Parent Company Only (Schedule of Condensed Cash Flow Statement) (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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income	$ 2,714	$ 3,058	$ 3,002	$ 2,802	$ 2,847	$ 2,863	$ 2,768	$ 2,528	$ 2,327	$ 2,226	$ 2,183	$ 1,980	$ 11,576	$ 11,006	$ 8,716
Stock-based compensation expense													817	749	550
Deferred income tax expense													341	1,019	(666)
Gain on sale of investment securities														(44)
Net cash provided by operating activities													25,786	13,650	13,887
Proceeds from sales of investment securities													10,952	13,514	5,970
Net cash used in investing activities													(33,996)	(117,119)	(69,842)
Exercise of stock options														14	416
Withholdings to purchase capital stock													175	149	126
Cash paid in lieu of fractional shares															(11)
Net cash provided by financing activities													6,388	105,129	45,937
Net (decrease) increase in cash and cash equivalents													(1,822)	1,660	(10,018)
Cash and cash equivalents, beginning				17,485				15,825				25,843	17,485	15,825	25,843
Cash and cash equivalents, ending	15,663				17,485				15,825				15,663	17,485	15,825
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income													11,576	11,006	8,716
Equity in earnings of subsidiary													(12,876)	(11,996)	(9,258)
Stock-based compensation expense													817	749	550
Deferred income tax expense													2	(60)	(69)
Gain on sale of investment securities														(44)
Changes in other assets and liabilities, net													137	12	(26)
Net cash provided by operating activities													(344)	(333)	(87)
Dividends received from subsidiary													4,037	2,723	2,574
Proceeds from sales of investment securities														871
Net cash used in investing activities													4,037	3,594	2,574
Dividends paid, net of dividends reinvested													(4,037)	(3,397)	(2,954)
Exercise of stock options														14	416
Withholdings to purchase capital stock													175	149	126
Cash paid in lieu of fractional shares															(11)
Net cash provided by financing activities													(3,862)	(3,234)	(2,423)
Net (decrease) increase in cash and cash equivalents													(169)	27	64
Cash and cash equivalents, beginning				$ 232				$ 205				$ 141	232	205	141
Cash and cash equivalents, ending	$ 63				$ 232				$ 205				$ 63	$ 232	$ 205