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Loans and Asset Quality - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]        
Interest income on impaired loans $ 91,000 $ 172,000    
Increase for allowance for loan losses 14,393,000   $ 13,937,000 $ 12,524,000
Defaults on loans 0 0    
Short-term loan modification of HFI investments not considered TDR 113,400,000      
Unfunded Loan Commitment        
Loans and Leases Receivable Disclosure [Line Items]        
Other commitments 270,500,000   257,000,000.0  
Standby Letters of Credit        
Loans and Leases Receivable Disclosure [Line Items]        
Other commitments 10,100,000   $ 11,100,000  
TDRs        
Loans and Leases Receivable Disclosure [Line Items]        
Increase for allowance for loan losses $ 0 $ 0