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Borrowings - Summary of Long-Term Borrowings (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Federal Home Loan Bank advances $ 330,098 $ 305,110
Subordinated notes 87,558 87,147
Junior subordinated debt 109,987 48,600
Other subordinated debt 168,563 98,637
Total long-term borrowings $ 696,206 $ 539,494