Seacoast Banking Corporation of Florida (SBCF) 10-Q 7 Aug 18 2018 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information	6 Months Ended
	Jun. 30, 2018shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Entity Registrant Name	SEACOAST BANKING CORP OF FLORIDA
Entity Central Index Key	730,708
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	SBCF
Entity Common Stock, Shares Outstanding	47,163,109

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 123,927	$ 104,039
Interest bearing deposits with other banks	7,594	5,465
Total cash and cash equivalents	131,521	109,504
Time deposits with other banks	10,562	12,553
Debt securities:
Available for sale (at fair value)	954,906	949,460
Held to maturity (fair value: $370,787 at June 30, 2018 and $414,470 at December 31, 2017)	382,137	416,863
Total debt securities	1,337,043	1,366,323
Loans held for sale (at fair value)	14,707	24,306
Loans	3,974,016	3,817,377
Less: Allowance for loan losses	(28,924)	(27,122)
Loans, net of allowance for loan losses	3,945,092	3,790,255
Bank premises and equipment, net	63,991	66,883
Other real estate owned	8,417	7,640
Goodwill	148,555	147,578
Other intangible assets, net	17,319	19,099
Bank owned life insurance	121,602	123,981
Net deferred tax assets	26,021	25,417
Other assets	97,851	116,590
TOTAL ASSETS	5,922,681	5,810,129
LIABILITIES
Deposits	4,697,440	4,592,720
Securities sold under agreements to repurchase	200,050	216,094
Federal Home Loan Bank (FHLB) borrowings	205,000	211,000
Subordinated debt	70,664	70,521
Other liabilities	33,364	30,130
TOTAL LIABILITIES	5,206,518	5,120,465
SHAREHOLDERS' EQUITY
Common stock, par value $0.10 per share, authorized 120,000,000 shares, issued 47,297,474 and outstanding 47,163,109 shares at June 30, 2018, and authorized 60,000,000, issued 47,032,259 and outstanding 46,917,735 shares at December 31, 2017	4,716	4,693
Other shareholders' equity	711,447	684,971
TOTAL SHAREHOLDERS' EQUITY	716,163	689,664
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 5,922,681	$ 5,810,129

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Held to maturity, fair value	$ 370,787	$ 414,470
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	120,000,000	60,000,000
Common stock, shares issued (in shares)	47,297,474	47,032,259
Common stock, shares outstanding (in shares)	47,163,109	46,917,735

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Interest and fees on loans	$ 46,519	$ 38,209	$ 91,776	$ 70,100
Interest and dividends on securities	9,605	8,585	19,209	16,959
Interest on interest bearing deposits and other investments	585	604	1,201	1,114
TOTAL INTEREST INCOME	56,709	47,398	112,186	88,173
Interest on deposits	1,988	854	3,526	1,478
Interest on time certificates	2,629	814	4,808	1,380
Interest on borrowed money	1,885	1,574	3,883	2,994
TOTAL INTEREST EXPENSE	6,502	3,242	12,217	5,852
NET INTEREST INCOME	50,207	44,156	99,969	82,321
Provision for loan losses	2,529	1,401	3,614	2,705
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	47,678	42,755	96,355	79,616
Noninterest income
Other income	12,769	10,467	25,167	20,372
Securities (losses)/gains, net	(48)	21	(150)	21
TOTAL NONINTEREST INCOME (Note H)	12,721	10,488	25,017	20,393
TOTAL NONINTEREST EXPENSES (Note H)	38,246	41,625	75,410	76,371
INCOME BEFORE INCOME TAXES	22,153	11,618	45,962	23,638
Provision for income taxes	5,189	3,942	10,971	8,036
NET INCOME	$ 16,964	$ 7,676	$ 34,991	$ 15,602
SHARE DATA
Net income per share - diluted (in dollars per share)	$ 0.35	$ 0.18	$ 0.73	$ 0.38
Net income per share - basic (in dollars per share)	0.36	0.18	0.74	0.38
Cash dividends declared (in dollars per share)	$ 0	$ 0	$ 0	$ 0
Average shares outstanding - diluted (in shares)	47,974,118	43,556,285	47,827,646	41,538,769
Average shares outstanding - basic (in shares)	47,164,909	42,841,152	47,058,958	40,851,273

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 16,964	$ 7,676	$ 34,991	$ 15,602
Other comprehensive income (loss):
Unrealized (losses) gains on securities available for sale	(5,995)	5,601	(17,016)	8,776
Amortization of unrealized losses on securities transferred to held to maturity, net	218	122	334	244
Reclassification adjustment for gains included in net income	0	(21)	0	(21)
Income tax effect on other comprehensive (loss) income	1,543	(2,199)	4,439	(3,467)
Total other comprehensive (loss) income	(4,234)	3,503	(12,243)	5,532
COMPREHENSIVE INCOME	$ 12,730	$ 11,179	$ 22,748	$ 21,134

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 34,991	$ 15,602
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,134	2,677
Amortization of premiums and discounts on securities, net	1,732	1,838
Other amortization and accretion, net	225	(429)
Stock based compensation	3,622	2,540
Origination of loans designated for sale	(159,991)	(117,379)
Sale of loans designated for sale	173,385	113,527
Provision for loan losses	3,614	2,705
Deferred income taxes	4,559	7,338
Gains on sale of securities	0	(21)
Gains on sale of loans	(5,277)	(3,078)
Losses (gains) on sale and write-downs of other real estate owned	298	(212)
Losses on disposition of fixed assets	231	2,316
Changes in operating assets and liabilities, net of effects from acquired companies:
Net decrease in other assets	19,230	1,347
Net increase (decrease) in other liabilities	3,184	(2,634)
Net cash provided by operating activities	82,937	26,137
CASH FLOWS FROM INVESTING ACTIVITIES
Maturities and repayments of debt securities available for sale	77,860	125,115
Maturities and repayments of debt securities held to maturity	34,360	42,883
Proceeds from sale of debt securities available for sale	0	3,820
Purchases of debt securities available for sale	(101,354)	(142,062)
Purchases of debt securities held to maturity	0	(49,963)
Maturities of time deposits with other banks	1,991	847
Net new loans and principal repayments	(161,038)	(198,080)
Proceeds from the sale of other real estate owned	5,184	3,324
Proceeds from sale of FHLB and Federal Reserve Bank Stock	20,570	14,832
Purchase of FHLB and Federal Reserve Stock	(23,055)	(15,012)
Purchase of VISA Class B stock	0	(6,180)
Redemption of bank owned life insurance	4,232	0
Net cash from bank acquisition	0	30,233
Additions to bank premises and equipment	(2,475)	(2,979)
Net cash used in investing activities	(143,725)	(193,222)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	104,720	166,863
Net decrease in federal funds purchased and repurchase agreements	(16,044)	(36,644)
Net decrease in FHLB borrowings	(6,000)	(20,000)
Issuance of common stock, net of related expense	0	55,641
Stock based employee benefit plans	129	(222)
Dividends paid	0	0
Net cash provided by financing activities	82,805	165,638
Net increase (decrease) in cash and cash equivalents	22,017	(1,447)
Cash and cash equivalents at beginning of period	109,504	109,644
Cash and cash equivalents at end of period	131,521	108,197
Supplemental disclosure of non cash investing activities:
Transfers from loans to other real estate owned	4,207	448
Transfers from bank premises to other real estate owned	$ 2,052	$ 1,212

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2018
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 six-month period ended June 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 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, 2017 . Certain prior period amounts have been reclassified to conform to the current period presentation. Adoption of new accounting pronouncements On January 1, 2018, we adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2014-9, “Revenue from Contracts with Customers,” and all the related amendments (collectively, “ASC 606”) using the modified retrospective approach applied to all contracts in place at that date. Adoption had no material impact on the Company’s consolidated financial statements including no change to the amount or timing of revenue recognized for contracts within the scope of the new standard. Activity in the scope of the new standard includes: • Service Charges on Deposits : Seacoast National Bank ("Seacoast Bank") offers a variety of deposit-related services to its customers through several delivery channels including branch offices, ATMs, telephone, mobile, and internet banking. Transaction-based fees are recognized when services, each of which represents a performance obligation, are satisfied. Service fees may be assessed monthly, quarterly, or annually; however, the account agreements to which these fees relate can be cancelled at any time by Seacoast and/or the customer. Therefore, the contract term is considered a single day (a day-to-day contract). • Trust Fees : The Company earns trust fees from fiduciary services provided to trust customers which include custody of assets, recordkeeping, collection and distribution of funds. Fees are earned over time and accrued monthly as the Company provides services, and are generally assessed based on the market value of the trust assets under management at a particular date or over a particular period. • Brokerage Commissions and Fees : The Company earns commissions and fees from investment brokerage services provided to its customers through an arrangement with a third-party service provider. Commissions received from the third-party service provider are recorded monthly and are based upon customer activity. Fees are earned over time and accrued monthly as services are provided. The Company acts as an agent in this arrangement and therefore presents the brokerage commissions and fees net of related costs. • Interchange Income : Fees earned on card transactions depend upon the volume of activity, as well as the fees permitted by the payment network. Such fees are recognized by the Company upon fulfilling its performance obligation to approve the card transaction. On January 1, 2018, we adopted ASU 2016-1, “Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.” Upon adoption, we reclassified $0.1 million of accumulated unrealized loss pertaining to an equity investment previously classified as available for sale from Accumulated Other Comprehensive Income to Retained Earnings. Use of Estimates The preparation of these condensed consolidated financial statements required the use of certain estimates by management in determining the Company’s assets, liabilities, revenues and expenses. Actual results could differ from those estimates. Specific areas, among others, requiring the application of management’s estimates include determination of the allowance for loan losses, the valuation of investment securities available for sale, fair value of impaired loans, contingent liabilities, fair value of other real estate owned, and the valuation of deferred tax assets. Actual results could differ from those estimates.

Recently Issued Accounting Stan

Recently Issued Accounting Standards, Not Yet Adopted	6 Months Ended
	Jun. 30, 2018
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 2016-02, Leases (Topic 842) Description In February 2016, the FASB amended existing guidance that requires lessees recognize the following for all leases at the commencement date: 1. A lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis. 2. A right-of-use specified asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. Certain targeted improvements were made to align lessor accounting with the lessee accounting model and Topic 606, Revenue from Contracts with Customers. In July 2018, the FASB issued ASU 2018-11, which provides an additional optional transition method. The additional transition method allows entities to initially apply the new lease standard at the adoption date by recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Consequently, an entity’s reporting for the comparative periods presented in the financial statements in which the entity adopts the new lease standard would continue to be in accordance with current GAAP (Topic 840), including disclosures. Date of Adoption This amendment is effective for public business entities for reporting periods beginning after December 15, 2018, including interim periods within that reporting period. Early adoption is permitted. Effect on the Consolidated Financial Statements The Company is in the process of evaluating its existing leases, which are primarily operating leases of branch properties and equipment, to determine the amounts to be recognized as right-of-use assets and lease liabilities. The Company will adopt the new standard effective January 1, 2019. The effect of adoption on the Company’s consolidated statements of income is not expected to be material. ASU 2016-13, Financial Instruments –Credit Losses (Topic 326) Description In June 2016, the 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 including 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 evaluating and implementing changes to 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 loan losses upon adoption, recorded as a one-time effect 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. ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased callable Debt Securities Description In March 2017, the FASB issued guidance which requires entities to amortize premiums on certain purchased callable debt securities to their earliest call date. The accounting for purchased callable debt securities held at a discount did not change. Amortizing the premium to the earliest call date generally aligns interest income recognition with the economics of instruments. This guidance requires a modified retrospective approach under which a cumulative adjustment will be made to retained earnings as of the beginning of the period in which it is adopted. Date of Adoption The amendments are effective for public business entities for annual periods beginning after December 15, 2018, including interim periods within those periods. Effect on the Consolidated Financial Statements The impact to the Company's consolidated financial statements from the adoption of this pronouncement is not expected to be material. ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities Description In August 2017, the FASB provided guidance to improve the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. The amendments also simplify the application of the hedge accounting guidance. Date of Adoption The amendments are effective for public business entities for annual periods beginning after December 15, 2018, including interim periods within those periods. Effect on the Consolidated Financial Statements The impact to the Company's consolidated financial statements from the adoption of this pronouncement is not expected to be material.

Earnings per Share

Earnings per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share For the three and six months ended June 30, 2018 , options to purchase 479,000 and 378,000 shares, respectively, were antidilutive and not included in the computation of diluted earnings per share, compared to 269,000 and 149,000 , respectively, for the three and six months ended June 30, 2017 . The dilutive impact of restricted stock and stock options is calculated under the treasury method. Three Months Ended June 30, Six Months Ended (Dollars in thousands, except per share data) 2018 2017 2018 2017 Basic earnings per share Net income $ 16,964 $ 7,676 $ 34,991 $ 15,602 Average common stock outstanding 47,164,909 42,841,152 47,058,958 40,851,273 Net income per share $ 0.36 $ 0.18 $ 0.74 $ 0.38 Diluted earnings per share Net income $ 16,964 $ 7,676 $ 34,991 $ 15,602 Average common stock outstanding 47,164,909 42,841,152 47,058,958 40,851,273 Add: Dilutive effect of employee restricted stock and stock options 809,209 715,133 768,688 687,496 Average diluted stock outstanding 47,974,118 43,556,285 47,827,646 41,538,769 Net income per share $ 0.35 $ 0.18 $ 0.73 $ 0.38 On February 21, 2017 , the Company completed a public offering of 2,702,500 shares of common stock, generating net proceeds to the Company of $55.7 million . In addition, CapGen Capital Group III LP (“CapGen”), in conjunction with the Company’s offering, sold 6,210,000 shares of the Company’s common stock, with no net proceeds to the Company.

