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Loans and allowance for credit losses (Details 4) (Troubled Debt Restructurings that Subsequently Defaulted [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 Contracts | Mar. 31, 2012 Contracts
--- | --- | ---
Number of contracts | 3 | [1] | 3 | [1]
Recorded investment | $ 1,918 | [1] | $ 1,539 | [1]
Related allowance | 74 | [1] | 0 | [1]
Construction Loans [Member] |  |  |  |
Number of contracts | 0 | [1] | 1 | [1]
Recorded investment | 0 | [1] | 666 | [1]
Related allowance | 0 | [1] | 0 | [1]
Residential Real Estate [Member] |  |  |  |
Number of contracts | 2 | [1] | 2 | [1]
Recorded investment | 177 | [1] | 873 | [1]
Related allowance | 0 | [1] | 0 | [1]
Commercial Real Estate [Member] |  |  |  |
Number of contracts | 1 | [1] | 0 | [1]
Recorded investment | 1,741 | [1] | 0 | [1]
Related allowance | 74 | [1] | 0 | [1]
Commercial Loan [Member] |  |  |  |
Number of contracts | 0 | [1] | 0 | [1]
Recorded investment | 0 | [1] | 0 | [1]
Related allowance | 0 | [1] | 0 | [1]
Consumer Loan [Member] |  |  |  |
Number of contracts | 0 | [1] | 0 | [1]
Recorded investment | 0 | [1] | 0 | [1]
Related allowance | $ 0 | [1] | $ 0 | [1]
[1] | Generally, a loan is considered in default when principal or interest is past due 30 days or more.

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 3 months and for which there was a payment default. + References No definition available. + Details
Name: | shbi_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix: | shbi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 3 months, for which there was a payment default. + References No definition available. + Details
Name: | shbi_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix: | shbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance related to financing receivables modified by troubled debt restructurings within the previous 3 months, for which there was a payment default. + References No definition available. + Details
Name: | shbi_FinancingReceivableModificationsSubsequentDefaultRelatedAllowance
Namespace Prefix: | shbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant