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Risk Management - Price Risk (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
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  
EaR reasonable defeasance period (in months) 3 months 3 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   $ 35,170,799 $ 34,728,678
Total Liabilities   29,602,665 29,286,549
Up to 1 month      
Price Risk      
Total Assets   6,513,502 7,648,907
Total Liabilities   15,076,530 14,411,541
Between 1 and 3 months      
Price Risk      
Total Assets   2,829,211 3,269,423
Total Liabilities   3,143,236 2,908,922
Between 3 and 12 months      
Price Risk      
Total Assets   6,962,831 6,105,000
Total Liabilities   3,710,248 3,972,838
Due after 1 years but within 3 years      
Price Risk      
Total Assets   6,209,428 5,871,734
Total Liabilities   1,715,760 2,258,233
Due after 3 years but within 5 years      
Price Risk      
Total Assets   3,356,147 3,052,837
Total Liabilities   1,425,571 1,214,502
Due after 5 years      
Price Risk      
Total Assets   9,299,680 8,780,777
Total Liabilities   4,531,320 4,520,513
Current accounts and other demand deposits      
Price Risk      
Total Liabilities   8,959,941 8,354,085
Current accounts and other demand deposits | Up to 1 month      
Price Risk      
Total Liabilities   8,959,941 8,354,085
Transactions in the course of payment      
Price Risk      
Total Liabilities     8,841
Transactions in the course of payment | Up to 1 month      
Price Risk      
Total Liabilities     8,841
Instrument sold under repurchase agreements and security lending      
Price Risk      
Total Liabilities   10,267 19,901
Instrument sold under repurchase agreements and security lending | Up to 1 month      
Price Risk      
Total Liabilities   10,267 19,901
Savings accounts and time deposits      
Price Risk      
Total Liabilities   10,189,893 10,674,528
Savings accounts and time deposits | Up to 1 month      
Price Risk      
Total Liabilities   5,294,456 5,129,350
Savings accounts and time deposits | Between 1 and 3 months      
Price Risk      
Total Liabilities   2,317,792 2,303,488
Savings accounts and time deposits | Between 3 and 12 months      
Price Risk      
Total Liabilities   2,555,579 3,083,258
Savings accounts and time deposits | Due after 1 years but within 3 years      
Price Risk      
Total Liabilities   21,536 157,610
Savings accounts and time deposits | Due after 3 years but within 5 years      
Price Risk      
Total Liabilities   311 570
Savings accounts and time deposits | Due after 5 years      
Price Risk      
Total Liabilities   219 252
Derivative instruments under hedge-accounting treatment      
Price Risk      
Total Liabilities   1,419,543 1,509,301
Derivative instruments under hedge-accounting treatment | Up to 1 month      
Price Risk      
Total Liabilities   352 2,232
Derivative instruments under hedge-accounting treatment | Between 1 and 3 months      
Price Risk      
Total Liabilities   3,968 2,616
Derivative instruments under hedge-accounting treatment | Between 3 and 12 months      
Price Risk      
Total Liabilities   286,519 249,632
Derivative instruments under hedge-accounting treatment | Due after 1 years but within 3 years      
Price Risk      
Total Liabilities   452,960 659,389
Derivative instruments under hedge-accounting treatment | Due after 3 years but within 5 years      
Price Risk      
Total Liabilities   75,237 88,029
Derivative instruments under hedge-accounting treatment | Due after 5 years      
Price Risk      
Total Liabilities   600,507 507,403
Inter-banking loans      
Price Risk      
Total Liabilities   1,189,797 1,029,266
Inter-banking loans | Up to 1 month      
Price Risk      
Total Liabilities   506,703 559,625
Inter-banking loans | Between 1 and 3 months      
Price Risk      
Total Liabilities   553,663 359,768
Inter-banking loans | Between 3 and 12 months      
Price Risk      
Total Liabilities   129,431 109,873
Long-term debt      
Price Risk      
Total Liabilities   7,649,781 7,414,233
Long-term debt | Up to 1 month      
Price Risk      
Total Liabilities   158,085 104,135
Long-term debt | Between 1 and 3 months      
Price Risk      
Total Liabilities   266,895 242,016
Long-term debt | Between 3 and 12 months      
Price Risk      
Total Liabilities   727,798 525,037
Long-term debt | Due after 1 years but within 3 years      
Price Risk      
Total Liabilities   1,217,226 1,423,061
Long-term debt | Due after 3 years but within 5 years      
Price Risk      
Total Liabilities   1,349,337 1,107,502
Long-term debt | Due after 5 years      
