Seacoast Banking Corporation of Florida (SBCF) 10-K 25 Feb 22 2021 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2021	Jan. 31, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
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			$ 1,893,140,629
Entity Common Stock, Shares Outstanding		61,198,780
Documents Incorporated by Reference	Certain portions of the registrant’s Proxy Statement for the 2022 Annual Meeting of Shareholders (the “2022 Proxy Statement”) are incorporated by reference into Part III, Items 10 through 14 of this report. Other than those portions of the 2022 Proxy Statement specifically incorporated by reference herein pursuant to Items 10 through 14, no other portions of the 2022 Proxy Statement shall be deemed so incorporated.
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0000730708

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2021
Audit Information [Abstract]
Auditor Name	Crowe LLP
Auditor Location	Fort Lauderdale, Florida
Auditor Firm ID	173

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest and dividends on securities
Taxable	$ 29,206	$ 29,718	$ 35,354
Nontaxable	577	454	555
Interest and fees on loans	251,471	254,366	250,535
Interest on interest bearing deposits and other investments	2,990	2,497	3,379
Total Interest Income	284,244	287,035	289,823
Interest Expense
Interest on deposits	3,605	6,920	16,621
Interest on time certificates	2,788	13,365	21,776
Interest on securities sold under agreement to repurchase	141	283	1,431
Interest on Federal Home Loan Bank (“FHLB”) borrowings	0	1,540	3,010
Interest on subordinated debt	1,685	2,184	3,367
Total Interest Expense	8,219	24,292	46,205
Net Interest Income	276,025	262,743	243,618
Provision for credit losses	(9,421)	38,179	10,999
Net Interest Income After Provision for Credit Losses	285,446	224,564	232,619
Noninterest Income:
Service charges on deposit accounts	9,777	9,429	11,529
Interchange income	16,231	13,711	13,399
Wealth management income	9,628	7,507	6,352
Mortgage banking fees	11,782	14,696	6,490
Marine finance fees	665	690	1,053
SBA gains	1,531	685	2,472
BOLI income	4,154	3,561	3,674
SBIC income	6,778	1,373	904
Other	10,759	8,683	9,642
Noninterest income, excluding securities gains (losses)	71,305	60,335	55,515
Securities (losses) gains, net (includes net gains of $2.2 million for 2021, net gains of $0.2 million for 2020 and net gains of $6.2 million for 2019 in other comprehensive income reclassifications)	(578)	1,235	1,217
Total Noninterest Income	70,727	61,570	56,732
Noninterest Expense:
Salaries and wages	97,283	88,539	73,829
Employee benefits	17,873	15,544	13,697
Outsourced data processing costs	19,919	19,053	15,077
Telephone / data lines	3,223	2,984	2,958
Occupancy	14,140	14,150	14,284
Furniture and equipment	5,390	5,874	6,245
Marketing	4,583	4,833	4,161
Legal and professional fees	11,376	9,167	8,553
FDIC assessments	2,405	1,268	881
Amortization of intangibles	5,033	5,857	5,826
Foreclosed property expense and net (gain) loss on sale	(264)	2,263	51
Provision for credit losses on unfunded commitments	133	185	0
Other	16,341	15,835	15,177
Total Noninterest Expense	197,435	185,552	160,739
Income Before Income Taxes	158,738	100,582	128,612
Income taxes	34,335	22,818	29,873
Net Income	$ 124,403	$ 77,764	$ 98,739
Net income per share of common stock
Diluted (in dollars per share)	$ 2.18	$ 1.44	$ 1.90
Basic (in dollars per share)	$ 2.20	$ 1.45	$ 1.92
Average common shares outstanding
Diluted (in shares)	57,088	53,930	52,029
Basic (in shares)	56,586	53,502	51,449

CONSOLIDATED STATEMENTS OF IN_2

CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Gains included in other comprehensive income reclassifications	$ 2.2	$ 0.2	$ 6.2

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 124,403	$ 77,764	$ 98,739
Available-for-sale securities:
Unrealized (losses) gains on available-for-sale securities, net of tax benefit of $8.2 million in 2021, tax expense of $5.0 million in 2020 and tax expense of $5.9 million in 2019	(27,377)	16,628	19,016
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	0	(730)
Amortization of unrealized losses on securities transferred to held-to-maturity, net of tax expense of $21 thousand, $40 thousand, and $87 thousand, respectively	86	184	175
Reclassification adjustment for losses (gains) included in net income, net of tax benefit of $85 thousand in 2021, tax expense of $314 thousand in 2020 and tax expense of $95 thousand in 2019	278	(782)	(936)
Available-for-sale securities, net of tax	(27,013)	16,030	17,525
Unrealized losses on derivatives designated as cash flow hedges, net of reclassifications to income, net of tax expense of $120 thousand in 2021 and tax expense of $42 thousand in 2020	(351)	(125)	0
Total other comprehensive income (loss)	(27,364)	15,905	17,525
Comprehensive Income	$ 97,039	$ 93,669	$ 116,264

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Unrealized (losses) gains on available-for-sale securities, tax (benefit) expense	$ (8,200)	$ 5,000	$ 5,900
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	21	40	87
Reclassification adjustment for losses (gains) included in net income, tax (benefit) expense	(85)	314	$ 95
Unrealized losses on cash flow hedging derivatives, net of reclassifications, tax expense	$ 120	$ 42

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 238,750	$ 86,630
Interest bearing deposits with other banks	498,979	317,458
Total cash and cash equivalents	737,729	404,088
Time deposits with other banks	0	750
Securities available-for-sale (at fair value)	1,644,319	1,398,157
Securities held-to-maturity (fair value $627.4 million in 2021 and $192.2 million in 2020)	638,640	184,484
Total debt securities	2,282,959	1,582,641
Loans held for sale (at fair value)	31,791	68,890
Loans	5,925,029	5,735,349
Less: Allowance for credit losses	(83,315)	(92,733)
Loans, net of allowance for credit losses	5,841,714	5,642,616
Bank premises and equipment, net	72,404	75,117
Other real estate owned	13,618	12,750
Goodwill	252,154	221,176
Other intangible assets, net	14,845	16,745
Bank owned life insurance	205,041	131,776
Net deferred tax assets	27,321	23,629
Other assets	201,857	162,214
Total Assets	9,681,433	8,342,392
Deposits
Noninterest demand	3,075,534	2,289,787
Interest-bearing demand	1,890,212	1,566,069
Savings	895,019	689,179
Money market	1,651,881	1,556,370
Other time deposits	404,601	425,878
Brokered time certificates	0	233,815
Time certificates of more than $250,000	150,342	171,463
Total Deposits	8,067,589	6,932,561
Securities sold under agreements to repurchase, maturing within 30 days	121,565	119,609
Subordinated debt	71,646	71,365
Other liabilities	109,897	88,455
Total Liabilities	8,370,697	7,211,990
Commitments and Contingencies (See “Note 9 - Borrowings” and “Note 15 - 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 58,909,369 and outstanding 58,504,250 shares in 2021 and authorized 120,000,000 shares, issued 55,584,979 and outstanding 55,243,226 shares in 2020	5,850	5,524
Additional paid-in capital	963,851	856,092
Retained earnings	358,598	256,701
Less: Treasury stock (405,119 shares in 2021 and 341,753 shares in 2020), at cost	(10,569)	(8,285)
Total shareholders' equity, before accumulated other comprehensive income (loss), net	1,317,730	1,110,032
Accumulated other comprehensive (loss) income, net	(6,994)	20,370
Total Shareholders' Equity	1,310,736	1,130,402
Total Liabilities & Shareholders' Equity	$ 9,681,433	$ 8,342,392

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Held for investment, fair value, total	$ 627,398	$ 192,179
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)	58,909,369	55,584,979
Common stock, shares outstanding (in shares)	58,504,250	55,243,226
Treasury stock (in shares)	405,119	341,753

CONSOLIDATED STATEMENT OF CASH

CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows From Operating Activities
Net Income	$ 124,403	$ 77,764	$ 98,739
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	5,482	6,020	6,421
Amortization of premiums and discounts on securities, net	6,220	5,019	2,548
Amortization of operating lease right-of-use assets	4,576	4,362	4,117
Other amortization and accretion, net	(13,908)	(8,667)	(2,005)
Stock based compensation	8,685	7,304	7,243
Origination of loans designated for sale	(490,426)	(511,706)	(329,177)
Sale of loans designated for sale	543,410	477,178	333,591
Provision for credit losses	(9,421)	38,179	10,999
Deferred income taxes	3,836	(4,926)	6,791
Losses (gains) on sale of securities	363	(1,096)	(1,031)
Gains on sale of loans	(15,276)	(13,930)	(9,794)
(Gains) losses on sale and write-downs of other real estate owned	(635)	1,139	(432)
Losses on disposition of fixed assets	817	791	511
Bank owned life insurance death benefits	0	0	(956)
Changes in operating assets and liabilities, net of effects from acquired companies:
Net increase in other assets	(42,437)	(35,555)	(5,614)
Net increase (decrease) in other liabilities	28,883	18,776	(4,206)
Net Cash Provided by Operating Activities	154,572	60,652	117,745
Cash Flows From Investing Activities
Maturities and repayments of available-for-sale debt securities	546,339	304,064	101,674
Maturities and repayments of held-to-maturity debt securities	132,916	75,861	42,495
Proceeds from sale of available-for-sale debt securities	84,972	96,732	202,724
Purchases of available-for-sale debt securities	(1,145,193)	(830,300)	(309,461)
Purchases of held-to-maturity debt securities	(377,159)	0	0
Maturities of time deposits with other banks	750	2,992	4,501
Net new loans and principal repayments	566,348	(79,100)	(109,614)
Purchases of loans held for investment	(259,267)	0	(270,791)
Proceeds from the sale of other real estate owned	5,598	8,521	6,509
Additions to other real estate owned	(2,513)	(2,557)	0
Proceeds from sale of FHLB and Federal Reserve Bank Stock	3,945	39,185	74,120
Purchase of FHLB and Federal Reserve Bank Stock	(3,020)	(28,278)	(75,193)
Redemption of bank owned life insurance	0	0	14,218
Net cash from bank acquisitions	98,100	71,965	0
Purchase of bank owned life insurance	(60,000)	0	0
Additions to bank premises and equipment	(4,327)	(1,587)	(2,523)
Net Cash Used in Investing Activities	(412,511)	(342,502)	(321,341)
Cash Flows From Financing Activities
Net increase in deposits	640,108	844,405	407,513
Net increase (decrease) in repurchase agreements	1,956	33,488	(128,202)
Net decrease in FHLB borrowings with original maturities of three months or less	0	(235,000)	(67,000)
Repayments of FHLB borrowings with original maturities of more than three months	(33,000)	(115,000)	(63,000)
Proceeds from FHLB borrowings with original maturities of more than three months	0	35,000	65,000
Stock based employee benefit plans	5,022
Stock based employee benefit plans		(1,486)	(2,135)
Dividends paid	(22,506)	0	0
Net Cash Provided by Financing Activities	591,580	561,407	212,176
Net increase in cash and cash equivalents	333,641	279,557	8,580
Cash and Cash Equivalents at Beginning of Year	404,088	124,531	115,951
Cash and Cash Equivalents at End of Year	737,729	404,088	124,531
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	9,977	23,548	46,130
Cash paid during the period for taxes	30,887	27,712	16,000
Recognition of operating lease right-of-use assets, other than through bank acquisition	12,459	2,095	30,301
Recognition of operating lease liabilities, other than through bank acquisition	12,459	2,095	34,627
Supplemental disclosure of non-cash investing activities:
Transfer of debt securities from available-for-sale to held-to-maturity	210,805	0	0
Transfer of debt securities from held-to-maturity to available-for-sale	0	0	52,796
Unsettled sales of debt securities available-for-sale	17,147	0	0
Transfer from loans to other real estate owned	0	5,624	5,665
Transfer from bank premises to other real estate owned	3,318	1,289	0
Transfer from loans held for investment to loans held for sale	$ 0	$ 0	$ 801

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative change in accounting principle upon adoption of new accounting pronouncement	Common Stock	Paid-in Capital	Retained Earnings	Retained EarningsCumulative change in accounting principle upon adoption of new accounting pronouncement	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2018			51,361
Beginning balance at Dec. 31, 2018	$ 864,267		$ 5,136	$ 778,501	$ 97,074		$ (3,384)	$ (13,060)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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, pursuant to acquisition (in shares)			3,163
Issuance of common stock, pursuant to acquisition	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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	97,039				124,403			(27,364)
Stock based compensation expense (in shares)			23
Stock based compensation expense	8,685			8,685
Common stock issued for stock based employee benefit plans (in shares)			167
Common stock issued for stock based employee benefit plans	(2,314)		$ 19	(49)			(2,284)
Common stock issued for stock options (in shares)			384
Common stock issued for stock options	7,336		$ 38	7,298
Issuance of common stock, pursuant to acquisition (in shares)			2,687
Issuance of common stock, pursuant to acquisition	86,487		$ 269	86,218
Conversion of options, pursuant to acquisition	5,607			5,607
Dividends on common stock ($0.39 per share)	(22,506)				(22,506)
Ending balance (in shares) at Dec. 31, 2021			58,504
Ending balance at Dec. 31, 2021	$ 1,310,736		$ 5,850	$ 963,851	$ 358,598		$ (10,569)	$ (6,994)

CONSOLIDATED STATEMENTS OF SH_2

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical)	12 Months Ended
	Dec. 31, 2021$ / shares
Statement of Stockholders' Equity [Abstract]
Dividends on common stock (in dollars per share)	$ 0.39

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
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 consumer banking, wealth management, mortgage services to customers at more than 50 full-service branches across Florida, and through advanced mobile and online banking solutions. 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. 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. Credit losses on securities: For securities classified as held-to-maturity, management must estimate expected credit losses over the remaining expected life and recognize this estimate as an allowance for credit losses. Debt securities that are available-for-sale are analyzed quarterly for credit losses. The analysis is performed on an individual security basis for all securities where fair value has declined below amortized cost. Fair value is based upon pricing obtained from third party pricing services. However, on occasion pricing provided by the pricing services may not be consistent with other observed prices in the market for similar securities. Using observable market factors, including interest rate and yield curves, volatilities, prepayment speeds, loss severities and default rates, the Company may at times validate the observed prices using a discounted cash flow model and using the observed prices for similar securities to determine the fair value of its securities. Both quantitative and qualitative assessments are utilized to determine if a security has a credit loss. Quantitative assessments are based on a discounted cash flow method. Qualitative assessments consider a range of factors including: percent decline in fair value, rating downgrades, subordination, duration, amortized loan-to-value, and the ability of the issuers to pay all amounts due in accordance with the contractual terms. 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 and effective through 2021, rules defined in the Coronavirus Aid, Relief and Economic Security (“CARES”) Act and a joint statement issued by federal regulators in consultation with FASB provided 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. Allowance for credit losses on loans: On January 1, 2020, the Company adopted Accounting Standards Codification No. 326, Financial Instruments - Credit Losses (ASC 326), which replaced the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss ("CECL") methodology. 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 January 1, 2020 are presented under ASC Topic 326, while prior amounts continue to be reported in accordance with previously applicable GAAP. 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 ("PCD"). Acquired loans which do not meet the definition of PCD are classified by the Company as acquired Non-PCD. The Company estimates the allowance for credit losses on loans 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. The allowance for credit losses is measured on a collective basis when similar risk characteristics exist. 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. 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 Accumulated Other Comprehensive Income (“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 6 – 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, other real estate owned, 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 the fair value of the premises is less than amortized book value, a write down is recorded through noninterest expense. Costs to maintain the property 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. Other Investments: Included in Other Assets are investments in funds generating affordable housing tax credits, and investments in Small Business Investment Companies (“SBICs”), which are privately owned and operated companies licensed by the U.S. Small Business Administration (“SBA”) to invest in small businesses. Investments generating tax credits are accounted for using the “proportional amortization” method. Under this method, the investor amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits allocated to the investor. SBIC investments are held at cost less impairment, if any. Income from SBIC investments will vary amongst periods and is recognized in earnings. 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 recognized in earnings. 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 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	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share are computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during each period. Diluted earnings per share are based on the weighted-average number of common shares outstanding during each period, plus common share equivalents calculated for stock options and performance restricted stock outstanding using the treasury stock method. In 2021 no options to purchase shares of the Company's common stock were antidilutive. In 2020 and 2019, options to purchase 508,000, and 491,000 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) 2021 2020 2019 Basic earnings per share Net Income $ 124,403 $ 77,764 $ 98,739 Total weighted average common stock outstanding 56,586 53,502 51,449 Net income per share $ 2.20 $ 1.45 $ 1.92 Diluted earnings per share Net Income $ 124,403 $ 77,764 $ 98,739 Total weighted average common stock outstanding 56,586 53,502 51,449 Add: Dilutive effect of employee restricted stock and stock options (See “Note 10 - Employee Benefits and Stock Compensation”) 502 428 580 Total weighted average diluted stock outstanding 57,088 53,930 52,029 Net income per share $ 2.18 $ 1.44 $ 1.90 Net income has not been allocated to unvested restricted stock awards that are participating securities because the amounts that would be allocated are not material to net income per share of common stock. Unvested restricted stock awards that are participating securities represent less than one percent of all of the outstanding shares of common stock for each of the periods presented.

Securities

Securities	12 Months Ended
	Dec. 31, 2021
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, 2021 and December 31, 2020 are summarized as follows: December 31, 2021 (In thousands) Amortized Gross Gross Fair Available-for-Sale Debt Securities U.S. Treasury securities and obligations of U.S. government agencies $ 6,466 $ 316 $ (3) $ 6,779 Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 1,234,721 8,308 (20,309) 1,222,720 Private mortgage-backed securities and collateralized mortgage obligations 88,096 1,091 (420) 88,767 Collateralized loan obligations 292,751 63 (124) 292,690 Obligations of state and political subdivisions 31,624 1,740 (1) 33,363 Totals $ 1,653,658 $ 11,518 $ (20,857) $ 1,644,319 Held-to-Maturity Debt Securities Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities $ 638,640 $ 3,828 $ (15,070) $ 627,398 Totals $ 638,640 $ 3,828 $ (15,070) $ 627,398 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 Debt securities with a fair value of $102.1 million were sold during 2021, with gross gains of $0.3 million and gross losses of $0.6 million. During 2020, debt securities with a fair value of $96.7 million were sold with gross gains of $2.4 million and gross losses of $1.3 million. Debt securities with a fair value of $202.7 million were sold during 2019, with gross gains of $2.9 million and gross losses of $1.8 million. Also included in “Securities gains (losses) net” is a decrease of $0.2 million in 2021 and increases of $0.1 million and $0.2 million in 2020 and 2019, respectively, in the value of an investment in shares of a mutual fund that invests in CRA-qualified debt securities. During the first quarter of 2021, the Company reclassified debt securities with an amortized cost of $210.8 million from available-for-sale to held-to-maturity, as it has the ability and intent to hold these securities to maturity. These securities had net unrealized gains of $0.8 million at the date of transfer, which will continue to be reported in accumulated other comprehensive income, and will be amortized over the remaining life of the securities as an adjustment of yield. The effect on interest income of the amortization of net unrealized gains is offset by the amortization of the premium on the securities transferred. At December 31, 2021, debt securities with a fair value of $421.4 million were pledged primarily as collateral for public deposits and secured borrowings. The amortized cost and fair value of securities at December 31, 2021, 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 $ — $ — $ 2,174 $ 2,210 Due after one year through five years — — 14,017 14,841 Due after five years through ten years — — 7,041 7,341 Due after ten years — — 14,858 15,750 — — 38,090 40,142 Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 638,640 627,398 1,234,721 1,222,720 Private mortgage-backed securities and collateralized mortgage obligations — — 88,096 88,767 Collateralized loan obligations — — 292,751 292,690 Totals $ 638,640 $ 627,398 $ 1,653,658 $ 1,644,319 The estimated fair value of a security is determined based on market quotations when available or, if not available, by using quoted market prices for similar securities, pricing models or discounted cash flows analyses, using observable market data where available. The tables below indicate the fair value of available-for-sale debt securities with unrealized losses for which no allowance for credit losses has been recorded. December 31, 2021 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 $ 97 $ (1) $ 245 $ (2) $ 342 $ (3) Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 955,881 (19,575) 11,953 (734) 967,834 (20,309) Private mortgage-backed securities and collateralized mortgage obligations 33,640 (173) 9,628 (247) 43,268 (420) Collateralized loan obligations 123,202 (81) 9,461 (43) 132,663 (124) Obligations of state and political subdivisions 499 (1) — — 499 (1) Totals $ 1,113,319 $ (19,831) $ 31,287 $ (1,026) $ 1,144,606 $ (20,857) 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) At December 31, 2021, the Company had unrealized losses of $20.3 million on mortgage-backed securities and collateralized mortgage obligations issued by government-sponsored entities having a fair value of $967.8 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, 2021, no allowance for credit losses has been recorded. At December 31, 2021, the Company had $0.4 million of unrealized losses on private label residential and commercial mortgage-backed securities and collateralized mortgage obligations having a fair value of $43.3 million. The collateral underlying these mortgage investments is primarily residential commercial real estate. The securities have average credit support of 23%. 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, 2021, no allowance for credit losses has been recorded. At December 31, 2021, the Company had $0.1 million of unrealized losses in uncapped 3-month LIBOR floating rate collateralized loan obligations (“CLOs”) having a fair value of $132.7 million. CLOs are special purpose vehicles and those in which the Company has invested acquire 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, 2021, all positions held by the Company are in AAA and AA tranches, with average credit support of 37% 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, 2021, 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. As a result, as of December 31, 2021, no allowance for credit losses has been recorded. Included in Other Assets at December 31, 2021 is $34.4 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 $3.4 million and $1.0 million, respectively, at December 31, 2021, and $3.2 million and $0.4 million, respectively, at December 31, 2020, is included in Other Assets. Also included in Other Assets is an investment in a CRA-qualified mutual fund carried at fair value of $9.3 million and $6.5 million at December 31, 2021 and December 31, 2020, respectively. The Company holds 11,330 shares of Visa Class B stock which, following resolution of Visa litigation, will be converted to Visa Class A shares. Under the current conversion ratio that became effective December 29, 2021, the Company would receive 1.6181 shares of Class A stock for each share of Class B stock for a total of 18,333 shares of Visa Class A stock. The ownership

