the COVID-19 pandemic beginning in early 2020, rules defined in the Coronavirus Aid, Relief and Economic Security (“CARES”) Act and a joint statement issued by federal regulators in consultation with FASB provide financial institutions with the option not to apply troubled debt restructure (“TDR”) accounting to eligible loan modifications provided to borrowers affected by the economic impact of the COVID-19 pandemic. Outside of this guidance, a loan for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulty, is considered to be a TDR. The allowance for credit losses on a TDR is measured using the same method as all other loans held for investment, except when the value of a concession cannot be measured using a method other than the discounted cash flow method. When the value of a concession is measured using the discounted cash flow method, the allowance for credit losses is determined by discounting the expected future cash flows at the original interest rate of the loan. It is the Company's practice to ensure that the charge-off policy meets or exceeds regulatory minimums. Losses on unsecured consumer loans are recognized at 90 days past due, compared to the regulatory loss criteria of 120 days. In compliance with Federal Financial Institution Examination Council guidelines, secured consumer loans, including residential real estate, are typically charged-off or charged down between 120 and 180 days past due, depending on the collateral type. Commercial loans and real estate loans are typically placed on nonaccrual status when principal or interest is past due for 90 days or more, unless the loan is both secured by collateral having realizable value sufficient to discharge the debt in-full and the loan is in process of collection. Secured loans may be charged-down to the estimated value of the collateral with previously accrued unpaid interest reversed against interest income. Subsequent charge-offs may be required as a result of changes in the market value of collateral or other repayment prospects. Initial charge-off amounts are based on valuation estimates derived from appraisals, broker price opinions, or other market information. Generally, new appraisals are not received until the foreclosure process is completed; however, collateral values are evaluated periodically based on market information and incremental charge-offs are recorded if it is determined that collateral values have declined from their initial estimates. Derivative Instruments and Hedging Activities : The Company enters into derivative contracts, including swaps and floors, to meet the needs of customers who request such services and to manage the Company's exposure to interest rate fluctuations. Derivative contracts are carried at fair value and recorded in the consolidated balance sheet within other assets or other liabilities. The gain or loss resulting from changes in the fair value of interest rate swaps designated and qualifying as cash flow hedging instruments is initially reported as a component of other comprehensive income and subsequently reclassified into earnings through interest income in the same period in which the hedged transaction affects earnings. The Company discontinues hedge accounting prospectively when it is determined that the derivative contract is no longer effective in offsetting changes in the cash flows of the hedged item, the derivative expires or is terminated, management determines that the designation of the derivative as a hedging instrument is no longer appropriate or, for a cash flow hedge, the occurrence of the forecasted transaction is no longer probable. When hedge accounting on a cash flow hedge is discontinued, any subsequent changes in fair value of the derivative are recognized in earnings. The cumulative unrealized gain or loss related to a discontinuing cash flow hedge continues to be reported in AOCI and is subsequently reclassified into earnings in the same period in which the hedged transactions affects earnings, unless it is probable that the forecasted transaction will not occur by the end of the originally specified time period, in which case the cumulative unrealized gain or loss in AOCI is reclassified into earnings immediately. Cash flows resulting from derivative financial instruments that are accounted for as hedges are classified in the cash flow statement in the same category as the cash flows from the hedged items. See additional disclosures related to derivative instruments and hedging activities in “Note G – Derivatives”. 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. The Company estimates a reserve for potential losses on unfunded commitments, which is reported separately from the allowance for credit losses within other liabilities. The reserve is based upon the same quantitative and qualitative factors applied to the collectively evaluated loan portfolio. 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 the fair value of many of its assets and liabilities. 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 collateral-dependent loans, OREO, loan 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. 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 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 credit 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 maintain the facility are expensed. 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 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. Leases: Arrangements are analyzed at inception to determine the existence of a lease. Right-of-use assets (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. 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). • Wealth Management Income: 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. The Company also 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. Treasury Stock: The Company's repurchase of shares of its common stock are recorded at cost as treasury stock and result in a reduction of shareholders' equity. Activity in treasury stock represents shares traded to offset employee payroll taxes on vested shares. Shares held in treasury are used for employee share purchases through the Company's stock purchase plan. 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 5 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 three 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. 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 no

Recently Issued Accounting Stan

Recently Issued Accounting Standards, Not Adopted at December 31, 2020	12 Months Ended
	Dec. 31, 2020
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Standards, Not Adopted at December 31, 2020	Recently Issued Accounting Standards, Not Adopted at December 31, 2020 None this period.

Cash, Dividend and Loan Restric

Cash, Dividend and Loan Restrictions	12 Months Ended
	Dec. 31, 2020
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. There was no reserve requirement at December 31, 2020. The reserve requirement at December 31, 2019 was $38.7 million. The average amount of the reserve requirement in 2020 was $4.8 million compared to $7.9 million in 2019. 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, 2020, the maximum amount available for transfer from Seacoast Bank to the Company in the form of loans approximated $90.1 million, if the Company has sufficient acceptable collateral. There were no loans made to affiliates during the periods ending December 31, 2020 and 2019.

Securities

Securities	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The amortized cost, gross unrealized gains and losses and fair value of available-for-sale and held-to-maturity securities at December 31, 2020 and December 31, 2019 are summarized as follows: December 31, 2020 (In thousands) Amortized Gross Gross Fair Available-for-Sale Debt Securities U.S. Treasury securities and obligations of U.S. government agencies $ 8,250 $ 528 $ (1) $ 8,777 Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 1,038,437 23,457 (1,240) 1,060,654 Private mortgage-backed securities and collateralized mortgage obligations 89,284 2,131 (210) 91,205 Collateralized loan obligations 202,563 279 (647) 202,195 Obligations of state and political subdivisions 33,005 2,321 — 35,326 Totals $ 1,371,539 $ 28,716 $ (2,098) $ 1,398,157 Held-to-Maturity Debt Securities Mortgage-backed securities of U.S. government-sponsored entities $ 184,484 $ 7,818 $ (123) $ 192,179 Totals $ 184,484 $ 7,818 $ (123) $ 192,179 December 31, 2019 (In thousands) Amortized Gross Gross Fair Available-for-Sale Debt Securities 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 Held-to-Maturity Debt Securities 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 Proceeds from sales of debt securities during 2020 were $96.7 million, with gross gains of $2.4 million and gross losses of $1.3 million. 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. Also included in “Securities gains (losses) net” are increases of $0.1 million and $0.2 million in 2020 and 2019, respectively, and a decrease of $0.1 million in 2018, in the value of an investment in shares of a mutual fund that invests in CRA-qualified debt securities. At December 31, 2020, debt securities with a fair value of $425.1 million were pledged primarily as collateral for public deposits and secured borrowings. The amortized cost and fair value of securities at December 31, 2020, 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 Fair Amortized Fair Due in less than one year $ — $ — $ 35 $ 35 Due after one year through five years — — 11,305 11,929 Due after five years through ten years — — 8,590 9,323 Due after ten years — — 21,325 22,816 — — 41,255 44,103 Mortgage-backed securities of U.S. government-sponsored entities 184,484 192,179 1,038,437 1,060,654 Private mortgage-backed securities and collateralized mortgage obligations — — 89,284 91,205 Collateralized loan obligations — — 202,563 202,195 Totals $ 184,484 $ 192,179 $ 1,371,539 $ 1,398,157 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, at December 31, 2020, the fair value of available-for-sale debt securities with unrealized losses for which no allowance for credit losses has been recorded, and at December 31, 2019, the fair value of available-for-sale and held-to-maturity debt securities with unrealized losses for which no allowance has been recorded. December 31, 2020 Less than 12 months 12 months or longer Total (In thousands) Fair Unrealized Fair Unrealized Fair Unrealized U.S. Treasury securities and obligations of U.S. government agencies $ — $ — $ 256 $ (1) $ 256 $ (1) Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 203,405 (1,218) 569 (22) 203,974 (1,240) Private mortgage-backed securities and collateralized mortgage obligations 23,997 (210) — — 23,997 (210) Collateralized loan obligations 104,697 (102) 72,513 (545) 177,210 (647) Totals $ 332,099 $ (1,530) $ 73,338 $ (568) $ 405,437 $ (2,098) December 31, 2019 Less than 12 months 12 months or longer Total (In thousands) Fair Unrealized Fair Unrealized Fair Unrealized 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) Totals $ 312,988 $ (2,041) $ 214,951 $ (2,506) $ 527,939 $ (4,547) At December 31, 2020, the Company had unrealized losses of $1.2 million on mortgage-backed securities and collateralized mortgage obligations issued by government-sponsored entities having a fair value of $204.0 million. These securities are either explicitly or implicitly guaranteed by the U.S. Government and have a long history of no credit losses. The implied government guarantee of principal and interest payments and the high credit rating of the portfolio provide sufficient basis for the current expectation that there is no risk of loss if default were to occur. Based on the assessment of all relevant factors, the Company believes that the unrealized loss positions on these debt securities are a function of changes in investment spreads and interest rate movements and not changes in credit quality, and expects to recover the entire amortized cost basis of these securities. Therefore, at December 31, 2020, no allowance for credit losses has been recorded. At December 31, 2020, the Company had $0.6 million of unrealized losses in uncapped 3-month LIBOR floating rate collateralized loan obligations (“CLOs”) having a fair value of $177.2 million. CLOs are special purpose vehicles and those in which the Company has acquired nearly all first-lien, broadly syndicated corporate loans across a diversified band of industries while providing support to senior tranche investors. As of December 31, 2020, all positions held by the Company are in AAA and AA tranches, with average credit support of 35% and 25%, respectively. The Company evaluates the securities for potential credit losses by modeling expected loan-level defaults, recoveries, and prepayments for each CLO security. Based on the assessment of all relevant factors, the Company believes that the unrealized loss positions on these debt securities are a function of changes in investment spreads and interest rate movement and not changes in credit quality, and expects to recover the entire amortized cost basis of these securities. Therefore, at December 31, 2020, no allowance for credit losses has been recorded. At December 31, 2020, the Company had $0.2 million of unrealized losses on private label residential and commercial mortgage-backed securities and collateralized mortgage obligations having a fair value of $24.0 million. The collateral underlying these mortgage investments is primarily residential real estate. The securities have average credit support of 22%. Based on the assessment of all relevant factors, the Company believes that the unrealized loss positions on these debt securities are a function of changes in investment spreads and interest rate movements and not changes in credit quality, and expects to recover the entire amortized cost basis of these securities. Therefore, at December 31, 2020, no allowance for credit losses has been recorded. All HTM debt securities are issued by government-sponsored entities, which are either explicitly or implicitly guaranteed by the U.S. government and have a long history of no credit losses. While the potential for default on these securities may be something greater than zero, the long history with no credit losses, the implied government guarantee of principal and interest payments and the high credit rating of the HTM portfolio provide sufficient basis for the current expectation that there is no risk of loss if default were to occur. Despite the emergence of significant market changes and increasing degrees of uncertainty that occurred in the U.S. economy in 2020, there has to date been no specific impact on the agencies or changes in the nature or quality of the guarantee they provide. As a result, as of December 31, 2020, no allowance for credit losses has been recorded. Included in other assets at December 31, 2020 is $33.9 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. Accrued interest receivable on AFS and HTM debt securities of $3.2 million and $0.4 million at December 31, 2020, respectively, and $3.8 million and $0.6 million at December 31, 2019, respectively, is included in other assets. Also included in other assets is a $6.5 million investment in a mutual fund carried at fair value.

Loans

Loans	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Loans	Loans Loans held for investment are categorized into the following segments: • Construction and land development: Loans are extended to both commercial and consumer customers which are collateralized by and for the purpose of funding land development and construction projects, including 1-4 family residential construction, multi-family property and non-farm residential property where the primary source of repayment is from proceeds of the sale, refinancing or permanent financing of the property. • Commercial real estate - owner-occupied: Loans are extended to commercial customers for the purpose of acquiring real estate to be occupied by the borrower's business. These loans are collateralized by the subject property and the repayment of these loans is largely dependent on the performance of the company occupying the property. • Commercial real estate - non owner-occupied: Loans are extended to commercial customers for the purpose of acquiring commercial property where occupancy by the borrower is not their primary intent. These loans are viewed primarily as cash flow loans, collateralized by the subject property, and the repayment of these loans is largely dependent on rental income from the successful operation of the property. • Residential real estate: Loans are extended to consumer customers and collateralized primarily by 1-4 family residential properties and include fixed and variable rate mortgages, home equity mortgages, and home equity lines of credit. Loans are primarily written based on conventional loan agency guidelines, including loans that exceed agency value limitations. Sources of repayment may be from the occupant of the residential property or from cash flows on rental income from the successful operation of the property. • Commercial and financial: Loans are extended to commercial customers. The purpose of the loans can be working capital, physical asset expansion, asset acquisition or other business purposes. Loans may be collateralized by assets owned by the borrower or the borrower's business. Commercial loans are based primarily on the historical and projected cash flow of the borrower's business and secondarily on the capacity of credit enhancements, guarantees and underlying collateral provided by the borrower. • Consumer: Loans are extended to consumer customers. The segment includes both installment loans and lines of credit which may be collateralized or non-collateralized. • Paycheck Protection Program (“PPP”): Loans originated under a temporary program established by the CARES Act. Under the terms of the program, balances may be forgiven if the borrower uses the funds in a manner consistent with the program guidelines, and repayment is guaranteed by the U.S. government. With the adoption of ASC Topic 326 - Financial Instruments - Credit Losses on January 1, 2020, the Company re-evaluated the aggregation of loans into segments, and separated Commercial Real Estate - Owner Occupied from Commercial Real Estate - Non Owner Occupied. In prior years, all Commercial Real Estate loans were considered a single segment. The following tables present net loan balances by segment as of: December 31, 2020 (In thousands) Portfolio Loans Acquired Non-PCD Loans PCD Loans Total Construction and land development $ 216,420 $ 26,250 $ 2,438 $ 245,108 Commercial real estate - owner occupied 854,769 247,090 39,451 1,141,310 Commercial real estate - non-owner occupied 1,043,459 323,273 29,122 1,395,854 Residential real estate 1,155,914 176,105 10,609 1,342,628 Commercial and financial 743,846 94,627 16,280 854,753 Consumer 181,797 6,660 278 188,735 Paycheck Protection Program 515,532 51,429 — 566,961 Totals $ 4,711,737 $ 925,434 $ 98,178 $ 5,735,349 December 31, 2019 (In thousands) Portfolio Loans PULs PCI Loans Total Construction and land development $ 281,335 $ 43,618 $ 160 $ 325,113 Commercial real estate 1 1,834,811 533,943 10,217 2,378,971 Residential real estate 1,304,305 201,848 1,710 1,507,863 Commercial and financial 697,301 80,372 579 778,252 Consumer 200,166 8,039 — 208,205 Totals $ 4,317,918 $ 867,820 $ 12,666 $ 5,198,404 1 Commerical real estate includes owner-occupied balances of $1 billion for December 31, 2019. The amortized cost basis of loans at December 31, 2020 included net deferred costs of $22.6 million on non-PPP portfolio loans and net deferred fees of $9.5 million on PPP loans. At December 31, 2019, the amortized cost basis included net deferred costs of $19.9 million. At December 31, 2020, the remaining fair value adjustments on acquired loans was $30.2 million, or 2.86% of the outstanding acquired loan balances. At December 31, 2019, the remaining fair value adjustments on acquired loans was $34.9 million, or 3.8% of the acquired loan balances. These amounts are accreted into interest income over the remaining lives of the related loans on a level yield basis. Accrued interest receivable is included within Other Assets and was $25.8 million and $14.9 million at December 31, 2020 and December 31, 2019, respectively. Loans to directors and executive officers totaled $1.1 million and $1.7 million at December 31, 2020 and 2019, respectively. No new loans were originated to directors or officers in 2020. The following table presents the status of net loan balances as of December 31, 2020 and December 31, 2019. Loans on short-term payment deferral at the reporting date are reported as current. December 31, 2020 (In thousands) Current Accruing Accruing Accruing Nonaccrual Total Portfolio Loans Construction and land development $ 216,262 $ — $ — $ — $ 158 $ 216,420 Commercial real estate - owner occupied 851,222 1,076 — — 2,471 854,769 Commercial real estate - non-owner occupied 1,041,306 — — — 2,153 1,043,459 Residential real estate 1,142,893 3,002 1,427 61 8,531 1,155,914 Commercial and financial 737,362 135 1,967 — 4,382 743,846 Consumer 180,879 203 138 2 575 181,797 Paycheck Protection Program 515,532 — — — — 515,532 Total Portfolio Loans 4,685,456 4,416 3,532 63 18,270 4,711,737 Acquired Non-PCD Loans Construction and land development 26,250 — — — — 26,250 Commercial real estate - owner occupied 244,486 — — — 2,604 247,090 Commercial real estate - non-owner occupied 322,264 — — — 1,009 323,273 Residential real estate 171,507 1,605 104 — 2,889 176,105 Commercial and financial 93,223 216 — — 1,188 94,627 Consumer 6,640 20 — — — 6,660 Paycheck Protection Program 51,429 — — — — 51,429 Total Acquired Non-PCD Loans 915,799 1,841 104 — 7,690 925,434 PCD Loans Construction and land development 2,429 — — — 9 2,438 Commercial real estate - owner occupied 36,345 — — — 3,106 39,451 Commercial real estate - non-owner occupied 24,200 — — — 4,922 29,122 Residential real estate 9,537 — — — 1,072 10,609 Commercial and financial 15,121 125 — — 1,034 16,280 Consumer 271 — — — 7 278 Total PCD Loans 87,903 125 — — 10,150 98,178 Total Loans $ 5,689,158 $ 6,382 $ 3,636 $ 63 $ 36,110 $ 5,735,349 December 31, 2019 (In thousands) Current Accruing Accruing Accruing Nonaccrual Total 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 Purchased Unimpaired Loans 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 All interest accrued but not received for loans placed on nonaccrual is reversed against interest income. Interest subsequently received on such loans is accounted for under the cost-recovery method, whereby interest income is not recognized until the loan balance is reduced to zero. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current, and future payments are reasonably assured. The Company recognized $0.9 million, $1.3 million, and $0.4 million in interest income on nonaccrual loans during the years ended December 31, 2020, 2019, and 2018, respectively. The following tables present net balances of loans on nonaccrual status and the related allowance for credit losses, if any, as of: December 31, 2020 (In thousands) Nonaccrual Loans With No Related Allowance Nonaccrual Loans With an Allowance Total Nonaccrual Loans Allowance for Credit Losses Construction and land development $ 148 $ 19 $ 167 $ 8 Commercial real estate - owner-occupied 7,893 288 8,181 287 Commercial real estate - non-owner occupied 5,666 2,418 8,084 1,640 Residential real estate 9,520 2,972 12,492 1,587 Commercial and financial 3,175 3,429 6,604 2,235 Consumer 222 360 582 75 Totals $ 26,624 $ 9,486 $ 36,110 $ 5,832 December 31, 2019 (In thousands) Nonaccrual Loans With No Related Allowance Nonaccrual Loans With an Allowance Total Nonaccrual Loans Allowance for Credit Losses Construction and land development $ 4,914 $ 23 $ 4,937 $ 12 Commercial real estate 6,200 320 6,520 149 Residential real estate 8,700 780 9,480 564 Commercial and financial 3,448 2,460 5,908 1,622 Consumer 39 71 110 37 Totals $ 23,301 $ 3,654 $ 26,955 $ 2,384 Collateral-Dependent Loans Loans are considered collateral-dependent when the repayment, based on the Company's assessment as of the reporting date, is expected to be provided substantially through the operation or sale of the underlying collateral and there are no other available and reliable sources of repayment. The following table presents collateral-dependent loans as of: (In thousands) December 31, 2020 December 31, 2019 Construction and land development $ 189 $ 4,926 Commercial real estate - owner-occupied 11,992 2,571 Commercial real estate - non-owner occupied 7,285 3,152 Residential real estate 16,652 11,550 Commercial and financial 11,198 4,338 Consumer 586 141 Totals $ 47,902 $ 26,678 Loans by Risk Rating The Company 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 problem loans 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. • Substandard Impaired: Loans typically placed on nonaccrual and considered to be collateral-dependent or accruing TDRs. • Doubtful: Loans that have all the weaknesses inherent in those classified Substandard with the added characteristic that the weakness present makes 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. The following tables present the risk rating of loans by year of origination as of: December 31, 2020 (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Total Construction and Land Development Risk Ratings: Pass $ 62,107 $ 52,384 $ 46,067 $ 15,873 $ 7,335 $ 17,873 $ 35,324 $ 236,963 Special Mention 206 245 5,918 — — 1,449 — 7,818 Substandard — — — — — 51 — 51 Substandard Impaired — — — 37 — 239 — 276 Doubtful — — — — — — — — Total 62,313 52,629 51,985 15,910 7,335 19,612 35,324 245,108 Commercial real estate - owner occupied Risk Ratings: Pass 155,953 198,559 156,276 138,341 148,389 287,772 14,255 1,099,545 Special Mention 5,773 1,858 3,305 — 4,471 4,050 2 19,459 Substandard — — 4,709 1,955 5,508 — 12,172 Substandard Impaired — 3,151 747 1,362 — 4,874 — 10,134 Doubtful — — — — — — — — Total 161,726 203,568 160,328 144,412 154,815 302,204 14,257 1,141,310 Commercial real estate - non-owner occupied Risk Ratings: Pass 159,299 313,287 201,112 123,357 175,623 356,943 8,596 1,338,217 Special Mention — 431 9,487 7,580 10,240 114 — 27,852 Substandard — — 9,709 — 8,311 3,682 — 21,702 Substandard Impaired — 2,418 — — 125 5,540 — 8,083 Doubtful — — — — — — — — Total 159,299 316,136 220,308 130,937 194,299 366,279 8,596 1,395,854 Residential real estate Risk Ratings: Pass 96,819 144,329 204,077 205,046 160,612 159,742 350,502 1,321,127 Special Mention — — 33 720 — 966 479 2,198 Substandard 350 — — 896 — 1,452 100 2,798 Substandard Impaired 109 726 1,520 1,762 715 9,671 2,002 16,505 Doubtful — — — — — — — — Total 97,278 145,055 205,630 208,424 161,327 171,831 353,083 1,342,628 Commercial and financial Risk Ratings: Pass 214,774 146,511 103,769 60,782 39,692 53,758 204,304 823,590 Special Mention 71 946 965 5,612 67 635 209 8,505 Substandard 154 41 3,016 1,609 553 3,239 764 9,376 Substandard Impaired 317 4,595 3,199 2,292 2,074 704 81 13,262 Doubtful 1 — — — — — — 20 20 Total 215,316 152,093 110,949 70,295 42,386 58,336 205,378 854,753 December 31, 2020 (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Total Consumer Risk Ratings: Pass 46,476 43,143 30,433 18,937 21,880 9,488 15,089 185,446 Special Mention 58 27 14 41 42 21 1,854 2,057 Substandard — — — 42 4 151 228 425 Substandard Impaired 7 50 193 24 329 183 21 807 Doubtful — — — — — — — — Total 46,541 43,220 30,640 19,044 22,255 9,843 17,192 188,735 Paycheck Protection Program Risk Ratings: Pass 566,961 — — — — — — 566,961 Total 566,961 — — — — — — 566,961 Consolidated Risk Ratings: Pass 1,302,389 898,213 741,734 562,336 553,531 885,576 628,070 5,571,849 Special Mention 6,108 3,507 19,722 13,953 14,820 7,235 2,544 67,889 Substandard 504 41 12,725 7,256 10,823 14,083 1,092 46,524 Substandard Impaired 433 10,940 5,659 5,477 3,243 21,211 2,104 49,067 Doubtful 1 — — — — — — 20 20 Total $ 1,309,434 $ 912,701 $ 779,840 $ 589,022 $ 582,417 $ 928,105 $ 633,830 $ 5,735,349 1 Loans classified as doubtful are fully reserved as of December 31, 2020. The following table presents the risk rating of loans as of: December 31, 2019 (In thousands) Pass Special Substandard Doubtful 1 Total 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 Totals $ 5,091,691 $ 51,560 $ 53,958 $ 1,195 $ 5,198,404 1 Loans classified as doubtful are fully reserved as of December 31, 2019. Loans Modified in Connection with COVID-19 Pandemic The CARES Act, which was signed into law on March 27, 2020 and amended by the Consolidated Appropriations Act on December 27, 2020, encourages financial institutions to practice prudent efforts to work with borrowers financially impacted by the COVID-19 pandemic by providing an option to exclude from TDR consideration certain loan modifications that might otherwise be categorized as TDRs under ASC 310-40. This option is available for modifications that are deemed to be COVID-related, where the borrower was not more than 30 days past due on December 31, 2019, and the modification is executed between March 1, 2020 and the earlier of (i) January 1, 2022 or (ii) 60 days after the end of the COVID-19 national emergency. Federal banking regulators issued similar guidance that also allows lenders to conclude that short-term modifications for borrowers affected by the pandemic should not be considered TDRs if the borrower was current at the time of modification. Seacoast provided financially impacted borrowers with loan accommodations, primarily consisting of payment deferrals of up to six months. At its peak, loans on deferral represented $1.1 billion, or 21% of total non-PPP loans. As the year progressed, the large majority of these borrowers successfully resumed making contractual payments, and the level of loans with accommodations dropped to $74.1 million, or 1% of total non-PPP loans, at December 31, 2020. Types of outstanding accommodations at December 31, 2020 included a combination of one or more of the following: full payment deferral, partial payment deferral, reduction of interest rate, extension of the original maturity date, or re-amortization of the facility. The following table presents the balance of loans with active payment accommodations at the specified dates, excluding PPP loans: (In thousands) December 31, 2020 September 30, June 30, Construction and land development $ 1,032 $ 9,359 $ 14,488 Commercial real estate - owner-occupied 14,248 204,710 320,406 Commercial real estate - non-owner occupied 32,549 344,573 445,311 Residential real estate 12,839 75,885 148,035 Commercial and financial 11,915 61,308 130,877 Consumer 1,479 6,815 17,926 Totals $ 74,062 $ 702,650 $ 1,077,043 Troubled Debt Restructured Loans The Company’s 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 restructuring agreements. The following table presents loans that were modified in a troubled debt restructuring during the years ended: (In thousands) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment At December 31, 2020: Construction and land development — $ — $ — Commercial real estate - owner-occupied — — — Commercial real estate - non owner-occupied — — — Residential real estate 2 150 150 Commercial and financial 4 437 437 Consumer 4 112 112 Totals 10 $ 699 $ 699 At December 31, 2019: Construction and land development — $ — $ — Commercial real estate 2 2,166 2,166 Residential real estate 3 1,193 1,193 Commercial and financial 3 1,326 1,326 Consumer 1 19 19 Totals 9 $ 4,704 $ 4,704 At December 31, 2018: Construction and land development — $ — $ — Commercial real estate — — — Residential real estate — — — Commercial and financial 1 98 98 Consumer 3 61 61 Totals 4 $ 159 $ 159 The TDRs described above resulted in a specific allowance for credit losses of $0.2 million as of December 31, 2020, no specific allowance for credit losses as of December 31, 2019, and $0.5 million in specific allowance for credit losses as of December 31, 2018. During the year ended December 31, 2020, there were no defaults on loans that had been modified in TDRs within the preceding twelve months. 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 no defaults on loans modified in TDRs within the preceding 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, is charged off or has been transferred to other real estate owned. For loans measured based on the present value of expected future cash flows, $0.1 million, $0.1 million, and $0.2 million for the years ended December 31, 2020, 2019, and 2018, respectively, was included in interest income and represents the change in present value attributable to the passage of time.

