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Investment Securities (Available for Sale by Contractual Maturity) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized cost $ 1,067,874 $ 965,135
Fair value 1,100,391 $ 976,919
Available-for-sale Securities    
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost 0  
Due after one year through five years, amortized cost 5,679  
Due after five years through ten years, amortized cost 38,089  
Due after ten years, amortized cost 66,379  
Amortized cost 110,147  
Due in one year or less, fair value 0  
Due after one year through five years, fair value 5,792  
Due after five years through ten years, fair value 38,737  
Due after ten years, fair value 66,739  
Fair value $ 111,268