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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) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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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 | $ 252,025 | $ 108,316
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 | 252,025 |
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 | 246,806 |
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 | 5,219 |
Past due loans of 90 days or more | 0 |
Nonaccrual loans | $ 0 |

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

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- References No definition available. + Details
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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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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- Details
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