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Investments in Qualified Affordable Housing Projects Investments in Qualified Affordable Housing Projects - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Sep. 30, 2017
Jul. 01, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Carrying value of qualified affordable housing project investments   $ 8,359,000   $ 6,331,000
Funding obligation related to qualified affordable housing projects $ 2,450,000      
Funding obligation related to qualified affordable housing projects $ 0      
Metropolitan Bancgroup, Inc.        
Schedule of Equity Method Investments [Line Items]        
Carrying value of qualified affordable housing project investments     $ 5,469,000