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, 2017	$ 110,445	$ 74,983	$ (2,073)	$ 183,355
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	9,508	0	9,508
Other comprehensive income (loss)	0	0	(3,921)	(3,921)
Cash dividends paid	0	(3,606)	0	(3,606)
Cash in lieu of fractional share for 5 for 4 stock split	0	(13)	0	(13)
Stock options exercised	101	0	0	101
Stock based compensation expense	181	0	0	181
Balances at Jun. 30, 2018	110,727	80,872	(5,994)	185,605
Balances at Mar. 31, 2018	110,485	78,515	(5,124)	183,876
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	4,375	0	4,375
Other comprehensive income (loss)	0	0	(870)	(870)
Cash dividends paid	0	(2,005)	0	(2,005)
Cash in lieu of fractional share for 5 for 4 stock split	0	(13)	0	(13)
Stock options exercised	88	0	0	88
Stock based compensation expense	154	0	0	154
Balances at Jun. 30, 2018	110,727	80,872	(5,994)	185,605
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