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Deposits (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of deposits from customers [Abstract] |
Disclosure Of Detailed Information About Maturity Period Of Bank Deposits [Text Block] | The maturity profile of the Bank’s deposits is as follows:
|  | December 31, 2017 |  | December 31, 2016 |
Demand |  |  | 82,064 |  |  | 127,014 |
Up to 1 month |  |  | 1,147,772 |  |  | 1,201,328 |
From 1 month to 3 months |  |  | 492,205 |  |  | 463,479 |
From 3 months to 6 months |  |  | 411,159 |  |  | 336,627 |
From 6 months to 1 year |  |  | 571,500 |  |  | 436,884 |
From 1 year to 2 years |  |  | 76,422 |  |  | 190,000 |
From 2 years to 5 years |  |  | 147,722 |  |  | 47,520 |
|  |  | 2,928,844 |  |  | 2,802,852 |
Disclosure Of Additional Information Of Bank Deposits [Text Block] | The following table presents additional information regarding the Bank’s deposits:
|  | December 31, 2017 |  | December 31, 2016 |
Aggregate amounts of time deposits of $100,000 or more |  |  | 2,928,425 |  |  | 2,802,474 |
Aggregate amounts of deposits in the New York Agency |  |  | 266,158 |  |  | 250,639 |
|  | December 31, 2017 |  | December 31, 2016 |  | December 31, 2015 |
Interest expense to deposits in the New York Agency |  |  | 3,519 |  |  | 2,094 |  |  | 1,228 |

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