CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	TREASURY STOCK
Beginning Balance at Dec. 31, 2012	$ 93,726	$ 33,492	$ 18,157	$ 43,030	$ 5,357	$ (6,310)
Beginning Balance (in shares) at Dec. 31, 2012		4,019,112
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,589			10,589
Other comprehensive (loss) income	(10,963)				(10,963)
Dividends declared	(7,295)			(7,295)
Common shares issued for employee stock purchase plan (in shares)		1,394
Common shares issued for employee stock purchase plan	59	12	47
Common shares issued for acquisition of Luzerne National Bank Corporation (in shares)		978,977
Common shares issued for acquisition of Luzerne National Bank Corporation	39,736	8,158	31,578
Ending Balance at Sep. 30, 2013	125,852	41,662	49,782	46,324	(5,606)	(6,310)
Ending Balance (in shares) at Sep. 30, 2013		4,999,483
Beginning Balance at Dec. 31, 2013	127,815	41,665	49,800	47,554	(4,894)	(6,310)
Beginning Balance (in shares) at Dec. 31, 2013		4,999,929
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,725			11,725
Other comprehensive (loss) income	4,683				4,683
Dividends declared	(6,797)			(6,797)
Common shares issued for employee stock purchase plan (in shares)		2,043
Common shares issued for employee stock purchase plan	88	17	71
Purchases of treasury stock	(510)					(510)
Ending Balance at Sep. 30, 2014	$ 137,004	$ 41,682	$ 49,871	$ 52,482	$ (211)	$ (6,820)
Ending Balance (in shares) at Sep. 30, 2014		5,001,972