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Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Servicing Asset [Abstract]          
Mortgage Loans Serviced By For Third Parties $ 4,800,000   $ 4,800,000   $ 4,900,000
Fair value of MSRs 31,000   31,000   $ 45,200
Residential Mortgage          
Amortized Cost:          
Balance at beginning of period 38,854 $ 38,504 39,267 $ 38,573  
Originations of MSRs 2,772 1,861 4,250 3,086  
Amortization (2,934) (1,539) (4,825) (2,833)  
Balance at end of period 38,692 38,826 38,692 38,826  
Servicing Asset [Abstract]          
Beginning balance 1,100 0 0 0  
Additions to valuation allowance 6,600 0 7,700 0  
Ending balance 7,700 0 7,700 0  
Net MSRs at end of period 30,992 38,826 30,992 38,826  
Fair value of MSRs $ 30,992 $ 44,916 $ 30,992 $ 44,916