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Loans - Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013
Financing Receivable, Modifications [Line Items] |  |
Balance at time of restructuring | $ 6,874 | $ 6,303
Balance at period end | 6,741 | 5,069
Commercial and industrial, Other commercial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Balance at time of restructuring | 3,752 | 2,138
Balance at period end | 3,672 | 1,343
Commercial real estate, Buildings, land and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Balance at time of restructuring | 3,122 | 4,165
Balance at period end | $ 3,069 | $ 3,726

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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