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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, 2017
Dec. 31, 2016
Investment Securities [Line Items]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 996  
Amortized Cost 794,075 $ 790,082
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 7,434 7,076
Gross Unrealized Losses (15,263) (18,546)
Securities available for sale, at fair value 786,246 778,612
Due within one year, Estimated Fair Value 997  
Due after one but within five years, Amortized Cost 14,087  
Due after one but within five years, Estimated Fair Value 14,176  
Due after five but within ten years, Amortized Cost 27,079  
Due after five but within ten years, Estimated Fair Value 27,555  
Due after ten years, Amortized Cost 42,290  
Due after ten years, Estimated Fair Value 35,975  
Due within one year, Amortized Cost 84,452  
Available-for-sale Securities, Debt Maturities, Single Maturity Date 78,703  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis [1] 707,953  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value [1] 705,873  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 13,800  
Securities available for sale, at fair value 15,184 16,617
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 690,689 676,853
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 0 1
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 1,096 16,631
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 27,555 27,229
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 16,404 6,319
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 33,648 33,292
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 792,405  
Securities available for sale, at fair value 784,576  
Equity Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 1,670 1,670
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 1,670
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 792,405 788,412
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 7,434 7,076
Gross Unrealized Losses (15,263) (18,546)
Securities available for sale, at fair value 784,576 776,942
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Amortized Cost 40,378 39,989
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 463 427
Gross Unrealized Losses (7,193) (7,124)
Securities available for sale, at fair value 33,648 33,292
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 15,899 5,903
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 505 416
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 16,404 6,319
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 27,079 27,075
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 476 195
Gross Unrealized Losses 0 (41)
Securities available for sale, at fair value 27,555 27,229
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Amortized Cost 1,096 16,700
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 0 (69)
Securities available for sale, at fair value 1,096 16,631
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]    
Investment Securities [Line Items]    
Amortized Cost 0 1
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 0 1
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 694,114 683,601
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 4,638 4,557
Gross Unrealized Losses (8,063) (11,305)
Securities available for sale, at fair value 690,689 676,853
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 13,839 15,143
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,352 1,481
Gross Unrealized Losses (7) (7)
Securities available for sale, at fair value $ 15,184 $ 16,617
[1] Mortgage-Backed Securities include an amortized cost of $13.8 million and a fair value of $15.2 million for Obligations of U.S.