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Troubled Debt Restructurings by Accrual Status (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | $ 294,831 | $ 286,236
Residential |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 108,790 | 108,603
Land |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 10,141 | 9,657
Construction |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 9,752 | 11,763
Commercial Real Estate |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 77,965 | 68,902
Commercial Business |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 20,082 | 18,655
Home Equity and Second Mortgage |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 35,026 | 37,286
Other Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded investment in loans | 33,075 | 31,370
Troubled Debt Restructuring |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 1,491 | 221
Nonaccrual | 2,115 | 4,099
Recorded investment in loans | 3,606 | 4,320
Related Allowance For Loan Losses | 1,351 | 1,293
Troubled Debt Restructuring | Residential |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 356 | 180
Nonaccrual | 315 | 588
Recorded investment in loans | 671 | 768
Related Allowance For Loan Losses | 48 | 87
Troubled Debt Restructuring | Land |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 0 | 0
Nonaccrual | 0 | 0
Recorded investment in loans | 0 | 0
Related Allowance For Loan Losses | 0 | 0
Troubled Debt Restructuring | Construction |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 0 | 0
Nonaccrual | 0 | 170
Recorded investment in loans | 0 | 170
Related Allowance For Loan Losses | 0 | 0
Troubled Debt Restructuring | Commercial Real Estate |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 1,135 | 0
Nonaccrual | 0 | 1,534
Recorded investment in loans | 1,135 | 1,534
Related Allowance For Loan Losses | 0 | 83
Troubled Debt Restructuring | Commercial Business |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 0 | 0
Nonaccrual | 1,742 | 1,776
Recorded investment in loans | 1,742 | 1,776
Related Allowance For Loan Losses | 1,293 | 1,098
Troubled Debt Restructuring | Home Equity and Second Mortgage |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing | 0 | 41
Nonaccrual | 58 | 31
Recorded investment in loans | 58 | 72
Related Allowance For Loan Losses | 10 | 25
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 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 2: 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 3: 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 4: 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=28367877&loc=d3e4428-111522 + Details
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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which interest is continuing to be earned or accrued. + References No definition available. + 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=28368275&loc=d3e5111-111524 + Details
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