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Borrowings - Summary of Long-Term Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Federal Home Loan Bank advances	$ 400,018	$ 400,042
Subordinated notes	83,197us-gaap_SubordinatedLongTermDebt	83,155us-gaap_SubordinatedLongTermDebt
Junior subordinated debt	58,259	58,246
Long-term debt	$ 541,474us-gaap_LongTermDebt	$ 541,443us-gaap_LongTermDebt

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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