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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 54,704 $ 68,985
Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Accumulated Loss 342 1,188
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,878 2,227
Held To Maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer Accumulated Loss 174 150
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 58,582 71,212
Gross Unrealized Losses 516 1,338
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 90,883 138,107
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 2,018 6,191
Fair Value of Investments with Unrealized Losses, 12 Months or Greater 17,942 7,525
Gross Unrealized Losses, 12 Months or Greater 3,987 2,844
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 108,825 145,632
Available-for Sale, Gross Unrealized Losses, Total 6,005 9,035
Corporate bonds [Member]
    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 24,290 14,090
Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Accumulated Loss 74 41
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 24,290 14,090
Gross Unrealized Losses 74 41
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 45,493 29,691
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 198 361
Fair Value of Investments with Unrealized Losses, 12 Months or Greater      
Gross Unrealized Losses, 12 Months or Greater      
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 45,493 29,691
Available-for Sale, Gross Unrealized Losses, Total 198 361
States and political subdivisions [Member]
    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 27,027 54,895
Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Accumulated Loss 262 1,147
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,012 311
Held To Maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer Accumulated Loss 41 6
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 29,039 55,206
Gross Unrealized Losses 303 1,153
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 43,605 101,908
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 1,371 4,798
Fair Value of Investments with Unrealized Losses, 12 Months or Greater 12,247 1,753
Gross Unrealized Losses, 12 Months or Greater 1,419 342
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 55,852 103,661
Available-for Sale, Gross Unrealized Losses, Total 2,790 5,140
U.S. agency-based mortgage-backed securities [Member]
    
Investment [Line Items]    
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 1,324 1,303
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 423 465
Fair Value of Investments with Unrealized Losses, 12 Months or Greater 5,695 5,772
Gross Unrealized Losses, 12 Months or Greater 2,568 2,502
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 7,019 7,075
Available-for Sale, Gross Unrealized Losses, Total 2,991 2,967
Equity securities [Member]
    
Investment [Line Items]    
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 461 5,205
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 26 567
Fair Value of Investments with Unrealized Losses, 12 Months or Greater      
Gross Unrealized Losses, 12 Months or Greater      
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 461 5,205
Available-for Sale, Gross Unrealized Losses, Total 26 567
Asset-backed securities [Member]
    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,866 1,916
Held To Maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer Accumulated Loss 133 144
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 1,866 1,916
Gross Unrealized Losses 133 144
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 3,387  
Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Accumulated Loss 6  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 3,387  
Gross Unrealized Losses 6  
Held-to-maturity securities [Member]
    
Investment [Line Items]    
Fair Value of Investments with Unrealized Losses, Less Than 12 months 145,587 207,092
Gross Unrealized Loss, Less Than 12 Months 2,360 7,379
Fair Value of Investments with Unrealized Losses, 12 Months or Greater 21,820 9,752
Gross Unrealized Losses, 12 Months or Greater 4,161 2,994
Fair Value of Investments with Unrealized Losses, Total 167,407 216,844
Gross Unrealized Losses, Total $ 6,521 $ 10,373