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Industry Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fee revenue and other income:          
Fee income from customers $ 26,435 $ 24,207 $ 77,449 $ 70,778  
Interest income [1] 12,778 12,084 36,891 35,286  
Interest expense 1,029 571 2,502 1,521  
Intersegment income (expense)  
Tax-equivalized pre-tax income [1] 9,654 10,678 29,663 30,282  
Goodwill 12,569 12,569 12,569 12,569 $ 12,569
Other intangible assets, net 1,664 2,106 1,664 2,106  
Total assets 1,678,247 1,556,750 1,678,247 1,556,750 $ 1,657,209
Funding Sources 1,200,861 1,232,894 1,203,898 1,190,628  
Information Services [Member]          
Fee revenue and other income:          
Fee income from customers 26,263 23,809 76,397 69,453  
Interest income [1] 5,703 5,465 16,553 15,237  
Interest expense  
Intersegment income (expense)  
Tax-equivalized pre-tax income [1] 6,525 7,130 19,326 18,946  
Goodwill 12,433 12,433 12,433 12,433  
Other intangible assets, net 1,664 2,106 1,664 2,106  
Total assets 903,055 820,596 903,055 820,596  
Funding Sources 650,267 631,539 637,508 596,919  
Banking Services [Member]          
Fee revenue and other income:          
Fee income from customers 253 279 947 958  
Interest income [1] 5,856 5,894 17,342 17,602  
Interest expense 1,029 571 2,502 1,521  
Intersegment income (expense) 467 339 1,415 962  
Tax-equivalized pre-tax income [1] 2,538 3,179 8,814 9,922  
Goodwill 136 136 136 136  
Other intangible assets, net  
Total assets 847,673 738,478 847,673 738,478  
Funding Sources 550,594 601,355 566,390 593,709  
Corporate Eliminations and Other [Member]          
Fee revenue and other income:          
Fee income from customers (81) 119 105 367  
Interest income [1] 1,219 725 2,996 2,447  
Interest expense  
Intersegment income (expense) (467) (339) (1,415) (962)  
Tax-equivalized pre-tax income [1] 591 369 1,523 1,414  
Goodwill  
Other intangible assets, net  
Total assets (72,481) (2,324) (72,481) (2,324)  
Funding Sources  
[1] Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017. The tax-equivalent adjustment was approximately $564,000 and $1,419,000 for the Three Months Ended 2018 and 2017, respectively, and $1,875,000 and $4,290,000 for the Nine Months Ended 2018 and 2017, respectively.