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Risk Management - Portfolio Concentration Credit Risk Industry Sector (Details) - CLP ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Cash and due from banks    
Credit risk    
Financial assets $ 1,057,393 $ 1,408,167
Cash and due from banks | Financial Services    
Credit risk    
Financial assets 894,972 1,289,666
Cash and due from banks | Chilean Central Bank    
Credit risk    
Financial assets 162,421 118,501
Financial assets held-for-trading    
Credit risk    
Financial assets 1,538,578 1,379,958
Financial assets held-for-trading | Financial Services    
Credit risk    
Financial assets 221,414 897,612
Financial assets held-for-trading | Chilean Central Bank    
Credit risk    
Financial assets 1,062,558 423,565
Financial assets held-for-trading | Government    
Credit risk    
Financial assets 254,606 58,781
Cash collateral on securities borrowed and reverse repurchase agreements    
Credit risk    
Financial assets 91,641 55,703
Cash collateral on securities borrowed and reverse repurchase agreements | Financial Services    
Credit risk    
Financial assets 32,555 6,280
Cash collateral on securities borrowed and reverse repurchase agreements | Government    
Credit risk    
Financial assets 2,576  
Cash collateral on securities borrowed and reverse repurchase agreements | Trade    
Credit risk    
Financial assets 24,717 20,154
Cash collateral on securities borrowed and reverse repurchase agreements | Manufacturing    
Credit risk    
Financial assets   6,259
Cash collateral on securities borrowed and reverse repurchase agreements | Mining    
Credit risk    
Financial assets 12,522 2,978
Cash collateral on securities borrowed and reverse repurchase agreements | Electricity, Gas and Water    
Credit risk    
Financial assets 7,464 14,236
Cash collateral on securities borrowed and reverse repurchase agreements | Agriculture and livestock    
Credit risk    
Financial assets 13 19
Cash collateral on securities borrowed and reverse repurchase agreements | Fishing    
Credit risk    
Financial assets 672 531
Cash collateral on securities borrowed and reverse repurchase agreements | Transportation and telecommunications    
Credit risk    
Financial assets 7,382 3,800
Cash collateral on securities borrowed and reverse repurchase agreements | Services    
Credit risk    
Financial assets 3,740  
Cash collateral on securities borrowed and reverse repurchase agreements | Other    
Credit risk    
Financial assets   1,446
Loans and advances to banks    
Credit risk    
Financial assets 760,285 1,173,446
Loans and advances to banks | Financial Services    
Credit risk    
Financial assets 409,369 473,105
Loans and advances to banks | Chilean Central Bank    
Credit risk    
Financial assets 350,916 700,341
Central Bank of Chile    
Credit risk    
Financial assets 350,916 700,341
Central Bank of Chile | Chilean Central Bank    
Credit risk    
Financial assets 350,916 700,341
Domestic banks    
Credit risk    
Financial assets 120,017 208,403
Domestic banks | Financial Services    
Credit risk    
Financial assets 120,017 208,403
Foreign banks    
Credit risk    
Financial assets 289,352 264,702
Foreign banks | Financial Services    
Credit risk    
Financial assets 289,352 264,702
Loans to customers    
Credit risk    
Financial assets 25,451,513 25,398,424
Loans to customers | Financial Services    
Credit risk    
Financial assets 1,851,649 2,116,203
Loans to customers | Retail (Individuals)    
Credit risk    
Financial assets 11,490,695 10,899,389
Loans to customers | Trade    
Credit risk    
Financial assets 2,035,129 2,243,474
Loans to customers | Manufacturing    
Credit risk    
Financial assets 1,399,692 1,561,737
Loans to customers | Mining    
Credit risk    
Financial assets 422,176 432,822
Loans to customers | Electricity, Gas and Water    
Credit risk    
Financial assets 565,695 566,438
Loans to customers | Agriculture and livestock    
Credit risk    
Financial assets 1,354,069 1,184,869
Loans to customers | Fishing    
Credit risk    
Financial assets 145,266 264,042
Loans to customers | Transportation and telecommunications    
Credit risk    
Financial assets 1,612,930 1,636,994
Loans to customers | Construction    
Credit risk    
Financial assets 1,493,373 1,647,862
Loans to customers | Services    
Credit risk    
Financial assets 1,964,238 1,937,428
Loans to customers | Other    
Credit risk    
Financial assets 1,116,601 907,166
Commercial loans    
Credit risk    
Financial assets 13,960,818 14,499,035
Commercial loans | Financial Services    
Credit risk    
Financial assets 1,851,649 2,116,203
Commercial loans | Trade    
Credit risk    
Financial assets 2,035,129 2,243,474
Commercial loans | Manufacturing    
Credit risk    
Financial assets 1,399,692 1,561,737
Commercial loans | Mining    
Credit risk    
Financial assets 422,176 432,822
Commercial loans | Electricity, Gas and Water    
Credit risk    
Financial assets 565,695 566,438
Commercial loans | Agriculture and livestock    
Credit risk    
Financial assets 1,354,069 1,184,869
Commercial loans | Fishing    
Credit risk    
Financial assets 145,266 264,042
Commercial loans | Transportation and telecommunications    
