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Investment Securities - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Investment Securities [Line Items]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost $ 4,099  
Amortized Cost 915,350 $ 740,846
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,000 4,854
Gross Unrealized Losses (28,294) (14,342)
Securities available for sale, at fair value 889,056 731,358
Due within one year, Estimated Fair Value 4,089  
Due after one but within five years, Amortized Cost 15,730  
Due after one but within five years, Estimated Fair Value 15,464  
Due after five but within ten years, Amortized Cost 26,342  
Due after five but within ten years, Estimated Fair Value 26,269  
Due after ten years, Amortized Cost 2,426  
Due after ten years, Estimated Fair Value 2,896  
Due within one year, Amortized Cost 48,597  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 48,718  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [1] 865,083  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [1] 838,668  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 179,400  
Securities available for sale, at fair value 177,000  
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 661,629 625,555
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 100 1,097
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 27,517 27,410
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 21,101 16,493
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value   23,646
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 913,680  
Securities available for sale, at fair value 887,386  
US Government Agency Debt Securities Commercial [Domain]    
Investment Securities [Line Items]    
Amortized Cost 170,086 24,611
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses (2,675) (462)
Securities available for sale, at fair value 167,411 24,149
Equity Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 1,670 1,670
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 1,670 1,670
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 913,680 739,176
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,000 4,854
Gross Unrealized Losses (28,294) (14,342)
Securities available for sale, at fair value 887,386 729,688
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Amortized Cost 0 27,499
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 526
Gross Unrealized Losses 0 (4,379)
Securities available for sale, at fair value 0 23,646
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 20,907 15,907
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 473 590
Gross Unrealized Losses (279) (4)
Securities available for sale, at fair value 21,101 16,493
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 27,590 27,083
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 56 327
Gross Unrealized Losses (129) 0
Securities available for sale, at fair value 27,517 27,410
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Amortized Cost 100 1,098
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 0 (1)
Securities available for sale, at fair value 100 1,097
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 685,721 632,422
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 987 2,622
Gross Unrealized Losses (25,079) (9,489)
Securities available for sale, at fair value 661,629 625,555
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 9,276 10,556
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 484 789
Gross Unrealized Losses (132) (7)
Securities available for sale, at fair value $ 9,628 $ 11,338
[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.