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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Average number of common shares outstanding for basic calculation 7,357,977 7,454,097 7,385,813 7,475,571
Average number of common shares outstanding used to calculate diluted earnings per common share 7,371,652 7,473,184 7,399,441 7,492,404
Net income $ 5,240 $ 3,281 $ 14,220 $ 9,893
Basic (in dollars per share) $ 0.71 $ 0.44 $ 1.93 $ 1.32
Diluted (in dollars per share) $ 0.71 $ 0.44 $ 1.92 $ 1.32
Isabella Bank Corporation Restricted Stock Plan        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Average potential effect of common shares in the RSP 13,675 19,087 13,628 16,833