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Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Amortized Cost    
Due within one year $ 2,102  
Due after one year through five years 5,777  
Due after five years through ten years 13,602  
Due after ten years 80,666  
Amortized Cost 102,147 $ 90,594
Fair Value    
Due within one year 2,112  
Due after one year through five years 5,715  
Due after five years through ten years 13,266  
Due after ten years 78,764  
Fair Value 99,857 89,255
Amortized Cost    
Due within one year 627  
Due after one year through five years 6,768  
Due after five years through ten years 13,523  
Due after ten years 22,490  
Amortized Cost 43,408 48,208
Fair Value    
Due within one year 629  
Due after one year through five years 6,644  
Due after five years through ten years 13,379  
Due after ten years 21,742  
Fair Value $ 42,394 $ 47,702