Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total		Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2014	$ 173,780		$ 7,872	$ 57,650	$ 104,594	$ 3,664
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,395				6,395
Other comprehensive income (loss)	(1,262)					(1,262)
Issuance of common stock	20,483		826	19,657
Stock repurchased	(1,175)		(52)	(1,123)
Stock options exercised	265		15	250
Equity based compensation	402		10	392
Cash dividends paid	(4,005)				(4,005)
Ending Balance at Jun. 30, 2015	194,883		8,671	76,826	106,984	2,402
Beginning Balance at Mar. 31, 2015						4,265
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,880
Other comprehensive income (loss)	(1,863)
Ending Balance at Jun. 30, 2015	194,883		8,671	76,826	106,984	2,402
Beginning Balance at Dec. 31, 2015	197,835	[1]	8,605	75,375	111,565	2,290
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,216				8,216
Other comprehensive income (loss)	1,441					1,441
Stock repurchased	(1,203)		(48)	(1,155)
Stock options exercised	101		4	97
Vesting of restricted stock			3	(3)
Equity based compensation	447		8	439
Cash dividends paid	(4,133)				(4,133)
Ending Balance at Jun. 30, 2016	202,704		8,572	74,753	115,648	3,731
Beginning Balance at Mar. 31, 2016						3,496
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,088
Other comprehensive income (loss)	235
Ending Balance at Jun. 30, 2016	$ 202,704		$ 8,572	$ 74,753	$ 115,648	$ 3,731

[1] Derived from audited consolidated financial statements.