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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]        
Average number of common shares outstanding for basic calculation 7,498,584 7,545,001 7,528,251 7,539,799
Average number of common shares outstanding used to calculate diluted earnings per common share 7,567,527 7,650,145 7,601,613 7,645,357
NET INCOME $ 4,630 $ 5,295 $ 9,951 $ 10,029
Basic (in dollars per share) $ 0.62 $ 0.70 $ 1.32 $ 1.33
Diluted (in dollars per share) $ 0.61 $ 0.69 $ 1.31 $ 1.31
Isabella Bank Corporation Restricted Stock Plan        
Earnings Per Share [Abstract]        
Average potential effect of common shares in the Directors Plan 30,777 30,208 29,569 26,345
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 30,777 30,208 29,569 26,345
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] 38,166 74,936 43,793 79,213
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] 38,166 74,936 43,793 79,213
[1] Exclusive of shares held in the Rabbi Trust