Unaudited Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2020	$ 90	$ 93,162	$ 14,067	$ 0
Balance (in shares) at Dec. 31, 2020	9,044,765
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			11,209		$ 11,209
Exercise of employee stock options (in shares)	0
Shares issued for stock options	$ 0
Shares issued for restricted stock units (in shares)	5,841
Shares issued for restricted stock units	$ 0
Stock-based compensation expense		473
Cash dividends declared			(1,990)
Net change due to unrealized loss				0	0
Balance at Jun. 30, 2021	$ 90	93,635	23,286	0	117,011
Balance (in shares) at Jun. 30, 2021	9,050,606
Balance at Mar. 31, 2021	$ 90	93,464	18,176	0
Balance (in shares) at Mar. 31, 2021	9,049,256
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			6,105		6,105
Exercise of employee stock options (in shares)	0
Shares issued for stock options	$ 0
Shares issued for restricted stock units (in shares)	1,350
Shares issued for restricted stock units	$ 0
Stock-based compensation expense		171
Cash dividends declared			(995)
Net change due to unrealized loss				0	0
Balance at Jun. 30, 2021	$ 90	93,635	23,286	0	117,011
Balance (in shares) at Jun. 30, 2021	9,050,606
Balance at Dec. 31, 2021	$ 91	94,024	33,149	144	127,408
Balance (in shares) at Dec. 31, 2021	9,071,417
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			13,208		13,208
Exercise of employee stock options (in shares)	14,812
Shares issued for stock options	$ 0
Shares issued for restricted stock units (in shares)	12,426
Shares issued for restricted stock units	$ 0
Stock-based compensation expense		992
Cash dividends declared			(2,183)
Net change due to unrealized loss				(7,927)	(8,017)
Balance at Jun. 30, 2022	$ 91	95,016	44,174	(7,783)	131,498
Balance (in shares) at Jun. 30, 2022	9,098,655
Balance at Mar. 31, 2022	$ 91	94,310	38,242	(3,995)
Balance (in shares) at Mar. 31, 2022	9,094,468
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			7,024		7,024
Exercise of employee stock options (in shares)	4,187
Shares issued for stock options	$ 0
Shares issued for restricted stock units (in shares)	0
Shares issued for restricted stock units	$ 0
Stock-based compensation expense		706
Cash dividends declared			(1,092)
Net change due to unrealized loss				(3,788)	(3,778)
Balance at Jun. 30, 2022	$ 91	$ 95,016	$ 44,174	$ (7,783)	$ 131,498
Balance (in shares) at Jun. 30, 2022	9,098,655