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Loans - Unallocated Portion of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | --- | --- | ---
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | $ 110,373 | $ 106,607 | $ 99,542 | $ 98,312 | $ 98,286 | $ 92,438
Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 71,295 |  | 59,604 |  |  |
Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,534 |  | 1,680 |  |  |
Environmental Risk Adjustment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 15,320 |  | 13,477 |  |  |
Distressed Industries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,574 |  | 3,093 |  |  |
Excessive Industry Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 5,981 |  | 2,492 |  |  |
Large Relationship Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,229 |  | 3,807 |  |  |
Highly-Leveraged Credit Relationships [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 5,663 |  | 5,305 |  |  |
Policy Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 3,456 |  | 2,782 |  |  |
Credit and Collateral Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 2,164 |  |  |
Loans Not Reviewed by Concurrence [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,845 |  | 7,906 |  |  |
Adjustment for Recoveries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (13,082) |  | (15,837) |  |  |
General Macroeconomic Risk [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 5,558 |  | 13,069 |  |  |
Commercial and Industrial [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 70,803 | 68,725 | 59,192 | 58,636 | 55,672 | 52,790
Commercial and Industrial [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 41,814 |  | 32,421 |  |  |
Commercial and Industrial [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,463 |  | 1,613 |  |  |
Commercial and Industrial [Member] | Environmental Risk Adjustment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,932 |  | 6,773 |  |  |
Commercial and Industrial [Member] | Distressed Industries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,309 |  | 3,090 |  |  |
Commercial and Industrial [Member] | Excessive Industry Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 5,765 |  | 2,114 |  |  |
Commercial and Industrial [Member] | Large Relationship Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,461 |  | 2,248 |  |  |
Commercial and Industrial [Member] | Highly-Leveraged Credit Relationships [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,446 |  | 3,958 |  |  |
Commercial and Industrial [Member] | Policy Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,531 |  | 1,907 |  |  |
Commercial and Industrial [Member] | Credit and Collateral Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  | 1,483 |  |  |
Commercial and Industrial [Member] | Loans Not Reviewed by Concurrence [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,121 |  | 2,110 |  |  |
Commercial and Industrial [Member] | Adjustment for Recoveries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (3,588) |  | (6,234) |  |  |
Commercial and Industrial [Member] | General Macroeconomic Risk [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 3,549 |  | 7,709 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 25,883 | 24,935 | 27,163 | 26,780 | 22,046 | 22,590
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 | 15,211 |  | 14,684 |  |  |
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 | 71 |  | 67 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Environmental Risk Adjustment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 3,752 |  | 3,547 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Distressed Industries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 265 |  | 3 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Excessive Industry Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 216 |  | 378 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Large Relationship Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,768 |  | 1,559 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Highly-Leveraged Credit Relationships [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,217 |  | 1,347 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Policy Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 925 |  | 875 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Credit and Collateral Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  | 681 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Loans Not Reviewed by Concurrence [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,193 |  | 2,284 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Adjustment for Recoveries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (1,032) |  | (1,800) |  |  |
Commercial Real Estate Portfolio Segment [Member] | General Macroeconomic Risk [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,297 |  | 3,538 |  |  |
Consumer Real Estate [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,804 | 4,702 | 5,178 | 5,107 | 4,659 | 5,230
Consumer Real Estate [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,089 |  | 2,017 |  |  |
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] | Environmental Risk Adjustment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 492 |  | 474 |  |  |
Consumer Real Estate [Member] | Distressed Industries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer Real Estate [Member] | Excessive Industry Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer Real Estate [Member] | Large Relationship Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer Real Estate [Member] | Highly-Leveraged Credit Relationships [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer Real Estate [Member] | Policy Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer Real Estate [Member] | Credit and Collateral Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  | 0 |  |  |
Consumer Real Estate [Member] | Loans Not Reviewed by Concurrence [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,448 |  | 2,336 |  |  |
Consumer Real Estate [Member] | Adjustment for Recoveries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (475) |  | (364) |  |  |
Consumer Real Estate [Member] | General Macroeconomic Risk [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 250 |  | 715 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 8,883 | 8,245 | 8,009 | 7,789 | 6,427 | 5,010
Consumer and Other [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 12,181 |  | 10,482 |  |  |
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] | Environmental Risk Adjustment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 3,144 |  | 2,683 |  |  |
Consumer and Other [Member] | Distressed Industries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer and Other [Member] | Excessive Industry Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer and Other [Member] | Large Relationship Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer and Other [Member] | Highly-Leveraged Credit Relationships [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer and Other [Member] | Policy Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer and Other [Member] | Credit and Collateral Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  | 0 |  |  |
Consumer and Other [Member] | Loans Not Reviewed by Concurrence [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,083 |  | 1,176 |  |  |
Consumer and Other [Member] | Adjustment for Recoveries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (7,987) |  | (7,439) |  |  |
Consumer and Other [Member] | General Macroeconomic Risk [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 462 |  | 1,107 |  |  |
Unallocated [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | $ 0 | $ 0 | $ 0 | $ 0 | $ 9,482 | $ 6,818

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