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Significant Accounting Policies (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Changes in the FDIC loss-share indemnification asset |  |
Balance at January 1 | $ 7,149,000 | $ 12,516,000
Additions through acquisition | (260,000) | 2,673,000
Realized losses in excess of initial estimates on: |  |
Loans | 265,000 | 872,000
OREO | 97,000 | 362,000
Reimbursable expenses | 0 | 1,170,000
Amortization | (797,000) | (4,865,000)
Reimbursements received from the FDIC | (2,987,000) | (5,579,000)
Termination of FDIC loss share agreements | (3,467,000) | 0
Balance at December 31 | $ 0 | $ 7,149,000

X
- Definition Additional losses on other real estate owned. + References No definition available. + Details
Name: | rnst_AdditionalLossesOnOtherRealEstateOwned
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Changes in FDIC loss-share indemnification asset. + References No definition available. + Details
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Namespace Prefix: | rnst_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition FDIC Indemnification Asset Realized Losses in Excess of Initial Estimates. + References No definition available. + Details
Name: | rnst_FdicIndemnificationAssetRealizedLossesInExcessOfInitialEstimatesAbstract
Namespace Prefix: | rnst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reimbursable expenses receivable from FDIC. + References No definition available. + Details
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Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses. + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Increases to the indemnification asset due to accretion of the loan discount relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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X
- Definition Amount of increases to the indemnification asset due to acquisitions of assets relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increases to the indemnification asset due to additional estimated losses assumed by the Federal Deposit Insurance Corporation (FDIC), relating to loss sharing agreements with the FDIC. + References No definition available. + Details
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X
- Definition Amount of decreases to the indemnification asset due to cash payments received relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- Definition Amount of decreases to the indemnification asset due to disposals relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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