Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Maximum Subsidiary Dividend			$ 37,000
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk Weighted Assets) - Actual Amount	$ 258,653	$ 239,988
Total Capital (to Risk Weighted Assets) - Actual Ratio	15.20%	15.10%
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Amount	$ 146,343	$ 127,146
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	8.60%	8.00%
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Amount	$ 170,166	$ 158,932
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	10.00%	10.00%
Tier I Capital (to Risk Weighted Assets) - Actual Amount	$ 241,523	$ 223,899
Tier I Capital (to Risk Weighted Assets) - Actual Ratio	14.10%	14.10%
Tier I Capital (to Risk Weighted Assets) - Minimum Acounts For Capital Adequacy Purposes Amount	$ 113,053	$ 95,276
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	6.60%	6.00%
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	$ 137,034	$ 127,035
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Tier One Risk Based Capital	$ 241,523	$ 223,899
Tier One Leverage Capital to Average Assets	9.50%	9.30%
Tier One Leverage Capital Required for Capital Adequacy	$ 101,694	$ 96,301
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	$ 127,117	$ 120,376
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Common Equity Tier 1 Capital Ratio	$ 221,472	$ 203,848
Common Equity Tier 1 Capital Ratio Percentage	13.00%	12.80%
Common Equity Tier 1 Capital Ratio Required for Capital Adequacy	$ 86,885	$ 71,665
Common Equity Tier 1 Capital Ratio For Capital Adequacy	5.10%	4.50%
Common Equity Tier 1 Leverage Capital Required to be Well Capitalized	$ 110,736	$ 103,517
Common Equity Tier 1 Capital Ratio to be Well Capitalized	6.50%	6.50%
Glens Falls National [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk Weighted Assets) - Actual Amount	$ 205,573	$ 193,302
Total Capital (to Risk Weighted Assets) - Actual Ratio	15.00%	15.00%
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Amount	$ 117,862	$ 103,094
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	8.60%	8.00%
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Amount	$ 137,049	$ 128,868
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	10.00%	10.00%
Tier I Capital (to Risk Weighted Assets) - Actual Amount	$ 191,679	$ 180,280
Tier I Capital (to Risk Weighted Assets) - Actual Ratio	14.00%	14.00%
Tier I Capital (to Risk Weighted Assets) - Minimum Acounts For Capital Adequacy Purposes Amount	$ 90,363	$ 77,263
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	6.60%	6.00%
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	$ 109,531	$ 103,017
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Tier One Risk Based Capital	$ 191,679	$ 180,280
Tier One Leverage Capital to Average Assets	9.10%	8.90%
Tier One Leverage Capital Required for Capital Adequacy	$ 84,255	$ 81,025
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	$ 105,318	$ 101,281
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Common Equity Tier 1 Capital Ratio	$ 191,628	$ 180,229
Common Equity Tier 1 Capital Ratio Percentage	13.90%	14.00%
Common Equity Tier 1 Capital Ratio Required for Capital Adequacy	$ 70,310	$ 57,931
Common Equity Tier 1 Capital Ratio For Capital Adequacy	5.10%	4.50%
Common Equity Tier 1 Leverage Capital Required to be Well Capitalized	$ 89,610	$ 83,678
Common Equity Tier 1 Capital Ratio to be Well Capitalized	6.50%	6.50%
Saratoga National [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk Weighted Assets) - Actual Amount	$ 42,168	$ 37,658
Total Capital (to Risk Weighted Assets) - Actual Ratio	12.80%	12.60%
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Amount	$ 28,332	$ 23,910
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	8.60%	8.00%
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Amount	$ 32,944	$ 29,887
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	10.00%	10.00%
Tier I Capital (to Risk Weighted Assets) - Actual Amount	$ 39,050	$ 34,642
Tier I Capital (to Risk Weighted Assets) - Actual Ratio	11.90%	11.60%
Tier I Capital (to Risk Weighted Assets) - Minimum Acounts For Capital Adequacy Purposes Amount	$ 21,658	$ 17,918
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	6.60%	6.00%
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	$ 26,252	$ 23,891
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Tier One Risk Based Capital	$ 39,050	$ 34,642
Tier One Leverage Capital to Average Assets	8.90%	8.90%
Tier One Leverage Capital Required for Capital Adequacy	$ 17,551	$ 15,569
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	$ 21,938	$ 19,462
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Common Equity Tier 1 Capital Ratio	$ 39,050	$ 34,642
Common Equity Tier 1 Capital Ratio Percentage	11.90%	11.60%
Common Equity Tier 1 Capital Ratio Required for Capital Adequacy	$ 16,736	$ 13,439
Common Equity Tier 1 Capital Ratio For Capital Adequacy	5.10%	4.50%
Common Equity Tier 1 Leverage Capital Required to be Well Capitalized	$ 21,330	$ 19,411
Common Equity Tier 1 Capital Ratio to be Well Capitalized	6.50%	6.50%