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Loans - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans 30-89 Days Past Due | $ 45,349 |  |
Loans 90 or More Days Past Due | 52,485 |  |
Total Past Due Loans | 97,834 |  |
Current Loans | 9,134,709 |  |
Total loans | 9,232,543 | 9,223,848 | 8,489,763
Accruing Loans 90 or More Days Past Due | 11,224 |  |
Commercial and industrial, Energy [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans 30-89 Days Past Due | 397 |  |
Loans 90 or More Days Past Due | 758 |  |
Total Past Due Loans | 1,155 |  |
Current Loans | 1,016,182 |  |
Total loans | 1,017,337 |  |
Accruing Loans 90 or More Days Past Due | 530 |  |
Commercial and industrial, Other commercial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans 30-89 Days Past Due | 13,841 |  |
Loans 90 or More Days Past Due | 18,173 |  |
Total Past Due Loans | 32,014 |  |
Current Loans | 3,723,266 |  |
Total loans | 3,755,280 |  |
Accruing Loans 90 or More Days Past Due | 6,570 |  |
Commercial real estate, Buildings, land and other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans 30-89 Days Past Due | 15,248 |  |
Loans 90 or More Days Past Due | 29,484 |  |
Total Past Due Loans | 44,732 |  |
Current Loans | 2,737,793 |  |
Total loans | 2,782,525 |  |
Accruing Loans 90 or More Days Past Due | 430 |  |
Commercial real estate, Construction [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans 30-89 Days Past Due | 5,771 |  |
Loans 90 or More Days Past Due | 81 |  |
Total Past Due Loans | 5,852 |  |
Current Loans | 582,891 |  |
Total loans | 588,743 |  |
Accruing Loans 90 or More Days Past Due | 81 |  |
Consumer Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans 30-89 Days Past Due | 5,989 |  |
Loans 90 or More Days Past Due | 3,504 |  |
Total Past Due Loans | 9,493 |  |
Current Loans | 775,712 |  |
Total loans | 785,205 |  |
Accruing Loans 90 or More Days Past Due | 3,205 |  |
Consumer and Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans 30-89 Days Past Due | 4,103 |  |
Loans 90 or More Days Past Due | 485 |  |
Total Past Due Loans | 4,588 |  |
Current Loans | 320,734 |  |
Total loans | 325,322 |  |
Accruing Loans 90 or More Days Past Due | 408 |  |
Unearned discounts [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans 30-89 Days Past Due |  |  |
Loans 90 or More Days Past Due |  |  |
Total Past Due Loans |  |  |
Current Loans | (21,869) |  |
Total loans | (21,869) |  |
Accruing Loans 90 or More Days Past Due |  |  |

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes 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 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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