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Condensed Financial Information - Parent Company Only (Schedule of Condensed Income Statement) (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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest and Dividend Income, Operating [Abstract]                              
Interest and fees on loans                         $ 24,821 $ 23,037 $ 21,751
Gain on redemption of trust preferred capital notes                         0 0 2,424
Interest Expense [Abstract]                              
Interest expense on borrowings                         57 136 336
Income Tax (Benefit) Expense                         3,626 2,553 2,433
Net income $ 1,710 $ 2,007 $ 2,027 $ 2,042 $ 1,805 $ 1,430 $ 1,610 $ 1,525 $ 1,355 $ 3,289 $ 798 $ 1,455 7,786 6,370 6,897
Comprehensive income                         8,069 5,295 6,633
Parent Company [Member]                              
Interest and Dividend Income, Operating [Abstract]                              
Dividends from subsidiary bank                         3,800 4,350 6,576
Interest and fees on loans                         106 97 52
Other interest and dividends                         0 2 11
Gain on redemption of trust preferred capital notes                         0 0 2,424
Other income (loss)                         0 149 (121)
Total income                         3,906 4,598 8,942
Interest Expense [Abstract]                              
Interest expense on borrowings                         0 143 260
Other operating expenses                         255 211 260
Total expenses                         255 354 520
Income before income tax (benefit) expense and equity (deficit) in undistributed earnings of subsidiary bank                         3,651 4,244 8,422
Income Tax (Benefit) Expense                         (58) (36) 629
Income before equity (deficit) in undistributed earnings of subsidiary bank                         3,709 4,280 7,793
Equity (Deficit) in Undistributed Net Income of Subsidiary Bank                         4,077 2,090 (896)
Net income                         7,786 6,370 6,897
Comprehensive income                         $ 8,069 $ 5,295 $ 6,633