Allowance for Credit Losses

Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Allowance for Credit Losses	Allowance for Credit Losses Activity in the allowance for credit losses is summarized as follows: December 31, 2020 (In thousands) Beginning Impact of Adoption of ASC 326 Initial Allowance on PCD Loans Acquired During the Period Provision for Credit Losses 1 Charge- Recoveries TDR Ending Construction and land development $ 1,842 $ 1,479 $ 87 $ 1,399 $ — $ 114 $ (1) $ 4,920 Commercial real estate - owner occupied 5,361 80 1,161 3,632 (310) 18 (74) 9,868 Commercial real estate - non-owner occupied 7,863 9,341 2,236 18,966 (177) 37 — 38,266 Residential real estate 7,667 5,787 124 3,840 (240) 350 (28) 17,500 Commercial and financial 9,716 3,677 2,643 8,329 (7,091) 1,416 — 18,690 Consumer 2,705 862 28 1,613 (2,024) 316 (11) 3,489 Paycheck Protection Program — — — — — — — — Total $ 35,154 $ 21,226 $ 6,279 $ 37,779 $ (9,842) $ 2,251 $ (114) $ 92,733 1 In addition, the Company recorded a $0.4 million provision to establish a valuation allowance on accrued interest receivable. (In thousands) Beginning Provision Charge- Recoveries TDR Ending 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 Management establishes the allowance using relevant available information from both internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts to project losses over a three-year forecast period. Forecast data is sourced primarily from Moody’s Analytics, a firm widely recognized for its research, analysis, and economic forecasts. For portfolio segments with a weighted average life longer than three years, the Company reverts to longer-term historical loss experience to estimate losses over the remaining life of the loans within each segment. Historical credit losses provide the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level, loan to value ratios, borrower credit characteristics, loan seasoning or term as well as for changes in current and forecasted environmental conditions, such as changes in unemployment rates, property values, occupancy rates, and other macroeconomic metrics. As of December 31, 2020, the Company utilized Moody’s most recent “U.S. Macroeconomic Outlook Baseline” scenario and considered the significant uncertainty associated with the assumptions in the Baseline scenario, including the potential resurgence of virus infections in Florida and other states, and the resulting potential decline in consumer spending and financial implications for businesses. The Company also considered the amount and availability of fiscal stimulus, including programs offered under the CARES Act and other potential future government programs and actions. Outcomes in any or all of these factors could differ from the Baseline scenario, and the Company incorporated qualitative considerations reflecting uncertainty of economic conditions, the possibility that the characteristics of the economic downturn could be sustained over a more extended period, and for additional dimensions of risk not captured in the quantitative model. After the adoption of ASC Topic 326 on January 1, 2020, changes in the allowance for credit losses during the year were largely the result of deterioration in economic conditions due to the COVID-19 pandemic, including higher unemployment and losses of business revenue, and expectations as to the severity and duration of the economic recession. In the Construction and Land Development segment, the increase in reserves during the year was affected by both the outlook for commercial real estate valuations, and qualitative adjustments relating to the uncertainty of economic conditions. In this segment, the primary source of repayment is typically from proceeds of the sale, refinancing, or permanent financing of the underlying property; therefore, industry and collateral type and estimated collateral values are among the relevant factors in assessing expected losses. In the Commercial Real Estate - Owner-Occupied segment, the increase in reserves reflects both the impact of higher loan balances, higher unemployment levels, and lower forecasted commercial real estate valuations. Risk characteristics include but are not limited to, collateral type, loan seasoning, and lien position. In the Commercial Real Estate - Non Owner-Occupied segment, the increase in reserves reflects higher unemployment levels and deterioration in corporate profits over the forecast period. Repayment is often dependent upon rental income from the successful operation of the underlying property. Loan performance may be adversely affected by general economic conditions or conditions specific to the real estate market, including property types. Collateral type, loan seasoning, and lien position are among the risk characteristics analyzed for this segment. The Residential Real Estate segment includes first mortgages secured by residential property, and home equity lines of credit. The increase in reserves reflects higher unemployment, partially offset by lower loan balances and continued strength in the Florida housing market. Risk characteristics considered for this segment include, but are not limited to, collateral type, lien position, loan to value ratios, and loan seasoning. In the Commercial and Financial segment, borrowers are primarily small to medium sized professional firms and other businesses, and loans are generally supported by projected cash flows of the business, collateralized by business assets, and/or guaranteed by the business owners. The increase in reserves reflects an increased proportion of working capital lines compared to loans secured by business assets, higher overall balances, and recessionary conditions. Industry, collateral type, estimated collateral values and loan seasoning are among the relevant factors in assessing expected losses. Consumer loans include installment and revolving lines, loans for automobiles, boats, and other personal or family purposes. Risk characteristics considered for this segment include, but are not limited to, collateral type, loan to value ratios, loan seasoning and FICO score. A decrease in the reserve is attributed to lower loan balances, partially offset by higher unemployment and recessionary conditions. Balances outstanding under the Paycheck Protection Program are guaranteed by the U.S. government and have not been assigned a reserve. The allowance for credit losses is composed of specific allowances for loans individually evaluated and general allowances for loans grouped into loan pools based on similar characteristics, which are collectively evaluated. The Company’s loan portfolio and related allowance at December 31, 2020 and 2019 is shown in the following tables. December 31, 2020 Individually Evaluated Collectively Evaluated Total (In thousands) Recorded Associated Recorded Associated Recorded Associated Construction and land development $ 276 $ 13 $ 244,832 $ 4,907 $ 245,108 $ 4,920 Commercial real estate - owner occupied 10,243 402 1,131,067 9,466 1,141,310 9,868 Commercial real estate - non-owner occupied 8,083 1,640 1,387,771 36,626 1,395,854 38,266 Residential real estate 16,506 2,064 1,326,122 15,436 1,342,628 17,500 Commercial and financial 13,281 3,498 841,472 15,192 854,753 18,690 Consumer 807 91 187,928 3,398 188,735 3,489 Paycheck Protection Program — — 566,961 — 566,961 — Total $ 49,196 $ 7,708 $ 5,686,153 $ 85,025 $ 5,735,349 $ 92,733 December 31, 2019 Individually Evaluated Collectively Evaluated Total (In thousands) Recorded Associated Recorded Associated Recorded Associated Construction and land development $ 5,217 $ 14 $ 319,896 $ 1,828 $ 325,113 $ 1,842 Commercial real estate 20,484 220 2,358,487 13,004 2,378,971 13,224 Residential real estate 16,093 834 1,491,770 6,833 1,507,863 7,667 Commercial and financial 6,631 1,731 771,621 7,985 778,252 9,716 Consumer 337 59 207,868 2,646 208,205 2,705 Total $ 48,762 $ 2,858 $ 5,149,642 $ 32,296 $ 5,198,404 $ 35,154

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives Back-to-Back Swaps The Company offers interest rate swaps when requested by customers to allow them to hedge the risk of rising interest rates on their variable rate loans. Upon entering into these swaps, the Company enters into offsetting positions with counterparties in order to minimize the interest rate risk. These back-to-back swaps qualify as freestanding financial derivatives with the fair values reported in other assets and other liabilities. The Company is party to master netting arrangements with its financial institution counterparties; however, the Company does not offset assets and liabilities under the arrangements for financial statement presentation purposes. Gains and losses on these back-to-back swaps, which offset, are recorded through noninterest income. No net gains or losses have been recognized to date on these instruments. As of December 31, 2020, the interest rate swaps had an aggregate notional value of $182.4 million, with a fair value of $13.3 million recorded in other assets and other liabilities. The weighted average maturity is 7.5 years. Interest Rate Floors Designated as Cash Flow Hedges The Company has entered into interest rate floor contracts to mitigate exposure to the variability of future cash flows due to changes in interest rates on certain segments of its variable-rate loans. During 2020, the Company entered into two interest rate floor contracts, each with a notional amount of $150.0 million, maturing in October 2023 and November 2023. The Company considers these derivatives to be highly effective at achieving offsetting changes in cash flows attributable to changes in interest rates and has designated them as cash flow hedges. Therefore, changes in the fair value of these derivative instruments are recognized in other comprehensive income. Amortization of the premium paid on cash flow hedges is recognized in earnings over the term of the hedge in the same caption as the hedged item. As of December 31, 2020, the interest rate floors have a fair value of $1.0 million and are recorded in other assets in the consolidated balance sheet. Over the next twelve months the Company expects to reclassify $0.2 million from accumulated other comprehensive income into interest income related to these agreements. (In thousands) Notional Amount Fair Value Balance Sheet Category Loss Recognized in OCI Reclassification from AOCI into Income Location December 31, 2020 Back-to-back swaps $ 182,379 $ 13,339 Other Assets and Other Liabilities $ — $ — Noninterest Income Interest rate floors 300,000 1,004 Other Assets (185) 18 Loan Interest Income December 31, 2019 Back-to-back swaps $ 124,606 $ 4,817 Other Assets and Other Liabilities $ — $ — Noninterest Income

Bank Premises and Equipment

Bank Premises and Equipment	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Bank Premises and Equipment	Bank Premises and Equipment Bank premises and equipment consisted of the following: (In thousands) Cost Accumulated Net December 31, 2020 Premises (including land of $22,586) $ 95,852 $ (28,999) $ 66,853 Furniture and equipment 38,375 (30,111) 8,264 Total $ 134,227 $ (59,110) $ 75,117 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

Goodwill and Acquired Intangibl

Goodwill and Acquired Intangible Assets	12 Months Ended
	Dec. 31, 2020
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) 2020 2019 2018 Beginning of year $ 205,286 $ 204,753 $ 147,578 Changes from business combinations 15,890 533 57,175 Total $ 221,176 $ 205,286 $ 204,753 The Company performs an analysis for goodwill impairment on an annual basis in the fourth quarter. Based on the analysis performed, the Company has concluded goodwill was not impaired during the periods presented. 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) 2020 2019 2018 Beginning of year $ 18,305 $ 24,807 $ 18,937 Acquired CDI, including measurement period adjustments 2,129 (676) 10,170 Amortization expense (5,857) (5,826) (4,300) End of year $ 14,577 $ 18,305 $ 24,807 (In months) Remaining average amortization period for CDI 44 47 58 The gross carrying amount and accumulated amortization of the Company's CDI subject to amortization as of: December 31, 2020 December 31, 2019 (In thousands) Gross Accumulated Gross Accumulated Core deposit intangible $ 38,144 $ (23,567) $ 36,015 $ (17,710) 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, 2020 is $4.8 million, $4.3 million, $3.5 million, $0.9 million and $0.5 million, respectively. The carrying value of servicing rights retained from the sale of the guaranteed portion of Small Business Administration (“SBA”) loans totaled $2.2 million and $1.8 million at December 31, 2020 and December 31, 2019, respectively.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2020
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) 2020 2019 2018 Maximum amount outstanding at any month end $ 119,609 $ 193,388 $ 341,213 Weighted average interest rate at end of year 0.16 % 1.17 % 1.14 % Average amount outstanding $ 84,514 $ 106,142 $ 200,839 Weighted average interest rate during the year 0.33 % 1.35 % 0.90 % 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) 2020 2019 2018 Fair value of pledged securities - overnight and continuous: Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities $ 137,268 $ 94,354 $ 246,829 Seacoast Bank had secured lines of credit of $1.8 billion, none of which was outstanding at December 31, 2020. During 2020, the average interest rate on Federal Home Loan Bank (“FHLB”) borrowings was 1.10%. The following table summarizes the Company's junior subordinated debentures and related trust preferred and common equity securities as of December 31, 2020: (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, 2020 SBCF Capital Trust I 3/31/2005 n/a 3/31/2035 $ 20,619 $ 20,000 $ 619 3 month LIBOR +175bps 2.00% SBCF Statutory Trust II 12/16/2005 n/a 12/16/2035 20,619 20,000 619 3 month LIBOR +133bps 1.55% SBCF Statutory Trust III 6/29/2007 n/a 6/15/2037 12,372 12,000 372 3 month LIBOR +135bps 1.57% BANKshares, Inc. Statutory Trust I 12/19/2002 10/1/2014 12/26/2032 5,155 5,000 155 3 month LIBOR +325bps 3.50% BANKshares, Inc. Statutory Trust II 3/17/2004 10/1/2014 3/17/2034 4,124 4,000 124 3 month LIBOR +279bps 3.02% BANKshares, Inc. Capital Trust I 12/15/2005 10/1/2014 12/15/2035 5,155 5,000 155 3 month LIBOR +139bps 1.60% Grand Bank Capital Trust I 10/29/2004 7/17/2015 10/29/2034 7,217 7,000 217 3 month LIBOR +198bps 2.20% $ 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, 2020, 2019 and 2018, 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, 2020
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 $2.8 million in 2020, $2.4 million in 2019, and $2.1 million in 2018. 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 535,000 shares remain available for issuance as of December 31, 2020. The impact of share-based compensation on the Company’s financial results is presented below: For the Year Ended December 31, (In thousands) 2020 2019 2018 Share-based compensation expense $ 7,304 $ 7,244 $ 7,823 Income tax benefit (1,737) (1,723) (1,911) 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, 2020 is presented below: (In thousands) Unrecognized Weighted-Average Period Remaining (Years) Restricted stock awards $ 5,987 2.06 Restricted stock units 3,153 1.93 Stock options 96 0.25 Total $ 9,236 2.00 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, 2020, and changes during the year then ended, is presented below: Restricted Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2020 213,951 $ 26.07 Granted 379,869 18.36 Forfeited/Canceled (11,064) 22.19 Vested (157,602) 23.76 Non-vested at December 31, 2020 425,154 $ 20.03 Information regarding restricted stock awards during each of the following years is presented below: For the Year Ended December 31, 2020 2019 2018 Shares granted 379,869 157,861 242,613 Weighted-average grant date fair value $ 18.36 $ 26.86 $ 26.48 Fair value of awards vested 1 $ 3,745 $ 4,128 $ 2,515 1 Based on grant date fair value, in thousands Restricted Stock Units RSUs granted in 2020 and 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. A summary of the status of the Company’s non-vested RSUs as of December 31, 2020, and changes during the year then ended, is presented below: Restricted Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2020 381,930 $ 23.86 Granted 171,287 17.29 Forfeited/Canceled (12,597) 21.55 Vested (231,023) 19.54 Non-vested at December 31, 2020 309,597 $ 23.54 Information regarding restricted stock units during each of the following years is presented below: For the Year Ended December 31, 2020 2019 2018 Shares granted 171,287 75,002 173,193 Weighted-average grant date fair value $ 17.29 $ 30.02 $ 24.02 Fair value of awards vested 1 $ 2,962 $ 2,864 $ 1,095 1 Based on grant date fair value, in thousands Stock Options The Company issued no stock options in 2020. In 2019 and 2018, the 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 Risk-free interest rates 2.53 % 2.56 % Expected dividend yield — % — % Expected volatility 34.50 % 26.60 % Expected lives (years) 5.0 5.0 A summary of the Company’s stock options as of December 31, 2020, and changes during the year then ended, is presented below: Options Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term (Years) Aggregate Outstanding at January 1, 2020 903,779 $ 22.22 Granted — — Exercised (62,206) 12.31 Forfeited (1,689) 29.30 Outstanding at December 31, 2020 839,884 $ 22.94 5.29 $ 5,822 Exercisable at December 31, 2020 770,615 $ 22.20 5.12 5,822 Information related to stock options during each of the following years: For the Year Ended December 31, 2020 2019 2018 Options granted — 3,438 219,118 Weighted-average grant date fair value $ — $ 28.42 $ 5.65 Intrinsic value of stock options exercised, in thousands 830 277 3,045 The following table summarizes information related to stock options as of December 31, 2020: Range of Exercise Prices Options Remaining Options Weighted $10.54 to $14.82 311,658 3.1 311,658 $ 12.77 $15.99 to $28.69 320,388 6.1 320,388 27.51 $31.15 to $31.15 207,838 7.3 138,569 31.15 Total 839,884 5.3 770,615 $ 22.20 Employee Stock Purchase Plan 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. 2020 2019 2018 ESPP shares purchased 19,713 16,320 15,225 Weighted-average employee purchase price $ 20.68 $ 25.39 $ 26.85

Lease Commitments

Lease Commitments	12 Months Ended
	Dec. 31, 2020
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, 2020 consists of: For the Year Ended December 31, (In thousands) 2020 2019 Operating lease cost $ 5,738 $ 5,570 Variable lease cost 1,325 1,211 Short-term lease cost 497 715 Sublease income (684) (618) Total lease cost $ 6,876 $ 6,878 The following table provides supplemental information related to leases as of and for the year ended December 31, 2020: As of and For the Year Ended December 31, (In thousands, except for weighted average data) 2020 2019 Operating lease right-of-use assets $ 25,538 $ 26,165 Operating lease liabilities 28,959 30,098 Cash paid for amounts included in the measurement of operating lease liabilities 6,035 5,936 Right-of-use assets obtained in exchange for new operating lease obligations 2,095 1,224 Right-of-use assets obtained through bank acquisition 2,343 — Weighted average remaining lease term for operating leases 8.5 years 8.5 years Weighted average discount rate for operating leases 4.62 % 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, 2020 are as follows: For the Year Ended December 31, 2020 (In thousands) 2021 $ 5,865 2022 5,020 2023 3,849 2024 3,855 2025 3,525 Thereafter 12,075 Total undiscounted cash flows 34,189 Less: Net present value adjustment (5,230) Total $ 28,959

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes is as follows: For the Year Ended December 31, (In thousands) 2020 2019 2018 Current Federal $ 21,688 $ 20,954 $ 9,078 State 4,471 1,932 — Deferred Federal (2,697) 2,808 7,018 State (644) 4,179 4,163 $ 22,818 $ 29,873 $ 20,259 The difference between the total expected tax expense (computed by applying the U.S. Federal tax rate of 21% to pretax income and the reported income tax provision relating to income before income taxes is as follows: For the Year Ended December 31, (In thousands) 2020 2019 2018 Tax rate applied to income before income taxes $ 21,122 $ 27,008 $ 18,381 Increase (decrease) resulting from the effects of: Tax law change (375) — — Nondeductible acquisition costs 199 125 207 Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance (1,110) (1,282) (667) State income taxes (804) (1,283) (874) Tax credit investments (72) (72) (33) Stock compensation (111) (698) (918) Other 142 (36) — Federal tax provision 18,991 23,762 16,096 State tax provision 3,827 6,111 4,163 Total income tax provision $ 22,818 $ 29,873 $ 20,259 Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The following is a summary of the significant components of the Company's deferred tax assets and liabilities as of: December 31, (In thousands) 2020 2019 Allowance for credit losses $ 24,158 $ 8,949 Other real estate owned 422 8 Accrued stock compensation 1,973 2,406 Federal tax loss carryforward 2,857 3,601 State tax loss carryforward 1,333 1,110 Alternative minimum tax credit carryforward — 530 Lease liabilities 7,101 7,381 Deferred compensation 2,565 2,458 Accrued interest and fee income 995 3,106 Other 38 378 Gross deferred tax assets 41,442 29,927 Less: Valuation allowance — — Deferred tax assets net of valuation allowance 41,442 29,927 Core deposit base intangible (3,234) (4,005) Net unrealized securities gains (5,890) (1,210) Premises and equipment (534) (114) Right of use assets (6,262) (6,416) Other (1,893) (1,725) Gross deferred tax liabilities (17,813) (13,470) Net deferred tax assets $ 23,629 $ 16,457 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 2020, unrealized gains of $26.3 million resulted in a deferred tax liability of $5.9 million. In 2019, unrealized gains of $5.7 million resulted in a deferred tax liability of $1.2 million. At December 31, 2020, the Company's net deferred tax assets (“DTAs”) of $23.6 million consisted of approximately $18.0 million of net U.S. federal DTAs and $5.6 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 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, 2020 that it is more likely than not that the net DTAs of $23.6 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 $23.6 million in net DTAs well in advance of the statutory carryforward period. At December 31, 2020, approximately $2.9 million of DTAs relate to federal net operating losses which will expire in annual installments beginning in 2029 through 2032. Additionally, $1.3 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, 2020. In accordance with ASC Topic 718, Compensation – Stock Compensation, the Company recognized $0.1 million, $0.8 million and $1.1 million in 2020, 2019, and 2018, 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 investments of $0.9 million, $0.9 million and $1.0 million has been reflected as income tax expense for the years ended December 31, 2020, 2019, and 2018, respectively. The amount of affordable housing tax credits, amortization and tax benefits recorded as income tax expense for the year ended December 31, 2020 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, 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 carrying value of the investments in affordable housing credits is $16.4 million and $7.4 million at December 31, 2020 and 2019, respectively, of which $9.9 million and $0.5 million, respectively, is unfunded. The Company has no unrecognized income tax benefits or provisions due to uncertain income tax positions. No federal or state income tax return examinations are currently in process. The Company does not expect to record or realize any material unrecognized tax benefits during 2021. 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 2017 Florida 2017 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. As a result of the adoption of ASC 326 - Credit Losses on January 1, 2020, the tax impact relating to the incremental allowance for expected credit losses on loans held at amortized cost has been reflected as a credit to retained earnings to reflect the tax impact of increased credit reserves. Accordingly, $5.5 million of such impact has been reflected as an income tax credit and deferred tax asset on the Company's Consolidated Statements of Financial Condition. On March 27, 2020, the CARES Act was enacted, and Section 2303(b) of this act provided the Company with an opportunity to carry back net operating losses arising from 2018, 2019 and 2020 to the prior five tax years. Such NOLs were previously valued at the current federal corporate income tax rate of 21%. However, the provisions of the CARES Act provide for NOL carryback claims to be calculated based on a rate of 35%, which was the federal corporate tax rate in effect for many of the carryback years. Consequently, for the year ended December 31, 2020, the Company filed amended tax returns and has recorded the resulting benefit reflecting taxes recoverable at the 35% tax rate. This resulted in the recognition of an additional $0.4 million income tax benefit on the Company's Consolidated Statements of Income.

