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Note 8 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loans | $ 15,976,781 | $ 15,644,396
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 15,857 | 118,402
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 4,777 | 25,474
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 4,333 | 4,982
Financial Asset, Past Due [Member] |  |
Loans | 93,649 | 216,542
Non-accrual loans | 68,682 | 67,684
Financial Asset, Not Past Due [Member] |  |
Loans | 15,883,132 | 15,427,854
Commercial Portfolio Segment [Member] |  |
Loans | 2,871,693 | 2,836,833
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 15,391 | 52,601
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 2,326 | 3,182
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 2,861 | 2,947
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 37,676 | 81,817
Non-accrual loans | 17,098 | 23,087
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 2,834,017 | 2,755,016
Real Estate Construction Portfolio Segment [Member] |  |
Loans | 688,195 | 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 | 5,491 | 10,543
Non-accrual loans | 5,491 | 4,286
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 682,704 | 668,949
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 7,835,528 | 7,555,027
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 458 | 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 | 1,472 | 2,035
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 38,898 | 99,005
Non-accrual loans | 36,968 | 33,715
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 7,796,630 | 7,456,022
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 4,577,995 | 4,569,944
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 0 | 14,315
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 2,451 | 4,223
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 0 | 0
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 11,576 | 25,134
Non-accrual loans | 9,125 | 6,596
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 4,566,419 | 4,544,810
Installment and Other Loans [Member ] |  |
Loans | 3,370 | 3,100
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 8 | 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 | 8 | 43
Non-accrual loans | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, Not Past Due [Member] |  |
Loans | $ 3,362 | $ 3,057

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