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Investment Securities - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Sep. 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 $ 1,527  
Amortized Cost 805,149 $ 924,054
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 9,830 2,998
Gross Unrealized Losses (2,596) (17,805)
Securities available for sale, at fair value 812,383 909,247
Due within one year, Estimated Fair Value 1,531  
Due after one but within five years, Amortized Cost 36,106  
Due after one but within five years, Estimated Fair Value 36,779  
Due after five but within ten years, Amortized Cost 8,240  
Due after five but within ten years, Estimated Fair Value 8,891  
Due after ten years, Amortized Cost 0  
Due after ten years, Estimated Fair Value 0  
Due within one year, Amortized Cost 45,873  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 47,201  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [1] 759,276  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [1] 765,182  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 176,100  
Securities available for sale, at fair value 180,400  
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 584,824 673,361
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 998 10,012
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 22,168 27,712
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 24,035 21,012
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 805,149  
Securities available for sale, at fair value 812,383  
US Government Agency Debt Securities Commercial [Domain]    
Investment Securities [Line Items]    
Amortized Cost 168,006 169,633
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3,585 214
Gross Unrealized Losses 0 (2,103)
Securities available for sale, at fair value 171,591 167,744
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 22,914 20,912
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,121 321
Gross Unrealized Losses 0 (221)
Securities available for sale, at fair value 24,035 21,012
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 21,959 27,592
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 209 126
Gross Unrealized Losses 0 (6)
Securities available for sale, at fair value 22,168 27,712
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Amortized Cost 1,000 10,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 12
Gross Unrealized Losses (2) 0
Securities available for sale, at fair value 998 10,012
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 583,158 686,906
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4,260 1,846
Gross Unrealized Losses (2,594) (15,391)
Securities available for sale, at fair value 584,824 673,361
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 8,112 9,011
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 655 479
Gross Unrealized Losses 0 (84)
Securities available for sale, at fair value $ 8,767 $ 9,406
[1] Mortgage-Backed Securities include an amortized cost of $176.1 million and a fair value of $180.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $583.2 million and a fair value of $584.8 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.