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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%

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