| Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | en-US | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance | en-US | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |
| Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |