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Acquisitions & Divestitures - Summary of Balance Sheet Amounts Relative to Branches Sold (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nov. 12, 2020
Mar. 08, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Cash, Cash Equivalents, and Federal Funds Sold $ 537,703       $ 167,256       $ 537,703 $ 167,256      
Loans and Leases Receivable, Net Amount 7,088,264       5,271,049       7,088,264 5,271,049      
Fixed assets, net 53,169       60,013       53,169 60,013      
Accrued interest receivable 31,100               31,100        
Goodwill 260,567       210,344       260,567 210,344 $ 117,345    
Intangible assets, net 23,084       26,076       23,084 26,076      
Deposits 7,985,389       5,771,023       7,985,389 5,771,023      
Other borrowings 271,081       230,886       271,081 230,886      
Investments trust preferred securities 2,900               2,900        
Other liabilities 132,489       66,747       132,489 66,747      
Net income 28,931 $ 17,951 $ 14,634 $ 12,868 $ 29,090 $ 29,069 $ 18,424 $ 16,156 74,384 92,739 $ 89,217    
Seacoast Commerce Banc Holding [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Goodwill $ 50,223               50,223     $ 35,395  
Business Acquisition, Pro Forma Revenue                 381,914 355,500      
Business Acquisition, Pro Forma Net Income (Loss)                 $ 93,918 $ 86,888      
Business Acquisition, Pro Forma Earnings Per Share, Diluted                 $ 3.00 $ 2.79      
Adjustments associated with acquisition [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Cash, Cash Equivalents, and Federal Funds Sold                         $ 0
Loans and Leases Receivable, Net Amount                         (20,743)
Other Real Estate                         (2,059)
Other Investments                         0
Fixed assets, net                         (300)
Accrued interest receivable                         0
Intangible assets, net                         23,066
Deferred Tax Assets, State Taxes                         (2,386)
Other assets                         (1,484)
Total assets acquired                         (4,525)
Deposits                         36
Accrued interest payable                         0
Other liabilities                         (827)
Total Liabilities Assumed                         (4,592)
Net assets acquired (assumed)                         $ 67