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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Average number of common shares outstanding for basic calculation 7,545,001 7,944,455 7,539,799 7,956,889
Average number of common shares outstanding used to calculate diluted earnings per common share 7,650,145 8,063,164 7,645,357 8,075,763
NET INCOME $ 5,295 $ 4,621 $ 10,029 $ 10,019
Basic (in dollars per share) $ 0.70 $ 0.58 $ 1.33 $ 1.26
Diluted (in dollars per share) $ 0.69 $ 0.57 $ 1.31 $ 1.24
Isabella Bank Corporation Restricted Stock Plan        
Earnings Per Share [Abstract]        
Average potential effect of common shares in the Directors Plan 30,208 16,257 26,345 10,489
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 30,208 16,257 26,345 10,489
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] 74,936 102,452 79,213 108,385
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] 74,936 102,452 79,213 108,385
[1] Exclusive of shares held in the Rabbi Trust