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DERIVATIVE FINANCIAL INSTRUMENTS - Interest rate contracts not designated as hedging instruments (Details) - Not designated - Interest rate swap - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
DERIVATIVE FINANCIAL INSTRUMENTS
Gross gains	$ 7,564	$ 13,571
Gross losses	(7,564)	$ (13,571)
Other assets
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative asset notional amount	119,370		$ 122,313
Derivative financial assets fair value	8,560		15,360
Other assets \| Commercial Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative asset notional amount	115,378		122,313
Derivative financial assets fair value	8,496		15,360
Other assets \| Financial Institutions Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative asset notional amount	3,992
Derivative financial assets fair value	64
Other liabilities
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative liability notional amount	119,370		122,313
Derivative financial liabilities fair value	(8,560)		(15,360)
Other liabilities \| Commercial Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative liability notional amount	3,992
Derivative financial liabilities fair value	64
Other liabilities \| Financial Institutions Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative liability notional amount	115,378		122,313
Derivative financial liabilities fair value	$ (8,496)		$ (15,360)