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Current Taxes and Deferred Taxes - Effect of deferred taxes on income and equity (Details) - CLP ($) $ in Millions | 12 Months Ended
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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

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