Summary Of Significant Accounting Policies (Policy)	3 Months Ended
Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements include the accounts of Sussex Bancorp (“we,” “us,” “our” or the “company”) and our wholly owned subsidiary Sussex Bank (the “Bank”). The Bank’s wholly owned subsidiaries are SCB Investment Company, Inc., SCBNY Company, Inc., ClassicLake Enterprises, LLC, PPD Holding Company, LLC, and Tri-State Insurance Agency, Inc. (“Tri-State”), a full service insurance agency located in Sussex County, New Jersey with a satellite office located in Bergen County, New Jersey. Tri-State’s operations are considered a separate segment for financial disclosure purposes. All inter-company transactions and balances have been eliminated in consolidation. The Bank operates eleven banking offices, eight located in Sussex County, New Jersey, one located in Bergen County, New Jersey, one located in Warren County, New Jersey, and one in Queens County, New York. We are subject to the supervision and regulation of the Board of Governors of the Federal Reserve System (the “FRB”). The Bank’s deposits are insured by the Deposit Insurance Fund (“DIF”) of the FDIC up to applicable limits. The operations of the company and the Bank are subject to the supervision and regulation of the FRB, the FDIC and the New Jersey Department of Banking and Insurance (the “Department”) and the operations of Tri-State are subject to supervision and regulation by the Department. The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information. Accordingly, they do not include all of the information and footnotes required by the accounting principles generally accepted in the United States of America (“U.S. GAAP”) for full year financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included and are of a normal, recurring nature. Operating results for the three month period ended March 31, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto that are included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2016.
New Accounting Standards	New Accounting Standards In May 2014, the FASB issued an Accounting Standard Update (“ASU”) 2014-09 to amend its guidance on “Revenue from Contracts with Customers (Topic 606). The objective of the ASU is to align the recognition of revenue with the transfer of promised goods or services provided to customers in an amount that reflects the consideration which the entity expects to be entitled in exchange for those goods or services. This ASU will replace most existing revenue recognition guidance under GAAP when it becomes effective. In August 2015, the FASB issued an amendment (ASU 2015-14) which defers the effective date of this new guidance by one year. More detailed implementation guidance on Topic 606 was issued in March 2016 (ASU 2016-08), April 2016 (ASU 2016-10) May 2016 (ASU 2016-12) and December 2016 (ASU 2016-20), and the effective date and transition requirements for these ASUs are the same as the effective date and transition requirements of ASU 2014-09. The amendments in ASU 2014-09 are effective for public business entities for annual periods beginning after December 15, 2017. The Company currently believes the impact of adopting the standard, as modified and augmented by subsequently issued pronouncements, will not be material to either past or future periods as it relates to the Company's core banking revenue streams, but is still evaluating the potential impact the new standard will have on noninterest income components. In January 2016, FASB issued ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01, among other things; (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale. For public entities, the guidance is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. The Company is currently evaluating the impact of the pending adoption of the new standard on its consolidated financial statements. In February 2016, FASB issued ASU 2016-02, Leases (Topic 842). Under the new guidance, lessees will be required to recognize the following for all leases (with the exception of short-term leases) at the commencement date: (i) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (ii) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. Public business entities should apply the amendments in ASU 2016-02 for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early application is permitted for all public business entities upon issuance. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company currently expects that upon adoption of ASU 2016-02, right-of-use assets and lease liabilities will be recognized in the consolidated balance sheet in amounts that will be material; however, there will be no material impact on operations. In March 2016, FASB issued ASU 2016-09, Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. FASB issued ASU 2016-09 as part of its initiative to reduce complexity in accounting standards. The areas for simplification in this ASU 2016-09 involve several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Some of the areas for simplification apply only to nonpublic entities. For public business entities, the amendments in this update are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted for any entity in any interim or annual period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. An entity that elects early adoption must adopt all of the amendments in the same period. The Company`s adoption of the ASU did not have a significant impact on the Company`s consolidated financial statements. The effective tax rate decreased 3.8% to 29.2% from 33.0% for the quarters ended March 31, 2017 and 2016, respectively. The Company expects the annualized tax rate to be minimally impacted by the adoption of the ASU. In June, 2016, the FASB issued Accounting Standards Update 2016-13, Financial Instruments – Credit Losses (Topic 326) (the “ASU”), which introduces new guidance for the accounting for credit losses on instruments within its scope. The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. It also modifies the impairment model for available-for-sale (AFS) debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The ASU will be effective for public business entities that are SEC filers in fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. All other entities will have one additional year. Early application of the guidance will be permitted for all entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is currently evaluating the impact of the pending adoption of the new standard on its consolidated financial statements. The Company has taken steps to prepare for implementation when it becomes effective, such as changes to its current model and evaluating the potential use of outside professionals for an updated model. In August 2016, FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments (a consensus of the FASB Emerging Issues Task Force), which addresses eight classification issues related to the statement of cash flows; (i) debt prepayment or debt extinguishment costs, (ii) settlement of zero-coupon bonds, (iii) contingent consideration payments made after a business combination, (iv) proceeds from the settlement of insurance claims, (v) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, (vi) distributions received from equity method investees, (vii) beneficial interests in securitization transactions, and (viii) separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for public business entities for annual and interim periods in fiscal years beginning after December 15, 2017. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the ASU in an interim period, adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. An entity that elects early adoption must adopt all of the amendments in the same period. Entities should apply this ASU using a retrospective transition method to each period presented. If it is impracticable for an entity to apply the ASU retrospectively for some of the issues, it may apply the amendments for those issues prospectively as of the earliest date practicable. The Company's adoption of the ASU will not have a significant impact on the Company's consolidated financial statements. In January 2017, FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment (Topic 350). The main objective of this ASU is to simplify the accounting for goodwill impairment by requiring impairment charges be based upon the first step in the current two-step impairment test under Accounting Standards Codification (ASC) 350. Currently, if the fair value of a reporting unit is lower than its carrying amount (Step 1), an entity calculates any impairment charge by comparing the implied fair value of goodwill with its carrying amount (Step 2). This ASU’s objective is to simplify how all entities assess goodwill for impairment by eliminating Step 2 from the goodwill impairment test. As amended, the goodwill impairment test will consist of one step comparing the fair value of a reporting unit with its carrying amount. An entity should recognize a goodwill impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. The standard will be applied prospectively and is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company is currently evaluating the impact of the pending adoption on its consolidated financial statements. In March 2017, FASB issued ASU 2017-08, Premium Amortization on Purchased Callable Debt Securities (Subtopic 310-20). The update shortens the amortization period for premiums on purchased callable debt securities to the earliest call date. The amendment will apply only to callable debt securities with explicit, noncontingent call features that are callable at fixed prices and on preset dates, apply to all premiums on callable debt securities, regardless of how they were generated, and require companies to reset the effective yield using the payment terms of the debt security if the call option is not exercised on the earliest call date. The ASU does not require an accounting change for securities held at a discount. The discount continues to be amortized to maturity and does not apply when the investor has already incorporated prepayments into the calculation of its effective yield under other GAAP. The amendments in the ASU are effective for public business entities for fiscal years beginning after December 15, 2018, including interim periods within those years.Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company's adoption of the ASU will not have a significant impact on the Company's consolidated financial statements.

