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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

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