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Intangible Assets - FV Assumptions (Details) - Mortgage servicing rights (MSRs)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Assumptions used in estimating the fair value of mortgage service rights    
Weighted average constant prepayment rate 15.18% 9.47%
Weighted average note rate 3.91% 3.96%
Weighted average discount rate 8.25% 9.77%
Weighted average expected life (in years) 4 years 4 months 24 days 6 years