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Borrowings - Additional Information (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Jun. 30, 2021
USD ($)
agreement
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
agreement
Dec. 31, 2007
USD ($)
security
Dec. 31, 2019
Debt Instrument [Line Items]            
Number of unsecured lines of credit issued | agreement   1   1    
Pledge on certain loan amount   $ 10,000,000   $ 10,000,000    
Line of credit, outstanding amount   0   0    
Remaining borrowing capacity   833,136        
Federal home loan balance   1,193,106        
Borrowings from FHLB totaled   190,401        
Naming applicable municipalities as beneficiaries   37,750   $ 57,250    
Proceeds from issuance of subordinated notes, net of issuance costs   $ 83,516,000 $ 0      
LIBOR            
Debt Instrument [Line Items]            
Line of credit, basis spread on variable rate   2.75%        
Subordinated Debt            
Debt Instrument [Line Items]            
Number of preferred trust securities | security         2  
Floating rate trust preferred securities         $ 10,000,000  
Effective percentage       1.80%   3.44%
Trust preferred securities, interest payment deferment period   5 years        
Proceeds from issuance of subordinated notes, net of issuance costs   $ 83,500,000        
Subordinated Debt | LIBOR            
Debt Instrument [Line Items]            
Line of credit, basis spread on variable rate   1.55%        
Notes Maturing In October 2026 | Subordinated Debt            
Debt Instrument [Line Items]            
Floating rate trust preferred securities $ 50,000,000 $ 85,000,000        
Interest rate, percentage 5.75% 3.25%        
Notes Maturing In October 2026 | Subordinated Debt | LIBOR            
Debt Instrument [Line Items]            
Line of credit, basis spread on variable rate 4.55% 2.58%        
Line of Credit | Overnight Borrowing Agreements            
Debt Instrument [Line Items]            
Line of credit, outstanding amount   $ 0   $ 0