CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Comprehensive income:
Net income	$ 23,303	$ 23,009	$ 20,310
Other comprehensive income:
Net unrealized gain (loss) on securities available-for-sale, net of tax	1,756	7,268	(2,149)
Reclassification adjustments for gains included in net income, net of tax	(1,712)	(28)
FASB ASC 715 adjustment, net of tax	(3,384)	(6,713)	(918)
Foreign currency translation adjustments		(32)
Total comprehensive income	$ 19,963	$ 23,504	$ 17,243