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Minimum Regulatory Capital Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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%

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