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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Other Investments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
LIHTC
Investments	$ 188,786,000		$ 188,786,000		$ 186,369,000
Estimated tax credits	8,141,000	$ 5,633,000	24,423,000	$ 16,899,000
Estimated amortization	6,542,000	$ 6,219,000	19,626,000	18,655,000
Impairment losses			0	$ 0
Other liabilities
LIHTC
Unfunded commitments	$ 32,562,000		$ 32,562,000		$ 25,064,000

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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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