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Fair Value - Additional Information (Details) - USD ($)
 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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Allowance for credit losses $ 107,868,000 $ 131,388,000 $ 107,868,000 $ 131,388,000 $ 109,444,000 $ 131,388,000 $ 128,394,000 $ 54,619,000
Provision expense for (recoveries from) credit losses (4,613,000) 0 (26,898,000) 39,495,000        
Other real estate owned property write-downs 0 63,000 23,000 161,000        
Valuation allowance for loan servicing rights with impairments 100,000 2,348,000 100,000 2,348,000 $ 105,000 1,407,000 $ 2,253,000 $ 31,000
Valuation allowance for loan servicing rights with impairments, impairments (recoveries) during period (5,000) 95,000 $ (1,307,000) 2,317,000        
Past due period of mortgage loans held for sale     90 days          
Interest income for residential loans held for sale 400,000 600,000 $ 1,100,000 1,500,000        
Impaired Commercial and Commercial Real Estate Loans                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Principal amount of impaired commercial and commercial real estate loans 32,000,000   32,000,000     57,200,000    
Allowance for credit losses 4,400,000   4,400,000     $ 5,800,000    
Provision expense for (recoveries from) credit losses $ 100,000 $ (5,000,000) $ 100,000 $ 1,500,000