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REGULATORY CAPITAL REQUIREMENTS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Total Capital (to risk weighted assets)    
Actual, Amount $ 207,340us-gaap_Capital $ 202,039us-gaap_Capital
Actual, Ratio (as a percent) 13.00%us-gaap_CapitalToRiskWeightedAssets 16.30%us-gaap_CapitalToRiskWeightedAssets
For Capital Adequacy Purposes, Amount 127,445us-gaap_CapitalRequiredForCapitalAdequacy 99,108us-gaap_CapitalRequiredForCapitalAdequacy
For Capital Adequacy Purposes, Ratio (as a percent) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier 1 Capital (to risk weighted assets)    
Actual, Amount 189,527us-gaap_TierOneRiskBasedCapital 186,547us-gaap_TierOneRiskBasedCapital
Actual, Ratio (as a percent) 11.90%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 15.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
For Capital Adequacy Purposes, Amount 63,722us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy 49,554us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
For Capital Adequacy Purposes, Ratio (as a percent) 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier 1 Capital (to average assets)    
Actual, Amount 189,527us-gaap_TierOneLeverageCapital 186,547us-gaap_TierOneLeverageCapital
Actual, Ratio (as a percent) 8.40%us-gaap_TierOneLeverageCapitalToAverageAssets 10.30%us-gaap_TierOneLeverageCapitalToAverageAssets
For Capital Adequacy Purposes, Amount 90,614us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy 72,476us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
For Capital Adequacy Purposes, Ratio (as a percent) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Bridgehampton National Bank    
Total Capital (to risk weighted assets)    
Actual, Amount 206,633us-gaap_Capital
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 164,494us-gaap_Capital
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
Actual, Ratio (as a percent) 13.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 13.30%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
For Capital Adequacy Purposes, Amount 127,427us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 99,084us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
For Capital Adequacy Purposes, Ratio (as a percent) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 159,284us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 123,855us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent) 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
Tier 1 Capital (to risk weighted assets)    
Actual, Amount 188,820us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 149,005us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
Actual, Ratio (as a percent) 11.90%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 12.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
For Capital Adequacy Purposes, Amount 63,714us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 49,542us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
For Capital Adequacy Purposes, Ratio (as a percent) 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 95,571us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 74,313us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent) 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
Tier 1 Capital (to average assets)    
Actual, Amount 188,820us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 149,005us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
Actual, Ratio (as a percent) 8.30%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 8.20%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
For Capital Adequacy Purposes, Amount 90,617us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 72,464us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
For Capital Adequacy Purposes, Ratio (as a percent) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 113,271us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 $ 90,580us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent) 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember		 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember