MORTGAGE LOANS (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Mortgage loans
Mortgage loans holdings	$ 5,677,667
Amount that would become due in remainder of 2015, if loans are called at their next call dates	121,100
Amount that would become due in 2016 through 2020, if loans are called at their next call dates	953,000
Amount that would become due in 2021 through 2025, if loans are called at their next call dates	377,900
Amount that would become due after 2025, if loans are called at their next call dates	$ 118,300
Minimum
Mortgage loans
Period for exercise of call options or interest rate reset options	3 years
Maximum
Mortgage loans
Period for exercise of call options or interest rate reset options	10 years