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Loans and allowance for credit losses (Details 3) (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 | 4
Premodification outstanding recorded investment | $ 0 | $ 648
Postmodification outstanding recorded investment | 0 | 659
Related allowance | 0 | 0
Troubled Debt Restructurings [Member] | Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Number of contracts | 0 | 2
Premodification outstanding recorded investment | 0 | 123
Postmodification outstanding recorded investment | 0 | 123
Related allowance | 0 | 0
Troubled Debt Restructurings [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Number of contracts | 0 | 2
Premodification outstanding recorded investment | 0 | 525
Postmodification outstanding recorded investment | 0 | 536
Related allowance | 0 | 0
Troubled Debt Restructurings [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Number of contracts | 0 | 0
Premodification outstanding recorded investment | 0 | 0
Postmodification outstanding recorded investment | 0 | 0
Related allowance | 0 | 0
Troubled Debt Restructurings [Member] | Commercial Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Number of contracts | 0 | 0
Premodification outstanding recorded investment | 0 | 0
Postmodification outstanding recorded investment | 0 | 0
Related allowance | 0 | 0
Troubled Debt Restructurings [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Number of contracts | 0 | 0
Premodification outstanding recorded investment | 0 | 0
Postmodification outstanding recorded investment | 0 | 0
Related allowance | $ 0 | $ 0

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- Definition Amount of allowance in financing receivables modified by troubled debt restructurings within the previous 9 months. + References No definition available. + Details
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Namespace Prefix: | shbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration