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Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
 [1]
Amortized Cost    
Due within one year $ 505  
Due after one year through five years 8,982  
Due after five years through ten years 14,164  
Due after ten years 85,845  
Amortized Cost 109,496  
Fair Value    
Due within one year 511  
Due after one year through five years 8,919  
Due after five years through ten years 13,723  
Due after ten years 83,554  
Fair Value 106,707 $ 89,255
Amortized Cost    
Due within one year 186  
Due after one year through five years 6,918  
Due after five years through ten years 14,282  
Due after ten years 24,315  
Amortized Cost 45,701 48,208
Fair Value    
Due within one year 186  
Due after one year through five years 6,790  
Due after five years through ten years 14,034  
Due after ten years 23,406  
Fair Value $ 44,416 $ 47,702
[1] Derived from audited consolidated financial statements.