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Gross Unrealized Losses and Fair Value of Investments with Unrealized Losses Not Deemed to be Other-Than-Temporarily Impaired (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value $ 279,062 $ 119,899
Less than 12 months Unrealized Losses 31,445 1,019
12 months or more Fair Value 39,147 3,066
12 months or more Unrealized Losses 5,572 288
Total Fair Value 318,209 122,965
Total Unrealized Losses 37,017 1,307
Obligations of U.S. Government agencies
   
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 255,350 98,074
Less than 12 months Unrealized Losses 29,954 629
12 months or more Fair Value 26,367  
12 months or more Unrealized Losses 3,633  
Total Fair Value 281,717 98,074
Total Unrealized Losses 33,587 629
Mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 3,581 7,359
Less than 12 months Unrealized Losses 30 19
Total Fair Value 3,581 7,359
Total Unrealized Losses 30 19
State, county and municipal obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months Fair Value 20,131 14,466
Less than 12 months Unrealized Losses 1,461 371
12 months or more Fair Value 10,014 260
12 months or more Unrealized Losses 1,680 1
Total Fair Value 30,145 14,726
Total Unrealized Losses 3,141 372
Other investments
   
Schedule of Available-for-sale Securities [Line Items]    
12 months or more Fair Value 2,766 2,806
12 months or more Unrealized Losses 259 287
Total Fair Value 2,766 2,806
Total Unrealized Losses $ 259 $ 287