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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income from subsidiaries: |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision |  |  |  |  |  |  |  |  |  | $ 39,790 |  | $ 39,401 | $ 37,449
Gain on sales of investment securities |  |  |  |  |  |  |  |  |  |  |  | 387 | 2,910
Total net revenue |  |  |  |  |  |  |  |  |  | 135,302 |  | 125,537 | 120,817
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  |  | 77,339 |  | 72,581 | 70,314
Other expenses |  |  |  |  |  |  |  |  |  | 1,722 |  | 1,913 | 1,185
Total operating expense | $ 26,142 |  | $ 25,042 | $ 24,901 | $ 24,318 | $ 23,946 | $ 23,552 | $ 23,059 | $ 22,916 | 100,403 |  | 93,473 | 89,783
Income tax expense | 3,576 | [1] | 2,396 | 2,248 | 1,665 | 1,806 | 1,855 | 2,035 | 2,020 | 9,885 | [1] | 7,716 | 7,978
Net income | $ 5,331 |  | $ 6,863 | $ 6,513 | $ 6,307 | $ 6,424 | $ 6,222 | $ 5,869 | $ 5,833 | 25,014 |  | 24,348 | 23,056
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income from subsidiaries: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  |  |  |  | 2 | 12
Management fees |  |  |  |  |  |  |  |  |  | 2,172 |  | 2,105 | 2,201
Income from subsidiaries |  |  |  |  |  |  |  |  |  | 2,172 |  | 2,107 | 2,213
Information services revenue |  |  |  |  |  |  |  |  |  | 93,133 |  | 83,543 | 78,488
Net interest income after provision |  |  |  |  |  |  |  |  |  | 13,217 |  | 13,389 | 13,948
Gain on sales of investment securities |  |  |  |  |  |  |  |  |  |  |  | 387 | 2,910
Other income |  |  |  |  |  |  |  |  |  | 483 |  | 504 | 613
Total net revenue |  |  |  |  |  |  |  |  |  | 109,005 |  | 99,930 | 98,172
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  |  | 70,409 |  | 65,968 | 63,475
Other expenses |  |  |  |  |  |  |  |  |  | 20,333 |  | 18,133 | 16,580
Total operating expense |  |  |  |  |  |  |  |  |  | 90,742 |  | 84,101 | 80,055
Income before income tax and equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  | 18,263 |  | 15,829 | 18,117
Income tax expense |  |  |  |  |  |  |  |  |  | 4,394 |  | 1,540 | 2,950
Income before undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  | 13,869 |  | 14,289 | 15,167
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  | 11,145 |  | 10,059 | 7,889
Net income |  |  |  |  |  |  |  |  |  | $ 25,014 |  | $ 24,348 | $ 23,056
[1] | Includes one-time, non-cash TCJA charge of $1,824,000

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