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Summary of Significant Accounting Policies - Narrative (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
Accounting Policies [Line Items]    
Number of operating segments | segment 1  
Number of reportable segments | segment 1  
Total assets of NER 16-1 VIE included in consolidated financial statements $ 65,500,000  
Total liabilities of NER 16-1 VIE included in consolidated financial statements 55,300,000  
Restricted cash balance 6,700,000  
Minimum nonaccrual loan relationships $ 500,000  
Depreciation method used straight line method  
Cumulative effect adjustment to retained earnings, net of income tax effect   $ 437,000
Buildings and improvements | Minimum    
Accounting Policies [Line Items]    
Estimated useful life 10 years  
Buildings and improvements | Maximum    
Accounting Policies [Line Items]    
Estimated useful life 40 years  
Land improvements    
Accounting Policies [Line Items]    
Estimated useful life 10 years  
Furniture and equipment | Minimum    
Accounting Policies [Line Items]    
Estimated useful life 3 years  
Furniture and equipment | Maximum    
Accounting Policies [Line Items]    
Estimated useful life 10 years  
Four Oaks FinCorp, Inc    
Accounting Policies [Line Items]    
Loans received through acquisition   $ 4,610,000
Credit Concentration Risk    
Accounting Policies [Line Items]    
Concentration risk, percentage 74.00%