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Contingencies and Commitments (Details) - CLP ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Off-balance sheet accounts    
Foreign office guarantees and standby letters of credit $ 341,676 $ 285,035
Confirmed foreign letters of credit 56,764 64,970
Issued foreign letters of credit 388,396 94,313
Performance guarantees 2,232,682 2,220,828
Undrawn credit lines 7,769,325 7,240,406
Other commitments 46,561 60,609
Transactions on behalf of third parties    
Collections 160,367 168,353
Third-party resources managed by the Bank:    
Financial assets managed on behalf of third parties 27,334 7,121
Financial assets acquired on its own behalf 103,319 133,794
Fiduciary activities    
Securities held in safe custody in the Bank 6,930,293 5,738,873
Securities held in safe custody in other entities 13,783,748 14,990,439
Total $ 31,840,465 $ 31,004,741