Seacoast Banking Corporation of Florida (SBCF) 10-Q/A 8 May 19 2019 Q1 Quarterly report (amended) Financial data

Document And Entity Information

Document And Entity Information	3 Months Ended
	Mar. 31, 2019shares
Document And Entity Information [Abstract]
Document Type	10-Q/A
Amendment Flag	true
Amendment Description
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Registrant Name	SEACOAST BANKING CORP OF FLORIDA
Entity Central Index Key	0000730708
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	SBCF
Entity Common Stock, Shares Outstanding	51,413,988

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Interest and fees on loans	$ 62,287	$ 45,257
Interest and dividends on securities	9,270	9,604
Interest on interest bearing deposits and other investments	918	616
Total Interest Income	72,475	55,477
Interest on deposits	3,873	1,538
Interest on time certificates	4,959	2,179
Interest on borrowed money	2,869	1,998
Total Interest Expense	11,701	5,715
Net Interest Income	60,774	49,762
Provision for loan losses	1,397	1,085
Net Interest Income after Provision for Loan Losses	59,377	48,677
Noninterest income
Other income	12,845	12,398
Securities losses, net	(9)	(102)
Total Noninterest Income (Note I)	12,836	12,296
Total Noninterest Expenses (Note I)	43,099	37,164
Income Before Income Taxes	29,114	23,809
Provision for income taxes	6,409	5,782
Net Income	$ 22,705	$ 18,027
Share Data
Net income per share of common stock - diluted (in dollars per share)	$ 0.44	$ 0.38
Net income per share of common stock - basic (in dollars per share)	$ 0.44	$ 0.38
Average common shares outstanding - diluted (in shares)	52,039	47,688
Average shares outstanding - basic (in shares)	51,359	46,952

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 22,705	$ 18,027
Other comprehensive income (loss):
Unrealized gains (losses) on securities available for sale	12,676	(11,022)
Reclassification of unrealized losses on securities transferred to available for sale upon adoption of new accounting pronouncement	(730)	0
Amortization of unrealized losses on securities transferred to held to maturity, net	71	115
Reclassification adjustment for losses included in net income	87	0
(Provision) benefit for income taxes	(3,261)	2,898
Total other comprehensive income (loss)	8,843	(8,009)
Comprehensive Income	$ 31,548	$ 10,018

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 98,270	$ 92,242
Interest bearing deposits with other banks	105,741	23,709
Total cash and cash equivalents	204,011	115,951
Time deposits with other banks	8,174	8,243
Debt securities:
Securities available for sale (at fair value)	877,549	865,831
Securities held to maturity (fair value $291,340 at March 31, 2019 and $349,895 at December 31, 2018)	295,485	357,949
Total debt securities	1,173,034	1,223,780
Loans held for sale (at fair value)	13,900	11,873
Loans	4,828,441	4,825,214
Less: Allowance for loan losses	(32,822)	(32,423)
Loans, net of allowance for loan losses	4,795,619	4,792,791
Bank premises and equipment, net	70,412	71,024
Other real estate owned	11,921	12,802
Goodwill	205,260	204,753
Other intangible assets, net	23,959	25,977
Bank owned life insurance	124,306	123,394
Net deferred tax assets	24,647	28,954
Other assets	128,146	128,117
Total Assets	6,783,389	6,747,659
Liabilities
Deposits	5,605,578	5,177,240
Securities sold under agreements to repurchase, maturing within 30 days	148,005	214,323
Federal Home Loan Bank (FHLB) borrowings	3,000	380,000
Subordinated debt	70,874	70,804
Other liabilities	59,508	41,025
Total Liabilities	5,886,965	5,883,392
Shareholders' Equity
Common stock, par value $0.10 per share, authorized 120,000,000 shares, issued 51,621,160 and outstanding 51,413,988 shares at March 31, 2019, and authorized 120,000,000, issued 51,514,734 and outstanding 51,361,079 shares at December 31, 2018	5,141	5,136
Other shareholders' equity	891,283	859,131
Total Shareholders' Equity	896,424	864,267
Total Liabilities and Shareholders' Equity	$ 6,783,389	$ 6,747,659

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Held to maturity, fair value	$ 291,340	$ 349,895
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares issued (in shares)	51,621,160	51,514,734
Common stock, shares outstanding (in shares)	51,413,988	51,361,079

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities
Net income	$ 22,705	$ 18,027
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,669	1,568
Amortization of premiums and discounts on securities, net	625	742
Amortization of operating lease right-of-use assets	1,025
Other amortization and accretion, net	(810)	(406)
Stock based compensation	2,129	1,454
Origination of loans designated for sale	(54,034)	(78,156)
Sale of loans designated for sale	54,813	83,459
Provision for loan losses	1,397	1,085
Deferred income taxes	1,216	4,707
Losses on sale of securities	87	0
Gains on sale of loans	(1,819)	(1,884)
Gains on sale and write-downs of other real estate owned	(187)	1
Losses on disposition of fixed assets	(208)	(4)
Changes in operating assets and liabilities, net of effects from acquired companies:
Net decrease in other assets	2,069	2,234
Net decrease in other liabilities	(10,594)	(273)
Net cash provided by operating activities	20,083	32,554
Cash Flows from Investing Activities
Maturities and repayments of debt securities available for sale	18,261	27,296
Maturities and repayments of debt securities held to maturity	8,830	16,085
Proceeds from sale of debt securities available for sale	35,048	0
Purchases of debt securities available for sale	0	(72,311)
Maturities of time deposits with other banks	69	0
Net new loans and principal repayments	(3,141)	(84,063)
Proceeds from sale of other real estate owned	1,572	3,300
Proceeds from sale of FHLB and Federal Reserve Bank Stock	22,057	10,540
Purchase of FHLB and Federal Reserve Bank Stock	(9,749)	(13,027)
Proceeds from sale of Visa Class B stock	0	21,333
Redemption of bank owned life insurance	12,378	4,232
Additions to bank premises and equipment	(849)	(1,288)
Net cash provided by (used in) investing activities	84,476	(87,903)
Cash Flows from Financing Activities
Net increase in deposits	428,338	126,823
Net decrease in federal funds purchased and repurchase agreements	(66,318)	(42,845)
Net decrease in FHLB borrowings	(377,000)	(3,000)
Stock based employee benefit plans	(1,519)	726
Dividends paid	0	0
Net cash (used in) provided by financing activities	(16,499)	81,704
Net increase in cash and cash equivalents	88,060	26,355
Cash and cash equivalents at beginning of period	115,951	109,504
Cash and cash equivalents at end of period	204,011	135,859
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	11,422	5,533
Cash paid during the period for taxes	0	1,200
Initial recognition of operating lease right-of-use assets	29,077	0
Initial recognition of operating lease liabilities	33,403	0
Supplemental disclosure of non cash investing activities:
Transfer of debt securities from held to maturity to available for sale	52,796	0
Transfers from loans to other real estate owned	430	3,919
Transfers from bank premises to other real estate owned	$ 0	$ 2,030

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss), Net
Beginning balance (in shares) at Dec. 31, 2017		46,918
Beginning balance at Dec. 31, 2017	$ 689,663	$ 4,693	$ 661,632	$ 29,913	$ (2,359)	$ (4,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	10,018			18,027		(8,009)
Stock based compensation expense	1,455		1,455
Common stock issued for stock based employee benefit plans (in shares)		3
Common stock issued for stock based employee benefit plans	78		(2)		80
Common stock issued for stock options (in shares)		62
Common stock issued for stock options	647	$ 5	642
Increase (decrease) in shares during the period (in shares)		65
Period increase (decrease) in stockholders' equity	12,198	$ 5	2,095	17,912	80	(7,894)
Ending balance (in shares) at Mar. 31, 2018		46,983
Ending balance at Mar. 31, 2018	701,861	$ 4,698	663,727	47,825	(2,279)	(12,110)
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	31,548			22,705		8,843
Stock based compensation expense	2,129		2,129
Common stock issued for stock based employee benefit plans (in shares)		49
Common stock issued for stock based employee benefit plans	(1,584)	$ 5	(14)		(1,575)
Common stock issued for stock options (in shares)		4
Common stock issued for stock options	64	$ 0	64
Increase (decrease) in shares during the period (in shares)		53
Period increase (decrease) in stockholders' equity	32,157	$ 5	2,179	22,705	(1,575)	8,843
Ending balance (in shares) at Mar. 31, 2019		51,414
Ending balance at Mar. 31, 2019	$ 896,424	$ 5,141	$ 780,680	$ 119,779	$ (4,959)	$ (4,217)

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Basis of Presentation: The accompanying unaudited condensed consolidated financial statements of Seacoast Banking Corporation of Florida and its subsidiaries (the "Company") have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Certain prior period amounts have been reclassified to conform to the current period presentation. Operating results for the three months ended March 31, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019 or any other period. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 . Adoption of new accounting pronouncements: On January 1, 2019, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-02, “Leases”, and all the related amendments (collectively, Accounting Standards Codification “ASC” Topic 842) through a cumulative-effect adjustment. The new guidance requires a lessee to recognize at the transition date right-of-use assets ("ROUA") and lease liabilities for all operating leases. Upon adoption, the Company recognized ROUAs of $29 million and lease liabilities of $33 million . Operating lease liabilities are measured based on the present value of lease payments over the lease term. At the transition date, ROUA was determined by adjusting lease liabilities for the carrying balances of deferred rent under ASC Topic 840 Leases , cease-use liabilities under ASC Topic 420 Exit or Disposal Cost Obligations , and assets and liabilities recognized under ASC Topic 805 Business Combinations for acquired operating leases, which aggregated to $4 million . We determine if an arrangement is a lease at the inception of a lease. ROUAs represent our right to use the underlying asset and lease liabilities represent our 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 our leases do not provide an implicit rate, we use our 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 we will exercise that option. 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. The Company elected certain practical expedients offered by the FASB for all classes of leased assets. As a result, the Company has not reassessed whether existing contracts are or contain leases, nor has the Company reassessed the classification of existing leases. The Company elected not to separate lease and non-lease components and instead accounts for them as a single lease component. The Company also elected to exclude short-term leases from the recognition of right-of-use assets and lease liabilities. Therefore, if the lease term is equal to or less than twelve months (including the renewal options that we are reasonably certain to exercise) and we are not reasonably certain to exercise any available purchase options in the lease, we do not apply the new lease accounting guidance for those leases. The Company did not elect the hindsight practical expedient, which allows entities to use hindsight when determining lease term and impairment of right-of-use assets. On January 1, 2019, we adopted ASU 2017-12 “Derivatives and Hedging" (Topic 815): Targeted Improvements to Accounting for Hedging Activities. Upon adoption, we reclassified certain debt securities from held to maturity to available for sale. The following table summarizes the impact: January 1, 2019 (In thousands) Amortized Cost Net Unrealized Gain (Loss) Reflected in OCI Fair Value Private mortgage-backed securities and collateralized mortgage obligations $ 21,526 $ 147 $ 21,673 Collateralized loan obligations 32,000 (877 ) 31,123 Totals $ 53,526 $ (730 ) $ 52,796 Use of Estimates: The preparation of these condensed consolidated financial statements requires management to make judgments in the application of certain of its accounting policies that involve significant estimates and assumptions. We have established policies and control procedures that are intended to ensure valuation methods are well controlled and applied consistently from period to period. These estimates and assumptions, which may materially affect the reported amounts of certain assets, liabilities, revenues and expenses, are based on information available as of the date of the financial statements, and changes in this information over time and the use of revised estimates and assumptions could materially affect amounts reported in subsequent financial statements. Specific areas, among others, requiring the application of management’s estimates include determination of the allowance for loan losses, acquisition accounting and purchased loans, intangible assets and impairment testing, other fair value adjustments, other than temporary impairment of securities, income taxes and realization of deferred tax assets and contingent liabilities.

Recently Issued Accounting Stan

Recently Issued Accounting Standards, Not Yet Adopted	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Recently Issued Accounting Standards, Not Yet Adopted	Recently Issued Accounting Standards, Not Yet Adopted The following provides a brief description of accounting standards that have been issued but are not yet adopted that could have a material effect on the Company's financial statements: ASU 2016-13, Financial Instruments –Credit Losses (Topic 326) Description In June 2016, FASB issued guidance to replace the incurred loss model with an expected loss model, which is referred to as the current expected credit loss (CECL) model. The CECL model is applicable to the measurement of credit losses on financial assets measured at amortized cost, including loan receivables and held to maturity debt securities. It also applies to off-balance sheet credit exposures not accounted for as insurance (i.e. loan commitments, standby letters of credit, financial guarantees and other similar instruments). Date of Adoption This amendment is effective for public business entities for reporting periods beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted only as of annual reporting periods after December 15, 2018, including interim reporting periods within that period. Effect on the Consolidated Financial Statements The Company's transition oversight committee is in the process of validating the credit loss estimation models and related processes. Updates to business processes and the documentation of accounting policy decisions are ongoing. The Company may recognize an increase in the allowance for credit losses upon adoption, recorded as a one-time cumulative adjustment to retained earnings. However, the magnitude of the impact on the Company's consolidated financial statements has not yet been determined. The Company will adopt this accounting standard effective January 1, 2020. ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Description In January 2017, the FASB amended the existing guidance to simplify the goodwill impairment measurement test by eliminating Step 2. The amendment requires the Company to perform the goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognizing an impairment charge for the amount by which the carrying amount exceeds the fair value. Additionally, an entity should consider the tax effects from any tax deductible goodwill on the carrying amount when measuring the impairment loss. Date of Adoption This amendment is effective for public business entities for reporting periods beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted on annual goodwill impairment tests performed after January 1, 2017. Effect on the Consolidated Financial Statements The impact to the consolidated financial statements from the adoption of this pronouncement is not expected to be material.

