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Intangible Assets - FV Assumptions (Details) - Mortgage servicing rights (MSRs)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Assumptions used in estimating the fair value of mortgage service rights    
Weighted average constant prepayment rate 15.74% 13.42%
Weighted average note rate 3.55% 3.93%
Weighted average discount rate 7.75% 8.61%
Weighted average expected life (in years) 4 years 9 months 18 days 4 years 9 months 18 days