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Computation of Earnings Per Common Share (Schedule of Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]        
Average number of common shares outstanding for basic calculation 7,555,333 7,932,227 7,544,909 7,948,578
Average number of common shares outstanding used to calculate diluted earnings per common share 7,650,950 8,044,572 7,647,117 8,065,252
NET INCOME $ 5,887 $ 4,686 $ 15,916 $ 14,705
Basic (in dollars per share) $ 0.78 $ 0.59 $ 2.11 $ 1.85
Diluted (in dollars per share) $ 0.77 $ 0.58 $ 2.08 $ 1.82
Isabella Bank Corporation Restricted Stock Plan        
Earnings Per Share [Abstract]        
Average potential effect of common shares in the Directors Plan 29,111 17,517 27,277 12,858
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 29,111 17,517 27,277 12,858
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] 66,506 94,828 74,931 103,816
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements [1] 66,506 94,828 74,931 103,816
[1] Exclusive of shares held in the Rabbi Trust