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Borrowings - Summary of Long-Term Borrowings (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Federal Home Loan Bank advances $ 355,122 $ 400,017
Subordinated notes 85,188 84,668
Junior subordinated debt 48,591 58,298
Other subordinated debt 98,599 98,497
Total long-term borrowings $ 587,500 $ 641,480