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Loans - Average Recorded Investment In Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | $ 73,476 | $ 89,897 | $ 77,559 | $ 88,127
Commercial and industrial, Energy [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | 269 | 0 | 402 | 0
Commercial and industrial, Other commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | 33,613 | 44,140 | 38,032 | 43,087
Commercial real estate, Buildings, land and other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | 37,960 | 42,569 | 37,149 | 41,283
Commercial real estate, Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | 508 | 1,671 | 793 | 1,465
Consumer Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | 788 | 1,087 | 818 | 1,805
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | $ 338 | $ 430 | $ 365 | $ 487

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524 + Details
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