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Investments - Available for Sale and Held to Maturity Securities with Gross Unrealized Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available for Sale and Held to Maturity Securities, Less Than Twelve Months, Fair Value $ 13,713 $ 195,113
Available for Sale and Held to Maturity Securities, Less Than Twelve Months, Gross Unrealized Losses 129 13,103
Available for Sale and Held to Maturity Securities, Over Twelve Months, Fair Value 169,099 4,621
Available for Sale and Held to Maturity Securities, Over Twelve Months, Gross Unrealized Losses 6,426 379
Available for Sale and Held to Maturity Securities, Total, Fair Value 182,812 199,734
Available for Sale and Held to Maturity Securities, Total, Gross Unrealized Losses 6,555 13,482
U.S. Treasuries [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for Sale and Held to Maturity Securities, Less Than Twelve Months, Fair Value 4,936 29,708
Available for Sale and Held to Maturity Securities, Less Than Twelve Months, Gross Unrealized Losses 47 1,042
Available for Sale and Held to Maturity Securities, Over Twelve Months, Fair Value 25,300  
Available for Sale and Held to Maturity Securities, Over Twelve Months, Gross Unrealized Losses 490  
Available for Sale and Held to Maturity Securities, Total, Fair Value 30,236 29,708
Available for Sale and Held to Maturity Securities, Total, Gross Unrealized Losses 537 1,042
U.S. Government agencies [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for Sale and Held to Maturity Securities, Less Than Twelve Months, Fair Value 4,931 113,446
Available for Sale and Held to Maturity Securities, Less Than Twelve Months, Gross Unrealized Losses 42 10,322
Available for Sale and Held to Maturity Securities, Over Twelve Months, Fair Value 111,427 4,621
Available for Sale and Held to Maturity Securities, Over Twelve Months, Gross Unrealized Losses 5,420 379
Available for Sale and Held to Maturity Securities, Total, Fair Value 116,358 118,067
Available for Sale and Held to Maturity Securities, Total, Gross Unrealized Losses 5,462 10,701
Mortgage-backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for Sale and Held to Maturity Securities, Less Than Twelve Months, Fair Value   44,269
Available for Sale and Held to Maturity Securities, Less Than Twelve Months, Gross Unrealized Losses   1,269
Available for Sale and Held to Maturity Securities, Over Twelve Months, Fair Value 28,317   
Available for Sale and Held to Maturity Securities, Over Twelve Months, Gross Unrealized Losses 452   
Available for Sale and Held to Maturity Securities, Total, Fair Value 28,317 44,269
Available for Sale and Held to Maturity Securities, Total, Gross Unrealized Losses 452 1,269
States and political subdivisions [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for Sale and Held to Maturity Securities, Less Than Twelve Months, Fair Value 3,846 7,690
Available for Sale and Held to Maturity Securities, Less Than Twelve Months, Gross Unrealized Losses 40 470
Available for Sale and Held to Maturity Securities, Over Twelve Months, Fair Value 4,055   
Available for Sale and Held to Maturity Securities, Over Twelve Months, Gross Unrealized Losses 64   
Available for Sale and Held to Maturity Securities, Total, Fair Value 7,901 7,690
Available for Sale and Held to Maturity Securities, Total, Gross Unrealized Losses $ 104 $ 470