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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income from subsidiaries: |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision |  |  |  |  |  |  |  |  | $ 39,401 | $ 37,449 | $ 37,299
Gain on sales of investment securities |  |  |  |  |  |  |  |  | 387 | 2,910 | 23
Total net revenue |  |  |  |  |  |  |  |  | 125,537 | 120,817 | 117,206
Expenses: |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  | 72,581 | 70,314 | 66,100
Other expenses |  |  |  |  |  |  |  |  | 1,913 | 1,185 | 1,647
Total operating expense | $ 23,946 | $ 23,552 | $ 23,059 | $ 22,916 | $ 22,201 | $ 22,634 | $ 22,640 | $ 22,308 | 93,473 | 89,783 | 85,414
Income tax expense | 1,806 | 1,855 | 2,035 | 2,020 | 2,017 | 2,083 | 1,932 | 1,946 | 7,716 | 7,978 | 7,759
Net income | $ 6,424 | $ 6,222 | $ 5,869 | $ 5,833 | $ 6,089 | $ 5,880 | $ 5,548 | $ 5,539 | 24,348 | 23,056 | 24,033
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Income from subsidiaries: |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 2 | 12 | 12
Management fees |  |  |  |  |  |  |  |  | 2,105 | 2,201 | 2,058
Income from subsidiaries |  |  |  |  |  |  |  |  | 2,107 | 2,213 | 2,070
Information services revenue |  |  |  |  |  |  |  |  | 83,543 | 78,488 | 77,064
Net interest income after provision |  |  |  |  |  |  |  |  | 13,389 | 13,948 | 14,986
Gain on sales of investment securities |  |  |  |  |  |  |  |  | 387 | 2,910 | 23
Other income |  |  |  |  |  |  |  |  | 504 | 613 | 1,323
Total net revenue |  |  |  |  |  |  |  |  | 99,930 | 98,172 | 95,466
Expenses: |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  | 65,968 | 63,475 | 59,885
Other expenses |  |  |  |  |  |  |  |  | 18,133 | 16,580 | 15,587
Total operating expense |  |  |  |  |  |  |  |  | 84,101 | 80,055 | 75,472
Income before income tax and equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 15,829 | 18,117 | 19,994
Income tax expense |  |  |  |  |  |  |  |  | 1,540 | 2,950 | 3,125
Income before undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 14,289 | 15,167 | 16,869
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 10,059 | 7,889 | 7,164
Net income |  |  |  |  |  |  |  |  | $ 24,348 | $ 23,056 | $ 24,033

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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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