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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 324,500 $ 346,673
Gross Unrealized Gains 5,023 9,459
Gross Unrealized Losses (5,014) (227)
Estimated Market Value 324,509 355,905
U.S. Treasury [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 26,067 10,604
Gross Unrealized Gains      
Gross Unrealized Losses (795) (36)
Estimated Market Value 25,272 10,568
U.S. Government agency [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 174,772 216,466
Gross Unrealized Gains 1,386 3,905
Gross Unrealized Losses (3,186) (171)
Estimated Market Value 172,972 220,200
Mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 44,638 51,581
Gross Unrealized Gains 728 1,425
Gross Unrealized Losses (574)   
Estimated Market Value 44,792 53,006
State and local governments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 79,023 68,022
Gross Unrealized Gains 2,909 4,129
Gross Unrealized Losses (459) (20)
Estimated Market Value $ 81,473 $ 72,131