SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Employee Loans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for employee loans	$ 0
Non-accrual employee loans	0
Material loans past due	0
Loans issued to principal officers, directors, or their affiliates	$ 0
Loans Under Employee Housing Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum service period (in years)	3 years
Loan term (in years)	5 years
Interest rate on loan (as a percent)	7.50%
Loans Under Employee Housing Program | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Authorized loan program amount	$ 10,000
Individual loan original amount limit	$ 50