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Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Amortized Cost    
Due within one year $ 600  
Due after one year through five years 9,040  
Due after five years through ten years 8,920  
Due after ten years 72,034  
Amortized Cost 90,594 $ 96,106
Fair Value    
Due within one year 601  
Due after one year through five years 9,048  
Due after five years through ten years 8,774  
Due after ten years 70,832  
Fair Value 89,255 94,802
Amortized Cost    
Due within one year 0  
Due after one year through five years 6,186  
Due after five years through ten years 14,160  
Due after ten years 27,862  
Amortized Cost 48,208 53,398
Fair Value    
Due within one year 0  
Due after one year through five years 6,144  
Due after five years through ten years 14,158  
Due after ten years 27,400  
Fair Value $ 47,702 $ 52,709