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Loans - Allowance for Loan Losses Disaggregated on the Basis of Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment | $ 15,861 |  | $ 17,537 | $ 20,711 |  |
Loans collectively evaluated for impairment | 77,539 |  | 86,916 | 84,937 |  |
Ending balance | 93,400 | 93,589 | 104,453 | 105,648 | 107,181 | 110,147
Commercial and Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment | 11,330 |  | 13,171 | 17,983 |  |
Loans collectively evaluated for impairment | 39,484 |  | 40,993 | 35,492 |  |
Ending balance | 50,814 | 51,085 | 54,164 | 53,475 | 45,869 | 42,774
Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment | 4,531 |  | 4,366 | 2,728 |  |
Loans collectively evaluated for impairment | 19,042 |  | 24,980 | 24,903 |  |
Ending balance | 23,573 | 24,809 | 29,346 | 27,631 | 20,003 | 20,912
Consumer Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  |  |
Loans collectively evaluated for impairment | 4,917 |  | 5,252 | 5,235 |  |
Ending balance | 4,917 | 5,148 | 5,252 | 5,235 | 3,699 | 3,540
Consumer and Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  |  |
Loans collectively evaluated for impairment | 4,130 |  | 3,507 | 3,649 |  |
Ending balance | 4,130 | 3,724 | 3,507 | 3,649 | 8,715 | 12,635
Unallocated [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  |  |
Loans collectively evaluated for impairment | 9,966 |  | 12,184 | 15,658 |  |
Ending balance | $ 9,966 | $ 8,823 | $ 12,184 | $ 15,658 | $ 28,895 | $ 30,286

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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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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