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SUPPLEMENTARY FINANCIAL INFORMATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SUPPLEMENTARY FINANCIAL INFORMATION [Abstract]                      
Noninterest Income $ 20,184 $ 21,514 $ 20,838 $ 20,832 $ 20,157 $ 20,223 $ 19,952 $ 19,575 $ 83,368 $ 79,907 $ 76,572
Interest income 9,774 9,581 9,803 9,552 10,021 9,991 9,975 9,772 38,710 39,759 41,577
Interest expense 501 498 521 591 603 604 628 625 2,111 2,460 2,832
Net interest income 9,273 $ 9,083 $ 9,282 $ 8,961 $ 9,418 $ 9,387 $ 9,347 $ 9,147 36,599 $ 37,299 38,745
Provision for loan losses (850) (850) 500
Operating expense 22,201 $ 22,634 $ 22,640 $ 22,308 $ 21,887 $ 21,196 $ 21,306 $ 21,025 89,783 $ 85,414 84,086
Income tax expense 2,017 2,083 1,932 1,946 1,902 2,013 1,958 1,886 7,978 7,759 7,234
Net income $ 6,089 $ 5,880 $ 5,548 $ 5,539 $ 5,786 $ 6,401 $ 6,035 $ 5,811 $ 23,056 $ 24,033 $ 23,497
Net income per share:                      
Basic earnings per share $ 0.54 $ 0.52 $ 0.49 $ 0.48 $ 0.50 $ 0.56 $ 0.52 $ 0.51 $ 2.03 $ 2.09 $ 2.05
Diluted earnings per share $ 0.53 $ 0.51 $ 0.48 $ 0.48 $ 0.49 $ 0.55 $ 0.52 $ 0.50 $ 2.00 $ 2.06 $ 2.02