Quarterly report pursuant to Section 13 or 15(d)

Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail)

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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within one year, Amortized Cost $ 699  
Available-for-Sale Over one year through five years, Amortized Cost 30,847  
Available-for-Sale Over five years through ten years, Amortized Cost 86,380  
Available-for-Sale Over ten years, Amortized Cost 36,943  
Available-for-Sale, Amortized Cost 532,501 549,113
Available-for-Sale Within one year, Estimated Fair Value 737  
Available-for-Sale Over one year through five years, Estimated Fair Value 30,693  
Available-for-Sale Over five years through ten years, Estimated Fair Value 82,511  
Available-for-Sale Over ten years, Estimated Fair Value 34,653  
Available-for-Sale, Estimated Fair Value 520,990 530,926
Collateralized mortgage obligations [Member]
   
Summary of Investment Holdings [Line Items]    
Available-for-Sale, Amortized Cost 149,269 130,636
Available-for-Sale, Estimated Fair Value 148,031 127,693
Mortgage-backed securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available-for-Sale, Amortized Cost 228,363 222,768
Available-for-Sale, Estimated Fair Value $ 224,365 $ 217,059