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Note 20 - Regulatory Capital - Regulatory Capital (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
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