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Borrowings and Borrowing Capacity - Additional Information (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2022
USD ($)
bank
quarter
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]        
Number of banks containing unsecured federal funds lines of credit | bank     7  
Unsecured federal funds line of credit     $ 227,500  
Loans pledged as collateral     4,077,484 $ 4,825,359
Subordinated notes     107,800 106,957
Subordinated notes issued     109,500  
Write off of deferred debt issuance cost $ 755      
Junior subordinated debentures     $ 41,158 40,602
Maximum        
Debt Instrument [Line Items]        
Maximum interest deferment period on junior subordinated debentures | quarter     20  
Paycheck Protection Program        
Debt Instrument [Line Items]        
Long-term debt     $ 0 $ 27,144
Stated rate       0.35%
Federal Reserve Bank Discount Window Facility        
Debt Instrument [Line Items]        
Unused borrowing capacity, amount     510,724  
Federal Reserve Bank Discount Window Facility | Asset Pledged as Collateral        
Debt Instrument [Line Items]        
Loans pledged as collateral     $ 679,897  
Fixed-to-Floating Rate Subordinated Notes due 2026        
Debt Instrument [Line Items]        
Subordinated notes issued   $ 50,000    
Current Interest Rate   6.50%    
Fixed-to-Floating Rate Subordinated Notes due 2026 | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Description of floating rate basis   three-month LIBOR    
Interest rate   5.345%