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BORROWED FUNDS - Senior Notes (Details) - USD ($)
3 Months Ended 9 Months Ended
May 19, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt Instrument [Line Items]            
Senior notes, net   $ 14,749,000   $ 14,749,000   $ 14,701,000
Senior Notes with an aggregate par value of $15,000,000; bearing interest at 2.75% with an effective interest rate of 3.23%; maturing in June 2026            
Debt Instrument [Line Items]            
Aggregate par value $ 15,000,000.0 $ 15,000,000   $ 15,000,000    
Stated interest rate 2.75% 2.75%   2.75%    
Debt issuance costs $ 337,000          
Senior notes, net $ 14,663,000 $ 14,749,000   $ 14,749,000   $ 14,701,000
Amortization of debt issuance costs   $ 16,000 $ 15,000 $ 48,000 $ 22,000  
Effective interest rate   3.23%   3.23%