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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, 2020
Dec. 31, 2019
Investment Securities [Line Items]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost $ 4,998  
Amortized Cost 871,045 $ 896,495
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 31,113 8,906
Gross Unrealized Losses (18) (3,109)
Securities available for sale, at fair value 902,140 902,292
Due within one year, Estimated Fair Value 5,070  
Due after one but within five years, Amortized Cost 23,978  
Due after one but within five years, Estimated Fair Value 25,071  
Due after five but within ten years, Amortized Cost 3,739  
Due after five but within ten years, Estimated Fair Value 4,321  
Due after ten years, Amortized Cost 0  
Due after ten years, Estimated Fair Value 0  
Due within one year, Amortized Cost 32,715  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 34,462  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [1] 838,330  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [1] 867,678  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 232,900  
Securities available for sale, at fair value 243,500  
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 624,155 661,947
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 1,001 1,000
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 8,984 17,909
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 24,477 23,962
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 871,045  
Securities available for sale, at fair value 902,140  
US Government Agency Debt Securities Commercial [Domain]    
Investment Securities [Line Items]    
Amortized Cost 225,662 186,316
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 9,932 2,983
Gross Unrealized Losses 0 (166)
Securities available for sale, at fair value 235,594 189,133
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 22,930 22,919
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,547 1,043
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 24,477 23,962
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 8,785 17,738
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 199 171
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 8,984 17,909
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Amortized Cost 1,000 1,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1 0
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 1,001 1,000
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 605,469 660,777
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 18,704 4,113
Gross Unrealized Losses (18) (2,943)
Securities available for sale, at fair value 624,155 661,947
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 7,199 7,745
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 730 596
Gross Unrealized Losses 0 0
Securities available for sale, at fair value $ 7,929 $ 8,341
[1] Mortgage-Backed Securities include an amortized cost of $232.9 million and a fair value of $243.5 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $605.4 million and a fair value of $624.2 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.