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Interim Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Isabella Bank Corporation Restricted Stock Plan
Common Stock
Common Stock
Isabella Bank Corporation Restricted Stock Plan
Additional Paid-in Capital
Isabella Bank Corporation Restricted Stock Plan
Common Shares to be Issued for Deferred Compensation Obligations
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balances at Dec. 31, 2023 $ 202,402   $ 127,323     $ 3,693 $ 97,282 $ (25,896)
Beginning balances (in shares) at Dec. 31, 2023     7,485,889          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Comprehensive income (loss) 18,510           9,893 8,617
Issuance of common stock (in shares)     61,560          
Issuance of common stock 1,190 $ 0 $ 1,190          
Common stock issued for deferred compensation under the RSP (in shares)       16,240        
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0   (44)     44    
Share-based payment awards under the Directors Plan 332         332    
Share-based compensation expense recognized in earnings under the RSP   71     $ 71      
Common stock purchased for deferred compensation obligations (991)   $ (991)          
Common stock repurchased (in shares)     (124,969)          
Common stock repurchased (2,419)   $ (2,419)          
Cash dividends paid (6,110)           (6,110)  
Ending balances at Sep. 30, 2024 212,985   $ 125,218     3,981 101,065 (17,279)
Ending balances (in shares) at Sep. 30, 2024     7,438,720          
Beginning balances at Jun. 30, 2024 202,249   $ 126,126     3,951 99,808 (27,636)
Beginning balances (in shares) at Jun. 30, 2024     7,474,016          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Comprehensive income (loss) 13,638           3,281 10,357
Issuance of common stock (in shares)     17,580          
Issuance of common stock 350   $ 350          
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0   (23)     23    
Share-based payment awards under the Directors Plan 53         53    
Share-based compensation expense recognized in earnings under the RSP   26     26      
Common stock purchased for deferred compensation obligations (290)   $ (290)          
Common stock repurchased (in shares)     (52,876)          
Common stock repurchased (1,017)   $ (1,017)          
Cash dividends paid (2,024)           (2,024)  
Ending balances at Sep. 30, 2024 212,985   $ 125,218     3,981 101,065 (17,279)
Ending balances (in shares) at Sep. 30, 2024     7,438,720          
Beginning balances at Dec. 31, 2024 $ 210,276   $ 126,224     2,383 103,024 (21,355)
Beginning balances (in shares) at Dec. 31, 2024 7,424,893   7,424,893          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Comprehensive income (loss) $ 25,166           14,220 10,946
Issuance of common stock (in shares)     36,809          
Issuance of common stock 1,031 0 $ 1,031          
Common stock issued for deferred compensation under the RSP (in shares)       11,367        
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0   $ (243)     243    
Share-based payment awards under the Directors Plan 233         233    
Share-based compensation expense recognized in earnings under the RSP   45     45      
Common stock repurchased (in shares)     (122,502)          
Common stock repurchased (3,259)   $ (3,259)          
Cash dividends paid (6,072)           (6,072)  
Ending balances at Sep. 30, 2025 $ 227,420   $ 124,284     2,373 111,172 (10,409)
Ending balances (in shares) at Sep. 30, 2025 7,350,567   7,350,567          
Beginning balances at Jun. 30, 2025 $ 220,500   $ 124,607     2,331 107,949 (14,387)
Beginning balances (in shares) at Jun. 30, 2025     7,361,684          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Comprehensive income (loss) 9,218           5,240 3,978
Issuance of common stock (in shares)     7,979          
Issuance of common stock 272   $ 272          
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0   $ 10     (10)    
Share-based payment awards under the Directors Plan 32         32    
Share-based compensation expense recognized in earnings under the RSP   $ 24     $ 24      
Common stock repurchased (in shares)     (19,096)          
Common stock repurchased (609)   $ (609)          
Cash dividends paid (2,017)           (2,017)  
Ending balances at Sep. 30, 2025 $ 227,420   $ 124,284     $ 2,373 $ 111,172 $ (10,409)
Ending balances (in shares) at Sep. 30, 2025 7,350,567   7,350,567