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Debt - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2019
Dec. 31, 2018
Oct. 15, 2015
Debt Instrument [Line Items]        
Federal home loan bank, advances, general debt obligations, maximum amount available, percentage of total assets (as a percent)   45.00%    
Federal home loan bank, advances, general debt obligations, collateral pledged   $ 646,100,000    
Federal home loan bank, borrowing capacity   477,200,000    
Federal home loan bank, unused borrowing capacity   386,500,000    
Unsecured Fed Funds lines of credit   71,000,000    
Unsecured Fed Funds, lines of credit, outstanding balance   0    
Principal amount of subordinated debt       $ 10,000,000
Subordinated note       $ 10,000,000
Subordinated Note        
Debt Instrument [Line Items]        
Annual interest rate (as a percent)       6.50%
Contributions of proceeds from subordinated debt $ 9,000,000      
Federal Reserve Bank        
Debt Instrument [Line Items]        
Warehouse lines of credit   156,100,000 $ 127,700,000  
Line of credit, outstanding balance   0 0  
Federal Reserve Bank        
Debt Instrument [Line Items]        
Loans pledged as collateral   $ 318,800,000 $ 265,200,000