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Note 8 - Loans (Details) - Portfolio by Risk Rating - USD ($) | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | $ 10,039,932,000 | $ 8,914,080,000
Loans held for sale | 0 | 973,000
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 9,586,395,000 | 8,483,654,000
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 217,985,000 | 153,589,000
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 224,422,000 | 274,498,000
Loans held for sale |  | 973,000
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 11,130,000 | 2,339,000
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,362,059,000 | 2,382,493,000
Commercial Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,201,557,000 | 2,260,474,000
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 92,219,000 | 47,619,000
Commercial Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 67,025,000 | 72,561,000
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,258,000 | 1,839,000
Real Estate Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 405,278,000 | 298,654,000
Real Estate Construction Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 381,972,000 | 272,927,000
Real Estate Construction Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,014,000 |
Real Estate Construction Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 21,792,000 | 25,227,000
Real Estate Construction Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 500,000 | 500,000
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 5,275,570,000 | 4,486,443,000
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 5,015,411,000 | 4,213,453,000
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 124,350,000 | 105,970,000
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 126,437,000 | 167,020,000
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 9,372,000 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,991,254,000 | 1,742,938,000
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,981,684,000 | 1,733,248,000
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 402,000 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 9,168,000 | 9,690,000
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 5,771,000 | 3,552,000
Consumer Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | $ 5,771,000 | $ 3,552,000

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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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- Definition Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + 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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