CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 6,685	$ 13,685	$ 18,562
Available-for-sale securities:
Changes in unrealized gains (losses)	65	1,407	(1,084)
Reclassification adjustments for gains included in net income	(379)	(184)	(54)
Net change	(314)	1,223	(1,138)
Cash flow hedges:
Changes in unrealized gains (losses)	283	246	(283)
Reclassification adjustments for gains (losses) included in net income	(515)	195	(183)
Net change	(232)	441	(466)
Other comprehensive income (loss) before tax	(546)	1,664	(1,604)
Income tax benefit (expense) related to components of other comprehensive income (loss)	105	(403)	386
Other comprehensive income (loss), net of taxes	(441)	1,261	(1,218)
Comprehensive income	$ 6,244	$ 14,946	$ 17,344