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BORROWINGS (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Institution
Dec. 31, 2021
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2021
USD ($)
Debt Instrument [Line Items]        
Overnight FHLB advances $ 149,000,000      
Long-term line of credit 0      
Loans pledged as collateral 5,000,000,000.0      
Federal Home Loan Bank, maximum borrowing capacity 2,900,000,000      
Federal Home Loan Bank, additional credit available $ 315,000,000      
Interest rate (as a percent) 1.66%      
Unsecured debt $ 245,000,000      
Number of financial institutions | Institution 5      
Unused lines of credit $ 3,200,000,000 $ 3,100,000,000    
FHLB, average daily balance of borrowings outstanding 3,400,000     $ 1,000,000
Secured debt   $ 166,000,000    
FHLB Advances Maturing in October 2020        
Debt Instrument [Line Items]        
Secured debt 133,000,000      
Minimum        
Debt Instrument [Line Items]        
Unsecured debt 20,000,000      
Maximum        
Debt Instrument [Line Items]        
Unsecured debt 100,000,000      
Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit, borrowing capacity     $ 20,000,000  
Revolving Credit Facility | 90 Day LIBOR        
Debt Instrument [Line Items]        
Debt instrument basis point rate     0.50%  
U.S. Treasury        
Debt Instrument [Line Items]        
Securities pledged as collateral 900,000      
Subordinated Notes Due 2030        
Debt Instrument [Line Items]        
Subordinated notes $ 174,000,000      
Line of credit facility, Interest rate 6.00%      
Secured debt $ 171,000,000      
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%      
FFI        
Debt Instrument [Line Items]        
Long-term line of credit   $ 18,500,000    
FFI | Subordinated Notes Due 2030        
Debt Instrument [Line Items]        
Subordinated notes $ 24,000,000 $ 26,000,000