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Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
 [1]
Amortized Cost    
Due within one year $ 507  
Due after one year through five years 8,965  
Due after five years through ten years 12,112  
Due after ten years 74,545  
Amortized Cost 96,129  
Fair Value    
Due within one year 514  
Due after one year through five years 8,877  
Due after five years through ten years 11,721  
Due after ten years 72,587  
Fair Value 93,699 $ 89,255
Amortized Cost    
Due within one year 0  
Due after one year through five years 6,808  
Due after five years through ten years 13,723  
Due after ten years 26,260  
Amortized Cost 46,791 48,208
Fair Value    
Due within one year 0  
Due after one year through five years 6,681  
Due after five years through ten years 13,534  
Due after ten years 25,415  
Fair Value $ 45,630 $ 47,702
[1] Derived from audited consolidated financial statements.