Changes in Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 34,001	$ 47,574	$ 54,028	$ 53,350
Other comprehensive income (loss) before reclassification	(7,523)	7,886	6,238	7,762
Amounts reclassified from accumulated other comprehensive income (loss)	(1,524)	(1,004)	(35,312)	(6,656)
Other comprehensive income (loss), net of taxes	(9,047)	6,882	(29,074)	1,106
Ending balance	24,954	54,456	24,954	54,456
Unrealized Gains and Losses on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	33,928	47,625	53,950	53,435
Other comprehensive income (loss) before reclassification	(7,295)	7,744	6,396	7,774
Amounts reclassified from accumulated other comprehensive income (loss)	(1,523)	(1,004)	(35,236)	(6,844)
Other comprehensive income (loss), net of taxes	(8,818)	6,740	(28,840)	930
Ending balance	25,110	54,365	25,110	54,365
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	73	(51)	78	(85)
Other comprehensive income (loss) before reclassification	(228)	142	(158)	(12)
Amounts reclassified from accumulated other comprehensive income (loss)	(1)		(76)	188
Other comprehensive income (loss), net of taxes	(229)	142	(234)	176
Ending balance	$ (156)	$ 91	$ (156)	$ 91

- 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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