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Troubled Debt Restructurings by Class of Loan and Accrual Status (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | $ 286,236 | $ 281,356
Residential |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 108,603 | 116,868
Land |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 9,657 | 9,972
Construction |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 11,763 | 6,979
Commercial Real Estate |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 68,902 | 57,840
Commercial Business |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 18,655 | 20,776
Home Equity and Second Mortgage |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 37,286 | 38,887
Other Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 31,370 | 30,034
Troubled Debt Restructuring |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 221 | 462
Nonaccrual | 4,099 | 4,209
Recorded investment in loans | 4,320 | 4,671
Related Allowance For Loan Losses | 1,293 | 1,136
Troubled Debt Restructuring | Residential |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 180 | 112
Nonaccrual | 588 | 516
Recorded investment in loans | 768 | 628
Related Allowance For Loan Losses | 87 | 11
Troubled Debt Restructuring | Land |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 0 | 135
Nonaccrual | 0 | 0
Recorded investment in loans | 0 | 135
Related Allowance For Loan Losses | 0 | 0
Troubled Debt Restructuring | Construction |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 0 | 207
Nonaccrual | 170 | 247
Recorded investment in loans | 170 | 454
Related Allowance For Loan Losses | 0 | 0
Troubled Debt Restructuring | Commercial Real Estate |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 0 | 0
Nonaccrual | 1,534 | 1,603
Recorded investment in loans | 1,534 | 1,603
Related Allowance For Loan Losses | 83 | 211
Troubled Debt Restructuring | Commercial Business |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 0 | 0
Nonaccrual | 1,776 | 1,843
Recorded investment in loans | 1,776 | 1,843
Related Allowance For Loan Losses | 1,098 | 914
Troubled Debt Restructuring | Home Equity and Second Mortgage |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 41 | 8
Nonaccrual | 31 | 0
Recorded investment in loans | 72 | 8
Related Allowance For Loan Losses | 25 | 0
Troubled Debt Restructuring | Other Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 0 | 0
Nonaccrual | 0 | 0
Recorded investment in loans | 0 | 0
Related Allowance For Loan Losses | $ 0 | $ 0

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph a(ii) -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -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. + Details
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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + 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 (a) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph g -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. + Details
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