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Securities (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items]
Realized (loss) gain on sale of securities										$ (5,500)	$ 1,500
Interest income from securities	$ 0	$ 0	$ 0	$ 0	$ 1,219	$ 2,625	$ 4,700	$ 6,054	$ 0	14,598	39,055
Payments and proceeds received on securities									0	468,171	140,228
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Interest income from securities										14,600	39,100
CMBS (Held-to-maturity Securities) [Member]
Debt Securities, Available-for-sale [Line Items]
Interest income from securities										4,100	11,500
(CBMS) Fair Value Option [Member]
Debt Securities, Available-for-sale [Line Items]
Interest income from securities										$ 10,500	27,600
Restatement Adjustment [Member]
Debt Securities, Available-for-sale [Line Items]
Proceeds from payments received on held-to-maturity securities reclassified									(146,500)		(6,700)
Payments and proceeds received on securities									295,700		97,900
Payments received on securities reclassified									$ 26,000		$ 35,600

X

- Definition

Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages).

+ References

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Amount of interest income, amortization of premium and accretion of discount, on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in net income (trading); classified as operating.

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