XML 177 R156.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Restrictions on Cash, Securities, Bank Dividends, Loans or Advances (Details) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | ---
Restrictions on Cash, Bank Dividends, Loans or Advances (Textual) [Abstract] |  |
Reserve requirements with federal reserve | $ 129,429,000 | $ 109,044,000
FHLB stock | 15,070,000 | 9,589,000
FHLB required investment amount | 7,181,000 | $ 7,611,000
Amount transferable loans maximum | $ 105,075,000 |
Regulatory restrictions on payments of dividends, excess surplus ratio | 10 |
Company borrowings | $ 0 |

X
- Definition Amount transferable loans maximum. + References No definition available. + Details
Name: | rnst_AmountTransferableLoansMaximum
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Federal Home Loan Bank Stock, Required Investment Amount + References No definition available. + Details
Name: | rnst_FederalHomeLoanBankStockRequiredInvestmentAmount
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Inter company borrowed funds. + References No definition available. + Details
Name: | rnst_InterCompanyBorrowedFunds
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Regulatory Restrictions on Payment of Dividends, Excess Surplus, Ratio + References No definition available. + Details
Name: | rnst_RegulatoryRestrictionsonPaymentofDividendsExcessSurplusRatio
Namespace Prefix: | rnst_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reserve requirements with federal reserve. + References No definition available. + Details
Name: | rnst_ReserveRequirementsWithFederalReserve
Namespace Prefix: | rnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restrictions On Cash Bank Dividends Loans Or Advances (Textual) [Abstract] + References No definition available. + Details
Name: | rnst_RestrictionsOnCashBankDividendsLoansOrAdvancesTextualAbstract
Namespace Prefix: | rnst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
Name: | us-gaap_FederalHomeLoanBankStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant