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Investment Securities - Amortized Cost and Estimated Fair Values of Investments in Debt and Equity Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 402,740 $ 79,165
Gross Unrealized Gains 4,189 4,065
Gross Unrealized Losses (2,044) (25)
Estimated Fair Value 404,885 83,205
Amortized Cost, Held to Maturity 726,530 676,426
Gross Unrealized Gains, Held to Maturity 8,671 13,185
Gross Unrealized Losses, Held to Maturity (2,992) (832)
Estimated Fair Value, Held to Maturity 732,209 688,779
Obligations of U.S. Government Corporations and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 312,917 71,144
Gross Unrealized Gains 2,761 4,001
Gross Unrealized Losses (1,996) (25)
Estimated Fair Value 313,682 75,120
Amortized Cost, Held to Maturity 711,994 660,836
Gross Unrealized Gains, Held to Maturity 8,394 13,055
Gross Unrealized Losses, Held to Maturity (2,882) (677)
Estimated Fair Value, Held to Maturity 717,506 673,214
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 86,823 3,130
Gross Unrealized Gains 1,428 45
Gross Unrealized Losses (33)  
Estimated Fair Value 88,218 3,175
Amortized Cost, Held to Maturity 14,536 15,590
Gross Unrealized Gains, Held to Maturity 277 130
Gross Unrealized Losses, Held to Maturity (110) (155)
Estimated Fair Value, Held to Maturity 14,703 15,565
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   1,891
Gross Unrealized Gains   17
Estimated Fair Value   1,908
Marketable Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,000 3,000
Gross Unrealized Gains   2
Gross Unrealized Losses (15)  
Estimated Fair Value $ 2,985 $ 3,002