CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Pension and other post retirement obligations:
Amortization of actuarial losses included in net periodic pension cost, gross	$ 376	$ 363	$ 751	$ 727
Tax effect	(144)	(140)	(288)	(281)
Amortization of actuarial losses included in net periodic pension cost, net	232	223	463	446
Amortization of prior service cost included in net periodic pension cost, gross	(34)	(43)	(67)	(85)
Tax effect	13	16	25	33
Amortization of prior service cost included in net periodic pension cost, net	(21)	(27)	(42)	(52)
Other comprehensive income related to pension and other post retirement obligations, net of taxes	211	196	421	394
Unrealized gains/(losses) on available-for-sale securities:
Net unrealized holding gains/(losses) arising during period, gross	31,540	(49,589)	98,796	(18,200)
Tax effect	(12,003)	19,129	(37,417)	5,756
Net unrealized holding gains/(losses) arising during period, net	19,537	(30,460)	61,379	(12,444)
Other comprehensive income/(loss) related to unrealized gains/(losses) on available-for-sale securities, net of taxes	19,537	(30,460)	61,379	(12,444)
Other comprehensive income/(loss), net of tax	19,748	(30,264)	61,800	(12,050)
Net income	25,857	23,840	50,260	46,137
Comprehensive income/(loss)	45,605	$ (6,424)	112,060	$ 34,087
Accumulated Other Comprehensive Income By Component:
Unrealized loss for pension and other post-retirement obligations	(33,663)		(33,663)		$ (34,347)
Tax effect	12,801		12,801		13,064
Net unrealized loss for pension and other post-retirement obligations	(20,862)		(20,862)		(21,283)
Unrealized gain on available-for-sale securities	164,631		164,631		65,835
Tax effect	(62,734)		(62,734)		(25,317)
Net unrealized gain on available-for-sale securities	101,897		101,897		40,518
Accumulated other comprehensive income	$ 81,035		$ 81,035		$ 19,235