Quarterly report [Sections 13 or 15(d)]

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

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Borrowings and Subordinated Debentures - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Federal Home Loan Banks [Abstract]    
Weighted-average interest rate at end of period 0.00% 4.02%
Weighted-average interest rate during the period 3.94% 4.52%
Average balance of FHLB advances $ 68,944,000 $ 82,390,000
Maximum amount outstanding at any month-end $ 90,000,000 $ 150,000,000