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Commitments and Contingencies - Narrative (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Rental expense under leases for equipment and premises $ 2,900,000 $ 2,900,000 $ 2,800,000
Rental income under leases $ 692,000 532,000 $ 424,000
Limit on stop-loss insurance 1 year    
Stop-loss insurance limit per covered individual per year $ 175,000    
Loans repurchased in 2 year interval | loan 1    
Total unfunded commitments $ 308,800,000 335,100,000  
Reserve for unfunded loan commitments and letters of credit $ 130,000 $ 152,000