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Condensed Financial Information of Parent Company (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 from subsidiary: |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision |  |  |  |  |  |  |  |  | $ 40,385 | $ 43,711 | $ 40,071
Gain on sales of investment securities |  |  |  |  |  |  |  |  | 2,635 | 43 | 0
Total income |  |  |  |  |  |  |  |  | 111,523 | 106,535 | 96,217
Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  | 62,563 | 56,573 | 51,368
Other expenses |  |  |  |  |  |  |  |  | 1,080 | 1,849 | 1,987
Total expenses | 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
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Income from subsidiary: |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 24 | 18 | 24
Management fees |  |  |  |  |  |  |  |  | 1,955 | 1,794 | 1,849
Income from subsidiary |  |  |  |  |  |  |  |  | 1,979 | 1,812 | 1,873
Information services revenue |  |  |  |  |  |  |  |  | 66,417 | 60,688 | 54,183
Net interest income after provision |  |  |  |  |  |  |  |  | 17,563 | 19,933 | 18,373
Gain on sales of investment securities |  |  |  |  |  |  |  |  | 3,145 | 43 | 0
Other income |  |  |  |  |  |  |  |  | 535 | 701 | 549
Total income |  |  |  |  |  |  |  |  | 89,639 | 83,177 | 74,978
Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  | 55,981 | 50,296 | 45,598
Other expenses |  |  |  |  |  |  |  |  | 14,492 | 14,462 | 13,205
Total expenses |  |  |  |  |  |  |  |  | 70,473 | 64,758 | 58,803
Income before income tax and equity in undistributed income of subsidiary |  |  |  |  |  |  |  |  | 19,166 | 18,419 | 16,175
Income tax expense |  |  |  |  |  |  |  |  | 2,914 | 3,156 | 2,955
Income before undistributed income of subsidiary |  |  |  |  |  |  |  |  | 16,252 | 15,263 | 13,220
Equity in undistributed income of subsidiary |  |  |  |  |  |  |  |  | 7,523 | 7,746 | 7,090
Intercompany elimination |  |  |  |  |  |  |  |  | (472) | 0 | 0
Net income |  |  |  |  |  |  |  |  | $ 23,303 | $ 23,009 | $ 20,310

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