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Mortgage Servicing Rights - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Servicing Asset at Amortized Cost [Line Items]                
Mortgage Loans Serviced By For Third Parties $ 4,300,000   $ 4,300,000     $ 4,700,000    
Fair value of MSRs 32,900   32,900     28,200    
Residential Mortgage                
Servicing Asset at Amortized Cost [Line Items]                
Reduction (addition) to valuation allowance (3,500) $ 1,500 (7,400) $ 9,200        
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance $ 3,100 $ 9,200 $ 3,100 $ 9,200 $ 6,600 $ 10,500 $ 7,700 $ 0