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Securities - Realized Gains and Losses (Narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
security
Dec. 31, 2017
USD ($)
Schedule of Investments [Line Items]        
Available-for-sale securities, impairment on securities       $ 0
Realized investment gains $ 0 $ 127,000    
Available-for-sale securities pledged as collateral $ 3,800,000 $ 3,800,000   $ 20,800,000
Residential mortgage-backed securities | 2 Securities Sold        
Schedule of Investments [Line Items]        
Realized investment gains     $ 58,000  
Number of securities sold | security     2  
Available-for-sale securities, book value     $ 1,600,000  
Residential mortgage-backed securities | 3 Securities Sold        
Schedule of Investments [Line Items]        
Realized investment gains     $ 71,000  
Number of securities sold | security     3  
Available-for-sale securities, book value     $ 1,200,000  
Asset-backed securities | 2 Securities Sold        
Schedule of Investments [Line Items]        
Realized investment gains     $ 3,000  
Number of securities sold | security     2  
Available-for-sale securities, book value     $ 3,500,000  
Taxable Municipal Bonds | 1 Security Sold        
Schedule of Investments [Line Items]        
Realized investment gains     $ 38,000  
Number of securities sold | security     1  
Available-for-sale securities, book value     $ 529,000  
Nontaxable Municipal Bonds | 4 Securities Sold        
Schedule of Investments [Line Items]        
Realized investment gains     $ 15,000  
Number of securities sold | security     4  
Available-for-sale securities, book value     $ 500,000