Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 47,903	$ 52,801	$ 140,806	$ 164,497
Other Comprehensive Loss, Net of Tax:
Net Unrealized Losses on Investment Securities	(18,264)	(79,600)	(7,205)	(382,371)
Defined Benefit Plans	84	354	252	1,059
Total Other Comprehensive Income (Loss)	(18,180)	(79,246)	(6,953)	(381,312)
Comprehensive Income (Loss)	$ 29,723	$ (26,445)	$ 133,853	$ (216,815)