Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Comprehensive Income
Net income	$ 9,066	$ 7,766	$ 17,975	$ 15,148
Net unrealized holding gain on securities available for sale	2,571	12,535	7,451	12,810
Reclassification adjustments for net gain recognized in income	(55)	(851)	(732)	(1,138)
Tax effect	(1,003)	(4,657)	(2,679)	(4,653)
Net unrealized gain on securities available for sale	1,513	7,027	4,040	7,019
Amortization of net actuarial loss	97	22	194	42
Amortization of prior service credit	(65)	(30)	(131)	(131)
Tax effect	(13)	3	(25)	35
Amortization of net actuarial loss and prior service credit on pension and postretirement plans, net of tax	19	(5)	38	(54)
Other comprehensive income, net of tax	1,532	7,022	4,078	6,965
Comprehensive income	$ 10,598	$ 14,788	$ 22,053	$ 22,113