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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, 2017
Dec. 31, 2016
Investment Securities [Line Items]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 997  
Amortized Cost 784,875 $ 790,082
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 7,051 7,076
Gross Unrealized Losses (13,282) (18,546)
Securities available for sale, at fair value 778,644 778,612
Due within one year, Estimated Fair Value 997  
Due after one but within five years, Amortized Cost 14,088  
Due after one but within five years, Estimated Fair Value 14,214  
Due after five but within ten years, Amortized Cost 27,081  
Due after five but within ten years, Estimated Fair Value 27,515  
Due after ten years, Amortized Cost 42,509  
Due after ten years, Estimated Fair Value 37,092  
Due within one year, Amortized Cost 84,675  
Available-for-sale Securities, Debt Maturities, Single Maturity Date 79,818  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis [1] 698,530  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value [1] 697,156  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 35,700  
Securities available for sale, at fair value 36,385  
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 660,771 676,853
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 1,097 16,631
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 27,514 27,229
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 16,578 6,319
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 34,629 33,292
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 783,205  
Securities available for sale, at fair value 776,974  
US Government Agency Debt Securities Commercial [Domain]    
Investment Securities [Line Items]    
Amortized Cost 24,684 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses (217) 0
Securities available for sale, at fair value 24,467 0
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 783,205 788,412
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 7,051 7,076
Gross Unrealized Losses (13,282) (18,546)
Securities available for sale, at fair value 776,974 776,942
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Amortized Cost 40,594 39,989
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 516 427
Gross Unrealized Losses (6,481) (7,124)
Securities available for sale, at fair value 34,629 33,292
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 15,903 5,903
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 675 416
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 16,578 6,319
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 27,081 27,075
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 433 195
Gross Unrealized Losses 0 (41)
Securities available for sale, at fair value 27,514 27,229
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Amortized Cost 1,097 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 1,097 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 662,858 683,601
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 4,497 4,557
Gross Unrealized Losses (6,584) (11,305)
Securities available for sale, at fair value 660,771 676,853
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 10,988 15,143
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 930 1,481
Gross Unrealized Losses 0 (7)
Securities available for sale, at fair value $ 11,918 $ 16,617
[1] Mortgage-Backed Securities include an amortized cost of $35.7 million and a fair value of $36.4 million for Obligations of U.S.