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Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Amortized Cost    
Due within one year $ 1,959  
Due after one year through five years 14,050  
Due after five years through ten years 11,412  
Due after ten years 62,466  
Corporate equity securities 1  
Amortized Cost 89,888 $ 96,106
Fair Value    
Due within one year 1,981  
Due after one year through five years 14,136  
Due after five years through ten years 11,404  
Due after ten years 62,208  
Corporate equity securities 12  
Fair Value 89,741 94,802 [1]
Amortized Cost    
Due within one year 0  
Due after one year through five years 6,195  
Due after five years through ten years 14,343  
Due after ten years 30,286  
Corporate equity securities 0  
Amortized Cost 50,824 53,398 [1]
Fair Value    
Due within one year 0  
Due after one year through five years 6,257  
Due after five years through ten years 14,549  
Due after ten years 30,195  
Corporate equity securities 0  
Fair Value $ 51,001 $ 52,709 [1]
[1] Derived from audited consolidated financial statements.