CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)	Preferred Stock	Common Stock	Additional paid-in Capital	Retained Earnings	Deferred Comp Plan	Common Stock Issued to Deferred Compensation Trust	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 31, 2018	$ 0	$ 19,312,000	$ 150,718,000	$ 39,640,000	$ (2,615,000)	$ 2,615,000	$ (59,000)	$ 209,611,000
Balance (in shares) at Dec. 31, 2018	0	19,311,505
Net income	$ 0	$ 0	0	3,307,000	0	0	0	3,307,000
Other comprehensive income (loss)	0	0	0	0	0	0	360,000	360,000
Stock option exercises	$ 0	$ 14,000	100,000	0	0	0	0	114,000
Stock option exercises (in shares)	0	14,980
Stock-based compensation	$ 0	$ 0	59,000	0	0	0	0	59,000
Directors' equity incentive plan, net	0	0	0	0	37,000	(37,000)	0	0
Balance at Mar. 31, 2019	$ 0	$ 19,326,000	150,877,000	42,947,000	(2,652,000)	2,652,000	301,000	213,451,000
Balance (in shares) at Mar. 31, 2019	0	19,326,485
Balance at Dec. 31, 2018	$ 0	$ 19,312,000	150,718,000	39,640,000	(2,615,000)	2,615,000	(59,000)	209,611,000
Balance (in shares) at Dec. 31, 2018	0	19,311,505
Net income								6,755,000
Balance at Jun. 30, 2019	$ 0	$ 19,262,000	150,275,000	46,395,000	(2,652,000)	2,652,000	913,000	216,845,000
Balance (in shares) at Jun. 30, 2019	0	19,261,989
Balance at Mar. 31, 2019	$ 0	$ 19,326,000	150,877,000	42,947,000	(2,652,000)	2,652,000	301,000	213,451,000
Balance (in shares) at Mar. 31, 2019	0	19,326,485
Net income	$ 0	$ 0	0	3,448,000	0	0	0	3,448,000
Other comprehensive income (loss)	0	0	0	0	0	0	612,000	612,000
Stock repurchases	$ 0	$ (64,000)	(662,000)	0	0	0	0	(726,000)
Stock repurchases (in shares)	0	(64,496)
Stock option exercises	$ 0	$ 0	0	0	0	0	0	0
Stock option exercises (in shares)	0
Stock-based compensation	$ 0	0	60,000	0	0	0	0	60,000
Balance at Jun. 30, 2019	$ 0	$ 19,262,000	150,275,000	46,395,000	(2,652,000)	2,652,000	913,000	216,845,000
Balance (in shares) at Jun. 30, 2019	0	19,261,989
Balance at Dec. 31, 2019		$ 18,330,000	140,870,000	52,675,000	(2,815,000)	2,815,000	900,000	212,775,000
Balance (in shares) at Dec. 31, 2019		18,330,058
Net income				1,104,000				1,104,000
Other comprehensive income (loss)							562,000	562,000
Stock repurchases		$ (275,000)	(2,193,000)					(2,468,000)
Stock repurchases (in shares)		(275,366)
Stock option exercises		$ 1,000	6,000					7,000
Stock option exercises (in shares)		1,000
Stock-based compensation			105,000					105,000
Directors' equity incentive plan, net					24,000	(24,000)
Balance at Mar. 31, 2020		$ 18,056,000	138,788,000	53,779,000	(2,791,000)	2,791,000	1,462,000	212,085,000
Balance (in shares) at Mar. 31, 2020		18,055,692
Balance at Dec. 31, 2019		$ 18,330,000	140,870,000	52,675,000	(2,815,000)	2,815,000	900,000	212,775,000
Balance (in shares) at Dec. 31, 2019		18,330,058
Net income								1,785,000
Balance at Jun. 30, 2020		$ 17,863,000	137,559,000	54,460,000	(2,553,000)	2,553,000	1,656,000	211,538,000
Balance (in shares) at Jun. 30, 2020		17,862,554
Balance at Mar. 31, 2020		$ 18,056,000	138,788,000	53,779,000	(2,791,000)	2,791,000	1,462,000	212,085,000
Balance (in shares) at Mar. 31, 2020		18,055,692
Net income				681,000				681,000
Other comprehensive income (loss)							194,000	194,000
Stock repurchases		$ (193,000)	(1,328,000)					(1,521,000)
Stock repurchases (in shares)		(193,138)
Stock-based compensation			99,000					99,000
Directors' equity incentive plan, net					238,000	(238,000)
Balance at Jun. 30, 2020		$ 17,863,000	$ 137,559,000	$ 54,460,000	$ (2,553,000)	$ 2,553,000	$ 1,656,000	$ 211,538,000
Balance (in shares) at Jun. 30, 2020		17,862,554