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Condensed Financial Information of Parent Company (Schedule of Condensed Statement of Income) (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
Income from subsidiaries:                      
Information services revenue                 $ 102,181 $ 93,322 $ 83,713
Net interest income after provision                 44,190 39,790 39,401
(Losses) gains on sales of securities                 (42) 387
Total net revenue                 148,266 135,302 125,537
Expenses:                      
Salaries and employee benefits                 85,881 77,339 72,581
Other expenses                 1,963 1,722 1,913
Total operating expense $ 29,744 $ 28,530 $ 27,463 $ 26,182 $ 26,142 $ 25,042 $ 24,901 $ 24,318 111,919 100,403 93,473
Income tax expense 1,502 1,481 1,387 1,709 3,576 [1] 2,396 2,248 1,665 6,079 [2] 9,885 [1],[2] 7,716 [2]
Net income $ 7,057 $ 7,610 $ 7,509 $ 8,092 $ 5,331 $ 6,863 $ 6,513 $ 6,307 30,268 25,014 24,348
Parent Company [Member]                      
Income from subsidiaries:                      
Interest                 2
Management fees                 2,668 2,172 2,105
Income from subsidiaries                 2,668 2,172 2,107
Information services revenue                 100,628 93,133 83,543
Net interest income after provision                 14,159 13,217 13,389
(Losses) gains on sales of securities                 (42) 387
Other income                 456 483 504
Total net revenue                 117,869 109,005 99,930
Expenses:                      
Salaries and employee benefits                 77,946 70,409 65,968
Other expenses                 23,442 20,333 18,133
Total operating expense                 101,388 90,742 84,101
Income before income tax and equity in undistributed income of subsidiaries                 16,481 18,263 15,829
Income tax expense                 1,788 4,394 1,540
Income before undistributed income of subsidiaries                 14,693 13,869 14,289
Equity in undistributed income of subsidiaries                 15,575 11,145 10,059
Net income                 $ 30,268 $ 25,014 $ 24,348
[1] Includes one-time, non-cash TCJA charge of $1,824,000
[2] 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.