FAIR VALUE MEASUREMENTS - Fair Value Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Inputs, Level 1
Assets:
Loans, net	$ 0	$ 0
Fair Value, Inputs, Level 2
Assets:
Loans, net	0	0
Fair Value, Inputs, Level 3
Assets:
Loans, net	6,980,202	6,883,360
Estimate of Fair Value Measurement
Assets:
Loans, net	6,980,202	6,883,360
Estimate of Fair Value Measurement | Fair Value, Measurements, Nonrecurring
Assets:
Loans, net	79	109
Total assets	79	109
Estimate of Fair Value Measurement | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 1
Assets:
Loans, net	0	0
Total assets	0	0
Estimate of Fair Value Measurement | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2
Assets:
Loans, net	0	0
Total assets	0	0
Estimate of Fair Value Measurement | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Assets:
Loans, net	79	109
Total assets	79	109
Changes Measurement | Fair Value, Measurements, Nonrecurring
Assets:
Loans, net	(1,180)	710
Total assets	$ (1,180)	$ 710