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INVESTMENT SECURITIES - INVESTMENT CATEGORY (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Available for sale    
Less than 12 months Fair Value $ 23,865 $ 214,038
Less than 12 months Unrealized Losses (402) (843)
12 months or more Fair Value 22,176 45,783
12 months or more Unrealized Losses (204) (901)
Total Fair Value 46,041 259,821
Total Unrealized Losses $ (606) $ (1,744)
Number of securities held 173 162
Number of securities held in an unrealized loss position 19 34
Securities available for sale $ 489,905 $ 517,058
Held to maturity    
Less than 12 months Fair Value 74,312 4,998
Less than 12 months Unrealized Losses (76) (2)
12 months or more Fair Value 4,915  
12 months or more Unrealized Losses (85)  
Total Fair Value 79,227 4,998
Total Unrealized Losses (161) (2)
U.S. Treasury securities and U.S. Government agencies    
Available for sale    
Less than 12 months Fair Value   191,584
Less than 12 months Unrealized Losses   (433)
12 months or more Fair Value   9,914
12 months or more Unrealized Losses   (61)
Total Fair Value   201,498
Total Unrealized Losses   (494)
Securities available for sale 287,645 286,479
Mortgage backed securities - residential    
Available for sale    
Less than 12 months Fair Value   5,727
Less than 12 months Unrealized Losses   (95)
12 months or more Fair Value 4,619  
12 months or more Unrealized Losses (30)  
Total Fair Value 4,619 5,727
Total Unrealized Losses (30) (95)
Securities available for sale 80,832 92,268
Collateralized mortgage obligations    
Available for sale    
Less than 12 months Fair Value 20,765 6,831
Less than 12 months Unrealized Losses (64) (212)
12 months or more Fair Value 17,557 35,869
12 months or more Unrealized Losses (174) (840)
Total Fair Value 38,322 42,700
Total Unrealized Losses (238) (1,052)
Securities available for sale 95,595 113,668
Held to maturity    
Less than 12 months Fair Value 74,312  
Less than 12 months Unrealized Losses (76)  
Total Fair Value 74,312  
Total Unrealized Losses (76)  
Community Reinvestment Act mutual fund    
Available for sale    
Securities available for sale 2,544 1,011
Corporate bonds    
Available for sale    
Less than 12 months Fair Value   9,896
Less than 12 months Unrealized Losses   (103)
Total Fair Value   9,896
Total Unrealized Losses   (103)
Securities available for sale 15,128 14,922
Held to maturity    
Less than 12 months Fair Value   4,998
Less than 12 months Unrealized Losses   (2)
12 months or more Fair Value 4,915  
12 months or more Unrealized Losses (85)  
Total Fair Value 4,915 4,998
Total Unrealized Losses (85) (2)
Trust preferred security    
Available for sale    
Less than 12 months Fair Value 3,100  
Less than 12 months Unrealized Losses (338)  
Total Fair Value 3,100  
Total Unrealized Losses (338)  
Securities available for sale $ 3,100 3,405
Private label mortgage backed security    
Available for sale    
Number of securities held 1  
Estimated average life 4 years  
Securities available for sale $ 4,868 $ 5,132