Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 41,535	$ 50,300
Net unrealized gains (losses) on available for sale securities and transferred securities:
Net unrealized holding gains (losses) arising during the period	(1,914)	23,130
Change in net unrealized holding loss on securities transferred to held to maturity	2,746	2,894
Reclassification adjustments for changes realized in net income:
Net change in prior service costs	21	21
Recognized net loss due to lump sum settlement	0	19
Change in net actuarial loss	71	58
Derivatives:
Change in the accumulated gain (loss) on effective cash flow hedge derivatives	(11,970)	4,702
Reclassification adjustment for (gain) loss realized in net income	3,615	2,198
Other comprehensive income (loss), net of tax	(7,431)	33,022
Comprehensive income (loss)	$ 34,104	$ 83,322