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Note 8 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loans | $ 15,690,689 | $ 15,644,396
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 18,826 | 118,402
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 2,899 | 25,474
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 1,513 | 4,982
Financial Asset, Past Due [Member] |  |
Loans | 91,020 | 216,542
Non-accrual loans | 67,782 | 67,684
Financial Asset, Not Past Due [Member] |  |
Loans | 15,599,669 | 15,427,854
Commercial Portfolio Segment [Member] |  |
Loans | 2,867,437 | 2,836,833
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 17,010 | 52,601
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 599 | 3,182
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 1,249 | 2,947
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 35,191 | 81,817
Non-accrual loans | 16,333 | 23,087
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 2,832,246 | 2,755,016
Real Estate Construction Portfolio Segment [Member] |  |
Loans | 664,495 | 679,492
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 0 | 6,257
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 0 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 0 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 4,116 | 10,543
Non-accrual loans | 4,116 | 4,286
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 660,379 | 668,949
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 7,615,088 | 7,555,027
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 228 | 45,186
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 0 | 18,069
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 0 | 2,035
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 37,112 | 99,005
Non-accrual loans | 36,884 | 33,715
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 7,577,976 | 7,456,022
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 4,540,537 | 4,569,944
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 588 | 14,315
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 2,300 | 4,223
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 264 | 0
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 13,601 | 25,134
Non-accrual loans | 10,449 | 6,596
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 4,526,936 | 4,544,810
Installment and Other Loans [Member ] |  |
Loans | 3,132 | 3,100
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 1,000 | 43
Installment and Other Loans [Member ] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, Past Due [Member] |  |
Loans | 1,000 | 43
Non-accrual loans | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, Not Past Due [Member] |  |
Loans | $ 2,132 | $ 3,057

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