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Investment Securities - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Investment Securities [Line Items]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 3,300  
Amortized Cost 842,333 $ 790,082
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 7,242 7,076
Gross Unrealized Losses (16,821) (18,546)
Securities available for sale, at fair value 832,754 778,612
Due within one year, Estimated Fair Value 3,294  
Due after one but within five years, Amortized Cost 27,386  
Due after one but within five years, Estimated Fair Value 27,361  
Due after five but within ten years, Amortized Cost 27,077  
Due after five but within ten years, Estimated Fair Value 27,360  
Due after ten years, Amortized Cost 42,075  
Due after ten years, Estimated Fair Value 36,097  
Due within one year, Amortized Cost 99,838  
Available-for-sale Securities, Debt Maturities, Single Maturity Date 94,112  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis [1] 740,825  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value [1] 736,972  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 14,600  
Securities available for sale, at fair value 16,018 16,617
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 720,954 676,853
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 16,642 16,631
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 27,360 27,229
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 16,369 6,319
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 33,741 33,292
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 840,663  
Securities available for sale, at fair value 831,084  
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 840,663 788,412
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 7,242 7,076
Gross Unrealized Losses (16,821) (18,546)
Securities available for sale, at fair value 831,084 776,942
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Amortized Cost 40,165 39,989
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 530 427
Gross Unrealized Losses (6,954) (7,124)
Securities available for sale, at fair value 33,741 33,292
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 15,896 5,903
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 476 416
Gross Unrealized Losses (3) 0
Securities available for sale, at fair value 16,369 6,319
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 27,077 27,075
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 283 195
Gross Unrealized Losses 0 (41)
Securities available for sale, at fair value 27,360 27,229
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Amortized Cost 16,700 16,700
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses (58) (69)
Securities available for sale, at fair value 16,642 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 726,240 683,601
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 4,513 4,557
Gross Unrealized Losses (9,799) (11,305)
Securities available for sale, at fair value 720,954 676,853
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 14,585 15,143
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,440 1,481
Gross Unrealized Losses (7) (7)
Securities available for sale, at fair value $ 16,018 $ 16,617
[1] Mortgage-Backed Securities include an amortized cost of $14.6 million and a fair value of $16.0 million for Obligations of U.S.