CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Investments, Fair Value Disclosure	$ 8,156,878,000	$ 6,680,832,000
ASSETS
Covered loans net of premiums, discounts and deferred fees and costs	$ 201,376,000	$ 503,118,000
Stockholders' equity:
Common stock, par value (in Dollars per Share)	$ 0.01	$ 0.01
Common stock, shares authorized (in Shares)	400,000,000	400,000,000
Common stock, shares issued (in Shares)	99,141,374	106,848,185
Common stock, shares outstanding (in Shares)	99,141,374	106,848,185