| Exposure to credit risk on loan commitments and financial guarantee contracts | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Exposure to credit risk on loan commitments and financial guarantee contracts at beginning of period | en | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Exposure to credit risk on loan commitments and financial guarantee contracts at end of period | en | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |