Regulatory Matters (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Maximum Subsidiary Dividend	$ 88,800
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Actual, Amount
Total Capital (to Risk Weighted Assets)	435,857	$ 400,661
Tier I Capital (to Risk Weighted Assets)	404,059	371,556
Tier One Capital (to Average Assets)	404,059	371,556
Common Equity Tier 1 Capital (to Risk Weighted Assets)	$ 384,003	$ 351,497
Actual, Ratio
Total Capital (to Risk Weighted Assets)	0.151	0.157
Tier I Capital (to Risk Weighted Assets)	0.140	0.146
Tier One Leverage Capital (to Average Assets)	0.098	0.092
Common Equity Tier 1 Capital (to Risk Weighted Assets)	0.133	0.138
Minimum Amounts For Capital Adequacy, Amount
Total Capital (to Risk Weighted Assets)	$ 303,079	$ 267,958
Tier I Capital (to Risk Weighted Assets)	245,322	216,317
Tier One Leverage Capital (to Average Assets)	164,922	161,546
Common Equity Tier 1 Capital (to Risk Weighted Assets)	$ 202,107	$ 178,296
Minimum Amounts For Capital Adequacy Purposes, Ratio
Total Capital (to Risk Weighted Assets)	0.105	0.105
Tier I Capital (to Risk Weighted Assets)	0.085	0.085
Tier One Leverage Capital (to Average Assets)	0.040	0.040
Common Equity Tier 1 Capital (to Risk Weighted Assets)	0.070	0.070
Minimum Amounts To Be Well-Capitalized, Amount
Total Capital (to Risk Weighted Assets)	$ 288,647	$ 255,198
Tier I Capital (to Risk Weighted Assets)	230,891	203,592
Tier One Leverage Capital (to Average Assets)	206,153	201,933
Common Equity Tier 1 Leverage Capital (to Risk Weighted Assets)	$ 187,671	$ 165,560
Minimum Amounts To Be Well-Capitalized
Total Capital (to Risk Weighted Assets)	0.100	0.100
Tier One Risk Based Capital (to Risk Weighted Assets)	0.080	0.080
Tier One Leverage Capital (to Average Assets)	0.050	0.050
Common Equity Tier 1 Capital (to Risk Weighted Assets)	0.065	0.065
Glens Falls National
Actual, Amount
Total Capital (to Risk Weighted Assets)	$ 315,458	$ 295,047
Tier I Capital (to Risk Weighted Assets)	292,134	274,208
Tier One Capital (to Average Assets)	292,134	274,208
Common Equity Tier 1 Capital (to Risk Weighted Assets)	$ 292,078	$ 274,149
Actual, Ratio
Total Capital (to Risk Weighted Assets)	0.143	0.151
Tier I Capital (to Risk Weighted Assets)	0.132	0.141
Tier One Leverage Capital (to Average Assets)	0.090	0.086
Common Equity Tier 1 Capital (to Risk Weighted Assets)	0.132	0.141
Minimum Amounts For Capital Adequacy, Amount
Total Capital (to Risk Weighted Assets)	$ 231,630	$ 205,165
Tier I Capital (to Risk Weighted Assets)	188,117	165,303
Tier One Leverage Capital (to Average Assets)	129,837	127,539
Common Equity Tier 1 Capital (to Risk Weighted Assets)	$ 154,890	$ 136,102
Minimum Amounts For Capital Adequacy Purposes, Ratio
Total Capital (to Risk Weighted Assets)	0.105	0.105
Tier I Capital (to Risk Weighted Assets)	0.085	0.085
Tier One Leverage Capital (to Average Assets)	0.040	0.040
Common Equity Tier 1 Capital (to Risk Weighted Assets)	0.070	0.070
Minimum Amounts To Be Well-Capitalized, Amount
Total Capital (to Risk Weighted Assets)	$ 220,600	$ 195,395
Tier I Capital (to Risk Weighted Assets)	177,051	155,579
Tier One Leverage Capital (to Average Assets)	162,297	159,423
Common Equity Tier 1 Leverage Capital (to Risk Weighted Assets)	$ 143,826	$ 126,381
Minimum Amounts To Be Well-Capitalized
Total Capital (to Risk Weighted Assets)	0.100	0.100
Tier One Risk Based Capital (to Risk Weighted Assets)	0.080	0.080
Tier One Leverage Capital (to Average Assets)	0.050	0.050
Common Equity Tier 1 Capital (to Risk Weighted Assets)	0.065	0.065
Saratoga National
Actual, Amount
Total Capital (to Risk Weighted Assets)	$ 104,279	$ 90,924
Tier I Capital (to Risk Weighted Assets)	95,891	83,432
Tier One Capital (to Average Assets)	95,891	83,432
Common Equity Tier 1 Capital (to Risk Weighted Assets)	$ 95,891	$ 83,432
Actual, Ratio
Total Capital (to Risk Weighted Assets)	0.155	0.152
Tier I Capital (to Risk Weighted Assets)	0.143	0.139
Tier One Leverage Capital (to Average Assets)	0.105	0.098
Common Equity Tier 1 Capital (to Risk Weighted Assets)	0.143	0.139
Minimum Amounts For Capital Adequacy, Amount
Total Capital (to Risk Weighted Assets)	$ 70,641	$ 62,809
Tier I Capital (to Risk Weighted Assets)	56,998	51,020
Tier One Leverage Capital (to Average Assets)	36,530	34,054
Common Equity Tier 1 Capital (to Risk Weighted Assets)	$ 46,940	$ 42,016
Minimum Amounts For Capital Adequacy Purposes, Ratio
Total Capital (to Risk Weighted Assets)	0.105	0.105
Tier I Capital (to Risk Weighted Assets)	0.085	0.085
Tier One Leverage Capital (to Average Assets)	0.040	0.040
Common Equity Tier 1 Capital (to Risk Weighted Assets)	0.070	0.070
Minimum Amounts To Be Well-Capitalized, Amount
Total Capital (to Risk Weighted Assets)	$ 67,277	$ 59,818
Tier I Capital (to Risk Weighted Assets)	53,645	48,018
Tier One Leverage Capital (to Average Assets)	45,662	42,567
Common Equity Tier 1 Leverage Capital (to Risk Weighted Assets)	$ 43,587	$ 39,015
Minimum Amounts To Be Well-Capitalized
Total Capital (to Risk Weighted Assets)	0.100	0.100
Tier One Risk Based Capital (to Risk Weighted Assets)	0.080	0.080
Tier One Leverage Capital (to Average Assets)	0.050	0.050
Common Equity Tier 1 Capital (to Risk Weighted Assets)	0.065	0.065