Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income per consolidated statements of income	$ 50,300	$ 29,211
Net unrealized gains (losses) on available for sale securities and transferred securities:
Net unrealized holding gains (losses) arising during the period	23,130	(116,753)
Change in net unrealized holding loss on securities transferred to held to maturity	2,894	400
Reclassification adjustments for changes realized in net income:
Net change in prior service costs	21	20
Recognized net loss due to lump sum settlement	19	0
Change in net actuarial loss	58	237
Derivatives:
Change in the accumulated gain (loss) on effective cash flow hedge derivatives	4,702	0
Reclassification adjustment for (gain) loss realized in net income	2,198	0
Other comprehensive income (loss), net of tax	33,022	(116,096)
Comprehensive income (loss)	$ 83,322	$ (86,885)