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Fair Value - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Allowance for credit losses $ 303,982,000 $ 302,254,000 $ 303,982,000 $ 302,254,000 $ 300,555,000 $ 303,671,000 $ 288,003,000 $ 107,341,000
Provision for credit losses 19,068,000 15,490,000 47,292,000 133,391,000        
Other real estate owned property write-downs 26,000 200,000 100,000 600,000        
Valuation allowance for loan servicing rights with impairments 0   0          
Valuation allowance for loan servicing rights with impairments, impairments (recoveries) during period 0 0 $ 0 0        
Past due period of mortgage loans held for sale     90 days          
Interest income for residential loans held for sale 400,000 400,000 $ 900,000 1,600,000        
Fair Value on Non-recurring Basis                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Other real estate 1,900,000   1,900,000          
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 117,500,000   117,500,000     92,000,000    
Allowance for credit losses 31,000,000   31,000,000     $ 21,500,000    
Provision for credit losses $ 2,100,000 $ 7,300,000 $ 21,900,000 $ 20,100,000