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Minimum Regulatory Capital Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Common Equity Tier 1 Capital [Abstract] |  |
Common Equity Tier One Capital | $ 160,871 | $ 162,532
CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets | 12.07% | 12.97%
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy | $ 93,297 | $ 87,675
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 7.00% | 7.00%
Tier 1 capital to risk weighted assets |  |
Actual Amount | $ 160,871 | $ 162,532
Actual Ratio | 0.1207 | 0.1297
Minimum Capital Requirement Amount | $ 113,289 | $ 106,462
Minimum Capital Requirement Ratio | 0.0850 | 0.0850
Total capital to risk weighted assets |  |
Actual Amount | $ 199,132 | $ 172,276
Actual Ratio | 0.1494 | 0.1375
Minimum Capital Requirement Amount | $ 139,945 | $ 131,512
Minimum Capital Requirement Ratio | 0.1050 | 0.1050
Tier 1 capital to average assets |  |
Actual Amount | $ 160,871 | $ 162,532
Actual Ratio | 0.0797 | 0.0837
Minimum Capital Requirement Amount | $ 80,733 | $ 77,671
Minimum Capital Requirement Ratio | 0.0400 | 0.0400
Isabella Bank [Member] |  |
Common Equity Tier 1 Capital [Abstract] |  |
Common Equity Tier One Capital | $ 171,255 | $ 153,102
CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets | 12.91% | 12.28%
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy | $ 92,849 | $ 87,273
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 7.00% | 7.00%
CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized | $ 86,217 | $ 81,039
CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets | 6.50% | 6.50%
Tier 1 capital to risk weighted assets |  |
Actual Amount | $ 171,255 | $ 153,102
Actual Ratio | 0.1291 | 0.1228
Minimum Capital Requirement Amount | $ 112,746 | $ 105,975
Minimum Capital Requirement Ratio | 0.0850 | 0.0850
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 106,114 | $ 99,741
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.0800 | 0.0800
Total capital to risk weighted assets |  |
Actual Amount | $ 180,358 | $ 162,846
Actual Ratio | 0.1360 | 0.1306
Minimum Capital Requirement Amount | $ 139,274 | $ 130,910
Minimum Capital Requirement Ratio | 0.1050 | 0.1050
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 132,642 | $ 124,676
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.1000 | 0.1000
Tier 1 capital to average assets |  |
Actual Amount | $ 171,255 | $ 153,102
Actual Ratio | 0.0854 | 0.0797
Minimum Capital Requirement Amount | $ 80,171 | $ 76,814
Minimum Capital Requirement Ratio | 0.0400 | 0.0400
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 100,214 | $ 96,018
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.0500 | 0.0500

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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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