Securities

Securities	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The gross amortized cost, gross unrealized gains and losses and gross fair value of securities available for sale and held to maturity at June 30, 2018 and December 31, 2017 (1) are summarized as follows: June 30, 2018 Gross Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (In thousands) Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Entities $ 8,372 $ 137 $ (44 ) $ 8,465 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 616,152 239 (21,510 ) 594,881 Private mortgage-backed securities and collateralized mortgage obligations 80,618 918 (404 ) 81,132 Collateralized loan obligations 226,549 98 (504 ) 226,143 Obligations of state and political subdivisions 44,491 339 (545 ) 44,285 Totals $ 976,182 $ 1,731 $ (23,007 ) $ 954,906 Debt securities held to maturity Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities $ 324,410 $ 0 $ (11,551 ) $ 312,859 Private mortgage-backed securities and collateralized mortgage obligations 22,127 241 (96 ) 22,272 Collateralized loan obligations 35,600 57 (1 ) 35,656 Totals $ 382,137 $ 298 $ (11,648 ) $ 370,787 December 31, 2017 Gross Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (In thousands) Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Entities $ 9,475 $ 274 $ (5 ) $ 9,744 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 560,396 1,163 (8,034 ) 553,525 Private mortgage-backed securities and collateralized mortgage obligations 75,152 1,154 (285 ) 76,021 Collateralized loan obligations 263,579 798 (68 ) 264,309 Obligations of state and political subdivisions 45,118 813 (70 ) 45,861 Totals $ 953,720 $ 4,202 $ (8,462 ) $ 949,460 Debt securities held to maturity Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities $ 353,541 $ 802 $ (4,159 ) $ 350,184 Private mortgage-backed securities and collateralized mortgage obligations 22,799 714 (53 ) 23,460 Collateralized loan obligations 40,523 303 0 40,826 Totals $ 416,863 $ 1,819 $ (4,212 ) $ 414,470 (1) December 31, 2017 balances in the tables above reflect certain reclassifications between categories. There were no sales of securities during the three and six month periods ended June 30, 2018 . Proceeds from sales of securities during the three and six month periods ended June 30, 2017 were $3.8 million with gross gains of $21,000 and no gross losses. Included in “Securities (losses)/gains, net” for the three and six month periods ended June 30, 2018 , is $0.1 million and $0.2 million , respectively, decline in the value of an investment in shares of a mutual fund that invests primarily in CRA-qualified debt securities. At June 30, 2018 , debt securities with a fair value of $172.7 million were pledged as collateral for United States Treasury deposits, other public deposits and trust deposits, and debt securities with a fair value of $200.1 million were pledged as collateral for repurchase agreements. The amortized cost and fair value of debt securities available for sale and held to maturity at June 30, 2018 , 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 Amortized Cost Fair Value Amortized Cost Fair Value (In thousands) Due in less than one year $ 0 $ 0 $ 15,119 $ 15,110 Due after one year through five years 3,600 3,599 64,674 64,761 Due after five years through ten years 29,000 29,053 183,806 183,290 Due after ten years 3,000 3,004 15,813 15,732 35,600 35,656 279,412 278,893 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 324,410 312,859 616,152 594,881 Private mortgage-backed securities and collateralized mortgage obligations 22,127 22,272 80,618 81,132 Totals $ 382,137 $ 370,787 $ 976,182 $ 954,906 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 amount of debt securities with unrealized losses and the period of time for which these losses were outstanding at June 30, 2018 and December 31, 2017 , respectively. June 30, 2018 Less than 12 months 12 months or longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (In thousands) U.S. Treasury securities and obligations of U.S. Government Entities $ 3,417 $ (44 ) $ 0 $ 0 $ 3,417 $ (44 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 420,280 (12,087 ) 468,753 (20,976 ) 889,033 (33,063 ) Private mortgage-backed securities and collateralized mortgage obligations 25,971 (210 ) 18,468 (291 ) 44,439 (501 ) Collateralized loan obligations 138,769 (502 ) 0 0 138,769 (502 ) Obligations of state and political subdivisions 9,896 (94 ) 20,330 (451 ) 30,226 (545 ) Totals $ 598,333 $ (12,937 ) $ 507,551 $ (21,718 ) $ 1,105,884 $ (34,655 ) December 31, 2017 Less than 12 months 12 months or longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (In thousands) U.S. Treasury securities and obligations of U.S. Government Entities $ 1,107 $ (5 ) $ 0 $ 0 $ 1,107 $ (5 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 304,723 (2,047 ) 413,725 (10,146 ) 718,448 (12,193 ) Private mortgage-backed securities and collateralized mortgage obligations 0 0 20,744 (338 ) 20,744 (338 ) Collateralized loan obligations 14,933 (68 ) 0 0 14,933 (68 ) Obligations of state and political subdivisions 5,414 (14 ) 5,864 (56 ) 11,278 (70 ) Totals $ 326,177 $ (2,134 ) $ 440,333 $ (10,540 ) $ 766,510 $ (12,674 ) 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 June 30, 2018 , the unamortized balance was $0.9 million . The fair value of those securities in an unrealized loss position for less than twelve months at June 30, 2018 and December 31, 2017 was $57.7 million and $22.9 million , respectively, with unrealized losses of $1.2 million and $0.2 million , respectively. The fair value of those securities in an unrealized loss position for 12 months or more at June 30, 2018 and December 31, 2017 is $13.1 million and $15.3 million , respectively, with unrealized losses of $0.7 million and $0.4 million , respectively. At June 30, 2018 , the Company had $33.1 million of unrealized losses on mortgage-backed securities and collateralized mortgage obligations of government sponsored entities having a fair value of $889 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 debt securities are guaranteed by U.S. government-sponsored entities. Based on our assessment of these mitigating factors, management believes that the unrealized losses on these 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 June 30, 2018 , $0.5 million of the unrealized losses pertained to private label debt securities secured by seasoned collateral with a fair value of $44.4 million . Management attributes the loss to a combination of factors, including relative changes in interest rates since the time of purchase. The collateral underlying these mortgage investments are 30 - and 15 -year fixed and 10/1 adjustable rate mortgage loans with low loan to values, improving subordination, and historically have had minimal foreclosures and losses. Based on its assessment of these factors, management believes that the unrealized losses on these holdings are a function of changes in investment spreads and interest rate movements and not changes in credit quality. Management expects to recover the entire amortized cost basis of these securities. At June 30, 2018 , collateralized loan obligations with a fair value of $138.7 million had unrealized losses of $0.5 million . Management expects to recover the entire amortized cost basis of these securities. At June 30, 2018 , obligations of state and political subdivisions with a fair value of $30.2 million had unrealized losses of $0.5 million . Management expects to recover the entire amortized cost basis of these securities. As of June 30, 2018 , the Company does not intend to sell debt securities that are in an unrealized loss position and it is not more 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 June 30, 2018 . Included in other assets is Federal Home Loan Bank and Federal Reserve Bank stock which has a par value of $35 million and $32.5 million as of June 30, 2018 and December 31, 2017 , respectively. At June 30, 2018 , the Company had not identified events or changes in circumstances which may have a significant adverse effect on the fair value of these investments. Also included in other assets is a $6.2 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 pending litigation, will be converted to Visa Class A shares. Under the current conversion ratio that became effective June 28, 2018, the Company expects to receive 1.6298 shares of Class A stock for each share of Class B stock, for a total of 18,465 shares of Visa Class A stock. Our ownership of these shares is related to prior ownership in Visa’s network while Visa operated as a cooperative. The shares are recorded on our financial records at zero basis.

Loans

Loans	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Loans	Loans Information pertaining to portfolio loans, purchased credit impaired (“PCI”) loans, and purchased unimpaired loans (“PUL”) is as follows: June 30, 2018 Portfolio Loans PCI Loans PULs Total (In thousands) Construction and land development $ 250,314 $ 126 $ 108,630 $ 359,070 Commercial real estate 1,297,051 10,878 393,366 1,701,295 Residential real estate 941,728 1,417 160,800 1,103,945 Commercial and financial 548,758 794 69,318 618,870 Consumer 183,718 0 7,118 190,836 Totals 1 $ 3,221,569 $ 13,215 $ 739,232 $ 3,974,016 December 31, 2017 Portfolio Loans PCI Loans PULs Total (In thousands) Construction and land development $ 215,315 $ 1,121 $ 126,689 $ 343,125 Commercial real estate 1,170,618 9,776 459,598 1,639,992 Residential real estate 845,420 5,626 187,764 1,038,810 Commercial and financial 512,430 894 92,690 606,014 Consumer 178,826 0 10,610 189,436 Totals 1 $ 2,922,609 $ 17,417 $ 877,351 $ 3,817,377 (1) Net loan balances as of June 30, 2018 and December 31, 2017 include deferred costs of $15.0 million and $12.9 million for each period, respectively. The following tables present the contractual delinquency of the recorded investment by class of loans as of: June 30, 2018 Current Accruing 30-59 Days Past Due Accruing 60-89 Days Past Due Accruing Greater Than 90 Days Nonaccrual Total Financing Receivables (In thousands) Portfolio Loans Construction and land development $ 250,053 $ 44 $ 0 $ 0 $ 217 $ 250,314 Commercial real estate 1,286,765 788 0 0 9,498 1,297,051 Residential real estate 930,666 2,296 0 0 8,766 941,728 Commerical and financial 543,301 4,544 0 0 913 548,758 Consumer 183,410 144 0 0 164 183,718 Totals 3,194,195 7,816 0 0 19,558 3,221,569 Purchased Unimpaired Loans Construction and land development 108,017 613 0 0 0 108,630 Commercial real estate 390,619 2,339 0 0 408 393,366 Residential real estate 155,520 1,274 109 0 3,897 160,800 Commerical and financial 67,366 1,459 0 493 0 69,318 Consumer 7,098 20 0 0 0 7,118 Totals 728,620 5,705 109 493 4,305 739,232 Purchased Credit Impaired Loans Construction and land development 126 0 0 0 0 126 Commercial real estate 9,451 0 0 0 1,427 10,878 Residential real estate 570 0 0 0 847 1,417 Commerical and financial 749 0 0 0 45 794 Consumer 0 0 0 0 0 0 Totals 10,896 0 0 0 2,319 13,215 Totals $ 3,933,711 $ 13,521 $ 109 $ 493 $ 26,182 $ 3,974,016 December 31, 2017 Current Accruing 30-59 Days Past Due Accruing 60-89 Days Past Due Accruing Greater Than 90 Days Nonaccrual Total Financing Receivables (In thousands) Portfolio Loans Construction and land development $ 215,077 $ 0 $ 0 $ 0 $ 238 $ 215,315 Commercial real estate 1,165,738 2,605 585 0 1,690 1,170,618 Residential real estate 836,117 812 75 0 8,416 845,420 Commercial and financial 507,501 2,776 26 0 2,127 512,430 Consumer 178,676 52 0 0 98 178,826 Totals 2,903,109 6,245 686 0 12,569 2,922,609 Purchased Unimpaired Loans Construction and land development 126,655 34 0 0 0 126,689 Commercial real estate 457,899 979 0 0 720 459,598 Residential real estate 186,549 128 87 0 1,000 187,764 Commercial and financial 92,315 54 0 0 321 92,690 Consumer 10,610 0 0 0 0 10,610 Totals 874,028 1,195 87 0 2,041 877,351 Purchased Credit Impaired Loans Construction and land development 1,121 0 0 0 0 1,121 Commercial real estate 9,352 0 0 0 424 9,776 Residential real estate 544 642 0 0 4,440 5,626 Commercial and financial 844 0 0 0 50 894 Consumer 0 0 0 0 0 0 Totals 11,861 642 0 0 4,914 17,417 Totals $ 3,788,998 $ 8,082 $ 773 $ 0 $ 19,524 $ 3,817,377 The Company utilizes an internal asset classification system as a means of reporting problem and potential problem loans. Under the Company’s risk rating system, the Company classifies problem and potential problem loans as “Special Mention,” “Substandard,” and “Doubtful” and these loans are monitored on an ongoing basis. 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 include those characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as Substandard may require a specific allowance. Loans classified as Doubtful have all the weaknesses inherent in those classified Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The principal on loans classified as Doubtful is generally charged off. Risk ratings are updated any time the situation warrants. Loans that are not problem or potential problem loans are considered to be pass-rated loans and risk grades are recalculated at least annually by the loan relationship manager. The following tables present the risk category of loans by class of loans based on the most recent analysis performed as of June 30, 2018 and December 31, 2017 : June 30, 2018 Pass Special Mention Substandard Doubtful Total (In thousands) Construction and land development $ 351,792 $ 6,456 $ 822 $ 0 $ 359,070 Commercial real estate 1,647,630 19,716 33,949 0 1,701,295 Residential real estate 1,077,202 2,341 24,402 0 1,103,945 Commercial and financial 612,333 214 6,223 100 618,870 Consumer 188,894 1,338 604 0 190,836 Totals $ 3,877,851 $ 30,065 $ 66,000 $ 100 $ 3,974,016 December 31, 2017 Pass Special Mention Substandard Doubtful Total (In thousands) Construction and land development $ 328,127 $ 10,414 $ 4,584 $ 0 $ 343,125 Commercial real estate 1,586,932 29,273 23,787 0 1,639,992 Residential real estate 1,023,925 4,621 10,203 61 1,038,810 Commercial and financial 593,689 3,237 8,838 250 606,014 Consumer 189,354 0 82 0 189,436 Totals $ 3,722,027 $ 47,545 $ 47,494 $ 311 $ 3,817,377 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 June 30, Six Months Ended June 30, (In thousands) 2018 2017 2018 2017 Beginning balance $ 3,552 $ 3,510 $ 3,699 $ 3,807 Additions 0 0 0 0 Deletions 0 (10 ) (43 ) (10 ) Accretion (262 ) (451 ) (705 ) (816 ) Reclassification from non-accretable difference (101 ) 216 238 284 Ending balance $ 3,189 $ 3,265 $ 3,189 $ 3,265 Troubled Debt Restructured Loans The Company’s Troubled Debt Restructuring (“TDR”) concessions granted generally do not include forgiveness of principal balances, but may include interest rate reductions, an extension of the amortization period and/or converting the loan to interest only for a limited period of time. Loan modifications are not reported in calendar years after modification if the loans were modified at an interest rate equal to the yields of new loan originations with comparable risk and the loans are performing based on the terms of the restructuring agreements. Most loans prior to modification were classified as impaired and the allowance for loan losses is determined in accordance with Company policy. The following table presents loans that were modified during the six months ended: Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Specific Reserve Recorded Valuation Allowance Recorded (In thousands) June 30, 2018 Commercial and financial 1 $ 98 $ 0 $ 0 $ 0 Totals 1 $ 98 $ 0 $ 0 $ 0 June 30, 2017 Construction and land development 1 $ 52 $ 46 $ 6 $ 6 Residential real estate 1 15 15 0 0 Totals 2 $ 67 $ 61 $ 6 $ 6 During the three and six months ended June 30, 2018 , there was one payment default on a loan of $0.1 million that had been modified to a TDR within the previous twelve months, compared to none during the three and six months ended June 30, 2017. 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 specific a 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 June 30, 2018 and December 31, 2017 , the Company’s recorded investment in impaired loans, excluding PCI loans, the unpaid principal balance and related valuation allowance was as follows: June 30, 2018 Recorded Investment Unpaid Principal Balance Related Valuation Allowance (In thousands) Impaired Loans with No Related Allowance Recorded: Construction and land development $ 204 $ 484 $ 0 Commercial real estate 2,549 3,764 0 Residential real estate 13,847 18,352 0 Commercial and financial 0 0 0 Consumer 172 211 0 Impaired Loans with an Allowance Recorded: Construction and land development 224 238 24 Commercial real estate 13,116 13,144 525 Residential real estate 6,820 7,014 933 Commercial and financial 933 927 550 Consumer 267 273 41 Total Impaired Loans Construction and land development 428 722 24 Commercial real estate 15,665 16,908 525 Residential real estate 20,667 25,366 933 Commercial and financial 933 927 550 Consumer 439 484 41 Totals $ 38,132 $ 44,407 $ 2,073 December 31, 2017 Recorded Investment Unpaid Principal Balance Related Valuation Allowance (In thousands) Impaired Loans with No Related Allowance Recorded: Construction and land development $ 223 $ 510 $ 0 Commercial real estate 3,475 4,873 0 Residential real estate 10,272 15,063 0 Commercial and financial 19 29 0 Consumer 105 180 0 Impaired Loans with an Allowance Recorded: Construction and land development 251 264 23 Commercial real estate 4,780 4,780 195 Residential real estate 8,448 8,651 1,091 Commercial and financial 2,436 883 1,050 Consumer 282 286 43 Total Impaired Loans Construction and land development 474 774 23 Commercial real estate 8,255 9,653 195 Residential real estate 18,720 23,714 1,091 Commercial and financial 2,455 912 1,050 Consumer 387 466 43 Totals $ 30,291 $ 35,519 $ 2,402 Impaired loans also include TDRs where concessions have been granted to borrowers who have experienced financial difficulty. At June 30, 2018 and at December 31, 2017 , accruing TDRs totaled $14.2 million and $15.6 million , respectively. Average impaired loans for the three months ended June 30, 2018 and 2017 were $34.4 million and $32.8 million , respectively. Average impaired loans for the six months ended June 30, 2018 and 2017 were $32.2 million and $31.7 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 June 30, 2018 and 2017, the Company recorded interest income on impaired loans of $0.6 million and $0.4 million, respectively. For the six months ended June 30, 2018 , and 2017 , the Company recorded interest income on impaired loans of $0.9 million and $0.7 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 $33,000 and $64,000 , respectively, for the three months ended June 30, 2018 and 2017 and $121,000 and $113,000 , respectively, for the six months ended June 30, 2018 and 2017 .

