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Intangible Assets - FV Assumptions (Details) - Mortgage servicing rights (MSRs)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Assumptions used in estimating the fair value of mortgage service rights    
Weighted average constant prepayment rate 11.41% 16.89%
Weighted average note rate 3.38% 3.67%
Weighted average discount rate 8.00% 7.75%
Weighted average expected life (in years) 6 years 4 years 8 months 12 days