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Fair Value Measurements - Summarizes Differences Between Fair Value and Principal Balance for Mortgage Loans Held for Sale Measure at Fair Value (Details) $ in Thousands | Mar. 31, 2018 USD ($)
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Aggregate Fair Value |
Summarizes differences between fair value and principal balance for mortgage loans held for sale measure at fair value |
Mortgage loans held for sale measured at fair value | $ 204,472
Past due loans of 90 days or more | 0
Nonaccrual loans | 0
Aggregate Unpaid Principal Balance |
Summarizes differences between fair value and principal balance for mortgage loans held for sale measure at fair value |
Mortgage loans held for sale measured at fair value | 199,539
Past due loans of 90 days or more | 0
Nonaccrual loans | 0
Difference |
Summarizes differences between fair value and principal balance for mortgage loans held for sale measure at fair value |
Mortgage loans held for sale measured at fair value | 4,933
Past due loans of 90 days or more | 0
Nonaccrual loans | $ 0

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- Definition Nonaccrual loans. + References No definition available. + Details
Name: | rnst_NonaccrualLoans
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates. + References No definition available. + Details
Name: | us-gaap_LoansPayableFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value portion of mortgage loans held-for-sale. + References No definition available. + Details
Name: | us-gaap_MortgagesHeldForSaleFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_ChangeDuringPeriodFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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