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Minimum Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Common Equity Tier 1 Capital [Abstract]    
Common Equity Tier One Capital $ 159,794 $ 154,705
CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets 12.56% 12.58%
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy $ 89,090 $ 78,431
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 7.00% 6.375%
Tier 1 capital to risk weighted assets    
Actual Amount $ 159,794 $ 154,705
Actual Ratio 12.56% 12.58%
Minimum Capital Requirement Amount $ 108,180 $ 96,885
Minimum Capital Requirement Ratio 8.50% 7.875%
Total capital to risk weighted assets    
Actual Amount $ 167,733 $ 163,080
Actual Ratio 13.18% 13.26%
Minimum Capital Requirement Amount $ 133,635 $ 121,491
Minimum Capital Requirement Ratio 10.50% 9.875%
Tier 1 capital to average assets    
Actual Amount $ 159,794 $ 154,705
Actual Ratio 9.01% 8.72%
Minimum Capital Requirement Amount $ 70,945 $ 70,996
Minimum Capital Requirement Ratio 4.00% 4.00%
Isabella Bank [Member]    
Common Equity Tier 1 Capital [Abstract]    
Common Equity Tier One Capital $ 150,093 $ 143,429
CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets 11.86% 11.75%
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy $ 88,587 $ 77,826
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 7.00% 6.375%
CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized $ 82,260 $ 79,352
CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.50% 6.50%
Tier 1 capital to risk weighted assets    
Actual Amount $ 150,093 $ 143,429
Actual Ratio 11.86% 11.75%
Minimum Capital Requirement Amount $ 107,570 $ 96,138
Minimum Capital Requirement Ratio 8.50% 7.875%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 101,243 $ 97,664
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 8.00% 8.00%
Total capital to risk weighted assets    
Actual Amount $ 158,032 $ 151,804
Actual Ratio 12.49% 12.43%
Minimum Capital Requirement Amount $ 132,881 $ 120,554
Minimum Capital Requirement Ratio 10.50% 9.875%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 126,554 $ 122,080
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.00% 10.00%
Tier 1 capital to average assets    
Actual Amount $ 150,093 $ 143,429
Actual Ratio 8.54% 8.07%
Minimum Capital Requirement Amount $ 70,288 $ 71,085
Minimum Capital Requirement Ratio 4.00% 4.00%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 87,861 $ 88,856
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 5.00% 5.00%