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Fair Value - Summary of Financial Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale $ 314,784 $ 321,081 [1]
Total securities available for sale 314,784 321,081
U.S. Treasury and Agencies [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 71,453 68,871
State and Municipal [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 44,529 43,325
Corporate Bonds [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 33,366 31,915
Level 2 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 314,034 320,331
Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 750 750
Fair Value, Recurring [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total securities available for sale 314,784 321,081
Mortgage servicing rights assets 19,502 27,114
Rabbi trust assets 593 531
Mortgage derivative asset 212 335
Interest rate swap asset 69 71
Mortgage derivative liability   140
Interest rate swap liability 71 71
Fair Value, Recurring [Member] | Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 165,436 176,970
Fair Value, Recurring [Member] | U.S. Treasury and Agencies [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 71,453 68,871
Fair Value, Recurring [Member] | State and Municipal [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 44,529 43,325
Fair Value, Recurring [Member] | Corporate Bonds [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 33,366 31,915
Fair Value, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Rabbi trust assets 593 531
Fair Value, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total securities available for sale 314,034 320,331
Mortgage derivative asset 212 335
Interest rate swap asset 69 71
Mortgage derivative liability   140
Interest rate swap liability 71 71
Fair Value, Recurring [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 165,436 176,970
Fair Value, Recurring [Member] | Level 2 [Member] | U.S. Treasury and Agencies [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 71,453 68,871
Fair Value, Recurring [Member] | Level 2 [Member] | State and Municipal [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 44,529 43,325
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Bonds [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 32,616 31,165
Fair Value, Recurring [Member] | Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total securities available for sale 750 750
Mortgage servicing rights assets 19,502 27,114
Fair Value, Recurring [Member] | Level 3 [Member] | Corporate Bonds [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale $ 750 $ 750
[1] Derived from audited December 31, 2023 Consolidated Financial Statements.