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Repurchase Agreements - Narrative (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Repurchase Agreements:
Repurchase agreements - outstanding	$ 71,361,926	$ 61,781,001
Repurchase agreements - weighted average borrowing rates	1.62%	2.33%
Repurchase agreements - weighted average remaining maturities (in days)	141 days	204 days

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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