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Securities Available for Sale - Schedule of Amortized Cost and Fair Values of Securities Available for Sale by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]    
Due in one year or less, Amortized Cost $ 1,560  
Due after one year through five years, Amortized Cost 7,422  
Due after five years through ten years, Amortized Cost 32,311  
Due after ten years, Amortized Cost 74,516  
Mortgage-backed securities and collateralized mortgage obligations, Amortized Cost 319,061  
Total debt securities, Amortized Cost 434,870 414,298
Equity securities, Amortized Cost 50 50
Available for sale securities, Total, Amortized Cost 434,920 414,348
Due in one year or less, Fair Value 1,563  
Due after one year through five years, Fair Value 7,403  
Due after five years through ten years, Fair Value 31,502  
Due after ten years, Fair Value 73,097  
Mortgage-backed securities and collateralized mortgage obligations, Fair Value 318,152  
Available for sale securities, debt securities, Fair Value 431,717 406,874
Equity securities, Fair Value 69 69
Available for sale securities, Total $ 431,786 $ 406,943