Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 41,518	$ 39,409
Securities available for sale:
Unrealized holding gains (losses) on securities	19,970	(4,634)
Amortization of unrealized holding losses on securities transferred to the held to maturity category	2,265	2,438
Total securities available for sale	22,235	(2,196)
Derivative instruments:
Unrealized holding losses on derivative instruments	(1,322)	(570)
Total derivative instruments	(1,322)	(570)
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost	74	79
Total defined benefit pension and post-retirement benefit plans	74	79
Other comprehensive income (loss), net of tax	20,987	(2,687)
Comprehensive income	$ 62,505	$ 36,722