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Note 6 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Gross loans | $ 8,116,332 | $ 8,351,841
Nonaccrual | 51,300 | 52,524
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 5,119 | 1,357
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 7,870 | 23,826
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 3,165 | 0
Financial Asset, Past Due [Member] |  |
Gross loans | 67,454 | 77,707
Financial Asset, Not Past Due [Member] |  |
Gross loans | 8,048,878 | 8,274,134
Commercial Portfolio Segment [Member] |  |
Gross loans | 1,513,991 | 1,578,730
Nonaccrual | 12,693 | 12,827
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 5,047 | 555
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 0 | 0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 0 | 0
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Gross loans | 17,740 | 13,382
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 1,496,251 | 1,565,348
Commercial Real Estate Portfolio Segment [Member] |  |
Gross loans | 5,735,170 | 5,895,545
Nonaccrual | 33,219 | 36,192
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 0 | 527
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 7,870 | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 3,165 | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Gross loans | 44,254 | 36,719
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 5,690,916 | 5,858,826
Commercial Construction Portfolio Segment [Member] |  |
Gross loans | 616,087 | 620,496
Nonaccrual | 2,204 | 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 0 | 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 0 | 23,600
Commercial Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 0 | 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Gross loans | 2,204 | 23,600
Commercial Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 613,883 | 596,896
Residential Portfolio Segment [Member] |  |
Gross loans | 250,249 | 256,041
Nonaccrual | 3,184 | 3,505
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 0 | 275
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 0 | 226
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 0 | 0
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Gross loans | 3,184 | 4,006
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 247,065 | 252,035
Consumer Portfolio Segment [Member] |  |
Gross loans | 835 | 1,029
Nonaccrual | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 72 | 0
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Gross loans | 72 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | $ 763 | $ 1,029

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