Loans

Loans	12 Months Ended
	Dec. 31, 2021
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, non-farm residential property, and various commercial purpose properties 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 Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”), and extended by the Economic Aid 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. The following tables present net loan balances by segment as of: December 31, 2021 (In thousands) Portfolio Loans Acquired Non-PCD Loans PCD Loans Total Construction and land development $ 199,341 $ 31,438 $ 45 $ 230,824 Commercial real estate - owner occupied 983,517 186,812 27,445 1,197,774 Commercial real estate - non-owner occupied 1,278,180 382,554 75,705 1,736,439 Residential real estate 1,261,306 156,957 7,091 1,425,354 Commercial and financial 968,318 84,395 16,643 1,069,356 Consumer 169,507 4,658 10 174,175 Paycheck Protection Program 69,503 21,604 — 91,107 Totals $ 4,929,672 $ 868,418 $ 126,939 $ 5,925,029 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 The amortized cost basis of loans at December 31, 2021 included net deferred costs of $31.0 million on non-PPP portfolio loans and net deferred fees of $2.4 million on PPP loans. At December 31, 2020, the amortized cost basis 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, 2021, the remaining fair value adjustments on acquired loans were $23.1 million, or 2.3% of the outstanding acquired loan balances, compared to $30.2 million, or 2.9% of the acquired loan balances at December 31, 2020. 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 $14.7 million and $25.8 million at December 31, 2021 and December 31, 2020, respectively. Loans to directors and executive officers totaled $0.6 million and $1.1 million at December 31, 2021 and 2020, respectively. Two new loans were originated to directors or officers in 2021. The following table presents the status of net loan balances as of December 31, 2021 and December 31, 2020. Loans on short-term payment deferral at the reporting date are reported as current. December 31, 2021 (In thousands) Current Accruing Accruing Accruing Nonaccrual Total Portfolio Loans Construction and land development $ 199,087 $ — $ — $ — $ 254 $ 199,341 Commercial real estate - owner occupied 982,804 — — — 713 983,517 Commercial real estate - non-owner occupied 1,276,582 — — — 1,598 1,278,180 Residential real estate 1,248,160 3,457 143 — 9,546 1,261,306 Commercial and financial 963,828 851 41 — 3,598 968,318 Consumer 168,791 565 23 15 113 169,507 Paycheck Protection Program 1 69,434 — — 69 — 69,503 Total Portfolio Loans 4,908,686 4,873 207 84 15,822 4,929,672 Acquired Non-PCD Loans Construction and land development 31,438 — — — — 31,438 Commercial real estate - owner occupied 186,652 — 160 — — 186,812 Commercial real estate - non-owner occupied 381,510 — — — 1,044 382,554 Residential real estate 154,981 182 — — 1,794 156,957 Commercial and financial 84,180 — 40 — 175 84,395 Consumer 4,082 135 — — 441 4,658 Paycheck Protection Program 1 21,567 — — 37 — 21,604 Total Acquired Non-PCD Loans 864,410 317 200 37 3,454 868,418 PCD Loans Construction and land development 40 — — — 5 45 Commercial real estate - owner occupied 24,192 — — — 3,253 27,445 Commercial real estate - non-owner occupied 72,442 — — — 3,263 75,705 Residential real estate 5,386 — — — 1,705 7,091 Commercial and financial 13,547 — — — 3,096 16,643 Consumer 10 — — — — 10 Total PCD Loans 115,617 — — — 11,322 126,939 Total Loans $ 5,888,713 $ 5,190 $ 407 $ 121 $ 30,598 $ 5,925,029 1 Paycheck Protection Program loans are not reflected as past due when forgiveness applications are being processed by the SBA. Repayment of principal and interest is fully guaranteed by the U.S. government. 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 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 $1.2 million, $0.9 million, and $1.3 million in interest income on nonaccrual loans during the years ended December 31, 2021, 2020, and 2019, 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, 2021 (In thousands) Nonaccrual Loans With No Related Allowance Nonaccrual Loans With an Allowance Total Nonaccrual Loans Allowance for Credit Losses Construction and land development $ 37 $ 222 $ 259 $ 92 Commercial real estate - owner-occupied 2,976 990 3,966 419 Commercial real estate - non-owner occupied 4,490 1,415 5,905 27 Residential real estate 12,358 687 13,045 357 Commercial and financial 2,676 4,193 6,869 2,384 Consumer 29 525 554 525 Totals $ 22,566 $ 8,032 $ 30,598 $ 3,804 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 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, 2021 December 31, 2020 Construction and land development $ 271 $ 189 Commercial real estate - owner-occupied 4,706 11,992 Commercial real estate - non-owner occupied 4,923 7,285 Residential real estate 16,334 16,652 Commercial and financial 8,741 11,198 Consumer 741 586 Totals $ 35,716 $ 47,902 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. Some portion of 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, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Total Construction and Land Development Risk Ratings: Pass $ 94,318 $ 23,860 $ 38,058 $ 25,507 $ 3,995 $ 15,466 $ 29,349 $ 230,553 Special Mention — — — — — — — — Substandard — — — — — — — — Substandard Impaired — — — 222 — 49 — 271 Doubtful — — — — — — — — Total 94,318 23,860 38,058 25,729 3,995 15,515 29,349 230,824 Commercial real estate - owner occupied Risk Ratings: Pass 205,404 154,432 179,786 132,353 125,763 363,986 10,005 1,171,729 Special Mention — 6,527 5,370 649 218 3,250 — 16,014 Substandard — — — — 3,290 1,610 — 4,900 Substandard Impaired — — 2,742 310 596 1,483 — 5,131 Doubtful — — — — — — — — Total 205,404 160,959 187,898 133,312 129,867 370,329 10,005 1,197,774 Commercial real estate - non-owner occupied Risk Ratings: Pass 395,308 207,824 298,021 186,339 110,990 460,435 6,477 1,665,394 Special Mention — — 844 — 289 13,850 — 14,983 Substandard — 4,776 3,009 23,206 1,900 17,266 — 50,157 Substandard Impaired — 1,044 1,849 — 326 2,686 — 5,905 Doubtful — — — — — — — — Total 395,308 213,644 303,723 209,545 113,505 494,237 6,477 1,736,439 Residential real estate Risk Ratings: Pass 394,547 114,364 90,566 119,836 118,556 213,950 354,439 1,406,258 Special Mention — — — 70 — 1,243 532 1,845 Substandard — 340 — — 58 422 86 906 Substandard Impaired — 149 724 39 4,415 8,507 2,511 16,345 Doubtful — — — — — — — — Total 394,547 114,853 91,290 119,945 123,029 224,122 357,568 1,425,354 Commercial and financial Risk Ratings: Pass 340,826 180,677 97,072 68,232 39,331 56,053 246,568 1,028,759 Special Mention 530 15,587 — 237 251 84 876 17,565 Substandard — 371 2,605 3,594 1,436 3,217 339 11,562 Substandard Impaired — 196 4,561 3,694 1,371 1,520 128 11,470 Doubtful — — — — — — — — Total 341,356 196,831 104,238 75,757 42,389 60,874 247,911 1,069,356 December 31, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Total Consumer Risk Ratings: Pass 45,063 31,342 26,194 17,300 9,979 16,019 25,418 171,315 Special Mention — 24 431 37 167 3 1,199 1,861 Substandard — — 18 — 17 — 223 258 Substandard Impaired — — 92 23 74 118 434 741 Doubtful — — — — — — — — Total 45,063 31,366 26,735 17,360 10,237 16,140 27,274 174,175 Paycheck Protection Program Risk Ratings: Pass 87,036 4,071 — — — — — 91,107 Total 87,036 4,071 — — — — — 91,107 Consolidated Risk Ratings: Pass 1,562,502 716,570 729,697 549,567 408,614 1,125,909 672,256 5,765,115 Special Mention 530 22,138 6,645 993 925 18,430 2,607 52,268 Substandard — 5,487 5,632 26,800 6,701 22,515 648 67,783 Substandard Impaired — 1,389 9,968 4,288 6,782 14,363 3,073 39,863 Doubtful — — — — — — — — Total $ 1,563,032 $ 745,584 $ 751,942 $ 581,648 $ 423,022 $ 1,181,217 $ 678,584 $ 5,925,029 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 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 were fully reserved as of December 31, 2020. 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, encouraged 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 was available for modifications that were deemed to be COVID-related, where the borrower was not more than 30 days past due on December 31, 2019, and the modification was 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 allowed 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 on June 30, 2020, loans on deferral represented $1.1 billion, or 21% of total non-PPP loans. In the second half of 2020, the large majority of these borrowers successfully resumed making contractual payments, and the level of loans with accommodations decreased to $74.1 million, or 1% of total non-PPP loans at December 31, 2020, and to $1.2 million, or 0.02% of total non-PPP loans as of December 31, 2021. 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, 2021: Construction and land development — $ — $ — Commercial real estate - owner-occupied — — — Commercial real estate - non owner-occupied — — — Residential real estate 5 261 261 Commercial and financial 3 457 457 Consumer 4 84 84 Totals 12 $ 802 $ 802 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 Commercial real estate - non owner-occupied — — — 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 The TDRs described above resulted in a specific allowance for credit losses of $0.2 million as of December 31, 2021, and $0.2 million in specific allowance for credit losses as of December 31, 2020. During the year ended December 31, 2021 there

Allowance for Credit Losses

Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
Allowance for Credit Losses	Allowance for Credit Losses Activity in the allowance for credit losses is summarized as follows: For the Year Ended December 31, 2021 (In thousands) Beginning Initial Allowance on PCD Loans Acquired During the Period Provision Charge- Recoveries TDR Ending Construction and land development $ 4,920 $ — $ (2,300) $ — $ 133 $ (2) $ 2,751 Commercial real estate - owner occupied 9,868 — (1,289) — — — 8,579 Commercial real estate - non-owner occupied 38,266 1,327 (1,664) (1,327) 15 — 36,617 Residential real estate 17,500 — (5,822) (57) 1,196 (6) 12,811 Commercial and financial 18,690 1,719 2,292 (3,987) 1,030 — 19,744 Consumer 3,489 — (638) (727) 697 (8) 2,813 Paycheck Protection Program — — — — — — — Total $ 92,733 $ 3,046 $ (9,421) $ (6,098) $ 3,071 $ (16) $ 83,315 For the Year Ended 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. For the Year Ended December 31, 2019 (In thousands) Beginning Provision Charge- Recoveries TDR Ending 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 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, 2021, the Company utilized Moody’s most recent “U.S. Macroeconomic Outlook Baseline” scenario and considered the uncertainty associated with the assumptions in the Baseline scenario, including the potential for recurring COVID-19 infections, including from variants, actions contemplated by the Federal Reserve to address inflation through changes in monetary policy, and the resulting potential impact on the progress of the economic recovery. Outcomes in any or all of these factors could differ from the Baseline scenario, and the Company incorporated qualitative considerations reflecting the risk of uncertain economic conditions, and for additional dimensions of risk not captured in the quantitative model. In the Construction and Land Development segment, the decrease in reserves during the year reflects lower loan balances and improved economic variables relating to residential real estate and consumer confidence. 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, increases in the allowance resulting from loan growth were offset by the impact of improved economic variables primarily relating to unemployment. Risk characteristics include but are not limited to, collateral type, note structure, and loan seasoning. In the Commercial Real Estate - Non Owner-Occupied segment, the decrease in reserves reflects improved economic forecast variables including lower unemployment, partially offset by higher loan balances. 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, note structure, and loan seasoning 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 decrease in reserves reflects the impact of improved economic forecast variables including lower unemployment partially offset by higher loan balances. Risk characteristics considered for this segment include, but are not limited to, borrower FICO score, 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 is attributed to higher loan balances partially offset by improved economic variables primarily relating to unemployment. 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. The decline in the reserve during the year reflects improved economic forecast variables and lower loan balances. 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 comprised 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, 2021 and 2020 is shown in the following tables. December 31, 2021 Individually Evaluated Collectively Evaluated Total (In thousands) Recorded Associated Recorded Associated Recorded Associated Construction and land development $ 271 $ 92 $ 230,553 $ 2,659 $ 230,824 $ 2,751 Commercial real estate - owner occupied 5,131 419 1,192,643 8,160 1,197,774 8,579 Commercial real estate - non-owner occupied 5,905 27 1,730,534 36,590 1,736,439 36,617 Residential real estate 16,345 646 1,409,009 12,165 1,425,354 12,811 Commercial and financial 11,470 2,885 1,057,886 16,859 1,069,356 19,744 Consumer 741 685 173,434 2,128 174,175 2,813 Paycheck Protection Program — — 91,107 — 91,107 — Total $ 39,863 $ 4,754 $ 5,885,166 $ 78,561 $ 5,925,029 $ 83,315 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

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2021
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, 2021, the interest rate swaps had an aggregate notional value of $175.4 million, with a fair value of $8.0 million recorded in Other Assets and Other Liabilities. 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. The weighted average maturity was 6.7 years at December 31, 2021 and 7.5 years at December 31, 2020. 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, 2021 and 2020, the interest rate floors had a fair value of $0.3 million and $1.0 million, respectively, and are recorded in Other Assets in the consolidated balance sheet. For the years ended December 31, 2021 and 2020, the Company recognized losses through other comprehensive income of $0.7 million and $0.2 million, respectively, and reclassified $0.2 million and $18 thousand, respectively, out of accumulated other comprehensive income and into interest income. Over the next 12 months the Company expects to reclassify $0.4 million from accumulated other comprehensive income into interest income related to these agreements. (In thousands) Notional Amount Fair Value Balance Sheet Category December 31, 2021 Back-to-back swaps $ 175,392 $ 8,022 Other Assets and Other Liabilities Interest rate floors 300,000 290 Other Assets December 31, 2020 Back-to-back swaps $ 182,379 $ 13,339 Other Assets and Other Liabilities Interest rate floors 300,000 1,004 Other Assets

Bank Premises and Equipment

Bank Premises and Equipment	12 Months Ended
	Dec. 31, 2021
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, 2021 Premises (including land of $23,359) $ 95,810 $ (30,913) $ 64,897 Furniture and equipment 34,044 (26,537) 7,507 Total $ 129,854 $ (57,450) $ 72,404 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

Goodwill and Acquired Intangibl

Goodwill and Acquired Intangible Assets	12 Months Ended
	Dec. 31, 2021
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) 2021 2020 2019 Beginning of year $ 221,176 $ 205,286 $ 204,753 Changes from business combinations 30,978 15,890 533 Total $ 252,154 $ 221,176 $ 205,286 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) 2021 2020 2019 Beginning of year $ 14,577 $ 18,305 $ 24,807 Acquired CDI, including measurement period adjustments 3,454 2,129 (676) Amortization expense (5,033) (5,857) (5,826) End of year $ 12,998 $ 14,577 $ 18,305 (In months) Remaining average amortization period for CDI 39 44 47 The gross carrying amount and accumulated amortization of the Company's CDI subject to amortization as of: December 31, 2021 December 31, 2020 (In thousands) Gross Accumulated Gross Accumulated Core deposit intangible $ 41,596 $ (28,598) $ 38,144 $ (23,567) 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, 2021 is $4.8 million, $4.1 million, $1.5 million, $1.1 million and $0.9 million, respectively. The carrying value of servicing rights retained from the sale of the guaranteed portion of Small Business Administration (“SBA”) loans totaled $1.8 million and $2.2 million at December 31, 2021 and December 31, 2020, respectively.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2021
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) 2021 2020 2019 Maximum amount outstanding at any month end $ 124,101 $ 119,609 $ 193,388 Weighted average interest rate at end of year 0.12 % 0.16 % 1.17 % Average amount outstanding $ 113,881 $ 84,514 $ 106,142 Weighted average interest rate during the year 0.12 % 0.33 % 1.35 % 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) 2021 2020 2019 Fair value of pledged securities - overnight and continuous: Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities $ 134,577 $ 137,268 $ 94,354 The Company has available secured lines of credit of $1.6 billion, none of which was outstanding at December 31, 2021. The following table summarizes the Company's junior subordinated debentures and related trust preferred and common equity securities as of December 31, 2021: (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, 2021 SBCF Capital Trust I 3/31/2005 n/a 3/31/2035 $ 20,619 $ 20,000 $ 619 3 month LIBOR +175bps 1.97% SBCF Statutory Trust II 12/16/2005 n/a 12/16/2035 20,619 20,000 619 3 month LIBOR +133bps 1.53% SBCF Statutory Trust III 6/29/2007 n/a 6/15/2037 12,372 12,000 372 3 month LIBOR +135bps 1.55% BANKshares, Inc. Statutory Trust I 12/19/2002 10/1/2014 12/26/2032 5,155 5,000 155 3 month LIBOR +325bps 3.47% BANKshares, Inc. Statutory Trust II 3/17/2004 10/1/2014 3/17/2034 4,124 4,000 124 3 month LIBOR +279bps 3.01% BANKshares, Inc. Capital Trust I 12/15/2005 10/1/2014 12/15/2035 5,155 5,000 155 3 month LIBOR +139bps 1.55% Grand Bank Capital Trust I 10/29/2004 7/17/2015 10/29/2034 7,217 7,000 217 3 month LIBOR +198bps 2.11% $ 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. 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, 2021, 2020 and 2019, all interest payments on trust preferred securities were current. Distributions on the trust preferred securities are payable quarterly. 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, 2021
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 $3.1 million in 2021, $2.8 million in 2020, and $2.4 million in 2019. 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 that 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 or upon the event of a change-in-control. Awards are currently granted under the Seacoast 2021 Incentive Plan (“2021 Plan”), which shareholders approved on May 26, 2021 with 1,750,000 authorized shares for issuance, plus shares of underlying awards outstanding under the 2013 Incentive Plan (the “Prior Plan”) that thereafter terminate or expire unexercised or are cancelled, forfeited or lapse for any reason under the Prior Plan. The 2021 Plan was modified in August 2021 to authorize 356,497 shares for issuance related to options granted in the acquisition of Legacy Bank of Florida (“Legacy Bank”). The 2021 Plan expires on May 26, 2031. The 2021 Plan replaced the Prior Plan. Upon adoption of the 2021 Plan, no further awards were granted under the Prior Plan, which remains in effect only so long as awards granted thereunder remain outstanding. In 2021, as part of the Legacy Bank acquisition, 356,497 options were granted to replace outstanding Legacy Bank options. These options had a weighted average exercise price of $16.70 and were fully vested upon acquisition. In accordance with ASC Topic 805, Business Combinations , the value of the replacement awards associated with pre-combination service, $4.7 million, was considered purchase consideration, and the value of the replacement awards associated with post-combination service, $0.9 million, was recognized as compensation expense in 2021. The impact of share-based compensation on the Company’s financial results is presented below: For the Year Ended December 31, (In thousands) 2021 2020 2019 Share-based compensation expense 1 $ 8,685 $ 7,304 $ 7,244 Income tax benefit (2,067) (1,737) (1,723) 1 Excludes $0.9 million in 2021 associated with replacement options granted in the acquisition of Legacy Bank. 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, 2021 is presented below: (In thousands) Unrecognized Weighted-Average Period Remaining (Years) Restricted stock awards $ 7,645 1.71 Restricted stock units 3,282 2.07 Stock options — — Total $ 10,927 1.82 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, 2021, and changes during the year then ended, is presented below: Restricted Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2021 425,154 $ 20.03 Granted 218,695 35.08 Forfeited/Canceled (39,729) 21.72 Vested (205,416) 23.03 Non-vested at December 31, 2021 398,704 $ 26.68 Information regarding restricted stock awards during each of the following years is presented below: For the Year Ended December 31, 2021 2020 2019 Shares granted 218,695 379,869 157,861 Weighted-average grant date fair value $ 35.08 $ 18.36 $ 26.86 Fair value of awards vested 1 $ 4,731 $ 3,745 $ 4,128 1 Based on grant date fair value, in thousands Restricted Stock Units RSUs allow the grantee to earn 0%-225% of the target award based on the Company's achievement of performance goals relating to average annual earnings per share growth and average annual return on average tangible equity relative to a group of peer companies, 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, 2021, and changes during the year then ended, is presented below: Restricted Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2021 309,597 $ 23.54 Granted 103,073 35.24 Forfeited/Canceled (52,827) 25.83 Vested (74,622) 25.95 Non-vested at December 31, 2021 285,221 $ 26.71 Information regarding restricted stock units during each of the following years is presented below: For the Year Ended December 31, 2021 2020 2019 Shares granted 103,073 171,287 75,002 Weighted-average grant date fair value $ 35.24 $ 17.29 $ 30.02 Fair value of awards vested 1 $ 1,936 $ 2,962 $ 2,864 1 Based on grant date fair value, in thousands Stock Options The fair value of options granted is estimated on the date of grant using the Black-Scholes options-pricing model. In 2021, as part of the acquisition of Legacy Bank, the Company granted to each holder of Legacy Bank options, an option to purchase shares of Seacoast common stock on the same terms and conditions as the Legacy Bank option, with the number of shares and exercise price reflective of the conversion ratio specified in the merger agreement. The Company issued no stock options in 2020. For the Year Ended December 31, 2021 2020 2019 Risk-free interest rates 0.12 % n/a 2.53 % Expected dividend yield 1.65 % n/a — % Expected volatility 36.87 % n/a 34.50 % Expected lives (years) 1.0 n/a 5.0 A summary of the Company’s stock options as of December 31, 2021, 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, 2021 839,884 $ 22.94 Granted 356,497 16.70 Exercised (384,035) 19.10 Forfeited (2,166) 18.65 Outstanding at December 31, 2021 810,180 $ 22.02 4.45 $ 10,829 Exercisable at December 31, 2021 810,180 $ 22.02 4.45 $ 10,829 The following table presents information related to stock options during each of the following years: For the Year Ended December 31, 2021 2020 2019 Options granted 356,497 n/a 3,438 Weighted-average grant date fair value $ 16.70 n/a $ 28.42 Intrinsic value of stock options exercised, in thousands 5,808 830 277 The following table presents information related to stock options as of December 31, 2021: Range of Exercise Prices Options Remaining Options Weighted $5.88 to $14.82 300,299 2.2 300,299 $ 12.12 $15.80 to $28.69 331,814 5.5 331,814 26.09 $31.15 to $31.15 178,067 6.3 178,067 31.15 Total 810,180 4.5 810,180 $ 22.02 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 in 2009, 2013, and 2021. Under the ESPP, the Company is authorized to issue up to 800,000 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. Employee contributions to the ESPP are made through payroll deductions. 2021 2020 2019 ESPP shares purchased 14,834 19,713 16,320 Weighted-average employee purchase price $ 32.43 $ 20.68 $ 25.39

