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Loans - Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Financing Receivable, Modifications [Line Items] |  |
Balance at time of restructuring | $ 819 | $ 1,955
Balance at period end | 793 | 1,888
Commercial and industrial, Energy [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Balance at time of restructuring | 0 | 0
Balance at period end | 0 | 0
Commercial and industrial, Other commercial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Balance at time of restructuring | 819 | 275
Balance at period end | 793 | 275
Commercial real estate, Buildings, land and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Balance at time of restructuring | 0 | 1,680
Balance at period end | $ 0 | $ 1,613

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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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