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Commitments and Contingencies - Contractual Amounts (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Contractual amount of off-balance-sheet financial instruments    
Total contractual amount of off-balance-sheet financial instruments $ 371,327 $ 351,968
Commitments to extend credit    
Contractual amount of off-balance-sheet financial instruments    
Total contractual amount of off-balance-sheet financial instruments 254,735 267,314
Commitments to originate residential first and second mortgage loans    
Contractual amount of off-balance-sheet financial instruments    
Total contractual amount of off-balance-sheet financial instruments 4,356 1,759
Standby letters of credit    
Contractual amount of off-balance-sheet financial instruments    
Total contractual amount of off-balance-sheet financial instruments $ 112,236 $ 82,895