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Related Party Transactions (Details) - CLP ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Amount covered by guarantee:    
Maximum % of assets held as trading securities or investments by production companies 50.00%  
Related parties    
Minimum participation to be related parties" 5% of shares    
Gross loans $ 463,223 $ 362,026
Allowance for loan losses (1,623) (1,262)
Net loans 461,600 360,764
Contingent loans:    
Guarantees and sureties 25,673 13,028
Letters of credits 1,464 165
Bank guarantees 57,528 43,859
Undrawn credit lines 82,237 84,432
Other contingencies loans   2,000
Total contingent loans 166,902 143,484
Provision for contingencies loans (346) (326)
Contingent loans, net 166,556 143,158
Amount covered by guarantee:    
Mortgage 134,944 148,774
Pledge 1,417 2,903
Others 55,383 36,883
Net collateral 191,744 188,560
Related parties | Commercial loans    
Minimum participation to be related parties" 5% of shares    
Gross loans 422,263 323,609
Related parties | Residential mortgage loans    
Minimum participation to be related parties" 5% of shares    
Gross loans 33,695 31,921
Related parties | Consumer loans    
Minimum participation to be related parties" 5% of shares    
Gross loans 7,265 6,496
Production and Services Companies    
Minimum participation to be related parties" 5% of shares    
Gross loans 243,989 149,838
Allowance for loan losses (988) (622)
Net loans 243,001 149,216
Contingent loans:    
Guarantees and sureties 4,527 4,941
Letters of credits 294 165
Bank guarantees 34,457 24,095
Undrawn credit lines 53,151 55,607
Total contingent loans 92,429 84,808
Provision for contingencies loans (217) (190)
Contingent loans, net 92,212 84,618
Amount covered by guarantee:    
Mortgage 27,928 19,083
Pledge 1,417 2,900
Others 39,022 20,607
Net collateral 68,367 42,590
Production and Services Companies | Commercial loans    
Minimum participation to be related parties" 5% of shares    
Gross loans 243,989 149,838
Investment Companies    
Minimum participation to be related parties" 5% of shares    
Gross loans 169,403 165,475
Allowance for loan losses (394) (347)
Net loans 169,009 165,128
Contingent loans:    
Guarantees and sureties 21,146 8,087
Letters of credits 1,170  
Bank guarantees 23,071 19,764
Undrawn credit lines 13,907 12,928
Other contingencies loans   2,000
Total contingent loans 59,294 42,779
Provision for contingencies loans (81) (104)
Contingent loans, net 59,213 42,675
Amount covered by guarantee:    
Mortgage 53,835 81,419
Others 14,186 14,533
Net collateral 68,021 95,952
Investment Companies | Commercial loans    
Minimum participation to be related parties" 5% of shares    
Gross loans 169,403 165,475
Individuals    
Minimum participation to be related parties" 5% of shares    
Gross loans 49,831 46,713
Allowance for loan losses (241) (293)
Net loans 49,590 46,420
Contingent loans:    
Undrawn credit lines 15,179 15,897
Total contingent loans 15,179 15,897
Provision for contingencies loans (48) (32)
Contingent loans, net 15,131 15,865
Amount covered by guarantee:    
Mortgage 53,181 48,272
Pledge   3
Others 2,175 1,743
Net collateral 55,356 50,018
Individuals | Commercial loans    
Minimum participation to be related parties" 5% of shares    
Gross loans 8,871 8,296
Individuals | Residential mortgage loans    
Minimum participation to be related parties" 5% of shares    
Gross loans 33,695 31,921
Individuals | Consumer loans    
Minimum participation to be related parties" 5% of shares    
Gross loans $ 7,265 $ 6,496