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Variable Interest Entities (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Variable Interest Entities      
Unfunded contingent commitments $ 11,362,000    
Impairment losses 0 $ 0  
Other assets      
Variable Interest Entities      
Carrying value of equity investments in LIHTCs $ 34,272,000   $ 35,112,000
CDE      
Variable Interest Entities      
Tax credit period 7 years    
LIHTC      
Variable Interest Entities      
Tax credit period 10 years    
Tax credit compliance period 15 years