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FAIR VALUE - Summary of assets and liabilities measured at fair value on a recurring or nonrecurring, the significant unobservable inputs (Details) - Level 3 - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Commercial properties    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Estimate $ 658 $ 658
Commercial and Industrial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Estimate $ 795 $ 1,113
Discount | Commercial properties    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range and weighted average of discount 50.00% 50.00%
Discount Rate | Commercial and Industrial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range and weighted average of discount rate 9.00% 9.00%
Maximum | Commission and Cost to Sell | Commercial properties    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range and weighted average of commission and cost to sell 10.00% 10.00%
Minimum | Commission and Cost to Sell | Commercial properties    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range and weighted average of commission and cost to sell 1.00% 1.00%
Weighted Average | Discount | Commercial properties    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range and weighted average of discount 50.00% 50.00%
Weighted Average | Commission and Cost to Sell | Commercial properties    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range and weighted average of commission and cost to sell 7.00% 7.00%
Weighted Average | Discount Rate | Commercial and Industrial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range and weighted average of discount rate 9.00% 9.00%