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Loans - Impaired Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | $ 59,031 | $ 69,656
Recorded Investment With No Allowance | 46,673 | 50,473
Recorded Investment With Allowance | 2,702 | 3,118
Total Recorded Investment | 49,375 | 53,591
Related Allowance | 1,534 | 1,680
Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 13,206 | 706
Recorded Investment With No Allowance | 13,130 | 636
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 13,130 | 636
Related Allowance | 0 | 0
Commercial and industrial, Other commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 26,763 | 42,212
Recorded Investment With No Allowance | 20,037 | 29,007
Recorded Investment With Allowance | 2,572 | 2,853
Total Recorded Investment | 22,609 | 31,860
Related Allowance | 1,463 | 1,613
Commercial real estate, Buildings, land and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 17,821 | 22,919
Recorded Investment With No Allowance | 12,741 | 17,441
Recorded Investment With Allowance | 130 | 265
Total Recorded Investment | 12,871 | 17,706
Related Allowance | 71 | 67
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 467 | 3,007
Recorded Investment With No Allowance | 243 | 2,793
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 243 | 2,793
Related Allowance | 0 | 0
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 774 | 812
Recorded Investment With No Allowance | 522 | 596
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 522 | 596
Related Allowance | 0 | 0
Consumer and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 0 | 0
Recorded Investment With No Allowance | 0 | 0
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 0 | 0
Related Allowance | $ 0 | $ 0

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- Definition 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 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524 + Details
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