CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Dec. 31, 2019	$ 133,795	$ 102,743	$ 3,703	$ 240,241
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	10,874	0	10,874
Other comprehensive income	0	0	7,024	7,024
Cash dividends paid	0	(4,401)	0	(4,401)
Stock options exercised	31	0	0	31
Stock based compensation expense	226	0	0	226
Balances at Jun. 30, 2020	134,052	109,216	10,727	253,995
Balances at Mar. 31, 2020	133,866	105,911	9,148	248,925
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	5,506	0	5,506
Other comprehensive income	0	0	1,579	1,579
Cash dividends paid	0	(2,201)	0	(2,201)
Stock based compensation expense	186	0	0	186
Balances at Jun. 30, 2020	134,052	109,216	10,727	253,995
Balances at Dec. 31, 2020	134,110	116,378	9,419	259,907
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	11,724	0	11,724
Other comprehensive income	0	0	(4,336)	(4,336)
Cash dividends paid	0	(19,132)	0	(19,132)
Stock options exercised	991	0	0	991
Stock based compensation expense	31	0	0	31
Balances at Jun. 30, 2021	135,132	108,970	5,083	249,185
Balances at Mar. 31, 2021	134,322	106,017	5,340	245,679
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	5,174	0	5,174
Other comprehensive income	0	0	(257)	(257)
Cash dividends paid	0	(2,221)	0	(2,221)
Stock options exercised	800	0	0	800
Stock based compensation expense	10	0	0	10
Balances at Jun. 30, 2021	$ 135,132	$ 108,970	$ 5,083	$ 249,185