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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Investments Debt And Equity Securities [Abstract]    
Available-for-Sale, Maturing within one year, Amortized Cost $ 192  
Available-for-Sale, Maturing after one to five years, Amortized Cost 8,254  
Available-for-Sale, Maturing after five to ten years, Amortized Cost 118,098  
Available-for-Sale, Maturing after ten years, Amortized Cost 76,737  
Available-for-Sale, Amortized Cost 203,281 $ 202,039
Available-for-Sale, Maturing within one year, Estimated Fair Value 193  
Available-for-Sale, Maturing after one to five years, Estimated Fair Value 8,573  
Available-for-Sale, Maturing after five to ten years, Estimated Fair Value 118,661  
Available-for-Sale, Maturing after ten years, Estimated Fair Value 77,292  
Available-for-Sale, Estimated Fair Value, Total 204,719 204,966
Held-to-Maturity, Maturing after one to five years, Amortized Cost 713  
Held-to-Maturity, Maturing after five to ten years, Amortized Cost 10,832  
Held-to-Maturity, Maturing after ten years, Amortized Cost 22,745  
Held-to-Maturity, Amortized Cost 34,290 29,120
Held-to-Maturity, Maturing after one to five years, Estimated Fair Value 708  
Held-to-Maturity, Maturing after five to ten years, Estimated Fair Value 10,859  
Held-to-Maturity, Maturing after ten years, Estimated Fair Value 22,655  
Held-to-Maturity, Estimated Fair Value, Total $ 34,222 $ 29,154