Annual report [Section 13 and 15(d), not S-K Item 405]

Borrowings - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail)

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Borrowings - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Federal Home Loan Banks [Abstract]      
Weighted-average interest rate at end of year 4.02% 4.75% 4.69%
Weighted-average interest rate during the year 4.52% 4.37% 3.48%
Average balance of FHLB advances $ 82,390,000 $ 154,112,000 $ 197,390,000
Maximum amount outstanding at any month-end $ 150,000,000 $ 350,000,000 $ 450,000,000