Earnings per Share

Earnings per Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share Basic earnings per common share is computed by dividing net income available to common shareholders by the weighted average number of shares of common stock outstanding during the period. For the three months ended March 31, 2019 , options to purchase 487,000 shares were antidilutive and accordingly were excluded in the computation of diluted earnings per share, compared to 274,000 shares for the three months ended March 31, 2018 . Three Months Ended March 31, (Dollars in thousands, except per share data) 2019 2018 Basic earnings per share Net income $ 22,705 $ 18,027 Average common shares outstanding 51,359 46,952 Net income per share $ 0.44 $ 0.38 Diluted earnings per share Net income $ 22,705 $ 18,027 Average common shares outstanding 51,359 46,952 Add: Dilutive effect of employee restricted stock and stock options 680 736 Average diluted shares outstanding 52,039 47,688 Net income per share $ 0.44 $ 0.38

Securities

Securities	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity at March 31, 2019 and December 31, 2018 are summarized as follows: March 31, 2019 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Sponsored Entities $ 6,296 $ 105 $ (4 ) $ 6,397 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 528,404 1,777 (6,228 ) 523,953 Private mortgage-backed securities and collateralized mortgage obligations 67,206 968 (239 ) 67,935 Collateralized loan obligations 243,546 2 (1,809 ) 241,739 Obligations of state and political subdivisions 37,105 621 (201 ) 37,525 Totals $ 882,557 $ 3,473 $ (8,481 ) $ 877,549 Debt securities held to maturity Mortgage-backed securities of U.S. Government Sponsored Entities $ 295,485 $ 356 $ (4,501 ) $ 291,340 Totals $ 295,485 $ 356 $ (4,501 ) $ 291,340 December 31, 2018 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Sponsored Entities $ 7,200 $ 106 $ (6 ) $ 7,300 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 567,753 300 (14,047 ) 554,006 Private mortgage-backed securities and collateralized mortgage obligations 55,569 560 (401 ) 55,728 Collateralized loan obligations 212,807 1 (3,442 ) 209,366 Obligations of state and political subdivisions 39,543 339 (451 ) 39,431 Totals $ 882,872 $ 1,306 $ (18,347 ) $ 865,831 Debt securities held to maturity Mortgage-backed securities of U.S. Government Sponsored Entities $ 304,423 $ — $ (7,324 ) $ 297,099 Private mortgage-backed securities and collateralized mortgage obligations 21,526 277 (130 ) 21,673 Collateralized loan obligations 32,000 — (877 ) 31,123 Totals $ 357,949 $ 277 $ (8,331 ) $ 349,895 Proceeds from sales of securities during the three months ended March 31, 2019 were $35.0 million , with gross gains of $0.2 million and gross losses of $0.3 million , which are included in "Securities losses, net" for the three months ended March 31, 2019 . Also included in “Securities losses, net” for the three months ended March 31, 2019 is an increase of $0.1 million , representing the change in the value of an investment in shares of a mutual fund that invests primarily in CRA-qualified debt securities. There were no sales of securities during the three month period ended March 31, 2018 . Included in “Securities losses, net” for the three month period ended March 31, 2018 , is a $0.1 million decline in the value of the CRA-qualified mutual fund investment. On January 1, 2019, the Company adopted ASU 2017-12 and subsequently transferred held to maturity debt securities with an amortized cost basis of $53.5 million to available for sale. Those securities had unrealized losses of $0.7 million that was recorded in other comprehensive income on the date of transfer. At March 31, 2019 , debt securities with a fair value of $122.3 million were pledged as collateral for United States Treasury deposits, other public deposits and trust deposits. Debt securities with a fair value of $148.0 million were pledged as collateral for repurchase agreements. The amortized cost and fair value of debt securities held to maturity and available for sale at March 31, 2019 , by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because prepayments of the underlying collateral for these securities may occur, due to the right to call or repay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately. Held to Maturity Available for Sale (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in less than one year $ — $ — $ 11,288 $ 11,268 Due after one year through five years — — 102,835 102,588 Due after five years through ten years — — 169,369 168,212 Due after ten years — — 3,455 3,593 — — 286,947 285,661 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 295,485 291,340 528,404 523,953 Private mortgage-backed securities and collateralized mortgage obligations — — 67,206 67,935 Totals $ 295,485 $ 291,340 $ 882,557 $ 877,549 The estimated fair value of a security is determined based on market quotations when available or, if not available, by using quoted market prices for similar securities, pricing models or discounted cash flows analyses, using observable market data where available. The tables below indicate the fair value of debt securities with unrealized losses and the period of time for which these losses were outstanding at March 31, 2019 and December 31, 2018 , respectively. March 31, 2019 Less Than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities and obligations of U.S. Government Sponsored Entities $ — — $ 545 $ (4 ) $ 545 $ (4 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 80,889 (512 ) 496,722 (10,217 ) 577,611 (10,729 ) Private mortgage-backed securities and collateralized mortgage obligations 20,061 (230 ) 2,038 (9 ) 22,099 (239 ) Collateralized loan obligations 238,777 (1,809 ) — — 238,777 (1,809 ) Obligations of state and political subdivisions — — 12,966 (201 ) 12,966 (201 ) Totals $ 339,727 $ (2,551 ) $ 512,271 $ (10,431 ) $ 851,998 $ (12,982 ) December 31, 2018 Less Than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities and obligations of U.S. Government Sponsored Entities $ 99 $ (1 ) $ 642 $ (5 ) $ 741 $ (6 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 200,184 (2,235 ) 623,420 (19,136 ) 823,604 (21,371 ) Private mortgage-backed securities and collateralized mortgage obligations 20,071 (344 ) 12,739 (187 ) 32,810 (531 ) Collateralized loan obligations 238,894 (4,319 ) — — 238,894 (4,319 ) Obligations of state and political subdivisions 19,175 (241 ) 9,553 (210 ) 28,728 (451 ) Totals $ 478,423 $ (7,140 ) $ 646,354 $ (19,538 ) $ 1,124,777 $ (26,678 ) The two tables above include debt securities held to maturity that were transferred from available for sale into held to maturity during 2014. Those securities had unrealized losses of $3.1 million at the date of transfer, and at March 31, 2019 , the unamortized balance was $0.6 million . At March 31, 2019 , the Company had $10.7 million of unrealized losses on mortgage-backed securities and collateralized mortgage obligations of government sponsored entities having a fair value of $577.6 million that were attributable to a combination of factors, including relative changes in interest rates since the time of purchase. The contractual cash flows for these securities are guaranteed by U.S. government agencies and U.S. government-sponsored enterprises. Based on the assessment of these mitigating factors, management believes that the unrealized losses on these debt security holdings are a function of changes in investment spreads and interest movements and not changes in credit quality. Management expects to recover the entire amortized cost basis of these securities. At March 31, 2019 , the Company had unrealized losses of $1.8 million on collateralized loan obligations with a fair value of $238.8 million . The collateral for these securities is first lien senior secured corporate debt. The Company holds senior tranches rated credit A or higher. Management expects to recover the entire amortized cost basis of these securities. At March 31, 2019 , the Company does not intend to sell debt securities that are in an unrealized loss position and it is not more than likely than not that the Company will be required to sell these securities before recovery of the amortized cost basis. Therefore, management does not consider any investment to be other-than-temporarily impaired at March 31, 2019 . Included in other assets at March 31, 2019 is $30.9 million of Federal Home Loan Bank and Federal Reserve Bank stock stated at par value. The Company has not identified events or changes in circumstances which may have a significant adverse effect on the fair value of these cost method investment securities. Also included in other assets is a $6.3 million investment in a mutual fund carried at fair value. The Company holds 11,330 shares of Visa Class B stock, which following resolution of Visa litigation will be converted to Visa Class A shares. Under the current conversion ratio that became effective June 28, 2018, the Company would receive 1.6298 shares of Class A stock for each share of Class B stock for a total of 18,466 shares of Visa Class A stock. Our ownership of Visa stock is related to prior ownership in Visa's network, while Visa operated as a cooperative. This ownership is recorded on our financial records at zero basis.

Loans

Loans	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Loans	Loans Information pertaining to portfolio loans, purchased credit impaired (“PCI”) loans, and purchased unimpaired loans (“PUL”) is as follows: March 31, 2019 (In thousands) Portfolio Loans PCI Loans PULs Total Construction and land development $ 308,846 $ 153 $ 108,566 $ 417,565 Commercial real estate 1,478,955 10,393 673,069 2,162,417 Residential real estate 1,077,523 2,575 249,068 1,329,166 Commercial and financial 606,179 667 106,033 712,879 Consumer 195,719 — 10,695 206,414 Totals 1 $ 3,667,222 $ 13,788 $ 1,147,431 $ 4,828,441 December 31, 2018 (In thousands) Portfolio Loans PCI Loans PULs Total Construction and land development $ 301,473 $ 151 $ 141,944 $ 443,568 Commercial real estate 1,437,989 10,828 683,249 2,132,066 Residential real estate 1,055,525 2,718 266,134 1,324,377 Commercial and financial 603,057 737 118,528 722,322 Consumer 190,207 — 12,674 202,881 Totals 1 $ 3,588,251 $ 14,434 $ 1,222,529 $ 4,825,214 1 Net loan balances as of March 31, 2019 and December 31, 2018 include deferred costs of $17.8 million and $16.9 million for each period, respectively. The following tables present the contractual delinquency of the recorded investment by class of loans as of: March 31, 2019 (In thousands) Current Accruing 30-59 Days Past Due Accruing 60-89 Days Past Due Accruing Greater Than 90 Days Nonaccrual Total Financing Receivables Portfolio Loans Construction and land development $ 308,819 $ — $ — $ — $ 27 $ 308,846 Commercial real estate 1,471,607 1,016 709 255 5,368 1,478,955 Residential real estate 1,068,869 612 65 — 7,977 1,077,523 Commercial and financial 599,068 3,724 1,350 81 1,956 606,179 Consumer 194,672 529 423 — 95 195,719 Total Portfolio Loans 3,643,035 5,881 2,547 336 15,423 3,667,222 Purchased Unimpaired Loans Construction and land development 108,566 — — — — 108,566 Commercial real estate 671,195 536 — — 1,338 673,069 Residential real estate 246,583 1,288 — 428 769 249,068 Commercial and financial 104,229 — — — 1,804 106,033 Consumer 10,664 — — — 31 10,695 Total PULs 1,141,237 1,824 — 428 3,942 1,147,431 Purchased Credit Impaired Loans Construction and land development 138 — — — 15 153 Commercial real estate 9,395 — — — 998 10,393 Residential real estate 558 — — — 2,017 2,575 Commercial and financial 649 — — — 18 667 Consumer — — — — — — Total PCI Loans 10,740 — — — 3,048 13,788 Total Loans $ 4,795,012 $ 7,705 $ 2,547 $ 764 $ 22,413 $ 4,828,441 December 31, 2018 (In thousands) Current Accruing 30-59 Days Past Due Accruing 60-89 Days Past Due Accruing Greater Than 90 Days Nonaccrual Total Financing Receivables Portfolio Loans Construction and land development $ 301,348 $ 97 $ — $ — $ 28 $ 301,473 Commercial real estate 1,427,413 3,852 97 141 6,486 1,437,989 Residential real estate 1,044,375 2,524 525 295 7,806 1,055,525 Commercial and financial 594,930 5,186 1,661 — 1,280 603,057 Consumer 189,061 637 326 — 183 190,207 Total Portfolio Loans 3,557,127 12,296 2,609 436 15,783 3,588,251 Purchased Unimpaired Loans Construction and land development 140,013 1,931 — — — 141,944 Commercial real estate 680,060 1,846 — — 1,343 683,249 Residential real estate 260,781 1,523 — 90 3,740 266,134 Commercial and financial 116,173 342 — — 2,013 118,528 Consumer 12,643 — 31 — — 12,674 Total PULs 1,209,670 5,642 31 90 7,096 1,222,529 Purchased Credit Impaired Loans Construction and land development 135 — — — 16 151 Commercial real estate 8,403 1,034 — — 1,391 10,828 Residential real estate 556 — — — 2,162 2,718 Commercial and financial 74 635 — — 28 737 Consumer — — — — — — Total PCI Loans 9,168 1,669 — — 3,597 14,434 Total Loans $ 4,775,965 $ 19,607 $ 2,640 $ 526 $ 26,476 $ 4,825,214 The Company's Credit Risk Management also utilizes an internal asset classification system as a means of identifying problem and potential problem loans. The following classifications are used to categorize loans under the internal classification system: • Pass: Loans that are not 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. • Doubtful: Loans that have all the weaknesses inherent in those classified Substandard with the added characteristic that the weakness present makes collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The principal balance of loans classified as doubtful are likely to be charged off. Risk ratings on commercial lending facilities are re-evaluated during the annual review process at a minimum, based on the size of the aggregate exposure, and/or when there is a credit action of the existing credit exposure. The following tables present the risk category of loans by class based on the most recent analysis performed as of: March 31, 2019 (In thousands) Pass Special Mention Substandard Doubtful Total Construction and land development $ 406,010 $ 11,262 $ 293 $ — $ 417,565 Commercial real estate 2,080,415 57,732 24,270 — 2,162,417 Residential real estate 1,304,847 3,953 20,366 — 1,329,166 Commercial and financial 696,837 9,013 7,029 — 712,879 Consumer 202,187 3,150 1,077 — 206,414 Totals $ 4,690,296 $ 85,110 $ 53,035 $ — $ 4,828,441 December 31, 2018 (In thousands) Pass Special Mention Substandard Doubtful Total Construction and land development $ 428,044 $ 10,429 $ 5,095 $ — $ 443,568 Commercial real estate 2,063,589 41,429 27,048 — 2,132,066 Residential real estate 1,296,634 3,654 24,089 — 1,324,377 Commercial and financial 707,663 8,387 6,247 25 722,322 Consumer 198,367 3,397 1,117 — 202,881 Totals $ 4,694,297 $ 67,296 $ 63,596 $ 25 $ 4,825,214 PCI Loans PCI loans are accounted for pursuant to ASC Topic 310-30. The excess of cash flows expected to be collected over the estimated fair value is referred to as the accretable yield and is recognized in interest income over the remaining life of the loan in situations where there is a reasonable expectation about the timing and amount of cash flows expected to be collected. The difference between the contractually required payments and the cash flows expected to be collected at acquisition, considering the impact of prepayments, is referred to as the non-accretable difference. The table below summarizes the changes in accretable yield on PCI loans for the periods ended: Three Months Ended March 31, (In thousands) 2019 2018 Beginning balance $ 2,924 $ 3,699 Additions — — Deletions — (43 ) Accretion (776 ) (443 ) Reclassification from non-accretable difference 460 339 Ending balance $ 2,608 $ 3,552 Troubled Debt Restructured Loans The Company’s Troubled Debt Restructuring (“TDR”) concessions granted to certain borrowers generally do not include forgiveness of principal balances, but may include interest rate reductions, an extension of the amortization period and/or converting the loan to interest only for a limited period of time. Loan modifications are not reported in calendar years after modification if the loans were modified at an interest rate equal to the yields of new loan originations with comparable risk and the loans are performing based on the terms of the restructured agreements. Most loans prior to modification were classified as impaired and the allowance for loan losses is determined in accordance with Company policy. During the three months ended March 31, 2019 , two loans were modified in a TDR totaling $2.0 million . There were no loans modified in a TDR during the three months ended March 31, 2018. No accruing loans that were restructured within the twelve months preceding March 31, 2019 defaulted during the twelve months ended March 31, 2019.The Company considers a loan to have defaulted when it becomes 90 days or more delinquent under the modified terms, has been transferred to nonaccrual status, or has been transferred to other real estate owned. A defaulted TDR is generally placed on nonaccrual and a specific allowance for loan loss is assigned in accordance with the Company’s policy. Impaired Loans Loans are considered impaired if they are 90 days or more past due, in nonaccrual status, or are TDRs. As of March 31, 2019 and December 31, 2018 , the Company’s recorded investment in impaired loans, excluding PCI loans, the unpaid principal balance and related valuation allowance was as follows: March 31, 2019 (In thousands) Recorded Investment Unpaid Principal Balance Related Valuation Allowance Impaired Loans with No Related Allowance Recorded: Construction and land development $ 15 $ 221 $ — Commercial real estate 5,136 6,406 — Residential real estate 10,294 14,873 — Commercial and financial 2,036 3,103 — Consumer 146 158 — Impaired Loans with an Allowance Recorded: Construction and land development 183 197 20 Commercial real estate 9,624 12,791 353 Residential real estate 5,688 5,820 577 Commercial and financial 2,024 2,020 1,329 Consumer 256 268 91 Total Impaired Loans Construction and land development 198 418 20 Commercial real estate 14,760 19,197 353 Residential real estate 15,982 20,693 577 Commercial and financial 4,060 5,123 1,329 Consumer 402 426 91 Totals $ 35,402 $ 45,857 $ 2,370 December 31, 2018 (In thousands) Recorded Investment Unpaid Principal Balance Related Valuation Allowance Impaired Loans with No Related Allowance Recorded: Construction and land development $ 15 $ 229 $ — Commercial real estate 3,852 5,138 — Residential real estate 13,510 18,111 — Commercial and financial 1,191 1,414 — Consumer 280 291 — Impaired Loans with an Allowance Recorded: Construction and land development 196 211 22 Commercial real estate 9,786 12,967 369 Residential real estate 5,537 5,664 805 Commercial and financial 2,131 2,309 1,498 Consumer 202 211 34 Total Impaired Loans Construction and land development 211 440 22 Commercial real estate 13,638 18,105 369 Residential real estate 19,047 23,775 805 Commercial and financial 3,322 3,723 1,498 Consumer 482 502 34 Totals $ 36,700 $ 46,545 $ 2,728 Impaired loans also include TDRs where concessions have been granted to borrowers who have experienced financial difficulty. At March 31, 2019 and at December 31, 2018 , accruing TDRs totaled $14.9 million and $13.3 million , respectively. Average impaired loans for the three months ended March 31, 2019 and 2018 were $36.3 million and $31.1 million , respectively. The impaired loans were measured for impairment based on the value of underlying collateral or the present value of expected future cash flows discounted at the loan’s effective interest rate. The valuation allowance is included in the allowance for loan losses. Interest payments received on impaired loans are recorded as interest income unless collection of the remaining recorded investment is doubtful, at which time payments received are recorded as reductions in principal. For the three months ended March 31, 2019 , and 2018 , the Company recorded interest income on impaired loans of $0.4 million and $0.4 million , respectively. For impaired loans whose impairment is measured based on the present value of expected future cash flows, interest income represents the change in present value attributable to the passage of time, and totaled $35,000 and $88,000 , for the three months ended March 31, 2019 and 2018 , respectively

