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Note 20 - Regulatory Capital - Regulatory Capital (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Parent Company [Member]    
Total Capital $ 204,353 $ 162,558
Total Capital (to risk-weighted assets) ratio 0.144 0.132
Minimum amount of capital for adequacy purposes $ 113,604 $ 98,835
Minimum amount of capital for adequacy purposes, ratio 0.080 0.080
Common equity Capital $ 160,338 $ 150,465
Common equity Capital ratio 0.113 0.122
Minimum amount of Common equity Capital for adequacy purposes $ 63,902 $ 55,595
Minimum amount of Common equity Capital for adequacy purposes, ratio 0.045 0.045
Tier 1 Capital $ 164,838 $ 150,465
Tier 1 Capital (to risk-weighted assets) ratio 0.116 0.122
Minimum amount of Tier 1 Capital for adequacy purposes $ 85,203 $ 74,126
Minimum amount of Tier 1 Capital for adequacy purposes, ratio 0.060 0.060
Tier 1 Capital $ 164,838 $ 150,465
Tier 1 Capital (to average assets) ratio 0.074 0.083
Minimum amount of Tier 1 Capital for adequacy purposes $ 89,415 $ 72,281
Minimum amount of Tier 1 Capital for adequacy purposes, ratio 0.040 0.040
ChoiceOne Bank [Member]    
Total Capital $ 182,275 $ 159,684
Total Capital (to risk-weighted assets) ratio 0.129 0.129
Minimum amount of capital for adequacy purposes $ 113,444 $ 98,683
Minimum amount of capital for adequacy purposes, ratio 0.080 0.080
Common equity Capital $ 174,587 $ 152,091
Common equity Capital ratio 0.123 0.123
Minimum amount of Common equity Capital for adequacy purposes $ 63,813 $ 55,509
Minimum amount of Common equity Capital for adequacy purposes, ratio 0.045 0.045
Tier 1 Capital $ 174,587 $ 152,091
Tier 1 Capital (to risk-weighted assets) ratio 0.123 0.123
Minimum amount of Tier 1 Capital for adequacy purposes $ 85,083 $ 74,012
Minimum amount of Tier 1 Capital for adequacy purposes, ratio 0.060 0.060
Tier 1 Capital $ 174,587 $ 152,091
Tier 1 Capital (to average assets) ratio 0.078 0.084
Minimum amount of Tier 1 Capital for adequacy purposes $ 89,289 $ 72,208
Minimum amount of Tier 1 Capital for adequacy purposes, ratio 0.040 0.040
Minimum Capital required to be well-capitalized $ 141,806 $ 123,353
Minimum Capital required to be well-capitalized, ratio 0.100 0.100
Minimum Common equity Capital required to be well-capitalized $ 92,174 $ 80,180
Minimum Common equity Capital required to be well-capitalized, ratio 0.065 0.065
Minimum Tier 1 Capital required to be well-capitalized $ 113,444 $ 98,683
Minimum Tier 1 Capital required to be well-capitalized, ratio 0.080 0.080
Minimum Tier 1 Capital required to be well-capitalized $ 111,611 $ 90,259
Minimum Tier 1 Capital required to be well-capitalized, ratio 0.050 0.050