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Parent Company Only Financial Information (Interim Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities |  |  |
Net Income (Loss) Attributable to Parent | $ 10,885 | $ 13,024 | $ 14,021
Adjustments to reconcile net income to cash provided by operations |  |  |
Undistributed earnings of equity securities without readily determinable fair values | (394) | 3,320 | (144)
Loss on sale of joint venture investment | 394 | 0 | 0
Depreciation | 2,620 | 2,908 | 2,940
Net amortization of AFS securities | 2,044 | 1,784 | 1,873
Deferred Income Tax Expense (Benefit) | (276) | 408 | 275
Changes in operating assets and liabilities which used cash |  |  |
Other assets | (440) | 1,085 | 115
Accrued interest and other liabilities | 398 | 637 | 358
Net cash provided by (used in) operating activities | 21,997 | 23,303 | 21,963
Investing activities |  |  |
Proceeds from Divestiture of Interest in Joint Venture | 1,000 | 0 | 0
Purchases of equipment and premises | (1,518) | (1,335) | (2,305)
Net cash provided by (used in) investing activities | 45,133 | 15,480 | 6,517
Financing activities |  |  |
Cash dividends paid on common stock | (8,524) | (8,282) | (8,169)
Proceeds from the issuance of common stock | 4,185 | 4,876 | 6,864
Common stock repurchased | (2,702) | (4,003) | (7,007)
Common stock purchased for deferred compensation obligations | (1,592) | (1,131) | (401)
Net cash provided by (used in) financing activities | 118,938 | (51,682) | 14,143
Increase (decrease) in cash and cash equivalents | 186,068 | (12,899) | 42,623
Cash and cash equivalents at beginning of period | 60,572 | 73,471 | 30,848
Cash and cash equivalents at end of period | 246,640 | 60,572 | 73,471
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 | 413 | 523 | 612
Isabella Bank Corporation Restricted Stock Plan |  |  |
Adjustments to reconcile net income to cash provided by operations |  |  |
Share-based payment awards | 14 | 0 | 0
Parent Company [Member] |  |  |
Operating activities |  |  |
Net Income (Loss) Attributable to Parent | 10,885 | 13,024 | 14,021
Adjustments to reconcile net income to cash provided by operations |  |  |
Undistributed earnings of subsidiaries | (2,953) | (9,410) | (3,769)
Undistributed earnings of equity securities without readily determinable fair values | (394) | 3,320 | (144)
Loss on sale of joint venture investment | 394 | 0 | 0
Depreciation | 47 | 46 | 134
Deferred Income Tax Expense (Benefit) | 351 | 114 | (31)
Changes in operating assets and liabilities which used cash |  |  |
Other assets | 183 | (285) | 1,237
Accrued interest and other liabilities | 40 | 69 | (937)
Net cash provided by (used in) operating activities | 8,980 | 7,401 | 11,123
Investing activities |  |  |
Proceeds from Divestiture of Interest in Joint Venture | 1,000 | 0 | 0
Purchases of equipment and premises | (37) | 0 | (96)
Net cash provided by (used in) investing activities | 963 | 0 | (96)
Financing activities |  |  |
Cash dividends paid on common stock | (8,524) | (8,282) | (8,169)
Proceeds from the issuance of common stock | 4,185 | 4,876 | 6,864
Common stock repurchased | (2,702) | (4,003) | (7,007)
Common stock purchased for deferred compensation obligations | (1,592) | (1,131) | (401)
Net cash provided by (used in) financing activities | (8,633) | (8,540) | (8,713)
Increase (decrease) in cash and cash equivalents | 1,310 | (1,139) | 2,314
Cash and cash equivalents at beginning of period | 1,360 | 2,499 | 185
Cash and cash equivalents at end of period | 2,670 | 1,360 | 2,499
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 | 413 | 523 | 612
Parent Company [Member] | Isabella Bank Corporation Restricted Stock Plan |  |  |
Adjustments to reconcile net income to cash provided by operations |  |  |
Share-based payment awards | $ 14 | $ 0 | $ 0

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