Allowance for Loan Losses

Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Allowance for Loan Losses	Allowance for Loan Losses Activity in the allowance for loan losses for the three month periods ended March 31, 2019 and 2018 is summarized as follows: Three Months Ended March 31, 2019 (In thousands) Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance Construction & land development $ 2,233 $ 83 $ — $ 4 $ — $ 2,320 Commercial real estate 11,112 625 (16 ) 47 (15 ) 11,753 Residential real estate 7,775 (414 ) (36 ) 139 (19 ) 7,445 Commercial and financial 8,585 853 (944 ) 79 — 8,573 Consumer 2,718 250 (483 ) 247 (1 ) 2,731 Totals $ 32,423 $ 1,397 $ (1,479 ) $ 516 $ (35 ) $ 32,822 Three Months Ended March 31, 2018 (In thousands) Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance Construction & land development $ 1,642 $ 411 $ — $ 5 $ — $ 2,058 Commercial real estate 9,285 (575 ) — 147 (15 ) 8,842 Residential real estate 7,131 788 — 200 (72 ) 8,047 Commercial and financial 7,297 270 (198 ) 24 — 7,393 Consumer 1,767 191 (307 ) 128 (1 ) 1,778 Totals $ 27,122 $ 1,085 $ (505 ) $ 504 $ (88 ) $ 28,118 The allowance for loan losses is comprised of specific allowances for certain impaired loans and general allowances grouped into loan pools based on similar characteristics. The Company’s loan portfolio, excluding PCI loans, and related allowance at March 31, 2019 and December 31, 2018 is shown in the following tables: March 31, 2019 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction & land development $ 197 $ 20 $ 417,215 $ 2,300 $ 417,412 $ 2,320 Commercial real estate 14,760 353 2,137,264 11,400 2,152,024 11,753 Residential real estate 15,982 577 1,310,609 6,868 1,326,591 7,445 Commercial and financial 4,061 1,329 708,151 7,244 712,212 8,573 Consumer 402 91 206,012 2,640 206,414 2,731 Totals $ 35,402 $ 2,370 $ 4,779,251 $ 30,452 $ 4,814,653 $ 32,822 December 31, 2018 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction & land development $ 211 $ 22 $ 443,206 $ 2,211 $ 443,417 $ 2,233 Commercial real estate 13,638 369 2,107,600 10,743 2,121,238 11,112 Residential real estate 19,047 805 1,302,612 6,970 1,321,659 7,775 Commercial and financial 3,322 1,498 718,263 7,087 721,585 8,585 Consumer 482 34 202,399 2,684 202,881 2,718 Totals $ 36,700 $ 2,728 $ 4,774,080 $ 29,695 $ 4,810,780 $ 32,423 Loans collectively evaluated for impairment reported at March 31, 2019 included acquired loans that are not PCI loans. At March 31, 2019 , the remaining fair value adjustments for loans acquired was approximately $43.8 million, or approximately 3.8% of the outstanding aggregate PUL balances. At December 31, 2018 , the remaining fair value adjustments for loans acquired was approximately $47.0 million, or 3.9% of the outstanding aggregate PUL balances. These amounts are accreted into interest income over the remaining lives of the related loans on a level yield basis. The table below summarizes PCI loans that were individually evaluated for impairment based on expected cash flows at March 31, 2019 and December 31, 2018 : March 31, 2019 December 31, 2018 PCI Loans Individually Evaluated for Impairment (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction & land development $ 153 $ — $ 151 $ — Commercial real estate 10,393 — 10,828 — Residential real estate 2,575 — 2,718 — Commercial and financial 667 — 737 — Consumer — — — — Totals $ 13,788 $ — $ 14,434 $ —

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	3 Months Ended
	Mar. 31, 2019
Brokers and Dealers [Abstract]
Securities Sold Under Agreements to Repurchase	Securities Sold Under Agreements to Repurchase Securities sold under agreements to repurchase are accounted for as secured borrowings. For securities sold under agreements to repurchase, the Company is obligated to provide additional collateral in the event of a significant decline in fair value of collateral pledged. Company securities sold under agreements to repurchase and securities pledged were as follows by collateral type and maturity as of: (In thousands) March 31, 2019 December 31, 2018 Fair value of pledged securities - overnight and continuous: Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities $ 148,005 $ 214,323

Lease Commitments

Lease Commitments	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Lease Commitments	Lease Commitments The Company is the lessee in various noncancellable operating leases for land, buildings, and equipment. Certain leases contain provisions for variable lease payments that are linked to the consumer price index. Lease cost for the three months ended March 31, 2019 consists of: Three Months Ended (In thousands) March 31, 2019 Operating lease cost $ 1,405 Variable lease cost 306 Short-term lease cost 229 Sublease income (128 ) Total lease cost $ 1,812 The following table provides supplemental information related to leases as of and for the three months ended March 31, 2019: (In thousands, except for weighted average data) March 31, 2019 Operating lease right-of-use assets $ 28,052 Operating lease liabilities 32,270 Cash paid for amounts included in the measurement of operating lease liabilities 1,512 Right-of-use assets obtained in exchange for new operating lease obligations — Weighted average remaining lease term for operating leases 9 years Weighted average discount rate for operating leases 4.69 % 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 March 31, 2019 are as follows: (In thousands) Twelve Months Ended March 31, 2020 $ 5,902 2021 5,114 2022 4,698 2023 3,907 2024 3,445 Thereafter 17,027 Total undiscounted cash flows 40,093 Less: Net present value adjustment (7,823 ) Total $ 32,270

Noninterest Income and Expense

Noninterest Income and Expense	3 Months Ended
	Mar. 31, 2019
Brokers and Dealers [Abstract]
Noninterest Income and Expense	Noninterest Income and Expense Detail of noninterest income and expenses for the three months ended March 31, 2019 and 2018 are as follows: Three Months Ended March 31, (In thousands) 2019 2018 Noninterest income Service charges on deposit accounts $ 2,697 $ 2,672 Trust fees 1,017 1,021 Mortgage banking fees 1,115 1,402 Brokerage commissions and fees 436 359 Marine finance fees 362 573 Interchange income 3,401 2,942 BOLI income 915 1,056 SBA gains 636 734 Other income 2,266 1,639 12,845 12,398 Securities losses, net (9 ) (102 ) Total $ 12,836 $ 12,296 Noninterest expense Salaries and wages $ 18,506 $ 15,381 Employee benefits 4,206 3,081 Outsourced data processing costs 3,845 3,679 Telephone/data lines 811 612 Occupancy 3,807 3,117 Furniture and equipment 1,757 1,457 Marketing 1,132 1,252 Legal and professional fees 2,847 1,973 FDIC assessments 488 598 Amortization of intangibles 1,458 989 Foreclosed property expense and net (gain)/loss on sale (40 ) 192 Other 4,282 4,833 Total $ 43,099 $ 37,164

Equity Capital

Equity Capital	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Equity Capital	Equity Capital The Company is well capitalized and at March 31, 2019 , the Company and the Company’s principal banking subsidiary, Seacoast Bank, exceeded the common equity Tier 1 capital ratio (CET1) regulatory threshold of 6.5% for well-capitalized institutions under the Basel III standardized transition approach, as well as risk-based and leverage ratio requirements for well capitalized banks under the regulatory framework for prompt corrective action.

Contingent Liabilities

Contingent Liabilities	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Contingent Liabilities	Contingent Liabilities 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.

