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Note 1 - Summary of Significant Accounting Policies - Impact of Adoption of Accounting Policy (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Allowance for credit losses on loans |  | $ 51,920 | $ 36,647 | $ 26,791
Total allowance for credit losses on off-balance sheet exposures |  |  | 3,850 | 350
Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | 9,856 |
Total allowance for credit losses on off-balance sheet exposures | [1] |  | 3,500 |
Home Equity Line of Credit [Member] |  |  |  |
Allowance for credit losses on loans |  | 895 | 842 | 728
Home Equity Line of Credit [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | 114 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Allowance for credit losses on loans |  | 26,379 | 14,552 | 8,562
Commercial Real Estate Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | 5,990 |
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] |  |  |  |
Allowance for credit losses on loans |  | 19,396 | 8,333 | 5,235
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | 3,098 |
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] |  |  |  |
Allowance for credit losses on loans |  | 6,983 | 6,219 | 3,327
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | 2,892 |
Commercial and Industrial Portfolio Segment [Member] | Term, Excluding PPP [Member] |  |  |  |
Allowance for credit losses on loans |  |  | 7,147 | 6,782
Commercial and Industrial Portfolio Segment [Member] | Term, Excluding PPP [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | 365 |
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] |  |  |  |
Allowance for credit losses on loans |  | 3,614 | 4,129 | 5,657
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | (1,528) |
Total Commercial and Industrial Portfolio Segment [Member] |  |  |  |
Allowance for credit losses on loans |  | 12,584 | 11,276 | 12,439
Total Commercial and Industrial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | (1,163) |
Residential Real Estate Portfolio Segment [Member] |  |  |  |
Allowance for credit losses on loans |  | 5,207 | 4,089 | 2,474
Residential Real Estate Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | 1,615 |
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] |  |  |  |
Allowance for credit losses on loans |  | 1,818 | 1,376 | 947
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | 429 |
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] |  |  |  |
Allowance for credit losses on loans |  | 3,389 | 2,713 | 1,527
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | 1,186 |
Construction and Development [Member] |  |  |  |
Allowance for credit losses on loans |  | 6,119 | 5,161 | 2,105
Construction and Development [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | 3,056 |
Consumer Portfolio Segment [Member] |  |  |  |
Allowance for credit losses on loans |  | 340 | 398 | 100
Consumer Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | 298 |
Finance Leases Portfolio Segment [Member] |  |  |  |
Allowance for credit losses on loans |  | $ 261 | 233 | 237
Finance Leases Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | (4) |
Commercial Portfolio Segment [Member] |  |  |  |
Allowance for credit losses on loans |  |  | 96 | $ 146
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit losses on loans | [1] |  | $ (50) |
[1] | The impact of the ASC 326 adoption on the ACL on loans reflects $8.2 million related to the transition from the incurred loss ACL model to the CECL ACL model and $1.6 million related to the transition from PCI to PCD methodology as defined in thestandard.

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI https://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: 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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI https://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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