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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income from subsidiaries:                      
Net interest income after provision                 $ 37,449 $ 37,299 $ 38,245
Gain on sales of investment securities                 2,910 23 4,024
Total net revenue                 120,817 117,206 114,817
Expenses:                      
Salaries and employee benefits                 70,314 66,100 65,722
Other expenses                 1,185 1,647 1,347
Total operating expense $ 22,201 $ 22,634 $ 22,640 $ 22,308 $ 21,887 $ 21,196 $ 21,306 $ 21,025 89,783 85,414 84,086
Income tax expense 2,017 2,083 1,932 1,946 1,902 2,013 1,958 1,886 7,978 7,759 7,234
Net income $ 6,089 $ 5,880 $ 5,548 $ 5,539 $ 5,786 $ 6,401 $ 6,035 $ 5,811 23,056 24,033 23,497
Parent Company [Member]                      
Income from subsidiaries:                      
Interest                 12 12 12
Management fees                 2,201 2,058 2,119
Income from subsidiaries                 2,213 2,070 2,131
Information services revenue                 78,488 77,064 70,503
Net interest income after provision                 13,948 14,986 15,069
Gain on sales of investment securities                 2,910 23 3,677
Other income                 613 1,323 527
Total net revenue                 98,172 95,466 91,907
Expenses:                      
Salaries and employee benefits                 63,475 59,885 59,004
Other expenses                 16,580 15,587 15,027
Total operating expense                 80,055 75,472 74,031
Income before income tax and equity in undistributed income of subsidiaries                 18,117 19,994 17,876
Income tax expense                 2,950 3,125 2,381
Income before undistributed income of subsidiaries                 15,167 16,869 15,495
Equity in undistributed income of subsidiaries                 $ 7,889 $ 7,164 7,530
Intercompany elimination                 472
Net income                 $ 23,056 $ 24,033 $ 23,497