Available-for-Sale Securities, at Fair Value Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Debt Securities, Available-for-sale [Abstract] | ||||
| Proceeds from sales of available-for-sale securities | $ 1,672,928 | $ 2,678,050 | $ 3,719,959 | $ 5,092,318 |
| Amortized cost of available-for-sale securities sold | 1,711,928 | 2,644,706 | 3,778,523 | 5,109,376 |
| Gross realized gains | 1,559 | 47,994 | 9,754 | 56,725 |
| Gross realized losses | (40,559) | (14,649) | (68,317) | (73,783) |
| Total realized (losses) gains on sales, net | $ (39,000) | $ 33,345 | $ (58,563) | $ (17,058) |
| X | ||||||||||
- Definition The total amount of amortized cost of securities, categorized neither as held-to-maturity nor trading securities, sold during the reporting period. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
|
| X | ||||||||||
- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|