XML 59 R48.htm IDEA: XBRL DOCUMENT
v3.21.2

Non Purchased Loans - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 USD ($) loan | Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 USD ($) loan | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |
Outstanding balance of restructured loans | $ 9,976,888,000 |  | $ 9,976,888,000 |  |  | $ 10,757,503,000 |  |
Allowance for loan losses attributable to restructured loans | 172,354,000 | $ 145,387,000 | $ 172,354,000 | $ 145,387,000 | $ 173,106,000 | $ 176,144,000 | $ 120,185,000 | $ 52,162,000
Non purchased loans and leases |  |  |  |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |
Mortgage and commercial loans discontinued past due period |  |  | 90 days |  |  |  |  |
Consumer and other retail loans charged-off past due period |  |  | 120 days |  |  |  |  |
Nonperforming loans charged-off past due period |  |  | 90 days |  |  |  |  |
Number of restructured loans | loan |  |  | 0 | 3 |  |  |  |
Restructured loans discontinued past due period |  |  | 90 days | 90 days |  |  |  |
Troubled debt restructured that has subsequently defaulted |  |  | $ 0 | $ 84,000 |  |  |  |
Remaining availability under commitments to lend additional funds on restructured loans | $ 305,000 | $ 0 | $ 305,000 | $ 0 |  |  |  |
Number of loan modifications | loan | 15 | 21 | 19 | 26 |  |  |  |
Modified loans, balance | $ 6,599,000 | $ 5,627,000 | $ 7,868,000 | $ 6,971,000 |  |  |  |
Non purchased loans and leases | Loan deferral | Loan Deferral Program, CARES Act |  |  |  |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |
Initial deferral period |  | 90 days |  |  |  |  |  |
Second deferral period |  | 90 days |  |  |  |  |  |
Number of loan modifications | loan |  |  | 108 |  |  |  |  |
Modified loans, balance |  |  | $ 18,300,000 |  |  |  |  |
Non purchased loans and leases | Nonaccruing Loans |  |  |  |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |
Outstanding balance of restructured loans |  | $ 352,000 |  | 352,000 |  |  |  |
Non purchased loans and leases | Restructured loans |  |  |  |  |  |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |  |  |  |  |  |
Outstanding balance of restructured loans | 11,241,000 | 2,306,000 | 11,241,000 | 2,306,000 |  |  |  |
Allowance for loan losses attributable to restructured loans | $ 612,000 | $ 299,000 | $ 612,000 | $ 299,000 |  |  |  |

X
- Definition Consumer and other retail loans charged off past due period. + References No definition available. + Details
Name: | rnst_ConsumerAndOtherRetailLoansChargedOffPastDuePeriod
Namespace Prefix: | rnst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Deferral Period + References No definition available. + Details
Name: | rnst_FinancingReceivableDeferralPeriod
Namespace Prefix: | rnst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Second Deferral Period + References No definition available. + Details
Name: | rnst_FinancingReceivableSecondDeferralPeriod
Namespace Prefix: | rnst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans and the allowance for loan losses. + References No definition available. + Details
Name: | rnst_LoansAndAllowanceForLoanLossesAdditionalTextualAbstract
Namespace Prefix: | rnst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Mortgage and commercial loans discontinued past due period. + References No definition available. + Details
Name: | rnst_MortgageAndCommercialLoansDiscontinuedPastDuePeriod
Namespace Prefix: | rnst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nonperforming loans charged off past due period. + References No definition available. + Details
Name: | rnst_NonperformingLoansChargedOffPastDuePeriod
Namespace Prefix: | rnst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Restructured Loans + References No definition available. + Details
Name: | rnst_NumberofRestructuredLoans
Namespace Prefix: | rnst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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 financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: 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=124255206&loc=SL82895884-210446 Reference 4: 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=124255953&loc=SL82919249-210447 Reference 5: 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=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554 + Details
Name: | us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=rnst_LoanPortfolioNonPurchasedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationNameAxis=rnst_LoanDeferralProgramCARESActMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rnst_NonaccruingLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rnst_RestructuredLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |