CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2017	$ 207,345	$ 0	$ 11,921	$ 155,601	$ 66,037	$ (20,087)	$ (6,127)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	14,084				14,084
Other comprehensive income (loss)	(4,492)						(4,492)
Reclassification of certain tax effects from accumulated other comprehensive income					486		(486)
Exercise of stock options	140		6	134
Purchase of treasury stock	(9)					(9)
Issuance of common stock	29,568		900	28,668
Stock based compensation	378			378
Dividends: Common Stock	(5,017)				(5,017)
Ending balance at Sep. 30, 2018	241,997	0	12,827	184,781	75,590	(20,096)	(11,105)
Beginning balance at Jun. 30, 2018	239,658	0	12,823	184,548	72,293	(20,087)	(9,919)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	5,091				5,091
Other comprehensive income (loss)	(1,186)						(1,186)
Exercise of stock options	94		4	90
Purchase of treasury stock	(9)					(9)
Stock based compensation	143			143
Dividends: Common Stock	(1,794)				(1,794)
Ending balance at Sep. 30, 2018	241,997	0	12,827	184,781	75,590	(20,096)	(11,105)
Beginning balance at Dec. 31, 2018	244,583	0	12,835	185,174	80,088	(24,352)	(9,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	18,910				18,910
Other comprehensive income (loss)	7,484						7,484
Exercise of stock options	553		24	529
Purchase of treasury stock	(10,067)					(10,067)
Restricted stock grants			31	(31)
Stock based compensation	493			493
Dividends: Common Stock	(6,051)				(6,051)
Ending balance at Sep. 30, 2019	255,905	0	12,890	186,165	92,947	(34,419)	(1,678)
Beginning balance at Jun. 30, 2019	250,121	0	12,886	185,918	87,492	(33,549)	(2,626)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	7,530				7,530
Other comprehensive income (loss)	948						948
Exercise of stock options	72		4	68
Purchase of treasury stock	(870)					(870)
Stock based compensation	179			179
Dividends: Common Stock	(2,075)				(2,075)
Ending balance at Sep. 30, 2019	$ 255,905	$ 0	$ 12,890	$ 186,165	$ 92,947	$ (34,419)	$ (1,678)