Noninterest Income and Expenses

Noninterest Income and Expenses	12 Months Ended
	Dec. 31, 2020
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) 2020 2019 2018 Noninterest Income Service charges on deposit accounts $ 9,429 $ 11,529 $ 11,198 Interchange income 13,711 13,399 12,335 Wealth management income 7,507 6,352 5,915 Mortgage banking fees 14,696 6,490 4,682 Marine finance fees 690 1,054 1,398 SBA gains 685 2,472 2,474 BOLI income 3,561 3,674 4,291 Other income 10,056 10,545 8,352 60,335 55,515 50,645 Securities gains (losses), net 1,235 1,217 (623) Total Noninterest Income $ 61,570 $ 56,732 $ 50,022 Noninterest Expenses Salaries and wages 88,539 73,829 71,111 Employee benefits 15,544 13,697 12,945 Outsourced data processing costs 19,053 15,077 16,374 Telephone and data lines 2,984 2,958 2,481 Occupancy 14,150 14,284 13,394 Furniture and equipment 5,874 6,245 6,744 Marketing 4,833 4,161 5,085 Legal and professional fees 9,167 8,553 9,961 FDIC assessments 1,268 881 2,195 Amortization of intangibles 5,857 5,826 4,300 Foreclosed property expense and net loss on sale 2,263 51 461 Provision for credit losses on unfunded commitments 185 — — Other 15,835 15,177 17,222 Total Noninterest Expenses $ 185,552 $ 160,739 $ 162,273

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2020
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 to risk-weighted assets and of Tier 1 capital to average assets, all as defined in the regulations. At December 31, 2020 and 2019, 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 Minimum for Capital Adequacy Purpose 1 (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Seacoast Banking Corporation of Florida (Consolidated) At December 31, 2020: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 1,029,455 18.51 % n/a n/a $ 444,839 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 970,594 17.46 n/a n/a 333,629 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 899,225 16.17 n/a n/a 250,222 ≥ 4.50 Leverage Ratio (to adjusted average assets) 970,594 11.92 n/a n/a 325,690 ≥ 4.00 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 Seacoast National Bank (A Wholly Owned Bank Subsidiary) At December 31, 2020: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 956,592 17.21 % $ 555,772 ≥ 10.00 % $ 444,617 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 897,731 16.15 444,617 ≥ 8.00 333,463 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 897,727 16.15 361,252 ≥ 6.50 250,097 ≥ 4.50 Leverage Ratio (to adjusted average assets) 897,731 11.03 406,904 ≥ 5.00 325,523 ≥ 4.00 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 1 Excludes the Basel III capital conservation buffer of 2.5%, which if not exceeded may constrain dividends, equity repurchases and compensation. n/a - not applicable Common Stock 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, and issued no shares from treasury stock under this plan during 2020 or 2019.

Seacoast Banking Corporation of

Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information	12 Months Ended
	Dec. 31, 2020
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) 2020 2019 Assets Cash $ 70 $ 70 Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days 70,074 52,979 Investment in subsidiaries 1,134,536 1,005,756 Other assets 659 1,515 $ 1,205,339 $ 1,060,320 Liabilities and Shareholders' Equity Subordinated debt $ 71,365 $ 71,085 Other liabilities 3,676 3,700 Shareholders' equity 1,130,298 985,535 $ 1,205,339 $ 1,060,320 Statements of Income Year Ended December 31, (In thousands) 2020 2019 2018 Income Interest/other $ 270 $ 679 $ 484 Dividends from subsidiary Bank — — — Total income 270 679 484 Interest expense 2,236 3,368 3,165 Other expenses 838 651 879 Total expenses 3,074 4,019 4,044 Loss before income taxes and equity in undistributed income of subsidiaries (2,804) (3,340) (3,560) Income tax benefit (589) (702) (747) Loss before equity in undistributed income of subsidiaries (2,215) (2,638) (2,813) Equity in undistributed income of subsidiaries 79,979 101,377 70,088 Net income $ 77,764 $ 98,739 $ 67,275 Statements of Cash Flows Year Ended December 31, (In thousands) 2020 2019 2018 Cash flows from operating activities Adjustments to reconcile net income to net cash provided Net Income $ 77,764 $ 98,739 $ 67,275 Equity in undistributed income of subsidiaries (79,979) (101,377) (70,088) Net (increase) decrease in other assets 1,772 (738) (10,045) Net increase (decrease) in other liabilities 256 265 (3,431) Net cash used in operating activities (187) (3,111) (16,289) Cash flows from investing activities Net cash paid for bank acquisition (1,462) — (6,558) Investment in unconsolidated subsidiary — (10) — Proceeds from sale of Visa Class B stock — — 21,333 Dividends from bank subsidiary 20,230 18,082 — Increase in securities purchased under agreement to resell, maturing within 30 days, net (17,095) (12,849) (421) Net cash provided by investment activities 1,673 5,223 14,354 Cash flows from financing activities Stock based employment benefit plans (1,486) (2,239) 978 Net cash (used in) provided by financing activities (1,486) (2,239) 978 Net change in cash — (127) (957) Cash at beginning of year 70 197 1,154 Cash at end of year $ 70 $ 70 $ 197 Supplemental disclosure of cash flow information: Cash paid during the period for interest $ 1,992 $ 3,186 $ 2,936

Contingent Liabilities and Comm

Contingent Liabilities and Commitments with Off-Balance Sheet Risk	12 Months Ended
	Dec. 31, 2020
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) 2020 2019 Contract or Notional Amount Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ 1,548,482 $ 1,018,020 Standby letters of credit and financial guarantees written: Secured 11,167 13,073 Unsecured 1,197 663 Unfunded limited partner equity commitment 21,390 6,011 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. Commitments include home equity lines, commercial and consumer lines of credit and construction loans. 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. 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, 2020 and 2019 totaled $12.4 million and $13.2 million, respectively. Unfunded limited partner equity commitments at December 31, 2020 totaled $21.4 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, 2020
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, 2020 and December 31, 2019 included: Fair Value Quoted Prices in Significant Other Significant Other (In thousands) Measurements Level 1 Level 2 Level 3 At December 31, 2020 Financial Assets Available-for-sale debt securities 1 $ 1,398,157 $ 101 $ 1,398,056 $ — Derivative financial instruments 2 14,343 — 14,343 — Loans held for sale 2 68,890 — 68,890 — Loans 3 8,806 — 1,900 6,906 Other real estate owned 4 12,750 — 72 12,678 Equity securities 5 6,530 6,530 — — Financial Liabilities Derivative financial instruments 2 $ 13,339 $ — $ 13,339 $ — At December 31, 2019 Financial Assets 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 — — 1 See “Note D - Securities” for further detail of fair value of individual investment categories. 2 Recurring fair value basis determined using observable market data. 3 See “Note E - Loans”. Nonrecurring fair value adjustments to collateral-dependent loans reflect full or partial write-downs that are based on current appraised values 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. Available-for-sale debt securities: Level 1 securities consist of U.S. Treasury securities. 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. Derivative financial instruments : The Company offers interest rate swaps to certain loan customers to allow them to hedge the risk of rising interest rates on their variable rate loans. The Company originates a variable rate loan and enters into a variable-to-fixed interest rate swap with the customer. The Company also enters into an offsetting swap with a correspondent bank. These back-to-back agreements are intended to offset each other and allow the Company to originate a variable rate loan, while providing a contract for fixed interest payments for the customer. The fair value of these derivatives is based on a discounted cash flow approach. Due to the observable nature of the inputs used in deriving the fair value of these derivative contracts, the valuation of interest rate swaps is classified as Level 2. Other derivatives consist of interest rate floors designated as cash flow hedges. The fair values of these instruments are based upon the estimated amount the Company would receive or pay to terminate the instruments, taking into account current interest rates and, when appropriate, the current credit worthiness of the counterparties. Interest rate floors designated as cash flow hedges are classified within Level 2. 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, 2020 and 2019. The aggregate fair value and contractual balance of loans held for sale as of December 31, 2020 and 2019 is as follows: December 31, (In thousands) 2020 2019 Aggregate fair value $ 68,890 $ 20,029 Contractual balance 66,415 19,445 Excess 2,475 584 Loans : Loans carried at fair value consist of collateral-dependent real estate loans. Fair value is based on recent real estate appraisals less estimated costs of sale. 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, 2020 the range of capitalization rates utilized to determine fair value of the underlying collateral averaged approximately 7.3%. 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 loans is considered level 3 in the fair value hierarchy. Collateral-dependent loans measured at fair value totaled $8.8 million with a specific reserve of $7.7 million at December 31, 2020, compared to $5.1 million with a specific reserve of $2.9 million at December 31, 2019. For loans classified as level 3, the changes included additions of $11.9 million offset by $8.7 million in paydowns and charge-offs during the twelve months ended December 31, 2020. 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. Loans of $4.5 million migrated to OREO during the twelve months ended December 31, 2020 and were classified as level 3. Other changes in 2020 to OREO loans classified as level 3 include sales of $4.9 million and charge-offs of $1.6 million, offset by additions of $2.6 million during the twelve months ended December 31, 2020. 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, 2020 and 2019. 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, 2020 and December 31, 2019 is as follows: Carrying Quoted Prices in Significant Other Significant Other (In thousands) Amount Level 1 Level 2 Level 3 At December 31, 2020 Financial Assets Held-to-maturity debt securities 1 $ 184,484 $ — $ 192,179 $ — Time deposits with other banks 750 — 762 — Loans, net 5,633,810 — — 5,686,019 Financial Liabilities Deposits 6,932,561 — — 6,936,097 Subordinated debt 71,365 — 58,227 — At December 31, 2019 Financial Assets Held-to-maturity debt securities 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 — 1 See “Note D - Securities” 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, 2020 and December 31, 2019: 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, 2020
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 2020, 2019, and 2018, options to purchase 508,000, 491,000, and 483,000 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) 2020 2019 2018 Basic earnings per share Net Income $ 77,764 $ 98,739 $ 67,275 Total weighted average common stock outstanding 53,502 51,449 47,969 Net income per share $ 1.45 $ 1.92 $ 1.40 Diluted earnings per share Net Income $ 77,764 $ 98,739 $ 67,275 Total weighted average common stock outstanding 53,502 51,449 47,969 Add: Dilutive effect of employee restricted stock and stock options (See “Note K - Employee Benefits and Stock Compensation”) 428 580 779 Total weighted average diluted stock outstanding 53,930 52,029 48,748 Net income per share $ 1.44 $ 1.90 $ 1.38

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Business Combinations	Business Combinations Acquisition of Fourth Street Banking Company On August 21, 2020, the Company completed its acquisition of Fourth Street Banking Company (“Fourth Street”). Simultaneously, upon completion of the merger of Fourth Street and the Company, Fourth Street's wholly owned subsidiary bank, Freedom Bank, was merged with and into Seacoast Bank. Prior to the acquisition, Freedom Bank operated two branches in St. Petersburg, Florida. As a result of this acquisition, the Company expects to enhance its presence in St. Petersburg, expand its customer base and leverage operating cost through economies of scale, and positively affect the Company’s operating results. The Company acquired 100% of the outstanding common stock of Fourth Street. Under the terms of the definitive agreement, each share of Fourth Street common stock was converted into the right to receive 0.1275 share of Seacoast common stock. (In thousands, except per share data) August 21, 2020 Number of Fourth Street common shares outstanding 11,220 Shares issued upon conversion of convertible debt 5,405 Per share exchange ratio 0.1275 Number of shares of common stock issued 2,120 Multiplied by common stock price per share on August 21, 2020 $ 19.40 Value of common stock issued 41,121 Cash paid for Fourth Street vested stock options 596 Total purchase price $ 41,717 The acquisition of Fourth Street was accounted for under the acquisition method in accordance with ASC Topic 805, Business Combinations . The Company recognized goodwill of $9.0 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 fair values initially assigned to assets acquired and liabilities assumed are preliminary and could change for up to one year after the closing date of the acquisition as new information and circumstances relative to closing date fair values becomes known. (In thousands) Initially Measured Assets: Cash $ 38,082 Investment securities 3,498 Loans 303,434 Bank premises and equipment 9,480 Core deposit intangibles 1,310 Goodwill 9,030 Other assets 7,088 Total assets $ 371,922 Liabilities: Deposits $ 329,662 Other liabilities 543 Total liabilities $ 330,205 The table below presents information with respect to the fair value and unpaid principal balance of acquired loans at the acquisition date. August 21, 2020 (In thousands) Book Balance Fair Value Construction and land development $ 9,197 $ 8,851 Commercial real estate - owner-occupied 77,936 75,215 Commercial real estate - non owner-occupied 76,014 71,171 Residential real estate 23,548 23,227 Commercial and financial 72,745 68,096 Consumer 2,748 2,694 PPP loans 55,005 54,180 Total acquired loans $ 317,193 $ 303,434 The table below presents the carrying amount of loans for which, at the date of acquisition, there was evidence of more than insignificant deterioration of credit quality since origination: (In thousands) August 21, 2020 Book balance of loans at acquisition $ 59,455 Allowance for credit losses at acquisition (5,763) Non-credit related discount (4,319) Total PCD loans acquired $ 49,373 The Company believes the deposits assumed in 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 Bank of the Palm Beaches On March 13, 2020, the Company completed its acquisition of First Bank of the Palm Beaches (“FBPB”). FBPB was merged with and into Seacoast Bank. FBPB operated two branches in the Palm Beach market. As a result of this acquisition, the Company expects to enhance its presence in the Palm Beach market, expand its customer base and leverage operating cost through economies of scale, and positively affect the Company’s operating results. The Company acquired 100% of the outstanding common stock of FBPB. Under the terms of the definitive agreement, each share of FBPB common stock was converted into the right to receive 0.2000 share of Seacoast common stock. (In thousands, except per share data) March 13, 2020 Number of FBPB common shares outstanding 5,213 Per share exchange ratio 0.2000 Number of shares of common stock issued 1,043 Multiplied by common stock price per share on March 13, 2020 $ 20.17 Value of common stock issued 21,031 Cash paid for FBPB vested stock options 866 Total purchase price $ 21,897 The acquisition of FBPB was accounted for under the acquisition method in accordance with ASC Topic 805, Business Combinations . The Company recognized goodwill of $6.9 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 fair values initially assigned to assets acquired and liabilities assumed are preliminary and could change for up to one year after the closing date of the acquisition as new information and circumstances relative to closing date fair values becomes known. (In thousands) Initially Measured Measurement Period Adjustments As Adjusted March 13, 2020 Assets: Cash $ 34,749 $ — $ 34,749 Investment securities 447 — 447 Loans 146,839 (62) 146,777 Bank premises and equipment 6,086 — 6,086 Core deposit intangibles 819 — 819 Goodwill 6,799 62 6,861 Other assets 1,285 20 1,305 Total assets $ 197,024 $ 20 $ 197,044 Liabilities: Deposits $ 173,741 $ — $ 173,741 Other liabilities 1,386 20 1,406 Total liabilities $ 175,127 $ 20 $ 175,147 The table below presents information with respect to the fair value and unpaid principal balance of acquired loans at the acquisition date. March 13, 2020 (In thousands) Book Balance Fair Value Construction and land development $ 9,493 $ 9,012 Commercial real estate - owner-occupied 46,221 45,171 Commercial real estate - non owner-occupied 36,268 35,079 Residential real estate 47,569 47,043 Commercial and financial 9,659 9,388 Consumer 1,132 1,084 Total acquired loans $ 150,342 $ 146,777 The table below presents the carrying amount of loans for which, at the date of acquisition, there was evidence of more than insignificant deterioration of credit quality since origination: (In thousands) March 13, 2020 Book balance of loans at acquisition $ 43,682 Allowance for credit losses at acquisition (516) Non-credit related discount (128) Total PCD loans acquired $ 43,038 The Company believes the deposits assumed in 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 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, the Company accounted for these loans pursuant to ASC Topic 310-30 at the time of acquisition and until the adoption of ASC Topic 326 on January 1, 2020. 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 were 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. 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, 2020, 2019 and 2018 are $9.1 million, $1.0 million, and $9.7 million, respectively. Pro-Forma Information Pro-forma data as of 2020 and 2019 present information as if the acquisitions of FBPB and Fourth Street occurred at the beginning of 2019: Twelve Months Ended (In thousands, except per share data) 2020 2019 Net interest income 1 $ 274,432 $ 266,033 Net income available to common shareholders 82,179 100,718 EPS - basic $ 1.60 $ 1.88 EPS - diluted $ 1.59 $ 1.86 1 Provisions for credit losses of $1.8 million for FBPB and $4.6 million for Freedom Bank, recorded under CECL at the dates of acquisition, have been excluded from the pro forma information above, which presents information as if the acquisitions had occurred on January 1, 2019, prior to the Company's adoption of CECL.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
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 and a network of traditional branch offices and 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.
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 credit losses, acquisition accounting and purchased loans, intangible assets and impairment testing, other fair value measurements, and contingent liabilities.
Recently Adopted Accounting Standards and Not Yet Adopted	Recently Adopted Accounting Pronouncements: On January 1, 2020, the Company adopted ASC Topic 326 - Financial Instruments - Credit Losses, which replaced the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss (“CECL”) methodology. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including loan receivables and held-to-maturity (“HTM”) debt securities. It also applies to off-balance sheet credit exposure such as loan commitments, standby letters of credit, financial guarantees and other similar instruments. In addition, ASC Topic 326 changed the accounting for impairment of available-for-sale (“AFS”) debt securities. The Company adopted ASC Topic 326 using the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. Results for the reporting period beginning after January 1, 2020 are presented under ASC Topic 326, while prior amounts continue to be reported in accordance with previously applicable GAAP. The following table reflects the cumulative effect of adoption: (in thousands) December 31, 2019 CECL adoption impact January 1, 2020 Loans $ 5,198,404 $ (706) $ 5,197,698 Allowance for credit losses 35,154 21,226 56,380 Reserve for unfunded commitments 140 1,837 1,977 Deferred tax assets 16,457 (5,481) 10,976 Retained earnings 195,813 (16,876) 178,937 ASC Topic 326 introduced new definitions and criteria for categorizing purchased loans. Loans that, as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination are classified as purchased credit deteriorated (“PCD”). Acquired loans which do not meet the definition of PCD are classified by the Company as acquired Non-PCD. At the date of adoption, the Company reclassified all loans previously classified as purchased credit impaired (“PCI”) to PCD, and increased the allowance $0.7 million with a corresponding adjustment to these loans' amortized cost basis. The remaining noncredit discount on loans previously classified as PCI was $0.9 million, which will be accreted into interest income over the remaining life of the loans. Under CECL, the Company estimates the allowance using relevant available information, from both internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Historical credit losses provide the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level, loan to value ratios, borrower credit characteristics, loan seasoning or term as well as for changes in environmental conditions, such as changes in unemployment rates, property values, occupancy rates, and other macroeconomic metrics. For loans analyzed on a collective basis, the Company has developed an allowance model based on an analysis of the probability of default (“PD”) and loss given default (“LGD”) to determine an expected loss by loan segment. PDs and LGDs are developed by analyzing the average historical loss migration of loans to default. The Company excludes accrued interest on loans from its determination of allowance. The allowance estimation process also applies an economic forecast scenario over a three year forecast period. The forecast may utilize one scenario or a composite of scenarios based on management's judgment and expectations around the current and future macroeconomic outlook. Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term of a loan excludes expected extensions, renewals, and modification unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower or the extension or renewal options are included in the original or modified contract at the reporting date and not unconditionally cancellable by the Company. 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. Adjustments may be made to baseline reserves for some of the loan pools based on an assessment of internal and external influences on credit quality not fully reflected in the quantitative components of the allowance model. These influences may include elements such as changes in concentration, macroeconomic conditions, recent observable asset quality trends, staff turnover, regional market conditions, employment levels and loan growth. Based upon management's assessments of these factors, the Company may apply qualitative adjustments to the allowance. Loans that do not share risk characteristics are evaluated on an individual basis. Loans evaluated individually are not also included in the collective evaluation. When management determines that foreclosure is probable, expected credit losses are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate. All HTM debt securities are issued by government-sponsored entities, which are either explicitly or implicitly guaranteed by the U.S. government and have a long history of no credit losses. In addition, the credit rating on all the Company's HTM debt securities as of the date of adoption is AA+. There is no history of the government withholding or limiting support to these agencies, nor is there any indication of a change to that historical support. While the potential for default on these securities may be something greater than zero, the long history with no credit losses, the implied government guarantee of principal and interest payments and the high credit rating of the HTM portfolio provide sufficient basis for the current expectation that there is zero risk of loss if default were to occur. As a result, the Company recorded no allowance for HTM debt securities with fair value less than amortized cost basis at the date of adoption. ASC Topic 326 amended the existing other-than-temporary-impairment guidance for AFS securities, requiring credit losses to be recorded as an allowance rather than through a permanent write-down. When evaluating AFS debt securities under ASC Topic 326, the Company has evaluated whether the decline in fair value is attributed to credit losses or other factors using both quantitative and qualitative analyses, including cash flow analysis, review of credit ratings, remaining payment terms, prepayment speeds and analysis of macro-economic conditions. At the date of adoption, collateralized loan obligations had unrealized losses of $1.2 million. The collateral for these securities is first lien senior secured corporate debt, and the Company holds senior tranches rated A or higher. Based on this analysis, the Company believes that the unrealized loss position for AFS debt securities at the time of adoption was the result of both broad investment type spreads and the current rate environment. Each investment is expected to recover its price depreciation over its holding period as it moves to maturity and the Company has the intent and ability to hold these securities to maturity if necessary. As a result of this evaluation, the Company concluded that no allowance was appropriate at the date of adoption.
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 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.
Loans Held for Sale	Loans Held for Sale: The Company has elected to account for residential mortgage loans originated as held for sale at fair value. Changes in fair value are measured and recorded in Mortgage Banking Fees in noninterest income each period. The Company designates other loans as held for sale when it has the intent to sell them. Such loans are transferred to held for sale at the lower of cost or estimated fair value less cost to sell. At the time of transfer, write-downs on the loans are recorded as charge-offs, establishing a new cost basis upon transfer.
Loans Held for Investment	Loans Held for Investment: 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 that 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 credit losses. Loans that, as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination are classified as purchased credit deteriorated (“PCD”). Acquired loans that do not meet the definition of PCD are classified by the Company as acquired Non-PCD. An allowance for expected credit losses on PCD loans is recorded at the date of acquisition through an adjustment to the loans' amortized cost basis. In contrast, expected credit losses on loans not considered PCD are recognized through the provision for credit losses in net income at the date of acquisition. 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. In response to the COVID-19 pandemic beginning in early 2020, rules defined in the Coronavirus Aid, Relief and Economic Security (“CARES”) Act and a joint statement issued by federal regulators in consultation with FASB provide financial institutions with the option not to apply troubled debt restructure (“TDR”) accounting to eligible loan modifications provided to borrowers affected by the economic impact of the COVID-19 pandemic. Outside of this guidance, a loan for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulty, is considered to be a TDR. The allowance for credit losses on a TDR is measured using the same method as all other loans held for investment, except when the value of a concession cannot be measured using a method other than the discounted cash flow method. When the value of a concession is measured using the discounted cash flow method, the allowance for credit losses is determined by discounting the expected future cash flows at the original interest rate of the loan. It is the Company's practice to ensure that the charge-off policy meets or exceeds regulatory minimums. Losses on unsecured consumer loans are recognized at 90 days past due, compared to the regulatory loss criteria of 120 days. In compliance with Federal Financial Institution Examination Council guidelines, secured consumer loans, including residential real estate, are typically charged-off or charged down between 120 and 180 days past due, depending on the collateral type. Commercial loans and real estate loans are typically placed on nonaccrual status when principal or interest is past due for 90 days or more, unless the loan is both secured by collateral having realizable value sufficient to discharge the debt in-full and the loan is in process of collection. Secured loans may be charged-down to the estimated value of the collateral with previously accrued unpaid interest reversed against interest income. Subsequent charge-offs may be required as a result of changes in the market value of collateral or other repayment prospects. Initial charge-off amounts are based on valuation estimates derived from appraisals, broker price opinions, or other market information. Generally, new appraisals are not received until the foreclosure process is completed; however, collateral values are evaluated periodically based on market information and incremental charge-offs are recorded if it is determined that collateral values have declined from their initial estimates.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities : The Company enters into derivative contracts, including swaps and floors, to meet the needs of customers who request such services and to manage the Company's exposure to interest rate fluctuations. Derivative contracts are carried at fair value and recorded in the consolidated balance sheet within other assets or other liabilities. The gain or loss resulting from changes in the fair value of interest rate swaps designated and qualifying as cash flow hedging instruments is initially reported as a component of other comprehensive income and subsequently reclassified into earnings through interest income in the same period in which the hedged transaction affects earnings. The Company discontinues hedge accounting prospectively when it is determined that the derivative contract is no longer effective in offsetting changes in the cash flows of the hedged item, the derivative expires or is terminated, management determines that the designation of the derivative as a hedging instrument is no longer appropriate or, for a cash flow hedge, the occurrence of the forecasted transaction is no longer probable. When hedge accounting on a cash flow hedge is discontinued, any subsequent changes in fair value of the derivative are recognized in earnings. The cumulative unrealized gain or loss related to a discontinuing cash flow hedge continues to be reported in AOCI and is subsequently reclassified into earnings in the same period in which the hedged transactions affects earnings, unless it is probable that the forecasted transaction will not occur by the end of the originally specified time period, in which case the cumulative unrealized gain or loss in AOCI is reclassified into earnings immediately. Cash flows resulting from derivative financial instruments that are accounted for as hedges are classified in the cash flow statement in the same category as the cash flows from the hedged items. See additional disclosures related to derivative instruments and hedging activities in “Note G – Derivatives”.
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. The Company estimates a reserve for potential losses on unfunded commitments, which is reported separately from the allowance for credit losses within other liabilities. The reserve is based upon the same quantitative and qualitative factors applied to the collectively evaluated loan portfolio.
Fair Value Measurements	Fair Value Measurements: The Company measures or monitors the fair value of many of its assets and liabilities. 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 collateral-dependent loans, OREO, loan 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.
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
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 credit 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 maintain the facility are expensed.
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
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.
Leases	Leases: Arrangements are analyzed at inception to determine the existence of a lease. Right-of-use assets (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.
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). • Wealth Management Income: 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. The Company also 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.
Treasury Stock	Treasury Stock: The Company's repurchase of shares of its common stock are recorded at cost as treasury stock and result in a reduction of shareholders' equity. Activity in treasury stock represents shares traded to offset employee payroll taxes on vested shares. Shares held in treasury are used for employee share purchases through the Company's stock purchase plan.
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 5 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 three 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.
Income Taxes	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	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

