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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY OF FINANCING RECEIVABLES - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
property
loan
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2019
USD ($)
property
loan
Jun. 30, 2018
loan
Dec. 31, 2018
USD ($)
property
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Number of loans modified by troubled debt restructuring | loan 0 1 1 1  
Number of loans with subsequent default | loan 0 0      
Foreclosed real estate $ 3,576   $ 3,576   $ 4,149
Carrying value of collateralized consumer loans $ 1,531,723   $ 1,531,723   $ 1,475,827
Troubled debt restructuring amount   $ 514      
Residential Real Estate          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Number of foreclosed properties | property 5   5   5
Foreclosed real estate $ 1,300   $ 1,300   $ 1,300
Consumer and Other          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Carrying value of collateralized consumer loans $ 554   $ 554   $ 682