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Borrowings - Summary of Long-Term Borrowings (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Federal Home Loan Bank advances $ 425,147 $ 400,017
Subordinated notes 85,206 84,668
Junior subordinated debt 48,572 58,298
Other subordinated debt 98,520 98,497
Long-term debt $ 657,445 $ 641,480