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Disclosures About Fair Value of Assets and Liabilities, Quantitative Information (Details) - Nonrecurring Basis [Member] $ in Thousands | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements [Abstract] |  |
Collateral-dependent impaired loans | $ 1,919 | $ 506
Foreclosed assets held for sale | 188 | 110
Level 3 [Member] |  |
Quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements [Abstract] |  |
Collateral-dependent impaired loans | 1,919 | 506
Foreclosed assets held for sale | $ 188 | $ 110
Level 3 [Member] | Appraisals from Comparable Properties [Member] | Estimated Cost to Sell [Member] | Minimum [Member] |  |
Quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements [Abstract] |  |
Collateral-dependent impaired loans, measurement input | 0.03 | 0.07
Foreclosed assets held for sale, measurement input | 0.07 | 0.07
Level 3 [Member] | Appraisals from Comparable Properties [Member] | Estimated Cost to Sell [Member] | Maximum [Member] |  |
Quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements [Abstract] |  |
Collateral-dependent impaired loans, measurement input | 0.05 | 0.1
Foreclosed assets held for sale, measurement input | 0.1 | 0.1

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- Definition Fair value as of the balance sheet date of foreclosed assets held for sale obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + References No definition available. + Details
Name: | bsvn_ForeclosedAssetsHeldForSaleFairValueDisclosure
Namespace Prefix: | bsvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Value of input used to measure foreclosed assets held for sale. + References No definition available. + Details
Name: | bsvn_ForeclosedAssetsHeldForSaleMeasurementInput
Namespace Prefix: | bsvn_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents the fair value disclosure of collateral-dependent impaired loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date. + References No definition available. + Details
Name: | bsvn_ImpairedLoansFairValueDisclosure
Namespace Prefix: | bsvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Value of input used to measure collateral-dependent impaired loans. + References No definition available. + Details
Name: | bsvn_ImpairedLoansMeasurementInput
Namespace Prefix: | bsvn_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_FairValueInputsQuantitativeInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | srt_RangeAxis=srt_MinimumMember
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- Details
Name: | srt_RangeAxis=srt_MaximumMember
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