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Intangible Assets - FV Assumptions (Details) - Mortgage servicing rights (MSRs)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Assumptions used in estimating the fair value of mortgage service rights    
Weighted average constant prepayment rate 13.42% 8.87%
Weighted average note rate 3.93% 3.95%
Weighted average discount rate 8.61% 10.28%
Weighted average expected life (in years) 4 years 9 months 18 days 6 years 3 months 18 days