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Schedule of Cumulative Effect of Adoption	The following table reflects the cumulative effect of adoption: (in thousands) December 31, 2019 CECL adoption impact January 1, 2020 Loans $ 5,198,404 $ (706) $ 5,197,698 Allowance for credit losses 35,154 21,226 56,380 Reserve for unfunded commitments 140 1,837 1,977 Deferred tax assets 16,457 (5,481) 10,976 Retained earnings 195,813 (16,876) 178,937

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2020
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 available-for-sale and held-to-maturity securities at December 31, 2020 and December 31, 2019 are summarized as follows: December 31, 2020 (In thousands) Amortized Gross Gross Fair Available-for-Sale Debt Securities U.S. Treasury securities and obligations of U.S. government agencies $ 8,250 $ 528 $ (1) $ 8,777 Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 1,038,437 23,457 (1,240) 1,060,654 Private mortgage-backed securities and collateralized mortgage obligations 89,284 2,131 (210) 91,205 Collateralized loan obligations 202,563 279 (647) 202,195 Obligations of state and political subdivisions 33,005 2,321 — 35,326 Totals $ 1,371,539 $ 28,716 $ (2,098) $ 1,398,157 Held-to-Maturity Debt Securities Mortgage-backed securities of U.S. government-sponsored entities $ 184,484 $ 7,818 $ (123) $ 192,179 Totals $ 184,484 $ 7,818 $ (123) $ 192,179 December 31, 2019 (In thousands) Amortized Gross Gross Fair Available-for-Sale Debt Securities 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 Held-to-Maturity Debt Securities 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
Summary of Amortized Cost and Fair Value of Securities Held to Maturity	The amortized cost, gross unrealized gains and losses and fair value of available-for-sale and held-to-maturity securities at December 31, 2020 and December 31, 2019 are summarized as follows: December 31, 2020 (In thousands) Amortized Gross Gross Fair Available-for-Sale Debt Securities U.S. Treasury securities and obligations of U.S. government agencies $ 8,250 $ 528 $ (1) $ 8,777 Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 1,038,437 23,457 (1,240) 1,060,654 Private mortgage-backed securities and collateralized mortgage obligations 89,284 2,131 (210) 91,205 Collateralized loan obligations 202,563 279 (647) 202,195 Obligations of state and political subdivisions 33,005 2,321 — 35,326 Totals $ 1,371,539 $ 28,716 $ (2,098) $ 1,398,157 Held-to-Maturity Debt Securities Mortgage-backed securities of U.S. government-sponsored entities $ 184,484 $ 7,818 $ (123) $ 192,179 Totals $ 184,484 $ 7,818 $ (123) $ 192,179 December 31, 2019 (In thousands) Amortized Gross Gross Fair Available-for-Sale Debt Securities 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 Held-to-Maturity Debt Securities 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
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 Fair Amortized Fair Due in less than one year $ — $ — $ 35 $ 35 Due after one year through five years — — 11,305 11,929 Due after five years through ten years — — 8,590 9,323 Due after ten years — — 21,325 22,816 — — 41,255 44,103 Mortgage-backed securities of U.S. government-sponsored entities 184,484 192,179 1,038,437 1,060,654 Private mortgage-backed securities and collateralized mortgage obligations — — 89,284 91,205 Collateralized loan obligations — — 202,563 202,195 Totals $ 184,484 $ 192,179 $ 1,371,539 $ 1,398,157
Schedule of Unrealized Loss and Fair Value on Investments	The tables below indicate, at December 31, 2020, the fair value of available-for-sale debt securities with unrealized losses for which no allowance for credit losses has been recorded, and at December 31, 2019, the fair value of available-for-sale and held-to-maturity debt securities with unrealized losses for which no allowance has been recorded. December 31, 2020 Less than 12 months 12 months or longer Total (In thousands) Fair Unrealized Fair Unrealized Fair Unrealized U.S. Treasury securities and obligations of U.S. government agencies $ — $ — $ 256 $ (1) $ 256 $ (1) Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 203,405 (1,218) 569 (22) 203,974 (1,240) Private mortgage-backed securities and collateralized mortgage obligations 23,997 (210) — — 23,997 (210) Collateralized loan obligations 104,697 (102) 72,513 (545) 177,210 (647) Totals $ 332,099 $ (1,530) $ 73,338 $ (568) $ 405,437 $ (2,098) December 31, 2019 Less than 12 months 12 months or longer Total (In thousands) Fair Unrealized Fair Unrealized Fair Unrealized 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) Totals $ 312,988 $ (2,041) $ 214,951 $ (2,506) $ 527,939 $ (4,547)

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans	The following tables present net loan balances by segment as of: December 31, 2020 (In thousands) Portfolio Loans Acquired Non-PCD Loans PCD Loans Total Construction and land development $ 216,420 $ 26,250 $ 2,438 $ 245,108 Commercial real estate - owner occupied 854,769 247,090 39,451 1,141,310 Commercial real estate - non-owner occupied 1,043,459 323,273 29,122 1,395,854 Residential real estate 1,155,914 176,105 10,609 1,342,628 Commercial and financial 743,846 94,627 16,280 854,753 Consumer 181,797 6,660 278 188,735 Paycheck Protection Program 515,532 51,429 — 566,961 Totals $ 4,711,737 $ 925,434 $ 98,178 $ 5,735,349 December 31, 2019 (In thousands) Portfolio Loans PULs PCI Loans Total Construction and land development $ 281,335 $ 43,618 $ 160 $ 325,113 Commercial real estate 1 1,834,811 533,943 10,217 2,378,971 Residential real estate 1,304,305 201,848 1,710 1,507,863 Commercial and financial 697,301 80,372 579 778,252 Consumer 200,166 8,039 — 208,205 Totals $ 4,317,918 $ 867,820 $ 12,666 $ 5,198,404 1 Commerical real estate includes owner-occupied balances of $1 billion for December 31, 2019.
Schedule of Past Due Financing Receivables	The following table presents the status of net loan balances as of December 31, 2020 and December 31, 2019. Loans on short-term payment deferral at the reporting date are reported as current. December 31, 2020 (In thousands) Current Accruing Accruing Accruing Nonaccrual Total Portfolio Loans Construction and land development $ 216,262 $ — $ — $ — $ 158 $ 216,420 Commercial real estate - owner occupied 851,222 1,076 — — 2,471 854,769 Commercial real estate - non-owner occupied 1,041,306 — — — 2,153 1,043,459 Residential real estate 1,142,893 3,002 1,427 61 8,531 1,155,914 Commercial and financial 737,362 135 1,967 — 4,382 743,846 Consumer 180,879 203 138 2 575 181,797 Paycheck Protection Program 515,532 — — — — 515,532 Total Portfolio Loans 4,685,456 4,416 3,532 63 18,270 4,711,737 Acquired Non-PCD Loans Construction and land development 26,250 — — — — 26,250 Commercial real estate - owner occupied 244,486 — — — 2,604 247,090 Commercial real estate - non-owner occupied 322,264 — — — 1,009 323,273 Residential real estate 171,507 1,605 104 — 2,889 176,105 Commercial and financial 93,223 216 — — 1,188 94,627 Consumer 6,640 20 — — — 6,660 Paycheck Protection Program 51,429 — — — — 51,429 Total Acquired Non-PCD Loans 915,799 1,841 104 — 7,690 925,434 PCD Loans Construction and land development 2,429 — — — 9 2,438 Commercial real estate - owner occupied 36,345 — — — 3,106 39,451 Commercial real estate - non-owner occupied 24,200 — — — 4,922 29,122 Residential real estate 9,537 — — — 1,072 10,609 Commercial and financial 15,121 125 — — 1,034 16,280 Consumer 271 — — — 7 278 Total PCD Loans 87,903 125 — — 10,150 98,178 Total Loans $ 5,689,158 $ 6,382 $ 3,636 $ 63 $ 36,110 $ 5,735,349 December 31, 2019 (In thousands) Current Accruing Accruing Accruing Nonaccrual Total 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 Purchased Unimpaired Loans 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
Schedule of Nonaccrual Loans by Loan Category	The following tables present net balances of loans on nonaccrual status and the related allowance for credit losses, if any, as of: December 31, 2020 (In thousands) Nonaccrual Loans With No Related Allowance Nonaccrual Loans With an Allowance Total Nonaccrual Loans Allowance for Credit Losses Construction and land development $ 148 $ 19 $ 167 $ 8 Commercial real estate - owner-occupied 7,893 288 8,181 287 Commercial real estate - non-owner occupied 5,666 2,418 8,084 1,640 Residential real estate 9,520 2,972 12,492 1,587 Commercial and financial 3,175 3,429 6,604 2,235 Consumer 222 360 582 75 Totals $ 26,624 $ 9,486 $ 36,110 $ 5,832 December 31, 2019 (In thousands) Nonaccrual Loans With No Related Allowance Nonaccrual Loans With an Allowance Total Nonaccrual Loans Allowance for Credit Losses Construction and land development $ 4,914 $ 23 $ 4,937 $ 12 Commercial real estate 6,200 320 6,520 149 Residential real estate 8,700 780 9,480 564 Commercial and financial 3,448 2,460 5,908 1,622 Consumer 39 71 110 37 Totals $ 23,301 $ 3,654 $ 26,955 $ 2,384
Schedule of Collateral Dependent Loans	The following table presents collateral-dependent loans as of: (In thousands) December 31, 2020 December 31, 2019 Construction and land development $ 189 $ 4,926 Commercial real estate - owner-occupied 11,992 2,571 Commercial real estate - non-owner occupied 7,285 3,152 Residential real estate 16,652 11,550 Commercial and financial 11,198 4,338 Consumer 586 141 Totals $ 47,902 $ 26,678 December 31, (In thousands) 2020 2019 2018 Fair value of pledged securities - overnight and continuous: Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities $ 137,268 $ 94,354 $ 246,829
Schedule of Risk Categories of Loans by Class of Loans	The following tables present the risk rating of loans by year of origination as of: December 31, 2020 (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Total Construction and Land Development Risk Ratings: Pass $ 62,107 $ 52,384 $ 46,067 $ 15,873 $ 7,335 $ 17,873 $ 35,324 $ 236,963 Special Mention 206 245 5,918 — — 1,449 — 7,818 Substandard — — — — — 51 — 51 Substandard Impaired — — — 37 — 239 — 276 Doubtful — — — — — — — — Total 62,313 52,629 51,985 15,910 7,335 19,612 35,324 245,108 Commercial real estate - owner occupied Risk Ratings: Pass 155,953 198,559 156,276 138,341 148,389 287,772 14,255 1,099,545 Special Mention 5,773 1,858 3,305 — 4,471 4,050 2 19,459 Substandard — — 4,709 1,955 5,508 — 12,172 Substandard Impaired — 3,151 747 1,362 — 4,874 — 10,134 Doubtful — — — — — — — — Total 161,726 203,568 160,328 144,412 154,815 302,204 14,257 1,141,310 Commercial real estate - non-owner occupied Risk Ratings: Pass 159,299 313,287 201,112 123,357 175,623 356,943 8,596 1,338,217 Special Mention — 431 9,487 7,580 10,240 114 — 27,852 Substandard — — 9,709 — 8,311 3,682 — 21,702 Substandard Impaired — 2,418 — — 125 5,540 — 8,083 Doubtful — — — — — — — — Total 159,299 316,136 220,308 130,937 194,299 366,279 8,596 1,395,854 Residential real estate Risk Ratings: Pass 96,819 144,329 204,077 205,046 160,612 159,742 350,502 1,321,127 Special Mention — — 33 720 — 966 479 2,198 Substandard 350 — — 896 — 1,452 100 2,798 Substandard Impaired 109 726 1,520 1,762 715 9,671 2,002 16,505 Doubtful — — — — — — — — Total 97,278 145,055 205,630 208,424 161,327 171,831 353,083 1,342,628 Commercial and financial Risk Ratings: Pass 214,774 146,511 103,769 60,782 39,692 53,758 204,304 823,590 Special Mention 71 946 965 5,612 67 635 209 8,505 Substandard 154 41 3,016 1,609 553 3,239 764 9,376 Substandard Impaired 317 4,595 3,199 2,292 2,074 704 81 13,262 Doubtful 1 — — — — — — 20 20 Total 215,316 152,093 110,949 70,295 42,386 58,336 205,378 854,753 December 31, 2020 (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Total Consumer Risk Ratings: Pass 46,476 43,143 30,433 18,937 21,880 9,488 15,089 185,446 Special Mention 58 27 14 41 42 21 1,854 2,057 Substandard — — — 42 4 151 228 425 Substandard Impaired 7 50 193 24 329 183 21 807 Doubtful — — — — — — — — Total 46,541 43,220 30,640 19,044 22,255 9,843 17,192 188,735 Paycheck Protection Program Risk Ratings: Pass 566,961 — — — — — — 566,961 Total 566,961 — — — — — — 566,961 Consolidated Risk Ratings: Pass 1,302,389 898,213 741,734 562,336 553,531 885,576 628,070 5,571,849 Special Mention 6,108 3,507 19,722 13,953 14,820 7,235 2,544 67,889 Substandard 504 41 12,725 7,256 10,823 14,083 1,092 46,524 Substandard Impaired 433 10,940 5,659 5,477 3,243 21,211 2,104 49,067 Doubtful 1 — — — — — — 20 20 Total $ 1,309,434 $ 912,701 $ 779,840 $ 589,022 $ 582,417 $ 928,105 $ 633,830 $ 5,735,349 1 Loans classified as doubtful are fully reserved as of December 31, 2020. The following table presents the risk rating of loans as of: December 31, 2019 (In thousands) Pass Special Substandard Doubtful 1 Total 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 Totals $ 5,091,691 $ 51,560 $ 53,958 $ 1,195 $ 5,198,404 1 Loans classified as doubtful are fully reserved as of December 31, 2019.
Schedule of Loans Modified	The following table presents the balance of loans with active payment accommodations at the specified dates, excluding PPP loans: (In thousands) December 31, 2020 September 30, June 30, Construction and land development $ 1,032 $ 9,359 $ 14,488 Commercial real estate - owner-occupied 14,248 204,710 320,406 Commercial real estate - non-owner occupied 32,549 344,573 445,311 Residential real estate 12,839 75,885 148,035 Commercial and financial 11,915 61,308 130,877 Consumer 1,479 6,815 17,926 Totals $ 74,062 $ 702,650 $ 1,077,043
Schedule of Troubled Debt Restructuring	The following table presents loans that were modified in a troubled debt restructuring during the years ended: (In thousands) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment At December 31, 2020: Construction and land development — $ — $ — Commercial real estate - owner-occupied — — — Commercial real estate - non owner-occupied — — — Residential real estate 2 150 150 Commercial and financial 4 437 437 Consumer 4 112 112 Totals 10 $ 699 $ 699 At December 31, 2019: Construction and land development — $ — $ — Commercial real estate 2 2,166 2,166 Residential real estate 3 1,193 1,193 Commercial and financial 3 1,326 1,326 Consumer 1 19 19 Totals 9 $ 4,704 $ 4,704 At December 31, 2018: Construction and land development — $ — $ — Commercial real estate — — — Residential real estate — — — Commercial and financial 1 98 98 Consumer 3 61 61 Totals 4 $ 159 $ 159

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Allowance for Credit Losses on Financing Receivables	Activity in the allowance for credit losses is summarized as follows: December 31, 2020 (In thousands) Beginning Impact of Adoption of ASC 326 Initial Allowance on PCD Loans Acquired During the Period Provision for Credit Losses 1 Charge- Recoveries TDR Ending Construction and land development $ 1,842 $ 1,479 $ 87 $ 1,399 $ — $ 114 $ (1) $ 4,920 Commercial real estate - owner occupied 5,361 80 1,161 3,632 (310) 18 (74) 9,868 Commercial real estate - non-owner occupied 7,863 9,341 2,236 18,966 (177) 37 — 38,266 Residential real estate 7,667 5,787 124 3,840 (240) 350 (28) 17,500 Commercial and financial 9,716 3,677 2,643 8,329 (7,091) 1,416 — 18,690 Consumer 2,705 862 28 1,613 (2,024) 316 (11) 3,489 Paycheck Protection Program — — — — — — — — Total $ 35,154 $ 21,226 $ 6,279 $ 37,779 $ (9,842) $ 2,251 $ (114) $ 92,733 1 In addition, the Company recorded a $0.4 million provision to establish a valuation allowance on accrued interest receivable. (In thousands) Beginning Provision Charge- Recoveries TDR Ending 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
Loan Portfolio and Related Allowance	The Company’s loan portfolio and related allowance at December 31, 2020 and 2019 is shown in the following tables. December 31, 2020 Individually Evaluated Collectively Evaluated Total (In thousands) Recorded Associated Recorded Associated Recorded Associated Construction and land development $ 276 $ 13 $ 244,832 $ 4,907 $ 245,108 $ 4,920 Commercial real estate - owner occupied 10,243 402 1,131,067 9,466 1,141,310 9,868 Commercial real estate - non-owner occupied 8,083 1,640 1,387,771 36,626 1,395,854 38,266 Residential real estate 16,506 2,064 1,326,122 15,436 1,342,628 17,500 Commercial and financial 13,281 3,498 841,472 15,192 854,753 18,690 Consumer 807 91 187,928 3,398 188,735 3,489 Paycheck Protection Program — — 566,961 — 566,961 — Total $ 49,196 $ 7,708 $ 5,686,153 $ 85,025 $ 5,735,349 $ 92,733 December 31, 2019 Individually Evaluated Collectively Evaluated Total (In thousands) Recorded Associated Recorded Associated Recorded Associated Construction and land development $ 5,217 $ 14 $ 319,896 $ 1,828 $ 325,113 $ 1,842 Commercial real estate 20,484 220 2,358,487 13,004 2,378,971 13,224 Residential real estate 16,093 834 1,491,770 6,833 1,507,863 7,667 Commercial and financial 6,631 1,731 771,621 7,985 778,252 9,716 Consumer 337 59 207,868 2,646 208,205 2,705 Total $ 48,762 $ 2,858 $ 5,149,642 $ 32,296 $ 5,198,404 $ 35,154

