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Intangible Assets - FV Assumptions (Details) - Mortgage servicing rights (MSRs)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Assumptions used in estimating the fair value of mortgage service rights    
Weighted average constant prepayment rate 18.03% 11.35%
Weighted average note rate 3.81% 3.97%
Weighted average discount rate 7.75% 9.77%
Weighted average expected life (in years) 4 years 4 months 24 days 53 months 24 days