Supplemental Consolidated Statements of Cash Flows Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash paid during the year for [Abstract]
Interest	$ 1,517	$ 1,841	$ 1,266
Income taxes	5,400	4,560	4,105
Supplemental disclosures of non-cash investing and financing activities [Abstract]
Stock dividend distributed	7,016	6,610	6,046
Fair value adjustment of securities available for sale, net of tax of $2,273, $2,188, and $(349) for the years ended December 31, 2020, 2019, and 2018, respectively	5,635	5,428	(870)
Loans held-for-investment transferred to other real estate owned	0	0	1,092
Recognition of right-of-use assets obtained in exchange for operating lease liabilities	221	7,827	0
Fair value adjustment of securities available for sale, tax	$ 2,273	$ 2,188	$ (349)