BORROWINGS - Remaining contractual maturity of the repurchase agreements (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	$ 13,982
U.S. Treasury securities [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	13,982
Overnight and Continuous [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	13,982
Overnight and Continuous [Member] | U.S. Treasury securities [Member]
Repurchase agreements and repurchase-to-maturity transactions:
Remaining Contractual Maturity of the Agreements	13,982
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