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Changes in Level Three Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Recurring Level 3 Instruments, Beginning Balance $ 1,035
Total gains or losses (realized/unrealized):  
Included in earnings-realized   
Included in earnings-unrealized (77) [1]
Included in other comprehensive income 2,022
Purchases   
Sales   
Issuances   
Settlements   
Transfers in and/or out of Level 3 (2,743)
Recurring Level 3 Instruments, Ending Balance $ 237
[1] Amount reported as other than temporary impairment loss in the noninterest income portion of the Statement of Operations.