Investment securities available for sale (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | $ 44,169 | $ 38,584 |
| Gross Unrealized Gains | 1 | 1 |
| Gross Unrealized Losses | (276) | (666) |
| Estimated Fair Value | 43,894 | 37,919 |
| U.S. Government Agencies [Member] | ||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 32,475 | 34,286 |
| Gross Unrealized Gains | 0 | 0 |
| Gross Unrealized Losses | (229) | (573) |
| Estimated Fair Value | 32,246 | 33,713 |
| Mortgage Backed Securities [Member] | ||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 11,694 | 3,043 |
| Gross Unrealized Gains | 1 | 1 |
| Gross Unrealized Losses | (47) | (43) |
| Estimated Fair Value | $ 11,648 | 3,001 |
| Municipals [Member] | ||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 1,255 | |
| Gross Unrealized Gains | 0 | |
| Gross Unrealized Losses | (50) | |
| Estimated Fair Value | $ 1,205 |