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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, 2016
Dec. 31, 2015
Investment Securities [Line Items]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 5,600  
Amortized Cost 805,116 $ 891,111
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 17,187 11,926
Gross Unrealized Losses (8,644) (16,477)
Securities available for sale, at fair value 813,659 886,560
Due within one year, Estimated Fair Value 5,602  
Due after one but within five years, Amortized Cost 17,697  
Due after one but within five years, Estimated Fair Value 17,756  
Due after five but within ten years, Amortized Cost 27,073  
Due after five but within ten years, Estimated Fair Value 27,951  
Due after ten years, Amortized Cost 44,924  
Due after ten years, Estimated Fair Value 38,077  
Due within one year, Amortized Cost 95,294  
Available-for-sale Securities, Debt Maturities, Single Maturity Date 89,386  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis [1] 708,152  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value [1] 722,603  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 16,059  
Securities available for sale, at fair value 17,976 22,092
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 704,626 777,577
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 1 28
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 19,307 19,118
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 27,951 27,598
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 6,519 2,319
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 35,609 35,658
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 803,446  
Securities available for sale, at fair value 811,989  
Equity Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 1,670 2,170
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 1,670 2,170
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 803,446 888,941
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 17,187 11,926
Gross Unrealized Losses (8,644) (16,477)
Securities available for sale, at fair value 811,989 884,390
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Amortized Cost 43,020 42,239
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 677 916
Gross Unrealized Losses (8,088) (7,497)
Securities available for sale, at fair value 35,609 35,658
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 5,901 1,897
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 618 422
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 6,519 2,319
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 27,073 27,066
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 878 532
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 27,951 27,598
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Amortized Cost 19,300 19,201
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 7 2
Gross Unrealized Losses 0 (85)
Securities available for sale, at fair value 19,307 19,118
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]    
Investment Securities [Line Items]    
Amortized Cost 1 28
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 1 28
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 692,092 778,476
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 13,090 7,983
Gross Unrealized Losses 556 (8,882)
Securities available for sale, at fair value 704,626 777,577
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 16,059 20,034
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,917 2,071
Gross Unrealized Losses 0 (13)
Securities available for sale, at fair value $ 17,976 $ 22,092
[1] Mortgage Backed Securities include an amortized cost of $16.1 million and a fair value of $18.0 million for Obligations of U.S.