CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Comprehensive Income (Loss) [Abstract]
Net income	$ 5,960		$ 781		$ 6,882		$ 2,438
Available-for-sale securities:
Gross unrealized holding gain (loss) arising in the period	(10,763)		7,921		(13,009)		6,475
Related income tax effect	3,767		(2,772)		4,553		(2,266)
Less: reclassification adjustment for net realized gains included in net income	(5,454)	[1]	(470)	[1]	(6,132)	[1]	(1,428)	[1]
Related income tax effect	1,909	[2]	164	[2]	2,146	[2]	500	[2]
Net effect on other comprehensive income (loss)	(10,541)		4,843		(12,442)		3,281
Derivative financial instrument:
Fair value adjustment to derivative financial instrument	0		193		141		346
Related income tax effect	0		(67)		(49)		(121)
Net effect on other comprehensive income (loss)	0		126		92		225
Total other comprehensive income (loss), net of tax	(10,541)		4,969		(12,350)		3,506
Total comprehensive income (loss)	$ (4,581)		$ 5,750		$ (5,468)		$ 5,944

[1] Realized gains on available-for-sale securities recognized in realized investment gains, net on the accompanying condensed consolidated statements of operations.

[2] Income tax effect on reclassification adjustment for net realized gains included in income tax expense on the accompanying condensed consolidated statements of operations.