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SECURITIES - Securities Available for Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost $ 299,003   $ 299,003   $ 344,480
Unrealized Gains 4,481   4,481   2,104
Unrealized Losses 225   225   1,764
Estimated Fair Value 303,259   303,259   344,820
Amortized Cost [Abstract]          
Within one year 25,524   25,524    
After one, but within five years 41,911   41,911    
After five, but within ten years 10,675   10,675    
After ten years 174   174    
Total 78,284   78,284    
Total 298,718   298,718    
Fair Value [Abstract]          
Within one year 25,640   25,640    
After one, but within five years 42,675   42,675    
After five, but within ten years 11,033   11,033    
After ten years 170   170    
Total 79,518   79,518    
Total 302,779   302,779    
Proceeds from sales and calls of securities resulting in gains or losses [Abstract]          
Proceeds 20,709 $ 2,936 36,130 $ 58,035  
Gross gains 75 24 983 326  
Gross losses 0 (35) 0 (35)  
Tax expense 28 $ (5) 371 $ 111  
Obligations of U.S. Government and U.S. Government Sponsored Enterprises [Member]          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 38,312   38,312   99,430
Unrealized Gains 399   399   752
Unrealized Losses 0   0   16
Estimated Fair Value 38,711   38,711   100,166
Mortgage-Backed Securities, Residential [Member]          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 219,847   219,847   199,680
Unrealized Gains 3,026   3,026   427
Unrealized Losses 202   202   1,741
Estimated Fair Value 222,671   222,671   198,366
Amortized Cost [Abstract]          
Without Single Maturity Date 219,847   219,847    
Fair Value [Abstract]          
Without Single Maturity Date 222,671   222,671    
Obligations of States and Political Subdivisions [Member]          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 39,724   39,724   43,695
Unrealized Gains 840   840   737
Unrealized Losses 12   12   6
Estimated Fair Value 40,552   40,552   44,426
Corporate Bonds and Notes [Member]          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 248   248   747
Unrealized Gains 7   7   5
Unrealized Losses 0   0   0
Estimated Fair Value 255   255   752
SBA Loans Pools [Member]          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 587   587   643
Unrealized Gains 4   4   5
Unrealized Losses 1   1   1
Estimated Fair Value 590   590   647
Amortized Cost [Abstract]          
Without Single Maturity Date 587   587    
Fair Value [Abstract]          
Without Single Maturity Date 590   590    
Corporate Stocks [Member]          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 285   285   285
Unrealized Gains 205   205   178
Unrealized Losses 10   10   0
Estimated Fair Value $ 480   $ 480   $ 463