New Accounting Standards

In May 2014, the FASB issued an Accounting Standard Update (“ASU”) 2014-09 to amend its guidance on “Revenue from Contracts with Customers (Topic 606). The objective of the ASU is to align the recognition of revenue with the transfer of promised goods or services provided to customers in an amount that reflects the consideration which the entity expects to be entitled in exchange for those goods or services. This ASU will replace most existing revenue recognition guidance under GAAP when it becomes effective. In August 2015, the FASB issued an amendment (ASU 2015-14) which defers the effective date of this new guidance by one year. More detailed implementation guidance on Topic 606 was issued in March 2016 (ASU 2016-08), April 2016 (ASU 2016-10) May 2016 (ASU 2016-12) and December 2016 (ASU 2016-20), and the effective date and transition requirements for these ASUs are the same as the effective date and transition requirements of ASU 2014-09. The amendments in ASU 2014-09 are effective for public business entities for annual periods beginning after December 15, 2017. The Company currently believes the impact of adopting the standard, as modified and augmented by subsequently issued pronouncements, will not be material to either past or future periods as it relates to the Company's core banking revenue streams, but is still evaluating the potential impact the new standard will have on noninterest income components.

In January 2016, FASB issued ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01, among other things; (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale. For public entities, the guidance is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. The Company is currently evaluating the impact of the pending adoption of the new standard on its consolidated financial statements.

