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Loans (Detail) - Book Value of Loans Pledged (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Loans pledged to secure:    
FHLB advances $ 1,632,069 $ 721,141
Federal Reserve Bank's Discount Window Primary Credit Program 766,870 2,097,021
Total $ 2,398,939 $ 2,818,162