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Minimum Regulatory Capital Requirements (Details) $ in Thousands | 12 Months Ended |
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Banking Regulation, Risk-Based Information [Abstract] |  |
Regulatory Capital Requirements under Banking Regulations [Text Block] | Minimum Regulatory Capital Requirements The Corporation (on a consolidated basis) and the Bank are subject to various regulatory capital requirements administered by the FRB and the FDIC. Failure to meet minimum capital requirements can initiate mandatory and possibly additional discretionary actions by the FRB and the FDIC that, if undertaken, could have a material effect on our financial statements. Under regulatory capital adequacy guidelines and the regulatory framework for prompt corrective action, we must meet specific capital guidelines that include quantitative measures of assets, liabilities, capital, and certain off-balance-sheet items, as calculated under regulatory accounting standards. Our capital amounts and classifications are also subject to qualitative judgments by the FRB and the FDIC about components, risk weightings, and other factors. Prompt corrective action provisions are not applicable to bank holding companies. Quantitative measures established by regulation to ensure capital adequacy require us to maintain minimum amounts and ratios (set forth in the following table) of total capital, tier 1 capital, and common equity tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined) and tier 1 capital to average assets (as defined). We believe, as of December 31, 2022 and 2021, that we met all capital adequacy requirements. The FRB has established minimum risk-based capital guidelines. Pursuant to these guidelines, a framework has been established that assigns risk weights to each category of on and off-balance-sheet items to arrive at risk adjusted total assets. Regulatory capital is divided by the risk adjusted assets with the resulting ratio compared to the minimum standard to determine whether a corporation has adequate capital. The common equity tier 1 capital ratio has a minimum requirement of 4.50%. The minimum standard for primary, or Tier 1 capital is 6.00% and the minimum standard for total capital is 8.00%. As of December 31, 2022 and 2021, the most recent notifications from the FRB and the FDIC categorized us as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, an institution must maintain total risk-based, Tier 1 risk-based, Common Equity Tier 1, and Tier 1 leverage ratios as set forth in the following tables. There were no conditions or events since the notifications that we believe have changed our categories. Our actual capital amounts and ratios are also presented in the table.
| Actual |  | Minimum Capital Requirement |  | Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | $ | 190,060 |  |  | 14.07 | % |  | $ | 94,565 |  |  | 7.00 | % |  | $ | 87,811 |  |  | 6.50 | %
Consolidated | 175,112 |  |  | 12.91 | % |  | 94,948 |  |  | 7.00 | % |  | N/A |  | N/A
Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 190,060 |  |  | 14.07 | % |  | 114,829 |  |  | 8.50 | % |  | 108,075 |  |  | 8.00 | %
Consolidated | 175,112 |  |  | 12.91 | % |  | 115,295 |  |  | 8.50 | % |  | N/A |  | N/A
Total capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 199,910 |  |  | 14.80 | % |  | 141,848 |  |  | 10.50 | % |  | 135,093 |  |  | 10.00 | %
Consolidated | 214,207 |  |  | 15.79 | % |  | 142,423 |  |  | 10.50 | % |  | N/A |  | N/A
Tier 1 capital to average assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 190,060 |  |  | 9.36 | % |  | 81,181 |  |  | 4.00 | % |  | 101,476 |  |  | 5.00 | %
Consolidated | 175,112 |  |  | 8.61 | % |  | 81,392 |  |  | 4.00 | % |  | N/A |  | N/A
| Actual |  | Minimum Capital Requirement |  | Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | $ | 171,255 |  |  | 12.91 | % |  | $ | 92,849 |  |  | 7.00 | % |  | $ | 86,217 |  |  | 6.50 | %
Consolidated | 160,871 |  |  | 12.07 | % |  | 93,297 |  |  | 7.00 | % |  | N/A |  | N/A
Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 171,255 |  |  | 12.91 | % |  | 112,746 |  |  | 8.50 | % |  | 106,114 |  |  | 8.00 | %
Consolidated | 160,871 |  |  | 12.07 | % |  | 113,289 |  |  | 8.50 | % |  | N/A |  | N/A
Total capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 180,358 |  |  | 13.60 | % |  | 139,274 |  |  | 10.50 | % |  | 132,642 |  |  | 10.00 | %
Consolidated | 199,132 |  |  | 14.94 | % |  | 139,945 |  |  | 10.50 | % |  | N/A |  | N/A
Tier 1 capital to average assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 171,255 |  |  | 8.54 | % |  | 80,171 |  |  | 4.00 | % |  | 100,214 |  |  | 5.00 | %
Consolidated | 160,871 |  |  | 7.97 | % |  | 80,733 |  |  | 4.00 | % |  | N/A |  | N/A
Common Equity Tier 1 Capital [Abstract] |  |
Common Equity Tier One Capital | $ 175,112 | $ 160,871
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual | 0.1291 | 0.1207
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy | $ 94,948 | $ 93,297
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 7.00% | 7.00%
Tier 1 capital to risk weighted assets |  |
Actual Amount | $ 175,112 | $ 160,871
Actual Ratio | 0.1291 | 0.1207
Capital Adequacy Minimum with Buffer | $ 115,295 | $ 113,289
TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.0850 | 0.0850
Total capital to risk weighted assets |  |
Actual Amount | $ 214,207 | $ 199,132
Actual Ratio | 0.1579 | 0.1494
CapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 142,423 | $ 139,945
CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.1050 | 0.1050
Tier 1 capital to average assets |  |
Actual Amount | $ 175,112 | $ 160,871
Actual Ratio | 0.0861 | 0.0797
TierOneLeverageCapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 81,392 | $ 80,733
TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.0400 | 0.0400
Isabella Bank [Member] |  |
Common Equity Tier 1 Capital [Abstract] |  |
Common Equity Tier One Capital | $ 190,060 | $ 171,255
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual | 0.1407 | 0.1291
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy | $ 94,565 | $ 92,849
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 7.00% | 7.00%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum | $ 87,811 | $ 86,217
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum | 0.0650 | 0.0650
Tier 1 capital to risk weighted assets |  |
Actual Amount | $ 190,060 | $ 171,255
Actual Ratio | 0.1407 | 0.1291
Capital Adequacy Minimum with Buffer | $ 114,829 | $ 112,746
TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.0850 | 0.0850
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 108,075 | $ 106,114
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.0800 | 0.0800
Total capital to risk weighted assets |  |
Actual Amount | $ 199,910 | $ 180,358
Actual Ratio | 0.1480 | 0.1360
CapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 141,848 | $ 139,274
CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.1050 | 0.1050
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 135,093 | $ 132,642
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.1000 | 0.1000
Tier 1 capital to average assets |  |
Actual Amount | $ 190,060 | $ 171,255
Actual Ratio | 0.0936 | 0.0854
TierOneLeverageCapitalRequiredForCapitalAdequacyMinimumCapitalRequiredPlusCapitalConservationBuffer | $ 81,181 | $ 80,171
TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssetsMinimumCapitalRequiredPlusCapitalConservationBuffer | 0.0400 | 0.0400
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 101,476 | $ 100,214
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.0500 | 0.0500

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- Definition Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action. + 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 https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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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 https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Amount of minimum total risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action. + 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 https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition The entire disclosure for regulatory capital requirement for depository and lending institutions. Institutions include, but not are not limited to, finance company, insured depository institution, bank holding company, savings and loan association holding company, bank and savings institution not federally insured, mortgage company, foreign financial institution and credit union. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1F -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958575-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958569-112826 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1D -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958573-112826 + Details
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- Definition Amount of Tier 1 leverage 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 https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Amount of Tier 1 risk-based 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 https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action. + 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 https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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