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Fair Value of Assets and Liabilities - Additional Information (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Allowance for credit losses $ 72,925,000 $ 68,774,000 $ 70,182,000 $ 71,160,000 $ 68,312,000 $ 68,675,000
Other real estate owned 1,463,000   2,179,000      
Mortgage Servicing Rights            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Finite-lived intangible assets, net 4,823,000 5,835,000 5,629,000     $ 6,859,000
Mortgage servicing rights (MSR) impairment (recovery) 1,000 $ (77,000) $ 7,000      
Fair Value, Nonrecurring            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Carrying amount of loans with a specific allowance 5,800,000          
Fair value of loans with a specific allowance 5,400,000          
Allowance for credit losses 412,000          
Fair Value, Nonrecurring | Carrying Amount            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Other real estate owned 1,500,000          
Fair Value, Nonrecurring | Fair Value            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Other real estate owned $ 948,000