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Business Combinations - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 30, 2022
Nov. 30, 2021
Nov. 24, 2021
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]              
Restricted stock shares paid out in cash (in shares)         2,500    
Goodwill         $ 114,231 $ 113,835 $ 62,840
Goodwill, purchase accounting adjustments         36    
Riverview              
Business Acquisition [Line Items]              
Shares of acquirer ratio of common stock   48.33%          
Fair value of common stock issued   $ 142,192          
Restricted stock shares paid out in cash (in shares)   2,500          
Payments to acquire businesses gross   $ 792          
Business combination consideration transferred   142,984          
Goodwill   51,031          
Finite-lived intangible assets acquired   3,400          
Customer list intangible   $ 2,200          
Acquired finite-lived intangible assets, weighted average useful life   10 years          
Fair value of purchased loans   $ 837,505          
Pro forma earnings           57,150 35,139
Riverview | Excluded Acquisition-related Costs              
Business Acquisition [Line Items]              
Pro forma earnings             3,100
Impairment loss             $ 24,800
Riverview | Common Stock              
Business Acquisition [Line Items]              
Fair value of common stock issued   $ 142,200          
Per share price (in dollars per share)   $ 31.46 $ 30.76        
Options outstanding to purchase common stock (in shares)     172,964        
Riverview | Stock Awards              
Business Acquisition [Line Items]              
Payments to acquire businesses gross   $ 776          
Riverview | Fractional Shares              
Business Acquisition [Line Items]              
Payments to acquire businesses gross   $ 16          
Brunswick Bancorp Acquisition | Forecast              
Business Acquisition [Line Items]              
Equity interests issuable, (in shares)       $ 0.598      
Equity interests issuable, (in dollars per share)       $ 18.00      
Managing Partners Insurance Acquisitions              
Business Acquisition [Line Items]              
Goodwill acquired $ 360       360 0  
Managing Partners Insurance Acquisitions | Customer Lists Intangible              
Business Acquisition [Line Items]              
Finite-lived intangible assets acquired         $ 541 $ 0  
Finite-lived intangibles acquired $ 541