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Loans and Accounts Receivable at Amortised Cost (Details 2) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance $ 30,213,414  
Transfers    
Gross carrying amount, Ending balance 32,671,515 $ 30,213,414
Expected credit losses allowances, Beginning balance 882,414  
Transfers    
Expected credit losses allowances, Ending balance 896,095 882,414
Mortgages [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 10,150,981 9,096,895
Transfers    
Transfers to stage 2
Transfers to stage 3
Transfers to stage 3
Transfers to stage 1
Transfers to stage 2
Transfers to stage 1
Net changes on financial assets 1,072,202 1,271,127
Writte-off (34,184) (31,664)
Foreign exchange adjustments and others 73,996 (185,377)
Gross carrying amount, Ending balance 11,262,995 10,150,981
Expected credit losses allowances, Beginning balance 91,270 108,019
Transfers    
Transfers to stage 2 3,330
Transfers to stage 3 8,677
Transfers to stage 3 5,538
Transfers to stage 1 (5,992)
Transfers to stage 2 (7,889)
Transfers to stage 1 (141)
Net changes of the exposure and modifications in the credit risk 39,468 392
Writte-off (34,184) (13,548)
Foreign exchange adjustments and others 4,505 (7,116)
Expected credit losses allowances, Ending balance 101,059 91,270
Stage 1 [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 26,913,508  
Transfers    
Gross carrying amount, Ending balance 29,041,636 26,913,508
Expected credit losses allowances, Beginning balance 153,640  
Transfers    
Expected credit losses allowances, Ending balance 133,269 153,640
Stage 1 [Member] | Mortgages [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 9,258,962  
Transfers    
Gross carrying amount, Ending balance 10,275,966 9,258,962
Expected credit losses allowances, Beginning balance 9,006  
Transfers    
Expected credit losses allowances, Ending balance 8,446 9,006
Stage 1 [Member] | Mortgages [Member] | Collective [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 9,258,962 8,191,229
Transfers    
Transfers to stage 2 (481,646) (87,473)
Transfers to stage 3 (60,329) (64,949)
Transfers to stage 3
Transfers to stage 1 361,293 162,432
Transfers to stage 2
Transfers to stage 1 2,338 2,612
Net changes on financial assets 1,131,941 1,226,259
Writte-off
Foreign exchange adjustments and others 63,407 (171,148)
Gross carrying amount, Ending balance 10,275,966 9,258,962
Expected credit losses allowances, Beginning balance 9,006 14,602
Transfers    
Transfers to stage 2 (3,318) (516)
Transfers to stage 3 (311) (383)
Transfers to stage 3
Transfers to stage 1 13,849 263
Transfers to stage 2
Transfers to stage 1 193 91
Net changes of the exposure and modifications in the credit risk (11,007) 1,601
Writte-off
Foreign exchange adjustments and others 34 (6,652)
Expected credit losses allowances, Ending balance 8,446 9,006
Stage 2 [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 1,796,790  
Transfers    
Gross carrying amount, Ending balance 1,995,733 1,796,790
Expected credit losses allowances, Beginning balance 125,114  
Transfers    
Expected credit losses allowances, Ending balance 121,261 125,114
Stage 2 [Member] | Mortgages [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 447,496  
Transfers    
Gross carrying amount, Ending balance 457,948 447,496
Expected credit losses allowances, Beginning balance 15,102  
Transfers    
Expected credit losses allowances, Ending balance 14,509 15,102
Stage 2 [Member] | Mortgages [Member] | Collective [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 447,496 469,349
Transfers    
Transfers to stage 2 481,646 87,473
Transfers to stage 3
Transfers to stage 3 (333,706) (54,488)
Transfers to stage 1 (361,293) (162,432)
Transfers to stage 2 250,896 79,159
Transfers to stage 1
Net changes on financial assets (35,200) 34,653
Writte-off
Foreign exchange adjustments and others 8,109 (6,218)
Gross carrying amount, Ending balance 457,948 447,496
Expected credit losses allowances, Beginning balance 15,102 20,227
Transfers    
Transfers to stage 2 3,318 3,846
Transfers to stage 3
Transfers to stage 3 (12,598) (2,518)
Transfers to stage 1 (13,849) (6,255)
Transfers to stage 2 29,303 2,296
Transfers to stage 1
Net changes of the exposure and modifications in the credit risk (6,825) 575
Writte-off
Foreign exchange adjustments and others 58 (3,069)
Expected credit losses allowances, Ending balance 14,509 15,102
Stage 3 [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 1,503,116  
Transfers    
Gross carrying amount, Ending balance 1,634,146 1,503,116
Expected credit losses allowances, Beginning balance 603,660  
Transfers    
Expected credit losses allowances, Ending balance 641,565 603,660
Stage 3 [Member] | Mortgages [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 444,523  
Transfers    
Gross carrying amount, Ending balance 529,081 444,523
Expected credit losses allowances, Beginning balance 67,162  
Transfers    
Expected credit losses allowances, Ending balance 78,104 67,162
Stage 3 [Member] | Mortgages [Member] | Collective [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 444,523 436,317
Transfers    
Transfers to stage 2
Transfers to stage 3 60,329 64,949
Transfers to stage 3 333,706 54,488
Transfers to stage 1
Transfers to stage 2 (250,896) (79,159)
Transfers to stage 1 (2,338) (2,612)
Net changes on financial assets (24,539) 10,215
Writte-off (34,184) (31,664)
Foreign exchange adjustments and others 2,480 (8,011)
Gross carrying amount, Ending balance 529,081 444,523
Expected credit losses allowances, Beginning balance 67,162 73,190
Transfers    
Transfers to stage 2
Transfers to stage 3 311 9,060
Transfers to stage 3 12,598 8,056
Transfers to stage 1
Transfers to stage 2 (29,303) (10,185)
Transfers to stage 1 (193) (232)
Net changes of the exposure and modifications in the credit risk 57,300 (1,784)
Writte-off (34,184) (13,548)
Foreign exchange adjustments and others 4,413 2,605
Expected credit losses allowances, Ending balance $ 78,104 $ 67,162