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Capital Ratios and Shareholders' Equity | 6 Months Ended
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Jun. 30, 2025
Equity [Abstract] |
Equity | Capital Ratios and Shareholders' Equity As of June 30, 2025 and December 31, 2024, the most recent notifications from the FRB and the FDIC categorized us as “well capitalized” under the FDIC's regulatory framework for prompt corrective action and the Basel III capital guidelines. To be categorized as “well capitalized,” an institution must maintain minimum 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 guidelines. Capital requirements to be considered “well capitalized” are based upon the FDIC's prompt corrective action regulations, as amended to reflect the changes under the Basel III capital guidelines. 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, both on a bank-only and on a consolidated basis, as of:
| June 30, 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 | $ | 181,950 |  |  | 12.18 | % |  | $ | 104,553 |  |  | 7.00 | % |  | $ | 97,085 |  |  | 6.50 | %
Consolidated | 186,605 |  |  | 12.46 | % |  | 104,870 |  |  | 7.00 | % |  | N/A |  | N/A
Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 181,950 |  |  | 12.18 | % |  | 126,958 |  |  | 8.50 | % |  | 119,490 |  |  | 8.00 | %
Consolidated | 186,605 |  |  | 12.46 | % |  | 127,342 |  |  | 8.50 | % |  | N/A |  | N/A
Total capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 195,636 |  |  | 13.10 | % |  | 156,830 |  |  | 10.50 | % |  | 149,362 |  |  | 10.00 | %
Consolidated | 229,759 |  |  | 15.34 | % |  | 157,305 |  |  | 10.50 | % |  | N/A |  | N/A
Tier 1 capital to average assets |  |  |  |  |  |  |  |  |  |  |
Isabella Bank | 181,950 |  |  | 8.83 | % |  | 82,377 |  |  | 4.00 | % |  | 102,972 |  |  | 5.00 | %
Consolidated | 186,605 |  |  | 9.04 | % |  | 82,580 |  |  | 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 June 30, 2025, the Bank exceeded all minimum Basel III risk-based capital requirements with the capital conservation buffer. State banking regulations place certain restrictions on dividends paid by banks to their shareholders. Dividends paid by the Corporation’s bank subsidiary would be prohibited if the effect thereof would cause the bank subsidiary’s capital to be reduced below applicable minimum capital requirements. The following table summarizes the changes in AOCI by component for the:
| Three Months Ended June 30
| 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, April 1 | $ | (17,042) |  |  |  |  | $ | (397) |  |  | $ | (17,439) |  |  | $ | (27,493) |  |  |  |  | $ | (697) |  |  | $ | (28,190) |
OCI before reclassifications | 3,879 |  |  |  |  | — |  |  | 3,879 |  |  | 703 |  |  |  |  | — |  |  | 703 |
Tax effect | (827) |  |  |  |  | — |  |  | (827) |  |  | (149) |  |  |  |  | — |  |  | (149) |
OCI, net of tax | 3,052 |  |  |  |  | — |  |  | 3,052 |  |  | 554 |  |  |  |  | — |  |  | 554 |
Balance, June 30 | $ | (13,990) |  |  |  |  | $ | (397) |  |  | $ | (14,387) |  |  | $ | (26,939) |  |  |  |  | $ | (697) |  |  | $ | (27,636) |
| Six Months Ended June 30
| 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 | 8,893 |  |  | — |  |  | 8,893 |  |  | (2,223) |  |  | — |  |  | (2,223) |
Tax effect | (1,925) |  |  | — |  |  | (1,925) |  |  | 483 |  |  | — |  |  | 483 |
OCI, net of tax | 6,968 |  |  | — |  |  | 6,968 |  |  | (1,740) |  |  | — |  |  | (1,740) |
Balance, June 30 | $ | (13,990) |  |  | $ | (397) |  |  | $ | (14,387) |  |  | $ | (26,939) |  |  | $ | (697) |  |  | $ | (27,636) |
Included in OCI for the three and six-month periods ended June 30, 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 June 30
| 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 | $ | (64) |  |  | $ | 3,943 |  |  | $ | 3,879 |  |  | $ | (5) |  |  | $ | 708 |  |  | $ | 703 |
Tax effect | — |  |  | (827) |  |  | (827) |  |  | — |  |  | (149) |  |  | (149) |
Unrealized gains (losses), net of tax | $ | (64) |  |  | $ | 3,116 |  |  | $ | 3,052 |  |  | $ | (5) |  |  | $ | 559 |  |  | $ | 554 |
| Six Months Ended June 30
| 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 | $ | (279) |  |  | $ | 9,172 |  |  | $ | 8,893 |  |  | $ | 77 |  |  | $ | (2,300) |  |  | $ | (2,223) |
Tax effect | — |  |  | (1,925) |  |  | (1,925) |  |  | — |  |  | 483 |  |  | 483 |
Unrealized gains (losses), net of tax | $ | (279) |  |  | $ | 7,247 |  |  | $ | 6,968 |  |  | $ | 77 |  |  | $ | (1,817) |  |  | $ | (1,740) |

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