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Note 5 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Gross loans | $ 8,188,210 | $ 8,109,161
Real Estate [Member] |  |
Gross loans | 61,982 | 71,925
Other Collateral Pledged [Member] |  |
Gross loans | 14,719 | 22,517
Collateral Pledged [Member] |  |
Gross loans | 76,701 | 94,442
Commercial Portfolio Segment [Member] |  |
Gross loans | 1,475,571 | 1,472,734
Commercial Portfolio Segment [Member] | Real Estate [Member] |  |
Gross loans | 4,891 | 5,352
Commercial Portfolio Segment [Member] | Other Collateral Pledged [Member] |  |
Gross loans | 14,719 | 22,517
Commercial Portfolio Segment [Member] | Collateral Pledged [Member] |  |
Gross loans | 19,610 | 27,869
Commercial Real Estate Portfolio Segment [Member] |  |
Gross loans | 5,837,539 | 5,795,228
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] |  |
Gross loans | 41,636 | 52,477
Commercial Real Estate Portfolio Segment [Member] | Other Collateral Pledged [Member] |  |
Gross loans | 0 | 0
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] |  |
Gross loans | 41,636 | 52,477
Commercial Construction Portfolio Segment [Member] |  |
Gross loans | 622,748 | 574,139
Commercial Construction Portfolio Segment [Member] | Real Estate [Member] |  |
Gross loans | 8,700 | 8,232
Commercial Construction Portfolio Segment [Member] | Other Collateral Pledged [Member] |  |
Gross loans | 0 | 0
Commercial Construction Portfolio Segment [Member] | Collateral Pledged [Member] |  |
Gross loans | 8,700 | 8,232
Residential Portfolio Segment [Member] |  |
Gross loans | 251,416 | 264,748
Residential Portfolio Segment [Member] | Real Estate [Member] |  |
Gross loans | 6,755 | 5,864
Residential Portfolio Segment [Member] | Other Collateral Pledged [Member] |  |
Gross loans | 0 | 0
Residential Portfolio Segment [Member] | Collateral Pledged [Member] |  |
Gross loans | $ 6,755 | $ 5,864

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