Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Comprehensive income:
Net income	$ 8,909	$ 7,382
Net unrealized holding gain on securities available for sale	4,880	275
Reclassification adjustments for net gain recognized in income	(677)	(287)
Tax effect	(1,676)	4
Net unrealized gain (loss) on securities available for sale	2,527	(8)
Amortization of net actuarial loss	97	20
Amortization of prior service credit	(66)	(101)
Tax effect	(12)	32
Amortization of net actuarial loss and prior service credit on pension and postretirement plans, net of tax	19	(49)
Other comprehensive income (loss), net of tax	2,546	(57)
Comprehensive income	$ 11,455	$ 7,325