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Disclosures About Fair Value Measurements (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
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Mar. 31, 2013 | Dec. 31, 2012
Disclosures About Fair Value Measurements [Abstract] |  |
Carrying value of impaired loans | $ 2,339 | $ 4,806
Specific valuation allowance | 477 | 1,586
Net fair value of impaired loans | $ 1,900 | $ 3,200
Assets and liabilities considered financial instruments, percentage | 90.00% |
Loan held for sale account delivery dates lock period | 30, 45, or 60 day lock period |

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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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