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Loans and Advance to Banks - Provisions for loans to banks (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Reconciliation of provision for loans to banks      
Balance at beginning of period   $ (1,173,187)  
Balance at end of period $ (1,234,943) (760,021) $ (1,173,187)
Accumulated Amortization and Impairment      
Reconciliation of provision for loans to banks      
Balance at beginning of period   259 353
Provisions established (released), net   5 (94)
Balance at end of period   264 259
Accumulated Amortization and Impairment | Domestic banks      
Reconciliation of provision for loans to banks      
Balance at beginning of period   49 36
Provisions established (released), net   (30) 13
Balance at end of period   19 49
Accumulated Amortization and Impairment | Foreign banks      
Reconciliation of provision for loans to banks      
Balance at beginning of period   210 317
Provisions established (released), net   35 (107)
Balance at end of period   $ 245 $ 210