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Capital Ratios (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier One Capital | $ 183,348 | $ 180,014
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual | 0.1221 | 0.1254
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy | $ 105,136 | $ 100,449
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 7.00% | 7.00%
Tier 1, Actual Amount | $ 183,348 | $ 180,014
Tier 1, Actual Ratio | 0.1221 | 0.1254
Capital Adequacy Minimum with Buffer | $ 127,665 | $ 121,973
TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.0850 | 0.0850
Banking Regulation, Total Capital, Actual | $ 226,179 | $ 222,772
Capital to Risk Weighted Assets | 0.1506 | 0.1552
CapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 157,703 | $ 150,673
CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.1050 | 0.1050
Tier One Leverage Capital | $ 183,348 | $ 180,014
Tier One Leverage Capital to Average Assets | 0.0886 | 0.0876
TierOneLeverageCapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 82,803 | $ 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 | $ 172,589 | $ 178,316
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual | 0.1153 | 0.1248
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy | $ 104,783 | $ 100,043
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 7.00% | 7.00%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum | $ 97,299 | $ 92,897
Tier 1 Capital to Risk Weighted Assets | 0.0650 | 0.0650
Tier 1, Actual Amount | $ 172,589 | $ 178,316
Tier 1, Actual Ratio | 0.1153 | 0.1248
Capital Adequacy Minimum with Buffer | $ 127,237 | $ 121,481
TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.0850 | 0.0850
Tier One Risk Based Capital Required to be Well Capitalized | $ 119,753 | $ 114,335
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.0800 | 0.0800
Banking Regulation, Total Capital, Actual | $ 185,997 | $ 191,739
Capital to Risk Weighted Assets | 0.1243 | 0.1342
CapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 157,175 | $ 150,065
CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.1050 | 0.1050
Capital Required to be Well Capitalized | $ 149,691 | $ 142,919
Capital Required to be Well Capitalized to Risk Weighted Assets | 0.1000 | 0.1000
Tier One Leverage Capital | $ 172,589 | $ 178,316
Tier One Leverage Capital to Average Assets | 0.0836 | 0.0871
TierOneLeverageCapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 82,602 | $ 81,935
TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.0400 | 0.0400
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amoutnnt | $ 103,252 | $ 102,419
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 0.0500 | 0.0500

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