Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Expense (Benefit) [Abstract]                              
Expected income tax expense at federal tax rate                         $ 3,392 $ 3,490 $ 3,544
State taxes net of federal benefit                         647 604 577
Nondeductible expenses                         40 39 35
Nontaxable income                         (398) (345) (340)
Other                         (48) (12) (45)
Income tax expense (benefit), total $ 811 $ 735 $ 1,004 $ 1,083 $ 579 $ 1,363 $ 760 $ 1,074 $ 885 $ 987 $ 909 $ 990 $ 3,633 $ 3,776 $ 3,771
Expected income tax expense at federal tax rate                         34.00% 34.00% 34.00%
State taxes net of federal benefit                         6.49% 5.88% 5.54%
Nondeductible expenses                         0.40% 0.38% 0.34%
Nontaxable income                         (3.99%) (3.36%) (3.26%)
Other                         (0.48%) (0.12%) (0.43%)
Total income tax expense                         36.42% 36.78% 36.18%