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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.