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Note 4 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Loans | $ 19,375,955 | $ 19,548,140
Non-accrual loans | 169,161 | 66,681
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 86,041 | 124,698
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 20,860 | 38,941
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 4,050 | 7,157
Financial Asset, Past Due [Member] |  |
Loans | 280,112 | 237,477
Non-accrual loans | 169,161 | 66,681
Financial Asset, Not Past Due [Member] |  |
Loans | 19,095,843 | 19,310,663
Commercial Portfolio Segment [Member] |  |
Loans | 3,098,004 | 3,305,048
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 25,164 | 11,771
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 275 | 7,770
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 2,590 | 508
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 87,796 | 34,453
Non-accrual loans | 59,767 | 14,404
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 3,010,208 | 3,270,595
Real Estate Construction Portfolio Segment [Member] |  |
Loans | 319,649 | 422,647
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 5,334 | 25,389
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 0 | 22,998
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 | 5,334 | 56,123
Non-accrual loans | 0 | 7,736
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 314,315 | 366,524
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 10,033,830 | 9,729,581
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 16,525 | 27,900
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 13,934 | 1,503
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 1,460 | 6,649
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Loans | 115,047 | 68,082
Non-accrual loans | 83,128 | 32,030
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 9,918,783 | 9,661,499
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 5,919,092 | 6,084,666
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 39,018 | 59,606
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 6,651 | 6,670
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 | 71,935 | 78,787
Non-accrual loans | 26,266 | 12,511
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Loans | 5,847,157 | 6,005,879
Installment and Other Loans [Member ] |  |
Loans | 5,380 | 6,198
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 0 | 32
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 | 0 | 32
Non-accrual loans | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, Not Past Due [Member] |  |
Loans | $ 5,380 | $ 6,166

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