DERIVATIVE FINANCIAL INSTRUMENTS (Back-to-back loan swaps balance sheet category and fair values) (Details) - Back-to-Back Loan Swaps - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other assets
Derivative [Line Items]
Notional Amount	$ 428,782	$ 440,719
Fair Value	25,801	43,422
Other liabilities
Derivative [Line Items]
Notional Amount	428,782	440,719
Fair Value	$ (25,801)	$ (43,422)
Weighted Average Receive Rate | Other assets
Derivative [Line Items]
Weighted Average Receive and Pay Rate (as a percent)	4.49%	4.46%
Weighted Average Receive Rate | Other liabilities
Derivative [Line Items]
Weighted Average Receive and Pay Rate (as a percent)	2.41%	2.46%
Weighted Average Pay Rate | Other assets
Derivative [Line Items]
Weighted Average Receive and Pay Rate (as a percent)	2.41%	2.46%
Weighted Average Pay Rate | Other liabilities
Derivative [Line Items]
Weighted Average Receive and Pay Rate (as a percent)	4.49%	4.46%