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Note 9 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Loans | $ 18,952,794 | $ 18,254,024
Non-accrual loans | 69,004 | 68,854
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 14,467 | 81,012
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 12,535 | 8,921
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 5,968 | 11,580
Financial Asset, Past Due [Member] |  |
Loans | 101,974 | 170,367
Non-accrual loans | 69,004 | 68,854
Financial Asset, Not Past Due [Member] |  |
Loans | 18,850,820 | 18,083,657
Commercial Portfolio Segment [Member] |  |
Loans | 3,317,868 | 3,318,778
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 1,767 | 8,192
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 1,033 | 3,235
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 194 | 10,208
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 20,568 | 47,407
Non-accrual loans | 17,574 | 25,772
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 3,297,300 | 3,271,371
Real Estate Construction Portfolio Segment [Member] |  |
Loans | 521,673 | 559,372
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 9,255 | 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 | 9,255 | 0
Non-accrual loans | 0 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 512,418 | 559,372
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 9,293,475 | 8,793,685
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 1,591 | 25,772
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 3,793 | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 5,774 | 1,372
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 50,716 | 61,240
Non-accrual loans | 39,558 | 34,096
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 9,242,759 | 8,732,445
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 5,814,521 | 5,577,500
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 1,854 | 47,043
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 7,701 | 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 | 21,427 | 61,706
Non-accrual loans | 11,872 | 8,978
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 5,793,094 | 5,515,794
Installment and Other Loans [Member ] |  |
Loans | 5,257 | 4,689
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 0 | 5
Installment and Other Loans [Member ] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 8 | 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 | 8 | 14
Non-accrual loans | 0 | 8
Installment and Other Loans [Member ] | Financial Asset, Not Past Due [Member] |  |
Loans | $ 5,249 | $ 4,675

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