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Investments in Qualified Affordable Housing Projects (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jul. 01, 2017
Schedule of Equity Method Investments [Line Items]        
Carrying value of qualified affordable housing project investments   $ 6,037,000 $ 7,637,000  
Increase (decrease) in QAHP $ (2,450,000)      
Commitment   0    
Investment amortization   1,592,000 1,714,000  
Tax credits and other benefits   (2,290,000) (2,190,000)  
Total   $ (698,000) $ (476,000)  
Metropolitan Bancgroup, Inc.        
Schedule of Equity Method Investments [Line Items]        
Carrying value of qualified affordable housing project investments       $ 5,481,000