Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net loss	$ 150,458	$ (1,483)	$ (40,005)
Other comprehensive income (loss):
Unrealized gains arising from termination of supplemental executive retirement plans	0	0	440
Tax effect	0	0	(173)
Unrealized gains arising from termination of supplemental executive retirement plans, net of tax	0	0	267
Unrealized holdings gains (losses) arising during the period on available-for-sale securities	19,530	(26,703)	9,684
Tax effect	(7,470)	10,256	(3,824)
Unrealized holdings gains (losses) arising during the period on available-for-sale securities, net of tax	12,060	(16,447)	5,860
Reclassification adjustment for gain on available-for-sale securities included in net income (loss)	(974)	(2,772)	(4,121)
Tax effect	373	1,093	1,627
Reclassification adjustment for gain on available-for-sale securities included in net income (loss), net of tax	(601)	(1,679)	(2,494)
Unrealized gain (loss) on interest rate swaps	(537)	0	0
Tax effect	206	0	0
Unrealized gain (loss) on interest rate swaps, net of tax	(331)	0	0
Reclassification adjustment for loss on interest rate swaps included in net income	12	0	0
Tax effect	(5)	0	0
Reclassification adjustment for loss on interest rate swaps included in net income, net of tax	7	0	0
Reclassification adjustment for net actuarial gain (amortization) on pension and post retirement liability	382	(302)	503
Tax effect	(146)	115	(199)
Net actuarial gain on pension and post retirement liability, net of tax	236	(187)	304
Change in pension and post retirement liability	(2,010)	1,690	(481)
Tax effect	769	(659)	190
Change in pension and post-retirement liability, net of tax	(1,241)	1,031	(291)
Other comprehensive income (loss), net of tax	10,130	(17,282)	3,646
Comprehensive income (loss)	$ 160,588	$ (18,765)	$ (36,359)