Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						9 Months Ended
	Sep. 30, 2013		Mar. 31, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 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							(5,372)	[1]	2,636	[1]
Amounts reclassified from accumulated other comprehensive income							(262)	[1]	(298)	[1]
Total other comprehensive income (loss)	(1,767)				1,164		(5,634)	[1]	2,338	[1]
Balance end of period	833	[1]			6,264	[1]	833	[1]	6,264	[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							(5,572)	[1]	2,758	[1]
Amounts reclassified from accumulated other comprehensive income							(262)	[1]	(298)	[1]
Total other comprehensive income (loss)							(5,834)	[1]	2,460	[1]
Balance end of period	937	[1]			6,593	[1]	937	[1]	6,593	[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							200	[1]	(122)	[1]
Amounts reclassified from accumulated other comprehensive income							0	[1]	0	[1]
Total other comprehensive income (loss)							200	[1]	(122)	[1]
Balance end of period	$ (104)	[1]			$ (329)	[1]	$ (104)	[1]	$ (329)	[1]

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