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Servicing Assets and Liabilities - Key characteristics, inputs, and economic assumptions for SBA/USDA loans and related sensitivity (Details) - SBA/USDA - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]        
Fair value of retained servicing assets $ 6,794 $ 7,510 $ 7,740 $ 5,752
Prepayment rate assumption (percent) 16.50% 12.10%    
10% adverse change $ (352) $ (267)    
20% adverse change $ (671) $ (515)    
Discount rate (percent) 12.30% 14.50%    
100 bps adverse change $ (184) $ (196)    
200 bps adverse change $ (358) $ (381)    
Weighted-average life (years) 3 years 10 months 24 days 5 years    
Weighted-average gross margin (percent) 1.90% 1.90%