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Note 6 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Gross loans | $ 8,206,343 | $ 8,280,482
Nonaccrual | 49,860 | 57,310
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 14,829 | 3,331
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 133 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 0 | 0
Financial Asset, Past Due [Member] |  |
Gross loans | 64,822 | 60,641
Financial Asset, Not Past Due [Member] |  |
Gross loans | 8,141,521 | 8,219,841
Commercial Portfolio Segment [Member] |  |
Gross loans | 1,492,920 | 1,532,730
Nonaccrual | 16,181 | 16,231
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 4,915 | 1,340
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 | 21,096 | 17,571
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 1,471,824 | 1,515,159
Commercial Real Estate Portfolio Segment [Member] |  |
Gross loans | 5,837,671 | 5,880,679
Nonaccrual | 29,109 | 36,486
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 8,740 | 0
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 | 37,849 | 36,486
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 5,799,822 | 5,844,193
Commercial Construction Portfolio Segment [Member] |  |
Gross loans | 617,593 | 616,246
Nonaccrual | 2,204 | 2,204
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 | 0
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 | 2,204
Commercial Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 615,389 | 614,042
Residential Portfolio Segment [Member] |  |
Gross loans | 256,555 | 249,691
Nonaccrual | 2,366 | 2,389
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 1,174 | 1,991
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 133 | 0
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 | 3,673 | 4,380
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 252,882 | 245,311
Consumer Portfolio Segment [Member] |  |
Gross loans | 1,604 | 1,136
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 | $ 1,604 | $ 1,136

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