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Note 4 - Loans and the Allowance for Credit Losses - Analysis of Aging of 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
Nonaccrual |  | 44,454 | 61,700
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 1,965 | 7,364
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 2,030
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 5,591 | 13,531
Financial Asset, Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 52,010 | 84,625
Financial Asset, Not Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 8,057,151 | 6,753,726
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process | [1] | 1,472,734 | 1,299,428
Nonaccrual |  | 25,257 | 30,062
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 306 | 4,305
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 729
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 4,457
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 25,563 | 39,553
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 1,447,171 | 1,259,875
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 5,795,228 | 4,741,590
Nonaccrual |  | 16,817 | 25,393
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 90 | 1,622
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 1,009
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 5,591 | 5,935
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 22,498 | 33,959
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 5,772,730 | 4,707,631
Commercial Construction Portfolio Segment [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 574,139 | 540,178
Nonaccrual |  | 0 | 3,150
Commercial Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 3,150
Commercial Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 574,139 | 537,028
Residential Portfolio Segment [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 264,748 | 255,269
Nonaccrual |  | 2,380 | 3,095
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 1,569 | 1,437
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 292
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 3,139
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 3,949 | 7,963
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 260,799 | 247,306
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 2,312 | 1,886
Nonaccrual |  | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process |  | $ 2,312 | $ 1,886
[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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