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SECURITIES (Detail Textuals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other-Than-Temporary-Impairment      
Proceeds from sales of securities available for sale $ 75,750 $ 360,963 $ 129,431
Gross gains realized on sale of securities available for sale 500 1,200 1,500
Gross losses realized on sale of securities available for sale 500 2,300 $ 800
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings $ 611,000 $ 451,100  
Threshold for Disclosure Percentage 10.00% 10.00%  
Concentration Risk, Percentage   13.00%  
Percentage of Assets Backed by A U S Government Guarantee where Bank Had Invested Holdings that Exceeded Ten Percent of Stockholders Equity   95.00%