Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 46,078	$ 33,547
Securities available for sale:
Unrealized holding gains (losses) on securities	15,531	(100,462)
Amortization of unrealized holding losses (gains) on securities transferred to the held to maturity category	2,328	(74)
Total securities available for sale	17,859	(100,536)
Derivative instruments:
Unrealized holding (losses) gains on derivative instruments	(1,232)	6,379
Total derivative instruments	(1,232)	6,379
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost	86	31
Total defined benefit pension and post-retirement benefit plans	86	31
Other comprehensive income (loss), net of tax	16,713	(94,126)
Comprehensive income (loss)	$ 62,791	$ (60,579)