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Note 8 - Loans - Portfolio by Risk Rating (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Loans | $ 13,647,646 | $ 12,870,290
Loans held for sale |  | 8,000
Commercial Portfolio Segment [Member] |  |
Loans | 2,674,089 | 2,461,266
Real Estate Construction Portfolio Segment [Member] |  |
Loans | 597,018 | 678,805
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 6,580,254 | 6,482,695
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 3,790,710 | 3,242,354
Consumer Portfolio Segment [Member] |  |
Loans | 5,575 | 5,170
Pass [Member] |  |
Loans | 12,995,238 | 12,140,143
Loans held for sale |  |
Pass [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 2,494,780 | 2,281,698
Pass [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans | 531,579 | 616,411
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 6,181,227 | 6,004,258
Pass [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 3,782,077 | 3,232,606
Pass [Member] | Consumer Portfolio Segment [Member] |  |
Loans | 5,575 | 5,170
Special Mention [Member] |  |
Loans | 500,900 | 481,189
Loans held for sale |  |
Special Mention [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 125,373 | 118,056
Special Mention [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans | 60,517 | 54,209
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 315,010 | 308,924
Special Mention [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans |  |
Special Mention [Member] | Consumer Portfolio Segment [Member] |  |
Loans |  |
Substandard [Member] |  |
Loans | 151,508 | 248,949
Loans held for sale |  | 8,000
Substandard [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 53,936 | 61,503
Substandard [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans | 4,922 | 8,185
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 84,017 | 169,513
Substandard [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 8,633 | 9,748
Substandard [Member] | Consumer Portfolio Segment [Member] |  |
Loans |  |
Doubtful [Member] |  |
Loans |  | 9
Loans held for sale |  |
Doubtful [Member] | Commercial Portfolio Segment [Member] |  |
Loans |  | 9
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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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