Fair Value

Fair Value	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Under ASC Topic 820, fair value measurements for items measured at fair value on a recurring and nonrecurring basis at March 31, 2019 and December 31, 2018 included: (In thousands) Fair Value Measurements Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2019 Available for sale debt securities 1 $ 877,549 $ 100 $ 877,449 $ — Loans held for sale 2 13,900 — 13,900 — Loans 3 8,312 — 2,102 6,210 Other real estate owned 4 11,921 — 313 11,608 Equity securities 5 6,283 6,283 — — December 31, 2018 Available for sale debt securities 1,5 $ 865,831 $ 100 $ 865,731 $ — Loans held for sale 2 11,873 — 11,873 — Loans 3 8,590 — 2,290 6,300 Other real estate owned 4 12,802 — 297 12,505 Equity securities 5 6,205 6,205 — — 1 See Note D for further detail of fair value of individual investment categories. 2 Recurring fair value basis determined using observable market data. 3 See Note E. Nonrecurring fair value adjustments to loans identified as impaired reflect full or partial write-downs that are based on the loan’s observable market price or current appraised value of the collateral in accordance with ASC Topic 310. 4 Fair value is measured on a nonrecurring basis in accordance with ASC Topic 360. 5 An investment in shares of a mutual fund that invests primarily in CRA-qualified debt securities, reported at fair value in Other Assets. Recurring fair value basis is determined using market quotations. Available for sale debt securities : U.S. Treasury securities are reported at fair value utilizing Level 1 inputs. Other securities are reported at fair value utilizing Level 2 inputs. The estimated fair value of a security is determined based on market quotations when available or, if not available, by using quoted market prices for similar securities, pricing models or discounted cash flow analyses, using observable market data where available. The Company reviews the prices supplied by independent pricing services, as well as their underlying pricing methodologies, for reasonableness and to ensure such prices are aligned with traditional pricing matrices. The fair value of collateralized loan obligations is determined from broker quotes. From time to time, the Company will validate, on a sample basis, prices supplied by the independent pricing service by comparison to prices obtained from other brokers and third-party sources or derived using internal models. Loans 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 that the fair value is the best indicator of the resolution of these loans. Interest income is recorded based on the contractual terms of the loan and in accordance with the Company’s policy on loans held for investment. None of the loans are 90 days or more past due or on nonaccrual as of March 31, 2019 and December 31, 2018 . The aggregate fair value and contractual balance of loans held for sale as of March 31, 2019 and December 31, 2018 is as follows: (In thousands) March 31, 2019 December 31, 2018 Aggregate fair value $ 13,900 $ 11,873 Contractual balance 13,399 11,562 Excess 501 311 Loans : Level 2 loans consist of impaired real estate loans which are collateral dependent. Fair value is based on recent real estate appraisals less estimated costs of sale. For residential real estate impaired loans, appraised values or internal evaluations are based on the comparative sales approach. Level 3 loans consist of commercial and commercial real estate impaired loans. For these loans evaluations may use either a single valuation approach or a combination of approaches, such as comparative sales, cost and/or income approach. A significant unobservable input in the income approach is the estimated capitalization rate for a given piece of collateral. At March 31, 2019 , the capitalization rates utilized to determine fair value of the underlying collateral averaged approximately 7.6% . Adjustments to comparable sales may be made by an appraiser to reflect local market conditions or other economic factors and may result in changes in the fair value of an asset over time. As such, the fair value of these impaired loans is considered level 3 in the fair value hierarchy. Impaired loans measured at fair value total $8.3 million with a specific reserve of $2.4 million at March 31, 2019 , compared to $8.6 million with a specific reserve of $2.7 million at December 31, 2018 . For loans classified as level 3, the changes included additions of $1.2 million related to loans that became impaired during 2019, offset by paydowns and chargeoffs of $1.3 million for the three months ended March 31, 2019 . Other real estate owned : When appraisals are used to determine fair value and the appraisals are based on a market approach, the fair value of other real estate owned (“OREO”) is classified as a level 2 input. When the fair value of OREO is based on appraisals which require significant adjustments to market-based valuation inputs or apply an income approach based on unobservable cash flows, the fair value of OREO is classified as Level 3. For OREO classified as level 3 during the three months ended March 31, 2019 , changes included reductions primarily consisting of sales of $1.3 million offset by the addition of foreclosed loans of $0.4 million . Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincides with the Company’s monthly and/or quarter-end valuation process. There were no such transfers for loans and OREO classified as level 3 during the three months ended March 31, 2019 and 2018 . The carrying amount and fair value of the Company’s other financial instruments that were not disclosed previously in the balance sheet and for which carrying amount is not fair value as of March 31, 2019 and December 31, 2018 is as follows: (In thousands) Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2019 Financial Assets Debt securities held to maturity 1 $ 295,485 $ — $ 291,340 $ — Time deposits with other banks 8,174 — — 8,105 Loans, net 4,787,307 — — 4,760,789 Financial Liabilities Deposit liabilities 5,605,578 — — 5,603,019 Federal Home Loan Bank (FHLB) borrowings 3,000 — — 3,000 Subordinated debt 70,874 — 61,039 — December 31, 2018 Financial Assets Debt securities held to maturity 1 $ 357,949 $ — $ 349,895 $ — Time deposits with other banks 8,243 — — 8,132 Loans, net 4,784,201 — — 4,835,248 Financial Liabilities Deposit liabilities 5,177,240 — — 5,172,098 Federal Home Loan Bank (FHLB) borrowings 380,000 — — 380,027 Subordinated debt 70,804 — 61,224 — 1 See Note D for further detail of 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, and securities sold under agreements to repurchase, maturing within 30 days. 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 March 31, 2019 and December 31, 2018 : Held to maturity debt securities : These debt securities are reported at fair value utilizing Level 2 inputs. The estimated fair value of a security is determined based on market quotations when available or, if not available, by using quoted market prices for similar securities, pricing models or discounted cash flow analyses, using observable market data where available. The Company reviews the prices supplied by independent pricing services, as well as their underlying pricing methodologies, for reasonableness and to ensure such prices are aligned with traditional pricing matrices. The fair value of collateralized loan obligations is determined from broker quotes. From time to time, the Company will validate, on a sample basis, prices supplied by the independent pricing service by comparison to prices obtained from other brokers and third-party sources or derived using internal models. Loans : Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial or mortgage. Each loan category is further segmented into fixed and adjustable rate interest terms as well as 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 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	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Business Combinations	Business Combinations Acquisition of First Green Bancorp, Inc. On October 19, 2018, the Company completed its acquisition of First Green Bancorp, Inc (“First Green”). Simultaneously, upon completion of the merger of First Green and the Company, First Green's wholly owned subsidiary bank, First Green Bank was merged with and into Seacoast Bank. Prior to the acquisition, First Green operated seven branches in the Orlando, Daytona, and Fort Lauderdale markets. As a result of this acquisition, the Company expects to enhance its presence in the Orlando, Daytona, and Fort Lauderdale markets, expand its customer base and leverage operating cost through economies of scale, and positively affect the Company’s operating results to the extent the Company earns more from interest earning assets than it pays in interest on its interest bearing liabilities. The Company acquired 100% of the outstanding common stock of First Green. Under the terms of the definitive agreement, each share of First Green common stock was converted into the right to receive 0.7324 shares of Seacoast common stock. (In thousands, except per share data) October 19, 2018 Shares exchanged for cash $ 5,462 Per share exchange ratio 0.7324 Number of shares of common stock issued 4,000 Multiplied by common stock price per share on October 19, 2018 $ 26.87 Value of common stock issued 107,486 Cash paid for First Green vested stock options 6,558 Total purchase price $ 114,044 The acquisition of First Green was accounted for under the acquisition method in accordance with ASC Topic 805, Business Combinations . The Company recognized goodwill of $56.7 million for this acquisition that is nondeductible for tax purposes. 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 are known. Determining fair values of assets and liabilities, especially the loan portfolio, core deposit intangibles, and deferred taxes, is a complicated process involving significant judgment regarding methods and assumptions used to calculate estimated fair values. The adjustments reflected in the table below are the result of information obtained subsequent to the initial measurement. (In thousands) Initially Measured October 19, 2018 Measurement Period Adjustments As Adjusted October 19, 2018 Assets: Cash $ 29,434 $ — $ 29,434 Investment securities 32,145 — 32,145 Loans, net 631,497 — 631,497 Fixed assets 16,828 — 16,828 Other real estate owned 410 — 410 Core deposit intangibles 10,170 (678 ) 9,492 Goodwill 56,198 506 56,704 Other assets 40,669 172 40,841 Totals $ 817,351 $ — $ 817,351 Liabilities: Deposits $ 624,289 $ — $ 624,289 Other liabilities 79,018 — 79,018 Totals $ 703,307 $ — $ 703,307 The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. October 19, 2018 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 101,674 $ 101,119 Commercial real estate 437,767 406,613 Construction/development/land 61,195 58,385 Commercial loans 56,288 54,973 Consumer and other loans 9,156 8,942 Purchased Credit Impaired 2,136 1,465 Total acquired loans $ 668,216 $ 631,497 For the loans acquired we first segregated all acquired loans with specifically identified credit deficiency factors. The factors we considered to identify loans as PCI loans were all acquired loans that were nonaccrual, 60 days or more past due, designated as TDR, graded “special mention” or “substandard.” These loans were then evaluated to determine estimated fair values as of the acquisition date. As required by generally accepted accounting principles, we are accounting for these loans pursuant to ASC Topic 310-30. The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of October 19, 2018 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. (In thousands) October 19, 2018 Contractually required principal and interest $ 2,136 Non-accretable difference (671 ) Cash flows expected to be collected 1,465 Accretable yield — Total purchased credit-impaired loan acquired $ 1,465 Loans without specifically identified credit deficiency factors are referred to as PULs for disclosure purposes. These loans were then evaluated to determine estimated fair values as of the acquisition date. Although no specific credit deficiencies were identifiable, we believe there is an element of risk as to whether all contractual cash flows will be eventually received. Factors that were considered included the economic environment both nationally and locally as well as the real estate market particularly in Florida. We have applied ASC Topic 310-20 accounting treatment to the PULs. The Company believes the deposits assumed from the acquisition have an intangible value. In determining the valuation amount, deposits were analyzed based on factors such as type of deposit, deposit retention, interest rates and age of deposit relationships. Pro-Forma Information Pro-forma data for the three months ended March 31, 2018 presents information as if the acquisition of First Green occurred at the beginning of 2018 , as follows: Three Months Ended March 31, (In thousands, except per share amounts) 2018 Net interest income $ 57,416 Net income 22,065 EPS - basic $ 0.43 EPS - diluted 0.43

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation: The accompanying unaudited condensed consolidated financial statements of Seacoast Banking Corporation of Florida and its subsidiaries (the "Company") have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Certain prior period amounts have been reclassified to conform to the current period presentation. Operating results for the three months ended March 31, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019 or any other period. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 .
Adoption of New Accounting Pronouncements and Recent Issued Accounting Standards, Not Yet Adopted	Adoption of new accounting pronouncements: On January 1, 2019, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-02, “Leases”, and all the related amendments (collectively, Accounting Standards Codification “ASC” Topic 842) through a cumulative-effect adjustment. The new guidance requires a lessee to recognize at the transition date right-of-use assets ("ROUA") and lease liabilities for all operating leases. Upon adoption, the Company recognized ROUAs of $29 million and lease liabilities of $33 million . Operating lease liabilities are measured based on the present value of lease payments over the lease term. At the transition date, ROUA was determined by adjusting lease liabilities for the carrying balances of deferred rent under ASC Topic 840 Leases , cease-use liabilities under ASC Topic 420 Exit or Disposal Cost Obligations , and assets and liabilities recognized under ASC Topic 805 Business Combinations for acquired operating leases, which aggregated to $4 million . We determine if an arrangement is a lease at the inception of a lease. ROUAs represent our right to use the underlying asset and lease liabilities represent our 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 our leases do not provide an implicit rate, we use our 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 we will exercise that option. 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. The Company elected certain practical expedients offered by the FASB for all classes of leased assets. As a result, the Company has not reassessed whether existing contracts are or contain leases, nor has the Company reassessed the classification of existing leases. The Company elected not to separate lease and non-lease components and instead accounts for them as a single lease component. The Company also elected to exclude short-term leases from the recognition of right-of-use assets and lease liabilities. Therefore, if the lease term is equal to or less than twelve months (including the renewal options that we are reasonably certain to exercise) and we are not reasonably certain to exercise any available purchase options in the lease, we do not apply the new lease accounting guidance for those leases. The Company did not elect the hindsight practical expedient, which allows entities to use hindsight when determining lease term and impairment of right-of-use assets. On January 1, 2019, we adopted ASU 2017-12 “Derivatives and Hedging" (Topic 815): Targeted Improvements to Accounting for Hedging Activities. Upon adoption, we reclassified certain debt securities from held to maturity to available for sale. The following table summarizes the impact: January 1, 2019 (In thousands) Amortized Cost Net Unrealized Gain (Loss) Reflected in OCI Fair Value Private mortgage-backed securities and collateralized mortgage obligations $ 21,526 $ 147 $ 21,673 Collateralized loan obligations 32,000 (877 ) 31,123 Totals $ 53,526 $ (730 ) $ 52,796 Recently Issued Accounting Standards, Not Yet Adopted The following provides a brief description of accounting standards that have been issued but are not yet adopted that could have a material effect on the Company's financial statements: ASU 2016-13, Financial Instruments –Credit Losses (Topic 326) Description In June 2016, FASB issued guidance to replace the incurred loss model with an expected loss model, which is referred to as the current expected credit loss (CECL) model. The CECL model is applicable to the measurement of credit losses on financial assets measured at amortized cost, including loan receivables and held to maturity debt securities. It also applies to off-balance sheet credit exposures not accounted for as insurance (i.e. loan commitments, standby letters of credit, financial guarantees and other similar instruments). Date of Adoption This amendment is effective for public business entities for reporting periods beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted only as of annual reporting periods after December 15, 2018, including interim reporting periods within that period. Effect on the Consolidated Financial Statements The Company's transition oversight committee is in the process of validating the credit loss estimation models and related processes. Updates to business processes and the documentation of accounting policy decisions are ongoing. The Company may recognize an increase in the allowance for credit losses upon adoption, recorded as a one-time cumulative adjustment to retained earnings. However, the magnitude of the impact on the Company's consolidated financial statements has not yet been determined. The Company will adopt this accounting standard effective January 1, 2020. ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Description In January 2017, the FASB amended the existing guidance to simplify the goodwill impairment measurement test by eliminating Step 2. The amendment requires the Company to perform the goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognizing an impairment charge for the amount by which the carrying amount exceeds the fair value. Additionally, an entity should consider the tax effects from any tax deductible goodwill on the carrying amount when measuring the impairment loss. Date of Adoption This amendment is effective for public business entities for reporting periods beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted on annual goodwill impairment tests performed after January 1, 2017. Effect on the Consolidated Financial Statements The impact to the consolidated financial statements from the adoption of this pronouncement is not expected to be material.
Use of Estimates	Use of Estimates: The preparation of these condensed consolidated financial statements requires management to make judgments in the application of certain of its accounting policies that involve significant estimates and assumptions. We have established policies and control procedures that are intended to ensure valuation methods are well controlled and applied consistently from period to period. These estimates and assumptions, which may materially affect the reported amounts of certain assets, liabilities, revenues and expenses, are based on information available as of the date of the financial statements, and changes in this information over time and the use of revised estimates and assumptions could materially affect amounts reported in subsequent financial statements. Specific areas, among others, requiring the application of management’s estimates include determination of the allowance for loan losses, acquisition accounting and purchased loans, intangible assets and impairment testing, other fair value adjustments, other than temporary impairment of securities, income taxes and realization of deferred tax assets and contingent liabilities.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Schedule of Reclassification of Debt Securities	Upon adoption, we reclassified certain debt securities from held to maturity to available for sale. The following table summarizes the impact: January 1, 2019 (In thousands) Amortized Cost Net Unrealized Gain (Loss) Reflected in OCI Fair Value Private mortgage-backed securities and collateralized mortgage obligations $ 21,526 $ 147 $ 21,673 Collateralized loan obligations 32,000 (877 ) 31,123 Totals $ 53,526 $ (730 ) $ 52,796

Earnings per Share (Tables)

Earnings per Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Three Months Ended March 31, (Dollars in thousands, except per share data) 2019 2018 Basic earnings per share Net income $ 22,705 $ 18,027 Average common shares outstanding 51,359 46,952 Net income per share $ 0.44 $ 0.38 Diluted earnings per share Net income $ 22,705 $ 18,027 Average common shares outstanding 51,359 46,952 Add: Dilutive effect of employee restricted stock and stock options 680 736 Average diluted shares outstanding 52,039 47,688 Net income per share $ 0.44 $ 0.38

