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Risk management (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Statement of financial risk management [Line Items] |  |
Deposits from customers | $ 2,928,844 | $ 2,802,852
Deposits From Customers To Total Deposits Percentage | 16.00% | 8.00%
Financial assets held for managing liquidity risk | $ 619 | $ 1,008
Liquid Assets To Total Deposits Percentage | 21.00% | 36.00%
Financial assets held for managing liquidity risk deposited in bank | $ 609,000 | $ 591,000
Financial assets held for managing liquidity risk Percentage deposited in bank | 98.00% | 59.00%
Description of compliance of liquidity guidelines | According to the Bank's liquidity guidelines, it is established that a minimum level of 1.0 of LCR and NSFR must be met. |
Loans and advances to customers | $ 6,369 | $ 19,387
Bottom of range [member] |  |
Statement of financial risk management [Line Items] |  |
Level of liquidity index | 1.25 | 0.94
Top of range [member] |  |
Statement of financial risk management [Line Items] |  |
Level of liquidity index | 1.53 | 2.60
Weighted Average [Member] |  |
Statement of financial risk management [Line Items] |  |
Level of liquidity index | 1.42 | 1.15
Short Term [Member] |  |
Statement of financial risk management [Line Items] |  |
Loans and advances to customers,maruity term | 203 days | 184 days
Loans and advances to customers,remaining maruity term | 112 days | 89 days
Loans and advances to customers | $ 3,746,000 | $ 3,577,000
Medium Term [Member] |  |
Statement of financial risk management [Line Items] |  |
Loans and advances to customers,maruity term | 4 years | 45 months
Loans and advances to customers,remaining maruity term | 655 days | 588 days
Loans and advances to customers | $ 1,872,000 | $ 2,552,000
Investment Securities [Member] | Medium Term [Member] |  |
Statement of financial risk management [Line Items] |  |
Loans and advances to customers | 86,000 | 105,000
Loans Portfolio [Member] | Medium Term [Member] |  |
Statement of financial risk management [Line Items] |  |
Loans and advances to customers | 1,786,000 | 2,447,000
Demand and Call Deposits [Member] |  |
Statement of financial risk management [Line Items] |  |
Deposits from customers | $ 478,000 | $ 227,000

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