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Securities - Summary of Amortized Cost and Estimated Fair Values of Securities Held for Investment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 11,986 $ 16,416
Gross Unrealized Gains 115 281
Gross Unrealized Losses (7) (8)
Estimated Fair Value 12,094 16,689
U.S. Federal agencies [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 607 781
Gross Unrealized Gains 48 59
Gross Unrealized Losses      
Estimated Fair Value 655 840
States and political subdivisions [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 11,379 15,635
Gross Unrealized Gains 67 222
Gross Unrealized Losses (7) (8)
Estimated Fair Value $ 11,439 $ 15,849