Borrowings and Subordinated Debentures - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail) - USD ($) |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 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 | 3.96% | 4.52% |
| Average balance of FHLB advances | $ 41,851,000 | $ 82,390,000 |
| Maximum amount outstanding at any month-end | $ 150,000,000 |