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Capital Ratios and Shareholders' Equity | 3 Months Ended
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Mar. 31, 2025
Equity [Abstract] |
Equity | Capital Ratios and Shareholders' Equity As of March 31, 2025 and December 31, 2024, 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. The minimum requirements presented below include the minimum required capital levels based on the Basel III Capital Rules. Capital requirements to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. There were no conditions or events since the notifications that we believe have changed our categories. The following tables set forth these requirements and our ratios as of:
| March 31, 2025
| Actual |  | Minimum Capital Required Plus Capital Conservation Buffer |  | Minimum Capital Required To Be Considered Well Capitalized (1)
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
Common equity Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | $ | 176,720 |  |  | 12.08 | % |  | $ | 102,391 |  |  | 7.00 | % |  | $ | 95,077 |  |  | 6.50 | %
Consolidated | 184,713 |  |  | 12.58 | % |  | 102,748 |  |  | 7.00 | % |  | N/A |  | N/A
Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 176,720 |  |  | 12.08 | % |  | 124,331 |  |  | 8.50 | % |  | 117,018 |  |  | 8.00 | %
Consolidated | 184,713 |  |  | 12.58 | % |  | 124,765 |  |  | 8.50 | % |  | N/A |  | N/A
Total capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 190,072 |  |  | 12.99 | % |  | 153,586 |  |  | 10.50 | % |  | 146,272 |  |  | 10.00 | %
Consolidated | 227,512 |  |  | 15.50 | % |  | 154,121 |  |  | 10.50 | % |  | N/A |  | N/A
Tier 1 capital to average assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 176,720 |  |  | 8.59 | % |  | 82,267 |  |  | 4.00 | % |  | 102,834 |  |  | 5.00 | %
Consolidated | 184,713 |  |  | 8.96 | % |  | 82,465 |  |  | 4.00 | % |  | N/A |  | N/A
| December 31, 2024
| Actual |  | Minimum Capital Required Plus Capital Conservation Buffer |  | Minimum Capital Required To Be Considered Well Capitalized (1)
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
Common equity Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | $ | 172,589 |  |  | 11.53 | % |  | $ | 104,783 |  |  | 7.00 | % |  | $ | 97,299 |  |  | 6.50 | %
Consolidated | 183,348 |  |  | 12.21 | % |  | 105,136 |  |  | 7.00 | % |  | N/A |  | N/A
Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 172,589 |  |  | 11.53 | % |  | 127,237 |  |  | 8.50 | % |  | 119,753 |  |  | 8.00 | %
Consolidated | 183,348 |  |  | 12.21 | % |  | 127,665 |  |  | 8.50 | % |  | N/A |  | N/A
Total capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 185,997 |  |  | 12.43 | % |  | 157,175 |  |  | 10.50 | % |  | 149,691 |  |  | 10.00 | %
Consolidated | 226,179 |  |  | 15.06 | % |  | 157,703 |  |  | 10.50 | % |  | N/A |  | N/A
Tier 1 capital to average assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 172,589 |  |  | 8.36 | % |  | 82,602 |  |  | 4.00 | % |  | 103,252 |  |  | 5.00 | %
Consolidated | 183,348 |  |  | 8.86 | % |  | 82,803 |  |  | 4.00 | % |  | N/A |  | N/A
(1) "Well-capitalized" minimum Common Equity Tier 1 to Risk-Weighted and Leverage Ratio are not formally defined under applicable regulations for bank holding companies. Total capital includes Tier 1 capital and Tier 2 capital. Tier 2 capital includes a permissible portion of the allowances for credit losses and subordinated debt, net of unamortized issuance costs. There are no significant regulatory constraints placed on our capital. At March 31, 2025, the Bank exceeded all minimum capital requirements. The following table summarizes the changes in AOCI by component for the:
| Three Months Ended March 31
| 2025 |  | 2024
| Unrealized Gains (Losses) on AFS Securities |  | Defined Benefit Pension Plan |  | Total |  | Unrealized Gains (Losses) on AFS Securities |  | Defined Benefit Pension Plan |  | Total
Balance, December 31 | $ | (20,958) |  |  | $ | (397) |  |  | $ | (21,355) |  |  | $ | (25,199) |  |  | $ | (697) |  |  | $ | (25,896) |
OCI before reclassifications | 5,014 |  |  | — |  |  | 5,014 |  |  | (2,926) |  |  | — |  |  | (2,926) |
Amounts reclassified from AOCI | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Subtotal | 5,014 |  |  | — |  |  | 5,014 |  |  | (2,926) |  |  | — |  |  | (2,926) |
Tax effect | (1,098) |  |  | — |  |  | (1,098) |  |  | 632 |  |  | — |  |  | 632 |
OCI, net of tax | 3,916 |  |  | — |  |  | 3,916 |  |  | (2,294) |  |  | — |  |  | (2,294) |
Balance, March 31 | $ | (17,042) |  |  | $ | (397) |  |  | $ | (17,439) |  |  | $ | (27,493) |  |  | $ | (697) |  |  | $ | (28,190) |
Included in OCI for the three-month periods ended March 31, 2025 and 2024 are changes in unrealized gains and losses related to certain auction rate money market preferred stocks. These investments, for federal income tax purposes, have no deferred federal income taxes related to unrealized gains or losses given the nature of the investments. A summary of the components of unrealized gains on AFS securities included in OCI follows for the:
| Three Months Ended March 31
| 2025 |  | 2024
| Auction Rate Money Market Preferred |  | All Other AFS Securities |  | Total |  | Auction Rate Money Market Preferred |  | All Other AFS Securities |  | Total
Unrealized gains (losses) arising during the period | $ | (215) |  |  | $ | 5,229 |  |  | $ | 5,014 |  |  | $ | 82 |  |  | $ | (3,008) |  |  | $ | (2,926) |
Reclassification adjustment for net (gains) losses included in net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net unrealized gains (losses) | (215) |  |  | 5,229 |  |  | 5,014 |  |  | 82 |  |  | (3,008) |  |  | (2,926) |
Tax effect | — |  |  | (1,098) |  |  | (1,098) |  |  | — |  |  | 632 |  |  | 632 |
Unrealized gains (losses), net of tax | $ | (215) |  |  | $ | 4,131 |  |  | $ | 3,916 |  |  | $ | 82 |  |  | $ | (2,376) |  |  | $ | (2,294) |

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