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Goodwill and Acquired Intangible Assets - Additional Information (Details) - USD ($)
 12 Months Ended
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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   $ 955,000 1,153,000 1,307,000      
Core Deposits [Member]              
Goodwill [Line Items]              
Acquired finite-lived intangible assets, weighted average useful life (Month)   120 months          
Amortization of intangible assets   $ 955,000 $ 1,153,000 $ 1,307,000      
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    
Impairment loss $ 0            
Community Shores Bank Corporation [Member] | Core Deposits [Member]              
Goodwill [Line Items]              
Acquired finite-lived intangible assets, weighted average useful life (Month)   8 years