Allowance for Loan Losses

Allowance for Loan Losses	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Allowance for Loan Losses	Allowance for Loan Losses Activity in the allowance for loan losses for the three month and six month periods ended June 30, 2018 and 2017 is summarized as follows: Three Months Ended June 30, 2018 Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance (In thousands) Construction & land development $ 2,058 $ 224 $ 0 $ 5 $ 0 $ 2,287 Commercial real estate 8,842 210 (14 ) 103 (15 ) 9,126 Residential real estate 8,047 414 (27 ) 433 (17 ) 8,850 Commercial and financial 7,393 1,630 (1,945 ) 24 0 7,102 Consumer 1,778 51 (328 ) 59 (1 ) 1,559 Totals $ 28,118 $ 2,529 $ (2,314 ) $ 624 $ (33 ) $ 28,924 Three Months Ended June 30, 2017 Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance (In thousands) Construction & land development $ 1,352 $ 128 $ 0 $ 94 $ 0 $ 1,574 Commercial real estate 9,861 (167 ) (82 ) 331 (20 ) 9,923 Residential real estate 7,064 324 (21 ) 99 (43 ) 7,423 Commercial and financial 4,635 1,193 (447 ) 79 0 5,460 Consumer 1,650 (77 ) (54 ) 102 (1 ) 1,620 Totals $ 24,562 $ 1,401 $ (604 ) $ 705 $ (64 ) $ 26,000 Six Months Ended June 30, 2018 Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance (In thousands) Construction & land development $ 1,642 $ 635 $ 0 $ 10 $ 0 $ 2,287 Commercial real estate 9,285 (365 ) (14 ) 250 (30 ) 9,126 Residential real estate 7,131 1,201 (27 ) 634 (89 ) 8,850 Commercial and financial 7,297 1,900 (2,143 ) 48 0 7,102 Consumer 1,767 243 (635 ) 186 (2 ) 1,559 Totals $ 27,122 $ 3,614 $ (2,819 ) $ 1,128 $ (121 ) $ 28,924 Six Months Ended June 30, 2017 Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance (In thousands) Construction & land development $ 1,219 $ 192 $ 0 $ 165 $ (2 ) $ 1,574 Commercial real estate 9,273 313 (68 ) 439 (34 ) 9,923 Residential real estate 7,483 (100 ) (112 ) 227 (75 ) 7,423 Commercial and financial 3,636 2,314 (616 ) 126 0 5,460 Consumer 1,789 (14 ) (312 ) 159 (2 ) 1,620 Totals $ 23,400 $ 2,705 $ (1,108 ) $ 1,116 $ (113 ) $ 26,000 The allowance for loan losses is composed 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 June 30, 2018 and December 31, 2017 is shown in the following tables: June 30, 2018 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance (In thousands) Construction & land development $ 428 $ 24 $ 358,516 $ 2,263 $ 358,944 $ 2,287 Commercial real estate 15,665 525 1,674,752 8,601 1,690,417 9,126 Residential real estate 20,668 933 1,081,860 7,917 1,102,528 8,850 Commercial and financial 933 550 617,143 6,552 618,076 7,102 Consumer 438 41 190,398 1,518 190,836 1,559 Totals $ 38,132 $ 2,073 $ 3,922,669 $ 26,851 $ 3,960,801 $ 28,924 December 31, 2017 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance (In thousands) Construction & land development $ 474 $ 23 $ 341,530 $ 1,619 $ 342,004 $ 1,642 Commercial real estate 8,255 195 1,621,960 9,090 1,630,215 9,285 Residential real estate 18,720 1,091 1,014,465 6,040 1,033,185 7,131 Commercial and financial 2,455 1,050 602,666 6,247 605,121 7,297 Consumer 387 43 189,049 1,724 189,436 1,767 Totals $ 30,291 $ 2,402 $ 3,769,670 $ 24,720 $ 3,799,961 $ 27,122 Loans collectively evaluated for impairment reported at June 30, 2018 included acquired loans that are not PCI loans. At June 30, 2018 , the remaining fair value adjustments for loans acquired was approximately $15.5 million, or approximately 2.1% of the outstanding aggregate PUL balances. At December 31, 2017 , the remaining fair value adjustments for loans acquired was approximately $19.4 million, or 2.2% of the outstanding aggregate PUL balances. These amounts represent the fair value discount of each PUL and 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 June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 PCI Loans Individually Evaluated for Impairment Recorded Investment Associated Allowance Recorded Investment Associated Allowance (in thousands) Construction & land development $ 126 $ 0 $ 1,121 $ 0 Commercial real estate 10,878 0 9,776 0 Residential real estate 1,417 0 5,626 0 Commercial and financial 794 0 894 0 Consumer 0 0 0 0 Totals $ 13,215 $ 0 $ 17,417 $ 0

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	6 Months Ended
	Jun. 30, 2018
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: June 30, 2018 December 31, 2017 (In thousands) Fair-Value of Pledged Securities - overnight and continuous Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities $ 200,050 $ 216,094

Noninterest Income and Expense

Noninterest Income and Expense	6 Months Ended
	Jun. 30, 2018
Brokers and Dealers [Abstract]
Noninterest Income and Expense	Noninterest Income and Expense Detail of noninterest income and expenses for the three and six months ended June 30, 2018 and 2017 are as follows: Three Months Ended Six Months Ended June 30, June 30, 2018 2017 2018 2017 (In thousands) Noninterest income Service charges on deposit accounts $ 2,674 $ 2,435 $ 5,346 $ 4,857 Trust fees 1,039 917 2,060 1,797 Mortgage banking fees 1,336 1,272 2,738 2,824 Brokerage commissions and fees 461 351 820 728 Marine finance fees 446 326 1,019 460 Interchange income 3,076 2,785 6,018 5,419 BOLI income 1,066 757 2,122 1,490 Other income 2,671 1,624 5,044 2,797 12,769 10,467 25,167 20,372 Securities (losses)/gains, net (48 ) 21 (150 ) 21 Totals $ 12,721 $ 10,488 $ 25,017 $ 20,393 Noninterest expense Salaries and wages $ 16,429 $ 18,375 $ 31,810 $ 33,744 Employee benefits 3,034 2,935 6,115 6,003 Outsourced data processing costs 3,393 3,456 7,072 6,725 Telephone/data lines 643 648 1,255 1,180 Occupancy 3,316 4,421 6,433 7,578 Furniture and equipment 1,468 1,679 2,925 3,070 Marketing 1,344 1,074 2,596 1,996 Legal and professional fees 2,301 3,276 4,274 5,408 FDIC assessments 595 650 1,193 1,220 Amortization of intangibles 1,004 839 1,993 1,558 Net losses and disposition expense on other real estate owned 405 297 597 4 Other 4,314 3,975 9,147 7,885 Total $ 38,246 $ 41,625 $ 75,410 $ 76,371

Equity Capital

Equity Capital	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Equity Capital	Equity Capital The Company is well capitalized and at June 30, 2018 , 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.

Contingencies

Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies The Company and its subsidiaries, because of the nature of their businesses, are at all times subject to 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 material adverse effect on the Company’s consolidated financial condition, operating results or cash flows, although no assurance can be given with respect to the ultimate outcome of any such claim or litigation.

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Under ASC 820, fair value measurements for items measured at fair value on a recurring and nonrecurring basis at June 30, 2018 and December 31, 2017 included: Fair Value Measurements Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) June 30, 2018 Available for sale debt securities (1) $ 954,906 $ 100 $ 954,806 $ 0 Loans held for sale (2) 14,707 0 14,707 0 Loans (3) 11,525 0 2,822 8,703 Other real estate owned (4) 8,417 0 3,766 4,651 Equity securities (5) 6,193 6,193 0 0 December 31, 2017 Available for sale debt securities (1)(5) $ 949,460 $ 100 $ 949,360 $ 0 Loans held for sale (2) 24,306 0 24,306 0 Loans (3) 4,192 0 3,454 738 Other real estate owned (4) 7,640 0 60 7,580 Equity securities (5) 6,344 6,344 0 0 (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 F. 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 310. (4) Fair value is measured on a nonrecurring basis in accordance with ASC 360. (5) Prior to adoption of ASU 2016-1 on January 1, 2018, an investment in shares of a mutual fund that invests primarily in CRA-qualified debt securities was classified as an available for sale security. Beginning in 2018, this security is reported at fair value in Other Assets. Fair value is determined based on market quotations. Loans held for sale : Fair values are based upon estimated values 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 June 30, 2018 and December 31, 2017 . The aggregate fair value and contractual balance of loans held for sale as of June 30, 2018 and December 31, 2017 is as follows: (In thousands) June 30, 2018 December 31, 2017 Aggregate fair value $ 14,707 $ 24,306 Contractual balance 14,296 23,627 Excess 411 679 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 June 30, 2018 , the range of 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 $11.5 million with a specific reserve of $2.1 million at June 30, 2018 , compared to $4.2 million with a specific reserve of $2.4 million at December 31, 2017 . 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. 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 during the six months ended June 30, 2018 and 2017 . For loans classified as level 3, the changes included additions of $8.1 million related to loans that became impaired during 2018, offset by paydowns and chargeoffs of $0.2 million for the six months ended June 30, 2018 . For OREO classified as level 3 during the six months ended June 30, 2018 , changes included the addition of foreclosed loans of $0.3 million and migrated branches taken out of service of $2.0 million offset by reductions primarily consisting of sales of $5.3 million . The carrying amount and fair value of the Company’s other financial instruments that are not measured at fair value on a recurring basis in the balance sheet as of June 30, 2018 and December 31, 2017 is as follows: Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) June 30, 2018 Financial Assets Debt securities held to maturity (1) $ 382,137 $ 0 $ 370,787 $ 0 Time deposits with other banks 10,562 0 0 10,427 Loans, net 3,933,567 0 0 3,916,436 Financial Liabilities Deposit liabilities 4,697,440 0 0 4,692,308 Federal Home Loan Bank (FHLB) borrowings 205,000 0 0 204,980 Subordinated debt 70,664 0 61,654 0 December 31, 2017 Financial Assets Debt securities held to maturity (1) $ 416,863 $ 0 $ 414,470 $ 0 Time deposits with other banks 12,553 0 0 12,493 Loans, net 3,786,063 0 0 3,760,754 Financial Liabilities Deposit liabilities 4,592,720 0 0 4,588,515 Federal Home Loan Bank (FHLB) borrowings 211,000 0 0 211,000 Subordinated debt 70,521 0 61,530 0 (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, federal funds purchased, and debt 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 June 30, 2018 and December 31, 2017 : Debt securities : U.S. Treasury debt securities are reported at fair value utilizing Level 1 inputs. Other 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. Prior to adoption of ASU 2016-1 on January 1, 2018, the estimated fair value of the loan portfolio utilized an “entrance price” approach. Beginning in 2018, 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	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Business Combinations	Business Combinations Acquisition of GulfShore Bancshares, Inc. On April 7, 2017, the Company completed its acquisition of GulfShore Bancshares, Inc. ("Gulfshore"), the parent company of GulfShore Bank. Simultaneously, upon completion of the merger, GulfShore’s wholly owned subsidiary bank, GulfShore Bank, was merged with and into Seacoast Bank. GulfShore, headquartered in Tampa, Florida, operated 3 branches in Tampa and St. Petersburg, all of which have been retained as Seacoast locations. This acquisition added $358 million in total assets, $251 million in loans and $285 million in deposits to Seacoast. As a result of this acquisition, the Company expects to enhance its presence in the Tampa, Florida market, 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 GulfShore. Under the terms of the definitive agreement, GulfShore shareholders received, for each share of GulfShore common stock, the combination of $1.47 in cash and 0.4807 shares of Seacoast common stock (based on Seacoast’s closing price of $23.94 per share on April 7, 2017). (In thousands, except per share data) April 7, 2017 Shares exchanged for cash $ 8,034 Number of GulfShore Bancshares, Inc. common shares outstanding 5,464 Per share exchange ratio 0.4807 Number of shares of common stock issued 2,627 Multiplied by common stock price per share on April 7, 2017 23.94 Value of common stock issued $ 62,883 Total purchase price $ 70,917 The acquisition was accounted for under the acquisition method in accordance with ASC Topic 805, Business Combinations . The Company recognized goodwill of $37.1 million for this acquisition that is nondeductible for tax purposes. Determining fair values of assets and liabilities, especially the loan portfolio, core deposit intangibles, and deferred taxes, is a complicated process involving significant judgment regarding methods and assumptions used to calculate estimated fair values. Initially Reported April 7, 2017 Measurement Period Adjustments As Adjusted April 7, 2017 (In thousands) Assets: Cash $ 55,540 $ 0 $ 55,540 Investment securities 316 0 316 Loans, net 250,876 0 250,876 Fixed assets 1,307 0 1,307 Other real estate owned 13 0 13 Core deposit intangibles 3,927 0 3,927 Goodwill 37,098 0 37,098 Other assets 8,572 0 8,572 Totals $ 357,649 0 $ 357,649 Liabilities: Deposits $ 285,350 $ 0 $ 285,350 Other liabilities 1,382 0 1,382 Totals $ 286,732 0 $ 286,732 The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. April 7, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 101,281 $ 99,598 Commercial real estate 106,729 103,905 Construction/development/land 13,175 11,653 Commercial loans 32,137 32,247 Consumer and other loans 3,554 3,473 Purchased credit-impaired 0 0 Total acquired loans $ 256,876 $ 250,876 No loans acquired were specifically identified with credit deficiency factors, pursuant to ASC Topic 310-30. The factors we considered to identify loans as PCI loans were all acquired loans that were nonaccrual, 60 days or more past due, designated as TDR, graded “special mention” or “substandard.” Loans without specifically identified credit deficiency factors are referred to as PULs for disclosure purposes. These loans were then evaluated to determine estimated fair values as of the acquisition date. Although no specific credit deficiencies were identifiable, we believe there is an element of risk as to whether all contractual cash flows will be eventually received. Factors that were considered included the economic environment both nationally and locally as well as the real estate market particularly in Florida. We have applied ASC Topic 310-20 accounting treatment to the PULs. The Company believes the deposits assumed from the acquisition have an intangible value. In determining the valuation amount, deposits were analyzed based on factors such as type of deposit, deposit retention, interest rates and age of deposit relationships. Acquisition of NorthStar Banking Corporation On October 20, 2017, the Company completed its acquisition of NorthStar Banking Corporation (“NSBC”). Simultaneously, upon completion of the merger of NSBC with and into the Company, NSBC’s wholly owned subsidiary bank, NorthStar Bank (“NorthStar”), was merged with and into Seacoast Bank. NorthStar, headquartered in Tampa, Florida, operated three branches in Tampa, of which all have been retained as Seacoast locations. This acquisition added $216 million in total assets, $137 million in loans and $182 million in deposits to Seacoast. As a result of this acquisition, the Company expects to enhance its presence in the Tampa, Florida market, 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 NSBC. Under the terms of the definitive agreement, NSBC shareholders received, for each share of NSBC common stock, the combination of $2.40 in cash and 0.5605 shares of Seacoast common stock (based on Seacoast’s closing price of $24.92 per share on October 20, 2017). (In thousands, except per share data) October 20, 2017 Shares exchanged for cash $ 4,701 Number of NorthStar Banking Corporation Common shares outstanding 1,958 Per share exchange ratio 0.5605 Number of shares of common stock issued 1,098 Multiplied by common stock price per share on October 20, 2017 $ 24.92 Value of common stock issued 27,353 Cash paid for NorthStar Banking Corporation vested stock options 801 Total purchase price $ 32,855 The acquisition was accounted for under the acquisition method in accordance with ASC Topic 805, Business Combinations . The Company recognized goodwill of $12.3 million for this acquisition that is nondeductible for tax purposes. 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. Initially Reported October 20 2017 Measurement Period Adjustments As Adjusted October 20, 2017 (In thousands) Assets: Cash $ 5,485 $ 0 $ 5,485 Investment securities 56,123 0 56,123 Loans, net 136,832 0 136,832 Fixed assets 2,637 0 2,637 Core deposit intangibles 1,275 0 1,275 Goodwill 12,404 (99 ) 12,305 Other assets 1,522 99 1,621 Totals $ 216,278 $ 0 $ 216,278 Liabilities: Deposits $ 182,443 $ 0 $ 182,443 Other liabilities 980 0 980 Totals $ 183,423 $ 0 $ 183,423 The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. October 20, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 15,111 $ 15,096 Commercial real estate 73,139 69,554 Construction/development/land 11,706 10,390 Commercial loans 31,200 30,854 Consumer and other loans 6,761 6,645 Purchased Credit Impaired 5,527 4,293 Total acquired loans $ 143,444 $ 136,832 For the loans acquired we first segregated all acquired loans with specifically identified credit deficiency 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 20, 2017 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. (In thousands) October 20, 2017 Contractually required principal and interest $ 5,596 Non-accretable difference (689 ) Cash flows expected to be collected 4,907 Accretable yield (614 ) Total purchased credit-impaired loan acquired $ 4,293 Loans without specifically identified credit deficiency factors are referred to as PULs for disclosure purposes. These loans were then evaluated to determine estimated fair values as of the acquisition date. Although no specific credit deficiencies were identifiable, we believe there is an element of risk as to whether all contractual cash flows will be eventually received. Factors that were considered included the economic environment both nationally and locally as well as the real estate market particularly in Florida. We have applied ASC Topic 310-20 accounting treatment to the PULs. The Company believes the deposits assumed from the acquisition have an intangible value. In determining the valuation amount, deposits were analyzed based on factors such as type of deposit, deposit retention, interest rates and age of deposit relationships. Acquisition of Palm Beach Community Bank On November 3, 2017, the Company completed its acquisition of Palm Beach Community Bank (“PBCB”). PBCB was merged with and into Seacoast Bank. This acquisition added $357 million in total assets, $270 million in loans and $269 million in deposits to Seacoast. PBCB, headquartered in West Palm Beach, Florida, operated four branches in West Palm Beach, two of which were consolidated with Seacoast locations in February 2018. As a result of this acquisition, the Company expects to enhance its presence in the Palm Beach, Florida market, 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 PBCB. Under the terms of the definitive agreement, PBCB shareholders received, for each share of PBCB common stock, the combination of $6.26 in cash and 0.9240 shares of Seacoast common stock (based on Seacoast’s closing price of $24.31 per share on November 3, 2017). (In thousands, except per share data) November 3, 2017 Shares exchanged for cash $ 15,694 Number of Palm Beach Community Bank Common shares outstanding 2,507 Per share exchange ratio 0.9240 Number of shares of common stock issued 2,316 Multiplied by common stock price per share on November 3, 2017 $ 24.31 Value of common stock issued 56,312 Total purchase price $ 72,006 The acquisition was accounted for under the acquisition method in accordance with ASC Topic 805, Business Combinations . The Company recognized goodwill of $34.8 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. Initially Reported November 3, 2017 Measurement Period Adjustments As Adjusted November 3, 2017 (In thousands) Assets: Cash $ 9,301 $ 0 $ 9,301 Investment securities 22,098 0 22,098 Loans, net 272,090 (1,772 ) 270,318 Fixed assets 7,641 0 7,641 Core deposit intangibles 2,523 0 2,523 Goodwill 33,428 1,323 34,751 Other assets 9,909 449 10,358 Totals $ 356,990 $ 0 $ 356,990 Liabilities: Deposits $ 268,633 $ 0 $ 268,633 Other liabilities 16,351 0 16,351 Totals $ 284,984 $ 0 $ 284,984 The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. As Adjusted November 3, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 30,153 $ 30,990 Commercial real estate 134,705 132,089 Construction/development/land 69,686 67,425 Commercial loans 36,076 35,876 Consumer and other loans 179 172 Purchased Credit Impaired 4,768 3,766 Total acquired loans $ 275,567 $ 270,318 For the loans acquired we first segregated all acquired loans with specifically identified credit deficiency 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 November 3, 2017 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. (In thousands) November 3, 2017 Contractually required principal and interest $ 4,768 Non-accretable difference (1,002 ) Cash flows expected to be collected 3,766 Accretable yield 0 Total purchased credit-impaired loan acquired $ 3,766 Loans without specifically identified credit deficiency factors are referred to as PULs for disclosure purposes. These loans were then evaluated to determine estimated fair values as of the acquisition date. Although no specific credit deficiencies were identifiable, we believe there is an element of risk as to whether all contractual cash flows will be eventually received. Factors that were considered included the economic environment both nationally and locally as well as the real estate market particularly in Florida. We have applied ASC Topic 310-20 accounting treatment to the PULs. The Company believes the deposits assumed from the acquisition have an intangible value. In determining the valuation amount, deposits were analyzed based on factors such as type of deposit, deposit retention, interest rates and age of deposit relationships. Pro-Forma Information Pro-forma data for the three and six months ended June 30, 2017 as if the acquisitions of Gulfshore, NSBC and PBCB occurred at the beginning of 2017 is as follows: Three Months Ended June 30, Six Months Ended June 30, (In thousands, except per share amounts) 2017 2017 Net interest income $ 45,987 $ 95,554 Net income 11,285 20,828 EPS - basic 0.25 0.46 EPS - diluted 0.25 0.45 Proposed Acquisition of First Green Bancorp, Inc. On June 11, 2018, the Company announced that it had entered into an agreement and plan of merger with First Green Bancorp, Inc.(“First Green”), the holding company for First Green Bank. The agreement provides that First Green will be merged with and into the Company and that First Green Bank will be merged with and into Seacoast Bank. First Green operates seven branches in the Orlando, Daytona and Fort Lauderdale markets with deposits of approximately $629 million and loans of $629 million as of March 31, 2018. This acquisition is anticipated to close in the fourth quarter of 2018, subject to the receipt of approvals from regulatory authorities, the approval of First Green shareholders and the satisfaction of other closing conditions .

