Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 73,832	$ 45,037	$ 115,367	$ 95,337
Net unrealized gains (losses) on available for sale securities and transferred securities:
Net unrealized holding gains (losses) arising during the period	(4,321)	(14,723)	(6,235)	8,407
Reclassification adjustment for net (gains) losses realized in net income	137,094	0	137,094	0
Change in net unrealized holding loss on securities transferred to held to maturity	2,753	2,955	5,499	5,849
Reclassification adjustments for changes realized in net income:
Net change in prior service costs	20	20	41	41
Recognized net loss due to lump sum settlement	(10)	0	(10)	19
Change in net actuarial loss	64	52	135	110
Derivatives:
Change in the accumulated gain (loss) on effective cash flow hedge derivatives	(3,655)	(14,625)	(15,625)	(9,923)
Reclassification adjustment for (gain) loss realized in net income	3,652	2,998	7,267	5,196
Other comprehensive income (loss), net of tax	135,597	(23,323)	128,166	9,699
Comprehensive income (loss)	$ 209,429	$ 21,714	$ 243,533	$ 105,036