Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 33,547	$ 57,908
Securities available for sale:
Unrealized holding losses on securities	(100,462)	(14,943)
Reclassification adjustment for gains realized in net income	0	(1,012)
Amortization of unrealized holding gains on securities transferred to the held to maturity category	(74)	0
Total securities available for sale	(100,536)	(15,955)
Derivative instruments:
Unrealized holding gains on derivative instruments	6,379	10,984
Total derivative instruments	6,379	10,984
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost	31	42
Total defined benefit pension and post-retirement benefit plans	31	42
Other comprehensive loss, net of tax	(94,126)	(4,929)
Comprehensive (loss) income	$ (60,579)	$ 52,979