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BORROWINGS (Details)
12 Months Ended
Dec. 31, 2022
USD ($)
Institution
Dec. 31, 2021
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Subordinated notes $ 174,000,000    
Overnight FHLB advances 805,000,000    
Federal funds purchased 200,000,000    
Loans pledged as collateral 5,600,000,000    
Federal Home Loan Bank, maximum borrowing capacity 2,400,000,000    
Federal Home Loan Bank, additional credit available 315,000,000    
Unsecured debt $ 245,000,000    
Number of financial institutions | Institution 5    
Securities pledged as collateral $ 186,300,000    
Minimum      
Debt Instrument [Line Items]      
Unsecured debt 20,000,000    
Maximum      
Debt Instrument [Line Items]      
Unsecured debt $ 100,000,000    
Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Debt instrument basis point rate 5.90%    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit, borrowing capacity     $ 20,000,000.0
Revolving Credit Facility | 90 Day LIBOR      
Debt Instrument [Line Items]      
Debt instrument basis point rate     0.50%
Subordinated Notes Due 2030      
Debt Instrument [Line Items]      
Subordinated notes $ 24,000,000 $ 25,600,000  
Line of credit facility, Interest rate 6.00%    
Secured debt $ 171,000,000 $ 166,000,000  
Subordinated Notes Due 2030 | Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Debt instrument basis point rate 2.04% 5.90%  
Subordinated Notes Due 2032      
Debt Instrument [Line Items]      
Subordinated notes $ 150,000,000    
Interest rate (as a percent) 3.50%    
Overnight FHLB Advance      
Debt Instrument [Line Items]      
Interest rate (as a percent) 4.65%    
Federal funds purchased      
Debt Instrument [Line Items]      
Interest rate (as a percent) 4.55%    
Federal Reserve Bank advances      
Debt Instrument [Line Items]      
Secured debt $ 345,000,000    
Outstanding borrowings 0    
Unsecured federal funds      
Debt Instrument [Line Items]      
Unsecured debt 100,000,000    
Additional Unsecured Debt 100,000,000    
FFI      
Debt Instrument [Line Items]      
Long-term line of credit 20,000,000.0 $ 18,500,000  
FFI | Subordinated Notes Due 2030      
Debt Instrument [Line Items]      
Subordinated notes $ 174,000,000