BORROWINGS - Remaining contractual maturity of the repurchase agreements (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	$ 23,123
U.S. Treasury Securities [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	23,123
Overnight and Continuous [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	23,123
Overnight and Continuous [Member] | U.S. Treasury Securities [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	23,123
Upto 30 Days [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	0
Upto 30 Days [Member] | U.S. Treasury Securities [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	0
30 to 90 Days [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	0
30 to 90 Days [Member] | U.S. Treasury Securities [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	0
Greater than 90 Days [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	0
Greater than 90 Days [Member] | U.S. Treasury Securities [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	$ 0