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Note 4 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | $ 8,109,161 | $ 6,838,351
Real Estate [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 71,925 | 83,681
Other Collateral Pledged [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 22,517 | 26,182
Collateral Pledged [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 94,442 | 109,863
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process | [1] | 1,472,734 | 1,299,428
Commercial Portfolio Segment [Member] | Real Estate [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 5,352 | 6,385
Commercial Portfolio Segment [Member] | Other Collateral Pledged [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 22,517 | 26,182
Commercial Portfolio Segment [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 27,869 | 32,567
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 5,795,228 | 4,741,590
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 52,477 | 55,244
Commercial Real Estate Portfolio Segment [Member] | Other Collateral Pledged [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 0
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 52,477 | 55,244
Commercial Construction Portfolio Segment [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 574,139 | 540,178
Commercial Construction Portfolio Segment [Member] | Real Estate [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 8,232 | 13,196
Commercial Construction Portfolio Segment [Member] | Other Collateral Pledged [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 0
Commercial Construction Portfolio Segment [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 8,232 | 13,196
Residential Portfolio Segment [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 264,748 | 255,269
Residential Portfolio Segment [Member] | Real Estate [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 5,864 | 8,856
Residential Portfolio Segment [Member] | Other Collateral Pledged [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 0
Residential Portfolio Segment [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | $ 5,864 | $ 8,856
[1] | Included in commercial loans as of December 31, 2022 and December 31, 2021 were Paycheck Protection Program (“PPP”) loans of $11.4 million and $93.1 million, respectively. These loans are 100% federally guaranteed and currently not subject to any allocation of allowance for credit losses.

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