Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 6,255	$ 6,929	$ 19,250	$ 20,338
Unrealized gains on available for sale securities:
Unrealized holding gains on available for sale arising during period	4,350	3,764	5,871	7,327
Reclassification adjustment for gains included in net income	(121)	(66)	(688)	(71)
Net change in unrealized gains on available for sale securities	4,229	3,698	5,183	7,256
Unrealized gain (loss) on cash flow hedging derivatives	109	(5,281)	(645)	(6,363)
Postretirement plans:
Net actuarial gain arising during period	23	11	71	34
Reclassification: amortization of prior service cost included in net periodic cost	3	3	9	8
Other comprehensive income (loss)	4,364	(1,569)	4,618	935
Comprehensive income	$ 10,619	$ 5,360	$ 23,868	$ 21,273