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Other Borrowings - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Subordinated debt issued	$ 65,325,000us-gaap_SubordinatedDebt	$ 55,466,000us-gaap_SubordinatedDebt
Borrowing available with FHLB	221,500,000
Credit arrangements for federal funds purchase	50,000,000
Loans pledged at federal reserve discount window	621,500,000
Loans pledged at federal reserve discount window available for borrowing	442,800,000
Prosperity Bank [Member]
Debt Instrument [Line Items]
Subordinated debt issued	15,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available borrowing under revolving credit agreement	$ 16,000,000

Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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