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Summary of Significant Accounting Policies - Additional Information (Details)
 3 Months Ended 9 Months Ended
Jul. 26, 2024
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Jul. 25, 2024
USD ($)
Office
shares
Dec. 31, 2023
USD ($)
Apr. 30, 2021
shares
Significant Accounting Policies [Line Items]                
Stock issued during period, shares, new issues (in shares) | shares 1,380,000              
Sales price per share (in dollars per share) | $ / shares $ 25              
Issuance of common stock $ 34,500,000     $ 500,000 $ 168,000      
Number of shares each share of Fentura common stock outstanding will be converted into (in shares) | shares           1.35    
Consolidated total assets   $ 2,726,003,000   2,726,003,000     $ 2,576,706,000  
Merger-related expenses   645,000   645,000        
Stock issued during period, value, new issues   $ 165,000 $ 131,000 $ 280,000 $ 428,000      
Stock repurchased during period, shares (in shares) | shares       0        
Stock repurchase program, number of shares authorized to be repurchased (in shares) | shares               375,388
Stock repurchase program, percent of stock outstanding               5.00%
Number of days individually evaluation       60 days        
Plan [Member]                
Significant Accounting Policies [Line Items]                
Consolidated total assets           $ 4,300,000,000    
Number of offices after combination is completed | Office           56    
Directors' Stock Purchase Plan [Member]                
Significant Accounting Policies [Line Items]                
Stock issued during period, shares, new issues (in shares) | shares   3,877   11,582        
Stock issued during period, value, new issues   $ 111,000   $ 330,000        
Employee Stock Purchase Plan [Member]                
Significant Accounting Policies [Line Items]                
Stock issued during period, shares, new issues (in shares) | shares   2,037   6,943        
Stock issued during period, value, new issues   $ 53,000   $ 170,000