Lease Commitments

Lease Commitments	12 Months Ended
	Dec. 31, 2021
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 consists of: For the Year Ended December 31, (In thousands) 2021 2020 2019 Operating lease cost $ 5,872 $ 5,738 $ 5,570 Variable lease cost 996 1,325 1,211 Short-term lease cost 564 497 715 Sublease income (601) (684) (618) Total lease cost $ 6,831 $ 6,876 $ 6,878 The following table provides supplemental information related to leases: As of and For the Year Ended December 31, (In thousands, except for weighted average data) 2021 2020 Operating lease right-of-use assets $ 35,256 $ 25,538 Operating lease liabilities 38,330 28,959 Cash paid during the year for amounts included in the measurement of operating lease liabilities 11,117 6,035 Right-of-use assets recorded during the year in exchange for new or renewed operating lease obligations 12,459 2,095 Right-of-use assets obtained during the year through bank acquisition 2,606 2,343 Weighted average remaining lease term for operating leases 8.3 years 8.5 years Weighted average discount rate for operating leases 4.25 % 4.62 % 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, 2021 are as follows: (In thousands) 2022 $ 6,597 2023 6,166 2024 6,032 2025 5,561 2026 4,869 Thereafter 15,505 Total undiscounted cash flows 44,730 Less: Net present value adjustment (6,400) Total $ 38,330

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes is as follows: For the Year Ended December 31, (In thousands) 2021 2020 2019 Current Federal $ 23,661 $ 21,688 $ 20,954 State 3,882 4,471 1,932 Deferred Federal 6,800 (2,697) 2,808 State (8) (644) 4,179 $ 34,335 $ 22,818 $ 29,873 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) 2021 2020 2019 Tax rate applied to income before income taxes $ 33,335 $ 21,122 $ 27,008 Increase (decrease) resulting from the effects of: Tax law change — (375) — Nondeductible acquisition costs 419 199 125 Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance (1,276) (1,110) (1,282) State income taxes (813) (804) (1,283) Tax credit investments (213) (72) (72) Stock compensation (1,239) (111) (698) Executive compensation disallowance 253 — — Other (5) 142 (36) Federal tax provision 30,461 18,991 23,762 State tax provision 3,874 3,827 6,111 Total income tax provision $ 34,335 $ 22,818 $ 29,873 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) 2021 2020 Allowance for credit losses $ 22,686 $ 24,158 Other real estate owned 52 422 Accrued stock compensation 2,323 1,973 Federal tax loss carryforward 2,138 2,857 State tax loss carryforward 1,226 1,333 Lease liabilities 9,399 7,101 Net unrealized securities losses 2,287 — Deferred compensation 3,276 2,565 Accrued interest and fee income — 995 Other 477 38 Gross deferred tax assets 43,864 41,442 Less: Valuation allowance — — Deferred tax assets net of valuation allowance 43,864 41,442 Core deposit base intangible (3,134) (3,234) Accrued interest and fee income (1,660) — Net unrealized securities gains — (5,890) Premises and equipment (776) (534) Right of use assets (8,645) (6,262) Other (2,328) (1,893) Gross deferred tax liabilities (16,543) (17,813) Net deferred tax assets $ 27,321 $ 23,629 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 2021, unrealized losses of $9.3 million resulted in a deferred tax asset of $2.3 million. In 2020, unrealized gains of $26.3 million resulted in a deferred tax liability of $5.9 million. At December 31, 2021, the Company's net deferred tax assets (“DTAs”) of $27.3 million consisted of $20.8 million of net U.S. federal DTAs and $6.5 million of net state DTAs. At December 31, 2020, the Company's net DTAs of $23.6 million consisted of $18.0 million of 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, 2021 that it is more likely than not that the net DTAs of $27.3 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 $27.3 million in net DTAs well in advance of the statutory carryforward period. At December 31, 2021, approximately $2.1 million of DTAs related to federal net operating losses which will expire in annual installments beginning in 2029 through 2032. Additionally, $1.2 million of the DTAs related 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, 2021. In accordance with ASC Topic 718, Compensation – Stock Compensation, the Company recognized $0.9 million, $0.1 million and $0.8 million in 2021, 2020, and 2019, 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 $1.6 million, $0.9 million and $0.9 million was reflected as income tax expense for the years ended December 31, 2021, 2020, and 2019, respectively. The amounts of affordable housing tax credits, amortization and tax benefits recorded as income tax expense for the year ended December 31, 2021 were $1.2 million, $1.6 million, and $0.7 million, respectively. The amounts 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, and for the year ended December 31, 2019 were $0.8 million, $0.9 million and $0.2 million, respectively. The carrying value of the affordable housing credit investments was $30.1 million and $16.4 million at December 31, 2021 and 2020, respectively, of which $23.2 million and $9.9 million, respectively, was 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 2022. 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 2018 Florida 2018 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 2019 of deferred tax assets affected by the change. During 2021, the State of Florida announced a temporary further reduction in the corporate income tax rate from 4.458% to 3.535%, retroactive to the beginning of 2021. The tax rate increased to 5.5% effective January 1, 2022, resulting in a tax benefit of $0.8 million which was recognized in 2021 upon the adjustment of the value of deferred tax assets affected by the change. 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 was reflected as a credit to retained earnings to reflect the tax impact of increased credit reserves. Accordingly, $5.5 million of such impact was 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 recorded the resulting benefit reflecting taxes recoverable at the 35% tax rate. This resulted in the recognition in 2020 of an additional $0.4 million income tax benefit on the Company's Consolidated Statements of Income.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2021
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, 2021 and 2020, 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, 2021: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 1,200,885 18.21 % n/a n/a $ 527,630 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 1,147,306 17.40 n/a n/a 395,723 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 1,075,656 16.31 n/a n/a 296,792 ≥ 4.50 Leverage Ratio (to adjusted average assets) 1,147,306 11.68 n/a n/a 392,763 ≥ 4.00 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 Seacoast National Bank (A Wholly Owned Bank Subsidiary) At December 31, 2021: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 1,099,439 16.68 % $ 658,819 ≥ 10.00 % $ 527,055 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 1,045,860 15.86 527,055 ≥ 8.00 395,291 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 1,045,856 15.86 428,232 ≥ 6.50 296,468 ≥ 4.50 Leverage Ratio (to adjusted average assets) 1,045,860 10.65 490,798 ≥ 5.00 392,638 ≥ 4.00 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 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 800,000 common shares for issuance in connection with an employee stock purchase plan and 1,750,000 common shares for issuance in connection with an employee stock-based incentive 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.

Seacoast Banking Corporation of

Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information	12 Months Ended
	Dec. 31, 2021
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) 2021 2020 Assets Cash $ 57 $ 70 Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days 98,398 70,074 Investment in subsidiaries 1,286,478 1,134,536 Other assets 1,140 659 $ 1,386,073 $ 1,205,339 Liabilities and Shareholders' Equity Subordinated debt $ 71,646 $ 71,365 Other liabilities 3,795 3,676 Shareholders' equity 1,310,632 1,130,298 $ 1,386,073 $ 1,205,339 Statements of Income Year Ended December 31, (In thousands) 2021 2020 2019 Income Interest/other $ 167 $ 270 $ 679 Dividends from subsidiary Bank 47,684 20,230 18,084 Total income 47,851 20,500 18,763 Interest expense 1,683 2,236 3,368 Other expenses 765 838 651 Total expenses 2,448 3,074 4,019 Income before income taxes and equity in undistributed income of subsidiaries 45,403 17,426 14,744 Income tax benefit (481) (589) (702) Income before equity in undistributed income of subsidiaries 45,884 18,015 15,446 Equity in undistributed income of subsidiaries 78,519 59,749 83,293 Net income $ 124,403 $ 77,764 $ 98,739 Statements of Cash Flows Year Ended December 31, (In thousands) 2021 2020 2019 Cash flows from operating activities Adjustments to reconcile net income to net cash provided Net Income $ 124,403 $ 77,764 $ 98,739 Equity in undistributed income of subsidiaries (78,519) (59,749) (83,293) Net (increase) decrease in other assets (489) 1,772 (738) Net increase (decrease) in other liabilities 400 256 265 Net cash provided by operating activities 45,795 20,043 14,973 Cash flows from investing activities Net cash paid for bank acquisition — (1,462) — Net (advances)/repayments with subsidiary (28,324) (17,095) (12,861) Net cash used in investment activities (28,324) (18,557) (12,861) Cash flows from financing activities Dividends paid (22,506) — — Stock based employment benefit plans 5,022 (1,486) (2,239) Net cash used in financing activities (17,484) (1,486) (2,239) Net change in cash (13) — (127) Cash at beginning of year 70 70 197 Cash at end of year $ 57 $ 70 $ 70 Supplemental disclosure of cash flow information: Cash paid during the period for interest $ 1,441 $ 1,992 $ 3,186

Contingent Liabilities and Comm

Contingent Liabilities and Commitments with Off-Balance Sheet Risk	12 Months Ended
	Dec. 31, 2021
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) 2021 2020 Contract or Notional Amount Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ 1,980,338 $ 1,548,482 Standby letters of credit and financial guarantees written: Secured 12,091 11,167 Unsecured 1,189 1,197 Unfunded limited partner equity commitment 36,393 21,390 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, 2021 and 2020 totaled $13.3 million and $12.4 million, respectively. Unfunded limited partner equity commitments at December 31, 2021 totaled $36.4 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, 2021
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, 2021 and December 31, 2020 included: Fair Value Quoted Prices in Significant Other Significant Other (In thousands) Measurements Level 1 Level 2 Level 3 At December 31, 2021 Financial Assets Available-for-sale debt securities 1 $ 1,644,319 $ 197 $ 1,644,122 $ — Derivative financial instruments 2 8,312 — 8,312 — Loans held for sale 2 31,791 — 31,791 — Loans 3 8,443 — 1,558 6,885 Other real estate owned 4 13,618 — — 13,618 Equity securities 5 9,316 9,316 — — Financial Liabilities Derivative financial instruments 2 $ 8,022 $ — $ 8,022 $ — 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 — 1 See “Note 3 - Securities” for further detail of fair value of individual investment categories. 2 Recurring fair value basis determined using observable market data. 3 See “Note 4 - 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, 2021 and 2020. The aggregate fair value and contractual balance of loans held for sale as of December 31, 2021 and 2020 is as follows: December 31, (In thousands) 2021 2020 Aggregate fair value $ 31,791 $ 68,890 Contractual balance 30,963 66,415 Excess 828 2,475 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, 2021, capitalization rates utilized to determine fair value of the underlying collateral averaged approximately 7.1%. 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 $13.1 million with a specific reserve of $4.7 million at December 31, 2021, compared to $16.5 million with a specific reserve of $7.7 million at 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. 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, 2021 and 2020. 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, 2021 and December 31, 2020 is as follows: Carrying Quoted Prices in Significant Other Significant Other (In thousands) Amount Level 1 Level 2 Level 3 At December 31, 2021 Financial Assets Held-to-maturity debt securities 1 $ 638,640 $ — $ 627,398 $ — Loans, net 5,833,271 — — 5,907,447 Financial Liabilities Deposits 8,067,589 — — 8,067,995 Subordinated debt 71,646 — 69,348 — 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 — 1 See “Note 3 - 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, 2021 and December 31, 2020: 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.

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2021
Business Combinations [Abstract]
Business Combinations	Business Combinations Acquisition of Legacy Bank of Florida On August 6, 2021, the Company completed its acquisition of Legacy Bank of Florida (“Legacy Bank”). Prior to the acquisition, Legacy Bank operated five branches in Broward and Palm Beach counties. As a result of this acquisition, the Company expects to 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 Legacy Bank. Under the terms of the definitive agreement, each share of Legacy Bank common stock was converted into the right to receive 0.1703 share of Seacoast common stock. (In thousands, except per share data) August 6, 2021 Number of Legacy Bank common shares outstanding $ 15,778 Per share exchange ratio 0.1703 Number of shares of common stock issued 2,687 Multiplied by common stock price per share on August 6, 2021 $ 32.19 Value of common stock issued 86,487 Cash paid for fractional shares 7 Fair value of options converted 4,736 Total purchase price $ 91,230 The acquisition of Legacy Bank was accounted for under the acquisition method in accordance with ASC Topic 805, Business Combinations . The Company recognized goodwill of $31.0 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. As part of the Legacy Bank acquisition, 356,497 options were granted to replace outstanding Legacy Bank options. These options had a weighted average exercise price of $16.70 and were fully vested upon acquisition. In accordance with ASC Topic 805, Business Combinations , the value of the replacement awards associated with pre-combination service, $4.7 million, was considered purchase consideration, and the value of the replacement awards associated with post-combination service, $0.9 million, was recognized as compensation expense in 2021. (In thousands) Initially Measured Assets: Cash $ 98,107 Investment securities 992 Loans 477,215 Bank premises and equipment 2,577 Core deposit intangibles 3,454 Goodwill 30,978 Other assets 15,532 Total assets $ 628,855 Liabilities: Deposits 494,921 Other liabilities 42,705 Total liabilities $ 537,626 The table below presents information with respect to the fair value and unpaid principal balance of acquired loans at the acquisition date. August 6, 2021 (In thousands) Book Balance Fair Value Loans: Construction and land development $ 37,558 $ 36,651 Commercial real estate - owner-occupied 35,765 35,363 Commercial real estate - non owner-occupied 241,322 237,091 Residential real estate 71,118 70,541 Commercial and financial 61,274 58,324 Consumer 647 647 PPP loans 38,598 38,598 Total acquired loans $ 486,282 $ 477,215 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 6, 2021 Book balance of loans at acquisition $ 66,371 Allowance for credit losses at acquisition (3,046) Non-credit related discount (736) Total PCD loans acquired $ 62,589 The acquisition of Legacy Bank resulted in the addition of $11.2 million in allowance for credit losses, including the $3.0 million identified in the table above for PCD loans, and $8.2 million for non-PCD loans recorded through the provision for credit losses at the date of acquisition. 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 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. (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 acquisition of Fourth Street resulted in the addition of $10.4 million in allowance for credit losses, including the $5.8 million identified in the table above for PCD loans, and $4.6 million for non-PCD loans recorded through the provision for credit losses at the date of acquisition. 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. (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 acquisition of FBPB resulted in the addition of $2.3 million in allowance for credit losses, including the $0.5 million identified in the table above for PCD loans, and $1.8 million for non-PCD loans recorded through the provision for credit losses at the date of acquisition. 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 Costs Acquisition costs included in the Company’s income statement for the years ended December 31, 2021, 2020 and 2019 were $7.9 million, $9.1 million, and $1.0 million, respectively. Pro-Forma Information Pro-forma data as of 2021 and 2020 present information as if the acquisition of Legacy Bank occurred at the beginning of 2020: Twelve Months Ended (In thousands, except per share data) 2021 2020 Net interest income $ 288,971 $ 281,244 Net income available to common shareholders 140,851 71,124 EPS - basic $ 2.41 $ 1.27 EPS - diluted $ 2.39 $ 1.26 2022 Acquisitions Acquisition of Florida Business Bank On January 3, 2022, the Company completed its acquisition of Business Bank of Florida, Corp, (“BBFC”). Simultaneously, upon completion of the merger of BBFC and the Company, BBFC's wholly owned subsidiary bank, Florida Business Bank, was merged with and into Seacoast Bank. Prior to the acquisition, Florida Business Bank operated one branch in Melbourne, Florida. The Company acquired 100% of the outstanding common stock of BBFC. Under the terms of the definitive agreement, each share of BBFC common stock was converted into the right to receive 0.7997 share of Seacoast common stock. (In thousands, except per share data) January 3, 2022 Number of BBFC common shares outstanding 1,112 Per share exchange ratio 0.7997 Number of shares of common stock issued 889 Multiplied by common stock price per share on January 3, 2022 $ 35.39 Value of common stock issued 31,480 Fair value of options converted 497 Total purchase price $ 31,977 Acquisition of Sabal Palm Bancorp, Inc. On January 3, 2022, the Company completed its acquisition of Sabal Palm Bancorp, Inc. (“Sabal Palm”). Simultaneously, upon completion of the merger of Sabal Palm and the Company, Sabal Palm's wholly owned subsidiary bank, Sabal Palm Bank, was merged with and into Seacoast Bank. Prior to the acquisition, Sabal Palm Bank operated three branches in the Sarasota area. The Company acquired 100% of the outstanding common stock of Sabal Palm. Under the terms of the definitive agreement, each share of Sabal Palm common stock was converted into the right to receive 0.2203 share of Seacoast common stock. (In thousands, except per share data) January 3, 2022 Number of Sabal Palm common shares outstanding 7,536 Per share exchange ratio 0.2203 Number of shares of common stock issued 1,660 Multiplied by common stock price per share on January 3, 2022 $ 35.39 Value of common stock issued 58,762 Fair value of options converted 3,336 Total purchase price $ 62,098 The acquisitions of BBFC and Sabal Palm will be accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations. The Company's assessment of the fair value of assets acquired and liabilities assumed as of the acquisition date is incomplete at the time of this filing; therefore, certain disclosures have been omitted. The Company expects to recognize goodwill in each of these transactions, which is expected to be nondeductible for tax purposes.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
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 consumer banking, wealth management, mortgage services to customers at more than 50 full-service branches across Florida, and through advanced mobile and online banking solutions. 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.
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.
Credit losses on securities	Credit losses on securities: For securities classified as held-to-maturity, management must estimate expected credit losses over the remaining expected life and recognize this estimate as an allowance for credit losses. Debt securities that are available-for-sale are analyzed quarterly for credit losses. The analysis is performed on an individual security basis for all securities where fair value has declined below amortized cost. Fair value is based upon pricing obtained from third party pricing services. However, on occasion pricing provided by the pricing services may not be consistent with other observed prices in the market for similar securities. Using observable market factors, including interest rate and yield curves, volatilities, prepayment speeds, loss severities and default rates, the Company may at times validate the observed prices using a discounted cash flow model and using the observed prices for similar securities to determine the fair value of its securities. Both quantitative and qualitative assessments are utilized to determine if a security has a credit loss. Quantitative assessments are based on a discounted cash flow method. Qualitative assessments consider a range of factors including: percent decline in fair value, rating downgrades, subordination, duration, amortized loan-to-value, and the ability of the issuers to pay all amounts due in accordance with the contractual terms.
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 and effective through 2021, rules defined in the Coronavirus Aid, Relief and Economic Security (“CARES”) Act and a joint statement issued by federal regulators in consultation with FASB provided 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
Allowance for credit losses on loans and reserve for unfunded lending commitments	Allowance for credit losses on loans: On January 1, 2020, the Company adopted Accounting Standards Codification No. 326, Financial Instruments - Credit Losses (ASC 326), which replaced the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss ("CECL") methodology. 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 January 1, 2020 are presented under ASC Topic 326, while prior amounts continue to be reported in accordance with previously applicable GAAP. 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 ("PCD"). Acquired loans which do not meet the definition of PCD are classified by the Company as acquired Non-PCD. The Company estimates the allowance for credit losses on loans 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. The allowance for credit losses is measured on a collective basis when similar risk characteristics exist. 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.
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 Accumulated Other Comprehensive Income (“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 6 – 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, other real estate owned, 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
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 the fair value of the premises is less than amortized book value, a write down is recorded through noninterest expense. Costs to maintain the property 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.
Other Investments	Other Investments: Included in Other Assets are investments in funds generating affordable housing tax credits, and investments in Small Business Investment Companies (“SBICs”), which are privately owned and operated companies licensed by the U.S. Small Business Administration (“SBA”) to invest in small businesses. Investments generating tax credits are accounted for using the “proportional amortization” method. Under this method, the investor amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits allocated to the investor. SBIC investments are held at cost less impairment, if any. Income from SBIC investments will vary amongst periods and is recognized in earnings. 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 recognized in earnings.
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 (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	For the Year Ended December 31, (In thousands, except per share data) 2021 2020 2019 Basic earnings per share Net Income $ 124,403 $ 77,764 $ 98,739 Total weighted average common stock outstanding 56,586 53,502 51,449 Net income per share $ 2.20 $ 1.45 $ 1.92 Diluted earnings per share Net Income $ 124,403 $ 77,764 $ 98,739 Total weighted average common stock outstanding 56,586 53,502 51,449 Add: Dilutive effect of employee restricted stock and stock options (See “Note 10 - Employee Benefits and Stock Compensation”) 502 428 580 Total weighted average diluted stock outstanding 57,088 53,930 52,029 Net income per share $ 2.18 $ 1.44 $ 1.90 Net income has not been allocated to unvested restricted stock awards that are participating securities because the amounts that would be allocated are not material to net income per share of common stock. Unvested restricted stock awards that are participating securities represent less than one percent of all of the outstanding shares of common stock for each of the periods presented.