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	(In thousands) Notional Amount Fair Value Balance Sheet Category Loss Recognized in OCI Reclassification from AOCI into Income Location December 31, 2020 Back-to-back swaps $ 182,379 $ 13,339 Other Assets and Other Liabilities $ — $ — Noninterest Income Interest rate floors 300,000 1,004 Other Assets (185) 18 Loan Interest Income December 31, 2019 Back-to-back swaps $ 124,606 $ 4,817 Other Assets and Other Liabilities $ — $ — Noninterest Income

Bank Premises and Equipment (Ta

Bank Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Summary of Bank Premises and Equipment	Bank premises and equipment consisted of the following: (In thousands) Cost Accumulated Net December 31, 2020 Premises (including land of $22,586) $ 95,852 $ (28,999) $ 66,853 Furniture and equipment 38,375 (30,111) 8,264 Total $ 134,227 $ (59,110) $ 75,117 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

Goodwill and Acquired Intangi_2

Goodwill and Acquired Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2020
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) 2020 2019 2018 Beginning of year $ 205,286 $ 204,753 $ 147,578 Changes from business combinations 15,890 533 57,175 Total $ 221,176 $ 205,286 $ 204,753
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) 2020 2019 2018 Beginning of year $ 18,305 $ 24,807 $ 18,937 Acquired CDI, including measurement period adjustments 2,129 (676) 10,170 Amortization expense (5,857) (5,826) (4,300) End of year $ 14,577 $ 18,305 $ 24,807 (In months) Remaining average amortization period for CDI 44 47 58
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, 2020 December 31, 2019 (In thousands) Gross Accumulated Gross Accumulated Core deposit intangible $ 38,144 $ (23,567) $ 36,015 $ (17,710)

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2020
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) 2020 2019 2018 Maximum amount outstanding at any month end $ 119,609 $ 193,388 $ 341,213 Weighted average interest rate at end of year 0.16 % 1.17 % 1.14 % Average amount outstanding $ 84,514 $ 106,142 $ 200,839 Weighted average interest rate during the year 0.33 % 1.35 % 0.90 %
Schedule of Collateral Dependent Loans	The following table presents collateral-dependent loans as of: (In thousands) December 31, 2020 December 31, 2019 Construction and land development $ 189 $ 4,926 Commercial real estate - owner-occupied 11,992 2,571 Commercial real estate - non-owner occupied 7,285 3,152 Residential real estate 16,652 11,550 Commercial and financial 11,198 4,338 Consumer 586 141 Totals $ 47,902 $ 26,678 December 31, (In thousands) 2020 2019 2018 Fair value of pledged securities - overnight and continuous: Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities $ 137,268 $ 94,354 $ 246,829
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, 2020: (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, 2020 SBCF Capital Trust I 3/31/2005 n/a 3/31/2035 $ 20,619 $ 20,000 $ 619 3 month LIBOR +175bps 2.00% SBCF Statutory Trust II 12/16/2005 n/a 12/16/2035 20,619 20,000 619 3 month LIBOR +133bps 1.55% SBCF Statutory Trust III 6/29/2007 n/a 6/15/2037 12,372 12,000 372 3 month LIBOR +135bps 1.57% BANKshares, Inc. Statutory Trust I 12/19/2002 10/1/2014 12/26/2032 5,155 5,000 155 3 month LIBOR +325bps 3.50% BANKshares, Inc. Statutory Trust II 3/17/2004 10/1/2014 3/17/2034 4,124 4,000 124 3 month LIBOR +279bps 3.02% BANKshares, Inc. Capital Trust I 12/15/2005 10/1/2014 12/15/2035 5,155 5,000 155 3 month LIBOR +139bps 1.60% Grand Bank Capital Trust I 10/29/2004 7/17/2015 10/29/2034 7,217 7,000 217 3 month LIBOR +198bps 2.20% $ 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, 2020
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) 2020 2019 2018 Share-based compensation expense $ 7,304 $ 7,244 $ 7,823 Income tax benefit (1,737) (1,723) (1,911)
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, 2020 is presented below: (In thousands) Unrecognized Weighted-Average Period Remaining (Years) Restricted stock awards $ 5,987 2.06 Restricted stock units 3,153 1.93 Stock options 96 0.25 Total $ 9,236 2.00
Schedule of Nonvested Share Activity	A summary of the status of the Company’s non-vested RSAs as of December 31, 2020, and changes during the year then ended, is presented below: Restricted Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2020 213,951 $ 26.07 Granted 379,869 18.36 Forfeited/Canceled (11,064) 22.19 Vested (157,602) 23.76 Non-vested at December 31, 2020 425,154 $ 20.03 A summary of the status of the Company’s non-vested RSUs as of December 31, 2020, and changes during the year then ended, is presented below: Restricted Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2020 381,930 $ 23.86 Granted 171,287 17.29 Forfeited/Canceled (12,597) 21.55 Vested (231,023) 19.54 Non-vested at December 31, 2020 309,597 $ 23.54
Schedule of Restricted Stock and Restricted Stock Units Activity	Information regarding restricted stock awards during each of the following years is presented below: For the Year Ended December 31, 2020 2019 2018 Shares granted 379,869 157,861 242,613 Weighted-average grant date fair value $ 18.36 $ 26.86 $ 26.48 Fair value of awards vested 1 $ 3,745 $ 4,128 $ 2,515 1 Based on grant date fair value, in thousands For the Year Ended December 31, 2020 2019 2018 Shares granted 171,287 75,002 173,193 Weighted-average grant date fair value $ 17.29 $ 30.02 $ 24.02 Fair value of awards vested 1 $ 2,962 $ 2,864 $ 1,095 1 Based on grant date fair value, in thousands
Schedule of Stock Option Valuation Assumptions	The Company issued no stock options in 2020. In 2019 and 2018, the 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 Risk-free interest rates 2.53 % 2.56 % Expected dividend yield — % — % Expected volatility 34.50 % 26.60 % Expected lives (years) 5.0 5.0
Schedule of Stock Options Roll Forward	A summary of the Company’s stock options as of December 31, 2020, and changes during the year then ended, is presented below: Options Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term (Years) Aggregate Outstanding at January 1, 2020 903,779 $ 22.22 Granted — — Exercised (62,206) 12.31 Forfeited (1,689) 29.30 Outstanding at December 31, 2020 839,884 $ 22.94 5.29 $ 5,822 Exercisable at December 31, 2020 770,615 $ 22.20 5.12 5,822
Schedule of Stock Option Activity	nformation related to stock options during each of the following years: For the Year Ended December 31, 2020 2019 2018 Options granted — 3,438 219,118 Weighted-average grant date fair value $ — $ 28.42 $ 5.65 Intrinsic value of stock options exercised, in thousands 830 277 3,045
Schedule of Options Outstanding and Remaining Contractual Life of Stock Options	The following table summarizes information related to stock options as of December 31, 2020: Range of Exercise Prices Options Remaining Options Weighted $10.54 to $14.82 311,658 3.1 311,658 $ 12.77 $15.99 to $28.69 320,388 6.1 320,388 27.51 $31.15 to $31.15 207,838 7.3 138,569 31.15 Total 839,884 5.3 770,615 $ 22.20
Schedule of Employee Stock Purchase Plan Activity	Employee contributions to the ESPP are made through payroll deductions. 2020 2019 2018 ESPP shares purchased 19,713 16,320 15,225 Weighted-average employee purchase price $ 20.68 $ 25.39 $ 26.85

Lease Commitments (Tables)

Lease Commitments (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Schedule of Supplemental Lease Cost Information Related to Operating Leases	Lease cost for the year ended December 31, 2020 consists of: For the Year Ended December 31, (In thousands) 2020 2019 Operating lease cost $ 5,738 $ 5,570 Variable lease cost 1,325 1,211 Short-term lease cost 497 715 Sublease income (684) (618) Total lease cost $ 6,876 $ 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, 2020: As of and For the Year Ended December 31, (In thousands, except for weighted average data) 2020 2019 Operating lease right-of-use assets $ 25,538 $ 26,165 Operating lease liabilities 28,959 30,098 Cash paid for amounts included in the measurement of operating lease liabilities 6,035 5,936 Right-of-use assets obtained in exchange for new operating lease obligations 2,095 1,224 Right-of-use assets obtained through bank acquisition 2,343 — Weighted average remaining lease term for operating leases 8.5 years 8.5 years Weighted average discount rate for operating leases 4.62 % 4.70 %
Schedule of Maturities of Lease Liabilities	Maturities of lease liabilities as of December 31, 2020 are as follows: For the Year Ended December 31, 2020 (In thousands) 2021 $ 5,865 2022 5,020 2023 3,849 2024 3,855 2025 3,525 Thereafter 12,075 Total undiscounted cash flows 34,189 Less: Net present value adjustment (5,230) Total $ 28,959

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
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) 2020 2019 2018 Current Federal $ 21,688 $ 20,954 $ 9,078 State 4,471 1,932 — Deferred Federal (2,697) 2,808 7,018 State (644) 4,179 4,163 $ 22,818 $ 29,873 $ 20,259
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 and the reported income tax provision relating to income before income taxes is as follows: For the Year Ended December 31, (In thousands) 2020 2019 2018 Tax rate applied to income before income taxes $ 21,122 $ 27,008 $ 18,381 Increase (decrease) resulting from the effects of: Tax law change (375) — — Nondeductible acquisition costs 199 125 207 Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance (1,110) (1,282) (667) State income taxes (804) (1,283) (874) Tax credit investments (72) (72) (33) Stock compensation (111) (698) (918) Other 142 (36) — Federal tax provision 18,991 23,762 16,096 State tax provision 3,827 6,111 4,163 Total income tax provision $ 22,818 $ 29,873 $ 20,259
Schedule of Deferred Tax Assets and Liabilities	The following is a summary of the significant components of the Company's deferred tax assets and liabilities as of: December 31, (In thousands) 2020 2019 Allowance for credit losses $ 24,158 $ 8,949 Other real estate owned 422 8 Accrued stock compensation 1,973 2,406 Federal tax loss carryforward 2,857 3,601 State tax loss carryforward 1,333 1,110 Alternative minimum tax credit carryforward — 530 Lease liabilities 7,101 7,381 Deferred compensation 2,565 2,458 Accrued interest and fee income 995 3,106 Other 38 378 Gross deferred tax assets 41,442 29,927 Less: Valuation allowance — — Deferred tax assets net of valuation allowance 41,442 29,927 Core deposit base intangible (3,234) (4,005) Net unrealized securities gains (5,890) (1,210) Premises and equipment (534) (114) Right of use assets (6,262) (6,416) Other (1,893) (1,725) Gross deferred tax liabilities (17,813) (13,470) Net deferred tax assets $ 23,629 $ 16,457
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 2017 Florida 2017

Noninterest Income and Expens_2

Noninterest Income and Expenses (Tables)	12 Months Ended
	Dec. 31, 2020
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) 2020 2019 2018 Noninterest Income Service charges on deposit accounts $ 9,429 $ 11,529 $ 11,198 Interchange income 13,711 13,399 12,335 Wealth management income 7,507 6,352 5,915 Mortgage banking fees 14,696 6,490 4,682 Marine finance fees 690 1,054 1,398 SBA gains 685 2,472 2,474 BOLI income 3,561 3,674 4,291 Other income 10,056 10,545 8,352 60,335 55,515 50,645 Securities gains (losses), net 1,235 1,217 (623) Total Noninterest Income $ 61,570 $ 56,732 $ 50,022 Noninterest Expenses Salaries and wages 88,539 73,829 71,111 Employee benefits 15,544 13,697 12,945 Outsourced data processing costs 19,053 15,077 16,374 Telephone and data lines 2,984 2,958 2,481 Occupancy 14,150 14,284 13,394 Furniture and equipment 5,874 6,245 6,744 Marketing 4,833 4,161 5,085 Legal and professional fees 9,167 8,553 9,961 FDIC assessments 1,268 881 2,195 Amortization of intangibles 5,857 5,826 4,300 Foreclosed property expense and net loss on sale 2,263 51 461 Provision for credit losses on unfunded commitments 185 — — Other 15,835 15,177 17,222 Total Noninterest Expenses $ 185,552 $ 160,739 $ 162,273

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Summary of Required Regulatory Capital	At December 31, 2020 and 2019, 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 Minimum for Capital Adequacy Purpose 1 (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Seacoast Banking Corporation of Florida (Consolidated) At December 31, 2020: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 1,029,455 18.51 % n/a n/a $ 444,839 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 970,594 17.46 n/a n/a 333,629 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 899,225 16.17 n/a n/a 250,222 ≥ 4.50 Leverage Ratio (to adjusted average assets) 970,594 11.92 n/a n/a 325,690 ≥ 4.00 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 Seacoast National Bank (A Wholly Owned Bank Subsidiary) At December 31, 2020: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 956,592 17.21 % $ 555,772 ≥ 10.00 % $ 444,617 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 897,731 16.15 444,617 ≥ 8.00 333,463 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 897,727 16.15 361,252 ≥ 6.50 250,097 ≥ 4.50 Leverage Ratio (to adjusted average assets) 897,731 11.03 406,904 ≥ 5.00 325,523 ≥ 4.00 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 1 Excludes the Basel III capital conservation buffer of 2.5%, 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, 2020
Condensed Financial Information Disclosure [Abstract]
Summary of Balance Sheet	Balance Sheets December 31, (In thousands) 2020 2019 Assets Cash $ 70 $ 70 Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days 70,074 52,979 Investment in subsidiaries 1,134,536 1,005,756 Other assets 659 1,515 $ 1,205,339 $ 1,060,320 Liabilities and Shareholders' Equity Subordinated debt $ 71,365 $ 71,085 Other liabilities 3,676 3,700 Shareholders' equity 1,130,298 985,535 $ 1,205,339 $ 1,060,320
Summary of Statements of Income (Loss)	Statements of Income Year Ended December 31, (In thousands) 2020 2019 2018 Income Interest/other $ 270 $ 679 $ 484 Dividends from subsidiary Bank — — — Total income 270 679 484 Interest expense 2,236 3,368 3,165 Other expenses 838 651 879 Total expenses 3,074 4,019 4,044 Loss before income taxes and equity in undistributed income of subsidiaries (2,804) (3,340) (3,560) Income tax benefit (589) (702) (747) Loss before equity in undistributed income of subsidiaries (2,215) (2,638) (2,813) Equity in undistributed income of subsidiaries 79,979 101,377 70,088 Net income $ 77,764 $ 98,739 $ 67,275
Summary of Statement of Cash Flows	Statements of Cash Flows Year Ended December 31, (In thousands) 2020 2019 2018 Cash flows from operating activities Adjustments to reconcile net income to net cash provided Net Income $ 77,764 $ 98,739 $ 67,275 Equity in undistributed income of subsidiaries (79,979) (101,377) (70,088) Net (increase) decrease in other assets 1,772 (738) (10,045) Net increase (decrease) in other liabilities 256 265 (3,431) Net cash used in operating activities (187) (3,111) (16,289) Cash flows from investing activities Net cash paid for bank acquisition (1,462) — (6,558) Investment in unconsolidated subsidiary — (10) — Proceeds from sale of Visa Class B stock — — 21,333 Dividends from bank subsidiary 20,230 18,082 — Increase in securities purchased under agreement to resell, maturing within 30 days, net (17,095) (12,849) (421) Net cash provided by investment activities 1,673 5,223 14,354 Cash flows from financing activities Stock based employment benefit plans (1,486) (2,239) 978 Net cash (used in) provided by financing activities (1,486) (2,239) 978 Net change in cash — (127) (957) Cash at beginning of year 70 197 1,154 Cash at end of year $ 70 $ 70 $ 197 Supplemental disclosure of cash flow information: Cash paid during the period for interest $ 1,992 $ 3,186 $ 2,936

Contingent Liabilities and Co_2

Contingent Liabilities and Commitments with Off-Balance Sheet Risk (Tables)	12 Months Ended
	Dec. 31, 2020
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) 2020 2019 Contract or Notional Amount Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ 1,548,482 $ 1,018,020 Standby letters of credit and financial guarantees written: Secured 11,167 13,073 Unsecured 1,197 663 Unfunded limited partner equity commitment 21,390 6,011

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 and December 31, 2019 included: Fair Value Quoted Prices in Significant Other Significant Other (In thousands) Measurements Level 1 Level 2 Level 3 At December 31, 2020 Financial Assets Available-for-sale debt securities 1 $ 1,398,157 $ 101 $ 1,398,056 $ — Derivative financial instruments 2 14,343 — 14,343 — Loans held for sale 2 68,890 — 68,890 — Loans 3 8,806 — 1,900 6,906 Other real estate owned 4 12,750 — 72 12,678 Equity securities 5 6,530 6,530 — — Financial Liabilities Derivative financial instruments 2 $ 13,339 $ — $ 13,339 $ — At December 31, 2019 Financial Assets 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 — — 1 See “Note D - Securities” for further detail of fair value of individual investment categories. 2 Recurring fair value basis determined using observable market data. 3 See “Note E - Loans”. Nonrecurring fair value adjustments to collateral-dependent loans reflect full or partial write-downs that are based on current appraised values 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, 2020 and 2019 is as follows: December 31, (In thousands) 2020 2019 Aggregate fair value $ 68,890 $ 20,029 Contractual balance 66,415 19,445 Excess 2,475 584
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, 2020 and December 31, 2019 is as follows: Carrying Quoted Prices in Significant Other Significant Other (In thousands) Amount Level 1 Level 2 Level 3 At December 31, 2020 Financial Assets Held-to-maturity debt securities 1 $ 184,484 $ — $ 192,179 $ — Time deposits with other banks 750 — 762 — Loans, net 5,633,810 — — 5,686,019 Financial Liabilities Deposits 6,932,561 — — 6,936,097 Subordinated debt 71,365 — 58,227 — At December 31, 2019 Financial Assets Held-to-maturity debt securities 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 — 1 See “Note D - Securities” 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, 2020
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	In 2020, 2019, and 2018, options to purchase 508,000, 491,000, and 483,000 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) 2020 2019 2018 Basic earnings per share Net Income $ 77,764 $ 98,739 $ 67,275 Total weighted average common stock outstanding 53,502 51,449 47,969 Net income per share $ 1.45 $ 1.92 $ 1.40 Diluted earnings per share Net Income $ 77,764 $ 98,739 $ 67,275 Total weighted average common stock outstanding 53,502 51,449 47,969 Add: Dilutive effect of employee restricted stock and stock options (See “Note K - Employee Benefits and Stock Compensation”) 428 580 779 Total weighted average diluted stock outstanding 53,930 52,029 48,748 Net income per share $ 1.44 $ 1.90 $ 1.38

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Summary of Purchase Price Calculation	The Company acquired 100% of the outstanding common stock of Fourth Street. Under the terms of the definitive agreement, each share of Fourth Street common stock was converted into the right to receive 0.1275 share of Seacoast common stock. (In thousands, except per share data) August 21, 2020 Number of Fourth Street common shares outstanding 11,220 Shares issued upon conversion of convertible debt 5,405 Per share exchange ratio 0.1275 Number of shares of common stock issued 2,120 Multiplied by common stock price per share on August 21, 2020 $ 19.40 Value of common stock issued 41,121 Cash paid for Fourth Street vested stock options 596 Total purchase price $ 41,717 (In thousands, except per share data) March 13, 2020 Number of FBPB common shares outstanding 5,213 Per share exchange ratio 0.2000 Number of shares of common stock issued 1,043 Multiplied by common stock price per share on March 13, 2020 $ 20.17 Value of common stock issued 21,031 Cash paid for FBPB vested stock options 866 Total purchase price $ 21,897 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
Schedule of Business Acquisitions	The fair values initially assigned to assets acquired and liabilities assumed are preliminary and could change for up to one year after the closing date of the acquisition as new information and circumstances relative to closing date fair values becomes known. (In thousands) Initially Measured Assets: Cash $ 38,082 Investment securities 3,498 Loans 303,434 Bank premises and equipment 9,480 Core deposit intangibles 1,310 Goodwill 9,030 Other assets 7,088 Total assets $ 371,922 Liabilities: Deposits $ 329,662 Other liabilities 543 Total liabilities $ 330,205 (In thousands) Initially Measured Measurement Period Adjustments As Adjusted March 13, 2020 Assets: Cash $ 34,749 $ — $ 34,749 Investment securities 447 — 447 Loans 146,839 (62) 146,777 Bank premises and equipment 6,086 — 6,086 Core deposit intangibles 819 — 819 Goodwill 6,799 62 6,861 Other assets 1,285 20 1,305 Total assets $ 197,024 $ 20 $ 197,044 Liabilities: Deposits $ 173,741 $ — $ 173,741 Other liabilities 1,386 20 1,406 Total liabilities $ 175,127 $ 20 $ 175,147 (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
Schedule of Fair Value of Acquired Loans and Unpaid Principal Balance	The table below presents information with respect to the fair value and unpaid principal balance of acquired loans at the acquisition date. August 21, 2020 (In thousands) Book Balance Fair Value Construction and land development $ 9,197 $ 8,851 Commercial real estate - owner-occupied 77,936 75,215 Commercial real estate - non owner-occupied 76,014 71,171 Residential real estate 23,548 23,227 Commercial and financial 72,745 68,096 Consumer 2,748 2,694 PPP loans 55,005 54,180 Total acquired loans $ 317,193 $ 303,434 The table below presents information with respect to the fair value and unpaid principal balance of acquired loans at the acquisition date. March 13, 2020 (In thousands) Book Balance Fair Value Construction and land development $ 9,493 $ 9,012 Commercial real estate - owner-occupied 46,221 45,171 Commercial real estate - non owner-occupied 36,268 35,079 Residential real estate 47,569 47,043 Commercial and financial 9,659 9,388 Consumer 1,132 1,084 Total acquired loans $ 150,342 $ 146,777 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 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
Schedule Purchase Credit Deteriorated Loans Acquired	The table below presents the carrying amount of loans for which, at the date of acquisition, there was evidence of more than insignificant deterioration of credit quality since origination: (In thousands) August 21, 2020 Book balance of loans at acquisition $ 59,455 Allowance for credit losses at acquisition (5,763) Non-credit related discount (4,319) Total PCD loans acquired $ 49,373 The table below presents the carrying amount of loans for which, at the date of acquisition, there was evidence of more than insignificant deterioration of credit quality since origination: (In thousands) March 13, 2020 Book balance of loans at acquisition $ 43,682 Allowance for credit losses at acquisition (516) Non-credit related discount (128) Total PCD loans acquired $ 43,038 (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
Summary of Pro-Forma Data	Pro-forma data as of 2020 and 2019 present information as if the acquisitions of FBPB and Fourth Street occurred at the beginning of 2019: Twelve Months Ended (In thousands, except per share data) 2020 2019 Net interest income 1 $ 274,432 $ 266,033 Net income available to common shareholders 82,179 100,718 EPS - basic $ 1.60 $ 1.88 EPS - diluted $ 1.59 $ 1.86 1 Provisions for credit losses of $1.8 million for FBPB and $4.6 million for Freedom Bank, recorded under CECL at the dates of acquisition, have been excluded from the pro forma information above, which presents information as if the acquisitions had occurred on January 1, 2019, prior to the Company's adoption of CECL.