In February 2016, FASB issued ASU 2016-02, Leases (Topic 842). Under the new guidance, lessees will be required to recognize the following for all leases (with the exception of short-term leases) at the commencement date: (i) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (ii) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. Public business entities should apply the amendments in ASU 2016-02 for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early application is permitted for all public business entities upon issuance. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company currently expects that upon adoption of ASU 2016-02, right-of-use assets and lease liabilities will be recognized in the consolidated balance sheet in amounts that will be material; however, there will be no material impact on operations.

In March 2016, FASB issued ASU 2016-09, Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. FASB issued ASU 2016-09 as part of its initiative to reduce complexity in accounting standards. The areas for simplification in this ASU 2016-09 involve several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Some of the areas for simplification apply only to nonpublic entities. For public business entities, the amendments in this update are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted for any entity in any interim or annual period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. An entity that elects early adoption must adopt all of the amendments in the same period. The Company`s adoption of the ASU did not have a significant impact on the Company`s consolidated financial statements. The effective tax rate decreased 3.8% to 29.2% from 33.0% for the quarters ended March 31, 2017 and 2016, respectively. The Company expects the annualized tax rate to be minimally impacted by the adoption of the ASU.

In June, 2016, the FASB issued Accounting Standards Update 2016-13, Financial Instruments – Credit Losses (Topic 326) (the “ASU”), which introduces new guidance for the accounting for credit losses on instruments within its scope. The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. It also modifies the impairment model for available-for-sale (AFS) debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The ASU will be effective for public business entities that are SEC filers in fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. All other entities will have one additional year. Early application of the guidance will be permitted for all entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is currently evaluating the impact of the pending adoption of the new standard on its consolidated financial statements. The Company has taken steps to prepare for implementation when it becomes effective, such as changes to its current model and evaluating the potential use of outside professionals for an updated model.

In August 2016, FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments (a consensus of the FASB Emerging Issues Task Force), which addresses eight classification issues related to the statement of cash flows; (i) debt prepayment or debt extinguishment costs, (ii) settlement of zero-coupon bonds, (iii) contingent consideration payments made after a business combination, (iv) proceeds from the settlement of insurance claims, (v) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, (vi) distributions received from equity method investees, (vii) beneficial interests in securitization transactions, and (viii) separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for public business entities for annual and interim periods in fiscal years beginning after December 15, 2017. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the ASU in an interim period, adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. An entity that elects early adoption must adopt all of the amendments in the same period. Entities should apply this ASU using a retrospective transition method to each period presented. If it is impracticable for an entity to apply the ASU retrospectively for some of the issues, it may apply the amendments for those issues prospectively as of the earliest date practicable. The Company's adoption of the ASU will not have a significant impact on the Company's consolidated financial statements.

In January 2017, FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment (Topic 350). The main objective of this ASU is to simplify the accounting for goodwill impairment by requiring impairment charges be based upon the first step in the current two-step impairment test under Accounting Standards Codification (ASC) 350. Currently, if the fair value of a reporting unit is lower than its carrying amount (Step 1), an entity calculates any impairment charge by comparing the implied fair value of goodwill with its carrying amount (Step 2). This ASU’s objective is to simplify how all entities assess goodwill for impairment by eliminating Step 2 from the goodwill impairment test. As amended, the goodwill impairment test will consist of one step comparing the fair value of a reporting unit with its carrying amount. An entity should recognize a goodwill impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. The standard will be applied prospectively and is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company is currently evaluating the impact of the pending adoption on its consolidated financial statements.

In March 2017, FASB issued ASU 2017-08, Premium Amortization on Purchased Callable Debt Securities (Subtopic 310-20). The update shortens the amortization period for premiums on purchased callable debt securities to the earliest call date. The amendment will apply only to callable debt securities with explicit, noncontingent call features that are callable at fixed prices and on preset dates, apply to all premiums on callable debt securities, regardless of how they were generated, and require companies to reset the effective yield using the payment terms of the debt security if the call option is not exercised on the earliest call date. The ASU does not require an accounting change for securities held at a discount. The discount continues to be amortized to maturity and does not apply when the investor has already incorporated prepayments into the calculation of its effective yield under other GAAP. The amendments in the ASU are effective for public business entities for fiscal years beginning after December 15, 2018, including interim periods within those years.Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company's adoption of the ASU will not have a significant impact on the Company's consolidated financial statements.