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Loans - Unallocated Portion of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | $ 161,880 | $ 135,859 | $ 105,708 | $ 99,542
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 30,302 | 4,378 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 131,578 | 131,481 |  |
Historical Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 94,224 | 77,089 |  |
Specific Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 30,302 | 4,378 |  |
General Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 14,314 | 12,603 |  |
Macroeconomic Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 23,040 | 41,789 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 45,084 | 42,993 | 43,767 | 44,273
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2,852 | 2,378 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 42,232 | 40,615 |  |
Commercial Portfolio Segment [Member] | Historical Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 28,755 | 25,428 |  |
Commercial Portfolio Segment [Member] | Specific Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 2,852 | 2,378 |  |
Commercial Portfolio Segment [Member] | General Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 5,790 | 7,339 |  |
Commercial Portfolio Segment [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 7,687 | 7,848 |  |
Commercial and industrial, Energy [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 84,973 | 54,696 | 20,946 | 14,919
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 27,450 | 2,000 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 57,523 | 52,696 |  |
Commercial and industrial, Energy [Member] | Historical Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 43,633 | 21,195 |  |
Commercial and industrial, Energy [Member] | Specific Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 27,450 | 2,000 |  |
Commercial and industrial, Energy [Member] | General Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 3,673 | 5,525 |  |
Commercial and industrial, Energy [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 10,217 | 25,976 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 23,587 | 24,313 | 27,105 | 27,163
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 23,587 | 24,313 |  |
Commercial Real Estate Portfolio Segment [Member] | Historical Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 15,352 | 15,544 |  |
Commercial Real Estate Portfolio Segment [Member] | Specific Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 0 | 0 |  |
Commercial Real Estate Portfolio Segment [Member] | General Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 4,047 | 4,619 |  |
Commercial Real Estate Portfolio Segment [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 4,188 | 4,150 |  |
Consumer Real Estate [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 3,786 | 4,659 | 4,907 | 5,178
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 3,786 | 4,659 |  |
Consumer Real Estate [Member] | Historical Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 2,097 | 2,109 |  |
Consumer Real Estate [Member] | Specific Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 0 | 0 |  |
Consumer Real Estate [Member] | General Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 1,230 | 2,052 |  |
Consumer Real Estate [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 459 | 498 |  |
Consumer and Other [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 4,450 | 9,198 | $ 8,983 | $ 8,009
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 4,450 | 9,198 |  |
Consumer and Other [Member] | Historical Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 4,387 | 12,813 |  |
Consumer and Other [Member] | Specific Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | 0 | 0 |  |
Consumer and Other [Member] | General Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | (426) | (6,932) |  |
Consumer and Other [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |
Portion of allowance for loan losses | $ 489 | $ 3,317 |  |

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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