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Minimum Regulatory Capital Requirements - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 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			$ 4.1	$ 2.0
CECL Adjustment to Regulatory Capital [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Adjustment to regulatory capital				25.00%
CECL Adjustment to Regulatory Capital [Member] | Forecast [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Adjustment to regulatory capital	25.00%	50.00%
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

Adjustment to regulatory capital

+ References

No definition available.

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- Definition

Banking regulation capital transitional amount.

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- Definition

Risk weighted assets capital conservation buffer.

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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

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-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

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