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Allowance for Loan Losses (Average Recorded Investment in Impaired Loans and Related Interest Income Recognized) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Average recorded investment in impaired loans and related interest income recognized |  |
Average investment in impaired loans | $ 3,584 | $ 3,758
Interest income recognized: |  |
Interest income recognized on a cash basis on impaired loans |  |
Commercial [Member] |  |
Average recorded investment in impaired loans and related interest income recognized |  |
Average investment in impaired loans |  | 26
Interest income recognized: |  |
Interest income recognized on a cash basis on impaired loans |  |
Commercial loans secured by real estate [Member] |  |
Average recorded investment in impaired loans and related interest income recognized |  |
Average investment in impaired loans | 3,572 | 3,732
Interest income recognized: |  |
Interest income recognized on a cash basis on impaired loans |  |
Consumer [Member] |  |
Average recorded investment in impaired loans and related interest income recognized |  |
Average investment in impaired loans | 12 |
Interest income recognized: |  |
Interest income recognized on a cash basis on impaired loans |  |

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- Definition Average 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_InterestAndOtherIncomeAbstract
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Data Type: | xbrli:stringItemType
Balance Type: | na
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