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 and December 31, 2020 are summarized as follows: December 31, 2021 (In thousands) Amortized Gross Gross Fair Available-for-Sale Debt Securities U.S. Treasury securities and obligations of U.S. government agencies $ 6,466 $ 316 $ (3) $ 6,779 Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 1,234,721 8,308 (20,309) 1,222,720 Private mortgage-backed securities and collateralized mortgage obligations 88,096 1,091 (420) 88,767 Collateralized loan obligations 292,751 63 (124) 292,690 Obligations of state and political subdivisions 31,624 1,740 (1) 33,363 Totals $ 1,653,658 $ 11,518 $ (20,857) $ 1,644,319 Held-to-Maturity Debt Securities Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities $ 638,640 $ 3,828 $ (15,070) $ 627,398 Totals $ 638,640 $ 3,828 $ (15,070) $ 627,398 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
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, 2021 and December 31, 2020 are summarized as follows: December 31, 2021 (In thousands) Amortized Gross Gross Fair Available-for-Sale Debt Securities U.S. Treasury securities and obligations of U.S. government agencies $ 6,466 $ 316 $ (3) $ 6,779 Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 1,234,721 8,308 (20,309) 1,222,720 Private mortgage-backed securities and collateralized mortgage obligations 88,096 1,091 (420) 88,767 Collateralized loan obligations 292,751 63 (124) 292,690 Obligations of state and political subdivisions 31,624 1,740 (1) 33,363 Totals $ 1,653,658 $ 11,518 $ (20,857) $ 1,644,319 Held-to-Maturity Debt Securities Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities $ 638,640 $ 3,828 $ (15,070) $ 627,398 Totals $ 638,640 $ 3,828 $ (15,070) $ 627,398 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
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 $ — $ — $ 2,174 $ 2,210 Due after one year through five years — — 14,017 14,841 Due after five years through ten years — — 7,041 7,341 Due after ten years — — 14,858 15,750 — — 38,090 40,142 Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 638,640 627,398 1,234,721 1,222,720 Private mortgage-backed securities and collateralized mortgage obligations — — 88,096 88,767 Collateralized loan obligations — — 292,751 292,690 Totals $ 638,640 $ 627,398 $ 1,653,658 $ 1,644,319
Schedule of Unrealized Loss and Fair Value on Investments	The tables below indicate the fair value of available-for-sale debt securities with unrealized losses for which no allowance for credit losses has been recorded. December 31, 2021 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 $ 97 $ (1) $ 245 $ (2) $ 342 $ (3) Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities 955,881 (19,575) 11,953 (734) 967,834 (20,309) Private mortgage-backed securities and collateralized mortgage obligations 33,640 (173) 9,628 (247) 43,268 (420) Collateralized loan obligations 123,202 (81) 9,461 (43) 132,663 (124) Obligations of state and political subdivisions 499 (1) — — 499 (1) Totals $ 1,113,319 $ (19,831) $ 31,287 $ (1,026) $ 1,144,606 $ (20,857) 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)

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 (In thousands) Portfolio Loans Acquired Non-PCD Loans PCD Loans Total Construction and land development $ 199,341 $ 31,438 $ 45 $ 230,824 Commercial real estate - owner occupied 983,517 186,812 27,445 1,197,774 Commercial real estate - non-owner occupied 1,278,180 382,554 75,705 1,736,439 Residential real estate 1,261,306 156,957 7,091 1,425,354 Commercial and financial 968,318 84,395 16,643 1,069,356 Consumer 169,507 4,658 10 174,175 Paycheck Protection Program 69,503 21,604 — 91,107 Totals $ 4,929,672 $ 868,418 $ 126,939 $ 5,925,029 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
Schedule of Past Due Financing Receivables	The following table presents the status of net loan balances as of December 31, 2021 and December 31, 2020. Loans on short-term payment deferral at the reporting date are reported as current. December 31, 2021 (In thousands) Current Accruing Accruing Accruing Nonaccrual Total Portfolio Loans Construction and land development $ 199,087 $ — $ — $ — $ 254 $ 199,341 Commercial real estate - owner occupied 982,804 — — — 713 983,517 Commercial real estate - non-owner occupied 1,276,582 — — — 1,598 1,278,180 Residential real estate 1,248,160 3,457 143 — 9,546 1,261,306 Commercial and financial 963,828 851 41 — 3,598 968,318 Consumer 168,791 565 23 15 113 169,507 Paycheck Protection Program 1 69,434 — — 69 — 69,503 Total Portfolio Loans 4,908,686 4,873 207 84 15,822 4,929,672 Acquired Non-PCD Loans Construction and land development 31,438 — — — — 31,438 Commercial real estate - owner occupied 186,652 — 160 — — 186,812 Commercial real estate - non-owner occupied 381,510 — — — 1,044 382,554 Residential real estate 154,981 182 — — 1,794 156,957 Commercial and financial 84,180 — 40 — 175 84,395 Consumer 4,082 135 — — 441 4,658 Paycheck Protection Program 1 21,567 — — 37 — 21,604 Total Acquired Non-PCD Loans 864,410 317 200 37 3,454 868,418 PCD Loans Construction and land development 40 — — — 5 45 Commercial real estate - owner occupied 24,192 — — — 3,253 27,445 Commercial real estate - non-owner occupied 72,442 — — — 3,263 75,705 Residential real estate 5,386 — — — 1,705 7,091 Commercial and financial 13,547 — — — 3,096 16,643 Consumer 10 — — — — 10 Total PCD Loans 115,617 — — — 11,322 126,939 Total Loans $ 5,888,713 $ 5,190 $ 407 $ 121 $ 30,598 $ 5,925,029 1 Paycheck Protection Program loans are not reflected as past due when forgiveness applications are being processed by the SBA. Repayment of principal and interest is fully guaranteed by the U.S. government. 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
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, 2021 (In thousands) Nonaccrual Loans With No Related Allowance Nonaccrual Loans With an Allowance Total Nonaccrual Loans Allowance for Credit Losses Construction and land development $ 37 $ 222 $ 259 $ 92 Commercial real estate - owner-occupied 2,976 990 3,966 419 Commercial real estate - non-owner occupied 4,490 1,415 5,905 27 Residential real estate 12,358 687 13,045 357 Commercial and financial 2,676 4,193 6,869 2,384 Consumer 29 525 554 525 Totals $ 22,566 $ 8,032 $ 30,598 $ 3,804 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
Schedule of Collateral Dependent Loans	The following table presents collateral-dependent loans as of: (In thousands) December 31, 2021 December 31, 2020 Construction and land development $ 271 $ 189 Commercial real estate - owner-occupied 4,706 11,992 Commercial real estate - non-owner occupied 4,923 7,285 Residential real estate 16,334 16,652 Commercial and financial 8,741 11,198 Consumer 741 586 Totals $ 35,716 $ 47,902 December 31, (In thousands) 2021 2020 2019 Fair value of pledged securities - overnight and continuous: Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities $ 134,577 $ 137,268 $ 94,354
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, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Total Construction and Land Development Risk Ratings: Pass $ 94,318 $ 23,860 $ 38,058 $ 25,507 $ 3,995 $ 15,466 $ 29,349 $ 230,553 Special Mention — — — — — — — — Substandard — — — — — — — — Substandard Impaired — — — 222 — 49 — 271 Doubtful — — — — — — — — Total 94,318 23,860 38,058 25,729 3,995 15,515 29,349 230,824 Commercial real estate - owner occupied Risk Ratings: Pass 205,404 154,432 179,786 132,353 125,763 363,986 10,005 1,171,729 Special Mention — 6,527 5,370 649 218 3,250 — 16,014 Substandard — — — — 3,290 1,610 — 4,900 Substandard Impaired — — 2,742 310 596 1,483 — 5,131 Doubtful — — — — — — — — Total 205,404 160,959 187,898 133,312 129,867 370,329 10,005 1,197,774 Commercial real estate - non-owner occupied Risk Ratings: Pass 395,308 207,824 298,021 186,339 110,990 460,435 6,477 1,665,394 Special Mention — — 844 — 289 13,850 — 14,983 Substandard — 4,776 3,009 23,206 1,900 17,266 — 50,157 Substandard Impaired — 1,044 1,849 — 326 2,686 — 5,905 Doubtful — — — — — — — — Total 395,308 213,644 303,723 209,545 113,505 494,237 6,477 1,736,439 Residential real estate Risk Ratings: Pass 394,547 114,364 90,566 119,836 118,556 213,950 354,439 1,406,258 Special Mention — — — 70 — 1,243 532 1,845 Substandard — 340 — — 58 422 86 906 Substandard Impaired — 149 724 39 4,415 8,507 2,511 16,345 Doubtful — — — — — — — — Total 394,547 114,853 91,290 119,945 123,029 224,122 357,568 1,425,354 Commercial and financial Risk Ratings: Pass 340,826 180,677 97,072 68,232 39,331 56,053 246,568 1,028,759 Special Mention 530 15,587 — 237 251 84 876 17,565 Substandard — 371 2,605 3,594 1,436 3,217 339 11,562 Substandard Impaired — 196 4,561 3,694 1,371 1,520 128 11,470 Doubtful — — — — — — — — Total 341,356 196,831 104,238 75,757 42,389 60,874 247,911 1,069,356 December 31, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Total Consumer Risk Ratings: Pass 45,063 31,342 26,194 17,300 9,979 16,019 25,418 171,315 Special Mention — 24 431 37 167 3 1,199 1,861 Substandard — — 18 — 17 — 223 258 Substandard Impaired — — 92 23 74 118 434 741 Doubtful — — — — — — — — Total 45,063 31,366 26,735 17,360 10,237 16,140 27,274 174,175 Paycheck Protection Program Risk Ratings: Pass 87,036 4,071 — — — — — 91,107 Total 87,036 4,071 — — — — — 91,107 Consolidated Risk Ratings: Pass 1,562,502 716,570 729,697 549,567 408,614 1,125,909 672,256 5,765,115 Special Mention 530 22,138 6,645 993 925 18,430 2,607 52,268 Substandard — 5,487 5,632 26,800 6,701 22,515 648 67,783 Substandard Impaired — 1,389 9,968 4,288 6,782 14,363 3,073 39,863 Doubtful — — — — — — — — Total $ 1,563,032 $ 745,584 $ 751,942 $ 581,648 $ 423,022 $ 1,181,217 $ 678,584 $ 5,925,029 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 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 were fully reserved as of December 31, 2020.
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, 2021: Construction and land development — $ — $ — Commercial real estate - owner-occupied — — — Commercial real estate - non owner-occupied — — — Residential real estate 5 261 261 Commercial and financial 3 457 457 Consumer 4 84 84 Totals 12 $ 802 $ 802 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 Commercial real estate - non owner-occupied — — — 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

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
Allowance for Credit Losses on Financing Receivables	Activity in the allowance for credit losses is summarized as follows: For the Year Ended December 31, 2021 (In thousands) Beginning Initial Allowance on PCD Loans Acquired During the Period Provision Charge- Recoveries TDR Ending Construction and land development $ 4,920 $ — $ (2,300) $ — $ 133 $ (2) $ 2,751 Commercial real estate - owner occupied 9,868 — (1,289) — — — 8,579 Commercial real estate - non-owner occupied 38,266 1,327 (1,664) (1,327) 15 — 36,617 Residential real estate 17,500 — (5,822) (57) 1,196 (6) 12,811 Commercial and financial 18,690 1,719 2,292 (3,987) 1,030 — 19,744 Consumer 3,489 — (638) (727) 697 (8) 2,813 Paycheck Protection Program — — — — — — — Total $ 92,733 $ 3,046 $ (9,421) $ (6,098) $ 3,071 $ (16) $ 83,315 For the Year Ended 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. For the Year Ended December 31, 2019 (In thousands) Beginning Provision Charge- Recoveries TDR Ending 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
Loan Portfolio and Related Allowance	The Company’s loan portfolio and related allowance at December 31, 2021 and 2020 is shown in the following tables. December 31, 2021 Individually Evaluated Collectively Evaluated Total (In thousands) Recorded Associated Recorded Associated Recorded Associated Construction and land development $ 271 $ 92 $ 230,553 $ 2,659 $ 230,824 $ 2,751 Commercial real estate - owner occupied 5,131 419 1,192,643 8,160 1,197,774 8,579 Commercial real estate - non-owner occupied 5,905 27 1,730,534 36,590 1,736,439 36,617 Residential real estate 16,345 646 1,409,009 12,165 1,425,354 12,811 Commercial and financial 11,470 2,885 1,057,886 16,859 1,069,356 19,744 Consumer 741 685 173,434 2,128 174,175 2,813 Paycheck Protection Program — — 91,107 — 91,107 — Total $ 39,863 $ 4,754 $ 5,885,166 $ 78,561 $ 5,925,029 $ 83,315 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

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	(In thousands) Notional Amount Fair Value Balance Sheet Category December 31, 2021 Back-to-back swaps $ 175,392 $ 8,022 Other Assets and Other Liabilities Interest rate floors 300,000 290 Other Assets December 31, 2020 Back-to-back swaps $ 182,379 $ 13,339 Other Assets and Other Liabilities Interest rate floors 300,000 1,004 Other Assets

Bank Premises and Equipment (Ta

Bank Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 Premises (including land of $23,359) $ 95,810 $ (30,913) $ 64,897 Furniture and equipment 34,044 (26,537) 7,507 Total $ 129,854 $ (57,450) $ 72,404 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

Goodwill and Acquired Intangi_2

Goodwill and Acquired Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2021
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) 2021 2020 2019 Beginning of year $ 221,176 $ 205,286 $ 204,753 Changes from business combinations 30,978 15,890 533 Total $ 252,154 $ 221,176 $ 205,286
Schedule of Core Deposit Intangibles	The change in balance for CDI is as follows: For the Year Ended December 31, (In thousands) 2021 2020 2019 Beginning of year $ 14,577 $ 18,305 $ 24,807 Acquired CDI, including measurement period adjustments 3,454 2,129 (676) Amortization expense (5,033) (5,857) (5,826) End of year $ 12,998 $ 14,577 $ 18,305 (In months) Remaining average amortization period for CDI 39 44 47
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, 2021 December 31, 2020 (In thousands) Gross Accumulated Gross Accumulated Core deposit intangible $ 41,596 $ (28,598) $ 38,144 $ (23,567)

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2021
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) 2021 2020 2019 Maximum amount outstanding at any month end $ 124,101 $ 119,609 $ 193,388 Weighted average interest rate at end of year 0.12 % 0.16 % 1.17 % Average amount outstanding $ 113,881 $ 84,514 $ 106,142 Weighted average interest rate during the year 0.12 % 0.33 % 1.35 %
Schedule of Collateral Dependent Loans	The following table presents collateral-dependent loans as of: (In thousands) December 31, 2021 December 31, 2020 Construction and land development $ 271 $ 189 Commercial real estate - owner-occupied 4,706 11,992 Commercial real estate - non-owner occupied 4,923 7,285 Residential real estate 16,334 16,652 Commercial and financial 8,741 11,198 Consumer 741 586 Totals $ 35,716 $ 47,902 December 31, (In thousands) 2021 2020 2019 Fair value of pledged securities - overnight and continuous: Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities $ 134,577 $ 137,268 $ 94,354
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, 2021: (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, 2021 SBCF Capital Trust I 3/31/2005 n/a 3/31/2035 $ 20,619 $ 20,000 $ 619 3 month LIBOR +175bps 1.97% SBCF Statutory Trust II 12/16/2005 n/a 12/16/2035 20,619 20,000 619 3 month LIBOR +133bps 1.53% SBCF Statutory Trust III 6/29/2007 n/a 6/15/2037 12,372 12,000 372 3 month LIBOR +135bps 1.55% BANKshares, Inc. Statutory Trust I 12/19/2002 10/1/2014 12/26/2032 5,155 5,000 155 3 month LIBOR +325bps 3.47% BANKshares, Inc. Statutory Trust II 3/17/2004 10/1/2014 3/17/2034 4,124 4,000 124 3 month LIBOR +279bps 3.01% BANKshares, Inc. Capital Trust I 12/15/2005 10/1/2014 12/15/2035 5,155 5,000 155 3 month LIBOR +139bps 1.55% Grand Bank Capital Trust I 10/29/2004 7/17/2015 10/29/2034 7,217 7,000 217 3 month LIBOR +198bps 2.11% $ 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, 2021
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) 2021 2020 2019 Share-based compensation expense 1 $ 8,685 $ 7,304 $ 7,244 Income tax benefit (2,067) (1,737) (1,723) 1 Excludes $0.9 million in 2021 associated with replacement options granted in the acquisition of Legacy Bank.
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, 2021 is presented below: (In thousands) Unrecognized Weighted-Average Period Remaining (Years) Restricted stock awards $ 7,645 1.71 Restricted stock units 3,282 2.07 Stock options — — Total $ 10,927 1.82
Schedule of Nonvested Share Activity	A summary of the status of the Company’s non-vested RSAs as of December 31, 2021, and changes during the year then ended, is presented below: Restricted Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2021 425,154 $ 20.03 Granted 218,695 35.08 Forfeited/Canceled (39,729) 21.72 Vested (205,416) 23.03 Non-vested at December 31, 2021 398,704 $ 26.68 A summary of the status of the Company’s non-vested RSUs as of December 31, 2021, and changes during the year then ended, is presented below: Restricted Weighted-Average Grant-Date Fair Value Non-vested at January 1, 2021 309,597 $ 23.54 Granted 103,073 35.24 Forfeited/Canceled (52,827) 25.83 Vested (74,622) 25.95 Non-vested at December 31, 2021 285,221 $ 26.71
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, 2021 2020 2019 Shares granted 218,695 379,869 157,861 Weighted-average grant date fair value $ 35.08 $ 18.36 $ 26.86 Fair value of awards vested 1 $ 4,731 $ 3,745 $ 4,128 1 Based on grant date fair value, in thousands For the Year Ended December 31, 2021 2020 2019 Shares granted 103,073 171,287 75,002 Weighted-average grant date fair value $ 35.24 $ 17.29 $ 30.02 Fair value of awards vested 1 $ 1,936 $ 2,962 $ 2,864 1 Based on grant date fair value, in thousands
Schedule of Stock Option Valuation Assumptions	The fair value of options granted is estimated on the date of grant using the Black-Scholes options-pricing model. In 2021, as part of the acquisition of Legacy Bank, the Company granted to each holder of Legacy Bank options, an option to purchase shares of Seacoast common stock on the same terms and conditions as the Legacy Bank option, with the number of shares and exercise price reflective of the conversion ratio specified in the merger agreement. The Company issued no stock options in 2020. For the Year Ended December 31, 2021 2020 2019 Risk-free interest rates 0.12 % n/a 2.53 % Expected dividend yield 1.65 % n/a — % Expected volatility 36.87 % n/a 34.50 % Expected lives (years) 1.0 n/a 5.0
Schedule of Stock Options Roll Forward	A summary of the Company’s stock options as of December 31, 2021, 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, 2021 839,884 $ 22.94 Granted 356,497 16.70 Exercised (384,035) 19.10 Forfeited (2,166) 18.65 Outstanding at December 31, 2021 810,180 $ 22.02 4.45 $ 10,829 Exercisable at December 31, 2021 810,180 $ 22.02 4.45 $ 10,829
Schedule of Stock Option Activity	nformation related to stock options during each of the following years: For the Year Ended December 31, 2021 2020 2019 Options granted 356,497 n/a 3,438 Weighted-average grant date fair value $ 16.70 n/a $ 28.42 Intrinsic value of stock options exercised, in thousands 5,808 830 277
Schedule of Options Outstanding and Remaining Contractual Life of Stock Options	The following table presents information related to stock options as of December 31, 2021: Range of Exercise Prices Options Remaining Options Weighted $5.88 to $14.82 300,299 2.2 300,299 $ 12.12 $15.80 to $28.69 331,814 5.5 331,814 26.09 $31.15 to $31.15 178,067 6.3 178,067 31.15 Total 810,180 4.5 810,180 $ 22.02
Schedule of Employee Stock Purchase Plan Activity	Employee contributions to the ESPP are made through payroll deductions. 2021 2020 2019 ESPP shares purchased 14,834 19,713 16,320 Weighted-average employee purchase price $ 32.43 $ 20.68 $ 25.39

