XML 108 R59.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Significant Accounting Policies - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2020 | Jan. 01, 2019 | Sep. 01, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Date of discontinued recognition of interest on mortgage and commercial loans | 90 days |  |  |  |  |
Consumer and other retail loan due date | 120 days |  |  |  |  |
Minimum duration for past due residential loans to be considered as nonperforming | 90 days |  |  |  |  |
Impairment of company's goodwill | $ 0 | $ 0 | $ 0 |  |  |
Lock in period for interest rates | 45 days |  |  |  |  |
Right-of-use lease asset | $ 84,754,000 |  |  |  |  |
Lease liability | $ 88,494,000 |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Right-of-use lease asset |  |  |  |  | $ 53,042,000 |
Lease liability |  |  |  |  | $ 56,562,000 |
Minimum |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Renewal term | 1 year |  |  |  |  |
Minimum | Subsequent Event | Forecast | Accounting Standards Update 2016-13 |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Allowance for credit loss |  |  |  | $ 35,000,000 |  |
Reserve for unfunded commitments |  |  |  | 10,000,000 |  |
Maximum |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Renewal term | 20 years |  |  |  |  |
Maximum | Subsequent Event | Forecast | Accounting Standards Update 2016-13 |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Allowance for credit loss |  |  |  | 45,000,000 |  |
Reserve for unfunded commitments |  |  |  | $ 15,000,000 |  |
Premises |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Estimated life (in years) | 40 years |  |  |  |  |
Furniture and equipment | Minimum |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Estimated life (in years) | 3 years |  |  |  |  |
Furniture and equipment | Maximum |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Estimated life (in years) | 7 years |  |  |  |  |
Computer equipment | Minimum |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Estimated life (in years) | 3 years |  |  |  |  |
Computer equipment | Maximum |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Estimated life (in years) | 5 years |  |  |  |  |
Brand Group Holdings, Inc. |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Cash surrender value of life insurance |  |  |  |  |  | $ 40,081,000

X
- Definition Lock in period for interest rates. + References No definition available. + Details
Name: | rnst_LockInPeriodForInterestRates
Namespace Prefix: | rnst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of days past due for discontinued recognition of interest on mortgage and commercial loans. + References No definition available. + Details
Name: | rnst_NumberOfDaysPastDueForDiscontinuedRecognitionOfInterestOnMortgageAndCommercialLoans
Namespace Prefix: | rnst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of days past due when consumer and other retail loans are charged-off. + References No definition available. + Details
Name: | rnst_NumberOfDaysPastDueWhenConsumerAndOtherRetailLoansChargedOff
Namespace Prefix: | rnst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reserve for Unfunded Commitments + References No definition available. + Details
Name: | rnst_ReserveforUnfundedCommitments
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum duration past due for restructured loans to be considered performing. + References No definition available. + Details
Name: | rnst_RestructuredLoansDiscontinuedPastDuePeriod
Namespace Prefix: | rnst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CashSurrenderValueOfLifeInsurance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
Name: | us-gaap_GoodwillImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201613Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=rnst_PremisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=rnst_FurnitureAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=rnst_BrandGroupHoldingsInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |