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Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 297,562 $ 266,732
Federal Home Loan Bank advances 490,000 1,090,000
Federal funds purchased 652,000 568,000
Subordinated notes 124,326 124,164
Short-term borrowings $ 1,563,888 $ 2,048,896