OTHER INCOME, ASSETS AND LIABILITIES - Schedule of Accretion and Other Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accretion and other amortization:
Accretion of servicer advance investment and receivable interest income	$ 77,640	$ 76,043
Accretion of excess mortgage servicing rights income	9,359	31,418
Accretion of net discount on securities and loans	92,708	88,984
Amortization of deferred financing costs	(1,874)	(3,574)
Amortization of discount on notes and bonds payable	(462)	(447)
Accretion of loan discount and premium amortization, net	$ 177,371	$ 192,424