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Concentrations of Credit Risk (Details) (Commercial Real Estate [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Concentration Risk [Line Items] |  |
Concentration of credit risk, loan portfolio, maximum exposure | $ 304,308 | $ 303,192
College Housing and Professional Office Buildings [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk, loan portfolio, maximum exposure | 171,186 | 166,710
Residential [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk, loan portfolio, maximum exposure | 143,262 | 150,224
Automobile [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk, loan portfolio, maximum exposure | $ 11,764 | $ 13,089
Credit Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk, percentage (in hundredths) | 51.00% |
Credit Concentration Risk [Member] | College Housing and Professional Office Buildings [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk, percentage (in hundredths) | 29.00% | 28.00%
Credit Concentration Risk [Member] | Residential [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk, percentage (in hundredths) | 24.00% | 26.00%
Credit Concentration Risk [Member] | Automobile [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk, percentage (in hundredths) | 2.00% | 2.00%

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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 + Details
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