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Note 5 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Gross loans | $ 8,280,482 | $ 8,351,841
Nonaccrual | 57,310 | 52,524
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 3,331 | 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 | 0 | 0
Financial Asset, Past Due [Member] |  |
Gross loans | 60,641 | 77,707
Financial Asset, Not Past Due [Member] |  |
Gross loans | 8,219,841 | 8,274,134
Commercial Portfolio Segment [Member] |  |
Gross loans | 1,532,730 | 1,578,730
Nonaccrual | 16,231 | 12,827
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 1,340 | 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 | 17,571 | 13,382
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 1,515,159 | 1,565,348
Commercial Real Estate Portfolio Segment [Member] |  |
Gross loans | 5,880,679 | 5,895,545
Nonaccrual | 36,486 | 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 | 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 | 36,486 | 36,719
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 5,844,193 | 5,858,826
Commercial Construction Portfolio Segment [Member] |  |
Gross loans | 616,246 | 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 | 614,042 | 596,896
Residential Portfolio Segment [Member] |  |
Gross loans | 249,691 | 256,041
Nonaccrual | 2,389 | 3,505
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 1,991 | 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 | 4,380 | 4,006
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 245,311 | 252,035
Consumer Portfolio Segment [Member] |  |
Gross loans | 1,136 | 1,029
Nonaccrual | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 0 | 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 | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | $ 1,136 | $ 1,029

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