ACCOUNTING POLICIES (Policies)	9 Months Ended
Sep. 30, 2019
ACCOUNTING POLICIES [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers Southern National records revenue from contracts with customers in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 606, Revenue from Contracts with Customers (Topic 606). Under Topic 606, we must identify the contract with a customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract, and recognize revenue when (or as) we satisfy a performance obligation. Significant revenue has not been recognized in the current reporting period that results from performance obligations satisfied in previous periods. Our primary sources of revenue are derived from financial instruments, namely loans, investment securities, and other financial instruments that are not within the scope of Topic 606. We have evaluated the nature of the Company’s contracts with customers and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Consolidated Statements of Income and Comprehensive Income was not necessary. Southern National generally fully satisfies its performance obligations on its contracts with customers as services are rendered and the transaction prices are typically fixed; charged either on a periodic basis or based on activity. Because performance obligations are satisfied as services are rendered and the transaction prices are fixed, there is little judgment involved in applying Topic 606 that significantly affects the determination of the amount and timing of revenue from contracts with customers.
Operating Leases	Operating Leases The Company leases certain properties and equipment under operating leases. For leases in effect upon adoption of FASB Accounting Standards Update (ASU) 2016-02, Leases (Topic 842) at January 1, 2019 and for any leases commencing thereafter, the Company recognizes a liability to make lease payments, the operating lease liability, and an asset representing the right to use the underlying asset during the lease term, the right-of-use asset. The operating lease liability is measured at the present value of the remaining lease payments, discounted at the Company’s incremental borrowing rate at inception. The right-of-use asset is measured at the amount of the operating lease liability adjusted for the remaining balance of any lease incentives received, any cumulative prepaid or accrued rent if the lease payments are uneven throughout the lease term, any unamortized initial direct costs, and any impairment of the right-of-use-asset. Lease expense consists of a single lease cost calculated so that the remaining cost of the lease is allocated over the remaining lease term on a straight-line basis, variable lease payments not included in the operating lease liability, and any impairment of the right-of-use asset. Certain of the Company’s leases contain options to renew the lease; however, these renewal options are not included in the calculation of the operating lease liabilities as they are not reasonably certain to be exercised. The Company’s leases do not contain residual value guarantees or material variable lease payments. The Company does not have any material restrictions or covenants imposed by leases that would impact the Company’s ability to pay dividends or cause the Company to incur additional financial obligations. The Company has made an accounting policy election to not apply the recognition requirements in Topic 842 to short-term leases. The Company has also elected to use the practical expedient to make an accounting policy election for property leases to use the discount rates in effect on January 2, 2019 for the remaining life of the leases.
Use of Estimates	Use of Estimates The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses, the carrying value of investment securities, other than temporary impairment of investment securities and the valuation of goodwill and intangible assets.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adoption of New Accounting Standards: In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The FASB issued this ASU to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet by lessees for those leases classified as operating leases under current U.S. GAAP and disclosing key information about leasing arrangements. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases, which updates narrow aspects of the guidance issued in ASU 2016-02. The amendments in this ASU were effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Early adoption of this ASU was permitted for all entities. The Company adopted ASU 2016-02 in the first quarter of 2019 and inventoried and categorized its lease agreements. Upon adoption, the Company recognized right-of-use assets and associated operating lease liabilities of $8.6 million and $9.1 million, respectively. Right-of-use assets and operating lease liabilities are reflected on our consolidated balance sheets. The company currently does not have any finance leases. See Note 5 – Leases for additional disclosures related to leases. In March 2017, the FASB issued ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities, which shortens the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. ASU 2017-08 became effective for public entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The company adopted ASU 2017-08 in the first quarter of 2019 and it did not have a material impact on the Company’s consolidated financial statements. In July 2018, the FASB issued ASU 2018-09, Codification Improvements. This ASU makes changes to a variety of topics to clarify, correct errors in, or make minor improvements to the Accounting Standards Codification. The majority of the amendments in ASU 2018-09 were effective for the Company for fiscal years beginning after December 15, 2018. The Company adopted ASU 2018-09 in the first quarter of 2019 and it did not have a material impact on the Company’s consolidated financial statements. New Accounting Standards Not Yet Adopted: In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which sets forth a “current expected credit loss” ("CECL") model requiring the Company to measure all expected credit losses for financial instruments held at the reporting date based on historical experience, current conditions and reasonable supportable forecasts. This replaces the existing incurred loss model and is applicable to the measurement of credit losses on financial assets measured at amortized cost and applies to some off-balance sheet credit exposures. For public business entities that are U.S. Securities and Exchange Commission filers, the amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Southern National engaged a third-party to collect data that was needed to produce historical inputs into any models created as a result of adopting this ASU. We are in the process of validating our models. We are currently evaluating the impact of the adoption of this ASU on our consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which eliminates the second step of the previous FASB guidance for testing goodwill for impairment and is intended to reduce cost and complexity of goodwill impairment testing. The amendments in this ASU modify the concept of impairment from the condition that exists when the carrying amount of goodwill exceeds its implied fair value to the condition that exists when the carrying amount of a reporting unit exceeds its fair value. After determining if the carrying amount of a reporting unit exceeds its fair value, the entity should take an impairment charge of the same amount to the goodwill for that reporting unit, not to exceed the total goodwill amount for that reporting unit. ASU 2017-04 is effective for annual periods beginning after December 15, 2019, including interim periods within those annual periods. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. Southern National is currently evaluating the impact of adopting the new guidance on its consolidated financial statements. In August 2018, FASB issued ASU 2018-13, Fair Value measurement (Topic 820). This ASU adds, eliminates and modifies certain disclosure requirements for fair value measurements. The amendments in ASU 2018-13 are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The disclosures are effective using the prospective method for certain disclosures and retrospective for a majority of the disclosures. Southern National is currently in the process of evaluating the impact of adopting the new guidance on its consolidated financial statements and disclosures.

