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Computation of Earnings Per Common Share (Schedule of Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings Per Share [Abstract]      
Average number of common shares outstanding for basic calculation 7,549,878 7,853,398 7,959,705
Average number of common shares outstanding used to calculate diluted earnings per common share 7,647,612 7,965,961 8,106,091
Net Income (Loss) Attributable to Parent $ 22,238 $ 19,499 $ 10,885
Basic (in dollars per share) $ 2.95 $ 2.48 $ 1.37
Diluted (in dollars per share) $ 2.91 $ 2.45 $ 1.34
Isabella Bank Corporation and Related Companies Deferred Compensation Plan for Directors      
Earnings Per Share [Abstract]      
Average potential effect of common shares in the Directors Plan [1] 70,329 99,813 143,878
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements [1] 70,329 99,813 143,878
Isabella Bank Corporation Restricted Stock Plan      
Earnings Per Share [Abstract]      
Average potential effect of common shares in the Directors Plan 27,405 12,750 2,508
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 27,405 12,750 2,508
[1] Exclusive of shares held in the Rabbi Trust