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Securities - Continuous Unrealized Loss Position - Additional information (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
Schedule Of Available For Sale Securities    
Securities held to maturity, fair value | $ $ 1,769 $ 1,735
Gross Unrealized Losses | $   26
Securities of U.S. government and federal agencies    
Schedule Of Available For Sale Securities    
Securities held to maturity, fair value | $ $ 1,500 1,477
Gross Unrealized Losses | $   $ 20
Securities of U.S. government and federal agencies | Held-to-maturity    
Schedule Of Available For Sale Securities    
Number of investment securities 1  
Securities of state and local municipalities    
Schedule Of Available For Sale Securities    
Number of investment securities 9  
Securities of state and local municipalities | AA+    
Schedule Of Available For Sale Securities    
Number of investment securities 5  
Securities of state and local municipalities | AA-    
Schedule Of Available For Sale Securities    
Number of investment securities 1  
Securities of state and local municipalities | AA    
Schedule Of Available For Sale Securities    
Number of investment securities 1  
Securities of state and local municipalities | No rating    
Schedule Of Available For Sale Securities    
Number of investment securities 2  
Corporate bonds | A-    
Schedule Of Available For Sale Securities    
Number of investment securities 1  
Mortgage-backed securities    
Schedule Of Available For Sale Securities    
Number of investment securities 42