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Loans - Analysis Of Loan Transactions (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Loans and Leases Receivable, Related Parties [Roll Forward]    
Balance, beginning of the year $ 2,336nrim_AnalysisOfLoanTransactions $ 373nrim_AnalysisOfLoanTransactions
Loans made 0nrim_AnalysisOfLoanTransactionsLoansMade 2,439nrim_AnalysisOfLoanTransactionsLoansMade
Repayments 74nrim_AnalysisOfLoanTransactionsRepaymentOfLoans 476nrim_AnalysisOfLoanTransactionsRepaymentOfLoans
Balance, end of year $ 2,262nrim_AnalysisOfLoanTransactions $ 2,336nrim_AnalysisOfLoanTransactions