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Note 5 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Loans | $ 19,548,140 | $ 18,254,024
Non-accrual loans | 66,681 | 68,854
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 124,698 | 81,012
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 38,941 | 8,921
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 7,157 | 11,580
Financial Asset, Past Due [Member] |  |
Loans | 237,477 | 170,367
Non-accrual loans | 66,681 | 68,854
Financial Asset, Not Past Due [Member] |  |
Loans | 19,310,663 | 18,083,657
Commercial Portfolio Segment [Member] |  |
Loans | 3,305,048 | 3,318,778
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 11,771 | 8,192
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 7,770 | 3,235
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 508 | 10,208
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 34,453 | 47,407
Non-accrual loans | 14,404 | 25,772
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 3,270,595 | 3,271,371
Real Estate Construction Portfolio Segment [Member] |  |
Loans | 422,647 | 559,372
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 25,389 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 22,998 | 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 | 56,123 | 0
Non-accrual loans | 7,736 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 366,524 | 559,372
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 9,729,581 | 8,793,685
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 27,900 | 25,772
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 1,503 | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 6,649 | 1,372
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 68,082 | 61,240
Non-accrual loans | 32,030 | 34,096
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 9,661,499 | 8,732,445
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 6,084,666 | 5,577,500
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 59,606 | 47,043
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 6,670 | 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 | 78,787 | 61,706
Non-accrual loans | 12,511 | 8,978
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 6,005,879 | 5,515,794
Installment and Other Loans [Member ] |  |
Loans | 6,198 | 4,689
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 32 | 5
Installment and Other Loans [Member ] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 0 | 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 | 32 | 14
Non-accrual loans | 0 | 8
Installment and Other Loans [Member ] | Financial Asset, Not Past Due [Member] |  |
Loans | $ 6,166 | $ 4,675

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