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Note 5 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Gross loans | $ 8,188,210 | $ 8,109,161
Nonaccrual | 56,059 | 44,454
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 660 | 1,965
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 2,830 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 0 | 5,591
Financial Asset, Past Due [Member] |  |
Gross loans | 59,549 | 52,010
Financial Asset, Not Past Due [Member] |  |
Gross loans | 8,128,661 | 8,057,151
Commercial Portfolio Segment [Member] |  |
Gross loans | 1,475,571 | 1,472,734
Nonaccrual | 22,159 | 25,257
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 433 | 306
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 1,979 | 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 | 24,571 | 25,563
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 1,451,000 | 1,447,171
Commercial Real Estate Portfolio Segment [Member] |  |
Gross loans | 5,837,539 | 5,795,228
Nonaccrual | 29,824 | 16,817
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 0 | 90
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 597 | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 0 | 5,591
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Gross loans | 30,421 | 22,498
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 5,807,118 | 5,772,730
Commercial Construction Portfolio Segment [Member] |  |
Gross loans | 622,748 | 574,139
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 | 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 | 0 | 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 622,748 | 574,139
Residential Portfolio Segment [Member] |  |
Gross loans | 251,416 | 264,748
Nonaccrual | 4,076 | 2,380
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 227 | 1,569
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 0 | 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 | 4,303 | 3,949
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 247,113 | 260,799
Consumer Portfolio Segment [Member] |  |
Gross loans | 936 | 2,312
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 | 254 | 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 | 254 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | $ 682 | $ 2,312

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