CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common stock	Capital surplus	Retained earnings	Accumulated other comprehensive income (loss)	Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle | Adjustments for New Accounting Principle, Early Adoption [Member] | Accounting Standards Update 2016-09 [Member]		$ 87	$ (87)
Beginning Balance (Scenario, Previously Reported [Member]) at Dec. 31, 2015	$ 118	135,822	90,911	$ 6,029	$ 232,880
Beginning Balance at Dec. 31, 2015	118	135,909	90,824	6,029	232,880
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			5,119		5,119
Compensation expense for stock option grants		106			106
Amortization of restricted stock awards		124			124
Common dividends declared			(2,137)		(2,137)
Issuance of common stock under employee benefits plans		180			180
Other comprehensive income (loss)				2,114	2,114
Ending Balance at Mar. 31, 2016	118	136,319	93,806	8,143	238,386
Beginning Balance at Dec. 31, 2016	155	209,712	112,513	(610)	321,770
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			8,490		8,490
Compensation expense for stock option grants		132			132
Amortization of restricted stock awards		189			189
Common dividends declared			(3,129)		(3,129)
Acquisition of CedarPoint Investment Advisors, Inc.	1	3,712			3,713
Issuance of common stock under employee benefits plans	2	2,753			2,755
Other comprehensive income (loss)				413	413
Ending Balance at Mar. 31, 2017	$ 158	$ 216,498	$ 117,874	$ (197)	$ 334,333