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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
DERIVATIVE FINANCIAL INSTRUMENTS
Gross gains	$ 2,874	$ 1,610	$ 10,438	$ 15,181
Gross losses	(2,874)	$ (1,610)	(10,438)	$ (15,181)
Other assets
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative asset notional amount	118,237		118,237		$ 122,313
Derivative financial assets fair value	10,694		10,694		15,360
Other assets \| Commercial Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative asset notional amount	114,281		114,281		122,313
Derivative financial assets fair value	10,672		10,672		15,360
Other assets \| Financial Institutions Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative asset notional amount	3,956		3,956
Derivative financial assets fair value	22		22
Other liabilities
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative liability notional amount	118,237		118,237		122,313
Derivative financial liabilities fair value	(10,694)		(10,694)		(15,360)
Other liabilities \| Commercial Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative liability notional amount	3,956		3,956
Derivative financial liabilities fair value	22		22
Other liabilities \| Financial Institutions Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative liability notional amount	114,281		114,281		122,313
Derivative financial liabilities fair value	$ (10,672)		$ (10,672)		$ (15,360)