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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Contractual amount of off-balance-sheet financial instruments    
Total contractual amount of off-balance-sheet financial instruments $ 297,469 $ 314,002
Commitments to extend credit    
Contractual amount of off-balance-sheet financial instruments    
Total contractual amount of off-balance-sheet financial instruments 233,920 238,527
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 2,217 1,471
Standby letters of credit    
Contractual amount of off-balance-sheet financial instruments    
Total contractual amount of off-balance-sheet financial instruments $ 61,332 $ 74,004