CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Pension and other post retirement obligations:
Amortization of actuarial (gains)/losses included in net periodic pension cost, gross	$ 363	$ (79)	$ 1,090	$ (235)
Tax effect	(140)	31	(421)	92
Amortization of actuarial (gains)/losses included in net periodic pension cost, net	223	(48)	669	(143)
Amortization of prior service cost included in net periodic pension cost, gross	(43)	(43)	(127)	(130)
Tax effect	16	17	49	51
Amortization of prior service cost included in net periodic pension cost, net	(27)	(26)	(78)	(79)
Other comprehensive income/(loss) related to pension and other post retirement obligations, net of taxes	196	(74)	591	(222)
Unrealized gains/(losses) on available-for-sale securities:
Net unrealized holding gains/(losses) arising during period, gross	44,019	(1,808)	25,819	75,214
Tax effect	(16,979)	710	(11,223)	(27,776)
Net unrealized holding gains/(losses) arising during period, net	27,040	(1,098)	14,596	47,438
Other comprehensive income/(loss) related to unrealized gains/(losses) on available-for-sale securities, net of taxes	27,040	(1,098)	14,596	47,438
Other comprehensive income/(loss), net of tax	27,236	(1,172)	15,187	47,216
Net income	25,022	22,371	71,159	68,220
Comprehensive income	52,258	$ 21,199	86,346	$ 115,436
Accumulated Other Comprehensive Income By Component:
Unrealized loss for pension and other postretirement obligations	(25,979)		(25,979)		$ (26,941)
Tax effect	9,854		9,854		10,225
Net unrealized loss for pension and other postretirement obligations	(16,125)		(16,125)		(16,716)
Unrealized gain on available-for-sale securities	100,858		100,858		75,039
Tax effect	(38,826)		(38,826)		(27,603)
Net unrealized gain on available-for-sale securities	62,032		62,032		47,436
Accumulated other comprehensive income	$ 45,907		$ 45,907		$ 30,720