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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	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, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Data Abstract
Total interest income	$ 24,447	$ 23,563	$ 22,474	$ 21,282	$ 21,084	$ 20,551	$ 20,042	$ 18,850	$ 91,766	$ 80,527	$ 72,498
Total interest expense	4,373	3,644	2,912	2,336	2,017	1,876	1,669	1,319	13,265	6,881	4,378
NET INTEREST INCOME	20,074	19,919	19,562	18,946	19,067	18,675	18,373	17,531	78,501	73,646	68,120
Provision for loan losses	525	950	750	775	400	950	950	1,050	3,000	3,350	3,870
Noninterest income	6,705	6,478	6,306	6,010	6,051	6,058	6,055	5,887	25,499	24,051	23,244
Merger related costs	(180)	0	0	25	452	270	104	62	(155)	888	563
Noninterest expense	16,163	16,180	15,458	15,071	14,852	15,425	15,565	14,456	62,717	61,186	59,452
INCOME BEFORE INCOME TAXES	10,271	9,267	9,660	9,085	9,414	8,088	7,809	7,850	38,283	33,161	28,042
INCOME TAXES	1,585	1,183	1,587	1,359	4,179	2,105	2,099	2,067	5,714	10,450	7,485
NET INCOME	$ 8,686	$ 8,084	$ 8,073	$ 7,726	$ 5,235	$ 5,983	$ 5,710	$ 5,783	$ 32,569	$ 22,711	$ 20,557
Earnings per share - basic and diluted	$ 0.31	$ 0.29	$ 0.29	$ 0.28	$ 0.19	$ 0.22	$ 0.21	$ 0.21

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