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Investment Securities - Amortized Cost and Fair value of Debt Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment $ 19,707 $ 15,902
Fair Value 19,537 16,774
Available-For-Sale [Member]
   
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total 134,778  
Available-for-sale Securities, Amortized Cost 149,001 154,536
Available-for-sale Securities, Fair Value 137,410  
Held-to-Maturity [Member]
   
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Held-to-maturity Securities Debt Maturities, Amortized Cost 7,742  
Held-to-maturity Securities, Debt Maturities, Fair Value, Total 7,047  
U.S. Agency Securities [Member] | Available-For-Sale [Member]
   
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Available-for-sale Securities, Debt Maturities, due in one year or less, Amortized Cost Basis 13,990  
Available-for-sale Securities, Debt Maturities, after one year through five years, Amortized Cost Basis 67,814  
Available-for-sale Securities, Amortized Cost 81,804 83,927
Available-for-sale Securities, Debt Maturities, due in one year or less, Fair Value 14,055  
Available-for-sale Securities, Debt Maturities, after one year through five years, Fair Value 67,712  
U.S. Agency Securities [Member] | Held-to-Maturity [Member]
   
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Held-to-maturity Securities Debt Maturities, due in one year or less, Amortized Cost     
Held-to-maturity Securities Debt Maturities after one year through five years, Amortized Cost     
Held-to-maturity Securities, Debt Maturities, due in one year or less, Fair Value     
Held-to-maturity Securities, Debt Maturities, after one year through five years, Fair Value     
States & Political Subdivisions [Member]
   
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment 7,742 1,083
Fair Value 7,047 1,099
States & Political Subdivisions [Member] | Available-For-Sale [Member]
   
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Available-for-sale Securities, Debt Maturities, due in one year or less, Amortized Cost Basis 10  
Available-for-sale Securities, Debt Maturities, after one year through five years, Amortized Cost Basis 130  
Available-for-sale Securities, Debt Maturities, after five years through ten years, Amortized Cost Basis 2,122  
Available-for-sale Securities, Debt Maturities, after ten years, Amortized Cost Basis 50,712  
Available-for-sale Securities, Amortized Cost 52,974 53,846
Available-for-sale Securities, Debt Maturities, due in one year or less, Fair Value 11  
Available-for-sale Securities, Debt Maturities, after one year through five years, Fair Value 131  
Available-for-sale Securities, Debt Maturities, after five years through ten years, Fair Value 2,277  
Available-for-sale Securities, Debt Maturities, after ten years, Fair Value 53,224  
States & Political Subdivisions [Member] | Held-to-Maturity [Member]
   
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Held-to-maturity Securities Debt Maturities, due in one year or less, Amortized Cost     
Held-to-maturity Securities Debt Maturities after one year through five years, Amortized Cost     
Held-to-maturity Securities Debt Maturities, after five years through ten years, Amortized Cost 869  
Held-to-maturity Securities Debt Maturities, after ten years, Amortized Cost 6,873  
Held-to-maturity Securities, Debt Maturities, due in one year or less, Fair Value     
Held-to-maturity Securities, Debt Maturities, after one year through five years, Fair Value     
Held-to-maturity Securities, Debt Maturities, after five years through ten years, Fair Value 882  
Held-to-maturity Securities, Debt Maturities, after ten years, Fair Value 6,165  
Mortgage-Backed Securities [Member]
   
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total 13,572  
Available-for-sale Securities, Fair Value 14,159  
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment 11,965  
Fair Value 12,490  
Mortgage-Backed Securities [Member] | Available-For-Sale [Member]
   
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Available-for-sale Securities, Amortized Cost 13,572 15,962
Total Debt Securities [Member]
   
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Available-for-sale Securities, Amortized Cost 148,350  
Available-for-sale Securities, Fair Value 151,569  
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment 19,707  
Fair Value 19,537  
Total Debt Securities [Member] | Available-For-Sale [Member]
   
Debt Securities Amortized Cost And Fair Value By Contractual Maturity [Abstract]    
Available-for-sale Securities, Amortized Cost $ 148,350 $ 153,735