CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 14,640	$ 16,775	$ 52,523	$ 41,208
Other comprehensive (loss) income:
Net change in unrealized gains on available-for-sale securities, net of tax	(5,139)	(586)	(20,352)	25,474
Net decrease in fair value, tax (expense) benefit	467	672	3,267	(30)
Net gain on postretirement plans, net of tax	171	133	512	399
Other comprehensive (loss) income	(4,501)	219	(16,573)	25,843
Comprehensive Income	$ 10,139	$ 16,994	$ 35,950	$ 67,051