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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information services revenue |  |  |  |  |  |  |  |  | $ 107,953 |  | $ 102,181 |  | $ 93,322 |
Net interest income after provision |  |  |  |  |  |  |  |  | 47,166 |  | 44,190 |  | 39,790 |
Gain (loss) on sales of investment securities |  |  |  |  |  |  |  |  | 19 |  | (42) |  |  |
Total net revenue |  |  |  |  |  |  |  |  | 157,235 |  | 148,266 |  | 135,302 |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  | 91,083 |  | 85,881 |  | 77,339 |
Other expenses |  |  |  |  |  |  |  |  | 2,404 |  | 1,963 |  | 1,722 |
Total operating expense | $ 30,773 | $ 30,563 | $ 29,971 | $ 28,462 | $ 29,744 | $ 28,530 | $ 27,463 | $ 26,182 | 119,769 |  | 111,919 |  | 100,403 |
Income tax expense | 1,791 | 1,787 | 1,739 | 1,745 | 1,502 | 1,481 | 1,387 | 1,709 | 7,062 | [1] | 6,079 | [1] | 9,885 | [1]
Net income | $ 6,371 | $ 8,186 | $ 7,684 | $ 8,163 | $ 7,057 | $ 7,610 | $ 7,509 | $ 8,092 | 30,404 |  | 30,268 |  | 25,014 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from subsidiaries - management fees |  |  |  |  |  |  |  |  | 2,599 |  | 2,668 |  | 2,172 |
Information services revenue |  |  |  |  |  |  |  |  | 106,198 |  | 100,628 |  | 93,133 |
Net interest income after provision |  |  |  |  |  |  |  |  | 15,713 |  | 14,159 |  | 13,217 |
Gain (loss) on sales of investment securities |  |  |  |  |  |  |  |  | 19 |  | (42) |  |  |
Other income |  |  |  |  |  |  |  |  | 518 |  | 456 |  | 483 |
Total net revenue |  |  |  |  |  |  |  |  | 125,047 |  | 117,869 |  | 109,005 |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  | 81,432 |  | 77,946 |  | 70,409 |
Other expenses |  |  |  |  |  |  |  |  | 26,136 |  | 23,442 |  | 20,333 |
Total operating expense |  |  |  |  |  |  |  |  | 107,568 |  | 101,388 |  | 90,742 |
Income before income tax and equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 17,479 |  | 16,481 |  | 18,263 |
Income tax expense |  |  |  |  |  |  |  |  | 2,860 |  | 1,788 |  | 4,394 |
Income before undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 14,619 |  | 14,693 |  | 13,869 |
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 15,785 |  | 15,575 |  | 11,145 |
Net income |  |  |  |  |  |  |  |  | $ 30,404 |  | $ 30,268 |  | $ 25,014 |
[1] | Presented on a tax-equivalent basis assuming a tax rate of 21% for 2019 and 2018 and 35% for 2017. The tax-equivalent adjustment was approximately $2,084,000 for 2019, $2,422,000 for 2018, and $5,691,000 for 2017.

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