CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Pension and other post retirement obligations:
Amortization of actuarial losses included in net periodic pension cost, gross	$ 911	$ 820	$ 2,733	$ 2,460
Tax effect	(219)	(197)	(657)	(591)
Amortization of actuarial losses included in net periodic pension cost, net	692	623	2,076	1,869
Amortization of prior service cost included in net periodic pension cost, gross	50	15	150	46
Tax effect	(12)	(4)	(36)	(11)
Amortization of prior service cost included in net periodic pension cost, net	38	11	114	35
Other comprehensive income related to pension and other post retirement obligations, net of taxes	730	634	2,190	1,904
Unrealized (losses) gains on available-for-sale securities:
Net unrealized holding (losses) gains arising during period, gross	(21,268)	(8,821)	(168,621)	121,439
Tax effect	5,112	2,118	40,528	(29,155)
Net unrealized holding (losses) gains arising during period, net	(16,156)	(6,703)	(128,093)	92,284
Other comprehensive (loss) income related to unrealized gains (losses) on available-for-sale securities, net of taxes	(16,156)	(6,703)	(128,093)	92,284
Other comprehensive (loss) income, net of tax	(15,426)	(6,069)	(125,903)	94,188
Net income	45,336	42,809	146,130	118,191
Comprehensive income	29,910	$ 36,740	20,227	$ 212,379
Accumulated Other Comprehensive (Loss) Income By Component:
Unrealized (loss) for pension and other post-retirement obligations	(35,384)		(35,384)		$ (38,267)
Tax effect	8,701		8,701		9,394
Net unrealized (loss) for pension and other post-retirement obligations	(26,683)		(26,683)		(28,873)
Unrealized (loss) gain on available-for-sale securities	(48,507)		(48,507)		120,114
Tax effect	11,364		11,364		(29,164)
Net unrealized (loss) gain on available-for-sale securities	(37,143)		(37,143)		90,950
Accumulated other comprehensive (loss) income	$ (63,826)		$ (63,826)		$ 62,077