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2018
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 six-month period ended June 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 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, 2017 .
Reclassification	Certain prior period amounts have been reclassified to conform to the current period presentation.
Adoption of New Accounting Pronouncements and Recent Issued Accounting Standards, Not Yet Adopted	Adoption of new accounting pronouncements On January 1, 2018, we adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2014-9, “Revenue from Contracts with Customers,” and all the related amendments (collectively, “ASC 606”) using the modified retrospective approach applied to all contracts in place at that date. Adoption had no material impact on the Company’s consolidated financial statements including no change to the amount or timing of revenue recognized for contracts within the scope of the new standard. Activity in the scope of the new standard includes: • Service Charges on Deposits : Seacoast National Bank ("Seacoast Bank") offers a variety of deposit-related services to its customers through several delivery channels including branch offices, ATMs, telephone, mobile, and internet banking. Transaction-based fees are recognized when services, each of which represents a performance obligation, are satisfied. Service fees may be assessed monthly, quarterly, or annually; however, the account agreements to which these fees relate can be cancelled at any time by Seacoast and/or the customer. Therefore, the contract term is considered a single day (a day-to-day contract). • Trust Fees : The Company earns trust fees from fiduciary services provided to trust customers which include custody of assets, recordkeeping, collection and distribution of funds. Fees are earned over time and accrued monthly as the Company provides services, and are generally assessed based on the market value of the trust assets under management at a particular date or over a particular period. • Brokerage Commissions and Fees : The Company earns commissions and fees from investment brokerage services provided to its customers through an arrangement with a third-party service provider. Commissions received from the third-party service provider are recorded monthly and are based upon customer activity. Fees are earned over time and accrued monthly as services are provided. The Company acts as an agent in this arrangement and therefore presents the brokerage commissions and fees net of related costs. • Interchange Income : Fees earned on card transactions depend upon the volume of activity, as well as the fees permitted by the payment network. Such fees are recognized by the Company upon fulfilling its performance obligation to approve the card transaction. On January 1, 2018, we adopted ASU 2016-1, “Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.” Upon adoption, we reclassified $0.1 million of accumulated unrealized loss pertaining to an equity investment previously classified as available for sale from Accumulated Other Comprehensive Income to Retained Earnings. 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 2016-02, Leases (Topic 842) Description In February 2016, the FASB amended existing guidance that requires lessees recognize the following for all leases at the commencement date: 1. A lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis. 2. A right-of-use specified asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. Certain targeted improvements were made to align lessor accounting with the lessee accounting model and Topic 606, Revenue from Contracts with Customers. In July 2018, the FASB issued ASU 2018-11, which provides an additional optional transition method. The additional transition method allows entities to initially apply the new lease standard at the adoption date by recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Consequently, an entity’s reporting for the comparative periods presented in the financial statements in which the entity adopts the new lease standard would continue to be in accordance with current GAAP (Topic 840), including disclosures. Date of Adoption This amendment is effective for public business entities for reporting periods beginning after December 15, 2018, including interim periods within that reporting period. Early adoption is permitted. Effect on the Consolidated Financial Statements The Company is in the process of evaluating its existing leases, which are primarily operating leases of branch properties and equipment, to determine the amounts to be recognized as right-of-use assets and lease liabilities. The Company will adopt the new standard effective January 1, 2019. The effect of adoption on the Company’s consolidated statements of income is not expected to be material. ASU 2016-13, Financial Instruments –Credit Losses (Topic 326) Description In June 2016, the 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 including 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 evaluating and implementing changes to 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 loan losses upon adoption, recorded as a one-time effect 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. ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased callable Debt Securities Description In March 2017, the FASB issued guidance which requires entities to amortize premiums on certain purchased callable debt securities to their earliest call date. The accounting for purchased callable debt securities held at a discount did not change. Amortizing the premium to the earliest call date generally aligns interest income recognition with the economics of instruments. This guidance requires a modified retrospective approach under which a cumulative adjustment will be made to retained earnings as of the beginning of the period in which it is adopted. Date of Adoption The amendments are effective for public business entities for annual periods beginning after December 15, 2018, including interim periods within those periods. Effect on the Consolidated Financial Statements The impact to the Company's consolidated financial statements from the adoption of this pronouncement is not expected to be material. ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities Description In August 2017, the FASB provided guidance to improve the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. The amendments also simplify the application of the hedge accounting guidance. Date of Adoption The amendments are effective for public business entities for annual periods beginning after December 15, 2018, including interim periods within those periods. Effect on the Consolidated Financial Statements The impact to the Company's 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 required the use of certain estimates by management in determining the Company’s assets, liabilities, revenues and expenses. Actual results could differ from those estimates. Specific areas, among others, requiring the application of management’s estimates include determination of the allowance for loan losses, the valuation of investment securities available for sale, fair value of impaired loans, contingent liabilities, fair value of other real estate owned, and the valuation of deferred tax assets. Actual results could differ from those estimates.

Recently Issued Accounting St20

Recently Issued Accounting Standards, Not Yet Adopted (Tables)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Schedule of 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 2016-02, Leases (Topic 842) Description In February 2016, the FASB amended existing guidance that requires lessees recognize the following for all leases at the commencement date: 1. A lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis. 2. A right-of-use specified asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. Certain targeted improvements were made to align lessor accounting with the lessee accounting model and Topic 606, Revenue from Contracts with Customers. In July 2018, the FASB issued ASU 2018-11, which provides an additional optional transition method. The additional transition method allows entities to initially apply the new lease standard at the adoption date by recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Consequently, an entity’s reporting for the comparative periods presented in the financial statements in which the entity adopts the new lease standard would continue to be in accordance with current GAAP (Topic 840), including disclosures. Date of Adoption This amendment is effective for public business entities for reporting periods beginning after December 15, 2018, including interim periods within that reporting period. Early adoption is permitted. Effect on the Consolidated Financial Statements The Company is in the process of evaluating its existing leases, which are primarily operating leases of branch properties and equipment, to determine the amounts to be recognized as right-of-use assets and lease liabilities. The Company will adopt the new standard effective January 1, 2019. The effect of adoption on the Company’s consolidated statements of income is not expected to be material. ASU 2016-13, Financial Instruments –Credit Losses (Topic 326) Description In June 2016, the 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 including 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 evaluating and implementing changes to 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 loan losses upon adoption, recorded as a one-time effect 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. ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased callable Debt Securities Description In March 2017, the FASB issued guidance which requires entities to amortize premiums on certain purchased callable debt securities to their earliest call date. The accounting for purchased callable debt securities held at a discount did not change. Amortizing the premium to the earliest call date generally aligns interest income recognition with the economics of instruments. This guidance requires a modified retrospective approach under which a cumulative adjustment will be made to retained earnings as of the beginning of the period in which it is adopted. Date of Adoption The amendments are effective for public business entities for annual periods beginning after December 15, 2018, including interim periods within those periods. Effect on the Consolidated Financial Statements The impact to the Company's consolidated financial statements from the adoption of this pronouncement is not expected to be material. ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities Description In August 2017, the FASB provided guidance to improve the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. The amendments also simplify the application of the hedge accounting guidance. Date of Adoption The amendments are effective for public business entities for annual periods beginning after December 15, 2018, including interim periods within those periods. Effect on the Consolidated Financial Statements The impact to the Company's consolidated financial statements from the adoption of this pronouncement is not expected to be material.

Earnings per Share (Tables)

Earnings per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	For the three and six months ended June 30, 2018 , options to purchase 479,000 and 378,000 shares, respectively, were antidilutive and not included in the computation of diluted earnings per share, compared to 269,000 and 149,000 , respectively, for the three and six months ended June 30, 2017 . The dilutive impact of restricted stock and stock options is calculated under the treasury method. Three Months Ended June 30, Six Months Ended (Dollars in thousands, except per share data) 2018 2017 2018 2017 Basic earnings per share Net income $ 16,964 $ 7,676 $ 34,991 $ 15,602 Average common stock outstanding 47,164,909 42,841,152 47,058,958 40,851,273 Net income per share $ 0.36 $ 0.18 $ 0.74 $ 0.38 Diluted earnings per share Net income $ 16,964 $ 7,676 $ 34,991 $ 15,602 Average common stock outstanding 47,164,909 42,841,152 47,058,958 40,851,273 Add: Dilutive effect of employee restricted stock and stock options 809,209 715,133 768,688 687,496 Average diluted stock outstanding 47,974,118 43,556,285 47,827,646 41,538,769 Net income per share $ 0.35 $ 0.18 $ 0.73 $ 0.38

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Fair Value of Securities Available for Sale	The gross amortized cost, gross unrealized gains and losses and gross fair value of securities available for sale and held to maturity at June 30, 2018 and December 31, 2017 (1) are summarized as follows: June 30, 2018 Gross Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (In thousands) Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Entities $ 8,372 $ 137 $ (44 ) $ 8,465 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 616,152 239 (21,510 ) 594,881 Private mortgage-backed securities and collateralized mortgage obligations 80,618 918 (404 ) 81,132 Collateralized loan obligations 226,549 98 (504 ) 226,143 Obligations of state and political subdivisions 44,491 339 (545 ) 44,285 Totals $ 976,182 $ 1,731 $ (23,007 ) $ 954,906 Debt securities held to maturity Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities $ 324,410 $ 0 $ (11,551 ) $ 312,859 Private mortgage-backed securities and collateralized mortgage obligations 22,127 241 (96 ) 22,272 Collateralized loan obligations 35,600 57 (1 ) 35,656 Totals $ 382,137 $ 298 $ (11,648 ) $ 370,787 December 31, 2017 Gross Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (In thousands) Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Entities $ 9,475 $ 274 $ (5 ) $ 9,744 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 560,396 1,163 (8,034 ) 553,525 Private mortgage-backed securities and collateralized mortgage obligations 75,152 1,154 (285 ) 76,021 Collateralized loan obligations 263,579 798 (68 ) 264,309 Obligations of state and political subdivisions 45,118 813 (70 ) 45,861 Totals $ 953,720 $ 4,202 $ (8,462 ) $ 949,460 Debt securities held to maturity Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities $ 353,541 $ 802 $ (4,159 ) $ 350,184 Private mortgage-backed securities and collateralized mortgage obligations 22,799 714 (53 ) 23,460 Collateralized loan obligations 40,523 303 0 40,826 Totals $ 416,863 $ 1,819 $ (4,212 ) $ 414,470 (1) December 31, 2017 balances in the tables above reflect certain reclassifications between categories.
Summary of Amortized Cost and Fair Value of Held-to-Maturity Securities	The gross amortized cost, gross unrealized gains and losses and gross fair value of securities available for sale and held to maturity at June 30, 2018 and December 31, 2017 (1) are summarized as follows: June 30, 2018 Gross Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (In thousands) Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Entities $ 8,372 $ 137 $ (44 ) $ 8,465 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 616,152 239 (21,510 ) 594,881 Private mortgage-backed securities and collateralized mortgage obligations 80,618 918 (404 ) 81,132 Collateralized loan obligations 226,549 98 (504 ) 226,143 Obligations of state and political subdivisions 44,491 339 (545 ) 44,285 Totals $ 976,182 $ 1,731 $ (23,007 ) $ 954,906 Debt securities held to maturity Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities $ 324,410 $ 0 $ (11,551 ) $ 312,859 Private mortgage-backed securities and collateralized mortgage obligations 22,127 241 (96 ) 22,272 Collateralized loan obligations 35,600 57 (1 ) 35,656 Totals $ 382,137 $ 298 $ (11,648 ) $ 370,787 December 31, 2017 Gross Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (In thousands) Debt securities available for sale U.S. Treasury securities and obligations of U.S. Government Entities $ 9,475 $ 274 $ (5 ) $ 9,744 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 560,396 1,163 (8,034 ) 553,525 Private mortgage-backed securities and collateralized mortgage obligations 75,152 1,154 (285 ) 76,021 Collateralized loan obligations 263,579 798 (68 ) 264,309 Obligations of state and political subdivisions 45,118 813 (70 ) 45,861 Totals $ 953,720 $ 4,202 $ (8,462 ) $ 949,460 Debt securities held to maturity Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities $ 353,541 $ 802 $ (4,159 ) $ 350,184 Private mortgage-backed securities and collateralized mortgage obligations 22,799 714 (53 ) 23,460 Collateralized loan obligations 40,523 303 0 40,826 Totals $ 416,863 $ 1,819 $ (4,212 ) $ 414,470 (1) December 31, 2017 balances in the tables above reflect certain reclassifications between categories.
Summary of Investments Classified by Contractual Maturity	The amortized cost and fair value of debt securities available for sale and held to maturity at June 30, 2018 , 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 Amortized Cost Fair Value Amortized Cost Fair Value (In thousands) Due in less than one year $ 0 $ 0 $ 15,119 $ 15,110 Due after one year through five years 3,600 3,599 64,674 64,761 Due after five years through ten years 29,000 29,053 183,806 183,290 Due after ten years 3,000 3,004 15,813 15,732 35,600 35,656 279,412 278,893 Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 324,410 312,859 616,152 594,881 Private mortgage-backed securities and collateralized mortgage obligations 22,127 22,272 80,618 81,132 Totals $ 382,137 $ 370,787 $ 976,182 $ 954,906
Schedule of Debt Securities in Unrealized Loss Position	The tables below indicate the amount of debt securities with unrealized losses and the period of time for which these losses were outstanding at June 30, 2018 and December 31, 2017 , respectively. June 30, 2018 Less than 12 months 12 months or longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (In thousands) U.S. Treasury securities and obligations of U.S. Government Entities $ 3,417 $ (44 ) $ 0 $ 0 $ 3,417 $ (44 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 420,280 (12,087 ) 468,753 (20,976 ) 889,033 (33,063 ) Private mortgage-backed securities and collateralized mortgage obligations 25,971 (210 ) 18,468 (291 ) 44,439 (501 ) Collateralized loan obligations 138,769 (502 ) 0 0 138,769 (502 ) Obligations of state and political subdivisions 9,896 (94 ) 20,330 (451 ) 30,226 (545 ) Totals $ 598,333 $ (12,937 ) $ 507,551 $ (21,718 ) $ 1,105,884 $ (34,655 ) December 31, 2017 Less than 12 months 12 months or longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (In thousands) U.S. Treasury securities and obligations of U.S. Government Entities $ 1,107 $ (5 ) $ 0 $ 0 $ 1,107 $ (5 ) Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities 304,723 (2,047 ) 413,725 (10,146 ) 718,448 (12,193 ) Private mortgage-backed securities and collateralized mortgage obligations 0 0 20,744 (338 ) 20,744 (338 ) Collateralized loan obligations 14,933 (68 ) 0 0 14,933 (68 ) Obligations of state and political subdivisions 5,414 (14 ) 5,864 (56 ) 11,278 (70 ) Totals $ 326,177 $ (2,134 ) $ 440,333 $ (10,540 ) $ 766,510 $ (12,674 )

