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Investment Securities - Other (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Jul. 31, 2024
Investment Securities
Debt Securities, available-for-sale and held-to-maturity, allowance for credit loss		$ 0		$ 0
Securities held to maturity, amortized cost		$ 7,000,000		$ 7,000,000		$ 7,000,000	$ 2,000,000
Available-for-sale, securities in unrealized loss positions, depreciation from amortized cost percentage		7.20%		7.20%
Held-to-maturity, securities in unrealized loss positions, depreciation from amortized cost percentage		23.80%		23.80%
Proceeds from sales of securities available for sale			$ 0	$ 17,911,000	$ 19,189,000
Debt securities, available-for-sale, realized gain		$ 21,000		53,000	133,000
Debt securities, available-for-sale, realized loss		60,000		147,000	101,000
Debt securities, available-for-sale, accrued interest, after allowance for credit loss		$ 2,200,000		$ 2,200,000		$ 2,100,000
Debt securities, held-to-maturity, accrued interest, after allowance for credit loss, statement of financial position [Extensible Enumeration]		Accrued interest receivable		Accrued interest receivable		Accrued interest receivable
Debt securities, held-to-maturity, accrued interest, after allowance for credit loss		$ 18,000		$ 18,000		$ 18,000
Investment, number of shares acquired	90,000
Investment ownership percentage	5.00%
Payments to acquire other investments	$ 1,900,000
Equity securities, FV-NI, unrealized gain (loss)		150,000	(196,000)	127,000	(270,000)
Equity securities, FV-NI, current		1,000,000		1,000,000		887,000
Investment company, financial support to investee contractually required, not provided, amount		320,000		320,000		380,000
Limited Partnership Interest, Technology Fund
Investment Securities
Equity securities without readily determinable fair value, impairment loss, annual amount		0	$ 0	0	$ 0
Limited Partnership Interest, Technology Fund | Other Assets
Investment Securities
Equity securities without readily determinable fair value, amount		$ 927,000		$ 927,000		$ 965,000

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