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Note 7 - Loans (Detail) - Portfolio by Risk Rating (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Gross Loans | $ 7,364,340 | $ 7,429,147
Pass [Member] | Commercial Loans Member |  |
Gross Loans | 1,870,832 | 1,944,989
Pass [Member] | Real Estate Construction Loans [Member] |  |
Gross Loans | 120,395 | 109,269
Pass [Member] | Commercial Mortgage Loans [Member] |  |
Gross Loans | 3,360,744 | 3,344,783
Pass [Member] | Residential Mortgage And Equity Lines Member |  |
Gross Loans | 1,358,500 | 1,322,768
Pass [Member] | Installment And Other Loans Member |  |
Gross Loans | 13,982 | 12,556
Pass [Member] | Total [Member] |  |
Gross Loans | 6,724,453 | 6,734,365
Special Mention [Member] | Commercial Loans Member |  |
Gross Loans | 72,872 | 76,776
Special Mention [Member] | Real Estate Construction Loans [Member] |  |
Gross Loans | 17,692 | 18,000
Special Mention [Member] | Commercial Mortgage Loans [Member] |  |
Gross Loans | 148,987 | 162,455
Special Mention [Member] | Residential Mortgage And Equity Lines Member |  |
Gross Loans | 1,915 | 816
Special Mention [Member] | Installment And Other Loans Member |  |
Gross Loans | 0 | 0
Special Mention [Member] | Total [Member] |  |
Gross Loans | 241,466 | 258,047
Substandard [Member] | Commercial Loans Member |  |
Gross Loans | 82,957 | 94,077
Substandard [Member] | Real Estate Construction Loans [Member] |  |
Gross Loans | 37,212 | 45,171
Substandard [Member] | Commercial Mortgage Loans [Member] |  |
Gross Loans | 249,608 | 261,214
Substandard [Member] | Residential Mortgage And Equity Lines Member |  |
Gross Loans | 14,106 | 16,084
Substandard [Member] | Installment And Other Loans Member |  |
Gross Loans | 0 | 0
Substandard [Member] | Total [Member] |  |
Gross Loans | 383,883 | 416,546
Doubtful [Member] | Commercial Loans Member |  |
Gross Loans | 5,128 | 11,265
Doubtful [Member] | Real Estate Construction Loans [Member] |  |
Gross Loans | 8,768 | 8,510
Doubtful [Member] | Commercial Mortgage Loans [Member] |  |
Gross Loans | 241 | 0
Doubtful [Member] | Residential Mortgage And Equity Lines Member |  |
Gross Loans | 401 | 414
Doubtful [Member] | Installment And Other Loans Member |  |
Gross Loans | 0 | 0
Doubtful [Member] | Total [Member] |  |
Gross Loans | 14,538 | 20,189
Total [Member] | Commercial Loans Member |  |
Gross Loans | 2,031,789 | 2,127,107
Total [Member] | Real Estate Construction Loans [Member] |  |
Gross Loans | 184,067 | 180,950
Total [Member] | Commercial Mortgage Loans [Member] |  |
Gross Loans | 3,759,580 | 3,768,452
Total [Member] | Residential Mortgage And Equity Lines Member |  |
Gross Loans | 1,374,922 | 1,340,082
Total [Member] | Installment And Other Loans Member |  |
Gross Loans | 13,982 | 12,556
Total [Member] | Total [Member] |  |
Gross Loans | 7,364,340 | 7,429,147
Commercial Loans Member |  |
Gross Loans | 2,031,789 | 2,127,107
Real Estate Construction Loans [Member] |  |
Gross Loans | 184,067 | 180,950
Commercial Mortgage Loans [Member] |  |
Gross Loans | 3,759,580 | 3,768,452
Residential Mortgage And Equity Lines Member |  |
Gross Loans | 1,374,922 | 1,340,082
Installment And Other Loans Member |  |
Gross Loans | 13,982 | 12,556
Total [Member] |  |
Gross Loans | $ 7,364,340 | $ 7,429,147

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant