FAIR VALUE MEASUREMENTS - Quantitative Information about Level 3 Nonrecurring Assets (Details) - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	$ 6,980,202	$ 6,883,360
Discount for costs to sell | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measurement input	1000.00%	10.00%
Discount for costs to sell | Fair Value, Measurements, Nonrecurring | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measurement input	10.00%	10.00%
Appraisal adjustments | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measurement input	0.00%	0.00%
Appraisal adjustments | Fair Value, Measurements, Nonrecurring | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measurement input	0.00%	0.00%
Substandard | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	$ 79	$ 109