CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive (Loss) Income
Beginning balance at Dec. 31, 2018	$ 244,583	$ 12,835	$ 185,174	$ 80,088	$ (24,352)	$ (9,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	5,337			5,337
Other comprehensive income (loss)	3,995					3,995
Exercise of stock options	481	19	462
Purchase of treasury stock	(2,215)				(2,215)
Restricted stock grants		31	(31)
Stock based compensation	137		137
Dividends: Common Stock	(2,008)			(2,008)
Ending balance at Mar. 31, 2019	250,310	12,885	185,742	83,417	(26,567)	(5,167)
Beginning balance at Dec. 31, 2019	261,551	12,905	186,692	98,239	(34,492)	(1,793)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact of adoption of ASC 326, net of tax of $955	(3,593)			(3,593)
Net earnings	6,278			6,278
Other comprehensive income (loss)	2,119					2,119
Exercise of stock options	72	3	69
Purchase of treasury stock	(10,817)				(10,817)
Stock based compensation	155		155
Dividends: Common Stock	(2,119)			(2,119)
Ending balance at Mar. 31, 2020	$ 253,646	$ 12,908	$ 186,916	$ 98,805	$ (45,309)	$ 326