Credit risk    
Financial assets 1,612,930 1,636,994
Commercial loans | Construction    
Credit risk    
Financial assets 1,493,373 1,647,862
Commercial loans | Services    
Credit risk    
Financial assets 1,964,238 1,937,428
Commercial loans | Other    
Credit risk    
Financial assets 1,116,601 907,166
Residential mortgage loans    
Credit risk    
Financial assets 7,477,236 6,924,766
Residential mortgage loans | Retail (Individuals)    
Credit risk    
Financial assets 7,477,236 6,924,766
Consumer loans    
Credit risk    
Financial assets 4,013,459 3,974,623
Consumer loans | Retail (Individuals)    
Credit risk    
Financial assets 4,013,459 3,974,623
Financial assets available-for-sale    
Credit risk    
Financial assets 1,526,315 374,470
Financial assets available-for-sale | Financial Services    
Credit risk    
Financial assets 1,107,037 192,847
Financial assets available-for-sale | Chilean Central Bank    
Credit risk    
Financial assets 207,474 20,944
Financial assets available-for-sale | Government    
Credit risk    
Financial assets 148,894 38,256
Financial assets available-for-sale | Trade    
Credit risk    
Financial assets 31,833 52,638
Financial assets available-for-sale | Manufacturing    
Credit risk    
Financial assets 8,589  
Financial assets available-for-sale | Mining    
Credit risk    
Financial assets 7,662 7,943
Financial assets available-for-sale | Electricity, Gas and Water    
Credit risk    
Financial assets 2,883 10,690
Financial assets available-for-sale | Agriculture and livestock    
Credit risk    
Financial assets 6,972 51,152
Financial assets available-for-sale | Transportation and telecommunications    
Credit risk    
Financial assets 4,971  
Instruments issued by the Chilean Government and Central Bank | Financial assets held-for-trading    
Credit risk    
Financial assets 1,317,164 482,346
Instruments issued by the Chilean Government and Central Bank | Financial assets held-for-trading | Chilean Central Bank    
Credit risk    
Financial assets 1,062,558 423,565
Instruments issued by the Chilean Government and Central Bank | Financial assets held-for-trading | Government    
Credit risk    
Financial assets 254,606 58,781
Instruments issued by the Chilean Government and Central Bank | Financial assets available-for-sale    
Credit risk    
Financial assets 356,368 59,200
Instruments issued by the Chilean Government and Central Bank | Financial assets available-for-sale | Chilean Central Bank    
Credit risk    
Financial assets 207,474 20,944
Instruments issued by the Chilean Government and Central Bank | Financial assets available-for-sale | Government    
Credit risk    
Financial assets 148,894 38,256
Other instruments issued in Chile | Financial assets held-for-trading    
Credit risk    
Financial assets 221,092 897,227
Other instruments issued in Chile | Financial assets held-for-trading | Financial Services    
Credit risk    
Financial assets 221,092 897,227
Other instruments issued in Chile | Financial assets available-for-sale    
Credit risk    
Financial assets 1,168,913 314,043
Other instruments issued in Chile | Financial assets available-for-sale | Financial Services    
Credit risk    
Financial assets 1,106,003 191,620
Other instruments issued in Chile | Financial assets available-for-sale | Trade    
Credit risk    
Financial assets 31,833 52,638
Other instruments issued in Chile | Financial assets available-for-sale | Manufacturing    
Credit risk    
Financial assets 8,589  
Other instruments issued in Chile | Financial assets available-for-sale | Mining    
Credit risk    
Financial assets 7,662 7,943
Other instruments issued in Chile | Financial assets available-for-sale | Electricity, Gas and Water    
Credit risk    
Financial assets 2,883 10,690
Other instruments issued in Chile | Financial assets available-for-sale | Agriculture and livestock    
Credit risk    
Financial assets 6,972 51,152
Other instruments issued in Chile | Financial assets available-for-sale | Transportation and telecommunications    
Credit risk    
Financial assets 4,971  
Instruments issued by foreign institutions | Financial assets held-for-trading    
Credit risk    
Financial assets 322 385
Instruments issued by foreign institutions | Financial assets held-for-trading | Financial Services    
Credit risk    
Financial assets 322 385
Instruments issued by foreign institutions | Financial assets available-for-sale    
Credit risk    
Financial assets 1,034 1,227
Instruments issued by foreign institutions | Financial assets available-for-sale | Financial Services    
Credit risk    
Financial assets 1,034 1,227
Derivative contracts for trading purposes    
Credit risk    
Financial assets 1,220,092 875,949
Derivative contracts for trading purposes | Financial Services    
Credit risk    
Financial assets 890,611 710,074
Derivative contracts for trading purposes | Trade    
Credit risk    
Financial assets 53,903 36,546
Derivative contracts for trading purposes | Manufacturing    
Credit risk    
Financial assets 15,909 7,999
Derivative contracts for trading purposes | Mining    
Credit risk    
Financial assets 3,400 29,043
Derivative contracts for trading purposes | Electricity, Gas and Water    
Credit risk    
