Financial Instruments with Off-Balance-Sheet Risk	12 Months Ended
Dec. 31, 2017
Risks and Uncertainties [Abstract]
Financial Instruments with Off-Balance-Sheet Risk	The Corporation is a party to financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments consist primarily of commitments to extend credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the balance sheet. The contract or notional amounts of those instruments reflect the extent of involvement the Corporation has in particular classes of financial instruments. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee by the customer. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Corporation evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral, if any, deemed necessary by the Corporation upon extension of credit is based on management’s credit evaluation of the counterparty. Collateral normally consists of real property, liquid assets or business assets. The Corporation had approximately $82.8 million and $25.1 million in outstanding commitments at December 31, 2017 and 2016, respectively. The Corporation’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit is represented by the contractual notional amount of those instruments. The Corporation uses the same credit policies in making commitments and conditional obligations as it does for on-balance-sheet instruments. The Corporation had approximately $468.2 million and $330.0 million in unfunded lines of credit whose contract amounts represent credit risk at December 31, 2017 and 2016, respectively. Standby letters of credit are conditional commitments issued by the Corporation to guarantee the performance of a customer to a third party. Those letters of credit are primarily issued to support public and private borrowing arrangements. Essentially all letters of credit issued have expiration dates within one year. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The Corporation generally holds collateral supporting those commitments if deemed necessary. The Corporation had standby letters of credit outstanding in the amount of $14.3 million and $9.6 million at December 31, 2017 and 2016, respectively. The Bank has a letter of credit agreement with the Commonwealth of Virginia Treasury Board pertaining to its public deposits program. Under the terms of the letters of credit agreement, the Commonwealth of Virginia Treasury Board in accordance with the Security for Public Deposits Act has approved the use of a letter of credit issued by the FHLB as collateral by the Bank. The maximum amount available under the letter of credit is $65 million. The letter of credit expired in August 2017 with an automatic one-year extension until August 2018. In addition to the above, the Corporation is subject to risks related to the mortgage origination operations of the Mortgage Division of the Bank. See Note 8 for a discussion of those risks.

The Corporation is a party to financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments consist primarily of commitments to extend credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the balance sheet. The contract or notional amounts of those instruments reflect the extent of involvement the Corporation has in particular classes of financial instruments.

Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee by the customer. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Corporation evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral, if any, deemed necessary by the Corporation upon extension of credit is based on management’s credit evaluation of the counterparty. Collateral normally consists of real property, liquid assets or business assets. The Corporation had approximately $82.8 million and $25.1 million in outstanding commitments at December 31, 2017 and 2016, respectively.

The Corporation’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit is represented by the contractual notional amount of those instruments. The Corporation uses the same credit policies in making commitments and conditional obligations as it does for on-balance-sheet instruments. The Corporation had approximately $468.2 million and $330.0 million in unfunded lines of credit whose contract amounts represent credit risk at December 31, 2017 and 2016, respectively.

Standby letters of credit are conditional commitments issued by the Corporation to guarantee the performance of a customer to a third party. Those letters of credit are primarily issued to support public and private borrowing arrangements. Essentially all letters of credit issued have expiration dates within one year. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The Corporation generally holds collateral supporting those commitments if deemed necessary. The Corporation had standby letters of credit outstanding in the amount of $14.3 million and $9.6 million at December 31, 2017 and 2016, respectively.

The Bank has a letter of credit agreement with the Commonwealth of Virginia Treasury Board pertaining to its public deposits program. Under the terms of the letters of credit agreement, the Commonwealth of Virginia Treasury Board in accordance with the Security for Public Deposits Act has approved the use of a letter of credit issued by the FHLB as collateral by the Bank. The maximum amount available under the letter of credit is $65 million. The letter of credit expired in August 2017 with an automatic one-year extension until August 2018.

In addition to the above, the Corporation is subject to risks related to the mortgage origination operations of the Mortgage Division of the Bank. See Note 8 for a discussion of those risks.