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Disclosure - Basic and diluted net income per common share calculations follows: (Details) Sheet http://nwp.com/role/BasicAndDilutedNetIncomePerCommonShareCalculationsFollowsDetails Basic and diluted net income per common share calculations follows: (Details) Details 32 false false R33.htm 00000033 - Disclosure - The Bank???s actual capital amounts and ratios are presented in the following table as of March 31, 2021 and December 31, 2020, respectively. 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Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay (Details) Details 37 false false R38.htm 00000038 - Disclosure - Loans receivable outstanding as of March 31, 2021 and December 31, 2020 are summarized as follows: (Details) Sheet http://nwp.com/role/LoansReceivableOutstandingAsOfMarch312021AndDecember312020AreSummarizedAsFollowsDetails Loans receivable outstanding as of March 31, 2021 and December 31, 2020 are summarized as follows: (Details) Details 38 false false R39.htm 00000039 - Disclosure - Loans receivable on nonaccrual status as of March 31, 2021 and December 31, 2020 are summarized as follows: (Details) Sheet http://nwp.com/role/LoansReceivableOnNonaccrualStatusAsOfMarch312021AndDecember312020AreSummarizedAsFollowsDetails Loans receivable on nonaccrual status as of March 31, 2021 and December 31, 2020 are summarized as follows: (Details) Details 39 false false R40.htm 00000040 - Disclosure - The following table presents information concerning the Company???s investment in loans considered impaired as of March 31, 2021 and December 31, 2020: (Details) Sheet http://nwp.com/role/FollowingTablePresentsInformationConcerningCompanysInvestmentInLoansConsideredImpairedAsOfMarch312021AndDecember312020Details The following table presents information concerning the Company???s investment in loans considered impaired as of March 31, 2021 and December 31, 2020: (Details) Details 40 false false R41.htm 00000041 - Disclosure - An age analysis of past due loans receivable as of March 31, 2021 and December 31, 2020 is below. At March 31, 2021 and December 31, 2020, there were no loans over 90 days past due that were accruing. (Details) Sheet http://nwp.com/role/AgeAnalysisOfPastDueLoansReceivableAsOfMarch312021AndDecember312020IsBelow.AtMarch312021AndDecember312020ThereWereNoLoansOver90DaysPastDueThatWereAccruing.Details An age analysis of past due loans receivable as of March 31, 2021 and December 31, 2020 is below. At March 31, 2021 and December 31, 2020, there were no loans over 90 days past due that were accruing. 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