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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

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- Definition Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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