Significant Accounting Polici_4

Significant Accounting Policies - Additional Information (Details) $ in Thousands	Jan. 01, 2020USD ($)	Dec. 31, 2020USD ($)operating_segment	Dec. 31, 2019USD ($)	Dec. 31, 2018
Accounting Policies [Line Items]
Number of operating segments | operating_segment		1
Increase to amortized cost basis of PCD loans to reflect increase in adjustment to allowance for credit losses		$ 6,279
Unrealized losses		2,098	$ 4,547
Collateralized loan obligations
Accounting Policies [Line Items]
Unrealized losses	$ 1,200	$ 647	$ 1,153
Cumulative Effect Adjustment
Accounting Policies [Line Items]
Increase to amortized cost basis of PCD loans to reflect increase in adjustment to allowance for credit losses	700
Noncredit discount on PCD loans to be accredited into interest income over remaining life of loans	$ 900
Stock Option
Accounting Policies [Line Items]
Stock options, vesting period			5 years	5 years
Vesting period		5 years
Restricted Stock Units
Accounting Policies [Line Items]
Vesting period		3 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

Significant Accounting Polici_5

Significant Accounting Policies - Schedule of Cumulative Effect Adjustments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	$ 5,735,349		$ 5,198,404
Allowance for credit losses	92,733		35,154	$ 32,423	$ 27,122
Reserve for unfunded commitments			140
Deferred tax assets	23,629		16,457
Retained earnings	$ 256,701		195,813
Cumulative Effect Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		$ (706)
Allowance for credit losses		21,226	$ 21,226
Reserve for unfunded commitments		1,837
Deferred tax assets		(5,481)
Retained earnings		(16,876)
Cumulative Effect Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		5,197,698
Allowance for credit losses		56,380
Reserve for unfunded commitments		1,977
Deferred tax assets		10,976
Retained earnings		$ 178,937

Cash, Dividend and Loan Restr_2

Cash, Dividend and Loan Restrictions - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Cash, Dividend and Loan Restrictions [Abstract]
Average balance reserve requirement	$ 0	$ 38.7
Average amount of reserve balances	4.8	$ 7.9
Maximum amount of loans available for transfer	$ 90.1

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, 2020	Dec. 31, 2019
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	$ 1,371,539	$ 940,765
Available for sale, gross unrealized gains	28,716	8,764
Available for sale, gross unrealized losses	(2,098)	(2,674)
Available for sale, fair value	1,398,157	946,855
Held-to-Maturity Debt Securities
Held to maturity, amortized cost	184,484	261,369
Held to maturity, gross unrealized gains	7,818	2,717
Held to maturity, gross unrealized losses	(123)	(1,873)
Held to maturity, fair value	192,179	262,213
U.S. Treasury securities and obligations of U.S. government agencies
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	8,250	9,914
Available for sale, gross unrealized gains	528	204
Available for sale, gross unrealized losses	(1)	(4)
Available for sale, fair value	8,777	10,114
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	1,038,437	604,934
Available for sale, gross unrealized gains	23,457	5,784
Available for sale, gross unrealized losses	(1,240)	(1,511)
Available for sale, fair value	1,060,654	609,207
Held-to-Maturity Debt Securities
Held to maturity, amortized cost	184,484	261,369
Held to maturity, gross unrealized gains	7,818	2,717
Held to maturity, gross unrealized losses	(123)	(1,873)
Held to maturity, fair value	192,179	262,213
Private mortgage-backed securities and collateralized mortgage obligations
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	89,284	56,005
Available for sale, gross unrealized gains	2,131	1,561
Available for sale, gross unrealized losses	(210)	(5)
Available for sale, fair value	91,205	57,561
Held-to-Maturity Debt Securities
Held to maturity, fair value	0
Collateralized loan obligations
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	202,563	239,364
Available for sale, gross unrealized gains	279	7
Available for sale, gross unrealized losses	(647)	(1,153)
Available for sale, fair value	202,195	238,218
Held-to-Maturity Debt Securities
Held to maturity, fair value	0
Obligations of state and political subdivisions
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	33,005	30,548
Available for sale, gross unrealized gains	2,321	1,208
Available for sale, gross unrealized losses	0	(1)
Available for sale, fair value	$ 35,326	$ 31,755

Securities - Additional Informa

Securities - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale of available-for-sale debt securities	$ 96,732,000	$ 202,724,000	$ 64,366,000
Gross gains from sale of securities	2,400,000	2,900,000	200,000
Gross losses from sale of securities	1,300,000	1,800,000	700,000
Unrealized losses	(2,098,000)	(4,547,000)
Fair value of mortgage backed securities of government sponsored entities	405,437,000	527,939,000
Other assets of Federal Home Loan Bank and Federal Reserve Bank	33,900,000
Accrued interest receivable on AFS debt securities	3,200,000	3,800,000
Accrued interest receivable on HTM debt securities	$ 400,000	$ 600,000
Shares held (in shares)	55,243,226	51,513,733
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
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses	$ (1,240,000)	$ (3,384,000)
Fair value of mortgage backed securities of government sponsored entities	203,974,000	324,241,000
Held-to-maturity securities, allowance for credit loss	0
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Unrealized losses	(647,000)	(1,153,000)		$ (1,200,000)
Fair value of mortgage backed securities of government sponsored entities	177,210,000	199,447,000
Allowance for credit losses on AFS debt securities	$ 0
Collateralized loan obligations | Standard & Poor's, AAA Rating
Debt Securities, Available-for-sale [Line Items]
Number of positions held, percentage of total	35.00%
Collateralized loan obligations | Standard & Poor's, AA Rating
Debt Securities, Available-for-sale [Line Items]
Number of positions held, percentage of total	25.00%
Private mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Unrealized losses	$ (210,000)	(5,000)
Fair value of mortgage backed securities of government sponsored entities	23,997,000	2,978,000
Allowance for credit losses on AFS debt securities	$ 0
Average credit support percentage	22.00%
CRA - qualified debt securities
Debt Securities, Available-for-sale [Line Items]
Gross gains from sale of securities	$ 100,000	$ 200,000
Gross losses from sale of securities			$ 100,000
Carrying Value
Debt Securities, Available-for-sale [Line Items]
Other assets	6,500,000
Carrying Value | Public deposits and secured borrowings
Debt Securities, Available-for-sale [Line Items]
Securities pledged as collateral	$ 425,100,000

Securities - Amortized Cost a_2

Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Held to maturity, amortized cost, total	$ 184,484	$ 261,369
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held to maturity, fair value, total	192,179	262,213
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	1,371,539	940,765
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	1,398,157	946,855
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	35
Available for sale, amortized cost, due after one year through five years	11,305
Available for sale, amortized cost, due after five years through ten years	8,590
Available for sale, amortized cost, due after ten years	21,325
Available for sale, amortized cost, total	41,255
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, due in less than one year	35
Available for sale, fair value, due after one year through five years	11,929
Available for sale, fair value, due after five years through ten years	9,323
Available for sale, fair value, due after ten years	22,816
Available for sale, fair value, total	44,103
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	184,484
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held to maturity, fair value, total	192,179	262,213
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	1,038,437	604,934
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	1,060,654	609,207
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
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	89,284	56,005
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	91,205	57,561
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
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	202,563	239,364
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	$ 202,195	$ 238,218

Securities - Schedule of Unreal

Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Fair Value
Less Than 12 Months	$ 332,099		$ 312,988
12 Months or Longer	73,338		214,951
Total	405,437		527,939
Unrealized Losses
Less Than 12 Months	(1,530)		(2,041)
12 Months or Longer	(568)		(2,506)
Total	(2,098)		(4,547)
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less Than 12 Months	0		758
12 Months or Longer	256		0
Total	256		758
Unrealized Losses
Less Than 12 Months	0		(4)
12 Months or Longer	(1)		0
Total	(1)		(4)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	203,405		220,057
12 Months or Longer	569		104,184
Total	203,974		324,241
Unrealized Losses
Less Than 12 Months	(1,218)		(1,461)
12 Months or Longer	(22)		(1,923)
Total	(1,240)		(3,384)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	23,997		2,978
12 Months or Longer	0		0
Total	23,997		2,978
Unrealized Losses
Less Than 12 Months	(210)		(5)
12 Months or Longer	0		0
Total	(210)		(5)
Collateralized loan obligations
Fair Value
Less Than 12 Months	104,697		88,680
12 Months or Longer	72,513		110,767
Total	177,210		199,447
Unrealized Losses
Less Than 12 Months	(102)		(570)
12 Months or Longer	(545)		(583)
Total	$ (647)	$ (1,200)	(1,153)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months			515
12 Months or Longer			0
Total			515
Unrealized Losses
Less Than 12 Months			(1)
12 Months or Longer			0
Total			$ (1)

Loans - Schedule of Portfolio L

Loans - Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 5,735,349	$ 5,198,404
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	245,108	325,113
Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,141,310	1,000,000
Commercial real estate - non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,395,854
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		2,378,971
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,342,628	1,507,863
Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	854,753	778,252
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	188,735	208,205
Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	566,961
Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,711,737	4,317,918
Portfolio Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	216,420	281,335
Portfolio Loans | Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	854,769
Portfolio Loans | Commercial real estate - non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,043,459
Portfolio Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		1,834,811
Portfolio Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,155,914	1,304,305
Portfolio Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	743,846	697,301
Portfolio Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	181,797	200,166
Portfolio Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	515,532
PULs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		867,820
PULs | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		43,618
PULs | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		533,943
PULs | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		201,848
PULs | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		80,372
PULs | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		8,039
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		12,666
PCI Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		160
PCI Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		10,217
PCI Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		1,710
PCI Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		579
PCI Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		0
Acquired Non-PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	925,434	867,820
Acquired Non-PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	26,250	43,618
Acquired Non-PCD Loans | Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	247,090
Acquired Non-PCD Loans | Commercial real estate - non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	323,273
Acquired Non-PCD Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		533,943
Acquired Non-PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	176,105	201,848
Acquired Non-PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	94,627	80,372
Acquired Non-PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,660	8,039
Acquired Non-PCD Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	51,429
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	98,178	12,666
PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,438	160
PCD Loans | Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	39,451
PCD Loans | Commercial real estate - non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	29,122
PCD Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		10,217
PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	10,609	1,710
PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	16,280	579
PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	278	$ 0
PCD Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0

Loans - Additional Information

Loans - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020USD ($)contract	Dec. 31, 2019USD ($)contract	Dec. 31, 2018USD ($)contract	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net deferred costs		$ 19,900,000
Remaining fair value adjustment for loans acquired	$ 30,200,000	$ 34,900,000
Percentage of fair value adjustment for loans acquired	2.86%	3.80%
Accrued interest receivable	$ 25,800,000	$ 14,900,000
Interest income on nonaccrual loans	900,000	1,300,000	$ 400,000
Loans to directors and executive officers	1,100,000	1,700,000
New loans offered	0
Value of loans deferred, not classified as TDRs	$ 74,062,000			$ 702,650,000	$ 1,077,043,000
Percentage on payment deferral	1.00%				21.00%
Allowance for credit loss on TDRs	$ 200,000	$ 0	$ 500,000
Number of loans under trouble debt restructuring | contract	0	4	0
Value of loans under trouble debt restructuring modified in preceding twelve months		$ 3,200,000
Interest income related to impaired loans with impairment measured on present value of expected future cash flows	$ 100,000	$ 100,000	$ 200,000
Portfolio Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net deferred costs	22,600,000
Portfolio Loans | Paycheck Protection Program
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net deferred fees	$ 9,500,000

Loans - Past Due Financing Rece

Loans - Past Due Financing Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Current	$ 5,689,158	$ 5,163,098
Nonaccrual	36,110	26,955
Loans	5,735,349	5,198,404
Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	6,382	7,259
Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	3,636	984
Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	63	108
Construction and land development
Financing Receivable, Past Due [Line Items]
Nonaccrual	167	4,937
Loans	245,108	325,113
Commercial real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual		6,520
Loans		2,378,971
Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Nonaccrual	8,181
Loans	1,141,310	1,000,000
Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Nonaccrual	8,084
Loans	1,395,854
Residential real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	12,492	9,480
Loans	1,342,628	1,507,863
Commercial and financial
Financing Receivable, Past Due [Line Items]
Nonaccrual	6,604	5,908
Loans	854,753	778,252
Consumer
Financing Receivable, Past Due [Line Items]
Nonaccrual	582	110
Loans	188,735	208,205
Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Loans	566,961
Portfolio Loans
Financing Receivable, Past Due [Line Items]
Current	4,685,456	4,290,227
Nonaccrual	18,270	20,990
Loans	4,711,737	4,317,918
Portfolio Loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	4,416	6,040
Portfolio Loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	3,532	553
Portfolio Loans | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	63	108
Portfolio Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Current	216,262	276,984
Nonaccrual	158	4,351
Loans	216,420	281,335
Portfolio Loans | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Current		1,828,629
Nonaccrual		4,356
Loans		1,834,811
Portfolio Loans | Commercial real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		1,606
Portfolio Loans | Commercial real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		220
Portfolio Loans | Commercial real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
Portfolio Loans | Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Current	851,222
Nonaccrual	2,471
Loans	854,769
Portfolio Loans | Commercial real estate - owner occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,076
Portfolio Loans | Commercial real estate - owner occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Portfolio Loans | Commercial real estate - owner occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Portfolio Loans | Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Current	1,041,306
Nonaccrual	2,153
Loans	1,043,459
Portfolio Loans | Commercial real estate - non-owner occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Portfolio Loans | Commercial real estate - non-owner occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Portfolio Loans | Commercial real estate - non-owner occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Portfolio Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Current	1,142,893	1,294,778
Nonaccrual	8,531	7,945
Loans	1,155,914	1,304,305
Portfolio Loans | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	3,002	1,564
Portfolio Loans | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,427	18
Portfolio Loans | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	61	0
Portfolio Loans | Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	737,362	690,412
Nonaccrual	4,382	4,228
Loans	743,846	697,301
Portfolio Loans | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	135	2,553
Portfolio Loans | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,967	0
Portfolio Loans | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	108
Portfolio Loans | Consumer
Financing Receivable, Past Due [Line Items]
Current	180,879	199,424
Nonaccrual	575	110
Loans	181,797	200,166
Portfolio Loans | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	203	317
Portfolio Loans | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	138	315
Portfolio Loans | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	2	0
Portfolio Loans | Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Current	515,532
Nonaccrual	0
Loans	515,532
Portfolio Loans | Paycheck Protection Program | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Portfolio Loans | Paycheck Protection Program | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Portfolio Loans | Paycheck Protection Program | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Current	915,799	862,272
Nonaccrual	7,690	3,898
Loans	925,434	867,820
Acquired Non-PCD Loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,841	1,219
Acquired Non-PCD Loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	104	431
Acquired Non-PCD Loans | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Current	26,250	43,044
Nonaccrual	0	574
Loans	26,250	43,618
Acquired Non-PCD Loans | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Current		531,325
Nonaccrual		1,245
Loans		533,943
Acquired Non-PCD Loans | Commercial real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		942
Acquired Non-PCD Loans | Commercial real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		431
Acquired Non-PCD Loans | Commercial real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
Acquired Non-PCD Loans | Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Current	244,486
Nonaccrual	2,604
Loans	247,090
Acquired Non-PCD Loans | Commercial real estate - owner occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Acquired Non-PCD Loans | Commercial real estate - owner occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Acquired Non-PCD Loans | Commercial real estate - owner occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Acquired Non-PCD Loans | Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Current	322,264
Nonaccrual	1,009
Loans	323,273
Acquired Non-PCD Loans | Commercial real estate - non-owner occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Acquired Non-PCD Loans | Commercial real estate - non-owner occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Acquired Non-PCD Loans | Commercial real estate - non-owner occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Acquired Non-PCD Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Current	171,507	201,159
Nonaccrual	2,889	412
Loans	176,105	201,848
Acquired Non-PCD Loans | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,605	277
Acquired Non-PCD Loans | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	104	0
Acquired Non-PCD Loans | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	93,223	78,705
Nonaccrual	1,188	1,667
Loans	94,627	80,372
Acquired Non-PCD Loans | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	216	0
Acquired Non-PCD Loans | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Consumer
Financing Receivable, Past Due [Line Items]
Current	6,640	8,039
Nonaccrual	0	0
Loans	6,660	8,039
Acquired Non-PCD Loans | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	20	0
Acquired Non-PCD Loans | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Current	51,429
Nonaccrual	0
Loans	51,429
Acquired Non-PCD Loans | Paycheck Protection Program | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Acquired Non-PCD Loans | Paycheck Protection Program | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Acquired Non-PCD Loans | Paycheck Protection Program | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans
Financing Receivable, Past Due [Line Items]
Current	87,903	10,599
Nonaccrual	10,150	2,067
Loans	98,178	12,666
PCD Loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	125	0
PCD Loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Current	2,429	148
Nonaccrual	9	12
Loans	2,438	160
PCD Loans | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Current		9,298
Nonaccrual		919
Loans		10,217
PCD Loans | Commercial real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans | Commercial real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans | Commercial real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans | Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Current	36,345
Nonaccrual	3,106
Loans	39,451
PCD Loans | Commercial real estate - owner occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans | Commercial real estate - owner occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans | Commercial real estate - owner occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans | Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Current	24,200
Nonaccrual	4,922
Loans	29,122
PCD Loans | Commercial real estate - non-owner occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans | Commercial real estate - non-owner occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans | Commercial real estate - non-owner occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Current	9,537	587
Nonaccrual	1,072	1,123
Loans	10,609	1,710
PCD Loans | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	15,121	566
Nonaccrual	1,034	13
Loans	16,280	579
PCD Loans | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	125	0
PCD Loans | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Consumer
Financing Receivable, Past Due [Line Items]
Current	271	0
Nonaccrual	7	0
Loans	278	0
PCD Loans | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	$ 0
PCD Loans | Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Loans	$ 0

Loans - Schedule of Nonaccrual

Loans - Schedule of Nonaccrual Loans by Loan Category (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	$ 26,624	$ 23,301
Nonaccrual loans with allowance for credit losses	9,486	3,654
Nonaccrual loans with no related allowance for credit losses, total loans	36,110	26,955
Nonaccrual loans, allowance for credit losses	5,832	2,384
Construction and land development
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	148	4,914
Nonaccrual loans with allowance for credit losses	19	23
Nonaccrual loans with no related allowance for credit losses, total loans	167	4,937
Nonaccrual loans, allowance for credit losses	8	12
Commercial real estate - owner occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	7,893
Nonaccrual loans with allowance for credit losses	288
Nonaccrual loans with no related allowance for credit losses, total loans	8,181
Nonaccrual loans, allowance for credit losses	287
Commercial real estate - non-owner occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	5,666
Nonaccrual loans with allowance for credit losses	2,418
Nonaccrual loans with no related allowance for credit losses, total loans	8,084
Nonaccrual loans, allowance for credit losses	1,640
Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses		6,200
Nonaccrual loans with allowance for credit losses		320
Nonaccrual loans with no related allowance for credit losses, total loans		6,520
Nonaccrual loans, allowance for credit losses		149
Residential real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	9,520	8,700
Nonaccrual loans with allowance for credit losses	2,972	780
Nonaccrual loans with no related allowance for credit losses, total loans	12,492	9,480
Nonaccrual loans, allowance for credit losses	1,587	564
Commercial and financial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	3,175	3,448
Nonaccrual loans with allowance for credit losses	3,429	2,460
Nonaccrual loans with no related allowance for credit losses, total loans	6,604	5,908
Nonaccrual loans, allowance for credit losses	2,235	1,622
Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	222	39
Nonaccrual loans with allowance for credit losses	360	71
Nonaccrual loans with no related allowance for credit losses, total loans	582	110
Nonaccrual loans, allowance for credit losses	$ 75	$ 37

Loans - Schedule of Collateral

Loans - Schedule of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	$ 47,902	$ 26,678
Construction and land development
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	189	4,926
Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	11,992	2,571
Commercial real estate - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	7,285	3,152
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	16,652	11,550
Commercial and financial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	11,198	4,338
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	$ 586	$ 141

