INVESTMENT SECURITIES HELD TO MATURITY - Amortized cost and fair value (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Amortized cost of held-to-maturity securities, by contractual maturity | ||
| Within one year | $ 861 | |
| One to five years | 22,915 | |
| Five to ten years | 42,080 | |
| After ten years | 12,816 | |
| Amortized cost | 78,672 | $ 87,521 |
| Fair Value of held-to-maturity securities, by contractual maturity | ||
| Within one year | 865 | |
| One to five years | 23,537 | |
| Five to ten years | 44,547 | |
| After ten years | 13,003 | |
| Fair value | $ 81,952 | $ 92,816 |