XML 68 R57.htm IDEA: XBRL DOCUMENT v3.21.1
Mortgage Servicing Rights - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Servicing Asset at Amortized Cost [Line Items]        
Mortgage Loans Serviced By For Third Parties $ 4,600,000   $ 4,700,000  
Fair value of MSRs 33,400   28,200  
Residential Mortgage        
Servicing Asset at Amortized Cost [Line Items]        
Reduction (addition) to valuation allowance (6,100) $ 1,100    
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance $ 4,400 $ 1,100 $ 10,500 $ 0