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Borrowings - Additional Information (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Dec. 31, 2020
USD ($)
line_of_credit
Dec. 31, 2019
USD ($)
line_of_credit
Dec. 31, 2007
USD ($)
security
Debt Instrument [Line Items]        
Number of unsecured lines of credit issued | line_of_credit   1 1  
Pledge on certain loan amount   $ 10,000,000 $ 10,000,000  
Line of credit, outstanding amount   0 0  
Remaining borrowing capacity   797,367,000    
Federal home loan balance   1,182,510,000    
Borrowings from FHLB totaled   190,401,000    
Prepayments totaled   7,851,000    
Naming applicable municipalities as beneficiaries   57,250,000 $ 0  
Qualify for Tier 2 capital amount   $ 10,000    
Qualify for Tier 2 capital percentage   20.00%    
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    
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      
Interest rate, percentage 5.75%      
Notes Maturing In October 2026 | Subordinated Debt | LIBOR        
Debt Instrument [Line Items]        
Line of credit, basis spread on variable rate 4.55%      
Line of Credit | Overnight Borrowing Agreements        
Debt Instrument [Line Items]        
Line of credit, outstanding amount   $ 0 $ 0