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v3.19.1

Fair Value of Assets and Liabilities (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Fair Value Measurements and Fair Value of Financial Instruments [Abstract] |  |
Number of impaired loans not requiring a valuation allowance |  | 6
Impaired Loans, Cumulative Charge-Offs | $ | $ 251 | $ 428
Number of impaired loans requiring a valuation allowance | 4 |

X
- Definition Cumulative amount of charge-offs against impaired financing receivables over their respective lives. + References No definition available. + Details
Name: | nwfl_ImpairedLoansCumulativeChargeOffs
Namespace Prefix: | nwfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of impaired loans during the period for which a valuation allowance was not required due to the estimated realizable value of the collateral exceeding the recorded investment in the loans. + References No definition available. + Details
Name: | nwfl_NumberOfImpairedLoansNotRequiringValuationAllowance
Namespace Prefix: | nwfl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of impaired loans during the period for which a valuation allowance was required. + References No definition available. + Details
Name: | nwfl_NumberOfImpairedLoansRequiringValuationAllowance
Namespace Prefix: | nwfl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration