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SECURITIES - Securities Available for Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost $ 325,284   $ 325,284   $ 310,401
Unrealized Gains 1,837   1,837   806
Unrealized Losses 2,828   2,828   7,805
Estimated Fair Value 324,293   324,293   303,402
Amortized Cost [Abstract]          
Within one year 9,604   9,604    
After one, but within five years 30,400   30,400    
After five, but within ten years 29,868   29,868    
After ten years 1,372   1,372    
Total 71,244   71,244    
Total 325,019   325,019    
Fair Value [Abstract]          
Within one year 9,696   9,696    
After one, but within five years 30,704   30,704    
After five, but within ten years 30,398   30,398    
After ten years 1,391   1,391    
Total 72,189   72,189    
Total 323,777   323,777    
Proceeds from sales and calls of securities resulting in gains or losses [Abstract]          
Proceeds 540 $ 0 540 $ 15,422  
Gross gains 12 0 12 908  
Tax expense 4 $ 0 4 $ 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 16,245   16,245   17,300
Unrealized Gains 115   115   155
Unrealized Losses 0   0   0
Estimated Fair Value 16,360   16,360   17,455
Mortgage-backed securities, residential          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 249,163   249,163   253,156
Unrealized Gains 617   617   202
Unrealized Losses 2,803   2,803   7,492
Estimated Fair Value 246,977   246,977   245,866
Amortized Cost [Abstract]          
Without single maturity date 249,163   249,163    
Fair Value [Abstract]          
Without single maturity date 246,977   246,977    
Obligations of states and political subdivisions          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 54,751   54,751   38,843
Unrealized Gains 846   846   209
Unrealized Losses 20   20   312
Estimated Fair Value 55,577   55,577   38,740
Corporate bonds and notes          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 248   248   249
Unrealized Gains 4   4   1
Unrealized Losses 0   0   0
Estimated Fair Value 252   252   250
SBA loan pools          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 4,612   4,612   568
Unrealized Gains 4   4   3
Unrealized Losses 5   5   1
Estimated Fair Value 4,611   4,611   570
Amortized Cost [Abstract]          
Without single maturity date 4,612   4,612    
Fair Value [Abstract]          
Without single maturity date 4,611   4,611    
Corporate stocks          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 265   265   285
Unrealized Gains 251   251   236
Unrealized Losses 0   0   0
Estimated Fair Value $ 516   $ 516   $ 521