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2018
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: June 30, 2018 Portfolio Loans PCI Loans PULs Total (In thousands) Construction and land development $ 250,314 $ 126 $ 108,630 $ 359,070 Commercial real estate 1,297,051 10,878 393,366 1,701,295 Residential real estate 941,728 1,417 160,800 1,103,945 Commercial and financial 548,758 794 69,318 618,870 Consumer 183,718 0 7,118 190,836 Totals 1 $ 3,221,569 $ 13,215 $ 739,232 $ 3,974,016 December 31, 2017 Portfolio Loans PCI Loans PULs Total (In thousands) Construction and land development $ 215,315 $ 1,121 $ 126,689 $ 343,125 Commercial real estate 1,170,618 9,776 459,598 1,639,992 Residential real estate 845,420 5,626 187,764 1,038,810 Commercial and financial 512,430 894 92,690 606,014 Consumer 178,826 0 10,610 189,436 Totals 1 $ 2,922,609 $ 17,417 $ 877,351 $ 3,817,377 (1) Net loan balances as of June 30, 2018 and December 31, 2017 include deferred costs of $15.0 million and $12.9 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: June 30, 2018 Current Accruing 30-59 Days Past Due Accruing 60-89 Days Past Due Accruing Greater Than 90 Days Nonaccrual Total Financing Receivables (In thousands) Portfolio Loans Construction and land development $ 250,053 $ 44 $ 0 $ 0 $ 217 $ 250,314 Commercial real estate 1,286,765 788 0 0 9,498 1,297,051 Residential real estate 930,666 2,296 0 0 8,766 941,728 Commerical and financial 543,301 4,544 0 0 913 548,758 Consumer 183,410 144 0 0 164 183,718 Totals 3,194,195 7,816 0 0 19,558 3,221,569 Purchased Unimpaired Loans Construction and land development 108,017 613 0 0 0 108,630 Commercial real estate 390,619 2,339 0 0 408 393,366 Residential real estate 155,520 1,274 109 0 3,897 160,800 Commerical and financial 67,366 1,459 0 493 0 69,318 Consumer 7,098 20 0 0 0 7,118 Totals 728,620 5,705 109 493 4,305 739,232 Purchased Credit Impaired Loans Construction and land development 126 0 0 0 0 126 Commercial real estate 9,451 0 0 0 1,427 10,878 Residential real estate 570 0 0 0 847 1,417 Commerical and financial 749 0 0 0 45 794 Consumer 0 0 0 0 0 0 Totals 10,896 0 0 0 2,319 13,215 Totals $ 3,933,711 $ 13,521 $ 109 $ 493 $ 26,182 $ 3,974,016 December 31, 2017 Current Accruing 30-59 Days Past Due Accruing 60-89 Days Past Due Accruing Greater Than 90 Days Nonaccrual Total Financing Receivables (In thousands) Portfolio Loans Construction and land development $ 215,077 $ 0 $ 0 $ 0 $ 238 $ 215,315 Commercial real estate 1,165,738 2,605 585 0 1,690 1,170,618 Residential real estate 836,117 812 75 0 8,416 845,420 Commercial and financial 507,501 2,776 26 0 2,127 512,430 Consumer 178,676 52 0 0 98 178,826 Totals 2,903,109 6,245 686 0 12,569 2,922,609 Purchased Unimpaired Loans Construction and land development 126,655 34 0 0 0 126,689 Commercial real estate 457,899 979 0 0 720 459,598 Residential real estate 186,549 128 87 0 1,000 187,764 Commercial and financial 92,315 54 0 0 321 92,690 Consumer 10,610 0 0 0 0 10,610 Totals 874,028 1,195 87 0 2,041 877,351 Purchased Credit Impaired Loans Construction and land development 1,121 0 0 0 0 1,121 Commercial real estate 9,352 0 0 0 424 9,776 Residential real estate 544 642 0 0 4,440 5,626 Commercial and financial 844 0 0 0 50 894 Consumer 0 0 0 0 0 0 Totals 11,861 642 0 0 4,914 17,417 Totals $ 3,788,998 $ 8,082 $ 773 $ 0 $ 19,524 $ 3,817,377
Schedule of Risk Categories of Loans by Class of Loans	The following tables present the risk category of loans by class of loans based on the most recent analysis performed as of June 30, 2018 and December 31, 2017 : June 30, 2018 Pass Special Mention Substandard Doubtful Total (In thousands) Construction and land development $ 351,792 $ 6,456 $ 822 $ 0 $ 359,070 Commercial real estate 1,647,630 19,716 33,949 0 1,701,295 Residential real estate 1,077,202 2,341 24,402 0 1,103,945 Commercial and financial 612,333 214 6,223 100 618,870 Consumer 188,894 1,338 604 0 190,836 Totals $ 3,877,851 $ 30,065 $ 66,000 $ 100 $ 3,974,016 December 31, 2017 Pass Special Mention Substandard Doubtful Total (In thousands) Construction and land development $ 328,127 $ 10,414 $ 4,584 $ 0 $ 343,125 Commercial real estate 1,586,932 29,273 23,787 0 1,639,992 Residential real estate 1,023,925 4,621 10,203 61 1,038,810 Commercial and financial 593,689 3,237 8,838 250 606,014 Consumer 189,354 0 82 0 189,436 Totals $ 3,722,027 $ 47,545 $ 47,494 $ 311 $ 3,817,377
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 June 30, Six Months Ended June 30, (In thousands) 2018 2017 2018 2017 Beginning balance $ 3,552 $ 3,510 $ 3,699 $ 3,807 Additions 0 0 0 0 Deletions 0 (10 ) (43 ) (10 ) Accretion (262 ) (451 ) (705 ) (816 ) Reclassification from non-accretable difference (101 ) 216 238 284 Ending balance $ 3,189 $ 3,265 $ 3,189 $ 3,265
Schedule of Loans Modified	The following table presents loans that were modified during the six months ended: Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Specific Reserve Recorded Valuation Allowance Recorded (In thousands) June 30, 2018 Commercial and financial 1 $ 98 $ 0 $ 0 $ 0 Totals 1 $ 98 $ 0 $ 0 $ 0 June 30, 2017 Construction and land development 1 $ 52 $ 46 $ 6 $ 6 Residential real estate 1 15 15 0 0 Totals 2 $ 67 $ 61 $ 6 $ 6
Schedule of Impaired Financing Receivables, Excluding PCI Loans and Valuation Allowances	As of June 30, 2018 and December 31, 2017 , the Company’s recorded investment in impaired loans, excluding PCI loans, the unpaid principal balance and related valuation allowance was as follows: June 30, 2018 Recorded Investment Unpaid Principal Balance Related Valuation Allowance (In thousands) Impaired Loans with No Related Allowance Recorded: Construction and land development $ 204 $ 484 $ 0 Commercial real estate 2,549 3,764 0 Residential real estate 13,847 18,352 0 Commercial and financial 0 0 0 Consumer 172 211 0 Impaired Loans with an Allowance Recorded: Construction and land development 224 238 24 Commercial real estate 13,116 13,144 525 Residential real estate 6,820 7,014 933 Commercial and financial 933 927 550 Consumer 267 273 41 Total Impaired Loans Construction and land development 428 722 24 Commercial real estate 15,665 16,908 525 Residential real estate 20,667 25,366 933 Commercial and financial 933 927 550 Consumer 439 484 41 Totals $ 38,132 $ 44,407 $ 2,073 December 31, 2017 Recorded Investment Unpaid Principal Balance Related Valuation Allowance (In thousands) Impaired Loans with No Related Allowance Recorded: Construction and land development $ 223 $ 510 $ 0 Commercial real estate 3,475 4,873 0 Residential real estate 10,272 15,063 0 Commercial and financial 19 29 0 Consumer 105 180 0 Impaired Loans with an Allowance Recorded: Construction and land development 251 264 23 Commercial real estate 4,780 4,780 195 Residential real estate 8,448 8,651 1,091 Commercial and financial 2,436 883 1,050 Consumer 282 286 43 Total Impaired Loans Construction and land development 474 774 23 Commercial real estate 8,255 9,653 195 Residential real estate 18,720 23,714 1,091 Commercial and financial 2,455 912 1,050 Consumer 387 466 43 Totals $ 30,291 $ 35,519 $ 2,402

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Schedule of Allowance for Loan Losses	Activity in the allowance for loan losses for the three month and six month periods ended June 30, 2018 and 2017 is summarized as follows: Three Months Ended June 30, 2018 Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance (In thousands) Construction & land development $ 2,058 $ 224 $ 0 $ 5 $ 0 $ 2,287 Commercial real estate 8,842 210 (14 ) 103 (15 ) 9,126 Residential real estate 8,047 414 (27 ) 433 (17 ) 8,850 Commercial and financial 7,393 1,630 (1,945 ) 24 0 7,102 Consumer 1,778 51 (328 ) 59 (1 ) 1,559 Totals $ 28,118 $ 2,529 $ (2,314 ) $ 624 $ (33 ) $ 28,924 Three Months Ended June 30, 2017 Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance (In thousands) Construction & land development $ 1,352 $ 128 $ 0 $ 94 $ 0 $ 1,574 Commercial real estate 9,861 (167 ) (82 ) 331 (20 ) 9,923 Residential real estate 7,064 324 (21 ) 99 (43 ) 7,423 Commercial and financial 4,635 1,193 (447 ) 79 0 5,460 Consumer 1,650 (77 ) (54 ) 102 (1 ) 1,620 Totals $ 24,562 $ 1,401 $ (604 ) $ 705 $ (64 ) $ 26,000 Six Months Ended June 30, 2018 Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance (In thousands) Construction & land development $ 1,642 $ 635 $ 0 $ 10 $ 0 $ 2,287 Commercial real estate 9,285 (365 ) (14 ) 250 (30 ) 9,126 Residential real estate 7,131 1,201 (27 ) 634 (89 ) 8,850 Commercial and financial 7,297 1,900 (2,143 ) 48 0 7,102 Consumer 1,767 243 (635 ) 186 (2 ) 1,559 Totals $ 27,122 $ 3,614 $ (2,819 ) $ 1,128 $ (121 ) $ 28,924 Six Months Ended June 30, 2017 Beginning Balance Provision for Loan Losses Charge- Offs Recoveries TDR Allowance Adjustments Ending Balance (In thousands) Construction & land development $ 1,219 $ 192 $ 0 $ 165 $ (2 ) $ 1,574 Commercial real estate 9,273 313 (68 ) 439 (34 ) 9,923 Residential real estate 7,483 (100 ) (112 ) 227 (75 ) 7,423 Commercial and financial 3,636 2,314 (616 ) 126 0 5,460 Consumer 1,789 (14 ) (312 ) 159 (2 ) 1,620 Totals $ 23,400 $ 2,705 $ (1,108 ) $ 1,116 $ (113 ) $ 26,000
Schedule of Loan Portfolio, Excluding PCI Loans and Related Allowance	The table below summarizes PCI loans that were individually evaluated for impairment based on expected cash flows at June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 PCI Loans Individually Evaluated for Impairment Recorded Investment Associated Allowance Recorded Investment Associated Allowance (in thousands) Construction & land development $ 126 $ 0 $ 1,121 $ 0 Commercial real estate 10,878 0 9,776 0 Residential real estate 1,417 0 5,626 0 Commercial and financial 794 0 894 0 Consumer 0 0 0 0 Totals $ 13,215 $ 0 $ 17,417 $ 0 The Company’s loan portfolio, excluding PCI loans, and related allowance at June 30, 2018 and December 31, 2017 is shown in the following tables: June 30, 2018 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance (In thousands) Construction & land development $ 428 $ 24 $ 358,516 $ 2,263 $ 358,944 $ 2,287 Commercial real estate 15,665 525 1,674,752 8,601 1,690,417 9,126 Residential real estate 20,668 933 1,081,860 7,917 1,102,528 8,850 Commercial and financial 933 550 617,143 6,552 618,076 7,102 Consumer 438 41 190,398 1,518 190,836 1,559 Totals $ 38,132 $ 2,073 $ 3,922,669 $ 26,851 $ 3,960,801 $ 28,924 December 31, 2017 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Recorded Investment Associated Allowance Recorded Investment Associated Allowance Recorded Investment Associated Allowance (In thousands) Construction & land development $ 474 $ 23 $ 341,530 $ 1,619 $ 342,004 $ 1,642 Commercial real estate 8,255 195 1,621,960 9,090 1,630,215 9,285 Residential real estate 18,720 1,091 1,014,465 6,040 1,033,185 7,131 Commercial and financial 2,455 1,050 602,666 6,247 605,121 7,297 Consumer 387 43 189,049 1,724 189,436 1,767 Totals $ 30,291 $ 2,402 $ 3,769,670 $ 24,720 $ 3,799,961 $ 27,122

Securities Sold Under Agreeme25

Securities Sold Under Agreements to Repurchase (Tables)	6 Months Ended
	Jun. 30, 2018
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: June 30, 2018 December 31, 2017 (In thousands) Fair-Value of Pledged Securities - overnight and continuous Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities $ 200,050 $ 216,094

Noninterest Income and Expense

Noninterest Income and Expense (Tables)	6 Months Ended
	Jun. 30, 2018
Brokers and Dealers [Abstract]
Summary of Noninterest Income and Expense	Detail of noninterest income and expenses for the three and six months ended June 30, 2018 and 2017 are as follows: Three Months Ended Six Months Ended June 30, June 30, 2018 2017 2018 2017 (In thousands) Noninterest income Service charges on deposit accounts $ 2,674 $ 2,435 $ 5,346 $ 4,857 Trust fees 1,039 917 2,060 1,797 Mortgage banking fees 1,336 1,272 2,738 2,824 Brokerage commissions and fees 461 351 820 728 Marine finance fees 446 326 1,019 460 Interchange income 3,076 2,785 6,018 5,419 BOLI income 1,066 757 2,122 1,490 Other income 2,671 1,624 5,044 2,797 12,769 10,467 25,167 20,372 Securities (losses)/gains, net (48 ) 21 (150 ) 21 Totals $ 12,721 $ 10,488 $ 25,017 $ 20,393 Noninterest expense Salaries and wages $ 16,429 $ 18,375 $ 31,810 $ 33,744 Employee benefits 3,034 2,935 6,115 6,003 Outsourced data processing costs 3,393 3,456 7,072 6,725 Telephone/data lines 643 648 1,255 1,180 Occupancy 3,316 4,421 6,433 7,578 Furniture and equipment 1,468 1,679 2,925 3,070 Marketing 1,344 1,074 2,596 1,996 Legal and professional fees 2,301 3,276 4,274 5,408 FDIC assessments 595 650 1,193 1,220 Amortization of intangibles 1,004 839 1,993 1,558 Net losses and disposition expense on other real estate owned 405 297 597 4 Other 4,314 3,975 9,147 7,885 Total $ 38,246 $ 41,625 $ 75,410 $ 76,371

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Assets Measured on Recurring and Nonrecurring Basis	Under ASC 820, fair value measurements for items measured at fair value on a recurring and nonrecurring basis at June 30, 2018 and December 31, 2017 included: Fair Value Measurements Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) June 30, 2018 Available for sale debt securities (1) $ 954,906 $ 100 $ 954,806 $ 0 Loans held for sale (2) 14,707 0 14,707 0 Loans (3) 11,525 0 2,822 8,703 Other real estate owned (4) 8,417 0 3,766 4,651 Equity securities (5) 6,193 6,193 0 0 December 31, 2017 Available for sale debt securities (1)(5) $ 949,460 $ 100 $ 949,360 $ 0 Loans held for sale (2) 24,306 0 24,306 0 Loans (3) 4,192 0 3,454 738 Other real estate owned (4) 7,640 0 60 7,580 Equity securities (5) 6,344 6,344 0 0 (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 F. 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 310. (4) Fair value is measured on a nonrecurring basis in accordance with ASC 360. (5) Prior to adoption of ASU 2016-1 on January 1, 2018, an investment in shares of a mutual fund that invests primarily in CRA-qualified debt securities was classified as an available for sale security. Beginning in 2018, this security is reported at fair value in Other Assets. Fair value is determined based on 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 June 30, 2018 and December 31, 2017 is as follows: (In thousands) June 30, 2018 December 31, 2017 Aggregate fair value $ 14,707 $ 24,306 Contractual balance 14,296 23,627 Excess 411 679
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 are not measured at fair value on a recurring basis in the balance sheet as of June 30, 2018 and December 31, 2017 is as follows: Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) June 30, 2018 Financial Assets Debt securities held to maturity (1) $ 382,137 $ 0 $ 370,787 $ 0 Time deposits with other banks 10,562 0 0 10,427 Loans, net 3,933,567 0 0 3,916,436 Financial Liabilities Deposit liabilities 4,697,440 0 0 4,692,308 Federal Home Loan Bank (FHLB) borrowings 205,000 0 0 204,980 Subordinated debt 70,664 0 61,654 0 December 31, 2017 Financial Assets Debt securities held to maturity (1) $ 416,863 $ 0 $ 414,470 $ 0 Time deposits with other banks 12,553 0 0 12,493 Loans, net 3,786,063 0 0 3,760,754 Financial Liabilities Deposit liabilities 4,592,720 0 0 4,588,515 Federal Home Loan Bank (FHLB) borrowings 211,000 0 0 211,000 Subordinated debt 70,521 0 61,530 0 (1) See Note D for further detail of individual investment categories.

