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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Net Investment Income [Line Items]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 34,462  
Due after five but within ten years, Amortized Cost 3,739  
Due after one but within five years, Amortized Cost 23,978  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [1] 838,330  
Due within one year, Amortized Cost 32,715  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost 4,998  
Due after ten years, Amortized Cost 0  
Corporate/Mortgage-Backed Securities, Amortized cost [1] 867,678  
Amortized Cost 871,045 $ 896,495
Due within one year, Estimated Fair Value 5,070  
Due after one but within five years, Estimated Fair Value 25,071  
Due after five but within ten years, Estimated Fair Value 4,321  
Due after ten years, Estimated Fair Value 0  
Securities available for sale, at fair value 902,140 902,292
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 31,113 8,906
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 18 3,109
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Net Investment Income [Line Items]    
Amortized Cost 605,400  
Securities available for sale, at fair value 624,200  
Debt Securities [Member]    
Net Investment Income [Line Items]    
Amortized Cost 871,045  
Securities available for sale, at fair value 902,140  
Corporate Debt Securities [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 24,477 23,962
Obligations of States and Political Subdivisions [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 8,984 17,909
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 1,001 1,000
Residential Mortgage Backed Securities [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 624,155 $ 661,947
US Government Agencies Debt Securities [Member]    
Net Investment Income [Line Items]    
Amortized Cost 232,900  
Securities available for sale, at fair value $ 243,500  
[1] Mortgage-Backed Securities include an amortized cost of $232.9 million and a fair value of $243.5 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $605.4 million and a fair value of $624.2 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.