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Industry Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Fee income from customers                 $ 104,076 $ 95,512 $ 86,136
Interest income [1]                 50,348 47,667 45,431
Interest expense $ 1,234 $ 1,029 $ 794 $ 679 $ 666 $ 571 $ 470 $ 480 3,736 2,187 2,029
Intersegment income (expense)                
Depreciation and amortization                 4,396 4,051 3,653
Tax-equivalized pre-tax income 1,502 $ 1,481 $ 1,387 $ 1,709 3,576 [2] $ 2,396 $ 2,248 $ 1,665 6,079 [1] 9,885 [1],[2] 7,716 [1]
Goodwill 12,569       12,569       12,569 12,569 11,590
Other intangible assets, net 1,554       1,996       1,554 1,996 1,997
Total Assets 1,695,176       1,657,209       1,695,176 1,657,209 1,504,839
Funding Sources 1,215,386       1,203,479       1,215,386 1,203,479 1,160,700
Information Services [Member]                      
Segment Reporting Information [Line Items]                      
Fee income from customers                 102,839 93,484 83,821
Interest income [1]                 22,273 20,634 18,729
Interest expense                
Intersegment income (expense)                
Depreciation and amortization                 4,254 3,902 3,488
Tax-equivalized pre-tax income [1]                 24,962 24,990 20,065
Goodwill 12,433       12,433       12,433 12,433 11,454
Other intangible assets, net 1,554       1,996       1,554 1,996 1,997
Total Assets 826,201       854,214       826,201 854,214 763,999
Funding Sources 642,733       604,493       642,733 604,493 545,726
Banking Services [Member]                      
Segment Reporting Information [Line Items]                      
Fee income from customers                 1,307 1,547 1,417
Interest income [1]                 23,706 23,732 24,088
Interest expense                 3,736 2,187 2,029
Intersegment income (expense)                 1,880 1,362 1,136
Depreciation and amortization                 142 149 165
Tax-equivalized pre-tax income [1]                 11,625 13,691 15,090
Goodwill 136       136       136 136 136
Other intangible assets, net            
Total Assets 886,291       830,672       886,291 830,672 756,164
Funding Sources 572,653       598,986       572,653 598,986 614,974
Corporate Eliminations and Other [Member]                      
Segment Reporting Information [Line Items]                      
Fee income from customers                 (70) 481 898
Interest income [1]                 4,369 3,301 2,614
Interest expense                
Intersegment income (expense)                 (1,880) (1,362) (1,136)
Depreciation and amortization                
Tax-equivalized pre-tax income [1]                 2,181 1,908 2,410
Goodwill            
Other intangible assets, net            
Total Assets (17,316)       (27,677)       (17,316) (27,677) (15,324)
Funding Sources            
[1] Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.
[2] Includes one-time, non-cash TCJA charge of $1,824,000