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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 21,253 $ 165,286
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 80 751
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 6,792 19,556
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss 123 200
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 28,045 184,842
Held-to-maturity Securities, Gross Unrealized Losses 203 951
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 11,815 148,851
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 104 1,521
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater 15,592 15,449
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater 957 1,765
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 27,407 164,300
Available-for Sale, Gross Unrealized Losses, Total 1,061 3,286
Fair Value of Investments with Unrealized Losses, Less Than 12 months 33,068 314,137
Gross Unrealized Loss, Less Than 12 Months 184 2,272
Fair Value of Investments with Unrealized Losses, 12 Months or Greater 22,384 35,005
Gross Unrealized Losses, 12 Months or Greater 1,080 1,965
Fair Value of Investments with Unrealized Losses, Total 55,452 349,142
Gross Unrealized Losses, Total 1,264 4,237
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   2,980
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss   4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value   2,980
Held-to-maturity Securities, Gross Unrealized Losses   4
Corporate Bonds [Member]    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 14,753 128,436
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 71 687
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 5,498 18,139
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss 46 123
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 20,251 146,575
Held-to-maturity Securities, Gross Unrealized Losses 117 810
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 10,008 141,857
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 103 1,475
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater 3,078 4,216
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater 185 11
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 13,086 146,073
Available-for Sale, Gross Unrealized Losses, Total 288 1,486
States and Political Subdivisions [Member]    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,780 24,068
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 3 45
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 4,780 24,068
Held-to-maturity Securities, Gross Unrealized Losses 3 45
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 1,807 6,560
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 1 9
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater 4,722 4,439
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater 69 198
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 6,529 10,999
Available-for Sale, Gross Unrealized Losses, Total 70 207
U.S. Agency-Based Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   18
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 25 28
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss 1 1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 25 46
Held-to-maturity Securities, Gross Unrealized Losses 1 1
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months   434
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months   37
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater 7,792 6,794
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater 703 1,556
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 7,792 7,228
Available-for Sale, Gross Unrealized Losses, Total 703 1,593
Commercial Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,720 9,784
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 6 15
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 1,720 9,784
Held-to-maturity Securities, Gross Unrealized Losses 6 15
Asset-Backed Securities [Member]    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,269 1,389
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss 76 76
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 1,269 1,389
Held-to-maturity Securities, Gross Unrealized Losses $ 76 $ 76