CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income	$ 5,789	$ 5,105
Other comprehensive income, net of tax:
Unrealized holding gains (losses) arising during the period	441	(1,713)
Tax (provision) benefit	(173)	667
Unrealized holding gains (losses) arising during the year, net of tax	268	(1,046)
Less: Reclassification adjustment for net other-than-temporary impairment losses on securities	49	0
Tax benefit	(19)	0
Net impairment losses on securities, net of tax	30	0
Less: Reclassification adjustment for net gains on sales of securities	(147)	(267)
Tax provision	57	104
Net realized gains, net of tax	(90)	(163)
Other comprehensive income (loss), net of tax	208	(1,209)
Total net comprehensive income	$ 5,997	$ 3,896