Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Comprehensive Income
Net income	$ 9,753	$ 9,225	$ 27,728	$ 24,373
Net unrealized holding gain (loss) on securities available for sale	6,113	(4,102)	13,564	8,709
Reclassification adjustments for net gain recognized in income	(666)	(158)	(1,398)	(1,296)
Tax effect	(2,172)	1,698	(4,851)	(2,956)
Net unrealized gain on securities available for sale	3,275	(2,562)	7,315	4,457
Amortization of net actuarial loss	99	22	293	64
Amortization of prior service credit	(66)	(66)	(197)	(197)
Tax effect	(14)	18	(39)	53
Amortization of net actuarial loss and prior service credit on pension and postretirement plans, net of tax	19	(26)	57	(80)
Other comprehensive income, net of tax	3,294	(2,588)	7,372	4,377
Comprehensive income	$ 13,047	$ 6,637	$ 35,100	$ 28,750