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Risk Management - Price Risk (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CLP ($)
Dec. 31, 2017
CLP ($)
Price Risk      
Confidence level for calculation of value at risk 99.00% 99.00%  
Observation period for calculation of value at risk 1 year 1 year  
Adverse impact period for calculation of earnings at risk 12 months 12 months  
Confidence level for calculation of earnings at risk 97.70% 97.70%  
Fluctuation rate for liquid FX rates 8.00% 8.00%  
Fluctuation rate for illiquid FX rates 30.00% 30.00%  
Portion of tier 1 and tier 2 capital from risk weighted assets 10.00% 10.00%  
Regulatory market risk measurement for trading portfolio as percentage of tier 1 and tier 2 capital limit 100.00% 100.00%  
Risk limit for short-term and long-term portfolio (as a percent) 25.00% 25.00%  
Total Assets   $ 37,507,941 $ 35,170,799
Total Liabilities   32,315,688 29,602,665
Up to 1 month      
Price Risk      
Total Assets   4,615,607 6,513,502
Total Liabilities   15,194,511 15,076,530
Between 1 and 3 months      
Price Risk      
Total Assets   2,684,606 2,829,211
Total Liabilities   2,662,936 3,143,236
Between 3 and 12 months      
Price Risk      
Total Assets   6,579,800 6,962,831
Total Liabilities   5,071,785 3,710,248
Due after 1 years but within 3 years      
Price Risk      
Total Assets   8,749,175 6,209,428
Total Liabilities   2,173,298 1,715,760
Due after 3 years but within 5 years      
Price Risk      
Total Assets   4,210,281 3,356,147
Total Liabilities   2,122,715 1,425,571
Due after 5 years      
Price Risk      
Total Assets   10,668,472 9,299,680
Total Liabilities   5,090,443 4,531,320
Current accounts and other demand deposits      
Price Risk      
Total Liabilities   9,622,073 8,959,941
Current accounts and other demand deposits | Up to 1 month      
Price Risk      
Total Liabilities   9,622,073 8,959,941
Instrument sold under repurchase agreements and security lending      
Price Risk      
Total Liabilities   6,963 10,267
Instrument sold under repurchase agreements and security lending | Up to 1 month      
Price Risk      
Total Liabilities   6,963 10,267
Savings accounts and time deposits      
Price Risk      
Total Liabilities   10,851,767 10,189,893
Savings accounts and time deposits | Up to 1 month      
Price Risk      
Total Liabilities   5,273,096 5,294,456
Savings accounts and time deposits | Between 1 and 3 months      
Price Risk      
Total Liabilities   1,981,221 2,317,792
Savings accounts and time deposits | Between 3 and 12 months      
Price Risk      
Total Liabilities   3,152,103 2,555,579
Savings accounts and time deposits | Due after 1 years but within 3 years      
Price Risk      
Total Liabilities   373,398 21,536
Savings accounts and time deposits | Due after 3 years but within 5 years      
Price Risk      
Total Liabilities   619 311
Savings accounts and time deposits | Due after 5 years      
Price Risk      
Total Liabilities   71,330 219
Derivative instruments under hedge-accounting treatment      
Price Risk      
Total Liabilities   1,513,050 1,419,543
Derivative instruments under hedge-accounting treatment | Up to 1 month      
Price Risk      
Total Liabilities   115 352
Derivative instruments under hedge-accounting treatment | Between 1 and 3 months      
Price Risk      
Total Liabilities   144,525 3,968
Derivative instruments under hedge-accounting treatment | Between 3 and 12 months      
Price Risk      
Total Liabilities   243,151 286,519
Derivative instruments under hedge-accounting treatment | Due after 1 years but within 3 years      
Price Risk      
Total Liabilities   187,522 452,960
Derivative instruments under hedge-accounting treatment | Due after 3 years but within 5 years      
Price Risk      
Total Liabilities   222,201 75,237
Derivative instruments under hedge-accounting treatment | Due after 5 years      
Price Risk      
Total Liabilities   715,536 600,507
Inter-banking loans      
Price Risk      
Total Liabilities   1,496,612 1,189,797
Inter-banking loans | Up to 1 month      
Price Risk      
Total Liabilities   97,661 506,703
Inter-banking loans | Between 1 and 3 months      
Price Risk      
Total Liabilities   268,795 553,663
Inter-banking loans | Between 3 and 12 months      
Price Risk      
Total Liabilities   946,950 129,431
Inter-banking loans | Due after 1 years but within 3 years      
Price Risk      
Total Liabilities   183,206  
Long-term debt      
Price Risk      
Total Liabilities   8,707,933 7,649,781
Long-term debt | Up to 1 month      
Price Risk      
Total Liabilities   101,707 158,085
Long-term debt | Between 1 and 3 months      
Price Risk      
Total Liabilities   267,665 266,895
Long-term debt | Between 3 and 12 months      
Price Risk      
Total Liabilities   724,724 727,798
Long-term debt | Due after 1 years but within 3 years      
Price Risk      
Total Liabilities   1,410,766 1,217,226
Long-term debt | Due after 3 years but within 5 years      
Price Risk      
Total Liabilities   1,899,529 1,349,337
Long-term debt | Due after 5 years      