Lease Commitments (Tables)

Lease Commitments (Tables)	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Schedule of Supplemental Lease Cost Information Related to Operating Leases	Lease cost consists of: For the Year Ended December 31, (In thousands) 2021 2020 2019 Operating lease cost $ 5,872 $ 5,738 $ 5,570 Variable lease cost 996 1,325 1,211 Short-term lease cost 564 497 715 Sublease income (601) (684) (618) Total lease cost $ 6,831 $ 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, (In thousands, except for weighted average data) 2021 2020 Operating lease right-of-use assets $ 35,256 $ 25,538 Operating lease liabilities 38,330 28,959 Cash paid during the year for amounts included in the measurement of operating lease liabilities 11,117 6,035 Right-of-use assets recorded during the year in exchange for new or renewed operating lease obligations 12,459 2,095 Right-of-use assets obtained during the year through bank acquisition 2,606 2,343 Weighted average remaining lease term for operating leases 8.3 years 8.5 years Weighted average discount rate for operating leases 4.25 % 4.62 %
Schedule of Maturities of Lease Liabilities	Maturities of lease liabilities as of December 31, 2021 are as follows: (In thousands) 2022 $ 6,597 2023 6,166 2024 6,032 2025 5,561 2026 4,869 Thereafter 15,505 Total undiscounted cash flows 44,730 Less: Net present value adjustment (6,400) Total $ 38,330

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
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) 2021 2020 2019 Current Federal $ 23,661 $ 21,688 $ 20,954 State 3,882 4,471 1,932 Deferred Federal 6,800 (2,697) 2,808 State (8) (644) 4,179 $ 34,335 $ 22,818 $ 29,873
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) 2021 2020 2019 Tax rate applied to income before income taxes $ 33,335 $ 21,122 $ 27,008 Increase (decrease) resulting from the effects of: Tax law change — (375) — Nondeductible acquisition costs 419 199 125 Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance (1,276) (1,110) (1,282) State income taxes (813) (804) (1,283) Tax credit investments (213) (72) (72) Stock compensation (1,239) (111) (698) Executive compensation disallowance 253 — — Other (5) 142 (36) Federal tax provision 30,461 18,991 23,762 State tax provision 3,874 3,827 6,111 Total income tax provision $ 34,335 $ 22,818 $ 29,873
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) 2021 2020 Allowance for credit losses $ 22,686 $ 24,158 Other real estate owned 52 422 Accrued stock compensation 2,323 1,973 Federal tax loss carryforward 2,138 2,857 State tax loss carryforward 1,226 1,333 Lease liabilities 9,399 7,101 Net unrealized securities losses 2,287 — Deferred compensation 3,276 2,565 Accrued interest and fee income — 995 Other 477 38 Gross deferred tax assets 43,864 41,442 Less: Valuation allowance — — Deferred tax assets net of valuation allowance 43,864 41,442 Core deposit base intangible (3,134) (3,234) Accrued interest and fee income (1,660) — Net unrealized securities gains — (5,890) Premises and equipment (776) (534) Right of use assets (8,645) (6,262) Other (2,328) (1,893) Gross deferred tax liabilities (16,543) (17,813) Net deferred tax assets $ 27,321 $ 23,629
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 2018 Florida 2018

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Summary of Required Regulatory Capital	At December 31, 2021 and 2020, 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, 2021: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 1,200,885 18.21 % n/a n/a $ 527,630 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 1,147,306 17.40 n/a n/a 395,723 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 1,075,656 16.31 n/a n/a 296,792 ≥ 4.50 Leverage Ratio (to adjusted average assets) 1,147,306 11.68 n/a n/a 392,763 ≥ 4.00 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 Seacoast National Bank (A Wholly Owned Bank Subsidiary) At December 31, 2021: Total Risk-Based Capital Ratio (to risk-weighted assets) $ 1,099,439 16.68 % $ 658,819 ≥ 10.00 % $ 527,055 ≥ 8.00 % Tier 1 Capital Ratio (to risk-weighted assets) 1,045,860 15.86 527,055 ≥ 8.00 395,291 ≥ 6.00 Common Equity Tier 1 Capital Ratio (to risk-weighted assets) 1,045,856 15.86 428,232 ≥ 6.50 296,468 ≥ 4.50 Leverage Ratio (to adjusted average assets) 1,045,860 10.65 490,798 ≥ 5.00 392,638 ≥ 4.00 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 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, 2021
Condensed Financial Information Disclosure [Abstract]
Summary of Balance Sheet	Balance Sheets December 31, (In thousands) 2021 2020 Assets Cash $ 57 $ 70 Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days 98,398 70,074 Investment in subsidiaries 1,286,478 1,134,536 Other assets 1,140 659 $ 1,386,073 $ 1,205,339 Liabilities and Shareholders' Equity Subordinated debt $ 71,646 $ 71,365 Other liabilities 3,795 3,676 Shareholders' equity 1,310,632 1,130,298 $ 1,386,073 $ 1,205,339
Summary of Statements of Income (Loss)	Statements of Income Year Ended December 31, (In thousands) 2021 2020 2019 Income Interest/other $ 167 $ 270 $ 679 Dividends from subsidiary Bank 47,684 20,230 18,084 Total income 47,851 20,500 18,763 Interest expense 1,683 2,236 3,368 Other expenses 765 838 651 Total expenses 2,448 3,074 4,019 Income before income taxes and equity in undistributed income of subsidiaries 45,403 17,426 14,744 Income tax benefit (481) (589) (702) Income before equity in undistributed income of subsidiaries 45,884 18,015 15,446 Equity in undistributed income of subsidiaries 78,519 59,749 83,293 Net income $ 124,403 $ 77,764 $ 98,739
Summary of Statement of Cash Flows	Statements of Cash Flows Year Ended December 31, (In thousands) 2021 2020 2019 Cash flows from operating activities Adjustments to reconcile net income to net cash provided Net Income $ 124,403 $ 77,764 $ 98,739 Equity in undistributed income of subsidiaries (78,519) (59,749) (83,293) Net (increase) decrease in other assets (489) 1,772 (738) Net increase (decrease) in other liabilities 400 256 265 Net cash provided by operating activities 45,795 20,043 14,973 Cash flows from investing activities Net cash paid for bank acquisition — (1,462) — Net (advances)/repayments with subsidiary (28,324) (17,095) (12,861) Net cash used in investment activities (28,324) (18,557) (12,861) Cash flows from financing activities Dividends paid (22,506) — — Stock based employment benefit plans 5,022 (1,486) (2,239) Net cash used in financing activities (17,484) (1,486) (2,239) Net change in cash (13) — (127) Cash at beginning of year 70 70 197 Cash at end of year $ 57 $ 70 $ 70 Supplemental disclosure of cash flow information: Cash paid during the period for interest $ 1,441 $ 1,992 $ 3,186

Contingent Liabilities and Co_2

Contingent Liabilities and Commitments with Off-Balance Sheet Risk (Tables)	12 Months Ended
	Dec. 31, 2021
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) 2021 2020 Contract or Notional Amount Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ 1,980,338 $ 1,548,482 Standby letters of credit and financial guarantees written: Secured 12,091 11,167 Unsecured 1,189 1,197 Unfunded limited partner equity commitment 36,393 21,390

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 and December 31, 2020 included: Fair Value Quoted Prices in Significant Other Significant Other (In thousands) Measurements Level 1 Level 2 Level 3 At December 31, 2021 Financial Assets Available-for-sale debt securities 1 $ 1,644,319 $ 197 $ 1,644,122 $ — Derivative financial instruments 2 8,312 — 8,312 — Loans held for sale 2 31,791 — 31,791 — Loans 3 8,443 — 1,558 6,885 Other real estate owned 4 13,618 — — 13,618 Equity securities 5 9,316 9,316 — — Financial Liabilities Derivative financial instruments 2 $ 8,022 $ — $ 8,022 $ — 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 — 1 See “Note 3 - Securities” for further detail of fair value of individual investment categories. 2 Recurring fair value basis determined using observable market data. 3 See “Note 4 - 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, 2021 and 2020 is as follows: December 31, (In thousands) 2021 2020 Aggregate fair value $ 31,791 $ 68,890 Contractual balance 30,963 66,415 Excess 828 2,475
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, 2021 and December 31, 2020 is as follows: Carrying Quoted Prices in Significant Other Significant Other (In thousands) Amount Level 1 Level 2 Level 3 At December 31, 2021 Financial Assets Held-to-maturity debt securities 1 $ 638,640 $ — $ 627,398 $ — Loans, net 5,833,271 — — 5,907,447 Financial Liabilities Deposits 8,067,589 — — 8,067,995 Subordinated debt 71,646 — 69,348 — 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 — 1 See “Note 3 - Securities” for further detail of recurring fair value basis of individual investment categories.

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2021
Business Combinations [Abstract]
Summary of Purchase Price Calculation	The Company acquired 100% of the outstanding common stock of Legacy Bank. Under the terms of the definitive agreement, each share of Legacy Bank common stock was converted into the right to receive 0.1703 share of Seacoast common stock. (In thousands, except per share data) August 6, 2021 Number of Legacy Bank common shares outstanding $ 15,778 Per share exchange ratio 0.1703 Number of shares of common stock issued 2,687 Multiplied by common stock price per share on August 6, 2021 $ 32.19 Value of common stock issued 86,487 Cash paid for fractional shares 7 Fair value of options converted 4,736 Total purchase price $ 91,230 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 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 (In thousands, except per share data) January 3, 2022 Number of BBFC common shares outstanding 1,112 Per share exchange ratio 0.7997 Number of shares of common stock issued 889 Multiplied by common stock price per share on January 3, 2022 $ 35.39 Value of common stock issued 31,480 Fair value of options converted 497 Total purchase price $ 31,977 The Company acquired 100% of the outstanding common stock of Sabal Palm. Under the terms of the definitive agreement, each share of Sabal Palm common stock was converted into the right to receive 0.2203 share of Seacoast common stock. (In thousands, except per share data) January 3, 2022 Number of Sabal Palm common shares outstanding 7,536 Per share exchange ratio 0.2203 Number of shares of common stock issued 1,660 Multiplied by common stock price per share on January 3, 2022 $ 35.39 Value of common stock issued 58,762 Fair value of options converted 3,336 Total purchase price $ 62,098
Schedule of Business Acquisitions	(In thousands) Initially Measured Assets: Cash $ 98,107 Investment securities 992 Loans 477,215 Bank premises and equipment 2,577 Core deposit intangibles 3,454 Goodwill 30,978 Other assets 15,532 Total assets $ 628,855 Liabilities: Deposits 494,921 Other liabilities 42,705 Total liabilities $ 537,626 (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
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 6, 2021 (In thousands) Book Balance Fair Value Loans: Construction and land development $ 37,558 $ 36,651 Commercial real estate - owner-occupied 35,765 35,363 Commercial real estate - non owner-occupied 241,322 237,091 Residential real estate 71,118 70,541 Commercial and financial 61,274 58,324 Consumer 647 647 PPP loans 38,598 38,598 Total acquired loans $ 486,282 $ 477,215 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
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 6, 2021 Book balance of loans at acquisition $ 66,371 Allowance for credit losses at acquisition (3,046) Non-credit related discount (736) Total PCD loans acquired $ 62,589 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 The acquisition of FBPB resulted in the addition of $2.3 million in allowance for credit losses, including the $0.5 million identified in the table above for PCD loans, and $1.8 million for non-PCD loans recorded through the provision for credit losses at the date of acquisition.
Summary of Pro-Forma Data	Pro-forma data as of 2021 and 2020 present information as if the acquisition of Legacy Bank occurred at the beginning of 2020: Twelve Months Ended (In thousands, except per share data) 2021 2020 Net interest income $ 288,971 $ 281,244 Net income available to common shareholders 140,851 71,124 EPS - basic $ 2.41 $ 1.27 EPS - diluted $ 2.39 $ 1.26

Significant Accounting Polici_3

Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021operating_segment
Accounting Policies [Line Items]
Number of operating segments	1
Stock options
Accounting Policies [Line Items]
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

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Shares excluded from computation of diluted EPS (in shares)	0	508	491
Basic earnings per share
Net Income	$ 124,403	$ 77,764	$ 98,739
Total weighted average common stock outstanding (in shares)	56,586	53,502	51,449
Net income per share (in dollars per share)	$ 2.20	$ 1.45	$ 1.92
Diluted earnings per share
Net Income	$ 124,403	$ 77,764	$ 98,739
Total weighted average common stock outstanding (in shares)	56,586	53,502	51,449
Add: Dilutive effect of employee restricted stock and stock options (See “Note 10 - Employee Benefits and Stock Compensation”) (in shares)	502	428	580
Total weighted average diluted stock outstanding (in shares)	57,088	53,930	52,029
Net income per share (in dollars per share)	$ 2.18	$ 1.44	$ 1.90

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, 2021	Dec. 31, 2020
Debt securities available-for-sale
Available for sale, amortized cost, total	$ 1,653,658	$ 1,371,539
Available for sale, gross unrealized gains	11,518	28,716
Available for sale, gross unrealized losses	(20,857)	(2,098)
Available for sale, fair value	1,644,319	1,398,157
Debt securities held-to-maturity
Held to maturity, amortized cost, total	638,640	184,484
Held to maturity, gross unrealized gains	3,828	7,818
Held to maturity, gross unrealized losses	(15,070)	(123)
Held to maturity, fair value	627,398	192,179
U.S. Treasury securities and obligations of U.S. government agencies
Debt securities available-for-sale
Available for sale, amortized cost, total	6,466	8,250
Available for sale, gross unrealized gains	316	528
Available for sale, gross unrealized losses	(3)	(1)
Available for sale, fair value	6,779	8,777
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Debt securities available-for-sale
Available for sale, amortized cost, total	1,234,721	1,038,437
Available for sale, gross unrealized gains	8,308	23,457
Available for sale, gross unrealized losses	(20,309)	(1,240)
Available for sale, fair value	1,222,720	1,060,654
Debt securities held-to-maturity
Held to maturity, amortized cost, total	638,640	184,484
Held to maturity, gross unrealized gains	3,828	7,818
Held to maturity, gross unrealized losses	(15,070)	(123)
Held to maturity, fair value	627,398	192,179
Private mortgage-backed securities and collateralized mortgage obligations
Debt securities available-for-sale
Available for sale, amortized cost, total	88,096	89,284
Available for sale, gross unrealized gains	1,091	2,131
Available for sale, gross unrealized losses	(420)	(210)
Available for sale, fair value	88,767	91,205
Debt securities held-to-maturity
Held to maturity, fair value	0
Collateralized loan obligations
Debt securities available-for-sale
Available for sale, amortized cost, total	292,751	202,563
Available for sale, gross unrealized gains	63	279
Available for sale, gross unrealized losses	(124)	(647)
Available for sale, fair value	292,690	202,195
Debt securities held-to-maturity
Held to maturity, fair value	0
Obligations of state and political subdivisions
Debt securities available-for-sale
Available for sale, amortized cost, total	31,624	33,005
Available for sale, gross unrealized gains	1,740	2,321
Available for sale, gross unrealized losses	(1)	0
Available for sale, fair value	$ 33,363	$ 35,326

Securities - Additional Informa

Securities - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale of available-for-sale debt securities, including legacy securities		$ 102,100	$ 96,700	$ 202,700
Gross gains from sale of securities		300	2,400	2,900
Gross losses from sale of securities		600	1,300	1,800
Securities transferred from available for sale to held to maturity	$ 210,800
Securities transferred from available for sale to held to maturity, net realized gains	$ 800
Unrealized losses		(20,857)	(2,098)
Fair value of mortgage backed securities of government sponsored entities		1,144,606	405,437
Other assets of Federal Home Loan Bank and Federal Reserve Bank		34,400
Accrued interest receivable on AFS debt securities		3,400	3,200
Accrued interest receivable on HTM debt securities		1,000	400
Other assets		$ 201,857	$ 162,214
Shares held (in shares)		58,504,250	55,243,226
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)		$ 1.6181
Shares of class A Visa stock issued (in shares)		18,333
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses		$ (20,309)	$ (1,240)
Fair value of mortgage backed securities of government sponsored entities		967,834	203,974
Held-to-maturity securities, allowance for credit loss		0
Private mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Unrealized losses		(420)	(210)
Fair value of mortgage backed securities of government sponsored entities		$ 43,268	23,997
Average credit support percentage		23.00%
Allowance for credit losses on AFS debt securities		$ 0
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Unrealized losses		(124)	(647)
Fair value of mortgage backed securities of government sponsored entities		132,663	177,210
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		37.00%
Collateralized loan obligations | Standard & Poor's, AA Rating
Debt Securities, Available-for-sale [Line Items]
Number of positions held, percentage of total		25.00%
CRA - qualified debt securities
Debt Securities, Available-for-sale [Line Items]
Gross gains from sale of securities			100	$ 200
Gross losses from sale of securities		$ 200
Carrying Value
Debt Securities, Available-for-sale [Line Items]
Other assets		9,300	$ 6,500
Carrying Value | Public deposits and secured borrowings
Debt Securities, Available-for-sale [Line Items]
Securities pledged as collateral		$ 421,400

Securities - Amortized Cost a_2

Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amortized Cost
Held to maturity, amortized cost, total	$ 638,640	$ 184,484
Fair Value
Held to maturity, fair value, total	627,398	192,179
Amortized Cost
Available for sale, amortized cost, total	1,653,658	1,371,539
Fair Value
Available for sale, fair value, total	1,644,319	1,398,157
Other debt
Amortized Cost
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
Fair Value
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
Amortized Cost
Available for sale, amortized cost, due in less than one year	2,174
Available for sale, amortized cost, due after one year through five years	14,017
Available for sale, amortized cost, due after five years through ten years	7,041
Available for sale, amortized cost, due after ten years	14,858
Available for sale, amortized cost, total	38,090
Fair Value
Available for sale, fair value, due in less than one year	2,210
Available for sale, fair value, due after one year through five years	14,841
Available for sale, fair value, due after five years through ten years	7,341
Available for sale, fair value, due after ten years	15,750
Available for sale, fair value, total	40,142
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Amortized Cost
Held to maturity, amortized cost, total	638,640
Fair Value
Held to maturity, fair value, total	627,398	192,179
Amortized Cost
Available for sale, amortized cost, total	1,234,721	1,038,437
Fair Value
Available for sale, fair value, total	1,222,720	1,060,654
Private mortgage-backed securities and collateralized mortgage obligations
Amortized Cost
Held to maturity, amortized cost, total	0
Fair Value
Held to maturity, fair value, total	0
Amortized Cost
Available for sale, amortized cost, total	88,096	89,284
Fair Value
Available for sale, fair value, total	88,767	91,205
Collateralized loan obligations
Amortized Cost
Held to maturity, amortized cost, total	0
Fair Value
Held to maturity, fair value, total	0
Amortized Cost
Available for sale, amortized cost, total	292,751	202,563
Fair Value
Available for sale, fair value, total	$ 292,690	$ 202,195

