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Note 5 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Loans and Leases Receivable, Gross |  | $ 7,910,013 | $ 6,838,351
Nonaccrual |  | 57,447 | 61,700
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 842 | 7,364
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 13 | 2,030
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 10,068 | 13,531
Financial Asset, Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 68,370 | 84,625
Financial Asset, Not Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 7,841,643 | 6,753,726
Commercial Portfolio Segment [Member] |  |  |
Loans and Leases Receivable, Gross | [1] | 1,448,727 | 1,299,428
Nonaccrual |  | 26,858 | 30,062
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 171 | 4,305
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 13 | 729
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 4,392 | 4,457
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 31,434 | 39,553
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 1,417,293 | 1,259,875
Commercial Real Estate Portfolio Segment [Member] |  |  |
Loans and Leases Receivable, Gross |  | 5,666,848 | 4,741,590
Nonaccrual |  | 28,138 | 25,393
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 1,622
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 1,009
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 5,676 | 5,935
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 33,814 | 33,959
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 5,633,034 | 4,707,631
Commercial Construction Portfolio Segment [Member] |  |  |
Loans and Leases Receivable, Gross |  | 537,323 | 540,178
Nonaccrual |  | 0 | 3,150
Commercial Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 3,150
Commercial Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 537,323 | 537,028
Residential Portfolio Segment [Member] |  |  |
Loans and Leases Receivable, Gross |  | 256,085 | 255,269
Nonaccrual |  | 2,451 | 3,095
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 671 | 1,437
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 292
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 3,139
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 3,122 | 7,963
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 252,963 | 247,306
Consumer Portfolio Segment [Member] |  |  |
Loans and Leases Receivable, Gross |  | 1,030 | 1,886
Nonaccrual |  | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | 0 | 0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Loans and Leases Receivable, Gross |  | $ 1,030 | $ 1,886
[1] | Includes PPP loans of $11.5 million and $93.1 million as of September 30, 2022 and December 31, 2021 , respectively.

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