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Provisions - Undrawn Credit Lines - Outstanding Exposures (Details) - Undrawn credit lines [Member] - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]    
Exposure as at beginning of period $ 7,769,325 $ 7,240,406
Net change on exposures 329,925 601,223
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments (228,990) (72,304)
Exposure as at ending of period 7,870,260 7,769,325
Stage 1 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 1,279,611 1,199,593
Net change on exposures (182,381) 111,426
Transfer to Stage 1 162,455 130,936
Transfer to Stage 2 (118,673) (166,795)
Transfer to Stage 3 (57) (120)
Foreign exchange adjustments (5,837) 4,571
Exposure as at ending of period 1,135,118 1,279,611
Stage 1 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 5,512,504 5,086,210
Net change on exposures 668,090 621,021
Transfer to Stage 1 1,058,685 491,857
Transfer to Stage 2 (593,536) (561,588)
Transfer to Stage 3 (1,970) (1,928)
Foreign exchange adjustments (209,625) (123,068)
Exposure as at ending of period 6,434,148 5,512,504
Stage 2 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 178,586 147,053
Net change on exposures (50,111) (5,449)
Transfer to Stage 1 (162,453) (130,926)
Transfer to Stage 2 118,848 166,892
Transfer to Stage 3 (365) (217)
Foreign exchange adjustments (1,047) 1,233
Exposure as at ending of period 83,458 178,586
Stage 2 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 786,663 794,449
Net change on exposures (96,818) (114,834)
Transfer to Stage 1 (1,058,572) (488,237)
Transfer to Stage 2 598,413 563,941
Transfer to Stage 3 (9,938) (13,476)
Foreign exchange adjustments (12,102) 44,820
Exposure as at ending of period 207,646 786,663
Stage 3 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 328 411
Net change on exposures (204) (326)
Transfer to Stage 1 (2) (11)
Transfer to Stage 2 (175) (97)
Transfer to Stage 3 422 337
Foreign exchange adjustments (10) 14
Exposure as at ending of period 359 328
Stage 3 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 11,633 12,690
Net change on exposures (8,651) (10,615)
Transfer to Stage 1 (113) (3,619)
Transfer to Stage 2 (4,877) (2,353)
Transfer to Stage 3 11,908 15,404
Foreign exchange adjustments (369) 126
Exposure as at ending of period $ 9,531 $ 11,633