Consolidated Statements of Comprehensive Income (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	$ 59,788	$ 72,455	$ 102,324	$ 150,710
Securities available for sale:
Unrealized holding gains on securities	11,585	23,441	38,313	19,275
Amortization of unrealized holding losses on securities transferred to the held to maturity category	2,237	2,331	6,615	7,190
Total securities available for sale	13,822	25,772	44,928	26,465
Derivative instruments:
Unrealized holding losses on derivative instruments	(1,026)	(828)	(3,713)	(1,539)
Total derivative instruments	(1,026)	(828)	(3,713)	(1,539)
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost	75	78	223	236
Total defined benefit pension and post-retirement benefit plans	75	78	223	236
Other comprehensive income, net of tax	12,871	25,022	41,438	25,162
Comprehensive income	$ 72,659	$ 97,477	$ 143,762	$ 175,872