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Parent Company Only Financial Information (Interim Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating activities |  |  |
Net Income (Loss) Attributable to Parent | $ 22,238 | $ 19,499 | $ 10,885
Adjustments to reconcile net income to cash provided by operations |  |  |
Amortization of Debt Issuance Costs | 87 | 52 | 0
Undistributed earnings of equity securities without readily determinable fair values | 0 | 0 | (394)
Loss on sale of joint venture investment | 0 | 0 | 394
Depreciation | 2,071 | 2,314 | 2,620
Net amortization of AFS securities | 2,018 | 2,233 | 2,044
Deferred Income Tax Expense (Benefit) | 13 | (523) | (276)
Changes in operating assets and liabilities which used cash |  |  |
Other assets | (2,813) | 1,208 | (821)
Accrued interest and other liabilities | 2,182 | 146 | 398
Net cash provided by (used in) operating activities | 26,937 | 25,501 | 21,997
Payments to Acquire Equity Method Investments | 250 | 0 | 0
Investing activities |  |  |
Proceeds from Divestiture of Interest in Joint Venture | 0 | 0 | 1,000
Purchases of equipment and premises | (3,205) | (1,593) | (1,518)
Net cash provided by (used in) investing activities | (106,255) | (229,635) | 45,133
Financing activities |  |  |
Cash dividends paid on common stock | (8,082) | (8,367) | (8,524)
Proceeds from the issuance of common stock | 1,762 | 1,593 | 4,185
Common stock repurchased | (1,124) | (13,758) | (2,702)
Common stock purchased for deferred compensation obligations | (1,189) | (1,187) | (1,592)
Net cash provided by (used in) financing activities | 12,912 | 62,824 | 118,938
Increase (decrease) in cash and cash equivalents | (66,406) | (141,310) | 186,068
Cash and cash equivalents at beginning of period | 105,330 | 246,640 | 60,572
Cash and cash equivalents at end of period | 38,924 | 105,330 | 246,640
Proceeds from Issuance of Subordinated Long-term Debt | 0 | 29,106 | 0
Isabella Bank Corporation and Related Companies Deferred Compensation Plan for Directors |  |  |
Adjustments to reconcile net income to cash provided by operations |  |  |
Share-based payment awards | 463 | 433 | 413
Isabella Bank Corporation Restricted Stock Plan |  |  |
Adjustments to reconcile net income to cash provided by operations |  |  |
Share-based payment awards | 147 | 86 | 14
Parent Company [Member] |  |  |
Operating activities |  |  |
Net Income (Loss) Attributable to Parent | 22,238 | 19,499 | 10,885
Adjustments to reconcile net income to cash provided by operations |  |  |
Undistributed earnings of subsidiaries | (18,782) | (18,139) | (2,953)
Amortization of Debt Issuance Costs | 87 | 52 | 0
Undistributed earnings of equity securities without readily determinable fair values | 0 | 0 | (394)
Loss on sale of joint venture investment | 0 | 0 | 394
Depreciation | 50 | 50 | 47
Deferred Income Tax Expense (Benefit) | (133) | (267) | 351
Changes in operating assets and liabilities which used cash |  |  |
Other assets | 1,383 | (304) | 183
Accrued interest and other liabilities | 160 | 70 | 40
Net cash provided by (used in) operating activities | 5,613 | 1,480 | 8,980
Payments to Acquire Equity Method Investments | (250) | 0 | 0
Investing activities |  |  |
Proceeds from Divestiture of Interest in Joint Venture | 0 | 0 | 1,000
Purchases of equipment and premises | 260 | (2) | (37)
Net cash provided by (used in) investing activities | 10 | (2) | 963
Financing activities |  |  |
Cash dividends paid on common stock | (8,082) | (8,367) | (8,524)
Proceeds from the issuance of common stock | 1,762 | 1,593 | 4,185
Common stock repurchased | (1,124) | (13,758) | (2,702)
Common stock purchased for deferred compensation obligations | (1,189) | (1,187) | (1,592)
Net cash provided by (used in) financing activities | (8,633) | 7,387 | (8,633)
Increase (decrease) in cash and cash equivalents | (3,010) | 8,865 | 1,310
Cash and cash equivalents at beginning of period | 11,535 | 2,670 | 1,360
Cash and cash equivalents at end of period | 8,525 | 11,535 | 2,670
Proceeds from Issuance of Subordinated Long-term Debt | 0 | 29,106 | 0
Parent Company [Member] | Isabella Bank Corporation and Related Companies Deferred Compensation Plan for Directors |  |  |
Adjustments to reconcile net income to cash provided by operations |  |  |
Share-based payment awards | 463 | 433 | 413
Parent Company [Member] | Isabella Bank Corporation Restricted Stock Plan |  |  |
Adjustments to reconcile net income to cash provided by operations |  |  |
Share-based payment awards | $ 147 | $ 86 | $ 14

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