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Note 7 - Loans (Details) - Portfolio by Risk Rating (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | $ 8,858,254 | $ 8,084,563
Commercial Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,283,837 | 2,108,191
Commercial Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 82,731 | 84,786
Commercial Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 80,180 | 102,088
Commercial Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 3,370 | 3,659
Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,450,118 | 2,298,724
Real Estate Construction Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 267,760 | 184,449
Real Estate Construction Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 32,199 | 33,939
Real Estate Construction Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,500 | 3,313
Real Estate Construction Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 301,459 | 221,701
Commercial Mortgage Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 4,124,943 | 3,686,788
Commercial Mortgage Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 112,825 | 127,436
Commercial Mortgage Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 176,299 | 208,827
Commercial Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 4,414,067 | 4,023,051
Residential Mortgage And Equity Lines Member | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,679,920 | 1,510,647
Residential Mortgage And Equity Lines Member | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 9,014 | 15,885
Residential Mortgage And Equity Lines Member |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,688,934 | 1,526,532
Installment And Other Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 3,676 | 14,555
Installment And Other Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 3,676 | 14,555
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 8,360,136 | 7,504,630
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 195,556 | 212,222
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 297,692 | 360,739
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | $ 4,870 | $ 6,972

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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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