Price Risk      
Total Liabilities   4,303,542 3,930,440
Other liabilities      
Price Risk      
Total Liabilities   117,290 183,443
Other liabilities | Up to 1 month      
Price Risk      
Total Liabilities   92,896 146,726
Other liabilities | Between 1 and 3 months      
Price Risk      
Total Liabilities   730 918
Other liabilities | Between 3 and 12 months      
Price Risk      
Total Liabilities   4,857 10,921
Other liabilities | Due after 1 years but within 3 years      
Price Risk      
Total Liabilities   18,406 24,038
Other liabilities | Due after 3 years but within 5 years      
Price Risk      
Total Liabilities   366 686
Other liabilities | Due after 5 years      
Price Risk      
Total Liabilities   35 154
Maximum      
Price Risk      
Value-at-Risk used value $ 1,401    
Earnings-at-Risk used value   33,197  
Minimum      
Price Risk      
Value-at-Risk used value 379    
Earnings-at-Risk used value   24,941  
Average      
Price Risk      
Value-at-Risk used value $ 783    
Earnings-at-Risk used value   26,738  
Cash and due from banks      
Price Risk      
Total Assets   844,173 1,028,014
Cash and due from banks | Up to 1 month      
Price Risk      
Total Assets   844,173 1,028,014
Transactions in the course of collection      
Price Risk      
Total Assets   151,701 223,360
Transactions in the course of collection | Up to 1 month      
Price Risk      
Total Assets   151,701 223,360
Securities borrowed or purchased under agreements to resell      
Price Risk      
Total Assets   3,161 19,992
Securities borrowed or purchased under agreements to resell | Up to 1 month      
Price Risk      
Total Assets   3,161 19,992
Derivative instruments under hedge-accounting treatment      
Price Risk      
Total Assets   1,516,670 1,329,112
Derivative instruments under hedge-accounting treatment | Up to 1 month      
Price Risk      
Total Assets   20 30,328
Derivative instruments under hedge-accounting treatment | Between 1 and 3 months      
Price Risk      
Total Assets   140,631 146,775
Derivative instruments under hedge-accounting treatment | Between 3 and 12 months      
Price Risk      
Total Assets   253,266 225,883
Derivative instruments under hedge-accounting treatment | Due after 1 years but within 3 years      
Price Risk      
Total Assets   176,330 335,756
Derivative instruments under hedge-accounting treatment | Due after 3 years but within 5 years      
Price Risk      
Total Assets   229,092 51,087
Derivative instruments under hedge-accounting treatment | Due after 5 years      
Price Risk      
Total Assets   717,331 539,283
Inter-banking loans      
Price Risk      
Total Assets   1,499,974 764,847
Inter-banking loans | Up to 1 month      
Price Risk      
Total Assets   1,262,749 533,101
Inter-banking loans | Between 1 and 3 months      
Price Risk      
Total Assets   79,199 49,573
Inter-banking loans | Between 3 and 12 months      
Price Risk      
Total Assets   133,689 150,253
Inter-banking loans | Due after 1 years but within 3 years      
Price Risk      
Total Assets   24,337 31,920
Loans to customers      
Price Risk      
Total Assets   32,447,692 30,200,566
Loans to customers | Up to 1 month      
Price Risk      
Total Assets   2,305,334 4,669,573
Loans to customers | Between 1 and 3 months      
Price Risk      
Total Assets   2,311,297 2,595,012
Loans to customers | Between 3 and 12 months      
Price Risk      
Total Assets   5,784,455 5,636,496
Loans to customers | Due after 1 years but within 3 years      
Price Risk      
Total Assets   8,402,372 5,619,230
Loans to customers | Due after 3 years but within 5 years      
Price Risk      
Total Assets   3,923,096 3,089,002
Loans to customers | Due after 5 years      
Price Risk      
Total Assets   9,721,138 8,591,253
Financial assets available-for-sale      
Price Risk      
Total Assets     1,604,908
Financial assets available-for-sale | Up to 1 month      
Price Risk      
Total Assets     9,134
Financial assets available-for-sale | Between 1 and 3 months      
Price Risk      
Total Assets     37,851
Financial assets available-for-sale | Between 3 and 12 months      
Price Risk      
Total Assets     950,199
Financial assets available-for-sale | Due after 1 years but within 3 years      
Price Risk      
Total Assets     222,522
Financial assets available-for-sale | Due after 3 years but within 5 years      
Price Risk      
Total Assets     216,058
Financial assets available-for-sale | Due after 5 years      
Price Risk      
Total Assets     $ 169,144
FVOCI      
Price Risk      
Total Assets   1,044,570  
FVOCI | Up to 1 month      
Price Risk      
Total Assets   48,469  
FVOCI | Between 1 and 3 months      
Price Risk      
Total Assets   153,479  
FVOCI | Between 3 and 12 months      
Price Risk      
Total Assets   408,390  
FVOCI | Due after 1 years but within 3 years      
Price Risk      
Total Assets   146,136  
FVOCI | Due after 3 years but within 5 years      
Price Risk      
Total Assets   58,093  
FVOCI | Due after 5 years      
Price Risk      
Total Assets   $ 230,003