CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 138,257	$ 73,447	$ 105,333
Other comprehensive (loss) income, before tax (benefit) expense:
Unrealized holding (losses) gains on securities arising during the period	(29,892)	19,981	20,625
Less: reclassification adjustment for gains on securities included in net income	(16)	(70)	(22)
Unrealized holding (losses) gains on derivatives arising during the period	(3,356)	(4,467)	935
Unrealized gains (losses) for postretirement obligation:
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax	76	(537)	0
Net gain (loss)	275	(155)	(121)
Total other comprehensive (loss) income, before income tax (benefit) expense	(32,913)	14,752	21,417
Income tax (benefit) expense related to items of other comprehensive (loss) income	(6,912)	3,098	4,497
Comprehensive Income	$ 112,256	$ 85,101	$ 122,253