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Note 5 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Gross loans | $ 8,156,217 | $ 8,109,161
Nonaccrual | 51,496 | 44,454
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 508 | 1,965
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 2,347 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 5,739 | 5,591
Financial Asset, Past Due [Member] |  |
Gross loans | 60,090 | 52,010
Financial Asset, Not Past Due [Member] |  |
Gross loans | 8,096,127 | 8,057,151
Commercial Portfolio Segment [Member] |  |
Gross loans | 1,472,795 | 1,472,734
Nonaccrual | 24,653 | 25,257
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 457 | 306
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 1,375 | 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 | 26,485 | 25,563
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 1,446,310 | 1,447,171
Commercial Real Estate Portfolio Segment [Member] |  |
Gross loans | 5,831,382 | 5,795,228
Nonaccrual | 23,529 | 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 | 534 | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Gross loans | 5,739 | 5,591
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Gross loans | 29,802 | 22,498
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 5,801,580 | 5,772,730
Commercial Construction Portfolio Segment [Member] |  |
Gross loans | 596,219 | 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 | 596,219 | 574,139
Residential Portfolio Segment [Member] |  |
Gross loans | 254,405 | 264,748
Nonaccrual | 3,314 | 2,380
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Gross loans | 51 | 1,569
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Gross loans | 438 | 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 | 3,803 | 3,949
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Gross loans | 250,602 | 260,799
Consumer Portfolio Segment [Member] |  |
Gross loans | 1,416 | 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 | 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 | $ 1,416 | $ 2,312

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