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Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
 [1]
Amortized Cost    
Due within one year $ 1,585  
Due after one year through five years 7,629  
Due after five years through ten years 13,832  
Due after ten years 83,151  
Amortized Cost 106,197  
Fair Value    
Due within one year 1,596  
Due after one year through five years 7,532  
Due after five years through ten years 13,318  
Due after ten years 80,302  
Fair Value 102,748 $ 89,255
Amortized Cost    
Due within one year 629  
Due after one year through five years 6,772  
Due after five years through ten years 13,560  
Due after ten years 23,278  
Amortized Cost 44,239 48,208
Fair Value    
Due within one year 630  
Due after one year through five years 6,607  
Due after five years through ten years 13,228  
Due after ten years 22,242  
Fair Value $ 42,707 $ 47,702
[1] Derived from audited consolidated financial statements.