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Variable Interest Entities (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Variable Interest Entities      
Impairment losses $ 0 $ 0  
Other assets      
Variable Interest Entities      
Carrying value of equity investments in LIHTCs $ 43,730,000   $ 41,521,000
CDE      
Variable Interest Entities      
Tax credit period 7 years    
LIHTC      
Variable Interest Entities      
Tax credit period 10 years    
Tax credit compliance period 15 years