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Intangible Assets - FV Assumptions (Details) - Mortgage servicing rights (MSRs)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Assumptions used in estimating the fair value of mortgage service rights    
Weighted average constant prepayment rate 9.47% 9.07%
Weighted average note rate 3.96% 3.87%
Weighted average discount rate 9.77% 10.39%
Weighted average expected life (in years) 6 years 6 years 2 months 12 days