Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Balance beginning of period	$ 6,467,000	[1]	$ 3,926,000	[1]
Other comprehensive income before reclassifications	(176,000)	[1]	748,000	[1]
Amounts reclassified from accumulated other comprehensive income	(31,000)	[1]	(92,000)	[1]
Total other comprehensive income	(207,000)	[1]	656,000	[1]
Balance end of period	6,260,000	[1]	4,582,000	[1]
Income tax rate (in hundredths)	34.00%
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	(363,000)		(416,000)
Amounts reclassified from accumulated other comprehensive income	(31,000)	[1]	(92,000)	[1]
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Amounts reclassified from accumulated other comprehensive income	(31,000)		(92,000)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income	(31,000)		(92,000)
Net Unrealized Gains (Losses) on Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance beginning of period	6,771,000	[1]	4,133,000	[1]
Other comprehensive income before reclassifications	(215,000)	[1]	695,000	[1]
Amounts reclassified from accumulated other comprehensive income	(31,000)	[1]	(92,000)	[1]
Total other comprehensive income	(246,000)	[1]	603,000	[1]
Balance end of period	6,525,000	[1]	4,736,000	[1]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income	(31,000)	[1]	(92,000)	[1]
Net Unrealized Gains (Losses) on Securities [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Gain on securities available for sale	(47,000)	[2]	(140,000)	[2]
Income tax expense	16,000	[2]	48,000	[2]
Net of tax	(31,000)		(92,000)
Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance beginning of period	(304,000)	[1]	(207,000)	[1]
Other comprehensive income before reclassifications	39,000	[1]	53,000	[1]
Total other comprehensive income	39,000	[1]	53,000	[1]
Balance end of period	$ (265,000)	[1]	$ (154,000)	[1]

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

[2] For more information related to unrealized gains on securities available for sale, see Note 3, "Securities."