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Contingencies and Commitments (Details) - CLP ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Off-balance sheet accounts    
Foreign office guarantees and standby letters of credit $ 285,035 $ 279,362
Confirmed foreign letters of credit 64,970 64,044
Issued foreign letters of credit 94,313 152,118
Performance bonds 2,220,828 2,150,307
Undrawn credit lines 7,240,406 7,572,687
Other commitments 60,609 148,190
Transactions on behalf of third parties    
Collections 168,353 137,259
Third-party resources managed by the Bank:    
Financial assets managed on behalf of third parties 7,121 39,714
Financial assets acquired on its own behalf 133,794 174,022
Fiduciary activities    
Securities held in safe custody in the Bank 13,623,725 9,586,026
Securities held in safe custody in other entities 7,105,587 5,607,815
Total $ 31,004,741 $ 25,911,544