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Condensed Financial Information (Parent Company Only) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Assets      
Cash and Cash Equivalents $ 28,197us-gaap_CashAndCashEquivalentsAtCarryingValue $ 13,137us-gaap_CashAndCashEquivalentsAtCarryingValue $ 19,144us-gaap_CashAndCashEquivalentsAtCarryingValue
Other assets 1,587us-gaap_OtherAssets 1,738us-gaap_OtherAssets  
Total assets 684,228us-gaap_Assets 631,754us-gaap_Assets  
Liabilities      
Total liabilities 608,545us-gaap_Liabilities 575,485us-gaap_Liabilities  
Stockholders' Equity 75,683us-gaap_StockholdersEquity 56,269us-gaap_StockholdersEquity 53,284us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 684,228us-gaap_LiabilitiesAndStockholdersEquity 631,754us-gaap_LiabilitiesAndStockholdersEquity  
Parent [Member]      
Assets      
Cash and Cash Equivalents 12,446us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
6,353us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
601us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Investment in common stock of banking subsidiaries 75,194us-gaap_EquityMethodInvestments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
72,391us-gaap_EquityMethodInvestments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Investment in nonbanking subsidiaries 1,401us-gaap_AdvancesToAffiliate
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
1,237us-gaap_AdvancesToAffiliate
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Other assets 152us-gaap_OtherAssets
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
270us-gaap_OtherAssets
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Total assets 89,193us-gaap_Assets
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
80,251us-gaap_Assets
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Liabilities      
Trust preferred securities 10,000rbnf_TrustPreferredSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
20,000rbnf_TrustPreferredSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Borrowings from nonbanking subsidiaries 310rbnf_BorrowingsFromNonbankingSubsidiaries
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
620rbnf_BorrowingsFromNonbankingSubsidiaries
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Other liabilities & accrued interest payable 3,200us-gaap_OtherAccountsPayableAndAccruedLiabilities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
3,362us-gaap_OtherAccountsPayableAndAccruedLiabilities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Total liabilities 13,510us-gaap_Liabilities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
23,982us-gaap_Liabilities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Stockholders' Equity 75,683us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
56,269us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Total liabilities and stockholders' equity $ 89,193us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
$ 80,251us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember