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Borrowings - Summary of Long-Term Borrowings (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Federal Home Loan Bank advances $ 425,135 $ 400,017
Subordinated notes 84,569 84,668
Junior subordinated debt 48,581 58,298
Other subordinated debt 98,559 98,497
Total long-term borrowings $ 656,844 $ 641,480