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Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
segment
item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 18, 2022
$ / shares
Number of banking centres | item 63      
Operating segment | segment 1      
Reportable Segment | segment 1      
Deferred tax assets $ 23,065,000 $ 18,972,000    
Retained earnings $ 252,011,000 236,579,000    
Period from due date after which accrual of interest income is discontinued 90 days      
Goodwill and Core Deposit Intangible        
Amortization of core deposit intangibles $ 644,000 494,000 $ 539,000  
Subsequent Events        
Percentage of forfeiture assumption for group grant 5.00%      
Core Deposits        
Goodwill and Core Deposit Intangible        
Carrying value of the intangible asset $ 16,300,000      
Amortization of core deposit intangibles 644,000 494,000 $ 539,000  
Expected future annual amortization expense:        
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2022 2,600,000      
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2023 2,500,000      
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2024 2,300,000      
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2025 2,100,000      
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2026 $ 1,800,000      
GCFC/ABC Bank | Core Deposits        
Goodwill and Core Deposit Intangible        
Useful life (in years) 10 years      
Remaining intangible asset   $ 2,200,000    
West Suburban Bancorp, Inc | Core Deposits        
Goodwill and Core Deposit Intangible        
Intangible asset recorded $ 14,800,000      
Subsequent Event        
Subsequent Events        
Cash dividend declared (per share) | $ / shares       $ 0.05