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Minimum Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Common Equity Tier 1 Capital [Abstract]    
Common Equity Tier One Capital $ 162,532 $ 159,794
CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets 12.97% 12.56%
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy $ 87,675 $ 89,090
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 7.00% 7.00%
Tier 1 capital to risk weighted assets    
Actual Amount $ 162,532 $ 159,794
Actual Ratio 12.97% 12.56%
Minimum Capital Requirement Amount $ 106,462 $ 108,180
Minimum Capital Requirement Ratio 8.50% 8.50%
Total capital to risk weighted assets    
Actual Amount $ 172,276 $ 167,733
Actual Ratio 13.75% 13.18%
Minimum Capital Requirement Amount $ 131,512 $ 133,635
Minimum Capital Requirement Ratio 10.50% 10.50%
Tier 1 capital to average assets    
Actual Amount $ 162,532 $ 159,794
Actual Ratio 8.37% 9.01%
Minimum Capital Requirement Amount $ 77,671 $ 70,945
Minimum Capital Requirement Ratio 4.00% 4.00%
Isabella Bank [Member]    
Common Equity Tier 1 Capital [Abstract]    
Common Equity Tier One Capital $ 153,102 $ 150,093
CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets 12.28% 11.86%
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy $ 87,273 $ 88,587
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 7.00% 7.00%
CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized $ 81,039 $ 82,260
CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.50% 6.50%
Tier 1 capital to risk weighted assets    
Actual Amount $ 153,102 $ 150,093
Actual Ratio 12.28% 11.86%
Minimum Capital Requirement Amount $ 105,975 $ 107,570
Minimum Capital Requirement Ratio 8.50% 8.50%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 99,741 $ 101,243
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 8.00% 8.00%
Total capital to risk weighted assets    
Actual Amount $ 162,846 $ 158,032
Actual Ratio 13.06% 12.49%
Minimum Capital Requirement Amount $ 130,910 $ 132,881
Minimum Capital Requirement Ratio 10.50% 10.50%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 124,676 $ 126,554
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.00% 10.00%
Tier 1 capital to average assets    
Actual Amount $ 153,102 $ 150,093
Actual Ratio 7.97% 8.54%
Minimum Capital Requirement Amount $ 76,814 $ 70,288
Minimum Capital Requirement Ratio 4.00% 4.00%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 96,018 $ 87,861
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 5.00% 5.00%