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Investment Securities (Available for Sale by Contractual Maturity) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 1,025,030 $ 1,041,247
Securities available for sale, at fair value 1,028,305 $ 1,040,386
Available-for-sale Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, amortized cost 35,452  
Due after one year through five years, amortized cost 2,423  
Due after five years through ten years, amortized cost 20,895  
Due after ten years, amortized cost 0  
Amortized cost 58,770  
Due in one year or less, fair value 35,445  
Due after one year through five years, fair value 2,471  
Due after five years through ten years, fair value 21,379  
Due after ten years , fair value 0  
Securities available for sale, at fair value $ 59,295