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Fair Value of Securities Available for Sale	The amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity at March 31, 2019 and December 31, 2018 are summarized as follows: March 31, 2019 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Sponsored Entities $ 6,296 $ 105 $ (4 ) $ 6,397 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 528,404 1,777 (6,228 ) 523,953 Private mortgage-backed securities and collateralized mortgage obligations 67,206 968 (239 ) 67,935 Collateralized loan obligations 243,546 2 (1,809 ) 241,739 Obligations of state and political subdivisions 37,105 621 (201 ) 37,525 Totals $ 882,557 $ 3,473 $ (8,481 ) $ 877,549 Debt securities held to maturity Mortgage-backed securities of U.S. Government Sponsored Entities $ 295,485 $ 356 $ (4,501 ) $ 291,340 Totals $ 295,485 $ 356 $ (4,501 ) $ 291,340 December 31, 2018 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Sponsored Entities $ 7,200 $ 106 $ (6 ) $ 7,300 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 567,753 300 (14,047 ) 554,006 Private mortgage-backed securities and collateralized mortgage obligations 55,569 560 (401 ) 55,728 Collateralized loan obligations 212,807 1 (3,442 ) 209,366 Obligations of state and political subdivisions 39,543 339 (451 ) 39,431 Totals $ 882,872 $ 1,306 $ (18,347 ) $ 865,831 Debt securities held to maturity Mortgage-backed securities of U.S. Government Sponsored Entities $ 304,423 $ — $ (7,324 ) $ 297,099 Private mortgage-backed securities and collateralized mortgage obligations 21,526 277 (130 ) 21,673 Collateralized loan obligations 32,000 — (877 ) 31,123 Totals $ 357,949 $ 277 $ (8,331 ) $ 349,895
Summary of Amortized Cost and Fair Value of Held-to-Maturity Securities	The amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity at March 31, 2019 and December 31, 2018 are summarized as follows: March 31, 2019 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Sponsored Entities $ 6,296 $ 105 $ (4 ) $ 6,397 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 528,404 1,777 (6,228 ) 523,953 Private mortgage-backed securities and collateralized mortgage obligations 67,206 968 (239 ) 67,935 Collateralized loan obligations 243,546 2 (1,809 ) 241,739 Obligations of state and political subdivisions 37,105 621 (201 ) 37,525 Totals $ 882,557 $ 3,473 $ (8,481 ) $ 877,549 Debt securities held to maturity Mortgage-backed securities of U.S. Government Sponsored Entities $ 295,485 $ 356 $ (4,501 ) $ 291,340 Totals $ 295,485 $ 356 $ (4,501 ) $ 291,340 December 31, 2018 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Sponsored Entities $ 7,200 $ 106 $ (6 ) $ 7,300 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 567,753 300 (14,047 ) 554,006 Private mortgage-backed securities and collateralized mortgage obligations 55,569 560 (401 ) 55,728 Collateralized loan obligations 212,807 1 (3,442 ) 209,366 Obligations of state and political subdivisions 39,543 339 (451 ) 39,431 Totals $ 882,872 $ 1,306 $ (18,347 ) $ 865,831 Debt securities held to maturity Mortgage-backed securities of U.S. Government Sponsored Entities $ 304,423 $ — $ (7,324 ) $ 297,099 Private mortgage-backed securities and collateralized mortgage obligations 21,526 277 (130 ) 21,673 Collateralized loan obligations 32,000 — (877 ) 31,123 Totals $ 357,949 $ 277 $ (8,331 ) $ 349,895
Summary of Investments Classified by Contractual Maturity	The amortized cost and fair value of debt securities held to maturity and available for sale at March 31, 2019 , by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because prepayments of the underlying collateral for these securities may occur, due to the right to call or repay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately. Held to Maturity Available for Sale (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in less than one year $ — $ — $ 11,288 $ 11,268 Due after one year through five years — — 102,835 102,588 Due after five years through ten years — — 169,369 168,212 Due after ten years — — 3,455 3,593 — — 286,947 285,661 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 295,485 291,340 528,404 523,953 Private mortgage-backed securities and collateralized mortgage obligations — — 67,206 67,935 Totals $ 295,485 $ 291,340 $ 882,557 $ 877,549
Schedule of Debt Securities in Unrealized Loss Position	The tables below indicate the fair value of debt securities with unrealized losses and the period of time for which these losses were outstanding at March 31, 2019 and December 31, 2018 , respectively. March 31, 2019 Less Than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities and obligations of U.S. Government Sponsored Entities $ — — $ 545 $ (4 ) $ 545 $ (4 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 80,889 (512 ) 496,722 (10,217 ) 577,611 (10,729 ) Private mortgage-backed securities and collateralized mortgage obligations 20,061 (230 ) 2,038 (9 ) 22,099 (239 ) Collateralized loan obligations 238,777 (1,809 ) — — 238,777 (1,809 ) Obligations of state and political subdivisions — — 12,966 (201 ) 12,966 (201 ) Totals $ 339,727 $ (2,551 ) $ 512,271 $ (10,431 ) $ 851,998 $ (12,982 ) December 31, 2018 Less Than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities and obligations of U.S. Government Sponsored Entities $ 99 $ (1 ) $ 642 $ (5 ) $ 741 $ (6 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 200,184 (2,235 ) 623,420 (19,136 ) 823,604 (21,371 ) Private mortgage-backed securities and collateralized mortgage obligations 20,071 (344 ) 12,739 (187 ) 32,810 (531 ) Collateralized loan obligations 238,894 (4,319 ) — — 238,894 (4,319 ) Obligations of state and political subdivisions 19,175 (241 ) 9,553 (210 ) 28,728 (451 ) Totals $ 478,423 $ (7,140 ) $ 646,354 $ (19,538 ) $ 1,124,777 $ (26,678 )

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans	Information pertaining to portfolio loans, purchased credit impaired (“PCI”) loans, and purchased unimpaired loans (“PUL”) is as follows: March 31, 2019 (In thousands) Portfolio Loans PCI Loans PULs Total Construction and land development $ 308,846 $ 153 $ 108,566 $ 417,565 Commercial real estate 1,478,955 10,393 673,069 2,162,417 Residential real estate 1,077,523 2,575 249,068 1,329,166 Commercial and financial 606,179 667 106,033 712,879 Consumer 195,719 — 10,695 206,414 Totals 1 $ 3,667,222 $ 13,788 $ 1,147,431 $ 4,828,441 December 31, 2018 (In thousands) Portfolio Loans PCI Loans PULs Total Construction and land development $ 301,473 $ 151 $ 141,944 $ 443,568 Commercial real estate 1,437,989 10,828 683,249 2,132,066 Residential real estate 1,055,525 2,718 266,134 1,324,377 Commercial and financial 603,057 737 118,528 722,322 Consumer 190,207 — 12,674 202,881 Totals 1 $ 3,588,251 $ 14,434 $ 1,222,529 $ 4,825,214 1 Net loan balances as of March 31, 2019 and December 31, 2018 include deferred costs of $17.8 million and $16.9 million for each period, respectively.
Schedule of Past Due Financing Receivables	The following tables present the contractual delinquency of the recorded investment by class of loans as of: March 31, 2019 (In thousands) Current Accruing 30-59 Days Past Due Accruing 60-89 Days Past Due Accruing Greater Than 90 Days Nonaccrual Total Financing Receivables Portfolio Loans Construction and land development $ 308,819 $ — $ — $ — $ 27 $ 308,846 Commercial real estate 1,471,607 1,016 709 255 5,368 1,478,955 Residential real estate 1,068,869 612 65 — 7,977 1,077,523 Commercial and financial 599,068 3,724 1,350 81 1,956 606,179 Consumer 194,672 529 423 — 95 195,719 Total Portfolio Loans 3,643,035 5,881 2,547 336 15,423 3,667,222 Purchased Unimpaired Loans Construction and land development 108,566 — — — — 108,566 Commercial real estate 671,195 536 — — 1,338 673,069 Residential real estate 246,583 1,288 — 428 769 249,068 Commercial and financial 104,229 — — — 1,804 106,033 Consumer 10,664 — — — 31 10,695 Total PULs 1,141,237 1,824 — 428 3,942 1,147,431 Purchased Credit Impaired Loans Construction and land development 138 — — — 15 153 Commercial real estate 9,395 — — — 998 10,393 Residential real estate 558 — — — 2,017 2,575 Commercial and financial 649 — — — 18 667 Consumer — — — — — — Total PCI Loans 10,740 — — — 3,048 13,788 Total Loans $ 4,795,012 $ 7,705 $ 2,547 $ 764 $ 22,413 $ 4,828,441 December 31, 2018 (In thousands) Current Accruing 30-59 Days Past Due Accruing 60-89 Days Past Due Accruing Greater Than 90 Days Nonaccrual Total Financing Receivables Portfolio Loans Construction and land development $ 301,348 $ 97 $ — $ — $ 28 $ 301,473 Commercial real estate 1,427,413 3,852 97 141 6,486 1,437,989 Residential real estate 1,044,375 2,524 525 295 7,806 1,055,525 Commercial and financial 594,930 5,186 1,661 — 1,280 603,057 Consumer 189,061 637 326 — 183 190,207 Total Portfolio Loans 3,557,127 12,296 2,609 436 15,783 3,588,251 Purchased Unimpaired Loans Construction and land development 140,013 1,931 — — — 141,944 Commercial real estate 680,060 1,846 — — 1,343 683,249 Residential real estate 260,781 1,523 — 90 3,740 266,134 Commercial and financial 116,173 342 — — 2,013 118,528 Consumer 12,643 — 31 — — 12,674 Total PULs 1,209,670 5,642 31 90 7,096 1,222,529 Purchased Credit Impaired Loans Construction and land development 135 — — — 16 151 Commercial real estate 8,403 1,034 — — 1,391 10,828 Residential real estate 556 — — — 2,162 2,718 Commercial and financial 74 635 — — 28 737 Consumer — — — — — — Total PCI Loans 9,168 1,669 — — 3,597 14,434 Total Loans $ 4,775,965 $ 19,607 $ 2,640 $ 526 $ 26,476 $ 4,825,214
Schedule of Risk Categories of Loans by Class of Loans	Risk ratings on commercial lending facilities are re-evaluated during the annual review process at a minimum, based on the size of the aggregate exposure, and/or when there is a credit action of the existing credit exposure. The following tables present the risk category of loans by class based on the most recent analysis performed as of: March 31, 2019 (In thousands) Pass Special Mention Substandard Doubtful Total Construction and land development $ 406,010 $ 11,262 $ 293 $ — $ 417,565 Commercial real estate 2,080,415 57,732 24,270 — 2,162,417 Residential real estate 1,304,847 3,953 20,366 — 1,329,166 Commercial and financial 696,837 9,013 7,029 — 712,879 Consumer 202,187 3,150 1,077 — 206,414 Totals $ 4,690,296 $ 85,110 $ 53,035 $ — $ 4,828,441 December 31, 2018 (In thousands) Pass Special Mention Substandard Doubtful Total Construction and land development $ 428,044 $ 10,429 $ 5,095 $ — $ 443,568 Commercial real estate 2,063,589 41,429 27,048 — 2,132,066 Residential real estate 1,296,634 3,654 24,089 — 1,324,377 Commercial and financial 707,663 8,387 6,247 25 722,322 Consumer 198,367 3,397 1,117 — 202,881 Totals $ 4,694,297 $ 67,296 $ 63,596 $ 25 $ 4,825,214
Summary of Changes in Accretable Yield on PCI Loans	The table below summarizes the changes in accretable yield on PCI loans for the periods ended: Three Months Ended March 31, (In thousands) 2019 2018 Beginning balance $ 2,924 $ 3,699 Additions — — Deletions — (43 ) Accretion (776 ) (443 ) Reclassification from non-accretable difference 460 339 Ending balance $ 2,608 $ 3,552
Schedule of Impaired Financing Receivables, Excluding PCI Loans and Valuation Allowances	As of March 31, 2019 and December 31, 2018 , the Company’s recorded investment in impaired loans, excluding PCI loans, the unpaid principal balance and related valuation allowance was as follows: March 31, 2019 (In thousands) Recorded Investment Unpaid Principal Balance Related Valuation Allowance Impaired Loans with No Related Allowance Recorded: Construction and land development $ 15 $ 221 $ — Commercial real estate 5,136 6,406 — Residential real estate 10,294 14,873 — Commercial and financial 2,036 3,103 — Consumer 146 158 — Impaired Loans with an Allowance Recorded: Construction and land development 183 197 20 Commercial real estate 9,624 12,791 353 Residential real estate 5,688 5,820 577 Commercial and financial 2,024 2,020 1,329 Consumer 256 268 91 Total Impaired Loans Construction and land development 198 418 20 Commercial real estate 14,760 19,197 353 Residential real estate 15,982 20,693 577 Commercial and financial 4,060 5,123 1,329 Consumer 402 426 91 Totals $ 35,402 $ 45,857 $ 2,370 December 31, 2018 (In thousands) Recorded Investment Unpaid Principal Balance Related Valuation Allowance Impaired Loans with No Related Allowance Recorded: Construction and land development $ 15 $ 229 $ — Commercial real estate 3,852 5,138 — Residential real estate 13,510 18,111 — Commercial and financial 1,191 1,414 — Consumer 280 291 — Impaired Loans with an Allowance Recorded: Construction and land development 196 211 22 Commercial real estate 9,786 12,967 369 Residential real estate 5,537 5,664 805 Commercial and financial 2,131 2,309 1,498 Consumer 202 211 34 Total Impaired Loans Construction and land development 211 440 22 Commercial real estate 13,638 18,105 369 Residential real estate 19,047 23,775 805 Commercial and financial 3,322 3,723 1,498 Consumer 482 502 34 Totals $ 36,700 $ 46,545 $ 2,728

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Schedule of Allowance for Loan Losses	Activity in the allowance for loan losses for the three month periods ended March 31, 2019 and 2018 is summarized as follows: Three Months Ended March 31, 2019 (In thousands) Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance Construction & land development $ 2,233 $ 83 $ — $ 4 $ — $ 2,320 Commercial real estate 11,112 625 (16 ) 47 (15 ) 11,753 Residential real estate 7,775 (414 ) (36 ) 139 (19 ) 7,445 Commercial and financial 8,585 853 (944 ) 79 — 8,573 Consumer 2,718 250 (483 ) 247 (1 ) 2,731 Totals $ 32,423 $ 1,397 $ (1,479 ) $ 516 $ (35 ) $ 32,822 Three Months Ended March 31, 2018 (In thousands) Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance Construction & land development $ 1,642 $ 411 $ — $ 5 $ — $ 2,058 Commercial real estate 9,285 (575 ) — 147 (15 ) 8,842 Residential real estate 7,131 788 — 200 (72 ) 8,047 Commercial and financial 7,297 270 (198 ) 24 — 7,393 Consumer 1,767 191 (307 ) 128 (1 ) 1,778 Totals $ 27,122 $ 1,085 $ (505 ) $ 504 $ (88 ) $ 28,118
Schedule of Loan Portfolio, Excluding PCI Loans and Related Allowance	The Company’s loan portfolio, excluding PCI loans, and related allowance at March 31, 2019 and December 31, 2018 is shown in the following tables: March 31, 2019 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction & land development $ 197 $ 20 $ 417,215 $ 2,300 $ 417,412 $ 2,320 Commercial real estate 14,760 353 2,137,264 11,400 2,152,024 11,753 Residential real estate 15,982 577 1,310,609 6,868 1,326,591 7,445 Commercial and financial 4,061 1,329 708,151 7,244 712,212 8,573 Consumer 402 91 206,012 2,640 206,414 2,731 Totals $ 35,402 $ 2,370 $ 4,779,251 $ 30,452 $ 4,814,653 $ 32,822 December 31, 2018 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction & land development $ 211 $ 22 $ 443,206 $ 2,211 $ 443,417 $ 2,233 Commercial real estate 13,638 369 2,107,600 10,743 2,121,238 11,112 Residential real estate 19,047 805 1,302,612 6,970 1,321,659 7,775 Commercial and financial 3,322 1,498 718,263 7,087 721,585 8,585 Consumer 482 34 202,399 2,684 202,881 2,718 Totals $ 36,700 $ 2,728 $ 4,774,080 $ 29,695 $ 4,810,780 $ 32,423 The table below summarizes PCI loans that were individually evaluated for impairment based on expected cash flows at March 31, 2019 and December 31, 2018 : March 31, 2019 December 31, 2018 PCI Loans Individually Evaluated for Impairment (In thousands) Recorded Investment Associated Allowance Recorded Investment Associated Allowance Construction & land development $ 153 $ — $ 151 $ — Commercial real estate 10,393 — 10,828 — Residential real estate 2,575 — 2,718 — Commercial and financial 667 — 737 — Consumer — — — — Totals $ 13,788 $ — $ 14,434 $ —

