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Note 8 - Loans - Portfolio by Risk Rating (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loans | $ 15,651,848 | $ 15,644,396
Commercial Portfolio Segment [Member] |  |
Loans | 2,890,693 | 2,836,833
Real Estate Construction Portfolio Segment [Member] |  |
Loans | 677,816 | 679,492
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 7,549,522 | 7,555,027
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 4,530,521 | 4,569,944
Installment and Other Loans [Member ] |  |
Loans | $ 3,296 | 3,100
Pass [Member] |  |
Loans |  | 14,927,044
Pass [Member] | Commercial Portfolio Segment [Member] |  |
Loans |  | 2,581,128
Pass [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans |  | 593,196
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans |  | 7,202,568
Pass [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans |  | 4,547,052
Pass [Member] | Installment and Other Loans [Member ] |  |
Loans |  | 3,100
Special Mention [Member] |  |
Loans |  | 421,284
Special Mention [Member] | Commercial Portfolio Segment [Member] |  |
Loans |  | 141,344
Special Mention [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans |  | 82,010
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans |  | 186,283
Special Mention [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans |  | 11,647
Special Mention [Member] | Installment and Other Loans [Member ] |  |
Loans |  | 0
Substandard [Member] |  |
Loans |  | 290,495
Substandard [Member] | Commercial Portfolio Segment [Member] |  |
Loans |  | 108,788
Substandard [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans |  | 4,286
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans |  | 166,176
Substandard [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans |  | 11,245
Substandard [Member] | Installment and Other Loans [Member ] |  |
Loans |  | 0
Doubtful [Member] |  |
Loans |  | 5,573
Doubtful [Member] | Commercial Portfolio Segment [Member] |  |
Loans |  | 5,573
Doubtful [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans |  | 0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans |  | 0
Doubtful [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans |  | 0
Doubtful [Member] | Installment and Other Loans [Member ] |  |
Loans |  | $ 0

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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://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=121593590&loc=d3e4428-111522 + Details
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