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Business Segments (Schedule Of Segment Reporting Information, By Segment) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Net interest income $ 6,130,000 $ 5,331,000  
Provision for loan losses 210,000 22,000 $ 716,000
Net interest income after provision for loan losses 5,920,000 5,309,000  
Noninterest income 1,219,000 1,186,000  
Noninterest expenses 5,599,000 5,097,000  
Income before income taxes 1,540,000 1,398,000  
Income tax expense 306,000 275,000  
Net Income 1,234,000 1,123,000  
Total assets 684,388,000 653,635,000 $ 674,897,000
Community Banking [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net interest income 6,130,000 5,331,000  
Provision for loan losses 210,000 22,000  
Net interest income after provision for loan losses 5,920,000 5,309,000  
Noninterest income 528,000 566,000  
Noninterest expenses 5,025,000 4,604,000  
Income before income taxes 1,423,000 1,271,000  
Income tax expense 281,000 248,000  
Net Income 1,142,000 1,023,000  
Total assets 681,531,000 650,068,000  
Mortgage [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Noninterest income 691,000 620,000  
Noninterest expenses 574,000 493,000  
Income before income taxes 117,000 127,000  
Income tax expense 25,000 27,000  
Net Income 92,000 100,000  
Total assets $ 2,857,000 $ 3,567,000