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Loans - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
contract
Jun. 30, 2019
USD ($)
contract
Jun. 30, 2020
USD ($)
contract
Jun. 30, 2019
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
Mar. 13, 2020
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net deferred costs         $ 19,900,000  
Accrued interest receivable $ 25,300,000   $ 25,300,000   $ 14,900,000  
Interest income from securities with no related allowance 300,000 $ 300,000        
Allowance for credit loss on TDRs $ 400,000 $ 0 $ 400,000 $ 0    
Number of loans under trouble debt restructuring | contract 3 2 8 4 3  
Value of loans under trouble debt restructuring $ 59,000 $ 370,000 $ 541,000 $ 2,365,000 $ 1,400,000  
Interest income related to impaired loans with impairment measured on present value of expected future cash flows 21,000 $ 27,000 46,000 $ 62,000    
Portfolio Loans            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net deferred costs 21,500,000   21,500,000      
Portfolio Loans | Paycheck Protection Program            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net deferred fees $ 13,000,000.0   13,000,000.0      
First Bank of the Palm Beaches            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans acquired in acquisition           $ 146,777,000
Loans | Bank Shares, Inc            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Remaining fair value adjustment for loans acquired     $ 28,900,000   $ 34,900,000  
Percentage of fair value adjustment for loans acquired 3.30%   3.30%   3.80%  
PCD Loans | First Bank of the Palm Beaches            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans acquired in acquisition $ 43,000,000.0   $ 43,000,000.0     $ 43,038,000
PCD Loans | Loans | Bank Shares, Inc            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Remaining fair value adjustment for loans acquired     1,000,000.0      
Non-PCD Loans | First Bank of the Palm Beaches            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans acquired in acquisition $ 103,800,000   103,800,000      
Non-PCD Loans | Loans | Bank Shares, Inc            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Remaining fair value adjustment for loans acquired     $ 27,900,000