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Fair Value of Financial Assets and Liabilities-Level 3 Reconciliation (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Level 3 Reconciliation      
Assets at beginning of period   $ 31,357,304 $ 31,057,596
Assets at end of period $ 52,908,434 32,561,437 31,357,304
Level 3      
Level 3 Reconciliation      
Assets at beginning of period   85,019 114,153
Gain (Loss) Recognized in Income   (4,197) (5,843)
Gain (Loss) Recognized in Equity   1,137 818
Purchases   12,368 28,216
Sales   (39,376) (49,786)
Transfer from Level 1 and 2   5,057 165
Transfer to Level 1 and 2   (5,681) (2,704)
Assets at end of period   54,327 85,019
Level 3 | Financial assets held-for-trading      
Level 3 Reconciliation      
Assets at beginning of period   8,960 18,028
Gain (Loss) Recognized in Income   (7) 28
Purchases   7,446 8,946
Sales   (10,772) (18,042)
Transfer from Level 1 and 2   2,385  
Assets at end of period   8,012 8,960
Level 3 | Financial assets held-for-trading | Other instruments issued in Chile      
Level 3 Reconciliation      
Assets at beginning of period   8,960 18,028
Gain (Loss) Recognized in Income   (7) 28
Purchases   7,446 8,946
Sales   (10,772) (18,042)
Transfer from Level 1 and 2   2,385  
Assets at end of period   8,012 8,960
Level 3 | Financial assets available-for-sale      
Level 3 Reconciliation      
Assets at beginning of period   76,059 96,125
Gain (Loss) Recognized in Income   (4,190) (5,871)
Gain (Loss) Recognized in Equity   1,137 818
Purchases   4,922 19,270
Sales   (28,604) (31,744)
Transfer from Level 1 and 2   2,672 165
Transfer to Level 1 and 2   (5,681) (2,704)
Assets at end of period   46,315 76,059
Level 3 | Financial assets available-for-sale | Other instruments issued in Chile      
Level 3 Reconciliation      
Assets at beginning of period   76,005 96,125
Gain (Loss) Recognized in Income   (4,186) (5,871)
Gain (Loss) Recognized in Equity   1,137 818
Purchases   4,922 19,270
Sales   (28,604) (31,744)
Transfer from Level 1 and 2   2,672 111
Transfer to Level 1 and 2   (5,681) (2,704)
Assets at end of period   46,265 76,005
Level 3 | Financial assets available-for-sale | Instruments issued by foreign institutions      
Level 3 Reconciliation      
Assets at beginning of period   54  
Gain (Loss) Recognized in Income   (4)  
Transfer from Level 1 and 2     54
Assets at end of period   $ 50 $ 54