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Investments (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Amortized Cost: Due in one year or less $ 231  
Amortized Cost: Due after one year through five years 16,083  
Amortized Cost: Due after five years through ten years 22,840  
Amortized Cost: Due after ten years 29,412  
Amortized Cost: Sub Total 68,566  
Fair Value: Due in one year or less 234  
Fair Value: Due after one year through five years 15,629  
Fair Value: Due after five years through ten years 21,676  
Fair Value: Due after ten years 27,353  
Available For Sale Debt Maturities Fair Value Sub Total 64,892  
Available-for-sale Securities, Amortized Cost Basis 145,899 $ 153,552
Available-for-sale Securities 138,645 146,470
Amortized Cost: Due after five years through ten years, Held to maturity 15,982  
Amortized Cost: Due after ten years, Held to maturity 9,630  
Amortized Cost: Total, Held to maturity 25,612  
Fair Value: Due after five years through ten years, Held to maturity 15,822  
Fair Value: Due after ten years, Held to maturity 10,452  
Fair Value: Total, Held to maturity 26,274  
Held-to-maturity securities 93,726 93,632
Held-to-maturity securities, fair value 91,896 95,346
Residential mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Held-to-maturity securities 47,776 47,771
Held-to-maturity securities, fair value 45,884 47,442
Commercial mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 39,433 41,771
Available-for-sale Securities 37,631 40,891
Held-to-maturity securities 16,569 17,288
Held-to-maturity securities, fair value 16,229 17,518
Collateralized mortgage obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 37,900 41,298
Available-for-sale Securities 36,122 40,384
Held-to-maturity securities 3,769 4,187
Held-to-maturity securities, fair value $ 3,509 $ 4,118