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Investments - Amortized Cost and Fair Value of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost $ 288,165 $ 254,299
Available for sale securities, Gross Unrealized Gains 2,283 4,996
Available for sale securities, Gross Unrealized Losses (8,130) (419)
Available for sale securities, Fair Value 282,318 258,876
Held to maturity securities, Amortized Cost 9,732 7,125
Held to maturity securities, Gross Unrealized Gains 22 112
Held to maturity securities, Gross Unrealized Losses (476) (12)
Held to maturity securities, Fair Value 9,278 7,225
Debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost 287,515 253,649
Available for sale securities, Gross Unrealized Gains 2,283 4,996
Available for sale securities, Gross Unrealized Losses (8,130) (419)
Available for sale securities, Fair Value 281,668 258,226
Equity securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost 650 650
Available for sale securities, Fair Value 650 650
States and political subdivisions [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Held to maturity securities, Amortized Cost 9,732 7,125
Held to maturity securities, Gross Unrealized Gains 22 112
Held to maturity securities, Gross Unrealized Losses (476) (12)
Held to maturity securities, Fair Value 9,278 7,225
States and political subdivisions [Member] | Debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost 35,268 35,433
Available for sale securities, Gross Unrealized Gains 1,265 2,158
Available for sale securities, Gross Unrealized Losses (3)  
Available for sale securities, Fair Value 36,530 37,591
U.S. Treasuries [Member] | Debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost 43,734 53,661
Available for sale securities, Gross Unrealized Gains 24 490
Available for sale securities, Gross Unrealized Losses (652) (55)
Available for sale securities, Fair Value 43,106 54,096
U.S. Government agencies [Member] | Debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost 165,749 147,652
Available for sale securities, Gross Unrealized Gains 835 1,810
Available for sale securities, Gross Unrealized Losses (6,417) (364)
Available for sale securities, Fair Value 160,167 149,098
Mortgage-backed securities [Member] | Debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost 42,764 16,903
Available for sale securities, Gross Unrealized Gains 159 538
Available for sale securities, Gross Unrealized Losses (1,058)  
Available for sale securities, Fair Value $ 41,865 $ 17,441