Investment Securities (Narrative) (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($) security	Dec. 31, 2023 USD ($) security	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Other debt securities, provision for credit losses	$ (32,000)		$ 94,000
Proceeds from sale of AFS securities			0	$ 0
Proceeds from the sale of acquired AFS securities		$ 434,200,000	434,215,000	0
Gross losses from sale		2,200,000
Equity securities, at fair value	5,703,000	5,703,000	5,703,000	1,233,000
HTM securities	513,188,000	513,188,000	513,188,000	$ 559,455,000
Securities past due or on nonaccrual	$ 0	$ 0	$ 0
Available-for-sale securities, number of positions | security	185	185	185	192
Held-to-maturity, securities, number of positions | security	115	115	115	116
Speculative
HTM securities	$ 0	$ 0	$ 0	$ 0
Revision of Prior Period, Change in Accounting Principle, Adjustment
Fair value adjustment recorded through earnings			$ 54,000	$ (200,000)