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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 36,992 $ 68,985
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 122 1,188
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,222 2,227
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss 122 150
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 40,214 71,212
Gross Unrealized Losses 244 1,338
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 35,901 138,107
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 197 6,191
Fair Value of Investments with Unrealized Losses, 12 Months or Greater 20,717 7,525
Gross Unrealized Losses, 12 Months or Greater 3,856 2,844
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 56,618 145,632
Available-for Sale, Gross Unrealized Losses, Total 4,053 9,035
Corporate bonds [Member]
    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 19,268 14,090
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 57 41
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 19,268 14,090
Gross Unrealized Losses 57 41
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 20,127 29,691
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 30 361
Fair Value of Investments with Unrealized Losses, 12 Months or Greater 986   
Gross Unrealized Losses, 12 Months or Greater 3   
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 21,113 29,691
Available-for Sale, Gross Unrealized Losses, Total 33 361
States and political subdivisions [Member]
    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 14,872 54,895
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 64 1,147
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,423 311
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss 2 6
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 16,295 55,206
Gross Unrealized Losses 66 1,153
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 14,689 101,908
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 82 4,798
Fair Value of Investments with Unrealized Losses, 12 Months or Greater 12,700 1,753
Gross Unrealized Losses, 12 Months or Greater 1,677 342
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 27,389 103,661
Available-for Sale, Gross Unrealized Losses, Total 1,759 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 605 1,303
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 79 465
Fair Value of Investments with Unrealized Losses, 12 Months or Greater 7,031 5,772
Gross Unrealized Losses, 12 Months or Greater 2,176 2,502
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 7,636 7,075
Available-for Sale, Gross Unrealized Losses, Total 2,255 2,967
Equity securities [Member]
    
Investment [Line Items]    
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 480 5,205
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 6 567
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 480 5,205
Available-for Sale, Gross Unrealized Losses, Total 6 567
Asset-backed securities [Member]
    
Investment [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,799 1,916
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss 120 144
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 1,799 1,916
Gross Unrealized Losses 120 144
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 2,852  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss 1  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 2,852  
Gross Unrealized Losses 1  
Held-to-maturity securities [Member]
    
Investment [Line Items]    
Fair Value of Investments with Unrealized Losses, Less Than 12 months 72,893 207,092
Gross Unrealized Loss, Less Than 12 Months 319 7,379
Fair Value of Investments with Unrealized Losses, 12 Months or Greater 23,939 9,752
Gross Unrealized Losses, 12 Months or Greater 3,978 2,994
Fair Value of Investments with Unrealized Losses, Total 96,832 216,844
Gross Unrealized Losses, Total $ 4,297 $ 10,373