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Qualified Affordable Housing Project Investments - Additional Information (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items]      
Investment for qualified affordable housing projects $ 5,768,000   $ 986,000
Unfunded commitments related to the investments in qualified housing projects 4,572,000   $ 840,000
Amortization expense $ 218,000 $ 10,000  
Maximum      
Schedule Of Equity Method Investments [Line Items]      
Expected year in which commitments are fulfilled 2027    
Minimum      
Schedule Of Equity Method Investments [Line Items]      
Expected year in which commitments are fulfilled 2028