Condensed Financial Statements of Parent Company, Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets [Abstract]
Cash and cash equivalents	$ 42,217	$ 14,412	$ 25,854
Securities available-for-sale	148,247	157,121
Other assets	13,848	12,777
Total assets	1,038,183	981,826
Liabilities and Stockholders' Equity [Abstract]
Other borrowings	2,550	0
Other liabilities	4,708	3,651
Common stock	25,853	25,087
Additional paid-in capital	20,698	17,270
Retained earnings	57,611	54,738
Accumulated other comprehensive loss	(2,156)	(707)
Total liabilities and stockholders' equity	1,038,183	981,826
Parent Company [Member]
Assets [Abstract]
Cash and cash equivalents	1,352	2,622	$ 2,366
Securities available-for-sale	0	197
Investment in common stock of subsidiaries	103,035	93,533
Other assets	205	54
Total assets	104,592	96,406
Liabilities and Stockholders' Equity [Abstract]
Other borrowings	2,550	0
Other liabilities	36	18
Common stock	25,853	25,087
Additional paid-in capital	20,698	17,270
Retained earnings	57,611	54,738
Accumulated other comprehensive loss	(2,156)	(707)
Total liabilities and stockholders' equity	$ 104,592	$ 96,406