INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ 50,403	$ 13,321	$ 39,632	$ 37,155	$ 56,680	$ 44,892	$ 45,673	$ 46,799	$ 140,511	$ 194,044	$ 101,145
Effective income tax rate (as a percent)									24.60%	33.50%	22.60%
Tax credits generated from investments in affordable housing partnerships and other investments									$ 126,200	$ 67,600	$ 85,700
Additional tax expense (benefit) recorded directly to stockholders' equity									$ 1,055	$ 3,291	$ 6,513