Credit Quality and Related Allowance for Loan Losses (Details) (USD $)	3 Months Ended		9 Months Ended							3 Months Ended		9 Months Ended						9 Months Ended	3 Months Ended		9 Months Ended						3 Months Ended		9 Months Ended						3 Months Ended		9 Months Ended												16 Months Ended	4 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012	Jun. 01, 2013 Luzerne acquisition	Sep. 30, 2014 Commercial and agricultural	Sep. 30, 2013 Commercial and agricultural	Sep. 30, 2014 Commercial and agricultural	Sep. 30, 2013 Commercial and agricultural	Jun. 30, 2014 Commercial and agricultural	Dec. 31, 2013 Commercial and agricultural	Jun. 30, 2013 Commercial and agricultural	Dec. 31, 2012 Commercial and agricultural	Sep. 30, 2014 Real estate mortgages category	Sep. 30, 2014 Residential	Sep. 30, 2013 Residential	Sep. 30, 2014 Residential	Sep. 30, 2013 Residential	Jun. 30, 2014 Residential	Dec. 31, 2013 Residential	Jun. 30, 2013 Residential	Dec. 31, 2012 Residential	Sep. 30, 2014 Commercial	Sep. 30, 2013 Commercial	Sep. 30, 2014 Commercial	Sep. 30, 2013 Commercial	Jun. 30, 2014 Commercial	Dec. 31, 2013 Commercial	Jun. 30, 2013 Commercial	Dec. 31, 2012 Commercial	Sep. 30, 2014 Construction	Sep. 30, 2013 Construction	Sep. 30, 2014 Construction	Sep. 30, 2013 Construction	Jun. 30, 2014 Construction	Dec. 31, 2013 Construction	Jun. 30, 2013 Construction	Dec. 31, 2012 Construction	Sep. 30, 2014 Installment loans to individuals	Jun. 30, 2014 Installment loans to individuals	Dec. 31, 2013 Installment loans to individuals	Sep. 30, 2013 Installment loans to individuals	Jun. 30, 2013 Installment loans to individuals	Dec. 31, 2012 Installment loans to individuals	Sep. 30, 2014 Purchased loans	Sep. 30, 2013 Purchased loans Luzerne acquisition	Sep. 30, 2014 Purchased loans Luzerne acquisition	Dec. 31, 2013 Purchased loans Luzerne acquisition	Jun. 01, 2013 Purchased loans Luzerne acquisition
Loan credit quality and related allowance for loan losses
Number of categories in which real estate loans are segmented																		3
Aging categories of loans by segment
Current	$ 875,275,000		$ 875,275,000			$ 799,601,000				$ 123,317,000		$ 123,317,000			$ 104,419,000				$ 432,722,000		$ 432,722,000			$ 392,300,000			$ 277,696,000		$ 277,696,000			$ 272,745,000			$ 21,132,000		$ 21,132,000			$ 15,967,000			$ 20,408,000		$ 14,170,000
Past Due 30 To 89 Days	4,440,000		4,440,000			9,936,000				142,000		142,000			502,000				1,742,000		1,742,000			6,424,000			2,235,000		2,235,000			2,533,000			10,000		10,000			0			311,000		477,000
Past Due 90 Days Or More & Still Accruing	202,000		202,000			604,000				0		0			0				202,000		202,000			531,000			0		0			0			0		0			73,000			0		0
Non-Accrual	12,092,000		12,092,000			9,074,000				820,000		820,000			108,000				808,000		808,000			526,000			9,452,000		9,452,000			7,198,000			1,012,000		1,012,000			1,242,000			0		0
Total	892,009,000		892,009,000			819,215,000				124,279,000		124,279,000			105,029,000				435,474,000		435,474,000			399,781,000			289,383,000		289,383,000			282,476,000			22,154,000		22,154,000			17,282,000			20,719,000		14,647,000
Net deferred loan fees and discounts	(1,282,000)		(1,282,000)			(871,000)
Allowance for loan losses	(9,250,000)	(9,630,000)	(9,250,000)	(9,630,000)	(8,811,000)	(10,144,000)	(9,404,000)	(7,617,000)		(828,000)	(520,000)	(828,000)	(520,000)	(694,000)	(474,000)	(540,000)	(361,000)		(3,423,000)	(3,458,000)	(3,423,000)	(3,458,000)	(3,262,000)	(3,917,000)	(3,045,000)	(1,954,000)	(3,677,000)	(3,765,000)	(3,677,000)	(3,765,000)	(3,394,000)	(4,079,000)	(3,988,000)	(3,831,000)	(785,000)	(752,000)	(785,000)	(752,000)	(718,000)	(741,000)	(843,000)	(950,000)	(236,000)	(198,000)	(139,000)	(140,000)	(141,000)	(144,000)
Current loans, net	864,743,000		864,743,000			788,586,000
Loans, net	881,477,000		881,477,000			808,200,000			249,789,000
Material increases or decreases in the expected cash flows from credit-impaired loans since acquisition																																																	0
Components of the purchase accounting adjustments related to the purchased impaired loans acquired
Unpaid principal balance	16,218,000		16,218,000			12,563,000				1,136,000		1,136,000			532,000				1,477,000		1,477,000			1,515,000			11,435,000		11,435,000			8,621,000			2,170,000		2,170,000			1,895,000													1,211,000
Estimated fair value									878,000
Contractual cash flows																																																					1,783,000
Expected cash flows																																																					941,000
Non-accretable discount																																																					842,000
Accretable discount																																																		46,000	23,000
Changes in the amortizable yield for purchased credit-impaired loans
Balance at beginning of period or at acquisition																																																		63,000	35,000
Accretion																																																		(17,000)	(12,000)
Balance at end of period																																																		46,000	23,000
Acquired Loans with Specific Evidence of Deterioration in Credit Quality (ASC 310-30)
Outstanding balance																																																			755,000	1,224,000
Carrying amount	655,000		655,000			868,000				0		0			0				349,000		349,000			354,000			306,000		306,000			514,000			0		0			0			0						655,000		655,000	868,000
Interest Income That Would Have Been Recorded Based on Original Term and Rate	213,000	78,000	547,000	333,000						17,000	0	34,000	4,000						31,000	13,000	38,000	67,000					147,000	49,000	422,000	165,000					18,000	16,000	53,000	97,000
Interest Income Recorded on a Cash Basis	$ 94,000	$ 23,000	$ 190,000	$ 144,000						$ 20,000	$ 0	$ 21,000	$ 0						$ 8,000	$ 10,000	$ 17,000	$ 22,000					$ 66,000	$ 5,000	$ 152,000	$ 89,000					$ 0	$ 8,000	$ 0	$ 33,000