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Borrowings - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Credit available with FHLB	$ 3,574,396
Credit with FHLB used	$ 150,073	$ 50,076
Federal Home Loan Bank advances are scheduled to mature periodically through the year	2019
Effective interest rates, minimum	0.95%	1.06%
Effective interest rates, maximum	4.19%	4.19%

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The last year of maturity for the advances from the Federal Home Loan Bank as of the Balance Sheet date.

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States the lowest interest rate applicable to any of the advances from the Federal Home Loan Bank as of the Balance Sheet date.

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States the highest interest rate applicable to any of the advances from the Federal Home Loan Bank as of the Balance Sheet date.

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

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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