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Note 9 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Loans | $ 18,317,339 | $ 18,254,024
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 59,500 | 81,012
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 282 | 8,921
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 12,756 | 11,580
Financial Asset, Past Due [Member] |  |
Loans | 146,118 | 170,367
Non-accrual loans | 73,580 | 68,854
Financial Asset, Not Past Due [Member] |  |
Loans | 18,171,221 | 18,083,657
Commercial Portfolio Segment [Member] |  |
Loans | 3,153,039 | 3,318,778
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 7,623 | 8,192
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 272 | 3,235
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 100 | 10,208
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 30,074 | 47,407
Non-accrual loans | 22,079 | 25,772
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 3,122,965 | 3,271,371
Real Estate Construction Portfolio Segment [Member] |  |
Loans | 558,967 | 559,372
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 0 | 0
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 | 0 | 0
Non-accrual loans | 0 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 558,967 | 559,372
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 8,916,766 | 8,793,685
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 19,870 | 25,772
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 0 | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 12,656 | 1,372
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 72,744 | 61,240
Non-accrual loans | 40,218 | 34,096
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 8,844,022 | 8,732,445
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 5,682,850 | 5,577,500
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 31,998 | 47,043
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 0 | 5,685
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 | 43,281 | 61,706
Non-accrual loans | 11,283 | 8,978
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 5,639,569 | 5,515,794
Installment and Other Loans [Member ] |  |
Loans | 5,717 | 4,689
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 9 | 5
Installment and Other Loans [Member ] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 10 | 1
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 | 19 | 14
Non-accrual loans | 0 | 8
Installment and Other Loans [Member ] | Financial Asset, Not Past Due [Member] |  |
Loans | $ 5,698 | $ 4,675

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