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Allowance for Loan Losses and Credit Quality Indicators - Additional information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Impaired loans, recorded investment | $ 27,144,000 |  | $ 27,144,000 |  | $ 23,202,000
Impaired loans, unpaid principal balance | 35,991,000 |  | 35,991,000 |  | 29,356,000
Impaired loans, related allowance | 5,256,000 |  | 5,256,000 |  | 5,593,000
Impaired loans, average recorded investment | 31,283,000 | 25,731,000 | 30,905,000 | 29,980,000 |
Minimum commercial loan relationships to be reviewed by loan review function | 3,000,000 |  | 3,000,000 |  |
Total loan restructurings | 11,920,000 |  | 11,920,000 |  | 12,050,000
Net nonaccrual status | 2,660,000 |  | 2,660,000 |  | 3,830,000
Nonperforming TDRs | 2,230,000 |  | 2,230,000 |  | 6,010,000
Percentage of Total TDR | 18.69% |  | 18.69% |  | 49.88%
Allowance for loan losses | 1,690,000 |  | 1,690,000 |  | 1,870,000
Interest income recognized on loan restructurings | 183,000 | 62,000 | 422,000 | 237,000 |
Restructured loans to borrowers experiencing financial difficulty in excess of | 250,000 |  | 250,000 |  |
Performing status returned period |  |  | 6 months |  |
Four of the seven purchased credit impaired loan pools |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Impaired loans, recorded investment | 23,450,000 |  | 23,450,000 |  |
Impaired loans, unpaid principal balance | 36,300,000 |  | 36,300,000 |  |
Impaired loans, related allowance | 1,040,000 |  | 1,040,000 |  |
Impaired loans, average recorded investment | 23,540,000 |  | 15,800,000 |  |
Impaired loans, interest income recognized | 721,000 |  | 839,000 |  |
Covered Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Accruing loans contractually past due 90 days or more | $ 82,000 |  | $ 82,000 |  |

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- Definition Allowance for loan losses. + References No definition available. + Details
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- Definition Total commercial loans. + References No definition available. + Details
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- Definition Impaired Financing Receivable Interest Income Recognized + References No definition available. + Details
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- Definition Interest income recognized on loan restructurings. + References No definition available. + Details
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- Definition Total loan restructurings. + References No definition available. + Details
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- Definition Net nonaccrual status. + References No definition available. + Details
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- Definition Nonperforming TDRs. + References No definition available. + Details
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- Definition Performing status returned period. + References No definition available. + Details
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- Definition Restructured loans reserves. + References No definition available. + Details
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- Details
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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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=28368275&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=28368275&loc=d3e5258-111524 + Details
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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=28368275&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=28368275&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 + Details
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- Definition Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans. + References No definition available. + Details
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