| 借用金(劣後特約付借入金を除く)の純増減(△) | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 借用金(劣後特約付借入金を除く)の純増減(△)、営業活動によるキャッシュ・フロー、銀行業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Net increase (decrease) in borrowed money (excluding subordinated borrowings) | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Net increase (decrease) in borrowed money (excluding subordinated borrowings)-OpeCF-BNK | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |