Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Income	$ 51,008	$ 43,050	$ 23,090
Other Comprehensive Income (Loss), Net of Tax:
Change in net unrealized gains on investment securities available-for-sale, net of tax expense of $505, $10 and $140 for the years ended December 31, 2012, 2011 and 2010, respectively	938	19	259
Change in adjustment for pension and other postretirement benefits, net of tax benefit of $3,623, $6,051 and $928 for the years ended December 31, 2012, 2011 and 2010, respectively	(6,728)	(11,237)	(1,723)
Total other comprehensive income (loss), net of tax	(5,790)	(11,218)	(1,464)
Comprehensive Income	$ 45,218	$ 31,832	$ 21,626