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Borrowings - Additional Information (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Oct. 15, 2021
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
agreement
Dec. 31, 2020
USD ($)
agreement
Dec. 31, 2007
USD ($)
security
Sep. 30, 2016
USD ($)
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     879,246,000      
Federal home loan balance     1,245,840,000      
Advances from the FHLB     0 0    
Prepayments of the FHLB borrowings       190,401,000    
Naming applicable municipalities as beneficiaries     $ 27,750,000 $ 57,250,000    
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     1.67% 1.80%    
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 | Subsequent Event            
Debt Instrument [Line Items]            
Interest rate, percentage 5.75%          
Debt instrument, repurchased face amount $ 50,000,000          
Notes Maturing In October 2026 | Subordinated Debt | LIBOR            
Debt Instrument [Line Items]            
Interest rate, percentage           4.55%
Notes Maturing In October 2031 | Subordinated Debt            
Debt Instrument [Line Items]            
Floating rate trust preferred securities   $ 85,000,000        
Interest rate, percentage   3.25%        
Proceeds from issuance of subordinated notes, net of issuance costs   $ 83,500,000        
Notes Maturing In October 2031 | Subordinated Debt | Subsequent Event            
Debt Instrument [Line Items]            
Interest rate, percentage 3.25%          
Proceeds from issuance of subordinated notes, net of issuance costs $ 85,000,000          
Notes Maturing In October 2031 | Subordinated Debt | SOFR            
Debt Instrument [Line Items]            
Line of credit, basis spread on variable rate     2.58%      
Line of Credit | Overnight Borrowing Agreements            
Debt Instrument [Line Items]            
Line of credit, outstanding amount     $ 0 $ 0