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Securities - Schedule of Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Total available-for-sale securities, One Year or less $ 9,308  
Total available-for-sale securities, One to Five Years 54,379  
Total available-for-sale securities, Five to Ten Years 74,972  
Total available-for-sale securities, After Ten Years 34,738  
Total available-for-sale securities, Mortgage-backed and Equity 1,074,619  
Available-for-sale, Estimated Fair Value 1,248,016 $ 1,403,069
Total held-to-maturity securities, One Year or less 355  
Total held-to-maturity securities, One to Five Years 53,448  
Total held-to-maturity securities, Five to Ten Years 415,837  
Total held-to-maturity securities, After Ten Years 367,585  
Total held-to-maturity securities, Mortgage-backed and Equity 207,419  
Held-to-maturity securities, Fair value 1,044,644 1,038,207
Total securities, One Year or less 9,663  
Total securities, One to Five Years 107,827  
Total securities, Five to Ten Years 490,809  
Total securities, After Ten Years, Fair value 402,323  
Total securities, Mortgage- backed and Equity 1,282,038  
Total securities, Fair value 2,292,660 2,441,276
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Agencies [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Total available-for-sale securities, Mortgage-backed and Equity 1,070,081  
Available-for-sale, Estimated Fair Value 1,070,081 1,176,080
Total held-to-maturity securities, Mortgage-backed and Equity 207,419  
Held-to-maturity securities, Fair value 207,419 216,327
Obligations of State and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Total available-for-sale securities, One Year or less 7,304  
Total available-for-sale securities, One to Five Years 21,305  
Total available-for-sale securities, Five to Ten Years 36,994  
Total available-for-sale securities, After Ten Years 15,872  
Available-for-sale, Estimated Fair Value 81,475 80,265
Total held-to-maturity securities, One Year or less 355  
Total held-to-maturity securities, One to Five Years 52,493  
Total held-to-maturity securities, Five to Ten Years 380,269  
Total held-to-maturity securities, After Ten Years 367,585  
Held-to-maturity securities, Fair value 800,702 787,434
Corporate Debt Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Total available-for-sale securities, One to Five Years 23,076  
Total available-for-sale securities, Five to Ten Years 10,423  
Total available-for-sale securities, After Ten Years 1,987  
Available-for-sale, Estimated Fair Value 35,486 58,593
Total held-to-maturity securities, One to Five Years 955  
Total held-to-maturity securities, Five to Ten Years 35,568  
Held-to-maturity securities, Fair value 36,523 34,446
Obligations of Government Agencies [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Total available-for-sale securities, One Year or less 2,004  
Total available-for-sale securities, One to Five Years 9,998  
Total available-for-sale securities, Five to Ten Years 27,555  
Total available-for-sale securities, After Ten Years 16,879  
Available-for-sale, Estimated Fair Value 56,436 83,505
Equity Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Total available-for-sale securities, Mortgage-backed and Equity 4,538  
Available-for-sale, Estimated Fair Value $ 4,538 $ 4,626