Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Beginning balance	$ 19,571
Other comprehensive income (loss) before reclassifications	(7,685)
Amounts reclassified from accumulated other comprehensive income	(5,682)
Total other comprehensive income (loss), net of tax	(13,367)	7,327
Ending balance	6,204	19,571
Unrealized Gains on Available-for-Sale Securities [Member]
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Beginning balance	19,663
Other comprehensive income (loss) before reclassifications	(7,777)
Amounts reclassified from accumulated other comprehensive income	(5,682)
Total other comprehensive income (loss), net of tax	(13,459)
Ending balance	6,204
Derivative Financial Instrument [Member]
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Beginning balance	(92)
Other comprehensive income (loss) before reclassifications	92
Amounts reclassified from accumulated other comprehensive income	0
Total other comprehensive income (loss), net of tax	92
Ending balance	$ 0