Securities Sold Under Agreeme_2

Securities Sold Under Agreements to Repurchase (Tables)	3 Months Ended
	Mar. 31, 2019
Brokers and Dealers [Abstract]
Schedule of Securities Sold Under Agreements to Repurchase and Securities Pledged	Company securities sold under agreements to repurchase and securities pledged were as follows by collateral type and maturity as of: (In thousands) March 31, 2019 December 31, 2018 Fair value of pledged securities - overnight and continuous: Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities $ 148,005 $ 214,323

Lease Commitments (Tables)

Lease Commitments (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Schedule of Supplemental Lease Cost Information Related to Operating Leases	Lease cost for the three months ended March 31, 2019 consists of: Three Months Ended (In thousands) March 31, 2019 Operating lease cost $ 1,405 Variable lease cost 306 Short-term lease cost 229 Sublease income (128 ) Total lease cost $ 1,812 The following table provides supplemental information related to leases as of and for the three months ended March 31, 2019: (In thousands, except for weighted average data) March 31, 2019 Operating lease right-of-use assets $ 28,052 Operating lease liabilities 32,270 Cash paid for amounts included in the measurement of operating lease liabilities 1,512 Right-of-use assets obtained in exchange for new operating lease obligations — Weighted average remaining lease term for operating leases 9 years Weighted average discount rate for operating leases 4.69 %
Schedule of Supplemental Balance Sheet Information Related to Operating Leases	The following table provides supplemental information related to leases as of and for the three months ended March 31, 2019: (In thousands, except for weighted average data) March 31, 2019 Operating lease right-of-use assets $ 28,052 Operating lease liabilities 32,270 Cash paid for amounts included in the measurement of operating lease liabilities 1,512 Right-of-use assets obtained in exchange for new operating lease obligations — Weighted average remaining lease term for operating leases 9 years Weighted average discount rate for operating leases 4.69 %
Schedule of Maturities of Lease Liabilities	(In thousands) Twelve Months Ended March 31, 2020 $ 5,902 2021 5,114 2022 4,698 2023 3,907 2024 3,445 Thereafter 17,027 Total undiscounted cash flows 40,093 Less: Net present value adjustment (7,823 ) Total $ 32,270

Noninterest Income and Expense

Noninterest Income and Expense (Tables)	3 Months Ended
	Mar. 31, 2019
Brokers and Dealers [Abstract]
Summary of Noninterest Income and Expense	Detail of noninterest income and expenses for the three months ended March 31, 2019 and 2018 are as follows: Three Months Ended March 31, (In thousands) 2019 2018 Noninterest income Service charges on deposit accounts $ 2,697 $ 2,672 Trust fees 1,017 1,021 Mortgage banking fees 1,115 1,402 Brokerage commissions and fees 436 359 Marine finance fees 362 573 Interchange income 3,401 2,942 BOLI income 915 1,056 SBA gains 636 734 Other income 2,266 1,639 12,845 12,398 Securities losses, net (9 ) (102 ) Total $ 12,836 $ 12,296 Noninterest expense Salaries and wages $ 18,506 $ 15,381 Employee benefits 4,206 3,081 Outsourced data processing costs 3,845 3,679 Telephone/data lines 811 612 Occupancy 3,807 3,117 Furniture and equipment 1,757 1,457 Marketing 1,132 1,252 Legal and professional fees 2,847 1,973 FDIC assessments 488 598 Amortization of intangibles 1,458 989 Foreclosed property expense and net (gain)/loss on sale (40 ) 192 Other 4,282 4,833 Total $ 43,099 $ 37,164

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Schedule of Fair Value of 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 March 31, 2019 and December 31, 2018 included: (In thousands) Fair Value Measurements Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2019 Available for sale debt securities 1 $ 877,549 $ 100 $ 877,449 $ — Loans held for sale 2 13,900 — 13,900 — Loans 3 8,312 — 2,102 6,210 Other real estate owned 4 11,921 — 313 11,608 Equity securities 5 6,283 6,283 — — December 31, 2018 Available for sale debt securities 1,5 $ 865,831 $ 100 $ 865,731 $ — Loans held for sale 2 11,873 — 11,873 — Loans 3 8,590 — 2,290 6,300 Other real estate owned 4 12,802 — 297 12,505 Equity securities 5 6,205 6,205 — — 1 See Note D for further detail of fair value of individual investment categories. 2 Recurring fair value basis determined using observable market data. 3 See Note E. Nonrecurring fair value adjustments to loans identified as impaired reflect full or partial write-downs that are based on the loan’s observable market price or current appraised value of the collateral in accordance with ASC Topic 310. 4 Fair value is measured on a nonrecurring basis in accordance with ASC Topic 360. 5 An investment in shares of a mutual fund that invests primarily in CRA-qualified debt securities, reported at fair value in Other Assets. Recurring fair value basis is determined using market quotations.
Schedule of Aggregate Fair Value and Contractual Balance of Loans for Sale	The aggregate fair value and contractual balance of loans held for sale as of March 31, 2019 and December 31, 2018 is as follows: (In thousands) March 31, 2019 December 31, 2018 Aggregate fair value $ 13,900 $ 11,873 Contractual balance 13,399 11,562 Excess 501 311
Schedule of Carrying Amount and Fair Value of Other Significant Financial Instruments Not Measured on a Recurring Basis	The carrying amount and fair value of the Company’s other financial instruments that were not disclosed previously in the balance sheet and for which carrying amount is not fair value as of March 31, 2019 and December 31, 2018 is as follows: (In thousands) Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2019 Financial Assets Debt securities held to maturity 1 $ 295,485 $ — $ 291,340 $ — Time deposits with other banks 8,174 — — 8,105 Loans, net 4,787,307 — — 4,760,789 Financial Liabilities Deposit liabilities 5,605,578 — — 5,603,019 Federal Home Loan Bank (FHLB) borrowings 3,000 — — 3,000 Subordinated debt 70,874 — 61,039 — December 31, 2018 Financial Assets Debt securities held to maturity 1 $ 357,949 $ — $ 349,895 $ — Time deposits with other banks 8,243 — — 8,132 Loans, net 4,784,201 — — 4,835,248 Financial Liabilities Deposit liabilities 5,177,240 — — 5,172,098 Federal Home Loan Bank (FHLB) borrowings 380,000 — — 380,027 Subordinated debt 70,804 — 61,224 — 1 See Note D for further detail of individual investment categories.

Business Combinations (Tables)

Business Combinations (Tables)	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Summary of Purchase Price Calculation	(In thousands, except per share data) October 19, 2018 Shares exchanged for cash $ 5,462 Per share exchange ratio 0.7324 Number of shares of common stock issued 4,000 Multiplied by common stock price per share on October 19, 2018 $ 26.87 Value of common stock issued 107,486 Cash paid for First Green vested stock options 6,558 Total purchase price $ 114,044
Schedule of Business Acquisitions	The adjustments reflected in the table below are the result of information obtained subsequent to the initial measurement. (In thousands) Initially Measured October 19, 2018 Measurement Period Adjustments As Adjusted October 19, 2018 Assets: Cash $ 29,434 $ — $ 29,434 Investment securities 32,145 — 32,145 Loans, net 631,497 — 631,497 Fixed assets 16,828 — 16,828 Other real estate owned 410 — 410 Core deposit intangibles 10,170 (678 ) 9,492 Goodwill 56,198 506 56,704 Other assets 40,669 172 40,841 Totals $ 817,351 $ — $ 817,351 Liabilities: Deposits $ 624,289 $ — $ 624,289 Other liabilities 79,018 — 79,018 Totals $ 703,307 $ — $ 703,307
Schedule of Fair Value of Acquired Loans and Unpaid Principal Balance	The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. October 19, 2018 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 101,674 $ 101,119 Commercial real estate 437,767 406,613 Construction/development/land 61,195 58,385 Commercial loans 56,288 54,973 Consumer and other loans 9,156 8,942 Purchased Credit Impaired 2,136 1,465 Total acquired loans $ 668,216 $ 631,497
Schedule of Contractually Required Principal and Interest Payments Adjusted for Estimated Prepayments	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of October 19, 2018 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. (In thousands) October 19, 2018 Contractually required principal and interest $ 2,136 Non-accretable difference (671 ) Cash flows expected to be collected 1,465 Accretable yield — Total purchased credit-impaired loan acquired $ 1,465
Summary of Pro-Forma Data	Pro-forma data for the three months ended March 31, 2018 presents information as if the acquisition of First Green occurred at the beginning of 2018 , as follows: Three Months Ended March 31, (In thousands, except per share amounts) 2018 Net interest income $ 57,416 Net income 22,065 EPS - basic $ 0.43 EPS - diluted 0.43

Basis of Presentation - Narrati

Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Accounting Policies [Line Items]
Operating lease right-of-use assets	$ 28,052
Operating lease liabilities	$ 32,270
Accounting Standards Update 2016-02
Accounting Policies [Line Items]
Operating lease right-of-use assets		$ 29,000
Operating lease liabilities		33,000
Right-of-use assets recognized from acquired operating leases		4,000
Liabilities recognized from acquired operating leases		$ 4,000

Basis of Presentation - Schedul

Basis of Presentation - Schedule of Reclassification of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Held to maturity, amortized cost	$ 882,557		$ 882,872
Available for sale, fair value	877,549		865,831
Private mortgage-backed securities and collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Held to maturity, amortized cost	67,206		55,569
Available for sale, fair value	67,935		55,728
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Held to maturity, amortized cost	243,546		212,807
Available for sale, fair value	$ 241,739		$ 209,366
Accounting Standards Update 2017-12
Schedule of Available-for-sale Securities [Line Items]
Held to maturity, amortized cost		$ 53,526
Net Unrealized Gain (Loss) Reflected in OCI		(730)
Available for sale, fair value		52,796
Accounting Standards Update 2017-12 | Private mortgage-backed securities and collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Held to maturity, amortized cost		21,526
Net Unrealized Gain (Loss) Reflected in OCI		147
Available for sale, fair value		21,673
Accounting Standards Update 2017-12 | Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Held to maturity, amortized cost		32,000
Net Unrealized Gain (Loss) Reflected in OCI		(877)
Available for sale, fair value		$ 31,123

Earnings per Share - Narrative

Earnings per Share - Narrative (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Antidilutive securities excluded from diluted earnings per share calculation (in shares)	487,000	274,000

Earnings per Share - Schedule o

Earnings per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic earnings per share
Net income	$ 22,705	$ 18,027
Average common shares outstanding (in shares)	51,359	46,952
Net income per share (in dollars per share)	$ 0.44	$ 0.38
Diluted earnings per share
Average common shares outstanding (in shares)	51,359	46,952
Add: Dilutive effect of employee restricted stock and stock options (in shares)	680	736
Average diluted shares outstanding (in shares)	52,039	47,688
Net income per share (in dollars per share)	$ 0.44	$ 0.38

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt securities available for sale
Available for sale, amortized cost, total	$ 882,557	$ 882,872
Available for sale, gross unrealized gains	3,473	1,306
Available for sale, gross unrealized losses	(8,481)	(18,347)
Available for sale, fair value	877,549	865,831
Debt securities held to maturity
Held to maturity, amortized cost, total	295,485	357,949
Held to maturity, gross unrealized gains	356	277
Held to maturity, gross unrealized losses	(4,501)	(8,331)
Held to maturity, fair value	291,340	349,895
U.S. Treasury securities and obligations of U.S. Government Sponsored Entities
Debt securities available for sale
Available for sale, amortized cost, total	6,296	7,200
Available for sale, gross unrealized gains	105	106
Available for sale, gross unrealized losses	(4)	(6)
Available for sale, fair value	6,397	7,300
Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities
Debt securities available for sale
Available for sale, amortized cost, total	528,404	567,753
Available for sale, gross unrealized gains	1,777	300
Available for sale, gross unrealized losses	(6,228)	(14,047)
Available for sale, fair value	523,953	554,006
Debt securities held to maturity
Held to maturity, amortized cost, total	295,485	304,423
Held to maturity, gross unrealized gains	356	0
Held to maturity, gross unrealized losses	(4,501)	(7,324)
Held to maturity, fair value	291,340	297,099
Private mortgage-backed securities and collateralized mortgage obligations
Debt securities available for sale
Available for sale, amortized cost, total	67,206	55,569
Available for sale, gross unrealized gains	968	560
Available for sale, gross unrealized losses	(239)	(401)
Available for sale, fair value	67,935	55,728
Debt securities held to maturity
Held to maturity, amortized cost, total		21,526
Held to maturity, gross unrealized gains		277
Held to maturity, gross unrealized losses		(130)
Held to maturity, fair value	0	21,673
Collateralized loan obligations
Debt securities available for sale
Available for sale, amortized cost, total	243,546	212,807
Available for sale, gross unrealized gains	2	1
Available for sale, gross unrealized losses	(1,809)	(3,442)
Available for sale, fair value	241,739	209,366
Debt securities held to maturity
Held to maturity, amortized cost, total		32,000
Held to maturity, gross unrealized gains		0
Held to maturity, gross unrealized losses		(877)
Held to maturity, fair value		31,123
Obligations of state and political subdivisions
Debt securities available for sale
Available for sale, amortized cost, total	37,105	39,543
Available for sale, gross unrealized gains	621	339
Available for sale, gross unrealized losses	(201)	(451)
Available for sale, fair value	$ 37,525	$ 39,431