ACCOUNTING POLICIES (Policies)

9 Months Ended

Sep. 30, 2019

Southern National records revenue from contracts with customers in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 606, Revenue from Contracts with Customers (Topic 606). Under Topic 606, we must identify the contract with a customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract, and recognize revenue when (or as) we satisfy a performance obligation. Significant revenue has not been recognized in the current reporting period that results from performance obligations satisfied in previous periods.

Our primary sources of revenue are derived from financial instruments, namely loans, investment securities, and other financial instruments that are not within the scope of Topic 606. We have evaluated the nature of the Company’s contracts with customers and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Consolidated Statements of Income and Comprehensive Income was not necessary. Southern National generally fully satisfies its performance obligations on its contracts with customers as services are rendered and the transaction prices are typically fixed; charged either on a periodic basis or based on activity. Because performance obligations are satisfied as services are rendered and the transaction prices are fixed, there is little

judgment involved in applying Topic 606 that significantly affects the determination of the amount and timing of revenue from contracts with customers.

Operating Leases

Operating Leases

The Company leases certain properties and equipment under operating leases. For leases in effect upon adoption of FASB Accounting Standards Update (ASU) 2016-02, Leases (Topic 842) at January 1, 2019 and for any leases commencing thereafter, the Company recognizes a liability to make lease payments, the operating lease liability, and an asset representing the right to use the underlying asset during the lease term, the right-of-use asset. The operating lease liability is measured at the present value of the remaining lease payments, discounted at the Company’s incremental borrowing rate at inception. The right-of-use asset is measured at the amount of the operating lease liability adjusted for the remaining balance of any lease incentives received, any cumulative prepaid or accrued rent if the lease payments are uneven throughout the lease term, any unamortized initial direct costs, and any impairment of the right-of-use-asset. Lease expense consists of a single lease cost calculated so that the remaining cost of the lease is allocated over the remaining lease term on a straight-line basis, variable lease payments not included in the operating lease liability, and any impairment of the right-of-use asset.

