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PARENT COMPANY CONDENSED FINANCIAL STATEMENTS: (Details 1) (USD $)
In Thousands, 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
Income before income taxes and equity in undistributed earnings of subsidiaries                 $ 46,630 $ 51,592 $ 40,011
Income tax benefit                 (13,818) (14,397) (11,967)
Net income 8,573 8,091 8,705 7,443 10,161 9,814 8,417 8,803 32,812 37,195 28,044
Parent [Member]
                      
Dividends from subsidiaries                 16,347 11,400 16,400
Other income                 1,149 643 1,279
Interest on borrowings                 (225) 0 (70)
Other operating expenses                 (3,383) (3,616) (4,314)
Income before income taxes and equity in undistributed earnings of subsidiaries                 13,888 8,427 13,295
Income tax benefit                 1,267 2,311 1,248
Income before equity in undistributed earnings of subsidiaries                 15,155 10,738 14,543
Equity in undistributed earnings of subsidiaries                 17,657 26,457 13,501
Net income                 $ 32,812 $ 37,195 $ 28,044