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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items] |  |
Days principal payments should be past due for recognition of income on a loan be discontinued and previously accrued interest is reversed | 90 days |
Loan charge-off, amount | $ 1,198,000 | $ 2,427,000
Loan commitments, Fixed rate | 830,000 |
Percentages of income tax more likely threshold positions | 50.00% |
Other Consumer |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Loan charge-off, amount | 313,000 | 302,000
Loan charge-off period | 90 days |
Bank Overdrafts |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Loan charge-off period | 45 days |
Impaired Loans Partially Charged Off |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Loan charge-off, amount | 510,000 |
Loan charge-off, number of loans | 10 |
Impaired Loans Partially Charged Off | Charge Off Treatment |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Loan charge-off, amount | 366,000 | 501,000
Minimum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Period of performance borrower need to demonstrate for a loan be restored to accrual status | 6 months |
Value of significant property | $ 200,000 |

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- Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61082-112788 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph m -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61044-112788 + Details
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