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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.

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