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AVAILABLE-FOR-SALE INVESTMENT SECURITIES (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Schedule of Available-for-sale Investment Securities |  |  |  |  |
Proceeds from sales |  | $ 292,561 | $ 21,611 | $ 473,062 | $ 351,842
Gross realized gains |  | 5,554 | 671 | 9,958 | 4,216
Gross realized losses | [1] |  |  |  | 127
Related tax expense |  | $ 2,333 | $ 282 | $ 4,182 | 1,717
MetroCorp |  |  |  |  |
Schedule of Available-for-sale Investment Securities |  |  |  |  |
Gross realized losses |  |  |  |  | $ 127
[1] | The gross $127 thousand of losses resulted from the available-for-sale investment securities acquired from MetroCorp which were sold immediately after the acquisition closed.

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