Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Income	$ 17,112	$ 20,964	$ 34,383	$ 41,969
Other comprehensive (loss) income:
(Decrease) increase in net unrealized gains on securities available for sale	(18,733)	1,451	(17,461)	2,835
Deferred tax benefit (expense)	7,876	(610)	7,342	(1,192)
(Decrease) increase in net unrealized gains on securities available for sale, net of tax	(10,857)	841	(10,119)	1,643
Post-retirement benefit transition obligation amortization	15	15	30	30
Deferred tax expense	(6)	(6)	(12)	(12)
Post-retirement benefit transition obligation amortization, net of tax	9	9	18	18
Total Other Comprehensive (Loss) Income	(10,848)	850	(10,101)	1,661
Total Comprehensive Income	$ 6,264	$ 21,814	$ 24,282	$ 43,630