Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2012	$ 145,364	$ 44,223	$ 88,960	$ (1,743)	$ 13,924
Net income	16,679		16,679
Other comprehensive income (loss)	(23,369)				(23,369)
Common stock issued in acquisition	33,561	33,561
Restricted stock award grants		(471)		471
Exercise of stock options, including tax benefit	733	182		551
Stock based compensation expense	390	390
Reissue of treasury stock	126	38		88
Cash dividends declared	(8,573)		(8,573)
Ending balance at Dec. 31, 2013	164,911	77,923	97,066	(633)	(9,445)
Net income	23,074		23,074
Other comprehensive income (loss)	10,504				10,504
Restricted stock award grants		(497)		497
Exercise of stock options, including tax benefit	573	7		566
Stock based compensation expense	548	548
Purchase of treasury stock	(1,675)			(1,675)
Reissue of treasury stock	134	41		93
Cash dividends declared	(9,521)		(9,521)
Ending balance at Dec. 31, 2014	188,548	78,022	110,619	(1,152)	1,059
Net income	22,197		22,197
Other comprehensive income (loss)	840				840
Restricted stock award grants		(803)		803
Stock based compensation expense	621	621
Purchase of treasury stock	(868)			(868)
Reissue of treasury stock	90	(13)		103
Cash dividends declared	(9,515)		(9,515)
Ending balance at Dec. 31, 2015	$ 201,913	$ 77,827	$ 123,301	$ (1,114)	$ 1,899