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Investment Securities - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Investment Securities [Line Items]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost $ 5,597  
Amortized Cost 947,345 $ 896,495
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 25,496 8,906
Gross Unrealized Losses (215) (3,109)
Securities available for sale, at fair value 972,626 902,292
Due within one year, Estimated Fair Value 5,601  
Due after one but within five years, Amortized Cost 23,248  
Due after one but within five years, Estimated Fair Value 23,536  
Due after five but within ten years, Amortized Cost 4,970  
Due after five but within ten years, Estimated Fair Value 5,392  
Due after ten years, Amortized Cost 0  
Due after ten years, Estimated Fair Value 0  
Due within one year, Amortized Cost 33,815  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 34,529  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [1] 913,530  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [1] 938,097  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 243,300  
Securities available for sale, at fair value 248,900  
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 689,224 661,947
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 1,004 1,000
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 10,027 17,909
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 23,498 23,962
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 947,345  
Securities available for sale, at fair value 972,626  
US Government Agency Debt Securities Commercial [Domain]    
Investment Securities [Line Items]    
Amortized Cost 235,884 186,316
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,088 2,983
Gross Unrealized Losses (215) (166)
Securities available for sale, at fair value 240,757 189,133
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 22,924 22,919
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 574 1,043
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 23,498 23,962
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 9,891 17,738
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 136 171
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 10,027 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 4 0
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 1,004 1,000
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 670,251 660,777
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 18,973 4,113
Gross Unrealized Losses 0 (2,943)
Securities available for sale, at fair value 689,224 661,947
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 7,395 7,745
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 721 596
Gross Unrealized Losses 0 0
Securities available for sale, at fair value $ 8,116 $ 8,341
[1] Mortgage-Backed Securities include an amortized cost of $243.3 million and a fair value of $248.9 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $670.3 million and a fair value of $689.2 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.