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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Cumulative effect of accounting change - adoption of ASC 326
Isabella Bank Corporation Restricted Stock Plan
Common Stock
Common Stock
Isabella Bank Corporation Restricted Stock Plan
Common Shares to be Issued for Deferred Compensation Obligations
Retained Earnings
Retained Earnings
Cumulative effect of accounting change - adoption of ASC 326
Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2022 $ 186,210 $ (2,417)   $ 128,651   $ 5,005 $ 89,748 $ (2,417) $ (37,194)
Beginning balances (in shares) at Dec. 31, 2022       7,559,421          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Comprehensive income (loss) 29,465           18,167   11,298
Issuance of common stock 1,617     $ 1,617          
Issuance of common stock, shares       75,488          
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0     $ 1,841   (1,841)      
Share-based payment awards under the Directors Plan 529         529      
Share-based compensation expense recognized in earnings under the RSP     $ 253   $ 253        
Common stock purchased for deferred compensation obligations (1,624)     (1,624)          
Common stock repurchased (3,415)     $ (3,415)          
Common stock repurchased (in shares)       (149,020)          
Cash dividends paid (8,216)           (8,216)    
Ending balance at Dec. 31, 2023 202,402     $ 127,323   3,693 97,282   (25,896)
Ending balances (in shares) at Dec. 31, 2023       7,485,889          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Comprehensive income (loss) 18,430           13,889   4,541
Issuance of common stock 1,523     $ 1,523          
Issuance of common stock, shares       75,341          
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0     $ 1,691   (1,691)      
Share-based payment awards under the Directors Plan 381         381      
Share-based compensation expense recognized in earnings under the RSP     95   $ 95        
Common stock purchased for deferred compensation obligations (1,332)     (1,332)          
Common stock repurchased (3,076)     $ (3,076)          
Common stock repurchased (in shares)       (152,577)          
Common stock issued for deferred compensation under the RSP (in shares)         16,240        
Cash dividends paid (8,147)           (8,147)    
Ending balance at Dec. 31, 2024 $ 210,276     $ 126,224   2,383 103,024   (21,355)
Ending balances (in shares) at Dec. 31, 2024 7,424,893     7,424,893          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Comprehensive income (loss) $ 32,242           18,910   13,332
Issuance of common stock 1,331     $ 1,331          
Issuance of common stock, shares       42,904          
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0     $ 294   (294)      
Share-based payment awards under the Directors Plan 277         277      
Share-based compensation expense recognized in earnings under the RSP     $ 64   $ 64        
Common stock repurchased (4,709)     $ (4,709)          
Common stock repurchased (in shares)       (156,957)          
Common stock issued for deferred compensation under the RSP (in shares)         11,367        
Cash dividends paid (8,085)           (8,085)    
Ending balance at Dec. 31, 2025 $ 231,396     $ 123,204   $ 2,366 $ 113,849   $ (8,023)
Ending balances (in shares) at Dec. 31, 2025 7,322,207     7,322,207