CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Pension and other post-retirement obligations:
Amortization of actuarial losses included in net periodic pension cost, gross	$ 651	$ 303
Tax effect	(159)	(74)
Amortization of actuarial losses included in net periodic pension cost, net	492	229
Amortization of prior service cost included in net periodic pension cost, gross	(29)	(127)
Tax effect	7	31
Amortization of prior service cost included in net periodic pension cost, net	(22)	(96)
Other comprehensive income related to pension and other post-retirement obligations, net of taxes	470	133
Unrealized gains (losses) on available-for-sale securities:
Net unrealized holding gains (losses) arising during period, gross	23,905	(41,815)
Tax effect	(5,832)	10,155
Net unrealized holding gains (losses) arising during period, net	18,073	(31,660)
Other comprehensive income/(loss) related to unrealized gains (losses) on available-for-sale securities, net of taxes	18,073	(31,660)
Other comprehensive income (loss), net of tax	18,543	(31,527)
Net income	41,946	40,106
Comprehensive income	60,489	$ 8,579
Accumulated Other Comprehensive Income By Component:
Unrealized (loss) for pension and other post-retirement obligations	(42,875)		$ (43,497)
Tax effect	10,508		10,660
Net unrealized (loss) for pension and other post-retirement obligations	(32,367)		(32,837)
Unrealized gain (loss) on available-for-sale securities	7,676		(16,229)
Tax effect	(2,071)		3,969
Reclassification of other comprehensive income due to change in accounting principle - equity securities	0		(208)
Net unrealized gain (loss) on available-for-sale securities	5,605		(12,468)
Accumulated other comprehensive (loss)	$ (26,762)		$ (45,305)