Business Combinations (Tables)

Business Combinations (Tables)	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Summary of Purchase Price Calculation	(In thousands, except per share data) October 20, 2017 Shares exchanged for cash $ 4,701 Number of NorthStar Banking Corporation Common shares outstanding 1,958 Per share exchange ratio 0.5605 Number of shares of common stock issued 1,098 Multiplied by common stock price per share on October 20, 2017 $ 24.92 Value of common stock issued 27,353 Cash paid for NorthStar Banking Corporation vested stock options 801 Total purchase price $ 32,855 (In thousands, except per share data) November 3, 2017 Shares exchanged for cash $ 15,694 Number of Palm Beach Community Bank Common shares outstanding 2,507 Per share exchange ratio 0.9240 Number of shares of common stock issued 2,316 Multiplied by common stock price per share on November 3, 2017 $ 24.31 Value of common stock issued 56,312 Total purchase price $ 72,006 (In thousands, except per share data) April 7, 2017 Shares exchanged for cash $ 8,034 Number of GulfShore Bancshares, Inc. common shares outstanding 5,464 Per share exchange ratio 0.4807 Number of shares of common stock issued 2,627 Multiplied by common stock price per share on April 7, 2017 23.94 Value of common stock issued $ 62,883 Total purchase price $ 70,917
Schedule of Business Acquisitions, by Acquisition	Initially Reported November 3, 2017 Measurement Period Adjustments As Adjusted November 3, 2017 (In thousands) Assets: Cash $ 9,301 $ 0 $ 9,301 Investment securities 22,098 0 22,098 Loans, net 272,090 (1,772 ) 270,318 Fixed assets 7,641 0 7,641 Core deposit intangibles 2,523 0 2,523 Goodwill 33,428 1,323 34,751 Other assets 9,909 449 10,358 Totals $ 356,990 $ 0 $ 356,990 Liabilities: Deposits $ 268,633 $ 0 $ 268,633 Other liabilities 16,351 0 16,351 Totals $ 284,984 $ 0 $ 284,984 Initially Reported October 20 2017 Measurement Period Adjustments As Adjusted October 20, 2017 (In thousands) Assets: Cash $ 5,485 $ 0 $ 5,485 Investment securities 56,123 0 56,123 Loans, net 136,832 0 136,832 Fixed assets 2,637 0 2,637 Core deposit intangibles 1,275 0 1,275 Goodwill 12,404 (99 ) 12,305 Other assets 1,522 99 1,621 Totals $ 216,278 $ 0 $ 216,278 Liabilities: Deposits $ 182,443 $ 0 $ 182,443 Other liabilities 980 0 980 Totals $ 183,423 $ 0 $ 183,423 Initially Reported April 7, 2017 Measurement Period Adjustments As Adjusted April 7, 2017 (In thousands) Assets: Cash $ 55,540 $ 0 $ 55,540 Investment securities 316 0 316 Loans, net 250,876 0 250,876 Fixed assets 1,307 0 1,307 Other real estate owned 13 0 13 Core deposit intangibles 3,927 0 3,927 Goodwill 37,098 0 37,098 Other assets 8,572 0 8,572 Totals $ 357,649 0 $ 357,649 Liabilities: Deposits $ 285,350 $ 0 $ 285,350 Other liabilities 1,382 0 1,382 Totals $ 286,732 0 $ 286,732
Schedule of Fair Value of Acquired Loans and Unpaid Principal Balance	The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. April 7, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 101,281 $ 99,598 Commercial real estate 106,729 103,905 Construction/development/land 13,175 11,653 Commercial loans 32,137 32,247 Consumer and other loans 3,554 3,473 Purchased credit-impaired 0 0 Total acquired loans $ 256,876 $ 250,876 The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. As Adjusted November 3, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 30,153 $ 30,990 Commercial real estate 134,705 132,089 Construction/development/land 69,686 67,425 Commercial loans 36,076 35,876 Consumer and other loans 179 172 Purchased Credit Impaired 4,768 3,766 Total acquired loans $ 275,567 $ 270,318 The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date. October 20, 2017 (In thousands) Book Balance Fair Value Loans: Single family residential real estate $ 15,111 $ 15,096 Commercial real estate 73,139 69,554 Construction/development/land 11,706 10,390 Commercial loans 31,200 30,854 Consumer and other loans 6,761 6,645 Purchased Credit Impaired 5,527 4,293 Total acquired loans $ 143,444 $ 136,832
Schedule of Contractually Required Principal and Interest Payments Adjusted for Estimated Prepayments	(In thousands) November 3, 2017 Contractually required principal and interest $ 4,768 Non-accretable difference (1,002 ) Cash flows expected to be collected 3,766 Accretable yield 0 Total purchased credit-impaired loan acquired $ 3,766 (In thousands) October 20, 2017 Contractually required principal and interest $ 5,596 Non-accretable difference (689 ) Cash flows expected to be collected 4,907 Accretable yield (614 ) Total purchased credit-impaired loan acquired $ 4,293
Summary of Pro-Forma Data including Acquisition of Gulfshore, NSBC and PBCB	Pro-forma data for the three and six months ended June 30, 2017 as if the acquisitions of Gulfshore, NSBC and PBCB occurred at the beginning of 2017 is as follows: Three Months Ended June 30, Six Months Ended June 30, (In thousands, except per share amounts) 2017 2017 Net interest income $ 45,987 $ 95,554 Net income 11,285 20,828 EPS - basic 0.25 0.46 EPS - diluted 0.25 0.45

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Details) $ in Millions	Jan. 01, 2018USD ($)
Accounting Policies [Abstract]
Reclassification of accumulated unrealized loss	$ 0.1

Earnings per Share - Additional

Earnings per Share - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 21, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Antidilutive securities excluded from diluted earnings per share calculation (in shares)		479,000	269,000	378,000	149,000
Shares of common stock issued (in shares)	2,702,500
Net proceeds from issuance of common stock	$ 55,700,000			$ 0	$ 55,641,000
CapGen Capital Group III LP
Shares of common stock issued (in shares)	6,210,000
Net proceeds from issuance of common stock	$ 0

Earnings per Share - Schedule o

Earnings per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic earnings per share
Net income	$ 16,964	$ 7,676	$ 34,991	$ 15,602
Average common stock outstanding (in shares)	47,164,909	42,841,152	47,058,958	40,851,273
Net income per share (in dollars per share)	$ 0.36	$ 0.18	$ 0.74	$ 0.38
Diluted earnings per share
Net income	$ 16,964	$ 7,676	$ 34,991	$ 15,602
Average common stock outstanding (in shares)	47,164,909	42,841,152	47,058,958	40,851,273
Add: Dilutive effect of employee restricted stock and stock options (in shares)	809,209	715,133	768,688	687,496
Average shares outstanding - diluted (in shares)	47,974,118	43,556,285	47,827,646	41,538,769
Net income per share (in dollars per share)	$ 0.35	$ 0.18	$ 0.73	$ 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	Jun. 30, 2018	Dec. 31, 2017
Debt securities available for sale
Available for sale, amortized cost, total	$ 976,182	$ 953,720
Available for sale, gross unrealized gains	1,731	4,202
Available for sale, gross unrealized losses	(23,007)	(8,462)
Available for sale, fair value	954,906	949,460
Debt securities held to maturity
Held to maturity, amortized cost, total	382,137	416,863
Held to maturity, gross unrealized gains	298	1,819
Held to maturity, gross unrealized losses	(11,648)	(4,212)
Held to maturity, fair value	370,787	414,470
U.S. Treasury securities and obligations of U.S. Government Entities
Debt securities available for sale
Available for sale, amortized cost, total	8,372	9,475
Available for sale, gross unrealized gains	137	274
Available for sale, gross unrealized losses	(44)	(5)
Available for sale, fair value	8,465	9,744
Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities
Debt securities available for sale
Available for sale, amortized cost, total	616,152	560,396
Available for sale, gross unrealized gains	239	1,163
Available for sale, gross unrealized losses	(21,510)	(8,034)
Available for sale, fair value	594,881	553,525
Debt securities held to maturity
Held to maturity, amortized cost, total	324,410	353,541
Held to maturity, gross unrealized gains	0	802
Held to maturity, gross unrealized losses	(11,551)	(4,159)
Held to maturity, fair value	312,859	350,184
Private mortgage-backed securities and collateralized mortgage obligations
Debt securities available for sale
Available for sale, amortized cost, total	80,618	75,152
Available for sale, gross unrealized gains	918	1,154
Available for sale, gross unrealized losses	(404)	(285)
Available for sale, fair value	81,132	76,021
Debt securities held to maturity
Held to maturity, amortized cost, total	22,127	22,799
Held to maturity, gross unrealized gains	241	714
Held to maturity, gross unrealized losses	(96)	(53)
Held to maturity, fair value	22,272	23,460
Collateralized loan obligations
Debt securities available for sale
Available for sale, amortized cost, total	226,549	263,579
Available for sale, gross unrealized gains	98	798
Available for sale, gross unrealized losses	(504)	(68)
Available for sale, fair value	226,143	264,309
Debt securities held to maturity
Held to maturity, amortized cost, total	35,600	40,523
Held to maturity, gross unrealized gains	57	303
Held to maturity, gross unrealized losses	(1)	0
Held to maturity, fair value	35,656	40,826
Obligations of state and political subdivisions
Debt securities available for sale
Available for sale, amortized cost, total	44,491	45,118
Available for sale, gross unrealized gains	339	813
Available for sale, gross unrealized losses	(545)	(70)
Available for sale, fair value	$ 44,285	$ 45,861

Securities - Additional Informa

Securities - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sale of debt securities available for sale		$ 3,800,000	$ 0	$ 3,820,000
Gross gains from sale of securities		21,000		21,000
Gross losses from sale of securities		$ 0		$ 0
Decline in value of an investment in shares of mutual funds	$ 100,000		200,000
Unrealized losses from securities transferred from available for sale to held to maturity			3,100,000
Unamortized balance of securities transferred from available for sale to held to maturity	900,000		900,000
Fair value for securities in unrealized loss position for less than twelve months	598,333,000		598,333,000		$ 326,177,000
Unrealized losses on securities in unrealized loss position for less than twelve months	12,937,000		12,937,000		2,134,000
Fair value for securities in unrealized loss position for twelve months or more	507,551,000		507,551,000		440,333,000
Unrealized losses on securities in unrealized loss position for more than twelve months	21,718,000		21,718,000		10,540,000
Unrealized losses on mortgage backed securities of government sponsored entities	34,655,000		34,655,000		12,674,000
Fair value of mortgage backed securities of government sponsored entities	1,105,884,000		1,105,884,000		766,510,000
Other assets	$ 35,000,000		$ 35,000,000		$ 33,000,000
Shares held (in shares)	47,163,109		47,163,109		46,917,735
Ownership basis	0.00%		0.00%
Mutual Fund
Schedule of Available-for-sale Securities [Line Items]
Investment in mutual fund carried at fair value	$ 6,200,000		$ 6,200,000
Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Fair value for securities in unrealized loss position for less than twelve months	57,700,000		57,700,000		$ 22,900,000
Unrealized losses on securities in unrealized loss position for less than twelve months	1,200,000		1,200,000		200,000
Fair value for securities in unrealized loss position for twelve months or more	13,100,000		13,100,000		15,300,000
Unrealized losses on securities in unrealized loss position for more than twelve months	700,000		700,000		400,000
Carrying Value | Repurchase Agreement
Schedule of Available-for-sale Securities [Line Items]
Fair value of debt securities pledged as collateral	200,100,000		200,100,000
Public and Trust Deposits | Carrying Value
Schedule of Available-for-sale Securities [Line Items]
Fair value of debt securities pledged as collateral	172,700,000		172,700,000
Private collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Fair value for securities in unrealized loss position for less than twelve months	420,280,000		420,280,000		304,723,000
Unrealized losses on securities in unrealized loss position for less than twelve months	12,087,000		12,087,000		2,047,000
Fair value for securities in unrealized loss position for twelve months or more	468,753,000		468,753,000		413,725,000
Unrealized losses on securities in unrealized loss position for more than twelve months	20,976,000		20,976,000		10,146,000
Unrealized losses on mortgage backed securities of government sponsored entities	33,063,000		33,063,000		12,193,000
Fair value of mortgage backed securities of government sponsored entities	889,033,000		889,033,000		718,448,000
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses on mortgage backed securities of government sponsored entities	500,000		500,000
Fair value of mortgage backed securities of government sponsored entities	138,700,000		138,700,000
Private Collateralized Securities
Schedule of Available-for-sale Securities [Line Items]
Fair value of mortgage backed securities of government sponsored entities	889,000,000		889,000,000
Seasoned Residential Collateral Of Us Government Sponsored Entities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses on mortgage backed securities of government sponsored entities	500,000		500,000
Fair value of mortgage backed securities of government sponsored entities	44,400,000		44,400,000
Obligations of state and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Fair value for securities in unrealized loss position for less than twelve months	9,896,000		9,896,000		5,414,000
Unrealized losses on securities in unrealized loss position for less than twelve months	94,000		94,000		14,000
Fair value for securities in unrealized loss position for twelve months or more	20,330,000		20,330,000		5,864,000
Unrealized losses on securities in unrealized loss position for more than twelve months	451,000		451,000		56,000
Unrealized losses on mortgage backed securities of government sponsored entities	545,000		545,000		70,000
Fair value of mortgage backed securities of government sponsored entities	$ 30,226,000		$ 30,226,000		$ 11,278,000
Visa | Common Class B
Schedule of Available-for-sale Securities [Line Items]
Shares held (in shares)	11,330		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 (in dollars per share)	$ 1.6298		$ 1.6298
Shares issued (in shares)			18,465
Maximum | Seasoned Residential Collateral Of Us Government Sponsored Entities
Schedule of Available-for-sale Securities [Line Items]
Mortgage term			30 years
Minimum | Seasoned Residential Collateral Of Us Government Sponsored Entities
Schedule of Available-for-sale Securities [Line Items]
Mortgage term			15 years

Securities - Amortized Cost a34

Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held to maturity, amortized cost, total	$ 382,137	$ 416,863
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held to maturity, fair value, total	370,787	414,470
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	976,182	953,720
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	954,906	949,460
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	324,410
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held to maturity, fair value, total	312,859	350,184
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	616,152	560,396
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	594,881	553,525
Private mortgage backed securities
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held to maturity, amortized cost, total	22,127
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held to maturity, fair value, total	22,272	23,460
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, total	80,618	75,152
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, total	81,132	$ 76,021
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	3,600
Held to maturity, amortized cost, due after five years through ten years	29,000
Held to maturity, amortized cost, due after ten years	3,000
Held to maturity, amortized cost, total	35,600
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	3,599
Held to maturity, fair value, due after five years through ten years	29,053
Held to maturity, fair value, due after ten years	3,004
Held to maturity, fair value, total	35,656
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available for sale, amortized cost, due in less than one year	15,119
Available for sale, amortized cost, due after one year through five years	64,674
Available for sale, amortized cost, due after five years through ten years	183,806
Available for sale, amortized cost, due after ten years	15,813
Available for sale, amortized cost, total	279,412
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available for sale, fair value, due in less than one year	15,110
Available for sale, fair value, due after one year through five years	64,761
Available for sale, fair value, due after five years through ten years	183,290
Available for sale, fair value, due after ten years	15,732
Available for sale, fair value, total	$ 278,893

