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Current Taxes and Deferred Taxes - Effect of deferred taxes on income and equity (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period $ 176,923 $ 129,192 $ 94,240
Income effect (14,314) 35,202 37,198
Equity effect (1,344) 12,529 (2,246)
Deferred tax liability (asset) at end of period 161,265 176,923 129,192
Total debit differences      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 219,174 183,170 147,046
Income effect (15,839) 36,049 36,013
Equity effect (44) (45) 111
Deferred tax liability (asset) at end of period 203,291 219,174 183,170
Allowances for loan losses      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 127,719 115,538 100,734
Income effect (12,276) 12,181 14,804
Deferred tax liability (asset) at end of period 115,443 127,719 115,538
Obligations with agreement to repurchase      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period (968) (968) (968)
Deferred tax liability (asset) at end of period (968) (968) (968)
Personnel provisions      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 11,231 8,150 9,597
Income effect 1,290 3,081 (1,447)
Deferred tax liability (asset) at end of period 12,521 11,231 8,150
Staff vacations      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 6,674 6,268 5,489
Income effect 234 406 779
Deferred tax liability (asset) at end of period 6,908 6,674 6,268
Accrued interest and indexation adjustments from past due loans      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 3,355 4,024 3,738
Income effect 59 (669) 286
Deferred tax liability (asset) at end of period 3,414 3,355 4,024
Staff severance indemnities provision      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 1,854 2,236 2,344
Income effect (352) (337) (117)
Equity effect (45) (45) 9
Deferred tax liability (asset) at end of period 1,457 1,854 2,236
Provisions of credit card expenses      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 12,459 13,628 10,637
Income effect (3,504) (1,169) 2,991
Deferred tax liability (asset) at end of period 8,955 12,459 13,628
Provisions of accrued expenses      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 14,489 11,788 11,466
Income effect 1,869 2,701 220
Equity effect     102
Deferred tax liability (asset) at end of period 16,358 14,489 11,788
Leasing      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 37,119 18,239  
Income effect (4,570) 18,880 18,239
Deferred tax liability (asset) at end of period 32,549 37,119 18,239
Other adjustments      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 5,242 4,267 4,009
Income effect 1,411 975 258
Equity effect 1    
Deferred tax liability (asset) at end of period 6,654 5,242 4,267
Total credit differences      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 42,251 53,978 52,806
Income effect (1,525) 847 (1,185)
Equity effect 1,300 (12,574) 2,357
Deferred tax liability (asset) at end of period 42,026 42,251 53,978
Investments with agreement to repurchase      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 125 125 125
Deferred tax liability (asset) at end of period 125 125 125
Depreciation of property and equipment and investment properties      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 11,815 13,163 14,304
Income effect 2,466 (1,348) (1,141)
Deferred tax liability (asset) at end of period 14,281 11,815 13,163
Adjustment for valuation financial assets available-for-sale      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 1,092 13,667 11,310
Income effect 1    
Equity effect 1,299 (12,575) 2,357
Deferred tax liability (asset) at end of period 2,392 1,092 13,667
Hedge cash adjustment      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 259 259 259
Deferred tax liability (asset) at end of period 259 259 259
Leasing equipment      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period (1,094) (1,094) 1,898
Income effect     (2,992)
Deferred tax liability (asset) at end of period (1,094) (1,094) (1,094)
Transitory assets      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 4,772 3,795 3,633
Income effect 714 977 162
Deferred tax liability (asset) at end of period 5,486 4,772 3,795
Derivative instruments adjustments      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 7,707 10,279 5,983
Income effect (3,329) (2,572) 4,296
Deferred tax liability (asset) at end of period 4,378 7,707 10,279
Assets received in lieu of payments      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period (1,390) (1,630) (1,434)
Income effect 830 240 (196)
Deferred tax liability (asset) at end of period (560) (1,390) (1,630)
Accrued interest to effective rate      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 2,247 2,560 2,303
Income effect (644) (313) 257
Deferred tax liability (asset) at end of period 1,603 2,247 2,560
Intangible assets amortization      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 6,090 6,640 7,141
Income effect (587) (550) (501)
Deferred tax liability (asset) at end of period 5,503 6,090 6,640
Other adjustments      
Effect of deferred taxes on income and equity      
Deferred tax liability (asset) at beginning of period 10,628 6,214 7,284
Income effect (976) 4,413 (1,070)
Equity effect 1 1  
Deferred tax liability (asset) at end of period $ 9,653 $ 10,628 $ 6,214