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Commitments, Contingencies, and Concentrations of Credit Risk (Schedule of Maximum Credit Risk for Securities) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Fannie Mae - mortgage-backed securities [Member]
Amortized cost, Available for sale and held to maturity	$ 154,606
Fair value, Available for sale and held to maturity	153,561
Freddie Mac - mortgage-backed securities [Member]
Amortized cost, Available for sale and held to maturity	107,712
Fair value, Available for sale and held to maturity	106,722
Ginnie Mae - mortgage-backed securities [Member]
Amortized cost, Available for sale and held to maturity	63,812
Fair value, Available for sale and held to maturity	63,030
Small Business Administration securities [Member]
Amortized cost, Available for sale and held to maturity	34,821
Fair value, Available for sale and held to maturity	34,378
Federal Home Loan Bank of Atlanta - common stock [Member]
Amortized cost, Available for sale and held to maturity	19,647
Fair value, Available for sale and held to maturity	19,647
Federal Reserve Bank - Common [Stock Member]
Amortized cost, Available for sale and held to maturity	11,691
Fair value, Available for sale and held to maturity	11,691
Bank Of America Corporate Bond [Member]
Amortized cost, Available for sale and held to maturity	7,000
Fair value, Available for sale and held to maturity	7,153
Federal Home Loan Bank System - bonds [Member]
Amortized cost, Available for sale and held to maturity	6,500
Fair value, Available for sale and held to maturity	6,440
Citigroup, Inc. corporate bond [Member]
Amortized cost, Available for sale and held to maturity	6,035
Fair value, Available for sale and held to maturity	6,096
North Carolina State municipal bonds [Member]
Amortized cost, Available for sale and held to maturity	5,589
Fair value, Available for sale and held to maturity	5,608
Goldman Sachs Group Inc. corporate bond [Member]
Amortized cost, Available for sale and held to maturity	5,090
Fair value, Available for sale and held to maturity	5,132
JP Morgan Chase corporate bond [Member]
Amortized cost, Available for sale and held to maturity	5,022
Fair value, Available for sale and held to maturity	5,075
Fannie Mae - bond [Member]
Amortized cost, Available for sale and held to maturity	5,000
Fair value, Available for sale and held to maturity	4,945
Financial Institutions, Inc. corporate bond [Member]
Amortized cost, Available for sale and held to maturity	4,000
Fair value, Available for sale and held to maturity	4,175
Spartanburg, South Carolina Sanitary Sewer District municipal bond [Member]
Amortized cost, Available for sale and held to maturity	3,851
Fair value, Available for sale and held to maturity	3,982
Craven County, North Carolina municipal bond [Member]
Amortized cost, Available for sale and held to maturity	3,532
Fair value, Available for sale and held to maturity	3,623
Wells Fargo & Company corporate bond [Member]
Amortized cost, Available for sale and held to maturity	3,096
Fair value, Available for sale and held to maturity	3,124
Eagle Bancorp corporate bond [Member]
Amortized cost, Available for sale and held to maturity	2,549
Fair value, Available for sale and held to maturity	2,500
Freddie Mac - bonds [Member]
Amortized cost, Available for sale and held to maturity	2,500
Fair value, Available for sale and held to maturity	2,482
South Carolina State municipal bond [Member]
Amortized cost, Available for sale and held to maturity	2,179
Fair value, Available for sale and held to maturity	2,312
Cary, North Carolina municipal bonds [Member]
Amortized cost, Available for sale and held to maturity	2,023
Fair value, Available for sale and held to maturity	2,049
Virginia State Housing Authority municipal bond [Member]
Amortized cost, Available for sale and held to maturity	2,003
Fair value, Available for sale and held to maturity	$ 2,010

X

- Definition

This item represents the cost of debt and equity securities, available for sale and held to maturity, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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