Minimum Regulatory Capital Requirements - Additional Information (Detail) - USD ($) $ in Millions |
Dec. 31, 2025 |
Jun. 30, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|---|
| Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] | ||||
| Leverage ratio | 0.10 | |||
| Capital ratio | 0.13 | |||
| Banking regulation capital transitional amount | $ 8.1 | |||
| Banking regulation capital transitional amount substracted | $ 6.1 | $ 4.1 | ||
| CECL Adjustment to Regulatory Capital [Member] | ||||
| Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] | ||||
| Adjustment to regulatory capital | 50.00% | 25.00% | ||
| Forecast [Member] | CECL Adjustment to Regulatory Capital [Member] | ||||
| Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] | ||||
| Adjustment to regulatory capital | 25.00% | |||
| Common Equity Tier 1 Capital [Member] | ||||
| Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] | ||||
| Capital conservation buffer | 2.50% |