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SUPPLEMENTARY FINANCIAL INFORMATION (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fee revenue and other income $ 17,717 $ 17,301 $ 18,237 $ 17,883 $ 15,762 $ 16,447 $ 15,783 $ 14,832 $ 71,138 $ 62,824 $ 56,146
Interest income 11,419 11,395 11,530 11,589 12,042 12,494 12,795 12,904 45,933 50,235 49,046
Interest expense 765 785 760 838 983 1,060 1,125 1,206 3,148 4,374 4,875
Net interest income 10,654 10,610 10,770 10,751 11,059 11,434 11,670 11,698 42,785 45,861 44,171
Provision for loan losses 1,600 0 600 200 300 550 850 450 2,400 2,150 4,100
Operating expense 19,823 19,929 20,240 20,341 19,347 18,913 18,635 18,134 80,333 75,029 68,284
Income tax expense 1,607 1,890 2,205 2,185 1,683 2,358 2,229 2,227 7,887 8,497 7,623
Net income $ 5,341 $ 6,092 $ 5,962 $ 5,908 $ 5,491 $ 6,060 $ 5,739 $ 5,719 $ 23,303 $ 23,009 $ 20,310
Net income per share:                      
Basic earnings per share $ 0.47 $ 0.53 $ 0.53 $ 0.52 $ 0.48 $ 0.54 $ 0.51 $ 0.50 $ 2.05 $ 2.03 $ 1.8
Diluted earnings per share $ 0.46 $ 0.53 $ 0.52 $ 0.51 $ 0.48 $ 0.53 $ 0.50 $ 0.50 $ 2.02 $ 2.01 $ 1.78