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Loans and Allowance for Loan Losses (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  | 3 Months Ended |
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Mortgage Loans On Real Estate [Member] | Dec. 31, 2012 Mortgage Loans On Real Estate [Member] | Mar. 31, 2013 Minimum [Member] | Dec. 31, 2012 Maximum [Member] | Mar. 31, 2013 Construction Loans [Member] | Dec. 31, 2012 Construction Loans [Member] | Mar. 31, 2013 Residential Real Estate [Member] | Mar. 31, 2012 Residential Real Estate [Member] | Dec. 31, 2012 Residential Real Estate [Member]
Impaired Financing Receivable, Recorded Investment |  |  |  |  | $ 13,200,000 | $ 14,500,000 |  |  |  |  |
Impaired Financing Receivable Loan Balance Charged Off | 6,000 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Undisbursed Loan Funds | 13,000 | 15,000 |  |  |  |  |  |  |  |  |
Related allowance recorded | 474,000 | 901,000 | 332,000 | 521,000 |  |  | 332,000 | 388,000 | 28,000 |  | 165,000
Financing Receivable Outstanding Unpaid Principal Balance |  |  |  |  |  |  |  |  | 277,800,000 |  | 263,500,000
Provision For Mortgage Repurchase Reserve |  |  |  |  |  |  |  |  | 169,000 | 119,000 |
Mortgage Loans On Real Estate Reserve Amount | $ 418,000 | $ 418,000 |  |  |  |  |  |  |  |  |

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- Definition An outstanding amount of unpaid principal balance of financing receivables with related allowance for credit losses and without related allowance for credit losses. + References No definition available. + Details
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- Definition Amount of loan balance of impaired financing receivables for charged off during the period. + References No definition available. + Details
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- Definition The amount of provisions against the mortgage repurchase reserve during period. + References No definition available. + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition The increase (decrease) during the reporting period in undistributed cash for loans that have been granted but not entirely funded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The amount of any write-down or reserve provided in the period on a mortgage loan on real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.7) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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