Current　research　on　commercial　bank　credit　risk　mainly　focuses　on　the　risk　of　loans　and　advances　without　considering　the　treasury　operations　and　off-balance-sheet　credit　business　that　also　carry　credit　risk.　Ignoring　the　correlation　between　diverse　risk　factors　results　in　the　biased　integration　of　credit　risk.　In　this　work,　we　aggregate　the　credit　risk　of　commercial　banks　based　on　three　risk　factors　using　a　vine　copula.　Our　empirical　results　show　that　banks　that　are　not　global　systemically　important　banks　are　confronted　with　higher　credit　risk　than　global　systemically　important　banks.　In　addition,　the　risk　of　loans-and-advances　business　is　positively　correlated　with　treasury　operations　risk　and　negatively　correlated　with　off-balance-sheet　credit　business.　While　the　risk　of　loans-and-advances　business　is　significant,　the　risks　of　treasury　operations　and　off-balance-sheet　credit　business　still　play　an　indispensable　role　in　(and　contain　vital　information　about)　credit　risk.　In　addition,　banking　as　a　system　can　achieve　lower　credit　risk,　but　this　effect　is　weakened　under　the　extreme　lower-tail　risk.