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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, 2019
Dec. 31, 2018
Investment Securities [Line Items]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost $ 630  
Amortized Cost 861,812 $ 924,054
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 8,204 2,998
Gross Unrealized Losses (4,113) (17,805)
Securities available for sale, at fair value 865,903 909,247
Due within one year, Estimated Fair Value 631  
Due after one but within five years, Amortized Cost 32,735  
Due after one but within five years, Estimated Fair Value 33,334  
Due after five but within ten years, Amortized Cost 26,206  
Due after five but within ten years, Estimated Fair Value 26,861  
Due after ten years, Amortized Cost 0  
Due after ten years, Estimated Fair Value 0  
Due within one year, Amortized Cost 59,571  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 60,826  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [1] 802,241  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [1] 805,077  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 177,000  
Securities available for sale, at fair value 179,500  
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 625,579 673,361
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 10,003 10,012
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 26,889 27,712
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 23,934 21,012
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 861,812  
Securities available for sale, at fair value 865,903  
US Government Agency Debt Securities Commercial [Domain]    
Investment Securities [Line Items]    
Amortized Cost 168,626 169,633
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,121 214
Gross Unrealized Losses (202) (2,103)
Securities available for sale, at fair value 170,545 167,744
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 22,908 20,912
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,026 321
Gross Unrealized Losses 0 (221)
Securities available for sale, at fair value 23,934 21,012
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 26,663 27,592
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 226 126
Gross Unrealized Losses 0 (6)
Securities available for sale, at fair value 26,889 27,712
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Amortized Cost 10,000 10,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3 12
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 10,003 10,012
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 625,242 686,906
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4,248 1,846
Gross Unrealized Losses (3,911) (15,391)
Securities available for sale, at fair value 625,579 673,361
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 8,373 9,011
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 580 479
Gross Unrealized Losses 0 (84)
Securities available for sale, at fair value $ 8,953 $ 9,406
[1] Mortgage-Backed Securities include an amortized cost of $177.0 million and a fair value of $179.5 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $625.2 million and a fair value of $625.6 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.