CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME
Net income	$ 22,357	$ 29,873	$ 23,230
Unrealized net gains (losses) on securities:
Unrealized net holding gains arising during period	2,307	7,490	1,384
Reclassification adjustment for (gains) losses included in net income	(1,597)	(170)	(1,018)
Other comprehensive income, before tax	710	7,320	366
Income tax expense related to items of other comprehensive income	292	3,228	146
Other comprehensive income, net of tax	418	4,092	220
Comprehensive income	$ 22,775	$ 33,965	$ 23,450