Investment Securities (Narrative) (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) security	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Schedule of Investments [Line Items]
Other debt securities, provision for credit losses	$ 22,000	$ 163,000
Available for sale securities sold	0	0
Equity securities, at fair value	5,681,000		$ 5,703,000
Fair value adjustment through earnings	(8,184,000)	(6,457,000)
Held-to-maturity securities	$ 503,822,000		513,188,000
Available-for-sale debt securities, unrealized loss, number of positions | security	115
Available-for-sale securities, continuous unrealized loss position, unrealized losses	$ 11,437,000		10,380,000
Debt Securities, available-for-sale, impairment loss	0
Securities past due or on nonaccrual	0
Held-to-maturity, amortized cost	503,938,000		513,282,000
Available-for-sale, amortized cost	190,583,000		120,832,000
Total
Schedule of Investments [Line Items]
Held-to-maturity, amortized cost	195,800,000		185,900,000
Available-for-sale, amortized cost	53,100,000		54,500,000
Speculative
Schedule of Investments [Line Items]
Held-to-maturity securities	0		$ 0
Revision of Prior Period, Change in Accounting Principle, Adjustment
Schedule of Investments [Line Items]
Fair value adjustment through earnings	$ (61,000)	$ 17,000