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Securities Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Held-to-maturity Securities [Abstract]    
Amortized cost $ 20,762,303 $ 25,251,316
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 114,000 87,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 46,000 105,000
Fair Value 20,829,978 25,233,254
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Due in one year or less 1,329,000  
Due in one year to five years 6,210,000  
Due in five to ten years 10,425,000  
Due after ten years 2,798,000  
Mortgage-backed securities 0  
Asset-backed securities 0  
Amortized cost 20,762,303 25,251,316
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less 1,330,000  
Due in one year to five years 6,200,000  
Due in five to ten years 10,469,000  
Due after ten years 2,831,000  
Mortgage-backed securities 0  
Asset-backed securities 0  
Fair Value 20,829,978 25,233,254
State And Municipal Securities    
Held-to-maturity Securities [Abstract]    
Amortized cost 20,762,000 25,251,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 114,000 87,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 46,000 105,000
Fair Value 20,830,000 25,233,000
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost 20,762,000 25,251,000
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value $ 20,830,000 $ 25,233,000