Loans - Analysis of Allowance for Credit Losses (Detail) - Unfunded Loan Commitment & Letters of Credit [Member] - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
|
| ALLOWANCE FOR UNFUNDED LOAN COMMITMENTS AND LETTERS OF CREDIT | |||||
| Balance at beginning of year | $ 1,189 | $ 1,308 | $ 1,035 | $ 1,541 | $ 1,541 |
| Provision for (recovery of) credit losses - off balance sheet credit exposures | 479 | (272) | 633 | (505) | (506) |
| Balance at ending of year | $ 1,668 | $ 1,036 | $ 1,668 | $ 1,036 | $ 1,035 |