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Investment Securities - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Jun. 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 872,153 $ 740,846
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,573 4,854
Gross Unrealized Losses (23,483) (14,342)
Securities available for sale, at fair value 851,243 731,358
Due within one year, Estimated Fair Value 4,078  
Due after one but within five years, Amortized Cost 15,728  
Due after one but within five years, Estimated Fair Value 15,443  
Due after five but within ten years, Amortized Cost 26,339  
Due after five but within ten years, Estimated Fair Value 26,416  
Due after ten years, Amortized Cost 1,923  
Due after ten years, Estimated Fair Value 2,420  
Due within one year, Amortized Cost 48,089  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 48,357  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [1] 822,394  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [1] 801,216  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 131,700  
Securities available for sale, at fair value 130,400  
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 670,752 625,555
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 27,168 27,410
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 21,089 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 870,483  
Securities available for sale, at fair value 849,573  
US Government Agency Debt Securities Commercial [Domain]    
Investment Securities [Line Items]    
Amortized Cost 121,996 24,611
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 36 0
Gross Unrealized Losses (1,747) (462)
Securities available for sale, at fair value 120,285 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 870,483 739,176
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,573 4,854
Gross Unrealized Losses (23,483) (14,342)
Securities available for sale, at fair value 849,573 729,688
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 20,902 15,907
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 497 590
Gross Unrealized Losses (310) (4)
Securities available for sale, at fair value 21,089 16,493
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 27,087 27,083
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 120 327
Gross Unrealized Losses (39) 0
Securities available for sale, at fair value 27,168 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 690,692 632,422
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,344 2,622
Gross Unrealized Losses (21,284) (9,489)
Securities available for sale, at fair value 670,752 625,555
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 9,706 10,556
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 576 789
Gross Unrealized Losses (103) (7)
Securities available for sale, at fair value $ 10,179 $ 11,338
[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.