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Borrowings - Summary of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
Federal Home Loan Bank advances $ 150,073 $ 50,076
Subordinated notes 85,679 84,637
Other subordinated debt   8,637
Convertible debt   578
Long-term debt $ 235,752 $ 143,928