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Loans and allowance for credit losses (Details 4) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 Contracts | Mar. 31, 2013 Contracts
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Number of contracts | 0 | [1] | 3 | [2]
Recorded investment | $ 0 | [1] | $ 1,918 | [2]
Related allowance | 0 | [1] | 74 | [2]
Troubled Debt Restructurings That Subsequently Defaulted [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Number of contracts | 0 | [1] | 0 | [2]
Recorded investment | 0 | [1] | 0 | [2]
Related allowance | 0 | [1] | 0 | [2]
Troubled Debt Restructurings That Subsequently Defaulted [Member] | Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Number of contracts | 0 | [1] | 2 | [2]
Recorded investment | 0 | [1] | 177 | [2]
Related allowance | 0 | [1] | 0 | [2]
Troubled Debt Restructurings That Subsequently Defaulted [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Number of contracts | 0 | [1] | 1 | [2]
Recorded investment | 0 | [1] | 1,741 | [2]
Related allowance | 0 | [1] | 74 | [2]
Troubled Debt Restructurings That Subsequently Defaulted [Member] | Commercial Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Number of contracts | 0 | [1] | 0 | [2]
Recorded investment | 0 | [1] | 0 | [2]
Related allowance | 0 | [1] | 0 | [2]
Troubled Debt Restructurings That Subsequently Defaulted [Member] | Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Number of contracts | 0 | [1] | 0 | [2]
Recorded investment | 0 | [1] | 0 | [2]
Related allowance | $ 0 | [1] | $ 0 | [2]
[1] | These loans were classified as TDRs during 2013.
[2] | These loans were classified as TDRs during 2012.

X
- Definition Amount of allowance related to financing receivables modified by troubled debt restructurings within the previous 12 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: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration