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Securities - Sales of Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Proceeds from sales $ 0 $ 4,498,102
Gross realized gains 0 5
Gross realized losses 0 0
Tax (expense) benefit of securities gains/losses $ 0 $ (2)