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Note 5 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Gross loans | $ 8,304,101 | $ 8,351,841
Nonaccrual | 47,438 | 52,524
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 3,061 | 1,357
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 0 | 23,826
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 23,600 | 0
Financial Asset, Past Due [Member] |  |
Gross loans | 74,099 | 77,707
Financial Asset, Not Past Due [Member] |  |
Gross loans | 8,230,002 | 8,274,134
Commercial Portfolio Segment [Member] |  |
Gross loans | 1,572,494 | 1,578,730
Nonaccrual | 12,640 | 12,827
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 495 | 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 | 13,135 | 13,382
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 1,559,359 | 1,565,348
Commercial Real Estate Portfolio Segment [Member] |  |
Gross loans | 5,829,950 | 5,895,545
Nonaccrual | 33,275 | 36,192
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 525 | 527
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 0 | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 0 | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Gross loans | 33,800 | 36,719
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 5,796,150 | 5,858,826
Commercial Construction Portfolio Segment [Member] |  |
Gross loans | 646,593 | 620,496
Nonaccrual | 0 | 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 | 23,600 | 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Gross loans | 23,600 | 23,600
Commercial Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 622,993 | 596,896
Residential Portfolio Segment [Member] |  |
Gross loans | 254,214 | 256,041
Nonaccrual | 1,523 | 3,505
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 1,942 | 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 | 3,465 | 4,006
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 250,749 | 252,035
Consumer Portfolio Segment [Member] |  |
Gross loans | 850 | 1,029
Nonaccrual | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 99 | 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 | 99 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | $ 751 | $ 1,029

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