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SECURITIES - Investment securities available for sale in continuous unrealized loss position (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 months $ 259,567 $ 195,983
12 months or longer 225 843
Total 259,792 196,826
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 months 7,804 1,761
12 months or longer 1 3
Total 7,805 1,764
Mortgage-backed securities, residential    
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 months 233,843 177,058
12 months or longer 0 0
Total 233,843 177,058
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 months 7,492 1,741
12 months or longer 0 0
Total 7,492 1,741
Obligations of states and political subdivisions    
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 months 25,724 3,756
12 months or longer 0 592
Total 25,724 4,348
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 months 312 4
12 months or longer 0 2
Total 312 6
SBA loan pools    
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 months 0  
12 months or longer 225  
Total 225  
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 months 0  
12 months or longer 1  
Total $ 1  
Obligations of U.S. Government and U.S. Government sponsored enterprises    
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 months   15,169
12 months or longer   0
Total   15,169
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 months   16
12 months or longer   0
Total   16
Corporate stocks    
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 months   0
12 months or longer   251
Total   251
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 months   0
12 months or longer   1
Total   $ 1