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FAIR VALUE - Summary of Additional Qualitative Information (Details) - Fair Value, Measurements, Nonrecurring
$ in Thousands
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Impaired loans | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement Input (percent)   0.06
Impaired loans | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement Input (percent)   0.20
Impaired loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement Input (percent) 0.06  
Impaired loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement Input (percent) 0.33  
Impaired loans | Appraisal of collateral    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Estimate $ 2,354 $ 3,051
Impaired loans | Appraisal of collateral | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement Input (percent)   0.05
Impaired loans | Appraisal of collateral | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement Input (percent)   0.75
Impaired loans | Appraisal of collateral | Measurement Input, Discount Rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement Input (percent) 0.05  
Impaired loans | Appraisal of collateral | Measurement Input, Discount Rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement Input (percent) 0.30  
Mortgage servicing rights | Measurement Input, Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement Input (percent) 0.095  
Mortgage servicing rights | Measurement Input, Constant Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement Input (percent) 0.127  
Mortgage servicing rights | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Estimate $ 3,116