| Interest Income, Debt Securities, Operating | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Interest Income, Debt Securities, Operating, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| 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. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |