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Deposits (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of deposits from customers [Line Items] |  |
Deposits from customers | $ 2,928,844 | $ 2,802,852
Demand [Member] |  |
Disclosure of deposits from customers [Line Items] |  |
Deposits from customers | 82,064 | 127,014
Up to 1 month [Member] |  |
Disclosure of deposits from customers [Line Items] |  |
Deposits from customers | 1,147,772 | 1,201,328
From 1 year to 2 years [member] |  |
Disclosure of deposits from customers [Line Items] |  |
Deposits from customers | 76,422 | 190,000
From 2 years to 5 years [member] |  |
Disclosure of deposits from customers [Line Items] |  |
Deposits from customers | 147,722 | 47,520
From 1 month to 3 months [member] |  |
Disclosure of deposits from customers [Line Items] |  |
Deposits from customers | 492,205 | 463,479
From 3 month to 6 months [member] |  |
Disclosure of deposits from customers [Line Items] |  |
Deposits from customers | 411,159 | 336,627
From 6 month to 1 year |  |
Disclosure of deposits from customers [Line Items] |  |
Deposits from customers | $ 571,500 | $ 436,884

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