Other Comprehensive Income/(Loss) - Summary of the Change in Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2013 Unrealized (Loss)/Gain on Investment Securities Available-for-Sale [Member]	Jun. 30, 2012 Unrealized (Loss)/Gain on Investment Securities Available-for-Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		$ 43,251	$ 43,251	$ 41,469
Net change in fair value recorded in accumulated OCI	(31,236)	(38,019)	(38,019)	2,115
Net realized gains reclassified into earnings		(1,215)	(1,215)
Ending balance	$ 4,017	$ 4,017	$ 4,017	$ 43,584

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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