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Note 6 - Fair Value Measurements and Fair Value of Financial Instruments - Significant Unobservable Inputs for Assets Measured on Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Commercial Portfolio Segment [Member] |  |
Collateral dependent loans, fair value | $ 10,659 | $ 14,550
Commercial Real Estate Portfolio Segment [Member] |  |
Collateral dependent loans, fair value | 7,330 | 17,264
Residential Portfolio Segment [Member] |  |
Collateral dependent loans, fair value |  | 1,392
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] |  |
Collateral dependent loans, fair value | 10,659 | 14,550
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Average Transfer Price as Price to Unpaid Principal Balance [Member] | Valuation, Market Approach [Member] |  |
Collateral dependent loans, fair value | $ 10,205 | $ 14,028
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Average Transfer Price as Price to Unpaid Principal Balance [Member] | Valuation, Market Approach [Member] | Maximum [Member] |  |
Collateral dependent loans, rate | 92 | 96
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Average Transfer Price as Price to Unpaid Principal Balance [Member] | Valuation, Market Approach [Member] | Weighted Average [Member] |  |
Collateral dependent loans, rate | 68 | 67
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Average Transfer Price as Price to Unpaid Principal Balance [Member] | Valuation, Market Approach [Member] | Minimum [Member] |  |
Collateral dependent loans, rate | 65 | 65
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] |  |
Collateral dependent loans, fair value | $ 454 | $ 522
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] | Maximum [Member] |  |
Collateral dependent loans, rate | 25 | 13
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] | Weighted Average [Member] |  |
Collateral dependent loans, rate | 0.1 | 3
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] | Minimum [Member] |  |
Collateral dependent loans, rate | (7.5) | (10)
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Collateral dependent loans, fair value | $ 7,330 | $ 17,264
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] |  |
Collateral dependent loans, fair value | $ 7,330 | $ 17,264
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] | Maximum [Member] |  |
Collateral dependent loans, rate | 5 | 0
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] | Weighted Average [Member] |  |
Collateral dependent loans, rate | 4 | 15
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] | Minimum [Member] |  |
Collateral dependent loans, rate | (15) | (20)
Fair Value, Inputs, Level 3 [Member] | Residential Portfolio Segment [Member] |  |
Collateral dependent loans, fair value |  | $ 1,392
Fair Value, Inputs, Level 3 [Member] | Residential Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] |  |
Collateral dependent loans, fair value |  | $ 1,392
Fair Value, Inputs, Level 3 [Member] | Residential Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] | Maximum [Member] |  |
Collateral dependent loans, rate |  | 39
Fair Value, Inputs, Level 3 [Member] | Residential Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] | Weighted Average [Member] |  |
Collateral dependent loans, rate |  | 22
Fair Value, Inputs, Level 3 [Member] | Residential Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Appraisals of Collateral Value [Member] | Minimum [Member] |  |
Collateral dependent loans, rate |  | 21

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