UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 11,387	$ 5,630
Unrealized gains on securities
Unrealized holding gains arising during the period	6,403	12,598
Reclassification adjustment for gains included in net income	(27)	(623)
Amortization of losses previously held as available for sale	8	855
Net unrealized gains on securities	6,384	12,830
Deferred tax expense
Unrealized holding gain arising during the period	2,232	4,191
Amortization of losses previously held as available for sale	3	273
Net deferred tax expense	2,235	4,464
Other comprehensive income	4,149	8,366
Comprehensive income	$ 15,536	$ 13,996