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Note 5 - Loans (Details) - Portfolio by Risk Rating (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | $ 8,084,563 | $ 7,429,147 | $ 7,059,212
Commercial Loans Member | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 2,108,191 | 1,944,989 |
Commercial Loans Member | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 84,786 | 76,776 |
Commercial Loans Member | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 102,088 | 94,077 |
Commercial Loans Member | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 3,659 | 11,265 |
Commercial Loans Member | Total [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 2,298,724 | 2,127,107 |
Commercial Loans Member |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 2,298,724 | 2,127,107 |
Real Estate Construction Loans [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 184,449 | 109,269 |
Real Estate Construction Loans [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans |  | 18,000 |
Real Estate Construction Loans [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 33,939 | 45,171 |
Real Estate Construction Loans [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 3,313 | 8,510 |
Real Estate Construction Loans [Member] | Total [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 221,701 | 180,950 |
Real Estate Construction Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 221,701 | 180,950 | 237,372
Commercial Mortgage Loans [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 3,686,788 | 3,344,783 |
Commercial Mortgage Loans [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 127,436 | 162,455 |
Commercial Mortgage Loans [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 208,827 | 261,214 |
Commercial Mortgage Loans [Member] | Total [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 4,023,051 | 3,768,452 |
Commercial Mortgage Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 4,023,051 | 3,768,452 | 3,748,897
Residential Mortgage And Equity Lines Member | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 1,510,647 | 1,322,768 |
Residential Mortgage And Equity Lines Member | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans |  | 816 |
Residential Mortgage And Equity Lines Member | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 15,885 | 16,084 |
Residential Mortgage And Equity Lines Member | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans |  | 414 |
Residential Mortgage And Equity Lines Member | Total [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 1,526,532 | 1,340,082 |
Residential Mortgage And Equity Lines Member |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 1,526,532 | 1,340,082 | 1,186,969
Installment And Other Loans Member | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 14,555 | 12,556 |
Installment And Other Loans Member | Total [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 14,555 | 12,556 |
Installment And Other Loans Member |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 14,555 | 12,556 |
Total [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 7,504,630 | 6,734,365 |
Total [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 212,222 | 258,047 |
Total [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 360,739 | 416,546 |
Total [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 6,972 | 20,189 |
Total [Member] | Total [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | 8,084,563 | 7,429,147 |
Total [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Gross Loans | $ 8,084,563 | $ 7,429,147 |

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- 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=28367877&loc=d3e4428-111522 + Details
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