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Fair Value of Financial Assets and Liabilities-Level 3 Reconciliation (Details) $ in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CLP ($) | Dec. 31, 2016 CLP ($)
Level 3 Reconciliation |  |  |
Assets at beginning of period |  | $ 31,357,304 | $ 31,057,596
Assets at end of period | $ 52,908,434 | 32,561,437 | 31,357,304
Level 3 |  |  |
Level 3 Reconciliation |  |  |
Assets at beginning of period |  | 85,019 | 114,153
Gain (Loss) Recognized in Income |  | (4,197) | (5,843)
Gain (Loss) Recognized in Equity |  | 1,137 | 818
Purchases |  | 12,368 | 28,216
Sales |  | (39,376) | (49,786)
Transfer from Level 1 and 2 |  | 5,057 | 165
Transfer to Level 1 and 2 |  | (5,681) | (2,704)
Assets at end of period |  | 54,327 | 85,019
Level 3 | Financial assets held-for-trading |  |  |
Level 3 Reconciliation |  |  |
Assets at beginning of period |  | 8,960 | 18,028
Gain (Loss) Recognized in Income |  | (7) | 28
Purchases |  | 7,446 | 8,946
Sales |  | (10,772) | (18,042)
Transfer from Level 1 and 2 |  | 2,385 |
Assets at end of period |  | 8,012 | 8,960
Level 3 | Financial assets held-for-trading | Other instruments issued in Chile |  |  |
Level 3 Reconciliation |  |  |
Assets at beginning of period |  | 8,960 | 18,028
Gain (Loss) Recognized in Income |  | (7) | 28
Purchases |  | 7,446 | 8,946
Sales |  | (10,772) | (18,042)
Transfer from Level 1 and 2 |  | 2,385 |
Assets at end of period |  | 8,012 | 8,960
Level 3 | Financial assets available-for-sale |  |  |
Level 3 Reconciliation |  |  |
Assets at beginning of period |  | 76,059 | 96,125
Gain (Loss) Recognized in Income |  | (4,190) | (5,871)
Gain (Loss) Recognized in Equity |  | 1,137 | 818
Purchases |  | 4,922 | 19,270
Sales |  | (28,604) | (31,744)
Transfer from Level 1 and 2 |  | 2,672 | 165
Transfer to Level 1 and 2 |  | (5,681) | (2,704)
Assets at end of period |  | 46,315 | 76,059
Level 3 | Financial assets available-for-sale | Other instruments issued in Chile |  |  |
Level 3 Reconciliation |  |  |
Assets at beginning of period |  | 76,005 | 96,125
Gain (Loss) Recognized in Income |  | (4,186) | (5,871)
Gain (Loss) Recognized in Equity |  | 1,137 | 818
Purchases |  | 4,922 | 19,270
Sales |  | (28,604) | (31,744)
Transfer from Level 1 and 2 |  | 2,672 | 111
Transfer to Level 1 and 2 |  | (5,681) | (2,704)
Assets at end of period |  | 46,265 | 76,005
Level 3 | Financial assets available-for-sale | Instruments issued by foreign institutions |  |  |
Level 3 Reconciliation |  |  |
Assets at beginning of period |  | 54 |
Gain (Loss) Recognized in Income |  | (4) |
Transfer from Level 1 and 2 |  |  | 54
Assets at end of period |  | $ 50 | $ 54

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