Securities - Narrative (Details

Securities - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sale of debt securities available for sale	$ 35,048	$ 0
Gross gains from sale of securities	200
Gross losses from sale of securities	(300)
Gain (loss) in investment in shares of mutual funds	100
Decline in mutual fund investment	9	$ 102
Held to maturity, amortized cost	882,557			$ 882,872
Unrealized losses from securities transferred from available for sale to held to maturity	3,100
Unamortized balance of securities transferred from available for sale to held to maturity	600
Unrealized losses on mortgage backed securities of government sponsored entities	12,982			26,678
Fair value of mortgage backed securities of government sponsored entities	851,998			$ 1,124,777
Other assets	30,900
Investment in mutual fund carried at fair value	$ 6,300
Shares held (in shares)	51,413,988			51,361,079
Visa | Common Class B
Schedule of Available-for-sale Securities [Line Items]
Shares held (in shares)	11,330
Visa | Common Class A
Schedule of Available-for-sale Securities [Line Items]
Conversion rate of Class A stock for each share of Class B stock (shares)	$ 1.6298
Shares issued (in shares)	18,465.634
CRA - Qualified Mutual Fund
Schedule of Available-for-sale Securities [Line Items]
Decline in mutual fund investment	$ 100
Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities
Schedule of Available-for-sale Securities [Line Items]
Held to maturity, amortized cost	528,404			$ 567,753
Unrealized losses on mortgage backed securities of government sponsored entities	10,729			21,371
Fair value of mortgage backed securities of government sponsored entities	577,611			823,604
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Held to maturity, amortized cost	286,947
Unrealized losses on mortgage backed securities of government sponsored entities	1,809			4,319
Fair value of mortgage backed securities of government sponsored entities	238,777			$ 238,894
Carrying Value | Public and Trust Deposits
Schedule of Available-for-sale Securities [Line Items]
Fair value of debt securities pledged as collateral	122,300
Carrying Value | Repurchase Agreement
Schedule of Available-for-sale Securities [Line Items]
Fair value of debt securities pledged as collateral	$ 148,000
Accounting Standards Update 2017-12
Schedule of Available-for-sale Securities [Line Items]
Held to maturity, amortized cost			$ 53,526
Net Unrealized Gain (Loss) Reflected in OCI			$ (730)

Securities - Amortized Cost a_2

Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held to maturity, amortized cost, total	$ 295,485	$ 357,949
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held to maturity, fair value, total	291,340	349,895
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	882,557	882,872
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	877,549	865,831
Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held to maturity, amortized cost, total	295,485
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held to maturity, fair value, total	291,340	297,099
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	528,404	567,753
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	523,953	554,006
Private mortgage-backed securities and collateralized mortgage obligations
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held to maturity, amortized cost, total	0
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held to maturity, fair value, total	0	21,673
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	67,206	55,569
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	67,935	$ 55,728
Collateralized loan obligations
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held to maturity, amortized cost, due in less than one year	0
Held to maturity, amortized cost, due after one year through five years	0
Held to maturity, amortized cost, due after five years through ten years	0
Held to maturity, amortized cost, due after ten years	0
Held to maturity, amortized cost, total	0
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held to maturity, fair value, due in less than one year	0
Held to maturity, fair value, due after one year through five years	0
Held to maturity, fair value, due after five years through ten years	0
Held to maturity, fair value, due after ten years	0
Held to maturity, fair value, total	0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, due in less than one year	11,288
Available for sale, amortized cost, due after one year through five years	102,835
Available for sale, amortized cost, due after five years through ten years	169,369
Available for sale, amortized cost, due after ten years	3,455
Available for sale, amortized cost, total	286,947
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, due in less than one year	11,268
Available for sale, fair value, due after one year through five years	102,588
Available for sale, fair value, due after five years through ten years	168,212
Available for sale, fair value, due after ten years	3,593
Available for sale, fair value, total	$ 285,661

Securities - Schedule of Unreal

Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value
Less Than 12 Months	$ 339,727	$ 478,423
12 Months or Longer	512,271	646,354
Total	851,998	1,124,777
Unrealized Losses
Less Than 12 Months	(2,551)	(7,140)
12 Months or Longer	(10,431)	(19,538)
Total	(12,982)	(26,678)
Collateralized loan obligations
Fair Value
Less Than 12 Months	238,777	238,894
12 Months or Longer	0	0
Total	238,777	238,894
Unrealized Losses
Less Than 12 Months	(1,809)	(4,319)
12 Months or Longer	0	0
Total	(1,809)	(4,319)
Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities
Fair Value
Less Than 12 Months	80,889	200,184
12 Months or Longer	496,722	623,420
Total	577,611	823,604
Unrealized Losses
Less Than 12 Months	(512)	(2,235)
12 Months or Longer	(10,217)	(19,136)
Total	(10,729)	(21,371)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	20,061	20,071
12 Months or Longer	2,038	12,739
Total	22,099	32,810
Unrealized Losses
Less Than 12 Months	(230)	(344)
12 Months or Longer	(9)	(187)
Total	(239)	(531)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months	0	19,175
12 Months or Longer	12,966	9,553
Total	12,966	28,728
Unrealized Losses
Less Than 12 Months	0	(241)
12 Months or Longer	(201)	(210)
Total	(201)	(451)
U.S. Treasury securities and obligations of U.S. Government Sponsored Entities
Fair Value
Less Than 12 Months	0	99
12 Months or Longer	545	642
Total	545	741
Unrealized Losses
Less Than 12 Months	0	(1)
12 Months or Longer	(4)	(5)
Total	$ (4)	$ (6)

Loans - Schedule of Portfolio L

Loans - Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 4,828,441	$ 4,825,214
Deferred costs	17,800	16,900
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	417,565	443,568
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,162,417	2,132,066
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,329,166	1,324,377
Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	712,879	722,322
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	206,414	202,881
Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,667,222	3,588,251
Portfolio Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	308,846	301,473
Portfolio Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,478,955	1,437,989
Portfolio Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,077,523	1,055,525
Portfolio Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	606,179	603,057
Portfolio Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	195,719	190,207
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	13,788	14,434
PCI Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	153	151
PCI Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	10,393	10,828
PCI Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,575	2,718
PCI Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	667	737
PCI Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0	0
PULs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,147,431	1,222,529
PULs | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	108,566	141,944
PULs | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	673,069	683,249
PULs | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	249,068	266,134
PULs | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	106,033	118,528
PULs | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 10,695	$ 12,674

Loans - Past Due Financing Rece

Loans - Past Due Financing Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 4,795,012	$ 4,775,965
Nonaccrual	22,413	26,476
Total Financing Receivables	4,828,441	4,825,214
Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	7,705	19,607
Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	2,547	2,640
Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	764	526
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Financing Receivables	417,565	443,568
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Financing Receivables	2,162,417	2,132,066
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Financing Receivables	1,329,166	1,324,377
Commercial and financial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Financing Receivables	712,879	722,322
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Financing Receivables	206,414	202,881
Portfolio Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,643,035	3,557,127
Nonaccrual	15,423	15,783
Total Financing Receivables	3,667,222	3,588,251
Portfolio Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	5,881	12,296
Portfolio Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	2,547	2,609
Portfolio Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	336	436
Portfolio Loans | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	308,819	301,348
Nonaccrual	27	28
Total Financing Receivables	308,846	301,473
Portfolio Loans | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	97
Portfolio Loans | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,471,607	1,427,413
Nonaccrual	5,368	6,486
Total Financing Receivables	1,478,955	1,437,989
Portfolio Loans | Commercial real estate | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,016	3,852
Portfolio Loans | Commercial real estate | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	709	97
Portfolio Loans | Commercial real estate | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	255	141
Portfolio Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,068,869	1,044,375
Nonaccrual	7,977	7,806
Total Financing Receivables	1,077,523	1,055,525
Portfolio Loans | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	612	2,524
Portfolio Loans | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	65	525
Portfolio Loans | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	295
Portfolio Loans | Commercial and financial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	599,068	594,930
Nonaccrual	1,956	1,280
Total Financing Receivables	606,179	603,057
Portfolio Loans | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	3,724	5,186
Portfolio Loans | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,350	1,661
Portfolio Loans | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	81	0
Portfolio Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	194,672	189,061
Nonaccrual	95	183
Total Financing Receivables	195,719	190,207
Portfolio Loans | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	529	637
Portfolio Loans | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	423	326
Portfolio Loans | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PULs
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,141,237	1,209,670
Nonaccrual	3,942	7,096
Total Financing Receivables	1,147,431	1,222,529
PULs | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,824	5,642
PULs | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	31
PULs | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	428	90
PULs | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	108,566	140,013
Nonaccrual	0	0
Total Financing Receivables	108,566	141,944
PULs | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	1,931
PULs | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PULs | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PULs | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	671,195	680,060
Nonaccrual	1,338	1,343
Total Financing Receivables	673,069	683,249
PULs | Commercial real estate | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	536	1,846
PULs | Commercial real estate | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PULs | Commercial real estate | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PULs | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	246,583	260,781
Nonaccrual	769	3,740
Total Financing Receivables	249,068	266,134
PULs | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,288	1,523
PULs | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PULs | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	428	90
PULs | Commercial and financial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	104,229	116,173
Nonaccrual	1,804	2,013
Total Financing Receivables	106,033	118,528
PULs | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	342
PULs | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PULs | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PULs | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	10,664	12,643
Nonaccrual	31	0
Total Financing Receivables	10,695	12,674
PULs | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PULs | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	31
PULs | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	10,740	9,168
Nonaccrual	3,048	3,597
Total Financing Receivables	13,788	14,434
Purchased Credit Impaired Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	1,669
Purchased Credit Impaired Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	138	135
Nonaccrual	15	16
Total Financing Receivables	153	151
Purchased Credit Impaired Loans | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	9,395	8,403
Nonaccrual	998	1,391
Total Financing Receivables	10,393	10,828
Purchased Credit Impaired Loans | Commercial real estate | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	1,034
Purchased Credit Impaired Loans | Commercial real estate | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Commercial real estate | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	558	556
Nonaccrual	2,017	2,162
Total Financing Receivables	2,575	2,718
Purchased Credit Impaired Loans | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Commercial and financial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	649	74
Nonaccrual	18	28
Total Financing Receivables	667	737
Purchased Credit Impaired Loans | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	635
Purchased Credit Impaired Loans | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	0	0
Nonaccrual	0	0
Total Financing Receivables	0	0
Purchased Credit Impaired Loans | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Credit Impaired Loans | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	$ 0	$ 0

Loans - Risk Categories of Loan

Loans - Risk Categories of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 4,828,441	$ 4,825,214
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	4,690,296	4,694,297
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	85,110	67,296
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	53,035	63,596
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	25
Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Loans	417,565	443,568
Construction and land development | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	406,010	428,044
Construction and land development | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	11,262	10,429
Construction and land development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	293	5,095
Construction and land development | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	2,162,417	2,132,066
Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	2,080,415	2,063,589
Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	57,732	41,429
Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	24,270	27,048
Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	1,329,166	1,324,377
Residential real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	1,304,847	1,296,634
Residential real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	3,953	3,654
Residential real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	20,366	24,089
Residential real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial and financial
Financing Receivable, Recorded Investment [Line Items]
Loans	712,879	722,322
Commercial and financial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	696,837	707,663
Commercial and financial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	9,013	8,387
Commercial and financial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	7,029	6,247
Commercial and financial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	25
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	206,414	202,881
Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	202,187	198,367
Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	3,150	3,397
Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	1,077	1,117
Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 0	$ 0

Loans - Changes in Accretable Y

Loans - Changes in Accretable Yield on PCI Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$ 2,924	$ 3,699
Additions	0	0
Deletions	0	(43)
Accretion	(776)	(443)
Reclassification from non-accretable difference	460	339
Ending balance	$ 2,608	$ 3,552

Loans - Narrative (Details)

Loans - Narrative (Details)	3 Months Ended
	Mar. 31, 2019USD ($)contract	Mar. 31, 2018USD ($)contract	Dec. 31, 2018USD ($)
Receivables [Abstract]
Number of loans under trouble debt restructuring | contract	2	0
Value of loans under trouble debt restructuring	$ 2,000,000	$ 0
Troubled debt restructuring outstanding amount	14,900,000		$ 13,300,000
Average impaired loans	36,300,000	31,100,000
Interest income recorded on impaired loans	400,000	400,000
Interest income related to impaired loans with impairment measured on present value of expected future cash flows	$ 35,000	$ 88,000

Loans - Impaired Financing Rece

Loans - Impaired Financing Receivables, Excluding PCI Loans and Valuation Allowances (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Recorded Investment
Total	$ 35,402	$ 36,700
Unpaid Principal Balance
Total	45,857	46,545
Related Valuation Allowance	2,370	2,728
Construction and land development
Recorded Investment
Impaired Loans with No Related Allowance Recorded	15	15
Impaired Loans with an Allowance Recorded	183	196
Total	198	211
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	221	229
Impaired Loans with an Allowance Recorded	197	211
Total	418	440
Related Valuation Allowance	20	22
Commercial real estate
Recorded Investment
Impaired Loans with No Related Allowance Recorded	5,136	3,852
Impaired Loans with an Allowance Recorded	9,624	9,786
Total	14,760	13,638
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	6,406	5,138
Impaired Loans with an Allowance Recorded	12,791	12,967
Total	19,197	18,105
Related Valuation Allowance	353	369
Residential real estate
Recorded Investment
Impaired Loans with No Related Allowance Recorded	10,294	13,510
Impaired Loans with an Allowance Recorded	5,688	5,537
Total	15,982	19,047
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	14,873	18,111
Impaired Loans with an Allowance Recorded	5,820	5,664
Total	20,693	23,775
Related Valuation Allowance	577	805
Commercial and financial
Recorded Investment
Impaired Loans with No Related Allowance Recorded	2,036	1,191
Impaired Loans with an Allowance Recorded	2,024	2,131
Total	4,060	3,322
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	3,103	1,414
Impaired Loans with an Allowance Recorded	2,020	2,309
Total	5,123	3,723
Related Valuation Allowance	1,329	1,498
Consumer
Recorded Investment
Impaired Loans with No Related Allowance Recorded	146	280
Impaired Loans with an Allowance Recorded	256	202
Total	402	482
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	158	291
Impaired Loans with an Allowance Recorded	268	211
Total	426	502
Related Valuation Allowance	$ 91	$ 34

