CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Dec. 31, 2018	$ 133,248	$ 87,333	$ (3,852)	$ 216,729
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	12,035	0	12,035
Other comprehensive income (loss)	0	0	7,579	7,579
Cash dividends paid	0	(4,390)	0	(4,390)
Stock options exercised	140	0	0	140
Stock based compensation expense	209	0	0	209
Balances at Jun. 30, 2019	133,597	94,978	3,727	232,302
Balances at Mar. 31, 2019	133,338	91,314	575	225,227
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	5,859	0	5,859
Other comprehensive income (loss)	0	0	3,152	3,152
Cash dividends paid	0	(2,195)	0	(2,195)
Stock options exercised	89	0	0	89
Stock based compensation expense	170	0	0	170
Balances at Jun. 30, 2019	133,597	94,978	3,727	232,302
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 (loss)	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 (loss)	0	0	1,579	1,579
Cash dividends paid	0	(2,201)	0	(2,201)
Stock options exercised	0	0	0	0
Stock based compensation expense	186	0	0	186
Balances at Jun. 30, 2020	$ 134,052	$ 109,216	$ 10,727	$ 253,995