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Allowance for Loan Losses and Credit Quality Indicators - Additional information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total impaired loans, Recorded Investment | $ 28,813,000 |  | $ 23,202,000
Total impaired loans, Unpaid Principal Balance | 37,093,000 |  | 29,356,000
Total impaired loans, Related Allowance | 6,401,000 |  | 5,593,000
Total impaired loans, Average Recorded Investment | 26,012,000 | 28,540,000 |
Total impaired loans, Interest Income Recognized | 644,000 | 194,000 |
Minimum commercial loan relationships to be reviewed by loan review function | 3,000,000 |  |
Total loan restructurings | 11,870,000 |  | 12,050,000
Net nonaccrual status | 2,340,000 |  | 3,830,000
Nonperforming TDRs | 1,600,000 |  | 6,010,000
Percentage of Total TDR | 13.45% |  | 49.88%
Allowance for loan losses | 1,650,000 |  | 1,870,000
Interest income recognized on loan restructurings | 246,000 | 94,000 |
Restructured loans to borrowers experiencing financial difficulty in excess of | 250,000 |  |
Performing status returned period | 6 months |  |
Payment defaults on loans modified as TDRs | 0 | 0 |
Time period for restructuring | 12 months | 12 months |
Three of the seven purchased credit impaired loan pools |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total impaired loans, Recorded Investment | 20,080,000 |  |
Total impaired loans, Unpaid Principal Balance | 26,610,000 |  |
Total impaired loans, Related Allowance | 276,000 |  |
Total impaired loans, Average Recorded Investment | 20,230,000 |  |
Total impaired loans, Interest Income Recognized | $ 84,000 |  |

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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 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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- Definition Troubled debt restructurings. + References No definition available. + 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=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
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- Definition Amount of interest income recognized 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)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + 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=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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- 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=7512638&loc=d3e5212-111524 + Details
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