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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Investments in Affordable Housing Projects [Abstract]
Investment for qualified affordable housing projects included in other assets	$ 13,653,000		$ 13,653,000		$ 14,149,000
Unfunded commitments related to the investments in qualified affordable housing projects	4,818,000		4,818,000		$ 5,634,000
Recognized amortization expense	252,000	$ 239,000
Recognized tax credits and other benefits from its investment in affordable housing tax credits	426,000	396,000
Impairment losses related to its investments in qualified affordable housing projects	$ 0	$ 0	$ 0	$ 0

X

- Definition

Amount of write-down from impairment of an investment in a qualified affordable housing project.

+ References

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 323
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481543/323-740-50-2

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of affordable housing tax credits and other tax benefits recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 323
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481543/323-740-50-2

+ Details

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X

- Definition

Amount of investment in qualified affordable housing projects.

+ References

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 323
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481543/323-740-50-2

+ Details

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X

- Definition

Amount of amortization expense of investment in qualified affordable housing projects.

+ References

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 323
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481543/323-740-50-2

+ Details

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- Definition

Amount of commitment or contingent commitments to qualified affordable housing project investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 323
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481543/323-740-50-2

+ Details

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