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Financial Assets Available-for-sale (Details) $ in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CLP ($) | Dec. 31, 2016 CLP ($) | Dec. 31, 2015 CLP ($) | Dec. 31, 2017 CLP ($)
Financial Assets Available-for-sale |  |  |  |  |
Assets | $ 2,480,079 |  | $ 374,470 |  | $ 1,526,315
Net gain (loss) on available for sale before income tax | $ 7,759 | $ 4,775 | (52,345) | $ 7,243 |
Net of tax amount |  | 3,476 | (39,770) | 4,886 |
Financial assets available-for-sale |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | 374,470 |  | 1,526,315
Net unrealized gain recorded in other comprehensive income for available for sale securities |  | 9,520 | 6,045 | 45,815 |
Net gain (loss) on available for sale before income tax |  | 4,775 | (52,345) | 7,243 |
Tax (expense) benefit |  | (1,299) | 12,575 | (2,357) |
Net of tax amount |  | 3,476 | (39,770) | 4,886 |
Realized gains reclassified to the income statement |  | 5,149 | 64,011 | $ 8,407 |
Financial assets available-for-sale | Instruments issued by the Chilean Government and Central Bank | Comder Contraparte Central S.A |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Amount of other financial instruments considered as collateral guarantee by executing derivative contracts |  | $ 31,415 | 2,099 |  |
Financial assets available-for-sale | Bonds issued by the Chilean Government and Central Bank | Instruments issued by the Chilean Government and Central Bank |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | 20,944 |  | 204,128
Financial assets available-for-sale | Promissory notes issued by the Chilean Government and Central Bank | Instruments issued by the Chilean Government and Central Bank |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  |  |  | 3,346
Financial assets available-for-sale | Other instruments | Instruments issued by the Chilean Government and Central Bank |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | 38,256 |  | 148,894
Financial assets available-for-sale | Other instruments | Other instruments issued in Chile |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | 138,322 |  | 83,006
Financial assets available-for-sale | Other instruments with repurchase agreements | Instruments issued by the Chilean Government and Central Bank |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | $ 4,975 |  | 5,177
Repurchase agreement expiration period | 3 days | 3 days | 7 days |  |
Financial assets available-for-sale | Equity instruments valued at cost | Instruments issued by foreign institutions |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | $ 54 |  | 50
Financial assets available-for-sale | Equity instruments valued at fair value | Other instruments issued in Chile |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | 5,258 |  | 9,218
Financial assets available-for-sale | Equity instruments valued at fair value | Instruments issued by foreign institutions |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | 1,173 |  | 984
Financial assets available-for-sale | Mortgage bonds from domestic banks | Other instruments issued in Chile |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | 108,933 |  | 99,572
Financial assets available-for-sale | Bonds from domestic banks | Other instruments issued in Chile |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | 7,973 |  | 5,415
Financial assets available-for-sale | Deposits from domestic banks | Other instruments issued in Chile |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | 24,032 |  | 956,733
Financial assets available-for-sale | Bonds from other Chilean companies | Other instruments issued in Chile |  |  |  |  |
Financial Assets Available-for-sale |  |  |  |  |
Assets |  |  | $ 29,525 |  | $ 14,969

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