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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 ($)
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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

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- 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. + References No definition available. + Details
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