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FAIR VALUE MEASUREMENTS - Non-recurring Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Capitalized servicing rights $ 12,300 $ 11,500
Non-recurring | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired loans 8,831 4,892
Capitalized servicing rights 14,152 11,891
Total Assets $ 22,983 $ 16,783