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Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Available for Sale Amortized Cost      
1 year or less $ 10,050    
Over 1 year through 5 years 121,477    
Over 5 years through 10 years 3,886    
Over 10 years 0    
Total amortized cost 167,089 $ 160,290  
Available for Sale Fair Value      
1 year or less 10,013    
Over 1 year through 5 years 118,020    
Over 5 years through 10 years 3,833    
Over 10 years 0    
Total securities available for sale 162,957 159,051  
Held-to-Maturity Amortized Cost      
1 year or less 6,000    
Over 1 year through 5 years 6,000    
Over 5 years through 10 years 0    
Over 10 years 0    
Total amortized costs 33,517 44,829 $ 47,369
Held-to-Maturity Fair Value      
1 year or less 5,980    
Over 1 year through 5 years 5,903    
Over 5 years through 10 years 0    
Over 10 years 0    
Securities held to maturity, fair value 32,767 44,549 $ 47,373
Mortgage-backed securities, residential      
Available for Sale Amortized Cost      
Without single maturity date 31,676    
Total amortized cost 31,676 34,473  
Available for Sale Fair Value      
Without single maturity date 31,091    
Total securities available for sale 31,091 34,833  
Held-to-Maturity Amortized Cost      
Without single maturity date 21,517    
Total amortized costs 21,517 25,829  
Held-to-Maturity Fair Value      
Without single maturity date 20,884    
Securities held to maturity, fair value $ 20,884 $ 25,646