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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, 2019
Dec. 31, 2018
Investment Securities [Line Items]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost $ 0  
Amortized Cost 898,877 $ 924,054
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4,620 2,998
Gross Unrealized Losses (10,396) (17,805)
Securities available for sale, at fair value 893,101 909,247
Due within one year, Estimated Fair Value 0  
Due after one but within five years, Amortized Cost 27,333  
Due after one but within five years, Estimated Fair Value 27,588  
Due after five but within ten years, Amortized Cost 33,580  
Due after five but within ten years, Estimated Fair Value 34,181  
Due after ten years, Amortized Cost 0  
Due after ten years, Estimated Fair Value 0  
Due within one year, Amortized Cost 60,913  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 61,769  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [1] 837,964  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [1] 831,332  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 177,900  
Securities available for sale, at fair value 177,400  
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 653,966 673,361
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 10,006 10,012
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 28,214 27,712
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 23,549 21,012
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 898,877  
Securities available for sale, at fair value 893,101  
US Government Agency Debt Securities Commercial [Domain]    
Investment Securities [Line Items]    
Amortized Cost 169,153 169,633
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 457 214
Gross Unrealized Losses (1,490) (2,103)
Securities available for sale, at fair value 168,120 167,744
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 22,903 20,912
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 665 321
Gross Unrealized Losses (19) (221)
Securities available for sale, at fair value 23,549 21,012
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 28,010 27,592
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 204 126
Gross Unrealized Losses 0 (6)
Securities available for sale, at fair value 28,214 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 6 12
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 10,006 10,012
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 660,080 686,906
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,749 1,846
Gross Unrealized Losses (8,863) (15,391)
Securities available for sale, at fair value 653,966 673,361
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 8,731 9,011
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 539 479
Gross Unrealized Losses (24) (84)
Securities available for sale, at fair value $ 9,246 $ 9,406
[1] Mortgage-Backed Securities include an amortized cost of $177.9 million and a fair value of $177.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $660.1 million and a fair value of $654.0 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.