Financial assets 4,763 9,609
Derivative contracts for trading purposes | Agriculture and livestock    
Credit risk    
Financial assets 3,205 5,508
Derivative contracts for trading purposes | Fishing    
Credit risk    
Financial assets 228 360
Derivative contracts for trading purposes | Transportation and telecommunications    
Credit risk    
Financial assets 9,664 403
Derivative contracts for trading purposes | Construction    
Credit risk    
Financial assets 41 2,019
Derivative contracts for trading purposes | Services    
Credit risk    
Financial assets 238,368 74,388
Derivative contracts for trading purposes | Forwards    
Credit risk    
Financial assets 506,614 163,716
Derivative contracts for trading purposes | Forwards | Financial Services    
Credit risk    
Financial assets 245,873 80,886
Derivative contracts for trading purposes | Forwards | Trade    
Credit risk    
Financial assets 7,666 4,698
Derivative contracts for trading purposes | Forwards | Manufacturing    
Credit risk    
Financial assets 9,860 4,651
Derivative contracts for trading purposes | Forwards | Mining    
Credit risk    
Financial assets 2,561 179
Derivative contracts for trading purposes | Forwards | Electricity, Gas and Water    
Credit risk    
Financial assets 84 121
Derivative contracts for trading purposes | Forwards | Agriculture and livestock    
Credit risk    
Financial assets 54 182
Derivative contracts for trading purposes | Forwards | Fishing    
Credit risk    
Financial assets 219 7
Derivative contracts for trading purposes | Forwards | Transportation and telecommunications    
Credit risk    
Financial assets 2,368 403
Derivative contracts for trading purposes | Forwards | Construction    
Credit risk    
Financial assets 29 12
Derivative contracts for trading purposes | Forwards | Services    
Credit risk    
Financial assets 237,900 72,577
Derivative contracts for trading purposes | Swaps    
Credit risk    
Financial assets 710,123 709,091
Derivative contracts for trading purposes | Swaps | Financial Services    
Credit risk    
Financial assets 643,735 627,621
Derivative contracts for trading purposes | Swaps | Trade    
Credit risk    
Financial assets 44,773 30,806
Derivative contracts for trading purposes | Swaps | Manufacturing    
Credit risk    
Financial assets 5,563 2,910
Derivative contracts for trading purposes | Swaps | Mining    
Credit risk    
Financial assets 839 28,864
Derivative contracts for trading purposes | Swaps | Electricity, Gas and Water    
Credit risk    
Financial assets 4,679 9,488
Derivative contracts for trading purposes | Swaps | Agriculture and livestock    
Credit risk    
Financial assets 2,862 5,234
Derivative contracts for trading purposes | Swaps | Fishing    
Credit risk    
Financial assets 9 353
Derivative contracts for trading purposes | Swaps | Transportation and telecommunications    
Credit risk    
Financial assets 7,244  
Derivative contracts for trading purposes | Swaps | Construction    
Credit risk    
Financial assets   2,007
Derivative contracts for trading purposes | Swaps | Services    
Credit risk    
Financial assets 419 1,808
Derivative contracts for trading purposes | Call Options    
Credit risk    
Financial assets 514 1,558
Derivative contracts for trading purposes | Call Options | Financial Services    
Credit risk    
Financial assets 269 732
Derivative contracts for trading purposes | Call Options | Trade    
Credit risk    
Financial assets 32 451
Derivative contracts for trading purposes | Call Options | Manufacturing    
Credit risk    
Financial assets 90 285
Derivative contracts for trading purposes | Call Options | Agriculture and livestock    
Credit risk    
Financial assets 67 90
Derivative contracts for trading purposes | Call Options | Transportation and telecommunications    
Credit risk    
Financial assets 52  
Derivative contracts for trading purposes | Call Options | Construction    
Credit risk    
Financial assets 1  
Derivative contracts for trading purposes | Call Options | Services    
Credit risk    
Financial assets 3  
Derivative contracts for trading purposes | Put Options    
Credit risk    
Financial assets 2,841 1,584
Derivative contracts for trading purposes | Put Options | Financial Services    
Credit risk    
Financial assets 734 835
Derivative contracts for trading purposes | Put Options | Trade    
Credit risk    
Financial assets 1,432 591
Derivative contracts for trading purposes | Put Options | Manufacturing    
Credit risk    
Financial assets 396 153
Derivative contracts for trading purposes | Put Options | Agriculture and livestock    
Credit risk    
Financial assets 222 2
Derivative contracts for trading purposes | Put Options | Construction    
Credit risk    
Financial assets 11  
Derivative contracts for trading purposes | Put Options | Services    
Credit risk    
Financial assets 46 3
Hedge derivative contracts    
Credit risk    
Financial assets 27,849 63,700
Hedge derivative contracts | Financial Services    
Credit risk    
Financial assets 27,849 63,700
Hedge derivative contracts | Swaps    
Credit risk    
Financial assets 27,849 63,700
Hedge derivative contracts | Swaps | Financial Services    
Credit risk    
Financial assets $ 27,849 $ 63,700