Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						6 Months Ended
	Jun. 30, 2013		Mar. 31, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Balance beginning of period			$ 6,467	[1]			$ 6,467	[1]	$ 3,926	[1]
Other comprehensive income (loss) before reclassifications							(3,621)	[1]	1,364	[1]
Amounts reclassified from accumulated other comprehensive income							(246)	[1]	(190)	[1]
Total other comprehensive income (loss)	(3,660)				518		(3,867)	[1]	1,174	[1]
Balance end of period	2,600	[1]			5,100	[1]	2,600	[1]	5,100	[1]
Income tax rate			34.00%
Net Unrealized Gains (Losses) on Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance beginning of period			6,771	[1]			6,771	[1]	4,133	[1]
Other comprehensive income (loss) before reclassifications							(3,825)	[1]	1,451	[1]
Amounts reclassified from accumulated other comprehensive income							(246)	[1]	(190)	[1]
Total other comprehensive income (loss)							(4,071)	[1]	1,261	[1]
Balance end of period	2,700	[1]			5,394	[1]	2,700	[1]	5,394	[1]
Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance beginning of period			(304)	[1]			(304)	[1]	(207)	[1]
Other comprehensive income (loss) before reclassifications							204	[1]	(87)	[1]
Amounts reclassified from accumulated other comprehensive income							0	[1]	0	[1]
Total other comprehensive income (loss)							204	[1]	(87)	[1]
Balance end of period	$ (100)	[1]			$ (294)	[1]	$ (100)	[1]	$ (294)	[1]

[1] All amounts shown are net of applicable income taxes using an income tax rate of 34%.