DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS - Securities in Unrealized Loss Position (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Continuous unrealized loss position, fair value [Abstract]
One year or greater	$ 597,652	$ 706,839
Less than one year	4,468,844	1,095,724
Continuous unrealized loss position, Fair Value, Total	5,066,496	1,802,563
Continuous unrealized loss position, aggregate loss [Abstract]
One year or greater	4,259	5,320
Less than one year	19,711	2,055
Unrealized Losses, Total	$ 23,970	$ 7,375