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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 88,724 $ 150,147
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 388 582
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 21,755 1,662
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss 108 82
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 110,479 151,809
Held-to-maturity Securities, Gross Unrealized Losses 496 664
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 58,293 110,622
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 527 487
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater 15,527 18,104
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater 1,842 3,007
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 73,820 128,726
Available-for Sale, Gross Unrealized Losses, Total 2,369 3,494
Fair Value of Investments with Unrealized Losses, Less Than 12 months 147,017 260,769
Gross Unrealized Loss, Less Than 12 Months 915 1,069
Fair Value of Investments with Unrealized Losses, 12 Months or Greater 37,282 19,766
Gross Unrealized Losses, 12 Months or Greater 1,950 3,089
Fair Value of Investments with Unrealized Losses, Total 184,299 280,535
Gross Unrealized Losses, Total 2,865 4,158
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   3,385
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss   2
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value   3,385
Held-to-maturity Securities, Gross Unrealized Losses   2
Corporate Bonds [Member]    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 52,041 129,788
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 192 520
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 20,270  
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss 49  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 72,311 129,788
Held-to-maturity Securities, Gross Unrealized Losses 241 520
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 46,388 106,185
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 440 470
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater 4,241  
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater 11  
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 50,629 106,185
Available-for Sale, Gross Unrealized Losses, Total 451 470
States and Political Subdivisions [Member]    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 36,630 16,896
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 195 58
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 36,630 16,896
Held-to-maturity Securities, Gross Unrealized Losses 195 58
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 11,419 3,810
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 61 6
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater 4,263 10,347
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater 386 1,666
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 15,682 14,157
Available-for Sale, Gross Unrealized Losses, Total 447 1,672
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 53 78
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 1 2
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 5  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 58 78
Held-to-maturity Securities, Gross Unrealized Losses 1 2
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 486 627
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 26 11
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater 7,023 7,757
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater 1,445 1,341
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 7,509 8,384
Available-for Sale, Gross Unrealized Losses, Total 1,471 1,352
Asset-Backed Securities [Member]    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,480 1,662
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss 59 82
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 1,480 1,662
Held-to-maturity Securities, Gross Unrealized Losses $ 59 $ 82