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Fair Value of Financial Assets and Liabilities-Level 3 Reconciliation (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CLP ($)
Dec. 31, 2017
CLP ($)
Level 3 Reconciliation      
Assets at beginning of period   $ 32,561,437 $ 31,357,304
Assets at end of period $ 51,351,567 35,617,447 32,561,437
Level 3      
Level 3 Reconciliation      
Assets at beginning of period   54,327 85,019
Gain (Loss) Recognized in Income   2,715 (4,193)
Gain (Loss) Recognized in Equity   (253) 1,133
Purchases   48,740 12,368
Sales   (56,582) (39,376)
Transfer from Level 1 and 2     5,057
Transfer to Level 1 and 2   (4,971) (5,681)
Assets at end of period   43,976 54,327
Level 3 | Financial assets held-for-trading      
Level 3 Reconciliation      
Assets at beginning of period   8,012 8,960
Gain (Loss) Recognized in Income   176 (7)
Purchases   48,740 7,446
Sales   (36,062) (10,772)
Transfer from Level 1 and 2     2,385
Assets at end of period   20,866 8,012
Level 3 | Financial assets held-for-trading | Other instruments issued in Chile      
Level 3 Reconciliation      
Assets at beginning of period   8,012 8,960
Gain (Loss) Recognized in Income   176 (7)
Purchases   48,740 7,446
Sales   (36,062) (10,772)
Transfer from Level 1 and 2     2,385
Assets at end of period   20,866 8,012
Level 3 | Financial assets available-for-sale      
Level 3 Reconciliation      
Assets at beginning of period   46,315 76,059
Gain (Loss) Recognized in Income     (4,186)
Gain (Loss) Recognized in Equity     1,133
Purchases     4,922
Sales     (28,604)
Transfer from Level 1 and 2     2,672
Transfer to Level 1 and 2     (5,681)
Assets at end of period     46,315
Level 3 | Financial assets available-for-sale | Other instruments issued in Chile      
Level 3 Reconciliation      
Assets at beginning of period   46,265 76,005
Gain (Loss) Recognized in Income     (4,186)
Gain (Loss) Recognized in Equity     1,137
Purchases     4,922
Sales     (28,604)
Transfer from Level 1 and 2     2,672
Transfer to Level 1 and 2     (5,681)
Assets at end of period     46,265
Level 3 | Financial assets available-for-sale | Instruments issued by foreign institutions      
Level 3 Reconciliation      
Assets at beginning of period   50 54
Gain (Loss) Recognized in Equity     (4)
Assets at end of period     50
Level 3 | Financial assets at fair value through other comprehensive income      
Level 3 Reconciliation      
Assets at beginning of period   46,315  
Gain (Loss) Recognized in Income   2,539  
Gain (Loss) Recognized in Equity   (253)  
Sales   (20,520)  
Transfer to Level 1 and 2   (4,971)  
Assets at end of period   23,110 46,315
Level 3 | Financial assets at fair value through other comprehensive income | Other instruments issued in Chile | Debt instruments      
Level 3 Reconciliation      
Assets at beginning of period   46,265  
Gain (Loss) Recognized in Income   2,539  
Gain (Loss) Recognized in Equity   (292)  
Sales   (20,520)  
Transfer to Level 1 and 2   (4,971)  
Assets at end of period   23,021 46,265
Level 3 | Financial assets at fair value through other comprehensive income | Instruments issued by foreign institutions | Trading equity instruments      
Level 3 Reconciliation      
Assets at beginning of period   50  
Gain (Loss) Recognized in Equity   39  
Assets at end of period   $ 89 $ 50