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Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Servicing Asset [Abstract]      
Mortgage Loans Serviced By For Third Parties $ 4,800,000   $ 4,900,000
Fair value of MSRs 37,800   $ 45,200
Residential Mortgage      
Amortized Cost:      
Balance at beginning of period 39,267 $ 38,573  
Originations of MSRs 1,478 1,225  
Amortization (1,891) (1,294)  
Balance at end of period 38,854 38,504  
Servicing Asset [Abstract]      
Beginning balance 0 0  
Additions to valuation allowance 1,100 0  
Ending balance 1,100 0  
Net MSRs at end of period $ 37,754 $ 38,504