Certain of the Company’s leases contain options to renew the lease; however, these renewal options are not included in the calculation of the operating lease liabilities as they are not reasonably certain to be exercised. The Company’s leases do not contain residual value guarantees or material variable lease payments. The Company does not have any material restrictions or covenants imposed by leases that would impact the Company’s ability to pay dividends or cause the Company to incur additional financial obligations.

The Company has made an accounting policy election to not apply the recognition requirements in Topic 842 to short-term leases. The Company has also elected to use the practical expedient to make an accounting policy election for property leases to use the discount rates in effect on January 2, 2019 for the remaining life of the leases.

Use of Estimates

The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses, the carrying value of investment securities, other than temporary impairment of investment securities and the valuation of goodwill and intangible assets.

Recent Accounting Pronouncements

Adoption of New Accounting Standards:

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The FASB issued this ASU to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet by lessees for those leases classified as operating leases under current U.S. GAAP and disclosing key information about leasing arrangements. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases, which updates narrow aspects of the guidance issued in ASU 2016-02. The amendments in this ASU were effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Early adoption of this ASU was permitted for all entities. The Company adopted ASU 2016-02 in the first quarter of 2019 and inventoried and categorized its lease agreements. Upon adoption, the Company recognized right-of-use assets and associated operating lease liabilities of $8.6 million and $9.1 million, respectively. Right-of-use assets and operating lease liabilities are reflected on our consolidated balance sheets. The company currently does not have any finance leases. See Note 5 – Leases for additional disclosures related to leases.

In March 2017, the FASB issued ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities, which shortens the amortization period for certain

callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. ASU 2017-08 became effective for public entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The company adopted ASU 2017-08 in the first quarter of 2019 and it did not have a material impact on the Company’s consolidated financial statements.

In July 2018, the FASB issued ASU 2018-09, Codification Improvements. This ASU makes changes to a variety of topics to clarify, correct errors in, or make minor improvements to the Accounting Standards Codification. The majority of the amendments in ASU 2018-09 were effective for the Company for fiscal years beginning after December 15, 2018. The Company adopted ASU 2018-09 in the first quarter of 2019 and it did not have a material impact on the Company’s consolidated financial statements.

New Accounting Standards Not Yet Adopted:

In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which sets forth a “current expected credit loss” ("CECL") model requiring the Company to measure all expected credit losses for financial instruments held at the reporting date based on historical experience, current conditions and reasonable supportable forecasts. This replaces the existing incurred loss model and is applicable to the measurement of credit losses on financial assets measured at amortized cost and applies to some off-balance sheet credit exposures. For public business entities that are U.S. Securities and Exchange Commission filers, the amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Southern National engaged a third-party to collect data that was needed to produce historical inputs into any models created as a result of adopting this ASU. We are in the process of validating our models. We are currently evaluating the impact of the adoption of this ASU on our consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which eliminates the second step of the previous FASB guidance for testing goodwill for impairment and is intended to reduce cost and complexity of goodwill impairment testing. The amendments in this ASU modify the concept of impairment from the condition that exists when the carrying amount of goodwill exceeds its implied fair value to the condition that exists when the carrying amount of a reporting unit exceeds its fair value. After determining if the carrying amount of a reporting unit exceeds its fair value, the entity should take an impairment charge of the same amount to the goodwill for that reporting unit, not to exceed the total goodwill amount for that reporting unit. ASU 2017-04 is effective for annual periods beginning after December 15, 2019, including interim periods within those annual periods. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. Southern National is currently evaluating the impact of adopting the new guidance on its consolidated financial statements.

In August 2018, FASB issued ASU 2018-13, Fair Value measurement (Topic 820). This ASU adds, eliminates and modifies certain disclosure requirements for fair value measurements. The amendments in ASU 2018-13 are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The disclosures are effective using the prospective method for certain disclosures and retrospective for a majority of the disclosures. Southern National is currently in the process of evaluating the impact of adopting the new guidance on its consolidated financial statements and disclosures.