Price Risk      
Total Liabilities   3,930,440 4,012,482
Other liabilities      
Price Risk      
Total Liabilities   183,443 276,394
Other liabilities | Up to 1 month      
Price Risk      
Total Liabilities   146,726 233,372
Other liabilities | Between 1 and 3 months      
Price Risk      
Total Liabilities   918 1,034
Other liabilities | Between 3 and 12 months      
Price Risk      
Total Liabilities   10,921 5,038
Other liabilities | Due after 1 years but within 3 years      
Price Risk      
Total Liabilities   24,038 18,173
Other liabilities | Due after 3 years but within 5 years      
Price Risk      
Total Liabilities   686 18,401
Other liabilities | Due after 5 years      
Price Risk      
Total Liabilities   154 376
Maximum      
Price Risk      
Value-at-Risk used value $ 3,180    
Earnings-at-Risk used value   80,402  
Minimum      
Price Risk      
Value-at-Risk used value 610    
Earnings-at-Risk used value   28,438  
Average      
Price Risk      
Value-at-Risk used value $ 1,720    
Earnings-at-Risk used value   60,301  
Cash and due from banks      
Price Risk      
Total Assets   1,028,014 1,396,536
Cash and due from banks | Up to 1 month      
Price Risk      
Total Assets   1,028,014 1,396,536
Transactions in the course of collection      
Price Risk      
Total Assets   223,360 189,208
Transactions in the course of collection | Up to 1 month      
Price Risk      
Total Assets   223,360 189,208
Securities borrowed or purchased under agreements to resell      
Price Risk      
Total Assets   19,992  
Securities borrowed or purchased under agreements to resell | Up to 1 month      
Price Risk      
Total Assets   19,992  
Derivative instruments under hedge-accounting treatment      
Price Risk      
Total Assets   1,329,112 1,519,394
Derivative instruments under hedge-accounting treatment | Up to 1 month      
Price Risk      
Total Assets   30,328 283,576
Derivative instruments under hedge-accounting treatment | Between 1 and 3 months      
Price Risk      
Total Assets   146,775 14,860
Derivative instruments under hedge-accounting treatment | Between 3 and 12 months      
Price Risk      
Total Assets   225,883 170,891
Derivative instruments under hedge-accounting treatment | Due after 1 years but within 3 years      
Price Risk      
Total Assets   335,756 495,340
Derivative instruments under hedge-accounting treatment | Due after 3 years but within 5 years      
Price Risk      
Total Assets   51,087 52,134
Derivative instruments under hedge-accounting treatment | Due after 5 years      
Price Risk      
Total Assets   539,283 502,593
Inter-banking loans      
Price Risk      
Total Assets   764,847 1,206,490
Inter-banking loans | Up to 1 month      
Price Risk      
Total Assets   533,101 964,250
Inter-banking loans | Between 1 and 3 months      
Price Risk      
Total Assets   49,573 86,029
Inter-banking loans | Between 3 and 12 months      
Price Risk      
Total Assets   150,253 136,434
Inter-banking loans | Due after 1 years but within 3 years      
Price Risk      
Total Assets   31,920 19,777
Loans to customers      
Price Risk      
Total Assets   30,200,566 29,987,787
Loans to customers | Up to 1 month      
Price Risk      
Total Assets   4,669,573 4,808,706
Loans to customers | Between 1 and 3 months      
Price Risk      
Total Assets   2,595,012 3,163,029
Loans to customers | Between 3 and 12 months      
Price Risk      
Total Assets   5,636,496 5,740,836
Loans to customers | Due after 1 years but within 3 years      
Price Risk      
Total Assets   5,619,230 5,219,586
Loans to customers | Due after 3 years but within 5 years      
Price Risk      
Total Assets   3,089,002 2,929,046
Loans to customers | Due after 5 years      
Price Risk      
Total Assets   8,591,253 8,126,584
Financial assets available-for-sale      
Price Risk      
Total Assets   1,604,908 429,263
Financial assets available-for-sale | Up to 1 month      
Price Risk      
Total Assets   9,134 6,631
Financial assets available-for-sale | Between 1 and 3 months      
Price Risk      
Total Assets   37,851 5,505
Financial assets available-for-sale | Between 3 and 12 months      
Price Risk      
Total Assets   950,199 56,839
Financial assets available-for-sale | Due after 1 years but within 3 years      
Price Risk      
Total Assets   222,522 137,031
Financial assets available-for-sale | Due after 3 years but within 5 years      
Price Risk      
Total Assets   216,058 71,657
Financial assets available-for-sale | Due after 5 years      
Price Risk      
Total Assets   $ 169,144 $ 151,600