CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income	$ 8,438	$ 6,800
Securities available for sale:
Unrealized gains on securities arising during the period	143	89
Reclassification adjustments for net realized losses on securities included in net income	55	53
Net unrealized gains on securities available for sale	198	142
Reclassification adjustment of credit-related OTTI realized losses transferred to net income	80	(13)
Cash flow hedges:
Unrealized (losses) gains on cash flow hedges arising during the period	(75)	49
Reclassification adjustments for net realized gains on cash flow hedges included in net income	110	123
Net unrealized losses on cash flow hedges	35	172
Defined benefit plan obligation adjustment	184	60
Total other comprehensive income, net of tax	497	361
Total comprehensive income	$ 8,935	$ 7,161