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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Net Investment Income [Line Items]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 48,718  
Due after five but within ten years, Amortized Cost 26,342  
Due after one but within five years, Amortized Cost 15,730  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [1] 865,083  
Due within one year, Amortized Cost 48,597  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost 4,099  
Due after ten years, Amortized Cost 2,426  
Corporate/Mortgage-Backed Securities, Amortized cost [1] 838,668  
Amortized Cost 915,350 $ 740,846
Due within one year, Estimated Fair Value 4,089  
Due after one but within five years, Estimated Fair Value 15,464  
Due after five but within ten years, Estimated Fair Value 26,269  
Due after ten years, Estimated Fair Value 2,896  
Securities available for sale, at fair value 889,056 731,358
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,000 4,854
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 28,294 14,342
Debt Securities [Member]    
Net Investment Income [Line Items]    
Amortized Cost 913,680 739,176
Securities available for sale, at fair value 887,386 729,688
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,000 4,854
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 28,294 14,342
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Net Investment Income [Line Items]    
Amortized Cost 685,700  
Securities available for sale, at fair value 661,600  
Debt Securities [Member]    
Net Investment Income [Line Items]    
Amortized Cost 913,680  
Securities available for sale, at fair value 887,386  
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value   23,646
Corporate Debt Securities [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 21,101 16,493
Obligations of States and Political Subdivisions [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 27,517 27,410
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 100 1,097
Residential Mortgage Backed Securities [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 661,629 $ 625,555
US Government Agencies Debt Securities [Member]    
Net Investment Income [Line Items]    
Amortized Cost 179,400  
Securities available for sale, at fair value $ 177,000  
[1] Mortgage-Backed Securities include an amortized cost of $179.4 million and a fair value of $177.0 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $685.7 million and a fair value of $661.6 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.