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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Net Investment Income [Line Items]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 48,357  
Due after five but within ten years, Amortized Cost 26,339  
Due after one but within five years, Amortized Cost 15,728  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [1] 822,394  
Due within one year, Amortized Cost 48,089  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost 4,099  
Due after ten years, Amortized Cost 1,923  
Corporate/Mortgage-Backed Securities, Amortized cost [1] 801,216  
Amortized Cost 872,153 $ 740,846
Due within one year, Estimated Fair Value 4,078  
Due after one but within five years, Estimated Fair Value 15,443  
Due after five but within ten years, Estimated Fair Value 26,416  
Due after ten years, Estimated Fair Value 2,420  
Securities available for sale, at fair value 851,243 731,358
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,573 4,854
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 23,483 14,342
Debt Securities [Member]    
Net Investment Income [Line Items]    
Amortized Cost 870,483 739,176
Securities available for sale, at fair value 849,573 729,688
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,573 4,854
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 23,483 14,342
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Net Investment Income [Line Items]    
Amortized Cost 690,700  
Securities available for sale, at fair value 670,800  
Debt Securities [Member]    
Net Investment Income [Line Items]    
Amortized Cost 870,483  
Securities available for sale, at fair value 849,573  
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 21,089 16,493
Obligations of States and Political Subdivisions [Member]    
Net Investment Income [Line Items]    
Securities available for sale, at fair value 27,168 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 670,752 $ 625,555
US Government Agencies Debt Securities [Member]    
Net Investment Income [Line Items]    
Amortized Cost 131,700  
Securities available for sale, at fair value $ 130,400  
[1] Mortgage-Backed Securities include an amortized cost of $131.7 million and a fair value of $130.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $690.7 million and a fair value of $670.8 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.