Securities - Schedule of Unreal

Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value
Less Than 12 Months	$ 1,113,319	$ 332,099
12 Months or Longer	31,287	73,338
Total	1,144,606	405,437
Unrealized Losses
Less Than 12 Months	(19,831)	(1,530)
12 Months or Longer	(1,026)	(568)
Total	(20,857)	(2,098)
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less Than 12 Months	97	0
12 Months or Longer	245	256
Total	342	256
Unrealized Losses
Less Than 12 Months	(1)	0
12 Months or Longer	(2)	(1)
Total	(3)	(1)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	955,881	203,405
12 Months or Longer	11,953	569
Total	967,834	203,974
Unrealized Losses
Less Than 12 Months	(19,575)	(1,218)
12 Months or Longer	(734)	(22)
Total	(20,309)	(1,240)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	33,640	23,997
12 Months or Longer	9,628	0
Total	43,268	23,997
Unrealized Losses
Less Than 12 Months	(173)	(210)
12 Months or Longer	(247)	0
Total	(420)	(210)
Collateralized loan obligations
Fair Value
Less Than 12 Months	123,202	104,697
12 Months or Longer	9,461	72,513
Total	132,663	177,210
Unrealized Losses
Less Than 12 Months	(81)	(102)
12 Months or Longer	(43)	(545)
Total	(124)	$ (647)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months	499
12 Months or Longer	0
Total	499
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, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 5,925,029	$ 5,735,349
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	230,824	245,108
Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,197,774	1,141,310
Commercial real estate - non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,736,439	1,395,854
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,425,354	1,342,628
Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,069,356	854,753
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	174,175	188,735
Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	91,107	566,961
Acquired Non-PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	868,418	925,434
Acquired Non-PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	31,438	26,250
Acquired Non-PCD Loans | Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	186,812	247,090
Acquired Non-PCD Loans | Commercial real estate - non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	382,554	323,273
Acquired Non-PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	156,957	176,105
Acquired Non-PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	84,395	94,627
Acquired Non-PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,658	6,660
Acquired Non-PCD Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	21,604	51,429
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	126,939	98,178
PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	45	2,438
PCD Loans | Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	27,445	39,451
PCD Loans | Commercial real estate - non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	75,705	29,122
PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	7,091	10,609
PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	16,643	16,280
PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	10	278
PCD Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,929,672	4,711,737
Portfolio Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	199,341	216,420
Portfolio Loans | Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	983,517	854,769
Portfolio Loans | Commercial real estate - non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,278,180	1,043,459
Portfolio Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,261,306	1,155,914
Portfolio Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	968,318	743,846
Portfolio Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	169,507	181,797
Portfolio Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 69,503	$ 515,532

Loans - Additional Information

Loans - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021USD ($)contract	Dec. 31, 2020USD ($)contract	Dec. 31, 2019USD ($)	Jun. 30, 2020USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net deferred costs		$ 22,600,000
Remaining fair value adjustment for loans acquired	$ 23,100,000	$ 30,200,000
Percentage of fair value adjustment for loans acquired	2.30%	2.90%
Accrued interest receivable	$ 14,700,000	$ 25,800,000
Loans to directors and executive officers	600,000	1,100,000
New loans offered	2
Interest income on nonaccrual loans	1,200,000	900,000	$ 1,300,000
Value of loans deferred, not classified as TDRs	$ 1,200,000	$ 74,100,000
Percentage of loans receiving accomodations	0.02%	1.00%
Allowance for credit loss on TDRs	$ 200,000	$ 200,000
Number of loans under trouble debt restructuring | contract	3	0
Value of loans under trouble debt restructuring modified in preceding twelve months	$ 200,000
Interest income related to impaired loans with impairment measured on present value of expected future cash flows	16,000	$ 100,000	$ 100,000
Portfolio Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net deferred costs	31,000,000
Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Value of loans deferred, not classified as TDRs				$ 1,100,000,000
Percentage of loans receiving accomodations				21.00%
Paycheck Protection Program | Portfolio Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net deferred fees	$ 2,400,000	$ 9,500,000

Loans - Past Due Financing Rece

Loans - Past Due Financing Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Loans	$ 5,925,029	$ 5,735,349
Nonaccrual	30,598	36,110
Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	868,418	925,434
Nonaccrual	3,454	7,690
PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	126,939	98,178
Nonaccrual	11,322	10,150
Current
Financing Receivable, Past Due [Line Items]
Loans	5,888,713	5,689,158
Current | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	864,410	915,799
Current | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	115,617	87,903
Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	5,190	6,382
Accruing 30-59 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	317	1,841
Accruing 30-59 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	125
Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	407	3,636
Accruing 60-89 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	200	104
Accruing 60-89 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Loans	121	63
Accruing Greater Than 90 Days | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	37	0
Accruing Greater Than 90 Days | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Construction and land development
Financing Receivable, Past Due [Line Items]
Loans	230,824	245,108
Nonaccrual	259	167
Construction and land development | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	31,438	26,250
Nonaccrual	0	0
Construction and land development | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	45	2,438
Nonaccrual	5	9
Construction and land development | Current | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	31,438	26,250
Construction and land development | Current | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	40	2,429
Construction and land development | Accruing 30-59 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Construction and land development | Accruing 30-59 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Construction and land development | Accruing 60-89 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Construction and land development | Accruing 60-89 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Construction and land development | Accruing Greater Than 90 Days | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Construction and land development | Accruing Greater Than 90 Days | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Loans	1,197,774	1,141,310
Nonaccrual	3,966	8,181
Commercial real estate - owner occupied | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	186,812	247,090
Nonaccrual	0	2,604
Commercial real estate - owner occupied | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	27,445	39,451
Nonaccrual	3,253	3,106
Commercial real estate - owner occupied | Current | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	186,652	244,486
Commercial real estate - owner occupied | Current | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	24,192	36,345
Commercial real estate - owner occupied | Accruing 30-59 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate - owner occupied | Accruing 30-59 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate - owner occupied | Accruing 60-89 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	160	0
Commercial real estate - owner occupied | Accruing 60-89 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate - owner occupied | Accruing Greater Than 90 Days | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate - owner occupied | Accruing Greater Than 90 Days | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	1,736,439	1,395,854
Nonaccrual	5,905	8,084
Commercial real estate - non-owner occupied | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	382,554	323,273
Nonaccrual	1,044	1,009
Commercial real estate - non-owner occupied | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	75,705	29,122
Nonaccrual	3,263	4,922
Commercial real estate - non-owner occupied | Current | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	381,510	322,264
Commercial real estate - non-owner occupied | Current | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	72,442	24,200
Commercial real estate - non-owner occupied | Accruing 30-59 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate - non-owner occupied | Accruing 30-59 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate - non-owner occupied | Accruing 60-89 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate - non-owner occupied | Accruing 60-89 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate - non-owner occupied | Accruing Greater Than 90 Days | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate - non-owner occupied | Accruing Greater Than 90 Days | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Residential real estate
Financing Receivable, Past Due [Line Items]
Loans	1,425,354	1,342,628
Nonaccrual	13,045	12,492
Residential real estate | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	156,957	176,105
Nonaccrual	1,794	2,889
Residential real estate | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	7,091	10,609
Nonaccrual	1,705	1,072
Residential real estate | Current | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	154,981	171,507
Residential real estate | Current | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	5,386	9,537
Residential real estate | Accruing 30-59 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	182	1,605
Residential real estate | Accruing 30-59 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Residential real estate | Accruing 60-89 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	104
Residential real estate | Accruing 60-89 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Residential real estate | Accruing Greater Than 90 Days | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Residential real estate | Accruing Greater Than 90 Days | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial and financial
Financing Receivable, Past Due [Line Items]
Loans	1,069,356	854,753
Nonaccrual	6,869	6,604
Commercial and financial | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	84,395	94,627
Nonaccrual	175	1,188
Commercial and financial | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	16,643	16,280
Nonaccrual	3,096	1,034
Commercial and financial | Current | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	84,180	93,223
Commercial and financial | Current | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	13,547	15,121
Commercial and financial | Accruing 30-59 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	216
Commercial and financial | Accruing 30-59 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	125
Commercial and financial | Accruing 60-89 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	40	0
Commercial and financial | Accruing 60-89 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial and financial | Accruing Greater Than 90 Days | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial and financial | Accruing Greater Than 90 Days | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Consumer
Financing Receivable, Past Due [Line Items]
Loans	174,175	188,735
Nonaccrual	554	582
Consumer | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	4,658	6,660
Nonaccrual	441	0
Consumer | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	10	278
Nonaccrual	0	7
Consumer | Current | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	4,082	6,640
Consumer | Current | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	10	271
Consumer | Accruing 30-59 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	135	20
Consumer | Accruing 30-59 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Consumer | Accruing 60-89 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Consumer | Accruing 60-89 Days Past Due | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Consumer | Accruing Greater Than 90 Days | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Consumer | Accruing Greater Than 90 Days | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Loans	91,107	566,961
Paycheck Protection Program | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	21,604	51,429
Nonaccrual	0	0
Paycheck Protection Program | PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Paycheck Protection Program | Current | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	21,567	51,429
Paycheck Protection Program | Accruing 30-59 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Paycheck Protection Program | Accruing 60-89 Days Past Due | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Paycheck Protection Program | Accruing Greater Than 90 Days | Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Loans	37	0
Portfolio Loans
Financing Receivable, Past Due [Line Items]
Loans	4,929,672	4,711,737
Nonaccrual	15,822	18,270
Portfolio Loans | Current
Financing Receivable, Past Due [Line Items]
Loans	4,908,686	4,685,456
Portfolio Loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	4,873	4,416
Portfolio Loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	207	3,532
Portfolio Loans | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Loans	84	63
Portfolio Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Loans	199,341	216,420
Nonaccrual	254	158
Portfolio Loans | Construction and land development | Current
Financing Receivable, Past Due [Line Items]
Loans	199,087	216,262
Portfolio Loans | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Portfolio Loans | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Portfolio Loans | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Loans	0	0
Portfolio Loans | Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Loans	983,517	854,769
Nonaccrual	713	2,471
Portfolio Loans | Commercial real estate - owner occupied | Current
Financing Receivable, Past Due [Line Items]
Loans	982,804	851,222
Portfolio Loans | Commercial real estate - owner occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	1,076
Portfolio Loans | Commercial real estate - owner occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Portfolio Loans | Commercial real estate - owner occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Loans	0	0
Portfolio Loans | Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	1,278,180	1,043,459
Nonaccrual	1,598	2,153
Portfolio Loans | Commercial real estate - non-owner occupied | Current
Financing Receivable, Past Due [Line Items]
Loans	1,276,582	1,041,306
Portfolio Loans | Commercial real estate - non-owner occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Portfolio Loans | Commercial real estate - non-owner occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Portfolio Loans | Commercial real estate - non-owner occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Loans	0	0
Portfolio Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans	1,261,306	1,155,914
Nonaccrual	9,546	8,531
Portfolio Loans | Residential real estate | Current
Financing Receivable, Past Due [Line Items]
Loans	1,248,160	1,142,893
Portfolio Loans | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,457	3,002
Portfolio Loans | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	143	1,427
Portfolio Loans | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Loans	0	61
Portfolio Loans | Commercial and financial
Financing Receivable, Past Due [Line Items]
Loans	968,318	743,846
Nonaccrual	3,598	4,382
Portfolio Loans | Commercial and financial | Current
Financing Receivable, Past Due [Line Items]
Loans	963,828	737,362
Portfolio Loans | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	851	135
Portfolio Loans | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	41	1,967
Portfolio Loans | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Loans	0	0
Portfolio Loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans	169,507	181,797
Nonaccrual	113	575
Portfolio Loans | Consumer | Current
Financing Receivable, Past Due [Line Items]
Loans	168,791	180,879
Portfolio Loans | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	565	203
Portfolio Loans | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	23	138
Portfolio Loans | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Loans	15	2
Portfolio Loans | Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Loans	69,503	515,532
Nonaccrual	0	0
Portfolio Loans | Paycheck Protection Program | Current
Financing Receivable, Past Due [Line Items]
Loans	69,434	515,532
Portfolio Loans | Paycheck Protection Program | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Portfolio Loans | Paycheck Protection Program | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Portfolio Loans | Paycheck Protection Program | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Loans	$ 69	$ 0

Loans - Schedule of Nonaccrual

Loans - Schedule of Nonaccrual Loans by Loan Category (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	$ 22,566	$ 26,624
Nonaccrual loans with allowance for credit losses	8,032	9,486
Nonaccrual loans with no related allowance for credit losses, total loans	30,598	36,110
Nonaccrual loans, allowance for credit losses	3,804	5,832
Construction and land development
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	37	148
Nonaccrual loans with allowance for credit losses	222	19
Nonaccrual loans with no related allowance for credit losses, total loans	259	167
Nonaccrual loans, allowance for credit losses	92	8
Commercial real estate - owner occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	2,976	7,893
Nonaccrual loans with allowance for credit losses	990	288
Nonaccrual loans with no related allowance for credit losses, total loans	3,966	8,181
Nonaccrual loans, allowance for credit losses	419	287
Commercial real estate - non-owner occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	4,490	5,666
Nonaccrual loans with allowance for credit losses	1,415	2,418
Nonaccrual loans with no related allowance for credit losses, total loans	5,905	8,084
Nonaccrual loans, allowance for credit losses	27	1,640
Residential real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	12,358	9,520
Nonaccrual loans with allowance for credit losses	687	2,972
Nonaccrual loans with no related allowance for credit losses, total loans	13,045	12,492
Nonaccrual loans, allowance for credit losses	357	1,587
Commercial and financial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	2,676	3,175
Nonaccrual loans with allowance for credit losses	4,193	3,429
Nonaccrual loans with no related allowance for credit losses, total loans	6,869	6,604
Nonaccrual loans, allowance for credit losses	2,384	2,235
Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with no related allowance for credit losses	29	222
Nonaccrual loans with allowance for credit losses	525	360
Nonaccrual loans with no related allowance for credit losses, total loans	554	582
Nonaccrual loans, allowance for credit losses	$ 525	$ 75

Loans - Schedule of Collateral

Loans - Schedule of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	$ 35,716	$ 47,902
Construction and land development
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	271	189
Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	4,706	11,992
Commercial real estate - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	4,923	7,285
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	16,334	16,652
Commercial and financial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	8,741	11,198
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total collateral dependent loans	$ 741	$ 586

Loans - Risk Categories of Loan

Loans - Risk Categories of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 1,563,032	$ 1,309,434
One year prior to current fiscal year	745,584	912,701
Two years prior to current fiscal year	751,942	779,840
Three years prior to current fiscal year	581,648	589,022
Four years prior to current fiscal year	423,022	582,417
Prior	1,181,217	928,105
Revolving	678,584	633,830
Total	5,925,029	5,735,349
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,562,502	1,302,389
One year prior to current fiscal year	716,570	898,213
Two years prior to current fiscal year	729,697	741,734
Three years prior to current fiscal year	549,567	562,336
Four years prior to current fiscal year	408,614	553,531
Prior	1,125,909	885,576
Revolving	672,256	628,070
Total	5,765,115	5,571,849
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	530	6,108
One year prior to current fiscal year	22,138	3,507
Two years prior to current fiscal year	6,645	19,722
Three years prior to current fiscal year	993	13,953
Four years prior to current fiscal year	925	14,820
Prior	18,430	7,235
Revolving	2,607	2,544
Total	52,268	67,889
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	504
One year prior to current fiscal year	5,487	41
Two years prior to current fiscal year	5,632	12,725
Three years prior to current fiscal year	26,800	7,256
Four years prior to current fiscal year	6,701	10,823
Prior	22,515	14,083
Revolving	648	1,092
Total	67,783	46,524
Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	433
One year prior to current fiscal year	1,389	10,940
Two years prior to current fiscal year	9,968	5,659
Three years prior to current fiscal year	4,288	5,477
Four years prior to current fiscal year	6,782	3,243
Prior	14,363	21,211
Revolving	3,073	2,104
Total	39,863	49,067
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	20
Total	0	20
Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	94,318	62,313
One year prior to current fiscal year	23,860	52,629
Two years prior to current fiscal year	38,058	51,985
Three years prior to current fiscal year	25,729	15,910
Four years prior to current fiscal year	3,995	7,335
Prior	15,515	19,612
Revolving	29,349	35,324
Total	230,824	245,108
Construction and land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	94,318	62,107
One year prior to current fiscal year	23,860	52,384
Two years prior to current fiscal year	38,058	46,067
Three years prior to current fiscal year	25,507	15,873
Four years prior to current fiscal year	3,995	7,335
Prior	15,466	17,873
Revolving	29,349	35,324
Total	230,553	236,963
Construction and land development | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	206
One year prior to current fiscal year	0	245
Two years prior to current fiscal year	0	5,918
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	1,449
Revolving	0	0
Total	0	7,818
Construction and land development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	51
Revolving	0	0
Total	0	51
Construction and land development | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	222	37
Four years prior to current fiscal year	0	0
Prior	49	239
Revolving	0	0
Total	271	276
Construction and land development | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	0	0
Commercial real estate - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	205,404	161,726
One year prior to current fiscal year	160,959	203,568
Two years prior to current fiscal year	187,898	160,328
Three years prior to current fiscal year	133,312	144,412
Four years prior to current fiscal year	129,867	154,815
Prior	370,329	302,204
Revolving	10,005	14,257
Total	1,197,774	1,141,310
Commercial real estate - owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	205,404	155,953
One year prior to current fiscal year	154,432	198,559
Two years prior to current fiscal year	179,786	156,276
Three years prior to current fiscal year	132,353	138,341
Four years prior to current fiscal year	125,763	148,389
Prior	363,986	287,772
Revolving	10,005	14,255
Total	1,171,729	1,099,545
Commercial real estate - owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	5,773
One year prior to current fiscal year	6,527	1,858
Two years prior to current fiscal year	5,370	3,305
Three years prior to current fiscal year	649	0
Four years prior to current fiscal year	218	4,471
Prior	3,250	4,050
Revolving	0	2
Total	16,014	19,459
Commercial real estate - owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	4,709
Four years prior to current fiscal year	3,290	1,955
Prior	1,610	5,508
Revolving	0	0
Total	4,900	12,172
Commercial real estate - owner occupied | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	3,151
Two years prior to current fiscal year	2,742	747
Three years prior to current fiscal year	310	1,362
Four years prior to current fiscal year	596	0
Prior	1,483	4,874
Revolving	0	0
Total	5,131	10,134
Commercial real estate - owner occupied | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	0	0
Commercial real estate - non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	395,308	159,299
One year prior to current fiscal year	213,644	316,136
Two years prior to current fiscal year	303,723	220,308
Three years prior to current fiscal year	209,545	130,937
Four years prior to current fiscal year	113,505	194,299
Prior	494,237	366,279
Revolving	6,477	8,596
Total	1,736,439	1,395,854
Commercial real estate - non-owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	395,308	159,299
One year prior to current fiscal year	207,824	313,287
Two years prior to current fiscal year	298,021	201,112
Three years prior to current fiscal year	186,339	123,357
Four years prior to current fiscal year	110,990	175,623
Prior	460,435	356,943
Revolving	6,477	8,596
Total	1,665,394	1,338,217
Commercial real estate - non-owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	431
Two years prior to current fiscal year	844	9,487
Three years prior to current fiscal year	0	7,580
Four years prior to current fiscal year	289	10,240
Prior	13,850	114
Revolving	0	0
Total	14,983	27,852
Commercial real estate - non-owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	4,776	0
Two years prior to current fiscal year	3,009	9,709
Three years prior to current fiscal year	23,206	0
Four years prior to current fiscal year	1,900	8,311
Prior	17,266	3,682
Revolving	0	0
Total	50,157	21,702
Commercial real estate - non-owner occupied | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	1,044	2,418
Two years prior to current fiscal year	1,849	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	326	125
Prior	2,686	5,540
Revolving	0	0
Total	5,905	8,083
Commercial real estate - non-owner occupied | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	0	0
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	394,547	97,278
One year prior to current fiscal year	114,853	145,055
Two years prior to current fiscal year	91,290	205,630
Three years prior to current fiscal year	119,945	208,424
Four years prior to current fiscal year	123,029	161,327
Prior	224,122	171,831
Revolving	357,568	353,083
Total	1,425,354	1,342,628
Residential real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	394,547	96,819
One year prior to current fiscal year	114,364	144,329
Two years prior to current fiscal year	90,566	204,077
Three years prior to current fiscal year	119,836	205,046
Four years prior to current fiscal year	118,556	160,612
Prior	213,950	159,742
Revolving	354,439	350,502
Total	1,406,258	1,321,127
Residential real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	33
Three years prior to current fiscal year	70	720
Four years prior to current fiscal year	0	0
Prior	1,243	966
Revolving	532	479
Total	1,845	2,198
Residential real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	350
One year prior to current fiscal year	340	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	896
Four years prior to current fiscal year	58	0
Prior	422	1,452
Revolving	86	100
Total	906	2,798
Residential real estate | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	109
One year prior to current fiscal year	149	726
Two years prior to current fiscal year	724	1,520
Three years prior to current fiscal year	39	1,762
Four years prior to current fiscal year	4,415	715
Prior	8,507	9,671
Revolving	2,511	2,002
Total	16,345	16,505
Residential real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	0	0
Commercial and financial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	341,356	215,316
One year prior to current fiscal year	196,831	152,093
Two years prior to current fiscal year	104,238	110,949
Three years prior to current fiscal year	75,757	70,295
Four years prior to current fiscal year	42,389	42,386
Prior	60,874	58,336
Revolving	247,911	205,378
Total	1,069,356	854,753
Commercial and financial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	340,826	214,774
One year prior to current fiscal year	180,677	146,511
Two years prior to current fiscal year	97,072	103,769
Three years prior to current fiscal year	68,232	60,782
Four years prior to current fiscal year	39,331	39,692
Prior	56,053	53,758
Revolving	246,568	204,304
Total	1,028,759	823,590
Commercial and financial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	530	71
One year prior to current fiscal year	15,587	946
Two years prior to current fiscal year	0	965
Three years prior to current fiscal year	237	5,612
Four years prior to current fiscal year	251	67
Prior	84	635
Revolving	876	209
Total	17,565	8,505
Commercial and financial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	154
One year prior to current fiscal year	371	41
Two years prior to current fiscal year	2,605	3,016
Three years prior to current fiscal year	3,594	1,609
Four years prior to current fiscal year	1,436	553
Prior	3,217	3,239
Revolving	339	764
Total	11,562	9,376
Commercial and financial | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	317
One year prior to current fiscal year	196	4,595
Two years prior to current fiscal year	4,561	3,199
Three years prior to current fiscal year	3,694	2,292
Four years prior to current fiscal year	1,371	2,074
Prior	1,520	704
Revolving	128	81
Total	11,470	13,262
Commercial and financial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	20
Total	0	20
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	45,063	46,541
One year prior to current fiscal year	31,366	43,220
Two years prior to current fiscal year	26,735	30,640
Three years prior to current fiscal year	17,360	19,044
Four years prior to current fiscal year	10,237	22,255
Prior	16,140	9,843
Revolving	27,274	17,192
Total	174,175	188,735
Consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	45,063	46,476
One year prior to current fiscal year	31,342	43,143
Two years prior to current fiscal year	26,194	30,433
Three years prior to current fiscal year	17,300	18,937
Four years prior to current fiscal year	9,979	21,880
Prior	16,019	9,488
Revolving	25,418	15,089
Total	171,315	185,446
Consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	58
One year prior to current fiscal year	24	27
Two years prior to current fiscal year	431	14
Three years prior to current fiscal year	37	41
Four years prior to current fiscal year	167	42
Prior	3	21
Revolving	1,199	1,854
Total	1,861	2,057
Consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	18	0
Three years prior to current fiscal year	0	42
Four years prior to current fiscal year	17	4
Prior	0	151
Revolving	223	228
Total	258	425
Consumer | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	7
One year prior to current fiscal year	0	50
Two years prior to current fiscal year	92	193
Three years prior to current fiscal year	23	24
Four years prior to current fiscal year	74	329
Prior	118	183
Revolving	434	21
Total	741	807
Consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	0	0
Paycheck Protection Program
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	87,036	566,961
One year prior to current fiscal year	4,071	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	91,107	566,961
Paycheck Protection Program | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	87,036	566,961
One year prior to current fiscal year	4,071	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	$ 91,107	$ 566,961

