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Parent Company Financial Information (Details 1) - 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
Expenses                      
Interest expense $ 1,108 $ 1,075 $ 1,003 $ 908 $ 865 $ 828 $ 790 $ 715 $ 4,094 $ 3,198 $ 2,584
Income tax benefit (592) 1,117 1,102 933 1,099 1,209 1,058 751 2,560 4,117 3,404
Equity in undistributed income of subsidiaries                      
Net income 4,032 2,723 2,317 1,993 2,317 2,547 2,265 1,655 11,065 8,784 7,619
Preferred stock dividends 244 244 244 244 244 244 244 244 975 975 956
Net income available to common shareholders $ 3,788 $ 2,479 $ 2,073 $ 1,749 $ 2,073 $ 2,303 $ 2,021 $ 1,411 10,090 7,809 6,663
Comprehensive income                 10,896 8,185 7,351
Parent [Member]                      
Dividends from subsidiaries:                      
Banking subsidiaries                 2,000 1,000
Nonbanking subsidiaries                 40
Total income                 2,040 1,000
Expenses                      
Interest expense                 304 253 212
Other expense                 1,352 969 922
Total expenses                 1,656 1,222 1,134
Income before income tax                 384 (1,222) (134)
Income tax benefit                 (543) (416) (385)
Income before equity in undistributed income of subsidiaries                 927 (806) 251
Equity in undistributed income of subsidiaries                      
Banking subsidiaries                 10,337 9,662 7,369
Nonbanking subsidiaries                 (199) (72) (1)
Total                 10,138 9,590 7,368
Net income                 11,065 8,784 7,619
Preferred stock dividends                 975 975 956
Net income available to common shareholders                 10,090 7,809 6,663
Comprehensive income                 $ 10,896 $ 8,185 $ 7,351