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Loans (Detail) - Carrying Value of Loans Pledged - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Loans pledged to secure:    
FHLB advances $ 3,057,421 $ 1,952,736
FRB's Discount Window Primary Credit Program 841,808 845,974
Total $ 3,899,229 $ 2,798,710