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Concentrations of Credit Risk (Details) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Hotel/motel industry credits [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk (in hundredths) | 35.00% | 37.00%
Lessors of residential buildings and dwellings credits [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk (in hundredths) | 32.00% | 33.00%
Lessors of non-residential buildings [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk (in hundredths) | 30.00% | 29.00%
Agriculture Credits [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk (in hundredths) | 17.00% | 17.00%
Coal mining and related support industries credits [Member] |  |
Concentration Risk [Line Items] |  |
Concentration of credit risk (in hundredths) | 16.00% | 22.00%

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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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