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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Amortized cost    
Due in one year or less $ 14,962  
Due after one year through five years 19,750  
Due after five years through ten years 0  
Due after ten years 507  
Mortgage and asset-backed securities 190,610  
Amortized cost 225,829 $ 154,652
Fair value    
Due in one year or less 14,946  
Due after one year through five years 19,638  
Due after five years through ten years 0  
Due after ten years 477  
Mortgage and asset-backed securities 188,816  
Fair value $ 223,877 $ 153,509