Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Components of accumulated other comprehensive income
Unrealized Gains (Losses) on Securities Available-for-Sale, Beginning balance	$ 12,672	$ 11,036
Unrealized Gains (Losses) on Derivative Instruments, Beginning balance	(3,570)	(3,194)
Beginning balance, Total	9,101	7,842
Unrealized Gains (Losses) on Securities Available-for-Sale, Other comprehensive income before reclassifications	(1,107)	564
Unrealized Gains (Losses) on Derivative Instruments, Other comprehensive income before reclassifications	285	367
Other comprehensive income before reclassifications, Total	(822)	931
Unrealized Gains (Losses) on Securities Available-for-Sale, Amounts reclassified from other comprehensive income	(239)
Unrealized Gains (Losses) on Derivative Instruments,, Amounts reclassified from other comprehensive income
Amounts reclassified from other comprehensive income, Total	(239)
Unrealized Gains (Losses) on Securities Available-for-Sale, Period change	(1,346)	564
Unrealized Gains (Losses) on Derivative Instruments, Period change	285	367
Period change, Total	(1,061)	931
Unrealized Gains (Losses) on Securities Available-for-Sale, Ending balance	11,326	11,600
Unrealized Gains (Losses) on Derivative Instruments, Ending balance	(3,285)	(2,827)
Ending balance, Total	$ 8,040	$ 8,773

Other comprehensive income loss amount reclassified from other comprehensive income net of tax.

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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