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Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 212,380 $ 882,696
Federal Home Loan Bank advances 840,000 820,000
Federal funds purchased 330,000 210,000
Subordinated notes 125,202 128,962
Short-term borrowings $ 1,507,582 $ 2,041,658