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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Investments Debt And Equity Securities [Abstract]    
Available-for-Sale, Maturing within one year, Amortized Cost $ 487  
Available-for-Sale, Maturing after one to five years, Amortized Cost 5,765  
Available-for-Sale, Maturing after five to ten years, Amortized Cost 118,161  
Available-for-Sale, Maturing after ten years, Amortized Cost 73,582  
Available-for-Sale, Amortized Cost 197,995 $ 202,039
Available-for-Sale, Maturing within one year, Estimated Fair Value 496  
Available-for-Sale, Maturing after one to five years, Estimated Fair Value 5,962  
Available-for-Sale, Maturing after five to ten years, Estimated Fair Value 118,360  
Available-for-Sale, Maturing after ten years, Estimated Fair Value 74,025  
Available-for-Sale, Estimated Fair Value, Total 198,843 204,966
Held-to-Maturity, Maturing within one year, Amortized Cost 0  
Held-to-Maturity, Maturing after one to five years, Amortized Cost 1,608  
Held-to-Maturity, Maturing after five to ten years, Amortized Cost 12,824  
Held-to-Maturity, Maturing after ten years, Amortized Cost 17,927  
Held-to-Maturity, Amortized Cost 32,359 29,120
Held-to-Maturity, Maturing within one year, Estimated Fair Value 0  
Held-to-Maturity, Maturing after one to five years, Estimated Fair Value 1,602  
Held-to-Maturity, Maturing after five to ten years, Estimated Fair Value 12,814  
Held-to-Maturity, Maturing after ten years, Estimated Fair Value 17,768  
Held-to-Maturity, Estimated Fair Value, Total $ 32,184 $ 29,154