Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 85,888	$ 81,825	$ 84,137
Unrealized Gains (Losses) on Securities:
Unrealized Holding Gain (Loss) Arising During the Period	58,769	(353,013)	(23,011)
Reclassification Adjustment for Gains Included in Net Income	(40)	(563)	(2,247)
Tax Effect	(12,351)	74,600	5,367
Net of Tax	46,378	(278,976)	(19,891)
Postretirement Benefit Obligation:
Net (Loss) Arising During the Period	0	0	0
Reclassification Adjustment for Amortization of Prior Service Cost and Net	0	54	0
Tax Effect	0	0	0
Net of Tax	0	54	0
Total Other Comprehensive Income (Loss)	46,378	(278,922)	(19,891)
COMPREHENSIVE INCOME (LOSS)	$ 132,266	$ (197,097)	$ 64,246