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Note 20 - Regulatory Capital - Regulatory Capital (Details) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Parent Company [Member] |  |
Total Capital | $ 162,558 | $ 135,836
Total Capital (to risk-weighted assets) ratio | 0.132 | 0.142
Minimum amount of capital for adequacy purposes | $ 98,835 | $ 76,288
Minimum amount of capital for adequacy purposes, ratio | 0.080 | 0.080
Common equity Capital | $ 150,465 | $ 131,785
Common equity Capital ratio | 0.122 | 0.138
Minimum amount of Common equity Capital for adequacy purposes | $ 55,595 | $ 42,912
Minimum amount of Common equity Capital for adequacy purposes, ratio | 0.045 | 0.045
Tier 1 Capital | $ 150,465 | $ 131,785
Tier 1 Capital (to risk-weighted assets) ratio | 0.122 | 0.138
Minimum amount of Tier 1 Capital for adequacy purposes | $ 74,126 | $ 57,216
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 0.060 | 0.060
Tier 1 Capital | $ 150,465 | $ 131,785
Tier 1 Capital (to average assets) ratio | 0.083 | 0.096
Minimum amount of Tier 1 Capital for adequacy purposes | $ 72,281 | $ 54,646
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 0.040 | 0.040
ChoiceOne Bank [Member] |  |
Total Capital | $ 159,684 | $ 69,412
Total Capital (to risk-weighted assets) ratio | 0.129 | 0.132
Minimum amount of capital for adequacy purposes | $ 98,683 | $ 42,039
Minimum amount of capital for adequacy purposes, ratio | 0.080 | 0.080
Common equity Capital | $ 152,091 | $ 65,362
Common equity Capital ratio | 0.123 | 0.124
Minimum amount of Common equity Capital for adequacy purposes | $ 55,509 | $ 23,647
Minimum amount of Common equity Capital for adequacy purposes, ratio | 0.045 | 0.045
Tier 1 Capital | $ 152,091 | $ 65,362
Tier 1 Capital (to risk-weighted assets) ratio | 0.123 | 0.124
Minimum amount of Tier 1 Capital for adequacy purposes | $ 74,012 | $ 31,530
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 0.060 | 0.060
Tier 1 Capital | $ 152,091 | $ 65,362
Tier 1 Capital (to average assets) ratio | 0.084 | 0.100
Minimum amount of Tier 1 Capital for adequacy purposes | $ 72,208 | $ 26,179
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 0.040 | 0.040
Minimum Capital required to be well-capitalized | $ 123,353 | $ 52,549
Minimum Capital required to be well-capitalized, ratio | 0.100 | 0.100
Minimum Common equity Capital required to be well-capitalized | $ 80,180 | $ 34,157
Minimum Common equity Capital required to be well-capitalized, ratio | 0.065 | 0.065
Minimum Tier 1 Capital required to be well-capitalized | $ 98,683 | $ 42,039
Minimum Tier 1 Capital required to be well-capitalized, ratio | 0.080 | 0.080
Minimum Tier 1 Capital required to be well-capitalized | $ 90,259 | $ 32,724
Minimum Tier 1 Capital required to be well-capitalized, ratio | 0.050 | 0.050
Lakestone Bank & Trust [Member] |  |
Total Capital |  | $ 63,885
Total Capital (to risk-weighted assets) ratio |  | 0.150
Minimum amount of capital for adequacy purposes |  | $ 34,056
Minimum amount of capital for adequacy purposes, ratio |  | 0.080
Common equity Capital |  | $ 63,885
Common equity Capital ratio |  | 0.150
Minimum amount of Common equity Capital for adequacy purposes |  | $ 19,156
Minimum amount of Common equity Capital for adequacy purposes, ratio |  | 0.045
Tier 1 Capital |  | $ 63,885
Tier 1 Capital (to risk-weighted assets) ratio |  | 0.150
Minimum amount of Tier 1 Capital for adequacy purposes |  | $ 25,542
Minimum amount of Tier 1 Capital for adequacy purposes, ratio |  | 0.060
Tier 1 Capital |  | $ 63,885
Tier 1 Capital (to average assets) ratio |  | 0.090
Minimum amount of Tier 1 Capital for adequacy purposes |  | $ 28,338
Minimum amount of Tier 1 Capital for adequacy purposes, ratio |  | 0.040
Minimum Capital required to be well-capitalized |  | $ 42,570
Minimum Capital required to be well-capitalized, ratio |  | 0.100
Minimum Common equity Capital required to be well-capitalized |  | $ 27,670
Minimum Common equity Capital required to be well-capitalized, ratio |  | 0.065
Minimum Tier 1 Capital required to be well-capitalized |  | $ 34,056
Minimum Tier 1 Capital required to be well-capitalized, ratio |  | 0.080
Minimum Tier 1 Capital required to be well-capitalized |  | $ 35,423
Minimum Tier 1 Capital required to be well-capitalized, ratio |  | 0.050

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