Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 39,409	$ 46,078
Securities available for sale:
Unrealized holding (losses) gains on securities	(4,634)	15,531
Amortization of unrealized holding losses on securities transferred to the held to maturity category	2,438	2,328
Total securities available for sale	(2,196)	17,859
Derivative instruments:
Unrealized holding losses on derivative instruments	(570)	(1,232)
Total derivative instruments	(570)	(1,232)
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost	79	86
Total defined benefit pension and post-retirement benefit plans	79	86
Other comprehensive (loss) income, net of tax	(2,687)	16,713
Comprehensive income	$ 36,722	$ 62,791