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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, 2018
Dec. 31, 2016
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period $ 184,465 $ 176,923
Income effect 4,582 (14,314)
Equity effect 3,793 (1,344)
Deferred tax liability (asset) at end of period 192,840 161,265
Total debit differences    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 227,051 220,564
Income effect 7,929 (16,669)
Equity effect 1,401 (44)
Deferred tax liability (asset) at end of period 236,381 203,851
Allowances for loan losses    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 138,643 127,719
Income effect 3,232 (12,276)
Deferred tax liability (asset) at end of period 141,875 115,443
Personnel provisions    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 12,521 11,231
Income effect 756 1,290
Deferred tax liability (asset) at end of period 13,277 12,521
Staff vacations    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 6,908 6,674
Income effect 333 234
Deferred tax liability (asset) at end of period 7,241 6,908
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 3,414 3,355
Income effect (182) 59
Deferred tax liability (asset) at end of period 3,232 3,414
Staff severance indemnities provision    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 1,457 1,854
Income effect (8) (352)
Equity effect 35 (45)
Deferred tax liability (asset) at end of period 1,484 1,457
Provisions of credit card expenses    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 8,955 12,459
Income effect 858 (3,504)
Deferred tax liability (asset) at end of period 9,813 8,955
Provisions of accrued expenses    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 16,358 14,489
Income effect (3,203) 1,869
Deferred tax liability (asset) at end of period 13,155 16,358
Derivative instruments adjustments    
Effect of deferred taxes on income and equity    
Income effect 1,356  
Deferred tax liability (asset) at end of period 1,356  
Adjustment for valuation and impairment of financial assets at fair value through OCI    
Effect of deferred taxes on income and equity    
Income effect (419)  
Equity effect 1,365  
Deferred tax liability (asset) at end of period 946  
Leasing    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 32,549 37,119
Income effect 10,439 (4,570)
Deferred tax liability (asset) at end of period 42,988 32,549
Other adjustments    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 6,246 5,664
Income effect (5,233) 581
Equity effect 1 1
Deferred tax liability (asset) at end of period 1,014 6,246
Total credit differences    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 42,586 43,641
Income effect 3,347 (2,355)
Equity effect (2,392) 1,300
Deferred tax liability (asset) at end of period 43,541 42,586
Depreciation of property and equipment and investment properties    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 14,281 11,815
Income effect 709 2,466
Deferred tax liability (asset) at end of period 14,990 14,281
Adjustment for valuation and impairment of financial assets at fair value through OCI    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 2,392 1,092
Income effect   1
Equity effect (2,392) 1,299
Deferred tax liability (asset) at end of period   2,392
Transitory assets    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 5,486 4,772
Income effect 28 714
Deferred tax liability (asset) at end of period 5,514 5,486
Derivative instruments adjustments    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 4,378 7,707
Income effect (4,378) (3,329)
Deferred tax liability (asset) at end of period   4,378
Accrued interest to effective rate    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 1,603 2,247
Income effect (39) (644)
Deferred tax liability (asset) at end of period 1,564 1,603
Advance payment of lump-sum under union contracts    
Effect of deferred taxes on income and equity    
Income effect 6,699  
Deferred tax liability (asset) at end of period 6,699  
Intangible assets amortization    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 5,503 6,090
Income effect   (587)
Deferred tax liability (asset) at end of period 5,503 5,503
Other adjustments    
Effect of deferred taxes on income and equity    
Deferred tax liability (asset) at beginning of period 8,943 9,918
Income effect 328 (976)
Equity effect   1
Deferred tax liability (asset) at end of period $ 9,271 $ 8,943