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Note 5 - Loans - Portfolio by Risk Rating (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Loans | $ 12,870,290 | $ 11,201,275
Loans held for sale | 8,000 | 7,500
Commercial Portfolio Segment [Member] |  |
Loans | 2,461,266 | 2,248,187
Real Estate Construction Portfolio Segment [Member] |  |
Loans | 678,805 | 548,088
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 6,482,695 | 5,785,248
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 3,242,354 | 2,615,759
Consumer Portfolio Segment [Member] |  |
Loans | 5,170 | 3,993
Pass [Member] |  |
Loans | 12,140,143 | 10,513,473
Loans held for sale |  |
Pass [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 2,281,698 | 2,023,114
Pass [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans | 616,411 | 469,909
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 6,004,258 | 5,410,623
Pass [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 3,232,606 | 2,605,834
Pass [Member] | Consumer Portfolio Segment [Member] |  |
Loans | 5,170 | 3,993
Special Mention [Member] |  |
Loans | 481,189 | 435,032
Loans held for sale |  |
Special Mention [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 118,056 | 140,682
Special Mention [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans | 54,209 | 44,129
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 308,924 | 250,221
Special Mention [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans |  |
Special Mention [Member] | Consumer Portfolio Segment [Member] |  |
Loans |  |
Substandard [Member] |  |
Loans | 248,949 | 252,672
Loans held for sale | 8,000 | 7,500
Substandard [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 61,503 | 84,293
Substandard [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans | 8,185 | 34,050
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 169,513 | 124,404
Substandard [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 9,748 | 9,925
Substandard [Member] | Consumer Portfolio Segment [Member] |  |
Loans |  |
Doubtful [Member] |  |
Loans | 9 | 98
Loans held for sale |  |
Doubtful [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 9 | 98
Doubtful [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans |  |
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans |  |
Doubtful [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans |  |
Doubtful [Member] | Consumer Portfolio Segment [Member] |  |
Loans |  |

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=82891408&loc=d3e4428-111522 + Details
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X
- 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=82891408&loc=d3e4428-111522 + Details
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