Business Combination and Intangible Assets (Proforma Results) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2018	[1]	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	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, 2018	Dec. 31, 2017	Dec. 31, 2016
Total revenue (net interest income plus noninterest income)																	$ 54,955	$ 47,429
Net income																	$ 11,228	$ 7,208	$ 7,331
Basic earnings per common share	$ 0.69		$ 0.70		$ 0.42		$ 0.22		$ (0.10)	$ 0.60	$ 0.55	$ 0.51	$ 0.44	$ 0.43	$ 0.38	$ 0.35	$ 2.02	$ 1.56	$ 1.59
County First Acquisition [Member]
Proforma, Total revenue (net interest income plus noninterest income)																		$ 56,241
Proforma, Net income																		$ 8,134
Proforma, Basic earnings per common share																		$ 1.47
County First Bank [Member]
Total revenue (net interest income plus noninterest income)																		$ 8,812
Net income																		$ 926
Basic earnings per common share																		$ 1.01

[1] Earnings per share are based upon quarterly results and, when added, may not total the annual earnings per share amounts.