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Condensed Parent Company 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
OPERATING INCOME                      
Interest on interest-bearing deposits                 $ 4,201 $ 3,537 $ 2,462
Other                 7,504 7,430 6,536
OPERATING EXPENSE                      
Other                 32,832 30,479 27,246
Income before taxes                 79,004 70,697 65,646
Allocated income tax benefit                 27,104 25,076 23,337
Amortization of stock-based compensation arrangements of subsidiaries                 (1,530) (3,075) (1,218)
Net income 12,306 13,860 11,729 14,005 11,598 12,553 10,115 11,355 51,900 45,621 42,309
Parent Company [Member]
                      
OPERATING INCOME                      
Dividends from subsidiaries                 20,784 19,011 17,762
Interest on interest-bearing deposits                 57 20 153
Other                   88 (190)
Total Operating Income                 20,841 19,119 17,725
OPERATING EXPENSE                      
Interest                 2,134 2,501 2,016
Other                 942 740 299
Total operating expense                 3,076 3,241 2,315
Income before taxes                 17,765 15,878 15,410
Allocated income tax benefit                 1,371 886 689
Income before equity in undistributed earnings of subsidiaries                 19,136 16,764 16,099
Equity in undistributed earnings of subsidiaries                 34,281 31,856 27,428
Amortization of stock-based compensation arrangements of subsidiaries                 (1,517) (2,999) (1,218)
Net income                 $ 51,900 $ 45,621 $ 42,309