Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net income	$ 88,228	$ 41,518
Securities available for sale:
Unrealized holding (losses) gains on securities	(11,867)	19,970
Amortization of unrealized holding losses on securities transferred to the held to maturity category	1,953	2,265
Total securities available for sale	(9,914)	22,235
Derivative instruments:
Unrealized holding losses on derivative instruments	(659)	(2,014)
Amounts reclassified into earnings	626	692
Total derivative instruments	(33)	(1,322)
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost	55	74
Total defined benefit pension and post-retirement benefit plans	55	74
Other comprehensive (loss) income, net of tax	(9,892)	20,987
Comprehensive income	$ 78,336	$ 62,505