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)contract	Dec. 31, 2020USD ($)contract	Dec. 31, 2019USD ($)contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	12	10	9
Pre-Modification Outstanding Recorded Investment	$ 802	$ 699	$ 4,704
Post-Modification Outstanding Recorded Investment	$ 802	$ 699	$ 4,704
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
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Commercial real estate - owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 2,166
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 2,166
Commercial real estate - non-owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0		0
Pre-Modification Outstanding Recorded Investment	$ 0		$ 0
Post-Modification Outstanding Recorded Investment	$ 0		$ 0
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	5	2	3
Pre-Modification Outstanding Recorded Investment	$ 261	$ 150	$ 1,193
Post-Modification Outstanding Recorded Investment	$ 261	$ 150	$ 1,193
Commercial and financial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	3	4	3
Pre-Modification Outstanding Recorded Investment	$ 457	$ 437	$ 1,326
Post-Modification Outstanding Recorded Investment	$ 457	$ 437	$ 1,326
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	4	4	1
Pre-Modification Outstanding Recorded Investment	$ 84	$ 112	$ 19
Post-Modification Outstanding Recorded Investment	$ 84	$ 112	$ 19

Allowance for Credit Losses - A

Allowance for Credit Losses - Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 92,733	$ 35,154	$ 32,423
Initial Allowance on PCD Loans Acquired During the Period	3,046	6,279
Provision for Credit Losses	(9,421)	37,779	10,999
Charge- Offs	(6,098)	(9,842)	(10,559)
Recoveries	3,071	2,251	2,420
TDR Allowance Adjustments	(16)	(114)	(129)
Ending Balance	83,315	92,733	35,154
Provision for credit losses on accrued interest receivable		400
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	4,920	1,842	2,233
Initial Allowance on PCD Loans Acquired During the Period	0	87
Provision for Credit Losses	(2,300)	1,399	(421)
Charge- Offs	0	0	0
Recoveries	133	114	31
TDR Allowance Adjustments	(2)	(1)	(1)
Ending Balance	2,751	4,920	1,842
Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	9,868	5,361
Initial Allowance on PCD Loans Acquired During the Period	0	1,161
Provision for Credit Losses	(1,289)	3,632
Charge- Offs	0	(310)
Recoveries	0	18
TDR Allowance Adjustments	0	(74)
Ending Balance	8,579	9,868	5,361
Commercial real estate - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	38,266	7,863
Initial Allowance on PCD Loans Acquired During the Period	1,327	2,236
Provision for Credit Losses	(1,664)	18,966
Charge- Offs	(1,327)	(177)
Recoveries	15	37
TDR Allowance Adjustments	0	0
Ending Balance	36,617	38,266	7,863
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		13,224	11,112
Provision for Credit Losses			1,677
Charge- Offs			(248)
Recoveries			744
TDR Allowance Adjustments			(61)
Ending Balance			13,224
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	17,500	7,667	7,775
Initial Allowance on PCD Loans Acquired During the Period	0	124
Provision for Credit Losses	(5,822)	3,840	(231)
Charge- Offs	(57)	(240)	(152)
Recoveries	1,196	350	338
TDR Allowance Adjustments	(6)	(28)	(63)
Ending Balance	12,811	17,500	7,667
Commercial and financial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	18,690	9,716	8,585
Initial Allowance on PCD Loans Acquired During the Period	1,719	2,643
Provision for Credit Losses	2,292	8,329	7,969
Charge- Offs	(3,987)	(7,091)	(7,550)
Recoveries	1,030	1,416	712
TDR Allowance Adjustments	0	0	0
Ending Balance	19,744	18,690	9,716
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	3,489	2,705	2,718
Initial Allowance on PCD Loans Acquired During the Period	0	28
Provision for Credit Losses	(638)	1,613	2,005
Charge- Offs	(727)	(2,024)	(2,609)
Recoveries	697	316	595
TDR Allowance Adjustments	(8)	(11)	(4)
Ending Balance	2,813	3,489	2,705
Paycheck Protection Program
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	0	0
Initial Allowance on PCD Loans Acquired During the Period	0	0
Provision for Credit Losses	0	0
Charge- Offs	0	0
Recoveries	0	0
TDR Allowance Adjustments	0	0
Ending Balance	$ 0	0	0
Impact of Adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		21,226
Ending Balance			21,226
Impact of Adoption of ASC 326 | Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		1,479
Ending Balance			1,479
Impact of Adoption of ASC 326 | Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		80
Ending Balance			80
Impact of Adoption of ASC 326 | Commercial real estate - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		9,341
Ending Balance			9,341
Impact of Adoption of ASC 326 | Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		5,787
Ending Balance			5,787
Impact of Adoption of ASC 326 | Commercial and financial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		3,677
Ending Balance			3,677
Impact of Adoption of ASC 326 | Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		862
Ending Balance			862
Impact of Adoption of ASC 326 | Paycheck Protection Program
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		$ 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, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Recorded Investment
Individually Evaluated	$ 39,863	$ 49,196
Collectively Evaluated	5,885,166	5,686,153
Total	5,925,029	5,735,349
Associated Allowance
Individually Evaluated	4,754	7,708
Collectively Evaluated	78,561	85,025
Total	83,315	92,733	$ 35,154	$ 32,423
Construction and land development
Recorded Investment
Individually Evaluated	271	276
Collectively Evaluated	230,553	244,832
Total	230,824	245,108
Associated Allowance
Individually Evaluated	92	13
Collectively Evaluated	2,659	4,907
Total	2,751	4,920	1,842	2,233
Commercial real estate - owner occupied
Recorded Investment
Individually Evaluated	5,131	10,243
Collectively Evaluated	1,192,643	1,131,067
Total	1,197,774	1,141,310
Associated Allowance
Individually Evaluated	419	402
Collectively Evaluated	8,160	9,466
Total	8,579	9,868	5,361
Commercial real estate - non-owner occupied
Recorded Investment
Individually Evaluated	5,905	8,083
Collectively Evaluated	1,730,534	1,387,771
Total	1,736,439	1,395,854
Associated Allowance
Individually Evaluated	27	1,640
Collectively Evaluated	36,590	36,626
Total	36,617	38,266	7,863
Residential real estate
Recorded Investment
Individually Evaluated	16,345	16,506
Collectively Evaluated	1,409,009	1,326,122
Total	1,425,354	1,342,628
Associated Allowance
Individually Evaluated	646	2,064
Collectively Evaluated	12,165	15,436
Total	12,811	17,500	7,667	7,775
Commercial and financial
Recorded Investment
Individually Evaluated	11,470	13,281
Collectively Evaluated	1,057,886	841,472
Total	1,069,356	854,753
Associated Allowance
Individually Evaluated	2,885	3,498
Collectively Evaluated	16,859	15,192
Total	19,744	18,690	9,716	8,585
Consumer
Recorded Investment
Individually Evaluated	741	807
Collectively Evaluated	173,434	187,928
Total	174,175	188,735
Associated Allowance
Individually Evaluated	685	91
Collectively Evaluated	2,128	3,398
Total	2,813	3,489	2,705	$ 2,718
Paycheck Protection Program
Recorded Investment
Individually Evaluated	0	0
Collectively Evaluated	91,107	566,961
Total	91,107	566,961
Associated Allowance
Individually Evaluated	0	0
Collectively Evaluated	0	0
Total	$ 0	$ 0	$ 0

Derivatives - Additional Inform

Derivatives - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)contract	Dec. 31, 2020USD ($)
Derivative [Line Items]
Amount expected to be reclassified from accumulated other comprehensive income into interest income	$ 400
Back-to-Back Swaps
Derivative [Line Items]
Notional amount	$ 175,392	$ 182,379
Weighted average maturity (in years)	6 years 8 months 12 days	7 years 6 months
Back-to-Back Swaps | Other Assets and Other Liabilities
Derivative [Line Items]
Fair value of derivatives assets and liabilities	$ 8,022	$ 13,339
Interest Rate Floor
Derivative [Line Items]
Notional amount	$ 300,000	300,000
Number of derivative contracts | contract	2
Interest Rate Floor | Loan Interest Income
Derivative [Line Items]
Loss recognized in OCI	$ 700	200
Reclassification from AOCI into income	200	18
Interest Rate Floor | Other Assets
Derivative [Line Items]
Fair value of derivatives assets and liabilities	290	1,004
Fair value of derivative assets	300	$ 1,000
Interest Rate Floor, November 2023 Maturity
Derivative [Line Items]
Notional amount	150,000
Interest Rate Floor, October 2023 Maturity
Derivative [Line Items]
Notional amount	$ 150,000

Derivatives - Schedule of Deriv

Derivatives - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Back-to-back swaps
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	$ 175,392	$ 182,379
Back-to-back swaps | Other Assets and Other Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value	8,022	13,339
Interest rate floors
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	300,000	300,000
Interest rate floors | Other Assets
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value	$ 290	$ 1,004

Bank Premises and Equipment - S

Bank Premises and Equipment - Summary of Bank Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Cost	$ 129,854	$ 134,227
Accumulated Depreciation & Amortization	(57,450)	(59,110)
Net Carrying Value	72,404	75,117
Land	23,359	22,586
Premises
Property, Plant and Equipment [Line Items]
Cost	95,810	95,852
Accumulated Depreciation & Amortization	(30,913)	(28,999)
Net Carrying Value	64,897	66,853
Furniture and Equipment
Property, Plant and Equipment [Line Items]
Cost	34,044	38,375
Accumulated Depreciation & Amortization	(26,537)	(30,111)
Net Carrying Value	$ 7,507	$ 8,264

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Beginning of year	$ 221,176	$ 205,286	$ 204,753
Changes from business combinations	30,978	15,890	533
Total	$ 252,154	$ 221,176	$ 205,286

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-lived Intangible Assets [Roll Forward]
Beginning of year	$ 14,577	$ 18,305	$ 24,807
Acquired CDI, including measurement period adjustments	3,454	2,129	(676)
Amortization expense	(5,033)	(5,857)	(5,826)
End of year	$ 12,998	$ 14,577	$ 18,305
Remaining average amortization period for CDI	39 months	44 months	47 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, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 41,596	$ 38,144
Accumulated Amortization	$ (28,598)	$ (23,567)

Goodwill and Acquired Intangi_6

Goodwill and Acquired Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Estimated amortization expense, next year	$ 4.8
Estimated amortization expense in two years	4.1
Estimated amortization expense in three years	1.5
Estimated amortization expense in four years	1.1
Estimated amortization expense in five years	0.9
Mortgage service rights retained from sale of SBA	$ 1.8	$ 2.2

Borrowings - Federal Funds Purc

Borrowings - Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Maximum amount outstanding at any month end	$ 124,101	$ 119,609	$ 193,388
Weighted average interest rate at end of year	0.12%	0.16%	1.17%
Average amount outstanding	$ 113,881	$ 84,514	$ 106,142
Weighted average interest rate during the year	0.12%	0.33%	1.35%

Borrowings - Schedule of Collat

Borrowings - Schedule of Collateral Type and Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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:	$ 134,577	$ 137,268	$ 94,354

Borrowings - Additional Informa

Borrowings - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)
Debt Instrument [Line Items]
Secured lines of credit	$ 1,600
Secured Lines of Credit
Debt Instrument [Line Items]
Advances from Federal Home Loan Banks	0
Trust I & II
Debt Instrument [Line Items]
Junior subordinated deferrable interest notes issued	41.2
SBCF Statutory Trust III
Debt Instrument [Line Items]
Junior subordinated deferrable interest notes issued	$ 12.4

Borrowings - Schedule of Junior

Borrowings - Schedule of Junior Subordinated Debentures and Related Trust Preferred and Common Equity Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)
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	1.97%
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	1.53%
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	1.55%
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	3.47%
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	3.01%
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	1.55%
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	2.11%
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 ($) $ / shares in Units, $ in Thousands	Aug. 06, 2021	Aug. 31, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	May 26, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined contribution plan charges to operations				$ 3,100	$ 2,800	$ 2,400
Share-based compensation expense				$ 8,685	$ 7,304	$ 7,244
Number of shares authorized for repurchase (in shares)			100,000,000	100,000,000
Percent of fair market value that employees may purchase shares				95.00%
Legacy Bank of Florida
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of options converted	$ 4,736
2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)							1,750,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for repurchase (in shares)			800,000	800,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Maximum term				10 years
Shares granted (in shares)				356,497		3,438
Weighted-average exercise price, granted (in dollars per share)				$ 16.70
Stock options | 2021 Plan | Legacy Bank of Florida
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)		356,497
Shares granted (in shares)		356,497
Weighted-average exercise price, granted (in dollars per share)		$ 16.70
Fair value of options converted		$ 4,700
Share-based compensation expense			$ 900
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Shares granted (in shares)				218,695	379,869	157,861
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Shares granted (in shares)				103,073	171,287	75,002
Restricted Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target award percentage				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%

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Share-based compensation expense	$ 8,685	$ 7,304	$ 7,244
Income tax benefit	$ (2,067)	$ (1,737)	$ (1,723)

Employee Benefits and Stock C_5

Employee Benefits and Stock Compensation - Summary of Unrecognized Compensation Cost (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 10,927
Weighted-Average Period Remaining (Years)	1 year 9 months 25 days
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 7,645
Weighted-Average Period Remaining (Years)	1 year 8 months 15 days
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 3,282
Weighted-Average Period Remaining (Years)	2 years 25 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 0

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, 2021$ / sharesshares
Restricted Stock Awards
Restricted Award Shares
Non-vested beginning balance (in shares) | shares	425,154
Granted (in shares) | shares	218,695
Forfeited/Cancelled (in shares) | shares	(39,729)
Vested (in shares) | shares	(205,416)
Non-vested ending balance (in shares) | shares	398,704
Weighted-Average Grant-Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 20.03
Granted (in dollars per share) | $ / shares	35.08
Forfeited/Canceled (in dollars per share) | $ / shares	21.72
Vested (in dollars per share) | $ / shares	23.03
Non-vested at ending of period (in dollars per share) | $ / shares	$ 26.68
Restricted Stock Units
Restricted Award Shares
Non-vested beginning balance (in shares) | shares	309,597
Granted (in shares) | shares	103,073
Forfeited/Cancelled (in shares) | shares	(52,827)
Vested (in shares) | shares	(74,622)
Non-vested ending balance (in shares) | shares	285,221
Weighted-Average Grant-Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 23.54
Granted (in dollars per share) | $ / shares	35.24
Forfeited/Canceled (in dollars per share) | $ / shares	25.83
Vested (in dollars per share) | $ / shares	25.95
Non-vested at ending of period (in dollars per share) | $ / shares	$ 26.71

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	218,695	379,869	157,861
Weighted-average grant date fair value (in dollars per share)	$ 35.08	$ 18.36	$ 26.86
Fair value of awards vested	$ 4,731	$ 3,745	$ 4,128
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	103,073	171,287	75,002
Weighted-average grant date fair value (in dollars per share)	$ 35.24	$ 17.29	$ 30.02
Fair value of awards vested	$ 1,936	$ 2,962	$ 2,864

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 options	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rates	0.12%	2.53%
Expected dividend yield	1.65%	0.00%
Expected volatility	36.87%	34.50%
Expected lives (years)	1 year	5 years

Employee Benefits and Stock C_9

Employee Benefits and Stock Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2019
Options
Options, outstanding at beginning of period (in shares)	839,884
Options granted (in shares)	356,497	3,438
Options, exercised (in shares)	(384,035)
Options, forfeited (in shares)	(2,166)
Options, outstanding at end of period (in shares)	810,180
Options, exercisable at end of period (in shares)	810,180
Weighted-Average Exercise Price
Weighted-average exercise price at beginning of period (in dollars per share)	$ 22.94
Weighted-average exercise price, granted (in dollars per share)	16.70
Weighted-average exercise price, exercised (in dollars per share)	19.10
Weighted-average exercise price, forfeited (in dollars per share)	18.65
Weighted-average exercise price at end of period (in dollars per share)	22.02
Weighted-average exercise price, exercisable at end of period (in dollars per share)	$ 22.02
Weighted- Average Remaining Contractual Term and Aggregate Intrinsic Value
Weighted-average remaining contractual term, outstanding	4 years 5 months 12 days
Weighted-average remaining contractual term, exercisable	4 years 5 months 12 days
Aggregate intrinsic value, outstanding	$ 10,829
Aggregate intrinsic value, exercisable	$ 10,829

Employee Benefits and Stock _10

Employee Benefits and Stock Compensation - Summary of Stock Options (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	356,497		3,438
Weighted-average grant date fair value (in dollars per share)	$ 16.70		$ 28.42
Intrinsic value of stock options exercised, in thousands	$ 5,808	$ 830	$ 277

Employee Benefits and Stock _11

Employee Benefits and Stock Compensation - Summary of Information Related to Stock Options (Details)	12 Months Ended
	Dec. 31, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	810,180
Remaining Contractual Life (Years)	4 years 6 months
Options exercisable (in shares) | shares	810,180
Weighted average exercise price (in dollars per share)	$ 22.02
$5.88 to $14.82
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, lower limit (in dollars per share)	5.88
Range of exercise prices, upper limit (in dollars per share)	$ 14.82
Options outstanding (in shares) | shares	300,299
Remaining Contractual Life (Years)	2 years 2 months 12 days
Options exercisable (in shares) | shares	300,299
Weighted average exercise price (in dollars per share)	$ 12.12
$15.80 to $28.69
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, lower limit (in dollars per share)	15.80
Range of exercise prices, upper limit (in dollars per share)	$ 28.69
Options outstanding (in shares) | shares	331,814
Remaining Contractual Life (Years)	5 years 6 months
Options exercisable (in shares) | shares	331,814
Weighted average exercise price (in dollars per share)	$ 26.09
$31.15 to $31.15
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, lower limit (in dollars per share)	31.15
Range of exercise prices, upper limit (in dollars per share)	$ 31.15
Options outstanding (in shares) | shares	178,067
Remaining Contractual Life (Years)	6 years 3 months 18 days
Options exercisable (in shares) | shares	178,067
Weighted average exercise price (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, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	14,834	19,713	16,320
Weighted-average employee purchase price (in dollars per share)	$ 32.43	$ 20.68	$ 25.39

