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Goodwill and Acquired Intangible Assets - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2006
Goodwill [Line Items]            
Goodwill $ 59,946,000 $ 59,946,000 $ 59,946,000      
Amortization of intangible assets $ 757,000 955,000 1,153,000      
Core Deposits [Member]            
Goodwill [Line Items]            
Acquired finite-lived intangible assets, weighted average useful life (Month) 120 months          
Amortization of intangible assets $ 757,000 $ 955,000 $ 1,153,000      
Valley Ridge Financial Corp. [Member]            
Goodwill [Line Items]            
Goodwill           $ 13,700,000
County Bank Corp [Member]            
Goodwill [Line Items]            
Goodwill         $ 38,900,000  
County Bank Corp [Member] | Core Deposits [Member]            
Goodwill [Line Items]            
Acquired finite-lived intangible assets, weighted average useful life (Month) 10 years          
Community Shores Bank Corporation [Member]            
Goodwill [Line Items]            
Goodwill       $ 7,300,000    
Community Shores Bank Corporation [Member] | Core Deposits [Member]            
Goodwill [Line Items]            
Acquired finite-lived intangible assets, weighted average useful life (Month) 8 years