Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total		Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accounting for late charges						$ (650)
Beginning Balance at Dec. 31, 2017	$ 208,717		$ 8,604	$ 76,179	$ 127,010	(3,076)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	11,792				11,792
Other comprehensive income (loss)	(4,184)					(4,184)
Stock options exercised	775		32	743
Vesting of restricted stock	0		10	(10)
Equity based compensation	592		8	584
Cash dividends paid	(4,344)				(4,344)
Ending Balance at Jun. 30, 2018	213,348		8,654	77,496	135,108	(7,910)
Beginning Balance at Mar. 31, 2018	209,840		8,621	76,525	131,299	(6,605)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5,980				5,980
Other comprehensive income (loss)	(1,305)					(1,305)
Stock options exercised	690		29	661
Vesting of restricted stock	0		0	0
Equity based compensation	314		4	310
Cash dividends paid	(2,171)				(2,171)
Ending Balance at Jun. 30, 2018	213,348		8,654	77,496	135,108	(7,910)
Beginning Balance at Dec. 31, 2018	222,542	[1]	8,668	78,172	141,537	(5,835)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4,773				4,773
Other comprehensive income (loss)	4,752					4,752
Issuance of common stock	82,470		2,362	80,108
Issuance of replacement options/restricted stock	870			870
Stock options exercised	578		30	548
Vesting of restricted stock	0		20	(20)
Equity based compensation	903		9	894
Cash dividends paid	(4,971)				(4,971)
Ending Balance at Jun. 30, 2019	311,917		11,089	160,572	141,339	(1,083)
Beginning Balance at Mar. 31, 2019	229,473		8,705	78,738	145,351	(3,321)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,230)				(1,230)
Other comprehensive income (loss)	2,238					2,238
Issuance of common stock	82,470		2,362	80,108
Issuance of replacement options/restricted stock	870			870
Stock options exercised	288		17	271
Vesting of restricted stock	0		0	0
Equity based compensation	590		5	585
Cash dividends paid	(2,782)				(2,782)
Ending Balance at Jun. 30, 2019	$ 311,917		$ 11,089	$ 160,572	$ 141,339	$ (1,083)

[1] Derived from audited consolidated financial statements.