Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 43,962	$ 48,559
Unrealized gains and losses on available for sale debt securities:
Net unrealized losses arising during the period	(84,971)	(9,019)
Reclassification adjustment for gains included in net income	0	(171)
Total	(84,971)	(9,190)
Unrealized gains on derivatives	10,438	4,621
Amortization related to post-retirement obligations	(276)	(109)
Total other comprehensive loss	(74,809)	(4,678)
Total comprehensive (loss) income	$ (30,847)	$ 43,881