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Minimum Regulatory Capital Requirements - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2025 | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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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% |  |

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- Definition Banking regulation capital transitional amount. + References No definition available. + Details
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- Definition Minimum capital conservation buffer percentage required to avoid restriction on payout amount of eligible retained income as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 + Details
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- Definition Minimum leverage buffer percentage as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 + Details
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