Securities - Schedule of Unreal

Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value
Less than 12 months	$ 598,333	$ 326,177
12 months or longer	507,551	440,333
Total	1,105,884	766,510
Unrealized Losses
Less than 12 months	(12,937)	(2,134)
12 months or longer	(21,718)	(10,540)
Total	(34,655)	(12,674)
Collateralized loan obligations
Fair Value
Less than 12 months	138,769	14,933
12 months or longer	0	0
Total	138,769	14,933
Unrealized Losses
Less than 12 months	(502)	(68)
12 months or longer	0	0
Total	(502)	(68)
Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities
Fair Value
Less than 12 months	420,280	304,723
12 months or longer	468,753	413,725
Total	889,033	718,448
Unrealized Losses
Less than 12 months	(12,087)	(2,047)
12 months or longer	(20,976)	(10,146)
Total	(33,063)	(12,193)
Private collateralized mortgage obligations
Fair Value
Less than 12 months	25,971	0
12 months or longer	18,468	20,744
Total	44,439	20,744
Unrealized Losses
Less than 12 months	(210)	0
12 months or longer	(291)	(338)
Total	(501)	(338)
Obligations of state and political subdivisions
Fair Value
Less than 12 months	9,896	5,414
12 months or longer	20,330	5,864
Total	30,226	11,278
Unrealized Losses
Less than 12 months	(94)	(14)
12 months or longer	(451)	(56)
Total	(545)	(70)
U.S. Treasury securities and obligations of U.S. Government Entities
Fair Value
Less than 12 months	3,417	1,107
12 months or longer	0	0
Total	3,417	1,107
Unrealized Losses
Less than 12 months	(44)	(5)
12 months or longer	0	0
Total	$ (44)	$ (5)

Loans - Schedule of Portfolio L

Loans - Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	$ 3,974,016	$ 3,817,377
Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	618,870	606,014
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	190,836	189,436
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	359,070	343,125
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	1,701,295	1,639,992
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	1,103,945	1,038,810
Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	3,221,569	2,922,609
Portfolio Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	548,758	512,430
Portfolio Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	183,718	178,826
Portfolio Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	250,314	215,315
Portfolio Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	1,297,051	1,170,618
Portfolio Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	941,728	845,420
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	13,215	17,417
PCI Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	794	894
PCI Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	0	0
PCI Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	126	1,121
PCI Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	10,878	9,776
PCI Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	1,417	5,626
PULs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	739,232	877,351
PULs | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	69,318	92,690
PULs | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	7,118	10,610
PULs | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	108,630	126,689
PULs | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	393,366	459,598
PULs | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Totals	160,800	187,764
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred costs	$ 15,000	$ 12,900

Loans - Past Due Financing Rece

Loans - Past Due Financing Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 3,933,711	$ 3,788,998
Nonaccrual	26,182	19,524
Total Financing Receivables	3,974,016	3,817,377
Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	13,521	8,082
Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	109	773
Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	493	0
Portfolio Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,194,195	2,903,109
Nonaccrual	19,558	12,569
Total Financing Receivables	3,221,569	2,922,609
Portfolio Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	7,816	6,245
Portfolio Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	686
Portfolio Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Purchased Unimpaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	728,620	874,028
Nonaccrual	4,305	2,041
Total Financing Receivables	739,232	877,351
Purchased Unimpaired Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	5,705	1,195
Purchased Unimpaired Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	109	87
Purchased Unimpaired Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	493	0
Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	10,896	11,861
Nonaccrual	2,319	4,914
Total Financing Receivables	13,215	17,417
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	642
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
Commercial real estate | Portfolio Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,286,765	1,165,738
Nonaccrual	9,498	1,690
Total Financing Receivables	1,297,051	1,170,618
Commercial real estate | Portfolio Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	788	2,605
Commercial real estate | Portfolio Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	585
Commercial real estate | Portfolio Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Commercial real estate | Purchased Unimpaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	390,619	457,899
Nonaccrual	408	720
Total Financing Receivables	393,366	459,598
Commercial real estate | Purchased Unimpaired Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	2,339	979
Commercial real estate | Purchased Unimpaired Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Commercial real estate | Purchased Unimpaired Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Commercial real estate | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	9,451	9,352
Nonaccrual	1,427	424
Total Financing Receivables	10,878	9,776
Commercial real estate | 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	0
Commercial real estate | 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
Commercial real estate | 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
Commerical and financial | Portfolio Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	543,301	507,501
Nonaccrual	913	2,127
Total Financing Receivables	548,758	512,430
Commerical and financial | Portfolio Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	4,544	2,776
Commerical and financial | Portfolio Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	26
Commerical and financial | Portfolio Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Commerical and financial | Purchased Unimpaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	67,366	92,315
Nonaccrual	0	321
Total Financing Receivables	69,318	92,690
Commerical and financial | Purchased Unimpaired Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,459	54
Commerical and financial | Purchased Unimpaired Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Commerical and financial | Purchased Unimpaired Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	493	0
Commerical and financial | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	749	844
Nonaccrual	45	50
Total Financing Receivables	794	894
Commerical and financial | 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	0
Commerical and financial | 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
Commerical and financial | 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
Consumer | Portfolio Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	183,410	178,676
Nonaccrual	164	98
Total Financing Receivables	183,718	178,826
Consumer | Portfolio Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	144	52
Consumer | Portfolio Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Consumer | Portfolio Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Consumer | Purchased Unimpaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	7,098	10,610
Nonaccrual	0	0
Total Financing Receivables	7,118	10,610
Consumer | Purchased Unimpaired Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	20	0
Consumer | Purchased Unimpaired Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Consumer | Purchased Unimpaired Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Consumer | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	0	0
Nonaccrual	0	0
Total Financing Receivables	0	0
Consumer | 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	0
Consumer | 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
Consumer | 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
Construction and land development | Portfolio Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	250,053	215,077
Nonaccrual	217	238
Total Financing Receivables	250,314	215,315
Construction and land development | Portfolio Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	44	0
Construction and land development | Portfolio Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Construction and land development | Portfolio Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Construction and land development | Purchased Unimpaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	108,017	126,655
Nonaccrual	0	0
Total Financing Receivables	108,630	126,689
Construction and land development | Purchased Unimpaired Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	613	34
Construction and land development | Purchased Unimpaired Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Construction and land development | Purchased Unimpaired Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Construction and land development | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	126	1,121
Nonaccrual	0	0
Total Financing Receivables	126	1,121
Construction and land development | 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	0
Construction and land development | 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
Construction and land development | 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
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Financing Receivables	1,103,945	1,038,810
Residential real estate | Portfolio Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	930,666	836,117
Nonaccrual	8,766	8,416
Total Financing Receivables	941,728	845,420
Residential real estate | Portfolio Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	2,296	812
Residential real estate | Portfolio Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	75
Residential real estate | Portfolio Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Residential real estate | Purchased Unimpaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	155,520	186,549
Nonaccrual	3,897	1,000
Total Financing Receivables	160,800	187,764
Residential real estate | Purchased Unimpaired Loans | Accruing 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,274	128
Residential real estate | Purchased Unimpaired Loans | Accruing 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	109	87
Residential real estate | Purchased Unimpaired Loans | Accruing Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Residential real estate | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	570	544
Nonaccrual	847	4,440
Total Financing Receivables	1,417	5,626
Residential real estate | 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	642
Residential real estate | 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
Residential real estate | 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

Loans - Risk Categories of Loan

Loans - Risk Categories of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 3,974,016	$ 3,817,377
Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Loans	359,070	343,125
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	1,701,295	1,639,992
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	1,103,945	1,038,810
Commercial and financial
Financing Receivable, Recorded Investment [Line Items]
Loans	618,870	606,014
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	190,836	189,436
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	3,877,851	3,722,027
Pass | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Loans	351,792	328,127
Pass | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	1,647,630	1,586,932
Pass | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	1,077,202	1,023,925
Pass | Commercial and financial
Financing Receivable, Recorded Investment [Line Items]
Loans	612,333	593,689
Pass | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	188,894	189,354
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	30,065	47,545
Special Mention | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Loans	6,456	10,414
Special Mention | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	19,716	29,273
Special Mention | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	2,341	4,621
Special Mention | Commercial and financial
Financing Receivable, Recorded Investment [Line Items]
Loans	214	3,237
Special Mention | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	1,338	0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	66,000	47,494
Substandard | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Loans	822	4,584
Substandard | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	33,949	23,787
Substandard | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	24,402	10,203
Substandard | Commercial and financial
Financing Receivable, Recorded Investment [Line Items]
Loans	6,223	8,838
Substandard | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	604	82
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	100	311
Doubtful | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	0	61
Doubtful | Commercial and financial
Financing Receivable, Recorded Investment [Line Items]
Loans	100	250
Doubtful | Consumer
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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$ 3,552	$ 3,510	$ 3,699	$ 3,807
Additions	0	0	0	0
Deletions	0	(10)	(43)	(10)
Accretion	(262)	(451)	(705)	(816)
Reclassification from non-accretable difference	(101)	216	238	284
Ending balance	$ 3,189	$ 3,265	$ 3,189	$ 3,265

Loans - Modified Loans (Details

Loans - Modified Loans (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)contract	Jun. 30, 2017USD ($)contract
Finite-Lived Intangible Assets [Line Items]
Number of Contracts | contract	1	2
Pre- Modification Outstanding Recorded Investment	$ 98	$ 67
Post- Modification Outstanding Recorded Investment	0	61
Specific Reserve Recorded	0	6
Valuation Allowance Recorded	$ 0	$ 6
Commercial and financial
Finite-Lived Intangible Assets [Line Items]
Number of Contracts | contract	1
Pre- Modification Outstanding Recorded Investment	$ 98
Post- Modification Outstanding Recorded Investment	0
Specific Reserve Recorded	0
Valuation Allowance Recorded	$ 0
Construction and land development
Finite-Lived Intangible Assets [Line Items]
Number of Contracts | contract		1
Pre- Modification Outstanding Recorded Investment		$ 52
Post- Modification Outstanding Recorded Investment		46
Specific Reserve Recorded		6
Valuation Allowance Recorded		$ 6
Residential real estate
Finite-Lived Intangible Assets [Line Items]
Number of Contracts | contract		1
Pre- Modification Outstanding Recorded Investment		$ 15
Post- Modification Outstanding Recorded Investment		15
Specific Reserve Recorded		0
Valuation Allowance Recorded		$ 0

Loans - Additional Information

Loans - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)
Receivables [Abstract]
Payments for loans in default, number of payments	1	0	1	0
Payments for loans in default	$ 100,000	$ 0	$ 100,000	$ 0
Troubled debt restructuring outstanding amount	14,200,000		14,200,000		$ 15,600,000
Average impaired loans	34,400,000	32,800,000	32,200,000	31,700,000
Interest income recorded on impaired loans	600,000	400,000	900,000	700,000
Interest income related to impaired loans with impairment measured on present value of expected future cash flows	$ 33,000	$ 64,000	$ 121,000	$ 113,000

Loans - Impaired Financing Rece

Loans - Impaired Financing Receivables, Excluding PCI Loans and Valuation Allowances (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Recorded Investment
Total	$ 38,132	$ 30,291
Unpaid Principal Balance
Total	44,407	35,519
Related Valuation Allowance
Total	2,073	2,402
Construction and land development
Recorded Investment
Impaired Loans with No Related Allowance Recorded	204	223
Impaired Loans with an Allowance Recorded	224	251
Total	428	474
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	484	510
Impaired Loans with an Allowance Recorded	238	264
Total	722	774
Related Valuation Allowance
Impaired Loans with No Related Allowance Recorded	0	0
Impaired Loans with an Allowance Recorded	24	23
Total	24	23
Commercial real estate
Recorded Investment
Impaired Loans with No Related Allowance Recorded	2,549	3,475
Impaired Loans with an Allowance Recorded	13,116	4,780
Total	15,665	8,255
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	3,764	4,873
Impaired Loans with an Allowance Recorded	13,144	4,780
Total	16,908	9,653
Related Valuation Allowance
Impaired Loans with No Related Allowance Recorded	0	0
Impaired Loans with an Allowance Recorded	525	195
Total	525	195
Residential real estate
Recorded Investment
Impaired Loans with No Related Allowance Recorded	13,847	10,272
Impaired Loans with an Allowance Recorded	6,820	8,448
Total	20,667	18,720
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	18,352	15,063
Impaired Loans with an Allowance Recorded	7,014	8,651
Total	25,366	23,714
Related Valuation Allowance
Impaired Loans with No Related Allowance Recorded	0	0
Impaired Loans with an Allowance Recorded	933	1,091
Total	933	1,091
Commercial and financial
Recorded Investment
Impaired Loans with No Related Allowance Recorded	0	19
Impaired Loans with an Allowance Recorded	933	2,436
Total	933	2,455
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	0	29
Impaired Loans with an Allowance Recorded	927	883
Total	927	912
Related Valuation Allowance
Impaired Loans with No Related Allowance Recorded	0	0
Impaired Loans with an Allowance Recorded	550	1,050
Total	550	1,050
Consumer
Recorded Investment
Impaired Loans with No Related Allowance Recorded	172	105
Impaired Loans with an Allowance Recorded	267	282
Total	439	387
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	211	180
Impaired Loans with an Allowance Recorded	273	286
Total	484	466
Related Valuation Allowance
Impaired Loans with No Related Allowance Recorded	0	0
Impaired Loans with an Allowance Recorded	41	43
Total	$ 41	$ 43

Allowance for Loan Losses - Act

Allowance for Loan Losses - Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Allowance for Loan Losses:
Beginning Balance	$ 28,118	$ 24,562	$ 27,122	$ 23,400
Provision for Loan Losses	2,529	1,401	3,614	2,705
Charge- Offs	(2,314)	(604)	(2,819)	(1,108)
Recoveries	624	705	1,128	1,116
TDR Allowance Adjustments	(33)	(64)	(121)	(113)
Ending Balance	28,924	26,000	28,924	26,000
Construction and land development
Allowance for Loan Losses:
Beginning Balance	2,058	1,352	1,642	1,219
Provision for Loan Losses	224	128	635	192
Charge- Offs	0	0	0	0
Recoveries	5	94	10	165
TDR Allowance Adjustments	0	0	0	(2)
Ending Balance	2,287	1,574	2,287	1,574
Commercial real estate
Allowance for Loan Losses:
Beginning Balance	8,842	9,861	9,285	9,273
Provision for Loan Losses	210	(167)	(365)	313
Charge- Offs	(14)	(82)	(14)	(68)
Recoveries	103	331	250	439
TDR Allowance Adjustments	(15)	(20)	(30)	(34)
Ending Balance	9,126	9,923	9,126	9,923
Residential real estate
Allowance for Loan Losses:
Beginning Balance	8,047	7,064	7,131	7,483
Provision for Loan Losses	414	324	1,201	(100)
Charge- Offs	(27)	(21)	(27)	(112)
Recoveries	433	99	634	227
TDR Allowance Adjustments	(17)	(43)	(89)	(75)
Ending Balance	8,850	7,423	8,850	7,423
Commercial and financial
Allowance for Loan Losses:
Beginning Balance	7,393	4,635	7,297	3,636
Provision for Loan Losses	1,630	1,193	1,900	2,314
Charge- Offs	(1,945)	(447)	(2,143)	(616)
Recoveries	24	79	48	126
TDR Allowance Adjustments	0	0	0	0
Ending Balance	7,102	5,460	7,102	5,460
Consumer
Allowance for Loan Losses:
Beginning Balance	1,778	1,650	1,767	1,789
Provision for Loan Losses	51	(77)	243	(14)
Charge- Offs	(328)	(54)	(635)	(312)
Recoveries	59	102	186	159
TDR Allowance Adjustments	(1)	(1)	(2)	(2)
Ending Balance	$ 1,559	$ 1,620	$ 1,559	$ 1,620

Allowance for Loan Losses - Sch

Allowance for Loan Losses - Schedule of Loan Portfolio, Excluding PCI Loans and Related Allowance (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Recorded Investment
Individually Evaluated for Impairment	$ 38,132	$ 30,291
Financing Receivable, Collectively Evaluated for Impairment	3,922,669	3,769,670
Total	3,960,801	3,799,961
Associated Allowance
Individually Evaluated for Impairment	2,073	2,402
Collectively Evaluated for Impairment	26,851	24,720
Total	28,924	27,122
PCI Loans
Recorded Investment
Individually Evaluated for Impairment	13,215	17,417
Associated Allowance
Individually Evaluated for Impairment	0	0
Construction and land development
Recorded Investment
Individually Evaluated for Impairment	428	474
Financing Receivable, Collectively Evaluated for Impairment	358,516	341,530
Total	358,944	342,004
Associated Allowance
Individually Evaluated for Impairment	24	23
Collectively Evaluated for Impairment	2,263	1,619
Total	2,287	1,642
Construction and land development | PCI Loans
Recorded Investment
Individually Evaluated for Impairment	126	1,121
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial real estate
Recorded Investment
Individually Evaluated for Impairment	15,665	8,255
Financing Receivable, Collectively Evaluated for Impairment	1,674,752	1,621,960
Total	1,690,417	1,630,215
Associated Allowance
Individually Evaluated for Impairment	525	195
Collectively Evaluated for Impairment	8,601	9,090
Total	9,126	9,285
Commercial real estate | PCI Loans
Recorded Investment
Individually Evaluated for Impairment	10,878	9,776
Associated Allowance
Individually Evaluated for Impairment	0	0
Residential real estate
Recorded Investment
Individually Evaluated for Impairment	20,668	18,720
Financing Receivable, Collectively Evaluated for Impairment	1,081,860	1,014,465
Total	1,102,528	1,033,185
Associated Allowance
Individually Evaluated for Impairment	933	1,091
Collectively Evaluated for Impairment	7,917	6,040
Total	8,850	7,131
Residential real estate | PCI Loans
Recorded Investment
Individually Evaluated for Impairment	1,417	5,626
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial and financial
Recorded Investment
Individually Evaluated for Impairment	933	2,455
Financing Receivable, Collectively Evaluated for Impairment	617,143	602,666
Total	618,076	605,121
Associated Allowance
Individually Evaluated for Impairment	550	1,050
Collectively Evaluated for Impairment	6,552	6,247
Total	7,102	7,297
Commercial and financial | PCI Loans
Recorded Investment
Individually Evaluated for Impairment	794	894
Associated Allowance
Individually Evaluated for Impairment	0	0
Consumer
Recorded Investment
Individually Evaluated for Impairment	438	387
Financing Receivable, Collectively Evaluated for Impairment	190,398	189,049
Total	190,836	189,436
Associated Allowance
Individually Evaluated for Impairment	41	43
Collectively Evaluated for Impairment	1,518	1,724
Total	1,559	1,767
Consumer | PCI Loans
Recorded Investment
Individually Evaluated for Impairment	0	0
Associated Allowance
Individually Evaluated for Impairment	$ 0	$ 0

