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Note 5 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Gross loans | $ 8,304,101 | $ 8,351,841
Real Estate [Member] |  |
Gross loans | 35,742 | 59,576
Other Collateral Pledged [Member] |  |
Gross loans | 10,280 | 10,387
Collateral Pledged [Member] |  |
Gross loans | 46,022 | 69,963
Commercial Portfolio Segment [Member] |  |
Gross loans | 1,572,494 | 1,578,730
Commercial Portfolio Segment [Member] | Real Estate [Member] |  |
Gross loans | 1,700 | 4,949
Commercial Portfolio Segment [Member] | Other Collateral Pledged [Member] |  |
Gross loans | 10,280 | 10,387
Commercial Portfolio Segment [Member] | Collateral Pledged [Member] |  |
Gross loans | 11,980 | 15,336
Commercial Real Estate Portfolio Segment [Member] |  |
Gross loans | 5,829,950 | 5,895,545
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] |  |
Gross loans | 33,210 | 39,986
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 | 33,210 | 39,986
Commercial Construction Portfolio Segment [Member] |  |
Gross loans | 646,593 | 620,496
Commercial Construction Portfolio Segment [Member] | Real Estate [Member] |  |
Gross loans | 0 | 8,700
Commercial Construction Portfolio Segment [Member] | Other Collateral Pledged [Member] |  |
Gross loans | 0 | 0
Commercial Construction Portfolio Segment [Member] | Collateral Pledged [Member] |  |
Gross loans | 0 | 8,700
Residential Portfolio Segment [Member] |  |
Gross loans | 254,214 | 256,041
Residential Portfolio Segment [Member] | Real Estate [Member] |  |
Gross loans | 832 | 5,941
Residential Portfolio Segment [Member] | Other Collateral Pledged [Member] |  |
Gross loans | 0 | 0
Residential Portfolio Segment [Member] | Collateral Pledged [Member] |  |
Gross loans | $ 832 | $ 5,941

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