Information Pertaining to Held to Maturity Securities With Gross Unrealized Losses (Detail) (Corporate Bond, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Corporate Bond
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months Fair Value	$ 40,636	$ 22,785
Less than 12 months Gross Unrealized Losses	(182)	(41)
12 months or longer Fair Value	0	0
12 months or longer Gross Unrealized Losses	0	0
Total Fair Value	40,636	22,785
Total Gross Unrealized Losses	$ (182)	$ (41)

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for those securities which are categorized as held-to-maturity.

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This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity.

+ References+ Details

- Definition

This item represents the fair value of securities categorized as held-to-maturity which are in an unrealized loss position.

+ References+ Details

- Definition

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized as held-to-maturity.

+ References+ Details

- Definition

This item represents the fair value of securities categorized as held-to-maturity that have been in a continuous unrealized loss position for less than twelve months.

+ References+ Details

- Definition

This item represents the fair value of securities categorized as held-to-maturity securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References+ Details