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Servicing Assets and Liabilities - Key characteristics, inputs, and economic assumptions for residential mortgage loans and related sensitivity (Details) - Residential mortgage servicing rights - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Servicing Assets at Fair Value [Line Items]        
Fair value of retained servicing assets $ 25,161 $ 16,216 $ 13,565 $ 11,877
10% adverse change (1,229) (999)    
20% adverse change (2,367) (1,912)    
100 bps adverse change (877) (518)    
200 bps adverse change $ (1,693) $ (1,001)    
Weighted average        
Servicing Assets at Fair Value [Line Items]        
Prepayment rate assumption 12.60% 17.70%    
Discount rate 9.50% 10.00%    
Minimum        
Servicing Assets at Fair Value [Line Items]        
Prepayment rate assumption 7.00% 8.70%    
Discount rate 9.50% 10.00%    
Maximum        
Servicing Assets at Fair Value [Line Items]        
Prepayment rate assumption 77.60% 19.50%    
Discount rate 10.50% 11.00%