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Note 5 - Loans and the Allowance for Credit Losses - Impairment Evaluation on Loans and Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Individually evaluated impairment |  | $ 13,911 |  | $ 16,217 |  |  |
Collectively evaluated impairment |  | 73,608 |  | 58,358 |  |  |
Total |  | 91,717 | $ 82,739 | 78,773 | $ 77,986 | $ 78,684 | $ 79,226
Individually evaluated impairment |  | 101,885 |  | 101,949 |  |  |
Collectively evaluated impairment |  | 7,797,493 |  | 6,722,164 |  |  |
Total |  | 7,910,013 |  | 6,838,351 |  |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |
Individually evaluated impairment |  | 4,198 |  | 4,198 |  |  |
Individually evaluated impairment |  | 10,635 |  | 14,238 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Individually evaluated impairment |  | 10,600 |  | 15,131 |  |  |
Collectively evaluated impairment |  | 16,812 |  | 8,561 |  |  |
Total |  | 29,689 | 28,135 | 25,969 | 27,336 | 25,567 | 28,443
Individually evaluated impairment |  | 29,482 |  | 33,726 |  |  |
Collectively evaluated impairment |  | 1,414,286 |  | 1,260,537 |  |  |
Total | [1] | 1,448,727 |  | 1,299,428 |  |  |
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |
Individually evaluated impairment |  | 2,277 |  | 2,277 |  |  |
Individually evaluated impairment |  | 4,959 |  | 5,165 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |
Individually evaluated impairment |  | 3,235 |  | 955 |  |  |
Collectively evaluated impairment |  | 49,370 |  | 42,713 |  |  |
Total |  | 54,526 | 47,562 | 45,589 | 43,342 | 43,815 | 39,330
Individually evaluated impairment |  | 59,042 |  | 49,310 |  |  |
Collectively evaluated impairment |  | 5,602,130 |  | 4,686,346 |  |  |
Total |  | 5,666,848 |  | 4,741,590 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |
Individually evaluated impairment |  | 1,921 |  | 1,921 |  |  |
Individually evaluated impairment |  | 5,676 |  | 5,934 |  |  |
Commercial Construction Portfolio Segment [Member] |  |  |  |  |  |  |
Individually evaluated impairment |  | 0 |  | 0 |  |  |
Collectively evaluated impairment |  | 3,444 |  | 3,580 |  |  |
Total |  | 3,444 | 3,413 | 3,580 | 3,702 | 4,927 | 8,194
Individually evaluated impairment |  | 7,727 |  | 13,196 |  |  |
Collectively evaluated impairment |  | 529,596 |  | 526,982 |  |  |
Total |  | 537,323 |  | 540,178 |  |  |
Commercial Construction Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |
Individually evaluated impairment |  | 0 |  | 0 |  |  |
Individually evaluated impairment |  | 0 |  | 0 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |  |
Individually evaluated impairment |  | 76 |  | 131 |  |  |
Collectively evaluated impairment |  | 3,977 |  | 3,497 |  |  |
Total |  | 4,053 | 3,625 | 3,628 | 3,598 | 4,366 | 2,687
Individually evaluated impairment |  | 5,634 |  | 5,717 |  |  |
Collectively evaluated impairment |  | 250,451 |  | 246,413 |  |  |
Total |  | 256,085 |  | 255,269 |  |  |
Residential Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |
Individually evaluated impairment |  | 0 |  | 0 |  |  |
Individually evaluated impairment |  | 0 |  | 3,139 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |
Individually evaluated impairment |  | 0 |  | 0 |  |  |
Collectively evaluated impairment |  | 5 |  | 7 |  |  |
Total |  | 5 | $ 4 | 7 | $ 8 | $ 9 | $ 4
Individually evaluated impairment |  | 0 |  | 0 |  |  |
Collectively evaluated impairment |  | 1,030 |  | 1,886 |  |  |
Total |  | 1,030 |  | 1,886 |  |  |
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |
Individually evaluated impairment |  | 0 |  | 0 |  |  |
Individually evaluated impairment |  | $ 0 |  | $ 0 |  |  |
[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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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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