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Loans - Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Financing Receivable, Modifications [Line Items] |  |
Balance at time of restructuring | $ 13,833 | $ 445
Commercial and industrial, Energy [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Balance at time of restructuring | 528 | 0
Commercial and industrial, Other commercial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Balance at time of restructuring | 5,862 | 445
Commercial real estate, Buildings, land and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Balance at time of restructuring | $ 7,443 | $ 0

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- 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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