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Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Amortized Cost    
Due within one year $ 1,952  
Due after one year through five years 13,828  
Due after five years through ten years 12,689  
Due after ten years 65,015  
Corporate equity securities 1  
Amortized Cost 93,485 $ 96,106
Fair Value    
Due within one year 1,968  
Due after one year through five years 13,909  
Due after five years through ten years 12,652  
Due after ten years 64,558  
Corporate equity securities 15  
Fair Value 93,102 94,802 [1]
Amortized Cost    
Due within one year 0  
Due after one year through five years 6,190  
Due after five years through ten years 14,198  
Due after ten years 28,988  
Corporate equity securities 0  
Amortized Cost 49,376 53,398 [1]
Fair Value    
Due within one year 0  
Due after one year through five years 6,228  
Due after five years through ten years 14,342  
Due after ten years 28,846  
Corporate equity securities 0  
Fair Value $ 49,416 $ 52,709 [1]
[1] Derived from audited consolidated financial statements.