Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Securities available-for-sale, amortized cost	$ 47,762	$ 52,763
Estimated fair value	14,802	16,346
Equity securities, amortized cost	$ 2,394	$ 1,262
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	12,500,000	12,500,000
Common stock, shares issued (in shares)	10,780,000	10,615,000
Common stock, shares outstanding (in shares)	10,780,000	10,615,000