XML 63 R52.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Mar. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 207 | 91
Fair Value, Less than 12 Months | $ 528,747 | $ 190,832
Unrealized Losses, Less than 12 Months | $ (8,009) | $ (2,234)
Number of positions, 12 Months or More | security | 94 | 94
Fair value, 12 Months or More | $ 174,424 | $ 183,115
Unrealized Losses, 12 Months or More | $ (10,478) | $ (8,254)
Number of positions | security | 301 | 185
Fair value | $ 703,171 | $ 373,947
Unrealized Losses | $ (18,487) | $ (10,488)
Trust preferred securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 2 | 2
Fair value, 12 Months or More | $ 10,045 | $ 9,388
Unrealized Losses, 12 Months or More | $ (2,384) | $ (3,054)
Number of positions | security | 2 | 2
Fair value | $ 10,045 | $ 9,388
Unrealized Losses | $ (2,384) | $ (3,054)
Other debt securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 7 | 2
Fair Value, Less than 12 Months | $ 6,140 | $ 756
Unrealized Losses, Less than 12 Months | $ (25) | $ (12)
Number of positions, 12 Months or More | security | 2 | 2
Fair value, 12 Months or More | $ 6,187 | $ 6,308
Unrealized Losses, 12 Months or More | $ (181) | $ (64)
Number of positions | security | 9 | 4
Fair value | $ 12,327 | $ 7,064
Unrealized Losses | $ (206) | $ (76)
Obligations of other U.S. Government agencies and corporations |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 1 | 1
Fair Value, Less than 12 Months | $ 494 | $ 497
Unrealized Losses, Less than 12 Months | $ (6) | $ (3)
Number of positions, 12 Months or More | security | 2 | 2
Fair value, 12 Months or More | $ 1,981 | $ 1,999
Unrealized Losses, 12 Months or More | $ (42) | $ (27)
Number of positions | security | 3 | 3
Fair value | $ 2,475 | $ 2,496
Unrealized Losses | $ (48) | $ (30)
Obligations of states and political subdivisions |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 52 | 23
Fair Value, Less than 12 Months | $ 31,417 | $ 11,860
Unrealized Losses, Less than 12 Months | $ (392) | $ (59)
Number of positions, 12 Months or More | security | 12 | 12
Fair value, 12 Months or More | $ 7,554 | $ 7,728
Unrealized Losses, 12 Months or More | $ (372) | $ (210)
Number of positions | security | 64 | 35
Fair value | $ 38,971 | $ 19,588
Unrealized Losses | $ (764) | $ (269)
Government agency mortgage backed securities | Residential mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 87 | 29
Fair Value, Less than 12 Months | $ 298,721 | $ 64,595
Unrealized Losses, Less than 12 Months | $ (3,942) | $ (659)
Number of positions, 12 Months or More | security | 44 | 44
Fair value, 12 Months or More | $ 84,166 | $ 89,414
Unrealized Losses, 12 Months or More | $ (3,986) | $ (2,400)
Number of positions | security | 131 | 73
Fair value | $ 382,887 | $ 154,009
Unrealized Losses | $ (7,928) | $ (3,059)
Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 7 | 2
Fair Value, Less than 12 Months | $ 8,987 | $ 5,629
Unrealized Losses, Less than 12 Months | $ (122) | $ (17)
Number of positions, 12 Months or More | security | 3 | 3
Fair value, 12 Months or More | $ 5,732 | $ 5,872
Unrealized Losses, 12 Months or More | $ (318) | $ (217)
Number of positions | security | 10 | 5
Fair value | $ 14,719 | $ 11,501
Unrealized Losses | $ (440) | $ (234)
Government agency collateralized mortgage obligations | Residential mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 51 | 33
Fair Value, Less than 12 Months | $ 173,116 | $ 102,509
Unrealized Losses, Less than 12 Months | $ (3,394) | $ (1,470)
Number of positions, 12 Months or More | security | 29 | 29
Fair value, 12 Months or More | $ 58,759 | $ 62,406
Unrealized Losses, 12 Months or More | $ (3,195) | $ (2,282)
Number of positions | security | 80 | 62
Fair value | $ 231,875 | $ 164,915
Unrealized Losses | $ (6,589) | $ (3,752)
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 2 | 1
Fair Value, Less than 12 Months | $ 9,872 | $ 4,986
Unrealized Losses, Less than 12 Months | $ (128) | $ (14)
Number of positions, 12 Months or More | security | 0 | 0
Fair value, 12 Months or More | $ 0 | $ 0
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of positions | security | 2 | 1
Fair value | $ 9,872 | $ 4,986
Unrealized Losses | $ (128) | $ (14)

X
- Definition Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer + References No definition available. + Details
Name: | rnst_DebtSecuritiesAvailableforsaleContinuousUnrealizedLossPosition12MonthsorLonger
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss + References No definition available. + Details
Name: | rnst_DebtSecuritiesAvailableforsaleContinuousUnrealizedLossPosition12MonthsorLongerAccumulatedLoss
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions + References No definition available. + Details
Name: | rnst_DebtSecuritiesAvailableforsaleContinuousUnrealizedLossPosition12MonthsorLongerNumberofPositions
Namespace Prefix: | rnst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months + References No definition available. + Details
Name: | rnst_DebtSecuritiesAvailableforsaleContinuousUnrealizedLossPositionLessthan12Months
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss + References No definition available. + Details
Name: | rnst_DebtSecuritiesAvailableforsaleContinuousUnrealizedLossPositionLessthan12MonthsAccumulatedLoss
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions + References No definition available. + Details
Name: | rnst_DebtSecuritiesAvailableforsaleContinuousUnrealizedLossPositionLessthan12MonthsNumberofPositions
Namespace Prefix: | rnst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Securities, Available-for-sale, Unrealized Loss Position + References No definition available. + Details
Name: | rnst_DebtSecuritiesAvailableforsaleUnrealizedLossPosition
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss + References No definition available. + Details
Name: | rnst_DebtSecuritiesAvailableforsaleUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions + References No definition available. + Details
Name: | rnst_DebtSecuritiesAvailableforsaleUnrealizedLossPositionNumberofPositions
Namespace Prefix: | rnst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=rnst_TrustPreferredSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=rnst_GovernmentAgencyMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |