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Investments - Gross Unrealized Gains and Losses and the Amortized Cost and Fair Value of Investments Classified as Held-to-maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Investment [Line Items]    
Amortized Cost $ 536,583 $ 583,287
Gross Unrealized Gains 25,934 44,361
Gross Unrealized Losses (1,338) (299)
Fair Value 561,179 627,349
States and political subdivisions [Member]
    
Investment [Line Items]    
Amortized Cost 381,674 400,687
Gross Unrealized Gains 18,634 31,387
Gross Unrealized Losses (1,153) (106)
Fair Value 399,155 431,968
Corporate bonds [Member]
    
Investment [Line Items]    
Amortized Cost 67,423 82,824
Gross Unrealized Gains 861 1,565
Gross Unrealized Losses (41) (12)
Fair Value 68,243 84,377
Commercial mortgage-backed securities [Member]
    
Investment [Line Items]    
Amortized Cost 50,813 51,529
Gross Unrealized Gains 3,431 6,433
Fair Value 54,244 57,962
U.S. agency-based mortgage-backed securities [Member]
    
Investment [Line Items]    
Amortized Cost 21,775 32,984
Gross Unrealized Gains 1,790 3,063
Gross Unrealized Losses   (5)
Fair Value 23,565 36,042
U.S. Treasury securities and obligations of U.S. Government agencies [Member]
    
Investment [Line Items]    
Amortized Cost 11,514 11,034
Gross Unrealized Gains 1,002 1,721
Fair Value 12,516 12,755
Asset-backed securities [Member]
    
Investment [Line Items]    
Amortized Cost 3,384 4,229
Gross Unrealized Gains 216 192
Gross Unrealized Losses (144) (176)
Fair Value $ 3,456 $ 4,245