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DERIVATIVE FINANCIAL INSTRUMENTS - Interest Rate Futures Positions (Details) - Short [Member] - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Repurchase Agreement Funding Hedges [Member] | Eurodollar Future [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount   $ 100,000,000
Entry Rate   2.86%
Weighted Average Effective Rate   1.63%
Open Equity   $ (2,464,000)
Repurchase Agreement Funding Hedges [Member] | Year 2020 Expiration [Member] | Eurodollar Future [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount   $ 120,000,000
Entry Rate   2.90%
Weighted Average Effective Rate   1.67%
Open Equity   $ (1,480,000)
Repurchase Agreement Funding Hedges [Member] | Year 2020 Expiration [Member] | Treasury Note Future [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount   $ 20,000,000
Entry Rate   1.96%
Weighted Average Effective Rate   2.06%
Open Equity   $ 88,000
Repurchase Agreement Funding Hedges [Member] | Year 2021 Expiration [Member] | Eurodollar Future [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount   $ 80,000,000
Entry Rate   2.80%
Weighted Average Effective Rate   1.57%
Open Equity   $ (984,000)
Junior Subordinated Debt Funding Hedges [Member] | Eurodollar Future [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 1,000,000 $ 19,500,000
Entry Rate 1.02% 1.92%
Weighted Average Effective Rate 0.20% 1.68%
Open Equity $ (8,000) $ (46,000)
Junior Subordinated Debt Funding Hedges [Member] | Year 2020 Expiration [Member] | Eurodollar Future [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount   $ 19,500,000
Entry Rate   1.92%
Weighted Average Effective Rate   1.68%
Open Equity   $ (46,000)
Junior Subordinated Debt Funding Hedges [Member] | Year 2021 Expiration [Member] | Eurodollar Future [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 1,000,000  
Entry Rate 1.02%  
Weighted Average Effective Rate 0.20%  
Open Equity $ (8,000)