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Fair Value of Assets and Liabilities - Additional Information (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Allowance for Credit Losses $ 68,774,000 $ 68,241,000 $ 68,675,000 $ 68,312,000 $ 58,719,000 $ 59,093,000
Other real estate owned 1,832,000   1,163,000      
Mortgage Servicing Rights            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Finite-lived intangible assets, net 5,835,000 7,224,000 6,859,000     $ 331,000
Mortgage servicing rights (MSR) impairment (recovery) (77,000) $ 0 $ (8,000)      
Fair Value, Nonrecurring            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Carrying amount of loans with a specific allowance 594,000          
Fair value of loans with a specific allowance 579,000          
Allowance for Credit Losses 15,000          
Fair Value, Nonrecurring | Carrying Amount            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Other real estate owned 1,800,000          
Fair Value, Nonrecurring | Fair Value            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Other real estate owned $ 47,000