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INVESTMENT SECURITIES (Details 3) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Schedule of Available-for-sale Securities    
Gross gains on sale of investment securities $ 3,500,000 $ 5,600,000
Gross losses on sale of investment securities 127,000 0
Net income statement impact of net gain on sale of investment securities 3,400,000 5,600,000
Tax expense on sale of investment securities 1,400,000 2,300,000
Net proceeds for sales of investment securities 330,200,000 196,900,000
MetroCorp
   
Schedule of Available-for-sale Securities    
Gross losses on sale of investment securities 127,000  
Net income statement impact of net gain on sale of investment securities $ 41,000