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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Contractual amount of off-balance-sheet financial instruments    
Total contractual amount of off-balance-sheet financial instruments $ 244,140 $ 258,746
Commitments to extend credit    
Contractual amount of off-balance-sheet financial instruments    
Total contractual amount of off-balance-sheet financial instruments 212,420 253,375
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 2,597 2,626
Standby letters of credit    
Contractual amount of off-balance-sheet financial instruments    
Total contractual amount of off-balance-sheet financial instruments $ 29,123 $ 2,745