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Note 5 - Loans (Details) - Portfolio by Risk Rating - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | $ 10,163,452 | $ 8,914,080
Loans held for sale | 6,676 | 973
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 9,669,161 | 8,483,654
Loans held for sale | 732 |
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 272,066 | 153,589
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 210,497 | 274,498
Loans held for sale | 5,944 | 973
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 11,728 | 2,339
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,316,863 | 2,382,493
Commercial Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,143,270 | 2,260,474
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 110,338 | 47,619
Commercial Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 61,297 | 72,561
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,958 | 1,839
Real Estate Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 441,543 | 298,654
Real Estate Construction Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 413,765 | 272,927
Real Estate Construction Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 5,776 |
Real Estate Construction Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 21,502 | 25,227
Real Estate Construction Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 500 | 500
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 5,301,218 | 4,486,443
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 5,018,199 | 4,213,453
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 155,553 | 105,970
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 118,196 | 167,020
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 9,270 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,101,335 | 1,742,938
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,091,434 | 1,733,248
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 399 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 9,502 | 9,690
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,493 | 3,552
Consumer Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | $ 2,493 | $ 3,552

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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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