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Industry Segment Information (Details) (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
Fee revenue and other income:                      
Income from customers                 $ 71,138 $ 62,824 $ 56,146
Intersegment income (expense)                 0 0 0
Net interest income (expense) after provision for loan losses:                      
Income from customers                 40,385 43,711 40,071
Intersegment income (expense)                 0 0 0
Depreciation and amortization                 2,532 2,062 2,131
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
Goodwill 11,590       7,471       11,590 7,471 7,471
Other intangible assets, net 3,757       161       3,757 161 268
Total assets 1,287,387       1,319,301       1,287,387 1,319,301 1,188,035
Information Services [Member]
                      
Fee revenue and other income:                      
Income from customers                 70,376 61,470 54,732
Intersegment income (expense)                 9,478 10,088 8,939
Net interest income (expense) after provision for loan losses:                      
Income from customers                 18,547 21,030 19,381
Intersegment income (expense)                 24 17 23
Depreciation and amortization                 2,392 1,874 1,875
Income tax expense                 2,802 3,028 2,955
Net income                 15,761 14,716 13,220
Goodwill 11,454       7,335       11,454 7,335 7,335
Other intangible assets, net 3,757       161       3,757 161 268
Total assets 642,623       698,685       642,623 698,685 612,981
Banking Services [Member]
                      
Fee revenue and other income:                      
Income from customers                 1,272 1,354 1,414
Intersegment income (expense)                 1,663 1,859 1,656
Net interest income (expense) after provision for loan losses:                      
Income from customers                 21,838 22,681 20,690
Intersegment income (expense)                 (24) (17) (23)
Depreciation and amortization                 101 164 242
Income tax expense                 5,085 5,469 4,668
Net income                 8,014 8,293 7,090
Goodwill 136       136       136 136 136
Other intangible assets, net 0       0       0 0 0
Total assets 668,648       622,996       668,648 622,996 580,948
Corporate Eliminations and Other [Member]
                      
Fee revenue and other income:                      
Income from customers                 (510) 0 0
Intersegment income (expense)                 (11,141) (11,947) (10,595)
Net interest income (expense) after provision for loan losses:                      
Income from customers                 0 0 0
Intersegment income (expense)                 0 0 0
Depreciation and amortization                 39 24 14
Income tax expense                 0 0 0
Net income                 (472) 0 0
Goodwill 0       0       0 0 0
Other intangible assets, net 0       0       0 0 0
Total assets $ (23,884)       $ (2,380)       $ (23,884) $ (2,380) $ (5,894)