INVESTMENT SECURITIES - AMORTIZED COST AND FV (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2008
Securities available for Sale - Amortized Cost        
Due in one year or less $ 96,102,000      
Due from one year to five years 204,327,000      
Due from five years to ten years 10,000,000      
Due beyond ten years 3,449,000      
Total securities 479,825,000      
Securities available for Sale - Fair Value        
Due in one year or less 96,249,000      
Due from one year to five years 203,328,000      
Due from five years to ten years 10,125,000      
Due beyond ten years 3,200,000      
Total securities 481,275,000      
Securities held to maturity - Carrying Value        
Due in one year or less 506,000      
Due from one year to five years 5,075,000      
Due from five years to ten years 19,983,000      
Total securities 52,864,000 $ 38,727,000    
Securities held to maturity - Fair Value        
Due in one year or less 504,000      
Due from one year to five years 5,013,000      
Due from five years to ten years 20,294,000      
Total securities $ 53,249,000 $ 39,196,000    
Number of Securities Held 179 162    
Securities available for sale $ 481,275,000 $ 517,058,000    
Total unrealized gain (2,294,000) (3,160,000) $ 2,021,000  
Private label mortgage backed security        
Securities available for Sale - Amortized Cost        
Securities not due at a single maturity date 3,691,000      
Securities available for Sale - Fair Value        
Securities not due at a single maturity date 4,777,000      
Securities held to maturity - Fair Value        
Securities available for sale 4,777,000 5,132,000    
Mortgage backed securities - residential        
Securities available for Sale - Amortized Cost        
Securities not due at a single maturity date 71,197,000      
Securities available for Sale - Fair Value        
Securities not due at a single maturity date 73,004,000      
Securities held to maturity - Carrying Value        
Securities not due at a single maturity date 158,000      
Total securities 158,000 53,000    
Securities held to maturity - Fair Value        
Securities not due at a single maturity date 170,000      
Total securities 170,000 59,000    
Securities available for sale 73,004,000 92,268,000    
Collateralized mortgage obligations        
Securities available for Sale - Amortized Cost        
Securities not due at a single maturity date 88,559,000      
Securities available for Sale - Fair Value        
Securities not due at a single maturity date 87,654,000      
Securities held to maturity - Carrying Value        
Securities not due at a single maturity date 27,142,000      
Total securities 27,142,000 33,159,000    
Securities held to maturity - Fair Value        
Securities not due at a single maturity date 27,268,000      
Total securities 27,268,000 33,623,000    
Securities available for sale 87,654,000 113,668,000    
Freddie Mac preferred stock        
Securities available for Sale - Fair Value        
Securities not due at a single maturity date 483,000      
Securities held to maturity - Fair Value        
Number of Securities Held       40,000
Other Than Temporary Impairment ("OTTI") charge       $ 2,100,000
Securities available for sale 483,000 173,000   $ 0
Total unrealized gain 483,000      
Community Reinvestment Act mutual fund        
Securities available for Sale - Amortized Cost        
Securities not due at a single maturity date 2,500,000      
Securities available for Sale - Fair Value        
Securities not due at a single maturity date 2,455,000      
Securities held to maturity - Fair Value        
Securities available for sale 2,455,000 1,011,000    
Corporate bonds        
Securities held to maturity - Carrying Value        
Total securities 25,058,000 5,000,000    
Securities held to maturity - Fair Value        
Total securities 25,307,000 4,998,000    
Securities available for sale $ 15,158,000 $ 14,922,000    
Corporate bonds as a percentage of bank's investment portfolio 8.00% 8.00%