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Loans - Unallocated Portion of Allowance for Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011
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Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | $ 93,400 | $ 93,589 | $ 104,453 | $ 105,648 | $ 107,181 | $ 110,147
Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 48,138 |  | 56,609 |  |  |
Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,494 |  | 8,237 |  |  |
Environmental Risk Adjustment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 10,630 |  | 12,775 |  |  |
Distressed Industries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 8,517 |  | 7,065 |  |  |
Excessive Industry Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 5,008 |  | 7,086 |  |  |
Large Relationship Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,279 |  | 2,401 |  |  |
Highly-Leveraged Credit Relationships [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 5,258 |  | 3,604 |  |  |
Policy Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,190 |  | 2,466 |  |  |
Credit and Collateral Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,707 |  | 1,635 |  |  |
Loans Not Reviewed by Concurrence [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,352 |  | 8,260 |  |  |
Adjustment for Recoveries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (11,242) |  | (13,768) |  |  |
General Macroeconomic Risk [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 6,069 |  | 8,083 |  |  |
Commercial and Industrial [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 50,814 | 51,085 | 54,164 | 53,475 | 45,869 | 42,774
Commercial and Industrial [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 24,910 |  | 30,565 |  |  |
Commercial and Industrial [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,150 |  | 5,100 |  |  |
Commercial and Industrial [Member] | Environmental Risk Adjustment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,896 |  | 6,593 |  |  |
Commercial and Industrial [Member] | Distressed Industries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 8,005 |  | 5,883 |  |  |
Commercial and Industrial [Member] | Excessive Industry Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 3,705 |  | 4,291 |  |  |
Commercial and Industrial [Member] | Large Relationship Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,335 |  | 1,420 |  |  |
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 | 4,497 |  | 2,905 |  |  |
Commercial and Industrial [Member] | Policy Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
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 |  |  |  |  |  |
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 | 1,994 |  | 2,277 |  |  |
Commercial and Industrial [Member] | Adjustment for Recoveries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (2,678) |  | (4,870) |  |  |
Commercial and Industrial [Member] | General Macroeconomic Risk [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 23,573 | 24,809 | 29,346 | 27,631 | 20,003 | 20,912
Commercial Real Estate [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 12,741 |  | 15,687 |  |  |
Commercial Real Estate [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 3,344 |  | 3,137 |  |  |
Commercial Real Estate [Member] | Environmental Risk Adjustment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 3,073 |  | 3,682 |  |  |
Commercial Real Estate [Member] | Distressed Industries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 512 |  | 1,182 |  |  |
Commercial Real Estate [Member] | Excessive Industry Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,303 |  | 2,795 |  |  |
Commercial Real Estate [Member] | Large Relationship Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 944 |  | 981 |  |  |
Commercial Real Estate [Member] | Highly-Leveraged Credit Relationships [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 761 |  | 699 |  |  |
Commercial Real Estate [Member] | Policy Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Commercial Real Estate [Member] | Credit and Collateral Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Commercial 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 | 2,145 |  | 2,413 |  |  |
Commercial Real Estate [Member] | Adjustment for Recoveries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (1,250) |  | (1,230) |  |  |
Commercial Real Estate [Member] | General Macroeconomic Risk [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Consumer Real Estate [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,917 | 5,148 | 5,252 | 5,235 | 3,699 | 3,540
Consumer Real Estate [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,591 |  | 3,013 |  |  |
Consumer Real Estate [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Consumer Real Estate [Member] | Environmental Risk Adjustment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 620 |  | 684 |  |  |
Consumer Real Estate [Member] | Distressed Industries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Consumer Real Estate [Member] | Excessive Industry Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Consumer Real Estate [Member] | Large Relationship Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
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 |  |  |  |  |  |
Consumer Real Estate [Member] | Policy Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
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 |  |  |  |  |  |
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 | 2,178 |  | 2,411 |  |  |
Consumer Real Estate [Member] | Adjustment for Recoveries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (472) |  | (856) |  |  |
Consumer Real Estate [Member] | General Macroeconomic Risk [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,130 | 3,724 | 3,507 | 3,649 | 8,715 | 12,635
Consumer and Other [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,896 |  | 7,344 |  |  |
Consumer and Other [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Consumer and Other [Member] | Environmental Risk Adjustment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,041 |  | 1,816 |  |  |
Consumer and Other [Member] | Distressed Industries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Consumer and Other [Member] | Excessive Industry Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Consumer and Other [Member] | Large Relationship Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
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 |  |  |  |  |  |
Consumer and Other [Member] | Policy Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
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 |  |  |  |  |  |
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 | 1,035 |  | 1,159 |  |  |
Consumer and Other [Member] | Adjustment for Recoveries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (6,842) |  | (6,812) |  |  |
Consumer and Other [Member] | General Macroeconomic Risk [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Unallocated [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 9,966 | 8,823 | 12,184 | 15,658 | 28,895 | 30,286
Unallocated [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Unallocated [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Unallocated [Member] | Environmental Risk Adjustment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Unallocated [Member] | Distressed Industries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Unallocated [Member] | Excessive Industry Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Unallocated [Member] | Large Relationship Concentrations [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Unallocated [Member] | Highly-Leveraged Credit Relationships [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Unallocated [Member] | Policy Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,190 |  | 2,466 |  |  |
Unallocated [Member] | Credit and Collateral Exceptions [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,707 |  | 1,635 |  |  |
Unallocated [Member] | Loans Not Reviewed by Concurrence [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Unallocated [Member] | Adjustment for Recoveries [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses |  |  |  |  |  |
Unallocated [Member] | General Macroeconomic Risk [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | $ 6,069 |  | $ 8,083 |  |  |

X
- 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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: 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 4: 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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