Investment Securities (Narrative) (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2023 USD ($) security	Sep. 30, 2023 USD ($) security	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) security	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Investments [Line Items]
Other debt securities, provision for credit losses		$ (37,000)		$ 126,000
Available for sale securities sold		0	$ 0	0	$ 0
Equity securities, at fair value	$ 5,434,000	5,434,000		5,434,000		$ 1,233,000
Net income				738,000	22,769,000
Held-to-maturity securities	$ 523,051,000	$ 523,051,000		$ 523,051,000		559,455,000
Available-for-sale debt securities, unrealized loss, number of positions | security	116	116		116
Available-for-sale securities, continuous unrealized loss position, unrealized losses	$ 13,939,000	$ 13,939,000		$ 13,939,000		12,419,000
Debt Securities, available-for-sale, impairment loss				0
Securities past due or on nonaccrual	0	0		0
Held-to-maturity, amortized cost	523,177,000	523,177,000		523,177,000		559,455,000
Available-for-sale, amortized cost	93,052,000	93,052,000		93,052,000		95,999,000
Proceeds from the sale of acquired AFS securities	430,000,000			434,215,000	0
Loss on sale	2,200,000
Total
Schedule of Investments [Line Items]
Held-to-maturity, amortized cost	180,700,000	180,700,000		180,700,000		19,200,000
Available-for-sale, amortized cost	53,300,000	53,300,000		53,300,000		72,100,000
Speculative
Schedule of Investments [Line Items]
Held-to-maturity securities	0	0		0		0
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]
Schedule of Investments [Line Items]
Net income				(300,000)	$ (100,000)
Mortgage-backed-residential
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, unrealized losses	9,798,000	9,798,000		9,798,000		8,666,000
Held-to-maturity, amortized cost	367,712,000	367,712,000		367,712,000		398,884,000
U.S. Government agencies
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, unrealized losses	3,995,000	3,995,000		3,995,000		3,625,000
Held-to-maturity, amortized cost	143,494,000	143,494,000		143,494,000		148,097,000
Other debt securities
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, unrealized losses	146,000	146,000		146,000		128,000
Held-to-maturity, amortized cost	$ 10,500,000	$ 10,500,000		$ 10,500,000		$ 11,000,000