Lease Commitments - Lease Cost

Lease Commitments - Lease Cost Information Related to Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 5,872	$ 5,738	$ 5,570
Variable lease cost	996	1,325	1,211
Short-term lease cost	564	497	715
Sublease income	(601)	(684)	(618)
Total lease cost	$ 6,831	$ 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, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 35,256	$ 25,538
Other assets	Other assets	Other assets	Other assets
Operating lease liabilities	$ 38,330	$ 28,959
Other liabilities	Other liabilities	Other liabilities	Other liabilities
Cash paid during the year for amounts included in the measurement of operating lease liabilities	$ 11,117	$ 6,035
Right-of-use assets recorded during the year in exchange for new or renewed operating lease obligations	12,459	2,095
Right-of-use assets obtained during the year through bank acquisition	$ 2,606	$ 2,343
Weighted average remaining lease term for operating leases	8 years 3 months 18 days	8 years 6 months
Weighted average discount rate for operating leases	4.25%	4.62%

Lease Commitments - Maturities

Lease Commitments - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2022	$ 6,597
2023	6,166
2024	6,032
2025	5,561
2026	4,869
Thereafter	15,505
Total undiscounted cash flows	44,730
Less: Net present value adjustment	(6,400)
Total	$ 38,330	$ 28,959

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax Expense Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current
Federal	$ 23,661	$ 21,688	$ 20,954
State	3,882	4,471	1,932
Deferred
Federal	6,800	(2,697)	2,808
State	(8)	(644)	4,179
Total income tax provision	$ 34,335	$ 22,818	$ 29,873

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Expected Tax Benefit with Pretax Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax rate applied to income before income taxes	$ 33,335	$ 21,122	$ 27,008
Increase (decrease) resulting from the effects of:
Tax law change	0	(375)	0
Nondeductible acquisition costs	419	199	125
Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance	(1,276)	(1,110)	(1,282)
State income taxes	(813)	(804)	(1,283)
Tax credit investments	(213)	(72)	(72)
Stock compensation	(1,239)	(111)	(698)
Executive compensation disallowance	253	0	0
Other	(5)	142	(36)
Federal tax provision	30,461	18,991	23,762
State tax provision	3,874	3,827	6,111
Total income tax provision	$ 34,335	$ 22,818	$ 29,873

Income Taxes - Summary of Net D

Income Taxes - Summary of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Assets, Gross [Abstract]
Allowance for credit losses	$ 22,686	$ 24,158
Other real estate owned	52	422
Accrued stock compensation	2,323	1,973
Federal tax loss carryforward	2,138	2,857
State tax loss carryforward	1,226	1,333
Lease liabilities	9,399	7,101
Net unrealized securities losses	2,287	0
Deferred compensation	3,276	2,565
Accrued interest and fee income	0	995
Other	477	38
Gross deferred tax assets	43,864	41,442
Less: Valuation allowance	0	0
Deferred tax assets net of valuation allowance	43,864	41,442
Deferred Tax Liabilities, Gross [Abstract]
Core deposit base intangible	(3,134)	(3,234)
Accrued interest and fee income	(1,660)	0
Net unrealized securities gains	0	(5,890)
Premises and equipment	(776)	(534)
Right of use assets	(8,645)	(6,262)
Other	(2,328)	(1,893)
Gross deferred tax liabilities	(16,543)	(17,813)
Net deferred tax assets	$ 27,321	$ 23,629

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Unrealized losses resulting in deferred tax asset		$ (9,300,000)
Deferred tax assets from unrealized losses on certain investments in debt securities		2,287,000	$ 0
Unrealized gains resulting in a deferred tax liability			26,300,000
Deferred tax liability from unrealized gains on certain investments in debt securities		0	5,890,000
Net deferred tax assets		27,321,000	23,629,000
Deferred tax assets		27,321,000	23,629,000
Accrual for income tax interest or penalties		0
Income tax benefit related to share-based compensation		900,000	100,000	$ 800,000
Amortization reflected as income expense related to affordable housing project investments		1,600,000	900,000	900,000
Affordable housing project tax credits		1,200,000	800,000	800,000
Affordable housing project tax benefits		700,000	200,000	200,000
Carrying value of affordable housing tax credits		30,100,000	16,400,000
Affordable housing tax credits, unfunded amounts		23,200,000	9,900,000
Unrecognized income tax benefits		0
Tax expense (benefit) from change in enacted tax rate		33,335,000	21,122,000	27,008,000
Income tax credit and deferred tax asset related to adoption of CECL			5,500,000
Income tax benefit from CARES act		0	375,000	$ 0
U.S. Federal
Operating Loss Carryforwards [Line Items]
Net deferred tax assets		20,800,000	18,000,000
Deferred tax assets		2,100,000
State
Operating Loss Carryforwards [Line Items]
Net deferred tax assets		6,500,000	$ 5,600,000
Deferred tax assets		1,200,000
Tax expense (benefit) from change in enacted tax rate	$ 1,100,000	$ (800,000)

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Required Regulatory Capital (Details) $ in Thousands	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Parent Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital Ratio (to risk-weighted assets), Amount	$ 1,200,885	$ 1,029,455
Tier 1 Capital (to risk-weighted assets), Amount	1,147,306	970,594
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	1,075,656	899,225
Leverage (to adjusted average assets), Amount	$ 1,147,306	$ 970,594
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	0.1821	0.1851
Tier 1 Capital (to risk-weighted assets), Ratio	0.1740	0.1746
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	16.31%	16.17%
Leverage (to adjusted average assets), Ratio	0.1168	0.1192
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 527,630	$ 444,839
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	395,723	333,629
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	296,792	250,222
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 392,763	$ 325,690
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	$ 1,099,439	$ 956,592
Tier 1 Capital (to risk-weighted assets), Amount	1,045,860	897,731
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	1,045,856	897,727
Leverage (to adjusted average assets), Amount	$ 1,045,860	$ 897,731
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	0.1668	0.1721
Tier 1 Capital (to risk-weighted assets), Ratio	0.1586	0.1615
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	15.86%	16.15%
Leverage (to adjusted average assets), Ratio	0.1065	0.1103
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 527,055	$ 444,617
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	395,291	333,463
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	296,468	250,097
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 392,638	$ 325,523
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	$ 658,819	$ 555,772
Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	527,055	444,617
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	428,232	361,252
Leverage (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 490,798	$ 406,904
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)	Dec. 31, 2021shares
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer rate	2.50%
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)	800,000
Profit Sharing Plan
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Reserved common shares for issuance (in shares)	1,750,000

Seacoast Banking Corporation _3

Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Summary of Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Other assets	$ 201,857	$ 162,214
Total Assets	9,681,433	8,342,392
Liabilities and Shareholders' Equity
Subordinated debt	71,646	71,365
Other liabilities	109,897	88,455
Shareholders' equity	1,310,736	1,130,402	$ 985,639	$ 864,267
Total Liabilities & Shareholders' Equity	9,681,433	8,342,392
Parent Company
Assets
Cash	57	70
Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days	98,398	70,074
Investment in subsidiaries	1,286,478	1,134,536
Other assets	1,140	659
Total Assets	1,386,073	1,205,339
Liabilities and Shareholders' Equity
Subordinated debt	71,646	71,365
Other liabilities	3,795	3,676
Shareholders' equity	1,310,632	1,130,298
Total Liabilities & Shareholders' Equity	$ 1,386,073	$ 1,205,339

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Income
Total Interest Income	$ 284,244	$ 287,035	$ 289,823
Interest expense	8,219	24,292	46,205
Other expenses	16,341	15,835	15,177
Income tax benefit	34,335	22,818	29,873
Net Income	124,403	77,764	98,739
Parent Company
Income
Interest/other	167	270	679
Dividends from subsidiary Bank	47,684	20,230	18,084
Total Interest Income	47,851	20,500	18,763
Interest expense	1,683	2,236	3,368
Other expenses	765	838	651
Total expenses	2,448	3,074	4,019
Income before income taxes and equity in undistributed income of subsidiaries	45,403	17,426	14,744
Income tax benefit	(481)	(589)	(702)
Income before equity in undistributed income of subsidiaries	45,884	18,015	15,446
Equity in undistributed income of subsidiaries	78,519	59,749	83,293
Net Income	$ 124,403	$ 77,764	$ 98,739

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	$ 124,403	$ 77,764	$ 98,739
Net (increase) decrease in other assets	(42,437)	(35,555)	(5,614)
Net increase (decrease) in other liabilities	28,883	18,776	(4,206)
Net Cash Provided by Operating Activities	154,572	60,652	117,745
Cash Flows From Investing Activities
Net Cash Used in Investing Activities	(412,511)	(342,502)	(321,341)
Cash Flows From Financing Activities
Dividends paid	(22,506)	0	0
Stock based employee benefit plans	5,022
Stock based employee benefit plans		(1,486)	(2,135)
Net Cash Provided by Financing Activities	591,580	561,407	212,176
Net increase in cash and cash equivalents	333,641	279,557	8,580
Cash and Cash Equivalents at Beginning of Year	404,088	124,531	115,951
Cash and Cash Equivalents at End of Year	737,729	404,088	124,531
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	9,977	23,548	46,130
Parent Company
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	124,403	77,764	98,739
Equity in undistributed income of subsidiaries	(78,519)	(59,749)	(83,293)
Net (increase) decrease in other assets	(489)	1,772	(738)
Net increase (decrease) in other liabilities	400	256	265
Net Cash Provided by Operating Activities	45,795	20,043	14,973
Cash Flows From Investing Activities
Net cash paid for bank acquisition	0	(1,462)	0
Net (advances)/repayments with subsidiary	(28,324)	(17,095)	(12,861)
Net Cash Used in Investing Activities	(28,324)	(18,557)	(12,861)
Cash Flows From Financing Activities
Dividends paid	(22,506)	0	0
Stock based employee benefit plans	5,022
Stock based employee benefit plans		(1,486)	(2,239)
Net Cash Provided by Financing Activities	(17,484)	(1,486)	(2,239)
Net increase in cash and cash equivalents	(13)	0	(127)
Cash and Cash Equivalents at Beginning of Year	70	70	197
Cash and Cash Equivalents at End of Year	57	70	70
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	$ 1,441	$ 1,992	$ 3,186

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, 2021	Dec. 31, 2020
Other Commitments [Line Items]
Commitments to extend credit	$ 1,980,338	$ 1,548,482
Unfunded limited partner equity commitment	36,393	21,390
Secured
Other Commitments [Line Items]
Collateral held	13,300	12,400
Secured
Other Commitments [Line Items]
Standby letters of credit and financial guarantees written	12,091	11,167
Unsecured
Other Commitments [Line Items]
Standby letters of credit and financial guarantees written	$ 1,189	$ 1,197

Fair Value - Fair Value Measure

Fair Value - Fair Value Measurements for Items Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial Assets
Available-for-sale debt securities	$ 1,644,319	$ 1,398,157
Loans held for sale	31,791	68,890
Other real estate owned	13,618	12,750
Fair Value, Measurements, Recurring
Financial Assets
Available-for-sale debt securities	1,644,319	1,398,157
Derivative financial instruments	8,312	14,343
Loans held for sale	31,791	68,890
Equity securities	9,316	6,530
Financial Liabilities
Derivative financial instruments	8,022	13,339
Fair Value, Measurements, Recurring | Level 1
Financial Assets
Available-for-sale debt securities	197	101
Derivative financial instruments	0	0
Loans held for sale	0	0
Equity securities	9,316	6,530
Financial Liabilities
Derivative financial instruments	0	0
Fair Value, Measurements, Recurring | Level 2
Financial Assets
Available-for-sale debt securities	1,644,122	1,398,056
Derivative financial instruments	8,312	14,343
Loans held for sale	31,791	68,890
Equity securities	0	0
Financial Liabilities
Derivative financial instruments	8,022	13,339
Fair Value, Measurements, Recurring | Level 3
Financial Assets
Available-for-sale debt securities	0	0
Derivative financial instruments	0	0
Loans held for sale	0	0
Equity securities	0	0
Financial Liabilities
Derivative financial instruments	0	0
Fair Value, Measurements, Nonrecurring
Financial Assets
Loans	8,443	8,806
Other real estate owned	13,618	12,750
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	1,558	1,900
Other real estate owned	0	72
Fair Value, Measurements, Nonrecurring | Level 3
Financial Assets
Loans	6,885	6,906
Other real estate owned	$ 13,618	$ 12,678

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, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Aggregate fair value	$ 31,791	$ 68,890
Contractual balance	30,963	66,415
Excess	$ 828	$ 2,475

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Average capitalization rate	7.10%
Specific reserve	$ 83,315	$ 92,733	$ 35,154	$ 32,423
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired loans	13,100	16,500
Specific reserve	$ 4,700	$ 7,700

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, 2021	Dec. 31, 2020
Financial Assets
Held-to-maturity debt securities	$ 638,640	$ 184,484
Level 1
Financial Assets
Held-to-maturity debt securities	0	0
Time deposits with other banks		0
Loans, net	0	0
Financial Liabilities
Deposits	0	0
Subordinated debt	0	0
Level 2
Financial Assets
Held-to-maturity debt securities	627,398	192,179
Time deposits with other banks		762
Loans, net	0	0
Financial Liabilities
Deposits	0	0
Subordinated debt	69,348	58,227
Level 3
Financial Assets
Held-to-maturity debt securities	0	0
Time deposits with other banks		0
Loans, net	5,907,447	5,686,019
Financial Liabilities
Deposits	8,067,995	6,936,097
Subordinated debt	0	0
Carrying Amount
Financial Assets
Held-to-maturity debt securities	638,640	184,484
Time deposits with other banks		750
Loans, net	5,833,271	5,633,810
Financial Liabilities
Deposits	8,067,589	6,932,561
Subordinated debt	$ 71,646	$ 71,365

Business Combinations - Additio

Business Combinations - Additional Information (Details) $ / shares in Units, $ in Thousands	Jan. 03, 2022USD ($)branch	Aug. 06, 2021USD ($)branch	Aug. 21, 2020USD ($)branch	Mar. 13, 2020USD ($)branch	Aug. 31, 2021USD ($)$ / sharesshares	Dec. 31, 2021USD ($)	Dec. 31, 2021USD ($)$ / sharesshares	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Share-based compensation expense							$ 8,685	$ 7,304	$ 7,244
Acquisition costs							7,900	9,100	1,000
Specific reserve						$ 83,315	$ 83,315	$ 92,733	$ 35,154	$ 32,423
Stock options
Business Acquisition [Line Items]
Shares granted (in shares) | shares							356,497		3,438
Weighted-average exercise price, granted (in dollars per share) | $ / shares							$ 16.70
Legacy Bank of Florida
Business Acquisition [Line Items]
Number of branches acquired | branch		5
Percentage of common stock acquired		100.00%
Exchange ratio (in shares)		0.1703
Goodwill, nondeductible for tax purposes		$ 31,000
Fair value of options converted		4,736
Specific reserve		11,200
Legacy Bank of Florida | Stock options | Seacoast 2021 Incentive Plan
Business Acquisition [Line Items]
Shares granted (in shares) | shares					356,497
Weighted-average exercise price, granted (in dollars per share) | $ / shares					$ 16.70
Fair value of options converted					$ 4,700
Share-based compensation expense						$ 900
Legacy Bank of Florida | PCD Loans
Business Acquisition [Line Items]
Specific reserve		3,000
Legacy Bank of Florida | Acquired Non-PCD Loans
Business Acquisition [Line Items]
Specific reserve		$ 8,200
Fourth Street Banking Company
Business Acquisition [Line Items]
Number of branches acquired | branch			2
Percentage of common stock acquired			100.00%
Exchange ratio (in shares)			0.1275
Goodwill, nondeductible for tax purposes			$ 9,000
Specific reserve			10,400
Fourth Street Banking Company | PCD Loans
Business Acquisition [Line Items]
Specific reserve			5,800
Fourth Street Banking Company | Acquired Non-PCD Loans
Business Acquisition [Line Items]
Specific reserve			$ 4,600
First Bank of The Palm Beaches
Business Acquisition [Line Items]
Number of branches operated | branch				2
Percentage of common stock acquired				100.00%
Exchange ratio (in shares)				0.2000
Goodwill, nondeductible for tax purposes				$ 6,900
Specific reserve				2,300
First Bank of The Palm Beaches | PCD Loans
Business Acquisition [Line Items]
Specific reserve				500
First Bank of The Palm Beaches | Acquired Non-PCD Loans
Business Acquisition [Line Items]
Specific reserve				$ 1,800
Florida Business Bank | Subsequent Event
Business Acquisition [Line Items]
Number of branches operated | branch	1
Percentage of common stock acquired	100.00%
Exchange ratio (in shares)	0.7997
Fair value of options converted	$ 497
Sabal Palm Bancorp, Inc. | Subsequent Event
Business Acquisition [Line Items]
Number of branches operated | branch	3
Percentage of common stock acquired	100.00%
Exchange ratio (in shares)	0.2203
Fair value of options converted	$ 3,336

Business Combinations - Purchas

Business Combinations - Purchase Price (Details) $ / shares in Units, $ in Thousands	Jan. 03, 2022USD ($)$ / sharesshares	Aug. 06, 2021USD ($)$ / sharesshares	Aug. 21, 2020USD ($)$ / sharesshares	Mar. 13, 2020USD ($)$ / sharesshares
Legacy Bank of Florida
Business Acquisition [Line Items]
Number of shares outstanding (in shares) | shares		15,778,000
Exchange ratio (in shares)		0.1703
Number of shares of common stock issued (in shares) | shares		2,687,000
Multiplied by common stock price per share (in dollars per share) | $ / shares		$ 32.19
Value of common stock issued		$ 86,487
Cash paid for fractional shares		7
Fair value of options converted		4,736
Total purchase price		$ 91,230
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
Exchange ratio (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
Exchange ratio (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
Florida Business Bank | Subsequent Event
Business Acquisition [Line Items]
Number of shares outstanding (in shares) | shares	1,112,000
Exchange ratio (in shares)	0.7997
Number of shares of common stock issued (in shares) | shares	889,000
Multiplied by common stock price per share (in dollars per share) | $ / shares	$ 35.39
Value of common stock issued	$ 31,480
Fair value of options converted	497
Total purchase price	$ 31,977
Sabal Palm Bancorp, Inc. | Subsequent Event
Business Acquisition [Line Items]
Number of shares outstanding (in shares) | shares	7,536,000
Exchange ratio (in shares)	0.2203
Number of shares of common stock issued (in shares) | shares	1,660,000
Multiplied by common stock price per share (in dollars per share) | $ / shares	$ 35.39
Value of common stock issued	$ 58,762
Fair value of options converted	3,336
Total purchase price	$ 62,098

Business Combinations - Fair Va

Business Combinations - Fair Value of the Assets Purchased, Including Goodwill, and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Aug. 06, 2021	Dec. 31, 2020	Aug. 21, 2020	Mar. 13, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets:
Goodwill	$ 252,154		$ 221,176			$ 205,286	$ 204,753
Legacy Bank of Florida
Assets:
Cash		$ 98,107
Investment securities		992
Loans		477,215
Bank premises and equipment		2,577
Core deposit intangibles		3,454
Goodwill		30,978
Other assets		15,532
Total assets		628,855
Liabilities:
Deposits		494,921
Other liabilities		42,705
Total liabilities		$ 537,626
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
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
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

Business Combinations - Fair _2

Business Combinations - Fair Value of Acquired Loans (Details) - USD ($) $ in Thousands	Aug. 06, 2021	Aug. 21, 2020	Mar. 13, 2020
Legacy Bank of Florida
Business Acquisition [Line Items]
Book Balance	$ 486,282
Fair Value	477,215
Legacy Bank of Florida | Construction and land development
Business Acquisition [Line Items]
Book Balance	37,558
Fair Value	36,651
Legacy Bank of Florida | Commercial real estate - owner occupied
Business Acquisition [Line Items]
Book Balance	35,765
Fair Value	35,363
Legacy Bank of Florida | Commercial real estate - non-owner occupied
Business Acquisition [Line Items]
Book Balance	241,322
Fair Value	237,091
Legacy Bank of Florida | Residential real estate
Business Acquisition [Line Items]
Book Balance	71,118
Fair Value	70,541
Legacy Bank of Florida | Commercial and financial
Business Acquisition [Line Items]
Book Balance	61,274
Fair Value	58,324
Legacy Bank of Florida | Consumer
Business Acquisition [Line Items]
Book Balance	647
Fair Value	647
Legacy Bank of Florida | PPP loans
Business Acquisition [Line Items]
Book Balance	38,598
Fair Value	$ 38,598
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

Business Combinations - Carryin

Business Combinations - Carrying Amounts of Loans (Details) - USD ($) $ in Thousands	Aug. 06, 2021	Aug. 21, 2020	Mar. 13, 2020
Legacy Bank of Florida
Business Acquisition [Line Items]
Total purchased credit-impaired loan acquired	$ 477,215
Legacy Bank of Florida | PCD Loans
Business Acquisition [Line Items]
Book balance of loans at acquisition	66,371
Allowance for credit losses at acquisition	(3,046)
Non-credit related discount	(736)
Total purchased credit-impaired loan acquired	$ 62,589
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

Business Combinations - Pro-For

Business Combinations - Pro-Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition, Pro Forma Information [Abstract]
Net interest income	$ 288,971	$ 281,244
Net income available to common shareholders	$ 140,851	$ 71,124
EPS - basic (in dollars per share)	$ 2.41	$ 1.27
EPS - diluted (in dollars per share)	$ 2.39	$ 1.26