Allowance for Loan Losses - Act

Allowance for Loan Losses - Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 32,423	$ 27,122
Provision for Loan Losses	1,397	1,085
Charge- Offs	(1,479)	(505)
Recoveries	516	504
TDR Allowance Adjustments	(35)	(88)
Ending Balance	32,822	28,118
Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,233	1,642
Provision for Loan Losses	83	411
Charge- Offs	0	0
Recoveries	4	5
TDR Allowance Adjustments	0	0
Ending Balance	2,320	2,058
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	11,112	9,285
Provision for Loan Losses	625	(575)
Charge- Offs	(16)	0
Recoveries	47	147
TDR Allowance Adjustments	(15)	(15)
Ending Balance	11,753	8,842
Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7,775	7,131
Provision for Loan Losses	(414)	788
Charge- Offs	(36)	0
Recoveries	139	200
TDR Allowance Adjustments	(19)	(72)
Ending Balance	7,445	8,047
Commercial and financial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	8,585	7,297
Provision for Loan Losses	853	270
Charge- Offs	(944)	(198)
Recoveries	79	24
TDR Allowance Adjustments	0	0
Ending Balance	8,573	7,393
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,718	1,767
Provision for Loan Losses	250	191
Charge- Offs	(483)	(307)
Recoveries	247	128
TDR Allowance Adjustments	(1)	(1)
Ending Balance	$ 2,731	$ 1,778

Allowance for Loan Losses - Sch

Allowance for Loan Losses - Schedule of Loan Portfolio, Excluding PCI Loans and Related Allowance (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Recorded Investment
Individually Evaluated for Impairment	$ 35,402	$ 36,700
Collectively Evaluated for Impairment	4,779,251	4,774,080
Total	4,814,653	4,810,780
Associated Allowance
Individually Evaluated for Impairment	2,370	2,728
Collectively Evaluated for Impairment	30,452	29,695
Total	32,822	32,423
PCI Loans
Recorded Investment
Individually Evaluated for Impairment	13,788	14,434
Associated Allowance
Individually Evaluated for Impairment	0	0
Construction and land development
Recorded Investment
Individually Evaluated for Impairment	197	211
Collectively Evaluated for Impairment	417,215	443,206
Total	417,412	443,417
Associated Allowance
Individually Evaluated for Impairment	20	22
Collectively Evaluated for Impairment	2,300	2,211
Total	2,320	2,233
Construction and land development | PCI Loans
Recorded Investment
Individually Evaluated for Impairment	153	151
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial real estate
Recorded Investment
Individually Evaluated for Impairment	14,760	13,638
Collectively Evaluated for Impairment	2,137,264	2,107,600
Total	2,152,024	2,121,238
Associated Allowance
Individually Evaluated for Impairment	353	369
Collectively Evaluated for Impairment	11,400	10,743
Total	11,753	11,112
Commercial real estate | PCI Loans
Recorded Investment
Individually Evaluated for Impairment	10,393	10,828
Associated Allowance
Individually Evaluated for Impairment	0	0
Residential real estate
Recorded Investment
Individually Evaluated for Impairment	15,982	19,047
Collectively Evaluated for Impairment	1,310,609	1,302,612
Total	1,326,591	1,321,659
Associated Allowance
Individually Evaluated for Impairment	577	805
Collectively Evaluated for Impairment	6,868	6,970
Total	7,445	7,775
Residential real estate | PCI Loans
Recorded Investment
Individually Evaluated for Impairment	2,575	2,718
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial and financial
Recorded Investment
Individually Evaluated for Impairment	4,061	3,322
Collectively Evaluated for Impairment	708,151	718,263
Total	712,212	721,585
Associated Allowance
Individually Evaluated for Impairment	1,329	1,498
Collectively Evaluated for Impairment	7,244	7,087
Total	8,573	8,585
Commercial and financial | PCI Loans
Recorded Investment
Individually Evaluated for Impairment	667	737
Associated Allowance
Individually Evaluated for Impairment	0	0
Consumer
Recorded Investment
Individually Evaluated for Impairment	402	482
Collectively Evaluated for Impairment	206,012	202,399
Total	206,414	202,881
Associated Allowance
Individually Evaluated for Impairment	91	34
Collectively Evaluated for Impairment	2,640	2,684
Total	2,731	2,718
Consumer | PCI Loans
Recorded Investment
Individually Evaluated for Impairment	0	0
Associated Allowance
Individually Evaluated for Impairment	$ 0	$ 0

Allowance for Loan Losses - Nar

Allowance for Loan Losses - Narrative (Details) - Loans - Bank Shares, Inc - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
Remaining fair value adjustment for loans acquired	$ 43.8	$ 47
Percentage of fair value adjustment for loans acquired	3.80%	3.90%

Securities Sold Under Agreeme_3

Securities Sold Under Agreements to Repurchase - Schedule of Securities Sold Under Agreements to Repurchase and Securities Pledged (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities
Securities Financing Transaction [Line Items]
Mortgage backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities	$ 148,005	$ 214,323

Lease Commitments - Lease Cost

Lease Commitments - Lease Cost Information Related to Operating Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 1,405
Variable lease cost	306
Short-term lease cost	229
Sublease income	(128)
Total lease cost	$ 1,812

Lease Commitments - Supplementa

Lease Commitments - Supplemental Balance Sheet and Cash Flow Information Related to Operating Leases (Details)	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease right-of-use assets	$ 28,052,000
Operating lease liabilities	32,270,000
Cash paid for amounts included in the measurement of operating lease liabilities	1,512,000
Right-of-use assets obtained in exchange for new operating lease obligations	$ 0
Weighted average remaining lease term for operating leases	9 years
Weighted average discount rate for operating leases	4.69%

Lease Commitments - Maturities

Lease Commitments - Maturities of Lease Liabilities (Details) $ in Thousands	Mar. 31, 2019USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	$ 5,902
2020	5,114
2021	4,698
2022	3,907
2023	3,445
Thereafter	17,027
Total undiscounted cash flows	40,093
Less: Net present value adjustment	(7,823)
Total	$ 32,270

Noninterest Income and Expens_2

Noninterest Income and Expense - Summary of Noninterest Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Noninterest income
Service charges on deposit accounts	$ 2,697	$ 2,672
Trust fees	1,017	1,021
Mortgage banking fees	1,115	1,402
Brokerage commissions and fees	436	359
Marine finance fees	362	573
Interchange income	3,401	2,942
BOLI income	915	1,056
SBA gains	636	734
Other income	2,266	1,639
Noninterest income, gross	12,845	12,398
Securities losses, net	(9)	(102)
Total	12,836	12,296
Noninterest expense
Salaries and wages	18,506	15,381
Employee benefits	4,206	3,081
Outsourced data processing costs	3,845	3,679
Telephone/data lines	811	612
Occupancy	3,807	3,117
Furniture and equipment	1,757	1,457
Marketing	1,132	1,252
Legal and professional fees	2,847	1,973
FDIC assessments	488	598
Amortization of intangibles	1,458	989
Foreclosed property expense and net (gain)/loss on sale	(40)	192
Other	4,282	4,833
Total	$ 43,099	$ 37,164

Equity Capital - Narrative (Det

Equity Capital - Narrative (Details)	Mar. 31, 2019
Equity [Abstract]
Regulatory threshold for well-capitalized institutions	6.50%

Fair Value - Fair Value of Asse

Fair Value - Fair Value of Assets Measured on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities	$ 877,549	$ 865,831
Loans held for sale	13,900	11,873
Other real estate owned	11,921	12,802
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities	877,549	865,831
Loans held for sale	13,900	11,873
Equity securities	6,283	6,205
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities	100	100
Loans held for sale	0	0
Equity securities	6,283	6,205
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities	877,449	865,731
Loans held for sale	13,900	11,873
Equity securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities	0	0
Loans held for sale	0	0
Equity securities	0	0
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	8,312	8,590
Other real estate owned	11,921	12,802
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Other real estate owned	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	2,102	2,290
Other real estate owned	313	297
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	6,210	6,300
Other real estate owned	$ 11,608	$ 12,505

Fair Value - Aggregate Fair Val

Fair Value - Aggregate Fair Value and Contractual Balance of Loans for Sale (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Aggregate fair value	$ 13,900	$ 11,873
Contractual balance	13,399	11,562
Excess	$ 501	$ 311

Fair Value - Narrative (Details

Fair Value - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Average capitalization rate	7.60%
Specific reserve for impaired loans	$ 32,822	$ 32,423	$ 28,118	$ 27,122
Additions	1,200
Paydowns and chargeoffs	1,300
Additions to level 3 from foreclosed loans	400
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired loans	8,300	8,600
Specific reserve for impaired loans	2,400	$ 2,700
Reductions related to sale of loans	$ 1,300

Fair Value - Carrying Amount an

Fair Value - Carrying Amount and Fair Value of Other Significant Financial Instruments Not Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financial Assets
Debt securities held to maturity	$ 295,485	$ 357,949
Loans, net	4,795,619	4,792,791
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets
Debt securities held to maturity	0	0
Time deposits with other banks	0	0
Loans, net	0	0
Financial Liabilities
Deposit liabilities	0	0
Federal Home Loan Bank (FHLB) borrowings	0	0
Subordinated debt	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Financial Assets
Debt securities held to maturity	291,340	349,895
Time deposits with other banks	0	0
Loans, net	0	0
Financial Liabilities
Deposit liabilities	0	0
Federal Home Loan Bank (FHLB) borrowings	0	0
Subordinated debt	61,039	61,224
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Financial Assets
Debt securities held to maturity	0	0
Time deposits with other banks	8,105	8,132
Loans, net	4,760,789	4,835,248
Financial Liabilities
Deposit liabilities	5,603,019	5,172,098
Federal Home Loan Bank (FHLB) borrowings	3,000	380,027
Subordinated debt	0	0
Carrying Value | Fair Value, Measurements, Recurring
Financial Assets
Debt securities held to maturity	295,485	357,949
Time deposits with other banks	8,174	8,243
Loans, net	4,787,307	4,784,201
Financial Liabilities
Deposit liabilities	5,605,578	5,177,240
Federal Home Loan Bank (FHLB) borrowings	3,000	380,000
Subordinated debt	$ 70,874	$ 70,804

Business Combinations - Narrati

Business Combinations - Narrative (Details) $ in Millions	Oct. 19, 2018USD ($)branch
Business Acquisition [Line Items]
Number of branches operated | branch	7
First Green Bancorp, Inc.
Business Acquisition [Line Items]
Percentage of common stock acquired	100.00%
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)	0.7324
Goodwill recognized from acquisition, nondeductible | $	$ 56.7

Business Combinations - Purchas

Business Combinations - Purchase Price (Details) - First Green Bancorp, Inc. $ / shares in Units, shares in Thousands, $ in Thousands	Oct. 19, 2018USD ($)$ / sharesshares
Business Acquisition [Line Items]
Shares exchanged for cash	$ 5,462
Per share exchange ratio (in shares)	0.7324
Number of shares of common stock issued (in shares) | shares	4,000
Multiplied by common stock price per share (in dollars per share) | $ / shares	$ 26.87
Value of common stock issued	$ 107,486
Cash paid for First Green vested stock options	6,558
Total purchase price	$ 114,044

Business Combinations - Fair Va

Business Combinations - Fair Value of the Assets Purchased, Including Goodwill and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Oct. 19, 2018
Assets:
Goodwill	$ 205,260	$ 204,753
First Green Bancorp, Inc. | Measurement Period Adjustments
Assets:
Cash			$ 0
Investment securities			0
Loans, net			0
Fixed assets			0
Other real estate owned			0
Core deposit intangibles			(678)
Goodwill			506
Other assets			172
Total assets acquired			0
Liabilities:
Deposits			0
Other liabilities			0
Total liabilities assumed			0
First Green Bancorp, Inc. | Initially Measured October 19, 2018
Assets:
Cash			29,434
Investment securities			32,145
Loans, net			631,497
Fixed assets			16,828
Other real estate owned			410
Core deposit intangibles			10,170
Goodwill			56,198
Other assets			40,669
Total assets acquired			817,351
Liabilities:
Deposits			624,289
Other liabilities			79,018
Total liabilities assumed			703,307
First Green Bancorp, Inc. | As Adjusted October 19, 2018
Assets:
Cash			29,434
Investment securities			32,145
Loans, net			631,497
Fixed assets			16,828
Other real estate owned			410
Core deposit intangibles			9,492
Goodwill			56,704
Other assets			40,841
Total assets acquired			817,351
Liabilities:
Deposits			624,289
Other liabilities			79,018
Total liabilities assumed			$ 703,307

Business Combinations - Fair _2

Business Combinations - Fair Value of Acquired Loans (Details) - First Green Bancorp, Inc. $ in Thousands	Oct. 19, 2018USD ($)
Business Acquisition [Line Items]
Book Balance	$ 668,216
Fair Value	631,497
Commercial real estate
Business Acquisition [Line Items]
Book Balance	437,767
Fair Value	406,613
Commercial loans
Business Acquisition [Line Items]
Book Balance	56,288
Fair Value	54,973
Single family residential real estate
Business Acquisition [Line Items]
Book Balance	101,674
Fair Value	101,119
Construction/development/land
Business Acquisition [Line Items]
Book Balance	61,195
Fair Value	58,385
Consumer and other loans
Business Acquisition [Line Items]
Book Balance	9,156
Fair Value	8,942
Purchased Credit Impaired
Business Acquisition [Line Items]
Book Balance	2,136
Fair Value	$ 1,465

Business Combinations - Purch_2

Business Combinations - Purchased Credit Impaired Loans (Details) - First Green Bancorp, Inc. $ in Thousands	Oct. 19, 2018USD ($)
Business Acquisition [Line Items]
Total purchased credit-impaired loan acquired	$ 631,497
Purchased Credit Impaired Loans
Business Acquisition [Line Items]
Contractually required principal and interest	2,136
Non-accretable difference	(671)
Cash flows expected to be collected	1,465
Accretable yield	0
Total purchased credit-impaired loan acquired	$ 1,465

Business Combinations - Pro-For

Business Combinations - Pro-Forma Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)$ / shares
Business Combinations [Abstract]
Net interest income | $	$ 57,416
Net income | $	$ 22,065
EPS - basic (in dollars per share) | $ / shares	$ 0.43
EPS - diluted (in dollars per share) | $ / shares	$ 0.43

Uncategorized Items - sbcf-2019

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