Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 46,061	$ 56,862	$ 92,903	$ 111,696
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) on Investment Securities	(18,217)	(122,647)	11,059	(302,771)
Defined Benefit Plans	84	352	168	705
Total Other Comprehensive Income (Loss)	(18,133)	(122,295)	11,227	(302,066)
Comprehensive Income (Loss)	$ 27,928	$ (65,433)	$ 104,130	$ (190,370)