Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 56,787	$ 51,330	$ 166,261	$ 166,697
Net unrealized gains (losses) on available for sale securities and transferred securities:
Net unrealized holding gains (losses) arising during the period	7,286	41,919	42,229	35,684
Reclassification adjustment for net (gains) losses realized in net income	0	0	0	137,094
Change in net unrealized holding loss on securities transferred to held to maturity	2,567	2,766	7,723	8,265
Reclassification adjustments for changes realized in net income:
Net change in prior service costs	2	21	8	62
Recognized net (gain) loss due to lump sum settlement	(21)	0	(59)	(10)
Change in net actuarial loss	46	63	145	198
Derivatives:
Change in the accumulated gain (loss) on effective cash flow hedge derivatives	(617)	14,120	8,366	(1,505)
Reclassification adjustment for (gain) loss realized in net income	1,846	3,623	5,867	10,890
Other comprehensive income (loss), net of tax	11,109	62,512	64,279	190,678
Comprehensive income (loss)	$ 67,896	$ 113,842	$ 230,540	$ 357,375