Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (194,096)	$ 51,516
After Tax Amount
Net change in fair value of securities available for sale	292,031	(352,025)
Net change in fair value of cash flow hedges	21,678	(3,809)
Net change in other comprehensive income for defined benefit postretirement plans	(381)	(124)
Total other comprehensive income (loss)	313,328	(355,958)
Total comprehensive income (loss)	$ 119,232	$ (304,442)