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Other Real Estate Owned ("OREO") (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Additions of underlying property $ 3,215,000 $ 101,000 $ 307,000
Fair value of foreclosed real estate, additions   3,800,000  
Disposals of underlying property (316,000)   (1,005,000)
Proceeds from the disposal of commercial property 326,000    
Gain on disposal of commercial property 10,000    
Disposals   0  
Losses (gains) on dispositions (10,000)    
Valuation allowance 61,000 $ 90,000 532,000
Carrying value of impaired loans with formal foreclosure proceedings in process 0   0
Commercial Real Estate [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Additions of underlying property     142,000
Proceeds from sale of OREO     807,000
Gains (losses) on sale of OREO     4,000
Development Project [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Additions of underlying property     165,000
One Residential Property And Three Residential Lots [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Bank provided financing $ 280,000    
Residential Lots [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Proceeds from sale of OREO     190,000
Gains (losses) on sale of OREO     $ 12,000