Loans - Risk Categories of Loan

Loans - Risk Categories of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 1,309,434
2019	912,701
2018	779,840
2017	589,022
2016	582,417
Prior	928,105
Revolving	633,830
Total	5,735,349	$ 5,198,404
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,302,389
2019	898,213
2018	741,734
2017	562,336
2016	553,531
Prior	885,576
Revolving	628,070
Total	5,571,849	5,091,691
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,108
2019	3,507
2018	19,722
2017	13,953
2016	14,820
Prior	7,235
Revolving	2,544
Total	67,889	51,560
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	504
2019	41
2018	12,725
2017	7,256
2016	10,823
Prior	14,083
Revolving	1,092
Total	46,524	53,958
Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	433
2019	10,940
2018	5,659
2017	5,477
2016	3,243
Prior	21,211
Revolving	2,104
Total	49,067
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	20
Total	20	1,195
Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
2020	62,313
2019	52,629
2018	51,985
2017	15,910
2016	7,335
Prior	19,612
Revolving	35,324
Total	245,108	325,113
Construction and land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	62,107
2019	52,384
2018	46,067
2017	15,873
2016	7,335
Prior	17,873
Revolving	35,324
Total	236,963	317,765
Construction and land development | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	206
2019	245
2018	5,918
2017	0
2016	0
Prior	1,449
Revolving	0
Total	7,818	2,235
Construction and land development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	51
Revolving	0
Total	51	5,113
Construction and land development | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	37
2016	0
Prior	239
Revolving	0
Total	276
Construction and land development | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	0	0
Commercial real estate - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	161,726
2019	203,568
2018	160,328
2017	144,412
2016	154,815
Prior	302,204
Revolving	14,257
Total	1,141,310	1,000,000
Commercial real estate - owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	155,953
2019	198,559
2018	156,276
2017	138,341
2016	148,389
Prior	287,772
Revolving	14,255
Total	1,099,545
Commercial real estate - owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	5,773
2019	1,858
2018	3,305
2017	0
2016	4,471
Prior	4,050
Revolving	2
Total	19,459
Commercial real estate - owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019
2018	0
2017	4,709
2016	1,955
Prior	5,508
Revolving	0
Total	12,172
Commercial real estate - owner occupied | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	3,151
2018	747
2017	1,362
2016	0
Prior	4,874
Revolving	0
Total	10,134
Commercial real estate - owner occupied | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	0
Commercial real estate - non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	159,299
2019	316,136
2018	220,308
2017	130,937
2016	194,299
Prior	366,279
Revolving	8,596
Total	1,395,854
Commercial real estate - non-owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	159,299
2019	313,287
2018	201,112
2017	123,357
2016	175,623
Prior	356,943
Revolving	8,596
Total	1,338,217
Commercial real estate - non-owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	431
2018	9,487
2017	7,580
2016	10,240
Prior	114
Revolving	0
Total	27,852
Commercial real estate - non-owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	9,709
2017	0
2016	8,311
Prior	3,682
Revolving	0
Total	21,702
Commercial real estate - non-owner occupied | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	2,418
2018	0
2017	0
2016	125
Prior	5,540
Revolving	0
Total	8,083
Commercial real estate - non-owner occupied | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	0
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total		2,378,971
Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total		2,331,725
Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total		26,827
Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total		20,098
Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total		321
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	97,278
2019	145,055
2018	205,630
2017	208,424
2016	161,327
Prior	171,831
Revolving	353,083
Total	1,342,628	1,507,863
Residential real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	96,819
2019	144,329
2018	204,077
2017	205,046
2016	160,612
Prior	159,742
Revolving	350,502
Total	1,321,127	1,482,278
Residential real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	33
2017	720
2016	0
Prior	966
Revolving	479
Total	2,198	7,364
Residential real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	350
2019	0
2018	0
2017	896
2016	0
Prior	1,452
Revolving	100
Total	2,798	18,221
Residential real estate | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	109
2019	726
2018	1,520
2017	1,762
2016	715
Prior	9,671
Revolving	2,002
Total	16,505
Residential real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	0	0
Commercial and financial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	215,316
2019	152,093
2018	110,949
2017	70,295
2016	42,386
Prior	58,336
Revolving	205,378
Total	854,753	778,252
Commercial and financial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	214,774
2019	146,511
2018	103,769
2017	60,782
2016	39,692
Prior	53,758
Revolving	204,304
Total	823,590	755,957
Commercial and financial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	71
2019	946
2018	965
2017	5,612
2016	67
Prior	635
Revolving	209
Total	8,505	11,925
Commercial and financial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	154
2019	41
2018	3,016
2017	1,609
2016	553
Prior	3,239
Revolving	764
Total	9,376	9,496
Commercial and financial | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	317
2019	4,595
2018	3,199
2017	2,292
2016	2,074
Prior	704
Revolving	81
Total	13,262
Commercial and financial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	20
Total	20	874
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	46,541
2019	43,220
2018	30,640
2017	19,044
2016	22,255
Prior	9,843
Revolving	17,192
Total	188,735	208,205
Consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	46,476
2019	43,143
2018	30,433
2017	18,937
2016	21,880
Prior	9,488
Revolving	15,089
Total	185,446	203,966
Consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	58
2019	27
2018	14
2017	41
2016	42
Prior	21
Revolving	1,854
Total	2,057	3,209
Consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	42
2016	4
Prior	151
Revolving	228
Total	425	1,030
Consumer | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	7
2019	50
2018	193
2017	24
2016	329
Prior	183
Revolving	21
Total	807
Consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	0	$ 0
Paycheck Protection Program
Financing Receivable, Credit Quality Indicator [Line Items]
2020	566,961
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	566,961
Paycheck Protection Program | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	566,961
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	$ 566,961

Loans - Schedule of Loans in De

Loans - Schedule of Loans in Deferral (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs, excluding PPP loans	$ 74,062	$ 702,650	$ 1,077,043
Construction and land development
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs, excluding PPP loans	1,032	9,359	14,488
Commercial real estate - owner occupied
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs, excluding PPP loans	14,248	204,710	320,406
Commercial real estate - non-owner occupied
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs, excluding PPP loans	32,549	344,573	445,311
Residential real estate
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs, excluding PPP loans	12,839	75,885	148,035
Commercial and financial
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs, excluding PPP loans	11,915	61,308	130,877
Consumer
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs, excluding PPP loans	$ 1,479	$ 6,815	$ 17,926

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)contract	Dec. 31, 2019USD ($)contract	Dec. 31, 2018USD ($)contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	10	9	4
Pre- Modification Outstanding Recorded Investment	$ 699	$ 4,704	$ 159
Value of loans modified in troubled debt restructurings	$ 699	$ 4,704	$ 159
Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0	0
Pre- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Value of loans modified in troubled debt restructurings	$ 0	$ 0	$ 0
Commercial real estate - owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	2	0
Pre- Modification Outstanding Recorded Investment	$ 0	$ 2,166	$ 0
Value of loans modified in troubled debt restructurings	$ 0	$ 2,166	$ 0
Commercial real estate - non-owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0
Pre- Modification Outstanding Recorded Investment	$ 0
Value of loans modified in troubled debt restructurings	$ 0
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	2	3	0
Pre- Modification Outstanding Recorded Investment	$ 150	$ 1,193	$ 0
Value of loans modified in troubled debt restructurings	$ 150	$ 1,193	$ 0
Commercial and financial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	4	3	1
Pre- Modification Outstanding Recorded Investment	$ 437	$ 1,326	$ 98
Value of loans modified in troubled debt restructurings	$ 437	$ 1,326	$ 98
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	4	1	3
Pre- Modification Outstanding Recorded Investment	$ 112	$ 19	$ 61
Value of loans modified in troubled debt restructurings	$ 112	$ 19	$ 61

Allowance for Credit Losses - A

Allowance for Credit Losses - Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 35,154	$ 35,154	$ 32,423	$ 27,122
Initial Allowance on PCD Loans Acquired During the Period		6,279
Provision for credit losses		37,779	10,999	11,730
Charge- Offs		(9,842)	(10,559)	(8,026)
Recoveries		2,251	2,420	1,789
TDR Allowance Adjustments		(114)	(129)	(192)
Ending Balance		92,733	35,154	32,423
Provision for credit losses on accrued interest receivable		400
Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,842	1,842	2,233	1,642
Initial Allowance on PCD Loans Acquired During the Period		87
Provision for credit losses		1,399	(421)	564
Charge- Offs		0	0	0
Recoveries		114	31	27
TDR Allowance Adjustments		(1)	(1)	0
Ending Balance		4,920	1,842	2,233
Commercial real estate - owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	5,361	5,361
Initial Allowance on PCD Loans Acquired During the Period		1,161
Provision for credit losses		3,632
Charge- Offs		(310)
Recoveries		18
TDR Allowance Adjustments		(74)
Ending Balance		9,868	5,361
Commercial real estate - non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7,863	7,863
Initial Allowance on PCD Loans Acquired During the Period		2,236
Provision for credit losses		18,966
Charge- Offs		(177)
Recoveries		37
TDR Allowance Adjustments		0
Ending Balance		38,266	7,863
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	13,224	13,224	11,112	9,285
Provision for credit losses			1,677	4,736
Charge- Offs			(248)	(3,139)
Recoveries			744	292
TDR Allowance Adjustments			(61)	(62)
Ending Balance			13,224	11,112
Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7,667	7,667	7,775	7,131
Initial Allowance on PCD Loans Acquired During the Period		124
Provision for credit losses		3,840	(231)	29
Charge- Offs		(240)	(152)	(80)
Recoveries		350	338	816
TDR Allowance Adjustments		(28)	(63)	(121)
Ending Balance		17,500	7,667	7,775
Commercial and financial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	9,716	9,716	8,585	7,297
Initial Allowance on PCD Loans Acquired During the Period		2,643
Provision for credit losses		8,329	7,969	4,359
Charge- Offs		(7,091)	(7,550)	(3,396)
Recoveries		1,416	712	325
TDR Allowance Adjustments		0	0	0
Ending Balance		18,690	9,716	8,585
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,705	2,705	2,718	1,767
Initial Allowance on PCD Loans Acquired During the Period		28
Provision for credit losses		1,613	2,005	2,042
Charge- Offs		(2,024)	(2,609)	(1,411)
Recoveries		316	595	329
TDR Allowance Adjustments		(11)	(4)	(9)
Ending Balance		3,489	2,705	$ 2,718
Paycheck Protection Program
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0	0
Initial Allowance on PCD Loans Acquired During the Period		0
Provision for credit losses		0
Charge- Offs		0
Recoveries		0
TDR Allowance Adjustments		0
Ending Balance		0	0
Cumulative Effect Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	21,226	21,226
Initial Allowance on PCD Loans Acquired During the Period	700
Ending Balance	21,226		21,226
Cumulative Effect Adjustment | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,479	1,479
Ending Balance			1,479
Cumulative Effect Adjustment | Commercial real estate - owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	80	80
Ending Balance			80
Cumulative Effect Adjustment | Commercial real estate - non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	9,341	9,341
Ending Balance			9,341
Cumulative Effect Adjustment | Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	5,787	5,787
Ending Balance			5,787
Cumulative Effect Adjustment | Commercial and financial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,677	3,677
Ending Balance			3,677
Cumulative Effect Adjustment | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	862	862
Ending Balance			862
Cumulative Effect Adjustment | Paycheck Protection Program
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 0	$ 0
Ending Balance			$ 0

Allowance for Credit Losses - S

Allowance for Credit Losses - Schedule of Loan Portfolio, Excluding PCI Loans and Related Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Recorded Investment
Individually Evaluated	$ 49,196	$ 48,762
Collectively Evaluated	5,686,153	5,149,642
Total	5,735,349	5,198,404
Associated Allowance
Individually Evaluated	7,708	2,858
Collectively Evaluated	85,025	32,296
Total	92,733	35,154	$ 32,423	$ 27,122
Construction and land development
Recorded Investment
Individually Evaluated	276	5,217
Collectively Evaluated	244,832	319,896
Total	245,108	325,113
Associated Allowance
Individually Evaluated	13	14
Collectively Evaluated	4,907	1,828
Total	4,920	1,842	2,233	1,642
Commercial real estate - owner occupied
Recorded Investment
Individually Evaluated	10,243
Collectively Evaluated	1,131,067
Total	1,141,310	1,000,000
Associated Allowance
Individually Evaluated	402
Collectively Evaluated	9,466
Total	9,868	5,361
Commercial real estate - non-owner occupied
Recorded Investment
Individually Evaluated	8,083
Collectively Evaluated	1,387,771
Total	1,395,854
Associated Allowance
Individually Evaluated	1,640
Collectively Evaluated	36,626
Total	38,266	7,863
Commercial real estate
Recorded Investment
Individually Evaluated		20,484
Collectively Evaluated		2,358,487
Total		2,378,971
Associated Allowance
Individually Evaluated		220
Collectively Evaluated		13,004
Total		13,224	11,112	9,285
Residential real estate
Recorded Investment
Individually Evaluated	16,506	16,093
Collectively Evaluated	1,326,122	1,491,770
Total	1,342,628	1,507,863
Associated Allowance
Individually Evaluated	2,064	834
Collectively Evaluated	15,436	6,833
Total	17,500	7,667	7,775	7,131
Commercial and financial
Recorded Investment
Individually Evaluated	13,281	6,631
Collectively Evaluated	841,472	771,621
Total	854,753	778,252
Associated Allowance
Individually Evaluated	3,498	1,731
Collectively Evaluated	15,192	7,985
Total	18,690	9,716	8,585	7,297
Consumer
Recorded Investment
Individually Evaluated	807	337
Collectively Evaluated	187,928	207,868
Total	188,735	208,205
Associated Allowance
Individually Evaluated	91	59
Collectively Evaluated	3,398	2,646
Total	3,489	2,705	$ 2,718	$ 1,767
Paycheck Protection Program
Recorded Investment
Individually Evaluated	0
Collectively Evaluated	566,961
Total	566,961
Associated Allowance
Individually Evaluated	0
Collectively Evaluated	0
Total	$ 0	$ 0

Derivatives - Additional Inform

Derivatives - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)contract	Dec. 31, 2019USD ($)
Back-to-Back Swaps
Derivative [Line Items]
Notional amount	$ 182,379	$ 124,606
Weighted average maturity (in years)	7 years 6 months
Back-to-Back Swaps | Other Assets and Other Liabilities
Derivative [Line Items]
Fair value of derivatives assets and liabilities	$ 13,339	$ 4,817
Interest Rate Floor
Derivative [Line Items]
Notional amount	$ 300,000
Number of derivative contracts | contract	2
Amount expected to be reclassified from accumulated other comprehensive income into interest income	$ 200
Interest Rate Floor | Other Assets
Derivative [Line Items]
Fair value of derivatives assets and liabilities	1,004
Fair value of derivative assets	1,000
Interest Rate Floor, October 2023 Maturity
Derivative [Line Items]
Notional amount	150,000
Interest Rate Floor, November 2023 Maturity
Derivative [Line Items]
Notional amount	$ 150,000

Derivatives - Schedule of Deriv

Derivatives - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Back-to-Back Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 182,379	$ 124,606
Back-to-Back Swaps | Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in OCI	0	0
Reclassification from AOCI into income	0	0
Back-to-Back Swaps | Other Assets and Other Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivatives assets and liabilities	13,339	$ 4,817
Interest Rate Floor
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	300,000
Interest Rate Floor | Loan Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in OCI	(185)
Reclassification from AOCI into income	18
Interest Rate Floor | Other Assets
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivatives assets and liabilities	1,004
Fair value of derivative assets	$ 1,000

Bank Premises and Equipment - S

Bank Premises and Equipment - Summary of Bank Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Cost	$ 134,227	$ 120,384
Accumulated Depreciation & Amortization	(59,110)	(53,769)
Net Carrying Value	75,117	66,615
Land	22,586	18,546
Premises
Property, Plant and Equipment [Line Items]
Cost	95,852	83,020
Accumulated Depreciation & Amortization	(28,999)	(26,180)
Net Carrying Value	66,853	56,840
Furniture and Equipment
Property, Plant and Equipment [Line Items]
Cost	38,375	37,364
Accumulated Depreciation & Amortization	(30,111)	(27,589)
Net Carrying Value	$ 8,264	$ 9,775

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning of year	$ 205,286	$ 204,753	$ 147,578
Changes from business combinations	15,890	533	57,175
Total	$ 221,176	$ 205,286	$ 204,753

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-lived Intangible Assets [Roll Forward]
Beginning of year	$ 18,305	$ 24,807	$ 18,937
Acquired CDI, including measurement period adjustments	2,129	(676)	10,170
Amortization expense	(5,857)	(5,826)	(4,300)
End of year	$ 14,577	$ 18,305	$ 24,807
Remaining average amortization period for CDI	44 months	47 months	58 months

Goodwill and Acquired Intangi_5

Goodwill and Acquired Intangible Assets - Acquired Intangible Assets Consist of Core Deposit Intangibles (Details) - Core deposit intangible - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 38,144	$ 36,015
Accumulated Amortization	$ (23,567)	$ (17,710)

Goodwill and Acquired Intangi_6

Goodwill and Acquired Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
2021 amortization expense	$ 4.8
2022 amortization expense	4.3
2023 amortization expense	3.5
2024 amortization expense	0.9
2025 amortization expense	0.5
Mortgage service rights retained from sale of SBA	$ 2.2	$ 1.8

Borrowings - Federal Funds Purc

Borrowings - Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Maximum amount outstanding at any month end	$ 119,609	$ 193,388	$ 341,213
Weighted average interest rate at end of year	0.16%	1.17%	1.14%
Average amount outstanding	$ 84,514	$ 106,142	$ 200,839
Weighted average interest rate during the year	0.33%	1.35%	0.90%

Borrowings - Schedule of Collat

Borrowings - Schedule of Collateral Type and Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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:	$ 137,268	$ 94,354	$ 246,829

Borrowings - Additional Informa

Borrowings - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Secured lines of credit	$ 1,800,000,000
Secured Lines of Credit
Debt Instrument [Line Items]
Advances from Federal Home Loan Banks	$ 0
Weighted average interest rate on Federal Home Loan Bank advances during the year	1.10%
Trust I & II
Debt Instrument [Line Items]
Junior subordinated deferrable interest notes issued	$ 41,200,000
SBCF Statutory Trust III
Debt Instrument [Line Items]
Junior subordinated deferrable interest notes issued	$ 12,400,000

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, 2020USD ($)
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	2.00%
SBCF Capital Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
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	1.55%
SBCF Statutory Trust II | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.33%
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	1.57%
SBCF Statutory Trust III | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
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	3.50%
BANKshares, Inc. Statutory Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.25%
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	3.02%
BANKshares, Inc. Statutory Trust II | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.79%
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	1.60%
BANKshares, Inc. Capital Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.39%
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	2.20%
Grand Bank Capital Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.98%

Employee Benefits and Stock C_3

Employee Benefits and Stock Compensation - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 23, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined contribution plan charges to operations	$ 2.8	$ 2.4	$ 2.1
Number of shares authorized for issuance (in shares)					4,250,000
Number of shares authorized for repurchase (in shares)	100,000,000
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)	535,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for repurchase (in shares)	300,000
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%	225.00%	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, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Share-based compensation expense	$ 7,304	$ 7,244	$ 7,823
Income tax benefit	$ (1,737)	$ (1,723)	$ (1,911)

Employee Benefits and Stock C_5

Employee Benefits and Stock Compensation - Summary of Unrecognized Compensation Cost (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 9,236
Weighted-Average Period Remaining (Years)	2 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 5,987
Weighted-Average Period Remaining (Years)	2 years 21 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 3,153
Weighted-Average Period Remaining (Years)	1 year 11 months 4 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 96
Weighted-Average Period Remaining (Years)	3 months

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, 2020$ / sharesshares
Restricted Stock
Restricted Award Shares
Non-vested beginning balance (in shares) | shares	213,951
Granted (in shares) | shares	379,869
Forfeited/Cancelled (in shares) | shares	(11,064)
Vested (in shares) | shares	(157,602)
Non-vested ending balance (in shares) | shares	425,154
Weighted-Average Grant-Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 26.07
Granted (in dollars per share) | $ / shares	18.36
Forfeited/Cancelled (in dollars per share) | $ / shares	22.19
Vested (in dollars per share) | $ / shares	23.76
Non-vested at ending of period (in dollars per share) | $ / shares	$ 20.03
Restricted Stock Units
Restricted Award Shares
Non-vested beginning balance (in shares) | shares	381,930
Granted (in shares) | shares	171,287
Forfeited/Cancelled (in shares) | shares	(12,597)
Vested (in shares) | shares	(231,023)
Non-vested ending balance (in shares) | shares	309,597
Weighted-Average Grant-Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 23.86
Granted (in dollars per share) | $ / shares	17.29
Forfeited/Cancelled (in dollars per share) | $ / shares	21.55
Vested (in dollars per share) | $ / shares	19.54
Non-vested at ending of period (in dollars per share) | $ / shares	$ 23.54

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	379,869	157,861	242,613
Weighted-average grant date fair value (in dollars per share)	$ 18.36	$ 26.86	$ 26.48
Fair value of awards vested	$ 3,745	$ 4,128	$ 2,515
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	171,287	75,002	173,193
Weighted-average grant date fair value (in dollars per share)	$ 17.29	$ 30.02	$ 24.02
Fair value of awards vested	$ 2,962	$ 2,864	$ 1,095

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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rates	2.53%	2.56%
Expected dividend yield	0.00%	0.00%
Expected volatility	34.50%	26.60%
Expected lives (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, 2020USD ($)$ / sharesshares
Options
Options, outstanding at beginning of period (in shares) | shares	903,779
Options granted (in shares) | shares	0
Options, exercised (in shares) | shares	(62,206)
Options, forfeited (in shares) | shares	(1,689)
Options, outstanding at end of period (in shares) | shares	839,884
Options, exercisable at end of period (in shares) | shares	770,615
Weighted-Average Exercise Price
Weighted-average exercise price at beginning of period (in dollars per share) | $ / shares	$ 22.22
Weighted-average exercise price, granted (in dollars per share) | $ / shares	0
Weighted-average exercise price, exercised (in dollars per share) | $ / shares	12.31
Weighted-average exercise price, forfeited (in dollars per share) | $ / shares	29.30
Weighted-average exercise price at end of period (in dollars per share) | $ / shares	22.94
Weighted-average exercise price, exercisable at end of period (in dollars per share) | $ / shares	$ 22.20
Weighted- Average Remaining Contractual Term and Aggregate Intrinsic Value
Weighted-average remaining contractual term, outstanding	5 years 3 months 14 days
Weighted-average remaining contractual term, exercisable	5 years 1 month 13 days
Aggregate intrinsic value, outstanding | $	$ 5,822
Aggregate intrinsic value, exercisable | $	$ 5,822

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	0	3,438	219,118
Weighted-average grant date fair value (in dollars per share)	$ 0	$ 28.42	$ 5.65
Intrinsic value of stock options exercised, in thousands	$ 830	$ 277	$ 3,045

Employee Benefits and Stock _11

Employee Benefits and Stock Compensation - Summary of Information Related to Stock Options (Details)	12 Months Ended
	Dec. 31, 2020$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	839,884
Remaining Contractual Life (Years)	5 years 3 months 18 days
Options exercisable (in shares) | shares	770,615
Weighted average exercise price (in dollars per share)	$ 22.20
$10.54 to $14.82
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	311,658
Remaining Contractual Life (Years)	3 years 1 month 6 days
Options exercisable (in shares) | shares	311,658
Weighted average exercise price (in dollars per share)	$ 12.77
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	320,388
Remaining Contractual Life (Years)	6 years 1 month 6 days
Options exercisable (in shares) | shares	320,388
Weighted average exercise price (in dollars per share)	$ 27.51
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	207,838
Remaining Contractual Life (Years)	7 years 3 months 18 days
Options exercisable (in shares) | shares	138,569
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, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	19,713	16,320	15,225
Weighted-average employee purchase price (in dollars per share)	$ 20.68	$ 25.39	$ 26.85

Lease Commitments - Lease Cost

Lease Commitments - Lease Cost Information Related to Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 5,738	$ 5,570
Variable lease cost	1,325	1,211
Short-term lease cost	497	715
Sublease income	(684)	(618)
Total lease cost	$ 6,876	$ 6,878

Lease Commitments - Supplementa

Lease Commitments - Supplemental Balance Sheet and Cash Flow Information Related to Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 25,538	$ 26,165
Operating lease liabilities	28,959	30,098
Cash paid for amounts included in the measurement of operating lease liabilities	6,035	5,936
Right-of-use assets obtained in exchange for new operating lease obligations	2,095	1,224
Right-of-use assets obtained through bank acquisition	$ 2,343	$ 0
Weighted average remaining lease term for operating leases	8 years 6 months	8 years 6 months
Weighted average discount rate for operating leases	4.62%	4.70%
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities	us-gaap:OtherLiabilities

Lease Commitments - Maturities

Lease Commitments - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2021	$ 5,865
2022	5,020
2023	3,849
2024	3,855
2025	3,525
Thereafter	12,075
Total undiscounted cash flows	34,189
Less: Net present value adjustment	(5,230)
Total	$ 28,959	$ 30,098

