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Loans - Average Recorded Investment In Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | $ 83,747 | $ 46,458 | $ 104,198 | $ 49,091
Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | 26,921 | 25,487 | 25,365 | 28,457
Commercial and industrial, Energy [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | 47,003 | 6,883 | 57,309 | 3,760
Commercial real estate, Buildings, land and other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | 8,904 | 13,003 | 20,444 | 14,658
Construction Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | 326 | 249 | 548 | 1,507
Consumer Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | 545 | 836 | 508 | 709
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average recorded investment | $ 48 | $ 0 | $ 24 | $ 0

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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=66008989&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=66008989&loc=d3e5258-111524 + Details
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