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Acquisitions & Divestitures - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 12, 2020
USD ($)
$ / shares
shares
Mar. 08, 2019
USD ($)
office
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Mar. 07, 2019
$ / shares
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Share Price | $ / shares $ 33.56          
Business Acquisition, Transaction Costs     $ 4,200      
Cash, Cash Equivalents, and Federal Funds Sold     537,703 $ 167,256    
Interest-earning deposits greater than 90 days     7,626 3,730    
Securities available-for-sale     912,429 1,135,317    
Loans and Leases Receivable, Net Amount     7,088,264 5,271,049    
Fixed assets, net     53,169 60,013    
Accrued interest receivable     31,100      
Intangible assets, net     23,084 26,076    
Deposits     7,985,389 5,771,023    
Subordinated debentures and notes     203,637 141,258    
Other liabilities     132,489 66,747    
Goodwill     260,567 210,344 $ 117,345  
Merger Related Expenses     4,174 17,969 1,271  
As Recorded by Acquiree [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash, Cash Equivalents, and Federal Funds Sold   $ 13,899        
Interest-earning deposits greater than 90 days   100        
Securities available-for-sale   428,715        
Loans and Leases Receivable, Net Amount   705,057        
Other Real Estate   5,284        
Other Investments   6,673        
Fixed assets, net   27,586        
Accrued interest receivable   3,997        
Intangible assets, net   0        
Deferred Tax Assets, State Taxes   10,708        
Other assets   35,045        
Total assets acquired   1,237,064        
Deposits   1,081,151        
Subordinated debentures and notes   26,806        
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   6,800        
Accrued interest payable   370        
Other liabilities   5,842        
Total Liabilities Assumed   1,120,969        
Net assets acquired (assumed)   116,095        
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        
Interest-earning deposits greater than 90 days   0        
Securities available-for-sale   (619)        
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        
Subordinated debentures and notes   (3,972)        
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   171        
Accrued interest payable   0        
Other liabilities   (827)        
Total Liabilities Assumed   (4,592)        
Net assets acquired (assumed)   $ 67        
Trinity Capital Corporation [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Banking Offices | office   6        
Business Acquisition, Share Price | $ / shares   $ 1.84        
Business Acquisition, Equity Interest Issued or Issuable Per Acquired Share   0.1972        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares   4,000,000.0        
Cash   $ 37,275        
Share Price | $ / shares           $ 43.07
Total consideration paid   209,160        
Business Acquisition, Transaction Costs     18,000   1,300  
Cash, Cash Equivalents, and Federal Funds Sold   13,899        
Business Acquisition, Pro Forma Revenue       296,677 286,076  
Business Acquisition, Pro Forma Net Income (Loss)       $ 107,626 $ 85,579  
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares       $ 4.11 $ 3.14  
Interest-earning deposits greater than 90 days   100        
Securities available-for-sale   428,096        
Loans and Leases Receivable, Net Amount   684,314        
Other Real Estate   3,225        
Other Investments   6,673        
Fixed assets, net   27,286        
Accrued interest receivable   3,997        
Intangible assets, net   23,066        
Deferred Tax Assets, State Taxes   8,322        
Other assets   33,561        
Total assets acquired   1,232,539        
Deposits   1,081,187        
Subordinated debentures and notes   22,834        
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   6,971        
Accrued interest payable   370        
Other liabilities   5,015        
Total Liabilities Assumed   1,116,377        
Net assets acquired (assumed)   116,162        
Common stock   171,885        
Goodwill   $ 92,998        
Seacoast Commerce Banc Holding [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Business Acquisition, Equity Interest Issued or Issuable Per Acquired Share 0.5061          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares 5,000,000.0          
Cash     1,630      
Total consideration paid $ 169,000   168,665      
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 | $ / shares     $ 3.00 $ 2.79    
Common stock     $ 167,035      
Goodwill $ 35,395   $ 50,223      
Core Deposits [Member] | Seacoast Commerce Banc Holding [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   10 years