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Mergers - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 01, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]          
Goodwill       $ 51,912 $ 51,912
Wellesley          
Business Acquisition [Line Items]          
Number of banking offices 6        
Business combination, share conversion ratio 0.580        
Total consideration paid $ 88,800        
Common stock issued related to merger | shares 1,502,814        
Business combination, share price | $ / shares $ 58.00        
Merger expenses   $ 4,400 $ 4,600    
Total assets acquired $ 985,600        
Total liabilities assumed 917,600        
Goodwill 20,700        
Business combination, provision for credit losses $ 8,600