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BORROWED FUNDS - Senior Notes (Details) - USD ($)
3 Months Ended
May 19, 2021
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Senior notes, net   $ 14,717,000 $ 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  
Stated interest rate 2.75% 2.75%  
Debt issuance costs $ 337,000    
Senior notes, net $ 14,663,000 $ 14,717,000 $ 14,701,000
Amortization of debt issuance costs   $ 16,000  
Effective interest rate   3.23%