Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Data Abstract
Total interest income	$ 21,084		$ 20,551		$ 20,042		$ 18,850		$ 18,469	$ 18,332	$ 17,950	$ 17,747	$ 80,527	$ 72,498	$ 53,827
Total interest expense	2,017		1,876		1,669		1,319		1,178	1,139	1,061	1,000	6,881	4,378	4,090
NET INTEREST INCOME	19,067		18,675		18,373		17,531		17,291	17,193	16,889	16,747	73,646	68,120	49,737
Provision for loan losses	400		950		950		1,050		990	1,110	990	780
Noninterest income	6,051		6,058		6,055		5,887		6,076	6,485	5,737	4,946	24,051	23,244	18,306
Merger related costs	452		270		104		62		19	31	224	289	888	563	6,392
Noninterest expense	14,947		15,521		15,660		14,551		14,981	15,194	14,559	14,155	61,567	59,452	53,979
INCOME BEFORE INCOME TAXES	9,319		7,992		7,714		7,755		7,377	7,343	6,853	6,469	32,780	28,042	10,554
INCOME TAXES	4,084	[1]	2,009	[1]	2,004	[1]	1,972	[1]	2,014	1,967	1,833	1,671	10,069	7,485	2,499
NET INCOME	$ 5,235		$ 5,983		$ 5,710		$ 5,783		$ 5,363	$ 5,376	$ 5,020	$ 4,798	$ 22,711	$ 20,557	$ 8,055
Earnings per share - basic and diluted	$ 0.19		$ 0.22		$ 0.21		$ 0.21		$ 0.20	$ 0.20	$ 0.19	$ 0.18	$ 0.82	$ 0.76	$ 0.36

[1] Income tax expense for the fourth quarter was elevated due to the additional $1.8 million of tax expense from the re-measurement of the Company’s net deferred tax asset.