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DERIVATIVE FINANCIAL INSTRUMENTS - Interest rate contracts not designated as hedging instruments (Details) - Not designated - Interest rate swap - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
DERIVATIVE FINANCIAL INSTRUMENTS
Gross gains	$ 24,758	$ 13,537	$ 1,758
Gross losses	(24,758)	(13,500)	$ (1,758)
Net gains		37
Other assets
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative asset notional amount	122,313	138,356
Derivative financial assets fair value	15,360	8,642
Other assets | Commercial Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative asset notional amount	122,313	114,140
Derivative financial assets fair value	15,360	8,532
Other assets | Financial Institutions Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative asset notional amount		24,216
Derivative financial assets fair value		110
Other liabilities
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative liability notional amount	122,313	138,356
Derivative financial liabilities fair value	(15,360)	(8,642)
Other liabilities | Commercial Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative liability notional amount		24,216
Derivative financial liabilities fair value		(110)
Other liabilities | Financial Institutions Borrower
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative liability notional amount	122,313	114,140
Derivative financial liabilities fair value	$ (15,360)	$ (8,532)

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