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Fair Value of Financial Instruments - Changes in the Level 3 Fair Value Category of Unobservable Inputs (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
State and Local Governments Tax-Exempt [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ 184 $ 1,831 $ 353 $ 2,071
Change in Fair Value 1   2 5
Payments, Maturities & Calls   (657) (170) (902)
Ending Balance 185 1,174 185 1,174
State and Local Governments Taxable[Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 1,270 1,278 1,274 1,274
Change in Fair Value 3 (25) (1) (21)
Ending Balance 1,273 1,253 1,273 1,253
State and Local Governments [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 1,454 3,109 1,627 3,345
Change in Fair Value 4 (25) 1 (16)
Payments, Maturities & Calls   (657) (170) (902)
Ending Balance $ 1,458 $ 2,427 $ 1,458 $ 2,427