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Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Retirement Benefits [Abstract]      
Employees contribution 100.00%    
Corporation matching contribution, percent 100.00%    
Employee contribution, percent 5.00%    
Defined Contribution Plan Disclosure [Line Items]      
Performance bonus expense $ 1,063 $ 1,101 $ 1,070
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 (152) (128)
Plan expenses 792 813 764
Accumulated other comprehensive income includes net unrecognized pension cost before income taxes 2,550    
Corporation self-funded medical plan 100    
Medical expenses 3,297 1,868 2,445
Defined Benefit Plan Disclosure [Line Items]      
Performance Bonus Expense - Executive Plan $ 253 165  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense     171
Unrecognized compensation expense, period for recognition 2 years 8 months 15 days    
Other Postretirement Benefits Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Plan expenses $ 352 373 $ 355
Restricted Stock | Isabella Bank Corporation Restricted Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 86 $ 14  
Unrecognized compensation expense $ 319    
Unrecognized compensation expense, period for recognition 2 years 8 months 15 days    
Minimum [Member] | Restricted Stock | Isabella Bank Corporation Restricted Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum award as a percentage of salary 25.00%    
Maximum [Member] | Restricted Stock | Isabella Bank Corporation Restricted Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum award as a percentage of salary 40.00%    
Safe Harbor 401(k) [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Vesting percentage 100.00%    
Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Investment allocation in securities 50.00%    
Equity Collective Trust [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Investment allocation in securities 50.00%