Investment securities available for sale (Details 1) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Schedule of Available-for-sale Securities [Line Items] | ||||
| Gross realized gains | $ 0 | $ 15 | $ 0 | $ 162 |
| Gross realized losses | 0 | 0 | (9) | 0 |
| Available-for-sale Securities, Gross Realized Gain (Loss), Total | $ 0 | $ 15 | $ (9) | $ 162 |