Off Balance Sheet Risk (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Commitments to extend credit
Off Balance Sheet Risk
Contract amounts representing credit risk	$ 105,657	$ 90,503
Standby letters of credit
Off Balance Sheet Risk
Contract amounts representing credit risk	$ 6,754	$ 3,768
Coverage period for instrument	1 year

The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

No definition available.

Name:	us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant