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INVESTMENT SECURITIES - Summary of unrealized loss positions (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
position
Dec. 31, 2014
USD ($)
position
Dec. 31, 2013
USD ($)
Investments in an unrealized loss position      
Total temporary impairment $ 813    
Fair Value, AFS and HTM      
Less than 12 months, Fair Value 55,314 $ 2,202  
12 months or more, Fair Value 17,421 58,213  
Unrealized Loss, AFS and HTM      
Less than 12 months, Unrealized Loss (457) (9)  
12 months or more, Unrealized Loss (356) (1,142)  
Available-for-sale Securities      
Sales of investment securities available-for-sale 12,912 61,299 $ 15,237
Gains on the sale of investments available-for-sale 125 553 145
Losses on the sale of investments available-for-sale 0 140 0
Held-to-maturity Securities [Abstract]      
Proceeds from sale of held to maturity securities 421 0 0
Gain on sale of securities $ 130 $ 413 $ 145
U.S. Agency securities      
Description and number of positions      
Number of investments in an unrealized loss position, AFS | position 9 9  
Fair Value, AFS      
Less than 12 months, Fair Value $ 28,351 $ 996  
12 months or more, Fair Value   26,900  
Unrealized Loss, AFS      
Less than 12 months, Unrealized Loss $ (181) (3)  
12 months or more, Unrealized Loss   $ (462)  
U.S. Sponsored Mortgage backed securities      
Description and number of positions      
Number of investments in an unrealized loss position, AFS | position 19 8  
Fair Value, AFS      
Less than 12 months, Fair Value $ 20,647 $ 678  
12 months or more, Fair Value 11,862 14,824  
Unrealized Loss, AFS      
Less than 12 months, Unrealized Loss (233) (3)  
12 months or more, Unrealized Loss $ (300) $ (416)  
Municipal notes      
Description and number of positions      
Number of investments in an unrealized loss position, HTM | position 22 42  
Fair Value, HTM      
Less than 12 months, Fair Value $ 3,827 $ 528  
12 months or more, Fair Value 5,559 16,489  
Unrealized Loss, HTM      
Less than 12 months, Unrealized Loss (32) (3)  
12 months or more, Unrealized Loss $ (56) $ (264)  
Equity and other securities      
Description and number of positions      
Number of investments in an unrealized loss position, HTM | position 1    
Fair Value, AFS      
Less than 12 months, Fair Value $ 2,489    
Unrealized Loss, AFS      
Less than 12 months, Unrealized Loss $ (11)