Loans (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Jun. 01, 2013
Aging categories of loans by segment
Current	$ 923,139,000		$ 895,468,000
Past Due 30 To 89 Days	10,796,000		9,053,000
Past Due 90 Days Or More & Still Accruing	391,000		387,000
Non-Accrual	10,766,000		11,861,000
Total	945,092,000		916,769,000
Net deferred loan fees and discounts	(1,222,000)		(1,190,000)
Allowance for loan losses	(10,826,000)	(8,520,000)	(10,579,000)	(10,144,000)
Current loans, net	911,091,000		883,699,000
Loans, net	933,044,000		905,000,000
Components of the purchase accounting adjustments related to the purchased impaired loans acquired
Unpaid principal balance	18,979,000		17,842,000
Acquired Loans with Specific Evidence of Deterioration in Credit Quality (ASC 310-30)
Interest Income That Would Have Been Recorded Based on Original Term and Rate	137,000	160,000
Interest Income Recorded on a Cash Basis	49,000	46,000
Luzerne acquisition
Components of the purchase accounting adjustments related to the purchased impaired loans acquired
Estimated fair value					878,000
Commercial, financial, and agricultural
Aging categories of loans by segment
Current	130,868,000		122,624,000
Past Due 30 To 89 Days	665,000		773,000
Past Due 90 Days Or More & Still Accruing	216,000		0
Non-Accrual	834,000		759,000
Total	132,583,000		124,156,000
Allowance for loan losses	(1,478,000)	(537,000)	(1,124,000)	(474,000)
Components of the purchase accounting adjustments related to the purchased impaired loans acquired
Unpaid principal balance	1,186,000		1,112,000
Acquired Loans with Specific Evidence of Deterioration in Credit Quality (ASC 310-30)
Interest Income That Would Have Been Recorded Based on Original Term and Rate	12,000	2,000
Interest Income Recorded on a Cash Basis	8,000	0
Real estate mortgages
Loan credit quality and related allowance for loan losses
Number of categories in which real estate loans are segmented	3
Residential
Aging categories of loans by segment
Current	466,322,000		450,503,000
Past Due 30 To 89 Days	7,043,000		6,078,000
Past Due 90 Days Or More & Still Accruing	129,000		332,000
Non-Accrual	709,000		847,000
Total	474,203,000		457,760,000
Allowance for loan losses	(4,227,000)	(3,062,000)	(3,755,000)	(3,917,000)
Components of the purchase accounting adjustments related to the purchased impaired loans acquired
Unpaid principal balance	2,008,000		1,588,000
Acquired Loans with Specific Evidence of Deterioration in Credit Quality (ASC 310-30)
Interest Income That Would Have Been Recorded Based on Original Term and Rate	5,000	8,000
Interest Income Recorded on a Cash Basis	9,000	4,000
Commercial
Aging categories of loans by segment
Current	281,544,000		279,731,000
Past Due 30 To 89 Days	2,682,000		1,819,000
Past Due 90 Days Or More & Still Accruing	0		54,000
Non-Accrual	8,311,000		9,744,000
Total	292,537,000		291,348,000
Allowance for loan losses	(3,873,000)	(3,324,000)	(4,205,000)	(4,079,000)
Components of the purchase accounting adjustments related to the purchased impaired loans acquired
Unpaid principal balance	14,868,000		14,117,000
Acquired Loans with Specific Evidence of Deterioration in Credit Quality (ASC 310-30)
Interest Income That Would Have Been Recorded Based on Original Term and Rate	105,000	131,000
Interest Income Recorded on a Cash Basis	25,000	34,000
Construction
Aging categories of loans by segment
Current	21,538,000		21,485,000
Past Due 30 To 89 Days	4,000		0
Past Due 90 Days Or More & Still Accruing	46,000		0
Non-Accrual	908,000		511,000
Total	22,496,000		21,996,000
Allowance for loan losses	(752,000)	(795,000)	(786,000)	(741,000)
Components of the purchase accounting adjustments related to the purchased impaired loans acquired
Unpaid principal balance	917,000		1,025,000
Acquired Loans with Specific Evidence of Deterioration in Credit Quality (ASC 310-30)
Interest Income That Would Have Been Recorded Based on Original Term and Rate	15,000	19,000
Interest Income Recorded on a Cash Basis	7,000	8,000
Installment loans to individuals
Aging categories of loans by segment
Current	22,867,000		21,125,000
Past Due 30 To 89 Days	402,000		383,000
Past Due 90 Days Or More & Still Accruing	0		1,000
Non-Accrual	4,000		0
Total	23,273,000		21,509,000
Allowance for loan losses	(193,000)	(161,000)	(245,000)	(139,000)
Purchased loans | Luzerne acquisition
Components of the purchase accounting adjustments related to the purchased impaired loans acquired
Unpaid principal balance					1,211,000
Contractual cash flows					1,783,000
Expected cash flows					941,000
Non-accretable discount					842,000
Accretable discount		28,000			63,000
Changes in the amortizable yield for purchased credit-impaired loans
Balance at beginning of period or at acquisition		35,000			63,000
Accretion		(7,000)
Balance at end of period		28,000			63,000
Acquired Loans with Specific Evidence of Deterioration in Credit Quality (ASC 310-30)
Outstanding balance	447,000		449,000
Carrying amount	347,000		349,000
Receivables Acquired with Deteriorated Credit Quality
Acquired Loans with Specific Evidence of Deterioration in Credit Quality (ASC 310-30)
Allowance for loan losses	$ 0