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Details) - Loans - Bank Shares, Inc - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Remaining fair value adjustment for loans acquired	$ 15.5	$ 19.4
Percentage of fair value adjustment for loans acquired	2.10%	2.20%

Securities Sold Under Agreeme46

Securities Sold Under Agreements to Repurchase - Schedule of Securities Sold Under Agreements to Repurchase and Securities Pledged (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
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	$ 200,050	$ 216,094

Noninterest Income and Expens47

Noninterest Income and Expense - Summary of Noninterest Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Noninterest income
Service charges on deposit accounts	$ 2,674	$ 2,435	$ 5,346	$ 4,857
Trust fees	1,039	917	2,060	1,797
Mortgage banking fees	1,336	1,272	2,738	2,824
Brokerage commissions and fees	461	351	820	728
Marine finance fees	446	326	1,019	460
Interchange income	3,076	2,785	6,018	5,419
BOLI income	1,066	757	2,122	1,490
Other income	2,671	1,624	5,044	2,797
Noninterest income, gross	12,769	10,467	25,167	20,372
Securities (losses)/gains, net	(48)	21	(150)	21
TOTAL NONINTEREST INCOME (Note H)	12,721	10,488	25,017	20,393
Noninterest expense
Salaries and wages	16,429	18,375	31,810	33,744
Employee benefits	3,034	2,935	6,115	6,003
Outsourced data processing costs	3,393	3,456	7,072	6,725
Telephone/data lines	643	648	1,255	1,180
Occupancy	3,316	4,421	6,433	7,578
Furniture and equipment	1,468	1,679	2,925	3,070
Marketing	1,344	1,074	2,596	1,996
Legal and professional fees	2,301	3,276	4,274	5,408
FDIC assessments	595	650	1,193	1,220
Amortization of intangibles	1,004	839	1,993	1,558
Net losses and disposition expense on other real estate owned	405	297	597	4
Other	4,314	3,975	9,147	7,885
Total	$ 38,246	$ 41,625	$ 75,410	$ 76,371

Equity Capital - Additional Inf

Equity Capital - Additional Information (Details)	Jun. 30, 2018
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	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities	$ 954,906	$ 949,460
Loans held for sale	14,707	24,306
Other real estate owned	8,417	7,640
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities	954,906	949,460
Loans held for sale	14,707	24,306
Equity securities	6,193	6,344
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	6,193	6,344
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	954,806	949,360
Loans held for sale	14,707	24,306
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	11,525	4,192
Other real estate owned	8,417	7,640
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	2,822	3,454
Other real estate owned	3,766	60
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	8,703	738
Other real estate owned	$ 4,651	$ 7,580

Fair Value - Aggregate Fair Val

Fair Value - Aggregate Fair Value and Contractual Balance of Loans for Sale (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Aggregate fair value	$ 14,707	$ 24,306
Contractual balance	14,296	23,627
Excess	$ 411	$ 679

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Average capitalization rate	7.60%	7.60%
Specific reserve for impaired loans	$ 28,924	$ 28,924	$ 28,118	$ 27,122	$ 26,000	$ 24,562	$ 23,400
Additions		8,100
Paydowns and chargeoffs		200
Additions to level 3 from foreclosed loans		300
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired loans	11,500	11,500		4,200
Specific reserve for impaired loans	2,100	2,100		$ 2,400
Increase to level 3 from migrated branches taken out of service	$ 2,000
Reductions related to sale of loans		$ 5,300

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	Jun. 30, 2018	Dec. 31, 2017
Financial Assets
Debt securities held to maturity	$ 382,137	$ 416,863
Loans, net	3,945,092	3,790,255
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	370,787	414,470
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	61,654	61,530
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Financial Assets
Debt securities held to maturity	0	0
Time deposits with other banks	10,427	12,493
Loans, net	3,916,436	3,760,754
Financial Liabilities
Deposit liabilities	4,692,308	4,588,515
Federal Home Loan Bank (FHLB) borrowings	204,980	211,000
Subordinated debt	0	0
Carrying Value | Fair Value, Measurements, Recurring
Financial Assets
Debt securities held to maturity	382,137	416,863
Time deposits with other banks	10,562	12,553
Loans, net	3,933,567	3,786,063
Financial Liabilities
Deposit liabilities	4,697,440	4,592,720
Federal Home Loan Bank (FHLB) borrowings	205,000	211,000
Subordinated debt	$ 70,664	$ 70,521

Business Combinations - Additio

Business Combinations - Additional Information (Details) $ / shares in Units, $ in Thousands	Jun. 11, 2018branch	Nov. 03, 2017USD ($)$ / shares	Nov. 03, 2017USD ($)branch$ / shares	Oct. 20, 2017USD ($)branch$ / shares	Apr. 07, 2017USD ($)$ / shares	Apr. 07, 2017USD ($)branch$ / shares	Feb. 28, 2018branch	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Deposits								$ 4,697,440		$ 4,592,720
Loans, net								$ 3,945,092		$ 3,790,255
Gulf Shore Banc shares Inc
Business Acquisition [Line Items]
Number of branches acquired | branch						3
Other assets acquired					$ 358,000	$ 358,000
Loans acquired					251,000	251,000
Deposits acquired					$ 285,000	$ 285,000
Percentage of common stock acquired					100.00%	100.00%
Cash portion, cash per share for common stock converted (in dollars per share) | $ / shares						$ 1.47
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)						0.4807
Multiplied by common stock price per share (in dollars per share) | $ / shares					$ 23.94	$ 23.94
Goodwill recognized from acquisition, nondeductible					$ 37,100
NorthStar Bank
Business Acquisition [Line Items]
Number of branches acquired | branch				3
Other assets acquired				$ 216,000
Loans acquired				137,000
Deposits acquired				$ 182,000
Percentage of common stock acquired				100.00%
Cash portion, cash per share for common stock converted (in dollars per share) | $ / shares				$ 2.40
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)				0.5605
Multiplied by common stock price per share (in dollars per share) | $ / shares				$ 24.92
Goodwill recognized from acquisition, nondeductible				$ 12,300
Palm Beach Community Bank
Business Acquisition [Line Items]
Number of branches acquired | branch							2
Other assets acquired		$ 357,000	$ 357,000
Loans acquired		270,000	270,000
Deposits acquired		$ 269,000	$ 269,000
Percentage of common stock acquired		100.00%	100.00%
Cash portion, cash per share for common stock converted (in dollars per share) | $ / shares			$ 6.26
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)			0.924
Multiplied by common stock price per share (in dollars per share) | $ / shares		$ 24.31	$ 24.31
Goodwill recognized from acquisition, nondeductible		$ 34,800
Palm Beach Community Bank
Business Acquisition [Line Items]
Number of branches operated | branch			4
First Green Bancorp, Inc.
Business Acquisition [Line Items]
Number of branches operated | branch	7
Deposits									$ 629,000
Loans, net									$ 629,000

Business Combinations - Purchas

Business Combinations - Purchase Price (Details) $ / shares in Units, $ in Thousands	Nov. 03, 2017USD ($)$ / sharesshares	Oct. 20, 2017USD ($)$ / sharesshares	Apr. 07, 2017USD ($)$ / sharesshares
Gulf Shore Banc shares Inc
Business Acquisition [Line Items]
Value of shares exchanged for cash			$ 8,034
Number of shares outstanding (in shares) | shares			5,464
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)			0.4807
Number of shares of Seacoast common stock issued (in shares) | shares			2,627
Multiplied by common stock price per share (in dollars per share) | $ / shares			$ 23.94
Value of common stock issued			$ 62,883
Total purchase price			$ 70,917
NorthStar Bank
Business Acquisition [Line Items]
Value of shares exchanged for cash		$ 4,701
Number of shares outstanding (in shares) | shares		1,958
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)		0.5605
Number of shares of Seacoast common stock issued (in shares) | shares		1,098
Multiplied by common stock price per share (in dollars per share) | $ / shares		$ 24.92
Value of common stock issued		$ 27,353
Cash paid for NorthStar Banking vested Corporation stock options		801
Total purchase price		$ 32,855
Palm Beach Community Bank
Business Acquisition [Line Items]
Value of shares exchanged for cash	$ 15,694
Number of shares outstanding (in shares) | shares	2,507
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)	0.924
Number of shares of Seacoast common stock issued (in shares) | shares	2,316
Multiplied by common stock price per share (in dollars per share) | $ / shares	$ 24.31
Value of common stock issued	$ 56,312
Total purchase price	$ 72,006

Business Combinations - Fair Va

Business Combinations - Fair Value of the Assets Purchased, Including Goodwill, and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Nov. 03, 2017	Oct. 20, 2017	Apr. 07, 2017
Assets:
Goodwill	$ 148,555	$ 147,578
Gulf Shore Banc shares Inc
Assets:
Other assets					$ 358,000
Gulf Shore Banc shares Inc | Measurement Period Adjustments
Assets:
Cash					0
Investment securities					0
Loans, net					0
Fixed assets					0
Other real estate owned					0
Core deposit intangibles					0
Goodwill					0
Other assets					0
Total assets acquired					0
Liabilities:
Deposits					0
Other liabilities					0
Total liabilities assumed					0
Gulf Shore Banc shares Inc | Initially Reported
Assets:
Cash					55,540
Investment securities					316
Loans, net					250,876
Fixed assets					1,307
Other real estate owned					13
Core deposit intangibles					3,927
Goodwill					37,098
Other assets					8,572
Total assets acquired					357,649
Liabilities:
Deposits					285,350
Other liabilities					1,382
Total liabilities assumed					286,732
Gulf Shore Banc shares Inc | As Adjusted
Assets:
Cash					55,540
Investment securities					316
Loans, net					250,876
Fixed assets					1,307
Other real estate owned					13
Core deposit intangibles					3,927
Goodwill					37,098
Other assets					8,572
Total assets acquired					357,649
Liabilities:
Deposits					285,350
Other liabilities					1,382
Total liabilities assumed					$ 286,732
NorthStar Bank
Assets:
Other assets				$ 216,000
NorthStar Bank | Measurement Period Adjustments
Assets:
Cash				0
Investment securities				0
Loans, net				0
Fixed assets				0
Core deposit intangibles				0
Goodwill				(99)
Other assets				99
Total assets acquired				0
Liabilities:
Deposits				0
Other liabilities				0
Total liabilities assumed				0
NorthStar Bank | Initially Reported
Assets:
Cash				5,485
Investment securities				56,123
Loans, net				136,832
Fixed assets				2,637
Core deposit intangibles				1,275
Goodwill				12,404
Other assets				1,522
Total assets acquired				216,278
Liabilities:
Deposits				182,443
Other liabilities				980
Total liabilities assumed				183,423
NorthStar Bank | As Adjusted
Assets:
Cash				5,485
Investment securities				56,123
Loans, net				136,832
Fixed assets				2,637
Core deposit intangibles				1,275
Goodwill				12,305
Other assets				1,621
Total assets acquired				216,278
Liabilities:
Deposits				182,443
Other liabilities				980
Total liabilities assumed				$ 183,423
Palm Beach Community Bank
Assets:
Other assets			$ 357,000
Palm Beach Community Bank | Measurement Period Adjustments
Assets:
Cash			0
Investment securities			0
Loans, net			(1,772)
Fixed assets			0
Core deposit intangibles			0
Goodwill			1,323
Other assets			449
Total assets acquired			0
Liabilities:
Deposits			0
Other liabilities			0
Total liabilities assumed			0
Palm Beach Community Bank | Initially Reported
Assets:
Cash			9,301
Investment securities			22,098
Loans, net			272,090
Fixed assets			7,641
Core deposit intangibles			2,523
Goodwill			33,428
Other assets			9,909
Total assets acquired			356,990
Liabilities:
Deposits			268,633
Other liabilities			16,351
Total liabilities assumed			284,984
Palm Beach Community Bank | As Adjusted
Assets:
Cash			9,301
Investment securities			22,098
Loans, net			270,318
Fixed assets			7,641
Core deposit intangibles			2,523
Goodwill			34,751
Other assets			10,358
Total assets acquired			356,990
Liabilities:
Deposits			268,633
Other liabilities			16,351
Total liabilities assumed			$ 284,984

Business Combinations - Fair 56

Business Combinations - Fair Value of Acquired Loans (Details) - USD ($) $ in Thousands	Nov. 03, 2017	Oct. 20, 2017	Apr. 07, 2017
Gulf Shore Banc shares Inc
Business Acquisition [Line Items]
Book Balance			$ 256,876
Fair Value			250,876
Gulf Shore Banc shares Inc | Commercial real estate
Business Acquisition [Line Items]
Book Balance			106,729
Fair Value			103,905
Gulf Shore Banc shares Inc | Commercial loans
Business Acquisition [Line Items]
Book Balance			32,137
Fair Value			32,247
Gulf Shore Banc shares Inc | Single family residential real estate
Business Acquisition [Line Items]
Book Balance			101,281
Fair Value			99,598
Gulf Shore Banc shares Inc | Construction/development/land
Business Acquisition [Line Items]
Book Balance			13,175
Fair Value			11,653
Gulf Shore Banc shares Inc | Consumer and other loans
Business Acquisition [Line Items]
Book Balance			3,554
Fair Value			3,473
Gulf Shore Banc shares Inc | Purchased credit-impaired
Business Acquisition [Line Items]
Book Balance			0
Fair Value			$ 0
NorthStar Bank
Business Acquisition [Line Items]
Book Balance		$ 143,444
Fair Value		136,832
NorthStar Bank | Commercial real estate
Business Acquisition [Line Items]
Book Balance		73,139
Fair Value		69,554
NorthStar Bank | Commercial loans
Business Acquisition [Line Items]
Book Balance		31,200
Fair Value		30,854
NorthStar Bank | Single family residential real estate
Business Acquisition [Line Items]
Book Balance		15,111
Fair Value		15,096
NorthStar Bank | Construction/development/land
Business Acquisition [Line Items]
Book Balance		11,706
Fair Value		10,390
NorthStar Bank | Consumer and other loans
Business Acquisition [Line Items]
Book Balance		6,761
Fair Value		6,645
NorthStar Bank | Purchased credit-impaired
Business Acquisition [Line Items]
Book Balance		5,527
Fair Value		$ 4,293
Palm Beach Community Bank
Business Acquisition [Line Items]
Book Balance	$ 275,567
Fair Value	270,318
Palm Beach Community Bank | Commercial real estate
Business Acquisition [Line Items]
Book Balance	134,705
Fair Value	132,089
Palm Beach Community Bank | Commercial loans
Business Acquisition [Line Items]
Book Balance	36,076
Fair Value	35,876
Palm Beach Community Bank | Single family residential real estate
Business Acquisition [Line Items]
Book Balance	30,153
Fair Value	30,990
Palm Beach Community Bank | Construction/development/land
Business Acquisition [Line Items]
Book Balance	69,686
Fair Value	67,425
Palm Beach Community Bank | Consumer and other loans
Business Acquisition [Line Items]
Book Balance	179
Fair Value	172
Palm Beach Community Bank | Purchased credit-impaired
Business Acquisition [Line Items]
Book Balance	4,768
Fair Value	$ 3,766

Business Combinations - Purch57

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

Business Combinations - Pro-For

Business Combinations - Pro-Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Business Combinations [Abstract]
Net interest income	$ 45,987	$ 96
Net income	$ 11,285	$ 21
EPS - basic (in dollars per share)	$ 0.25	$ 0.46
EPS - diluted (in dollars per share)	$ 0.25	$ 0.45