Supplemental Consolidated Statements of Cash Flows Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash paid during the year for [Abstract]
Interest	$ 1,841	$ 1,266	$ 1,085
Income taxes	4,560	4,105	7,265
Supplemental disclosures of non-cash investing and financing activities [Abstract]
Stock dividend distributed	6,610	6,046	5,295
Fair value adjustment of securities available for sale, net of tax of $2,188, ($349), and $(564) for the years ended December 31, 2019, 2018, and 2017, respectively	5,428	(870)	(846)
Loans held-for-investment transferred to other real estate owned	0	1,092	0
Recognition of right-of-use assets obtained in exchange for operating lease liabilities	7,827	0	0
Fair value adjustment of securities available for sale, tax	$ 2,188	$ (349)	$ (564)