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Note 9 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Loans | $ 19,023,822 | $ 18,254,024
Non-accrual loans | 77,330 | 68,854
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 14,750 | 81,012
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 20,672 | 8,921
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 1,924 | 11,580
Financial Asset, Past Due [Member] |  |
Loans | 114,676 | 170,367
Non-accrual loans | 77,330 | 68,854
Financial Asset, Not Past Due [Member] |  |
Loans | 18,909,146 | 18,083,657
Commercial Portfolio Segment [Member] |  |
Loans | 3,090,609 | 3,318,778
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 6,835 | 8,192
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 3,634 | 3,235
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 1,204 | 10,208
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 26,334 | 47,407
Non-accrual loans | 14,661 | 25,772
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 3,064,275 | 3,271,371
Real Estate Construction Portfolio Segment [Member] |  |
Loans | 474,294 | 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 | 16,992 | 0
Non-accrual loans | 16,992 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 457,302 | 559,372
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 9,511,805 | 8,793,685
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 3,246 | 25,772
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 6,357 | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 720 | 1,372
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 42,862 | 61,240
Non-accrual loans | 32,539 | 34,096
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 9,468,943 | 8,732,445
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 5,939,670 | 5,577,500
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 4,663 | 47,043
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 10,681 | 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 | 28,482 | 61,706
Non-accrual loans | 13,138 | 8,978
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 5,911,188 | 5,515,794
Installment and Other Loans [Member ] |  |
Loans | 7,444 | 4,689
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 6 | 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 | 6 | 14
Non-accrual loans | 0 | 8
Installment and Other Loans [Member ] | Financial Asset, Not Past Due [Member] |  |
Loans | $ 7,438 | $ 4,675

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