REGULATORY CAPITAL REQUIREMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Total Capital (to risk weighted assets)
Actual, Amount	$ 202,039	$ 145,765
Actual, Ratio (as a percent)	16.30%	14.20%
For Capital Adequacy Purposes, Amount	99,108	82,171
For Capital Adequacy Purposes, Ratio (as a percent)	8.00%	8.00%
Tier 1 Capital (to risk weighted assets)
Actual, Amount	186,547	132,906
Actual, Ratio (as a percent)	15.10%	12.90%
For Capital Adequacy Purposes, Amount	49,554	41,085
For Capital Adequacy Purposes, Ratio (as a percent)	4.00%	4.00%
Tier 1 Capital (to average assets)
Actual, Amount	186,547	132,906
Actual, Ratio (as a percent)	10.30%	8.40%
For Capital Adequacy Purposes, Amount	72,476	63,136
For Capital Adequacy Purposes, Ratio (as a percent)	4.00%	4.00%
Bridgehampton National Bank
Total Capital (to risk weighted assets)
Actual, Amount	164,494	140,487
Actual, Ratio (as a percent)	13.30%	13.70%
For Capital Adequacy Purposes, Amount	99,084	82,155
For Capital Adequacy Purposes, Ratio (as a percent)	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	123,855	102,693
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	10.00%	10.00%
Tier 1 Capital (to risk weighted assets)
Actual, Amount	149,005	127,630
Actual, Ratio (as a percent)	12.00%	12.40%
For Capital Adequacy Purposes, Amount	49,542	41,077
For Capital Adequacy Purposes, Ratio (as a percent)	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	74,313	61,616
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	6.00%	6.00%
Tier 1 Capital (to average assets)
Actual, Amount	149,005	127,630
Actual, Ratio (as a percent)	8.20%	8.10%
For Capital Adequacy Purposes, Amount	72,464	63,132
For Capital Adequacy Purposes, Ratio (as a percent)	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 90,580	$ 78,915
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	5.00%	5.00%