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax Expense Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
Federal	$ 21,688	$ 20,954	$ 9,078
State	4,471	1,932	0
Deferred
Federal	(2,697)	2,808	7,018
State	(644)	4,179	4,163
Total income tax provision	$ 22,818	$ 29,873	$ 20,259

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Expected Tax Benefit with Pretax Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax rate applied to income before income taxes	$ 21,122	$ 27,008	$ 18,381
Increase (decrease) resulting from the effects of:
Tax law change	(375)	0	0
Nondeductible acquisition costs	199	125	207
Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance	(1,110)	(1,282)	(667)
State income taxes	(804)	(1,283)	(874)
Tax credit investments	(72)	(72)	(33)
Stock compensation	(111)	(698)	(918)
Other	142	(36)	0
Federal tax provision	18,991	23,762	16,096
State tax provision	3,827	6,111	4,163
Total income tax provision	$ 22,818	$ 29,873	$ 20,259

Income Taxes - Summary of Net D

Income Taxes - Summary of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets, Gross [Abstract]
Allowance for credit losses	$ 24,158	$ 8,949
Other real estate owned	422	8
Accrued stock compensation	1,973	2,406
Federal tax loss carryforward	2,857	3,601
State tax loss carryforward	1,333	1,110
Alternative minimum tax credit carryforward	0	530
Lease liabilities	7,101	7,381
Deferred compensation	2,565	2,458
Accrued interest and fee income	995	3,106
Other	38	378
Gross deferred tax assets	41,442	29,927
Less: Valuation allowance	0	0
Deferred tax assets net of valuation allowance	41,442	29,927
Deferred Tax Liabilities, Gross [Abstract]
Core deposit base intangible	(3,234)	(4,005)
Net unrealized securities gains	(5,890)	(1,210)
Premises and equipment	(534)	(114)
Right of use assets	(6,262)	(6,416)
Other	(1,893)	(1,725)
Gross deferred tax liabilities	(17,813)	(13,470)
Net deferred tax assets	$ 23,629	$ 16,457

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Unrealized gains resulting in a deferred tax liability		$ 26,300,000	$ 5,700,000
Deferred tax liability from unrealized gains on certain investments in debt securities		5,890,000	1,210,000
Net deferred tax assets		23,629,000	16,457,000
Deferred tax assets		23,629,000	16,457,000
Accrual for income tax interest or penalties		0
Income tax benefit related to share-based compensation		100,000	800,000	$ 1,100,000
Amortization reflected as income expense related to affordable housing project investments		900,000	900,000	1,000,000
Affordable housing project tax credits		800,000	800,000	800,000
Affordable housing project tax benefits		200,000	200,000	200,000
Carrying value of affordable housing tax credits		16,400,000	7,400,000
Affordable housing tax credits, unfunded amounts		9,900,000	500,000
Unrecognized income tax benefits		0
Tax rate applied to income before income taxes		21,122,000	27,008,000	18,381,000
Income tax credit and deferred tax asset related to adoption of CECL		5,500,000
Income tax benefit from CARES act		375,000	0	$ 0
U.S. Federal
Operating Loss Carryforwards [Line Items]
Net deferred tax assets		18,000,000
Deferred tax assets		2,900,000
State
Operating Loss Carryforwards [Line Items]
Net deferred tax assets		5,600,000
Deferred tax assets		$ 1,300,000
Tax rate applied to income before income taxes	$ 1,100,000		$ (400,000)

Noninterest Income and Expens_3

Noninterest Income and Expenses - Summary of Noninterest Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income
Interchange income	$ 13,711	$ 13,399	$ 12,335
Marine finance fees	690	1,054	1,398
SBA gains	685	2,472	2,474
BOLI income	3,561	3,674	4,291
Other income	10,056	10,545	8,352
Noninterest Income	60,335	55,515	50,645
Securities gains (losses), net	1,235	1,217	(623)
Total Noninterest Income	61,570	56,732	50,022
Noninterest Expenses
Salaries and wages	88,539	73,829	71,111
Employee benefits	15,544	13,697	12,945
Outsourced data processing costs	19,053	15,077	16,374
Telephone and data lines	2,984	2,958	2,481
Occupancy	14,150	14,284	13,394
Furniture and equipment	5,874	6,245	6,744
Marketing	4,833	4,161	5,085
Legal and professional fees	9,167	8,553	9,961
FDIC assessments	1,268	881	2,195
Amortization of intangibles	5,857	5,826	4,300
Foreclosed property expense and net loss on sale	2,263	51	461
Provision for credit losses on unfunded commitments	185	0	0
Other	15,835	15,177	17,222
Total Noninterest Expenses	185,552	160,739	162,273
Service charges on deposit accounts
Income
Revenues	9,429	11,529	11,198
Wealth management income
Income
Revenues	7,507	6,352	5,915
Mortgage banking fees
Income
Revenues	$ 14,696	$ 6,490	$ 4,682

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Required Regulatory Capital (Details) $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Parent Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital Ratio (to risk-weighted assets), Amount	$ 1,029,455	$ 860,934
Tier 1 Capital (to risk-weighted assets), Amount	970,594	825,640
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	899,225	754,555
Leverage (to adjusted average assets), Amount	$ 970,594	$ 825,640
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	0.1851	0.1571
Tier 1 Capital (to risk-weighted assets), Ratio	0.1746	0.1506
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	16.17%	13.77%
Leverage (to adjusted average assets), Ratio	0.1192	0.1220
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 444,839	$ 438,506
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	333,629	328,880
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	250,222	246,660
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 325,690	$ 270,788
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0800	0.0800
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0600	0.0600
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	0.0400	0.0400
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	$ 956,592	$ 804,058
Tier 1 Capital (to risk-weighted assets), Amount	897,731	768,764
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	897,727	768,764
Leverage (to adjusted average assets), Amount	$ 897,731	$ 768,764
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	0.1721	0.1468
Tier 1 Capital (to risk-weighted assets), Ratio	0.1615	0.1404
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	16.15%	14.04%
Leverage (to adjusted average assets), Ratio	0.1103	0.1138
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 444,617	$ 437,952
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	333,463	328,464
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	250,097	246,348
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 325,523	$ 270,230
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0800	0.0800
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0600	0.0600
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	0.0400	0.0400
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 555,772	$ 547,440
Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	444,617	437,952
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	361,252	355,836
Leverage (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 406,904	$ 337,787
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.1000	0.1000
Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.0800	0.0800
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	0.0500	0.0500

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer rate	2.50%
Shares issued from treasury stock (in shares)	0	0
Number of shares authorized for repurchase (in shares)	100,000,000
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, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Total Assets	$ 8,342,392	$ 7,108,511
Liabilities and Shareholders' Equity
Subordinated debt	71,365	71,085
Shareholders' equity	1,130,402	985,639	$ 864,267	$ 689,664
Total Liabilities & Shareholders' Equity	8,342,392	7,108,511
Parent Company
Assets
Cash	70	70
Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days	70,074	52,979
Investment in subsidiaries	1,134,536	1,005,756
Other assets	659	1,515
Total Assets	1,205,339	1,060,320
Liabilities and Shareholders' Equity
Subordinated debt	71,365	71,085
Other liabilities	3,676	3,700
Shareholders' equity	1,130,298	985,535
Total Liabilities & Shareholders' Equity	$ 1,205,339	$ 1,060,320

Seacoast Banking Corporation _4

Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Summary of Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income
Total Interest Income	$ 287,035	$ 289,823	$ 241,398
Interest expense	24,292	46,205	29,883
Other expenses	15,835	15,177	17,222
Income tax benefit	22,818	29,873	20,259
Net Income	77,764	98,739	67,275
Parent Company
Income
Interest/other	270	679	484
Dividends from subsidiary Bank	0	0	0
Total Interest Income	270	679	484
Interest expense	2,236	3,368	3,165
Other expenses	838	651	879
Total expenses	3,074	4,019	4,044
Loss before income taxes and equity in undistributed income of subsidiaries	(2,804)	(3,340)	(3,560)
Income tax benefit	(589)	(702)	(747)
Loss before equity in undistributed income of subsidiaries	(2,215)	(2,638)	(2,813)
Equity in undistributed income of subsidiaries	79,979	101,377	70,088
Net Income	$ 77,764	$ 98,739	$ 67,275

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	$ 77,764	$ 98,739	$ 67,275
Net (increase) decrease in other assets	(35,555)	(5,614)	10,331
Net increase (decrease) in other liabilities	18,776	(4,206)	8,827
Net Cash Provided by Operating Activities	60,652	117,745	129,608
Cash Flows From Investing Activities
Net Cash Used in Investing Activities	(342,502)	(321,341)	(174,600)
Cash Flows From Financing Activities
Stock based employee benefit plans	(1,486)	(2,135)
Stock based employee benefit plans			979
Net Cash Provided by Financing Activities	561,407	212,176	51,439
Net increase in cash and cash equivalents	279,557	8,580	6,447
Cash and Cash Equivalents at Beginning of Year	124,531	115,951	109,504
Cash and Cash Equivalents at End of Year	404,088	124,531	115,951
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	23,548	46,130	28,301
Parent Company
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	77,764	98,739	67,275
Equity in undistributed income of subsidiaries	(79,979)	(101,377)	(70,088)
Net (increase) decrease in other assets	1,772	(738)	(10,045)
Net increase (decrease) in other liabilities	256	265	(3,431)
Net Cash Provided by Operating Activities	(187)	(3,111)	(16,289)
Cash Flows From Investing Activities
Net cash paid for bank acquisition	(1,462)	0	(6,558)
Investment in unconsolidated subsidiary	0	(10)	0
Proceeds from sale of Visa Class B stock	0	0	21,333
Dividends from bank subsidiary	20,230	18,082	0
Increase in securities purchased under agreement to resell, maturing within 30 days, net	(17,095)	(12,849)	(421)
Net Cash Used in Investing Activities	1,673	5,223	14,354
Cash Flows From Financing Activities
Stock based employee benefit plans	(1,486)	(2,239)
Stock based employee benefit plans			978
Net Cash Provided by Financing Activities	(1,486)	(2,239)	978
Net increase in cash and cash equivalents	0	(127)	(957)
Cash and Cash Equivalents at Beginning of Year	70	197	1,154
Cash and Cash Equivalents at End of Year	70	70	197
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	$ 1,992	$ 3,186	$ 2,936

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, 2020	Dec. 31, 2019
Contract or Notional Amount
Commitments to extend credit	$ 1,548,482	$ 1,018,020
Unfunded limited partner equity commitment	21,390	6,011
Secured
Contract or Notional Amount
Standby letters of credit and financial guarantees written	11,167	13,073
Unsecured
Contract or Notional Amount
Standby letters of credit and financial guarantees written	$ 1,197	$ 663

Contingent Liabilities and Co_4

Contingent Liabilities and Commitments with Off-Balance Sheet Risk - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitment to extend credit amount	$ 1,548,482	$ 1,018,020
Unfunded limited partner equity commitment	21,390	6,011
Secured
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Collateral held for secured standby letters of credit	$ 12,400	$ 13,200

Fair Value - Fair Value Measure

Fair Value - Fair Value Measurements for Items Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial Assets
Available-for-sale debt securities	$ 1,398,157	$ 946,855
Loans held for sale	68,890	20,029
Other real estate owned	12,750	12,390
Fair Value, Measurements, Recurring
Financial Assets
Available-for-sale debt securities	1,398,157	946,855
Derivative financial instruments	14,343
Loans held for sale	68,890	20,029
Equity securities	6,530	6,392
Financial Liabilities
Derivative financial instruments	13,339
Fair Value, Measurements, Recurring | Level 1
Financial Assets
Available-for-sale debt securities	101	100
Derivative financial instruments	0
Loans held for sale	0	0
Equity securities	6,530	6,392
Financial Liabilities
Derivative financial instruments	0
Fair Value, Measurements, Recurring | Level 2
Financial Assets
Available-for-sale debt securities	1,398,056	946,755
Derivative financial instruments	14,343
Loans held for sale	68,890	20,029
Equity securities	0	0
Financial Liabilities
Derivative financial instruments	13,339
Fair Value, Measurements, Recurring | Level 3
Financial Assets
Available-for-sale debt securities	0	0
Derivative financial instruments	0
Loans held for sale	0	0
Equity securities	0	0
Financial Liabilities
Derivative financial instruments	0
Fair Value, Measurements, Nonrecurring
Financial Assets
Loans	8,806	5,123
Other real estate owned	12,750	12,390
Fair Value, Measurements, Nonrecurring | Level 1
Financial Assets
Loans	0	0
Other real estate owned	0	0
Fair Value, Measurements, Nonrecurring | Level 2
Financial Assets
Loans	1,900	1,419
Other real estate owned	72	241
Fair Value, Measurements, Nonrecurring | Level 3
Financial Assets
Loans	6,906	3,704
Other real estate owned	$ 12,678	$ 12,149

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, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Aggregate fair value	$ 68,890	$ 20,029
Contractual balance	66,415	19,445
Excess	$ 2,475	$ 584

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Average capitalization rate	7.30%
Specific reserve for impaired loans	$ 92,733	$ 35,154	$ 32,423	$ 27,122
Additions to level 3, loans	11,900
Paydowns and chargeoffs to level 3, loans	(8,700)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned and other reductions classified as level 3 transfers in	4,500
Other real estate owned, sales of level 3 investments	4,900
Other real estate owned, paydowns, chargeoffs and writedowns of level 3	1,600
Other real estate owned, additions to level 3	2,600
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired loans	8,800	5,100
Specific reserve for impaired loans	$ 7,700	$ 2,900

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, 2020	Dec. 31, 2019
Financial Assets
Held-to-maturity debt securities	$ 184,484	$ 261,369
Loans, net	5,642,616	5,163,250
Level 1
Financial Assets
Held-to-maturity debt securities	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
Subordinated debt	0	0
Level 2
Financial Assets
Held-to-maturity debt securities	192,179	262,213
Time deposits with other banks	762	0
Loans, net	0	0
Financial Liabilities
Deposits	0	0
Federal Home Loan Bank (FHLB) borrowings		0
Subordinated debt	58,227	64,017
Level 3
Financial Assets
Held-to-maturity debt securities	0	0
Time deposits with other banks	0	3,744
Loans, net	5,686,019	5,139,491
Financial Liabilities
Deposits	6,936,097	5,584,621
Federal Home Loan Bank (FHLB) borrowings		314,995
Subordinated debt	0	0
Carrying Amount
Financial Assets
Held-to-maturity debt securities	184,484	261,369
Time deposits with other banks	750	3,742
Loans, net	5,633,810	5,158,127
Financial Liabilities
Deposits	6,932,561	5,584,753
Federal Home Loan Bank (FHLB) borrowings		315,000
Subordinated debt	$ 71,365	$ 71,085

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Shares excluded from computation of diluted EPS (in shares)	508	491	483
Basic earnings per share
Net Income	$ 77,764	$ 98,739	$ 67,275
Total weighted average common stock outstanding (in shares)	53,502	51,449	47,969
Net income per share (in dollars per share)	$ 1.45	$ 1.92	$ 1.40
Diluted earnings per share
Net Income	$ 77,764	$ 98,739	$ 67,275
Total weighted average common stock outstanding (in shares)	53,502	51,449	47,969
Add: Dilutive effect of employee restricted stock and stock options (in shares)	428	580	779
Total weighted average diluted stock outstanding (in shares)	53,930	52,029	48,748
Net income per share (in dollars per share)	$ 1.44	$ 1.90	$ 1.38

Business Combinations - Additio

Business Combinations - Additional Information (Details) $ in Thousands	Aug. 21, 2020USD ($)branch	Mar. 13, 2020USD ($)branch	Oct. 19, 2018USD ($)branch	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Acquisition costs				$ (9,100)	$ (1,000)	$ (9,700)
Fourth Street Banking Company
Business Acquisition [Line Items]
Number of branches acquired | branch	2
Percentage of common stock acquired	100.00%
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)	0.1275
Goodwill, nondeductible for tax purposes	$ 9,000
First Bank of The Palm Beaches
Business Acquisition [Line Items]
Number of branches operated | branch		2
Percentage of common stock acquired		100.00%
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)		0.2000
Goodwill, nondeductible for tax purposes		$ 6,900
First Green Bancorp, Inc.
Business Acquisition [Line Items]
Number of branches operated | 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
Goodwill, nondeductible for tax purposes			$ 56,700

Business Combinations - Purchas

Business Combinations - Purchase Price (Details) $ / shares in Units, $ in Thousands	Aug. 21, 2020USD ($)$ / sharesshares	Mar. 13, 2020USD ($)$ / sharesshares	Oct. 19, 2018USD ($)$ / sharesshares
Fourth Street Banking Company
Business Acquisition [Line Items]
Number of shares outstanding (in shares) | shares	11,220,000
Shares issued upon conversion of convertible debt (in shares) | shares	5,405,000
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)	0.1275
Number of shares of common stock issued (in shares) | shares	2,120,000
Multiplied by common stock price per share (in dollars per share) | $ / shares	$ 19.40
Value of common stock issued	$ 41,121
Cash paid for vested Corporation stock options	596
Total purchase price	$ 41,717
First Bank of The Palm Beaches
Business Acquisition [Line Items]
Number of shares outstanding (in shares) | shares		5,213,000
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)		0.2000
Number of shares of common stock issued (in shares) | shares		1,043,000
Multiplied by common stock price per share (in dollars per share) | $ / shares		$ 20.17
Value of common stock issued		$ 21,031
Cash paid for vested Corporation stock options		866
Total purchase price		$ 21,897
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, 2020	Aug. 21, 2020	Mar. 13, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 19, 2018	Dec. 31, 2017
Assets:
Goodwill	$ 221,176			$ 205,286	$ 204,753		$ 147,578
First Bank of The Palm Beaches
Assets:
Cash			$ 34,749
Investment securities			447
Loans			146,777
Bank premises and equipment			6,086
Core deposit intangibles			819
Goodwill			6,861
Other assets			1,305
Total assets			197,044
Liabilities:
Deposits			173,741
Other liabilities			1,406
Total liabilities			175,147
First Green Bancorp, Inc.
Assets:
Cash						$ 29,434
Investment securities						32,145
Loans						631,497
Bank premises and equipment						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 Measured | Fourth Street Banking Company
Assets:
Cash		$ 38,082
Investment securities		3,498
Loans		303,434
Bank premises and equipment		9,480
Core deposit intangibles		1,310
Goodwill		9,030
Other assets		7,088
Total assets		371,922
Liabilities:
Deposits		329,662
Other liabilities		543
Total liabilities		$ 330,205
Initially Measured | First Bank of The Palm Beaches
Assets:
Cash			34,749
Investment securities			447
Loans			146,839
Bank premises and equipment			6,086
Core deposit intangibles			819
Goodwill			6,799
Other assets			1,285
Total assets			197,024
Liabilities:
Deposits			173,741
Other liabilities			1,386
Total liabilities			175,127
Initially Measured | First Green Bancorp, Inc.
Assets:
Cash						29,434
Investment securities						32,145
Loans						631,497
Bank premises and equipment						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
Measurement Period Adjustments | First Bank of The Palm Beaches
Assets:
Cash			0
Investment securities			0
Loans			(62)
Bank premises and equipment			0
Core deposit intangibles			0
Goodwill			62
Other assets			20
Total assets			20
Liabilities:
Deposits			0
Other liabilities			20
Total liabilities			$ 20
Measurement Period Adjustments | First Green Bancorp, Inc.
Assets:
Cash						0
Investment securities						0
Loans						0
Bank premises and equipment						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

Business Combinations - Fair _2

Business Combinations - Fair Value of Acquired Loans (Details) - USD ($) $ in Thousands	Aug. 21, 2020	Mar. 13, 2020	Oct. 19, 2018
Fourth Street Banking Company
Business Acquisition [Line Items]
Book Balance	$ 317,193
Fair Value	303,434
Fourth Street Banking Company | Construction and land development
Business Acquisition [Line Items]
Book Balance	9,197
Fair Value	8,851
Fourth Street Banking Company | Commercial real estate - owner occupied
Business Acquisition [Line Items]
Book Balance	77,936
Fair Value	75,215
Fourth Street Banking Company | Commercial real estate - non-owner occupied
Business Acquisition [Line Items]
Book Balance	76,014
Fair Value	71,171
Fourth Street Banking Company | Residential real estate
Business Acquisition [Line Items]
Book Balance	23,548
Fair Value	23,227
Fourth Street Banking Company | Commercial and financial
Business Acquisition [Line Items]
Book Balance	72,745
Fair Value	68,096
Fourth Street Banking Company | Consumer
Business Acquisition [Line Items]
Book Balance	2,748
Fair Value	2,694
Fourth Street Banking Company | PPP loans
Business Acquisition [Line Items]
Book Balance	55,005
Fair Value	$ 54,180
First Bank of The Palm Beaches
Business Acquisition [Line Items]
Book Balance		$ 150,342
Fair Value		146,777
First Bank of The Palm Beaches | Construction and land development
Business Acquisition [Line Items]
Book Balance		9,493
Fair Value		9,012
First Bank of The Palm Beaches | Commercial real estate - owner occupied
Business Acquisition [Line Items]
Book Balance		46,221
Fair Value		45,171
First Bank of The Palm Beaches | Commercial real estate - non-owner occupied
Business Acquisition [Line Items]
Book Balance		36,268
Fair Value		35,079
First Bank of The Palm Beaches | Residential real estate
Business Acquisition [Line Items]
Book Balance		47,569
Fair Value		47,043
First Bank of The Palm Beaches | Commercial and financial
Business Acquisition [Line Items]
Book Balance		9,659
Fair Value		9,388
First Bank of The Palm Beaches | Consumer
Business Acquisition [Line Items]
Book Balance		1,132
Fair Value		$ 1,084
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. | PCD 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	Aug. 21, 2020	Mar. 13, 2020	Oct. 19, 2018
Fourth Street Banking Company
Business Acquisition [Line Items]
Total purchased credit-impaired loan acquired	$ 303,434
Fourth Street Banking Company | PCD Loans
Business Acquisition [Line Items]
Book balance of loans at acquisition	59,455
Allowance for credit losses at acquisition	(5,763)
Non-credit related discount	(4,319)
Total purchased credit-impaired loan acquired	$ 49,373
First Bank of The Palm Beaches
Business Acquisition [Line Items]
Total purchased credit-impaired loan acquired		$ 146,777
First Bank of The Palm Beaches | PCD Loans
Business Acquisition [Line Items]
Book balance of loans at acquisition		43,682
Allowance for credit losses at acquisition		(516)
Non-credit related discount		(128)
Total purchased credit-impaired loan acquired		$ 43,038
First Green Bancorp, Inc.
Business Acquisition [Line Items]
Total purchased credit-impaired loan acquired			$ 631,497
First Green Bancorp, Inc. | PCD 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	Aug. 21, 2020	Mar. 13, 2020	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition, Pro Forma Information [Abstract]
Net interest income			$ 274,432	$ 266,033
Net income			$ 82,179	$ 100,718
EPS - basic (in dollars per share)			$ 1.60	$ 1.88
EPS - diluted (in dollars per share)			$ 1.59	$ 1.86
First Bank of The Palm Beaches
Business Acquisition, Pro Forma Information [Abstract]
Provision for credit losses excluded from pro-forma information		$ 1,800
Fourth Street Banking Company
Business Acquisition, Pro Forma Information [Abstract]
Provision for credit losses excluded from pro-forma information	$ 4,600