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Capital Ratios (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier One Capital | $ 181,981 | $ 180,014
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual | 0.1208 | 0.1254
CommonEquityTierOneRiskRatedCapitalRequiredForCapitalAdequacyMinimumPlusCapitalConservationBuffer | $ 105,507 | $ 100,449
CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 7.00% | 7.00%
Actual Amount | $ 181,981 | $ 180,014
Actual Ratio | 0.1208 | 0.1254
Capital Adequacy Minimum with Buffer | $ 128,116 | $ 121,973
TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.0850 | 0.0850
Banking Regulation, Total Capital, Actual | $ 224,516 | $ 222,772
Banking Regulation, Total Risk-Based Capital Ratio, Actual | 0.1490 | 0.1552
CapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 158,261 | $ 150,673
CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.1050 | 0.1050
Banking Regulation, Tier 1 Leverage Capital, Actual | $ 181,981 | $ 180,014
Banking Regulation, Tier 1 Leverage Capital Ratio, Actual | 0.0877 | 0.0876
TierOneLeverageCapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 83,044 | $ 82,154
TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.0400 | 0.0400
Isabella Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier One Capital | $ 173,019 | $ 178,316
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual | 0.1152 | 0.1248
CommonEquityTierOneRiskRatedCapitalRequiredForCapitalAdequacyMinimumPlusCapitalConservationBuffer | $ 105,136 | $ 100,043
CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 7.00% | 7.00%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum | $ 97,627 | $ 92,897
Tier 1 Capital to Risk Weighted Asssets | 0.0650 | 0.0650
Actual Amount | $ 173,019 | $ 178,316
Actual Ratio | 0.1152 | 0.1248
Capital Adequacy Minimum with Buffer | $ 127,665 | $ 121,481
TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.0850 | 0.0850
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 120,156 | $ 114,335
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.0800 | 0.0800
Banking Regulation, Total Capital, Actual | $ 186,151 | $ 191,739
Banking Regulation, Total Risk-Based Capital Ratio, Actual | 0.1239 | 0.1342
CapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 157,704 | $ 150,065
CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.1050 | 0.1050
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum | $ 150,195 | $ 142,919
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum | 0.1000 | 0.1000
Banking Regulation, Tier 1 Leverage Capital, Actual | $ 173,019 | $ 178,316
Banking Regulation, Tier 1 Leverage Capital Ratio, Actual | 0.0835 | 0.0871
TierOneLeverageCapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 82,851 | $ 81,935
TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.0400 | 0.0400
Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum | $ 103,564 | $ 102,419
Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum | 0.0500 | 0.0500

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