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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]    
Available-for-Sale, Maturing within one year, Amortized Cost $ 413  
Available-for-Sale, Maturing after one to five years, Amortized Cost 8,223  
Available-for-Sale, Maturing after five to ten years, Amortized Cost 84,001  
Available-for-Sale, Maturing after ten years, Amortized Cost 73,834  
Available-for-Sale, Amortized Cost, Total 166,471  
Available-for-Sale, Maturing within one year, Estimated Fair Value 411  
Available-for-Sale, Maturing after one to five years, Estimated Fair Value 8,665  
Available-for-Sale, Maturing after five to ten years, Estimated Fair Value 84,906  
Available-for-Sale, Maturing after ten years, Estimated Fair Value 75,128  
Available-for-Sale, Estimated Fair Value 169,110 135,754
Held-to-Maturity, Maturing within one year, Amortized Cost 0  
Held-to-Maturity, Maturing after one to five years, Amortized Cost 0  
Held-to-Maturity, Maturing after five to ten years, Amortized Cost 18,159  
Held-to-Maturity, Maturing after ten years, Amortized Cost 22,676  
Held-to-Maturity, Amortized Cost, Total 40,835 35,050
Held-to-Maturity, Maturing within one year, Estimated Fair Value 0  
Held-to-Maturity, Maturing after one to five years, Estimated Fair Value 0  
Held-to-Maturity, Maturing after five to ten years, Estimated Fair Value 18,061  
Held-to-Maturity, Maturing after ten years, Estimated Fair Value 22,159  
Held-to-Maturity, Estimated Fair Value $ 40,220