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AVAILABLE-FOR-SALE INVESTMENT SECURITIES (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Schedule of Available-for-sale Investment Securities |  |  |  |
Proceeds from sales | $ 855,425 | $ 43,788 | $ 1,328,487 | $ 395,630
Gross realized gains | 17,036 | 2,514 | 26,994 | 6,730
Gross realized losses | 0 | 0 | 0 | 127
Related tax expense | $ 7,155 | $ 1,056 | $ 11,337 | 2,773
MetroCorp |  |  |  |
Schedule of Available-for-sale Investment Securities |  |  |  |
Gross realized losses |  |  |  | $ 127

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