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Fair Value - Summary of Financial Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale $ 325,401 $ 312,035 [1]
Total securities available for sale 325,401 312,035
U.S. Treasury and Agencies [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 70,616 69,455
State and Municipal [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 43,701 42,937
Corporate Bonds [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 35,776 35,205
Level 2 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 324,651 311,285
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 325,401 312,035
Mortgage servicing rights assets 388 386
Rabbi trust assets 586 600
Mortgage derivative asset 278 140
Interest rate swap asset 73 95
Mortgage derivative liability 4  
Interest rate swap liability 73 95
Fair Value, Recurring [Member] | Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 175,308 164,438
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 70,616 69,455
Fair Value, Recurring [Member] | State and Municipal [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 43,701 42,937
Fair Value, Recurring [Member] | Corporate Bonds [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Securities available for sale 35,776 35,205
Fair Value, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Rabbi trust assets 586 600
Fair Value, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total securities available for sale 324,651 311,285
Mortgage derivative asset 278 140
Interest rate swap asset 73 95
Mortgage derivative liability 4  
Interest rate swap liability 73 95
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 175,308 164,438
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 70,616 69,455
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 43,701 42,937
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 35,026 34,455
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 388 386
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, 2024 Consolidated Financial Statements.