Investment Securities (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) security	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) security	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Available for sale securities sold	$ 0	$ 0	$ 0	$ 0
Equity securities, at fair value	$ 5,950,000		5,950,000		$ 5,703,000
Fair value adjustment through earnings			$ 30,607,000	738,000
Available-for-sale debt securities, unrealized loss, number of positions | security	101		101
Unrealized loss	$ 8,170,000		$ 8,170,000		10,380,000
Debt Securities, available-for-sale, impairment loss			0
Securities past due or on nonaccrual	0		0
Available-for-sale, amortized cost	140,941,000		140,941,000		120,832,000
Held-to-maturity, amortized cost	484,684,000		484,684,000		513,282,000
Total
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale, amortized cost	54,100,000		54,100,000		54,500,000
Held-to-maturity, amortized cost	191,400,000		191,400,000		$ 185,900,000
Revision of Prior Period, Change in Accounting Principle, Adjustment
Debt Securities, Available-for-Sale [Line Items]
Fair value adjustment through earnings	$ 79,000	$ 151,000	$ 38,000	$ 300,000