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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Investment Program, Proportional Amortization Method, Elected [Line Items]
Investments for qualified affordable housing projects included in other assets	$ 14,499,000		$ 14,499,000		$ 15,122,000
Unfunded commitments related to the investments in qualified affordable housing projects	4,741,000		4,741,000		$ 5,722,000
Recognized amortization expense	319,000	$ 252,000	623,000	$ 427,000
Recognized tax credits and other benefits from its investments in affordable housing tax credits	461,000	428,000	921,000	857,000
Impairment losses related to its investments in qualified affordable housing projects	$ 0	$ 0	$ 0	$ 0

X

- Definition

Amount of impairment loss for investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method.

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Amount, before amortization expense, of income tax credit and other tax benefit generated by investment under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method.

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Amount of investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under program not meeting condition for accounting under proportional amortization method.

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Amount of commitment and contingent commitment, including amount of delayed equity contribution, for investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, commitment and contingent commitment related to investment under tax credit program not meeting condition for accounting under proportional amortization method.

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