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SECURITIES - Securities Available for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Amortized cost and estimated fair value of securities available for sale [Abstract]      
Amortized Cost $ 306,414   $ 310,401
Unrealized Gains 998   806
Unrealized Losses 4,831   7,805
Estimated Fair Value 302,581   303,402
Amortized Cost [Abstract]      
Within one year 8,197    
After one, but within five years 33,091    
After five, but within ten years 17,184    
After ten years 3,078    
Total 61,550    
Total 306,149    
Fair Value [Abstract]      
Within one year 8,224    
After one, but within five years 33,411    
After five, but within ten years 17,168    
After ten years 3,043    
Total 61,846    
Total 302,074    
Proceeds from sales and calls of securities resulting in gains or losses [Abstract]      
Proceeds 0 $ 15,422  
Gross gains 0 908  
Gross losses 0 0  
Tax expense 0 $ 343  
Obligations of U.S. Government and U.S. Government sponsored enterprises      
Amortized cost and estimated fair value of securities available for sale [Abstract]      
Amortized Cost 17,295   17,300
Unrealized Gains 145   155
Unrealized Losses 0   0
Estimated Fair Value 17,440   17,455
Mortgage-backed securities, residential      
Amortized cost and estimated fair value of securities available for sale [Abstract]      
Amortized Cost 244,049   253,156
Unrealized Gains 319   202
Unrealized Losses 4,690   7,492
Estimated Fair Value 239,678   245,866
Amortized Cost [Abstract]      
Without Single Maturity Date 244,049    
Fair Value [Abstract]      
Without Single Maturity Date 239,678    
Obligations of states and political subdivisions      
Amortized cost and estimated fair value of securities available for sale [Abstract]      
Amortized Cost 44,007   38,843
Unrealized Gains 288   209
Unrealized Losses 140   312
Estimated Fair Value 44,155   38,740
Corporate bonds and notes      
Amortized cost and estimated fair value of securities available for sale [Abstract]      
Amortized Cost 248   249
Unrealized Gains 3   1
Unrealized Losses 0   0
Estimated Fair Value 251   250
SBA loan pools      
Amortized cost and estimated fair value of securities available for sale [Abstract]      
Amortized Cost 550   568
Unrealized Gains 1   3
Unrealized Losses 1   1
Estimated Fair Value 550   570
Amortized Cost [Abstract]      
Without Single Maturity Date 550    
Fair Value [Abstract]      
Without Single Maturity Date 550    
Corporate stocks      
Amortized cost and estimated fair value of securities available for sale [Abstract]      
Amortized Cost 265   285
Unrealized Gains 242   236
Unrealized Losses 0   0
Estimated Fair Value $ 507   $ 521