| その他の経常収益の主要な内訳 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| その他の経常収益の主要な内訳、銀行業 [テキストブロック] | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| その他経常収益の主要な内訳 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/ConsolidatedInterim/role/label | http://www.xbrl.org/2003/role/link |
| その他経常収益の主要な内訳 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/NonConsolidatedInterim/role/label | http://www.xbrl.org/2003/role/link |
| その他経常収益の主要な内訳 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/ConsolidatedQuarterly/role/label | http://www.xbrl.org/2003/role/link |
| その他経常収益の主要な内訳 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/NonConsolidatedQuarterly/role/label | http://www.xbrl.org/2003/role/link |
| Major components of other income | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Major components of other income-BNK [text block] | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Major components of other income | en | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/ConsolidatedInterim/role/label | http://www.xbrl.org/2003/role/link |
| Major components of other income | en | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/NonConsolidatedInterim/role/label | http://www.xbrl.org/2003/role/link |
| Major components of other income | en | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/ConsolidatedQuarterly/role/label | http://www.xbrl.org/2003/role/link |
| Major components of other income | en | http://disclosure.edinet-fsa.go.jp/jppfs/bnk/NonConsolidatedQuarterly/role/label | http://www.xbrl.org/2003/role/link |