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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Isabella Bank Corporation Restricted Stock Plan | Accounting Standards Update 2016-13 | Common Stock | Common Stock Isabella Bank Corporation Restricted Stock Plan | Additional Paid-in Capital Isabella Bank Corporation Restricted Stock Plan | Shares to be Issued for Deferred Compensation Obligations | Retained Earnings | Retained Earnings Accounting Standards Update 2016-13 | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balances at Dec. 31, 2021 | $ 211,048 |  |  | $ 129,052 |  |  | $ 4,545 | $ 75,592 |  | $ 1,859
Beginning balances, shares at Dec. 31, 2021 |  |  |  | 7,532,641 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | (16,815) |  |  |  |  |  |  | 22,238 |  | (39,053)
Issuance of common stock | 1,762 |  |  | $ 1,762 |  |  |  |  |  |
Issuance of common stock, shares |  |  |  | 74,445 |  |  |  |  |  |
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations | 0 |  |  | $ 3 |  |  | (3) |  |  |
Share based payment awards under equity compensation plan | 463 |  |  |  |  |  | 463 |  |  |
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition |  | $ 147 |  |  |  | $ 147 |  |  |  |
Common stock purchased for deferred compensation obligations | (1,189) |  |  | (1,189) |  |  |  |  |  |
Common stock repurchased pursuant to publicly announced repurchase plan | (1,124) |  |  | $ (1,124) |  |  |  |  |  |
Common stock repurchased pursuant to publicly announced repurchase plan, shares |  |  |  | (47,665) |  |  |  |  |  |
Cash dividends | (8,082) |  |  |  |  |  |  | (8,082) |  |
Ending balances at Dec. 31, 2022 | 186,210 |  |  | $ 128,651 |  |  | 5,005 | 89,748 |  | (37,194)
Ending balances, shares at Dec. 31, 2022 |  |  |  | 7,559,421 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | 29,465 |  |  |  |  |  |  | 18,167 |  | 11,298
Issuance of common stock | 1,617 |  |  | $ 1,617 |  |  |  |  |  |
Issuance of common stock, shares |  |  |  | 75,488 |  |  |  |  |  |
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations | 0 |  |  | $ 1,841 |  |  | (1,841) |  |  |
Share based payment awards under equity compensation plan | 529 |  |  |  |  |  | 529 |  |  |
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition |  | 253 |  |  |  | 253 |  |  |  |
Common stock purchased for deferred compensation obligations | (1,624) |  |  | (1,624) |  |  |  |  |  |
Common stock repurchased pursuant to publicly announced repurchase plan | (3,415) |  |  | $ (3,415) |  |  |  |  |  |
Common stock repurchased pursuant to publicly announced repurchase plan, shares |  |  |  | (149,020) |  |  |  |  |  |
Cash dividends | (8,216) |  |  |  |  |  |  | (8,216) |  |
Ending balances at Dec. 31, 2023 | 202,402 |  |  | $ 127,323 |  |  | 3,693 | 97,282 |  | (25,896)
Ending balances, shares at Dec. 31, 2023 |  |  |  | 7,485,889 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Other |  |  | $ (2,417) |  |  |  |  |  | $ (2,417) |
Comprehensive income (loss) | 18,430 |  |  |  |  |  |  | 13,889 |  | 4,541
Issuance of common stock | 1,523 |  |  | $ 1,523 |  |  |  |  |  |
Issuance of common stock, shares |  |  |  | 75,341 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period |  |  |  |  | 16,240 |  |  |  |  |
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations | 0 |  |  | $ 1,691 |  |  | (1,691) |  |  |
Share based payment awards under equity compensation plan | 381 |  |  |  |  |  | 381 |  |  |
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition |  | $ 95 |  |  |  | $ 95 |  |  |  |
Common stock purchased for deferred compensation obligations | (1,332) |  |  | (1,332) |  |  |  |  |  |
Common stock repurchased pursuant to publicly announced repurchase plan | (3,076) |  |  | $ (3,076) |  |  |  |  |  |
Common stock repurchased pursuant to publicly announced repurchase plan, shares |  |  |  | (152,577) |  |  |  |  |  |
Cash dividends | (8,147) |  |  |  |  |  |  | (8,147) |  |
Ending balances at Dec. 31, 2024 | $ 210,276 |  |  | $ 126,224 |  |  | $ 2,383 | $ 103,024 |  | $ (21,355)
Ending balances, shares at Dec. 31, 2024 |  |  |  | 7,424,893 |  |  |  |  |  |

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