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Fair Value - Sale Securities Reported as Level 1 Securities as of Beginning of Period Were Transferred to Level 2 Category (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Securities transferred to level 2 fair value	$ 0	$ 70,278	$ 0	$ 15,232
U.S. Government Sponsored Entities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Securities transferred to level 2 fair value	0	26,034	0	2,000
States and Political Subdivisions [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Securities transferred to level 2 fair value	0	3,771	0	4,655
Residential Mortgage and Assets Backed [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Securities transferred to level 2 fair value	$ 0	$ 40,473	$ 0	$ 8,577

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

No definition available.

+ Details

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- Details

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