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Regulatory Restrictions, Summary of Company's and Banks Actual and Minimum Capital Required Amounts and Ratios (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk-Weighted Assets) Consolidated, Actual Amount $ 37,412us-gaap_Capital $ 34,880us-gaap_Capital
Tier I Capital (to Risk-Weighted Assets) Consolidated, Actual Amount 35,225us-gaap_TierOneRiskBasedCapital 32,872us-gaap_TierOneRiskBasedCapital
Tier I Capital (to Average Assets) Consolidated, Actual Amount 35,225us-gaap_TierOneLeverageCapital 32,872us-gaap_TierOneLeverageCapital
Total Capital (to Risk-Weighted Assets) Consolidated, Actual Ratio (in hundredths) 21.55%us-gaap_CapitalToRiskWeightedAssets 21.90%us-gaap_CapitalToRiskWeightedAssets
Tier I Capital (to Risk-Weighted Assets) Consolidated, Actual Ratio (in hundredths) 20.29%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 20.64%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Tier I Capital (to Average Assets) Consolidated, Actual Ratio (in hundredths) 13.93%us-gaap_TierOneLeverageCapitalToAverageAssets 13.58%us-gaap_TierOneLeverageCapitalToAverageAssets
Total Capital (to Risk-Weighted Assets) Consolidated Minimum Required For Capital Adequacy Purposes, Amount 13,888us-gaap_CapitalRequiredForCapitalAdequacy 12,740us-gaap_CapitalRequiredForCapitalAdequacy
Tier I Capital (to Risk-Weighted Assets) Consolidated Minimum Required For Capital Adequacy Purposes, Amount 6,944us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy 6,370us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Tier I Capital (to Average Assets) Consolidated Minimum Required For Capital Adequacy Purposes, Amount 10,117us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy 9,685us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Total Capital (to Risk-Weighted Assets) Consolidated, Minimum Required For Capital Adequacy Purposes, Ratio (in hundredths) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier I Capital (to Risk-Weighted Assets) Consolidated Minimum Required For Capital Adequacy Purposes, Ratio (in hundredths) 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier I Capital (to Average Assets) Consolidated Minimum Required For Capital Adequacy Purposes, Ratio (in hundredths) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Surrey Bank & Trust [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk-Weighted Assets) Consolidated, Actual Amount 36,623us-gaap_Capital
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 34,154us-gaap_Capital
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Risk-Weighted Assets) Consolidated, Actual Amount 34,438us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 32,148us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Average Assets) Consolidated, Actual Amount 34,438us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 32,148us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Total Capital (to Risk-Weighted Assets) Consolidated, Actual Ratio (in hundredths) 21.11%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 21.46%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Risk-Weighted Assets) Consolidated, Actual Ratio (in hundredths) 19.85%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 20.20%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Average Assets) Consolidated, Actual Ratio (in hundredths) 13.65%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 13.31%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Total Capital (to Risk-Weighted Assets) Consolidated Minimum Required For Capital Adequacy Purposes, Amount 13,878us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 12,730us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Risk-Weighted Assets) Consolidated Minimum Required For Capital Adequacy Purposes, Amount 6,939us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 6,365us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Average Assets) Consolidated Minimum Required For Capital Adequacy Purposes, Amount 10,094us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 9,663us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Total Capital (to Risk-Weighted Assets) Consolidated, Minimum Required For Capital Adequacy Purposes, Ratio (in hundredths) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Risk-Weighted Assets) Consolidated Minimum Required For Capital Adequacy Purposes, Ratio (in hundredths) 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Average Assets) Consolidated Minimum Required For Capital Adequacy Purposes, Ratio (in hundredths) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Total Capital (to Risk-Weighted Assets) Consolidated Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 17,348us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 15,913us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Risk-Weighted Assets) Consolidated Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 10,409us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 9,548us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Average Assets) Consolidated, Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 12,618us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 $ 12,079us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Total Capital (to Risk-Weighted Assets) Consolidated Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (in hundredths) 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Risk-Weighted Assets) Consolidated Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (in hundredths) 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember
Tier I Capital (to Average Assets) Consolidated, Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (in hundredths) 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember		 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= sryb_SurreyBankAndTrustMember