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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Net Investment Income [Line Items]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 47,201  
Due after five but within ten years, Amortized Cost 8,240  
Due after one but within five years, Amortized Cost 36,106  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [1] 759,276  
Due within one year, Amortized Cost 45,873  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost 1,527  
Due after ten years, Amortized Cost 0  
Corporate/Mortgage-Backed Securities, Amortized cost [1] 765,182  
Amortized Cost 805,149 $ 924,054
Due within one year, Estimated Fair Value 1,531  
Due after one but within five years, Estimated Fair Value 36,779  
Due after five but within ten years, Estimated Fair Value 8,891  
Due after ten years, Estimated Fair Value 0  
Securities available for sale, at fair value 812,383 909,247
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 9,830 2,998
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,596 17,805
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Net Investment Income [Line Items]    
Amortized Cost 583,200  
Securities available for sale, at fair value 584,800  
Debt Securities [Member]    
Net Investment Income [Line Items]    
Amortized Cost 805,149  
Securities available for sale, at fair value 812,383  
Corporate Debt Securities [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 24,035 21,012
Obligations of States and Political Subdivisions [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 22,168 27,712
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 998 10,012
Residential Mortgage Backed Securities [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 584,824 $ 673,361
US Government Agencies Debt Securities [Member]    
Net Investment Income [Line Items]    
Amortized Cost 176,100  
Securities available for sale, at fair value $ 180,400  
[1] Mortgage-Backed Securities include an amortized cost of $176.1 million and a fair value of $180.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $583.2 million and a fair value of $584.8 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.