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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, 2016
Dec. 31, 2015
Investment Securities [Line Items]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 2,601  
Amortized Cost 846,039 $ 891,111
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 19,055 11,926
Gross Unrealized Losses (9,761) (16,477)
Securities available for sale, at fair value 855,333 886,560
Due within one year, Estimated Fair Value 2,602  
Due after one but within five years, Amortized Cost 20,696  
Due after one but within five years, Estimated Fair Value 20,780  
Due after five but within ten years, Amortized Cost 27,070  
Due after five but within ten years, Estimated Fair Value 28,036  
Due after ten years, Amortized Cost 44,652  
Due after ten years, Estimated Fair Value 36,085  
Due within one year, Amortized Cost 95,019  
Available-for-sale Securities, Debt Maturities, Single Maturity Date 87,503  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis [1] 749,350  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value [1] 766,160  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 16,730  
Securities available for sale, at fair value 18,762 22,092
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 747,396 777,577
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 2 28
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 19,322 19,118
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 28,036 27,598
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 6,422 2,319
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 33,723 35,658
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 844,369  
Securities available for sale, at fair value 853,663  
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 844,369 888,941
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 19,055 11,926
Gross Unrealized Losses (9,761) (16,477)
Securities available for sale, at fair value 853,663 884,390
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Amortized Cost 42,750 42,239
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 500 916
Gross Unrealized Losses (9,527) (7,497)
Securities available for sale, at fair value 33,723 35,658
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 5,898 1,897
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 524 422
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 6,422 2,319
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 27,071 27,066
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 965 532
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 28,036 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 22 2
Gross Unrealized Losses 0 (85)
Securities available for sale, at fair value 19,322 19,118
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]    
Investment Securities [Line Items]    
Amortized Cost 2 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 2 28
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 732,618 778,476
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 15,012 7,983
Gross Unrealized Losses 234 (8,882)
Securities available for sale, at fair value 747,396 777,577
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 16,730 20,034
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,032 2,071
Gross Unrealized Losses 0 (13)
Securities available for sale, at fair value $ 18,762 $ 22,092
[1] Mortgage Backed Securities include an amortized cost of $16.7 million and a fair value of $18.8 million for Obligations of U.S.