Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 51,330	$ 34,029	$ 166,697	$ 129,366
Net unrealized gains (losses) on available for sale securities and transferred securities:
Net unrealized holding gains (losses) arising during the period	41,919	(20,223)	35,684	(11,816)
Reclassification adjustment for net (gains) losses realized in net income	0	0	137,094	0
Change in net unrealized holding loss on securities transferred to held to maturity	2,766	3,000	8,265	8,849
Reclassification adjustments for changes realized in net income:
Net change in prior service costs	21	21	62	62
Recognized net loss due to lump sum settlement	0	0	(10)	19
Change in net actuarial loss	63	52	198	162
Derivatives:
Change in the accumulated gain (loss) on effective cash flow hedge derivatives	14,120	(8,504)	(1,505)	(18,427)
Reclassification adjustment for (gain) loss realized in net income	3,623	3,470	10,890	8,666
Other comprehensive income (loss), net of tax	62,512	(22,184)	190,678	(12,485)
Comprehensive income (loss)	$ 113,842	$ 11,845	$ 357,375	$ 116,881