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Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Commercial Loans at Fair Value
 
Assets  
Beginning balance $ 12,129
Transfer to Level 3   
Principal paydowns (37)
Gains (losses) in net income, net 11
Ending Balance 12,103
Trading Securities
 
Assets  
Beginning balance 253,142
Transfer to Level 3   
Principal paydowns (12,199)
Gains (losses) in net income, net 34,165
Acquisitions 21,176
Sales (859)
Other settlements, net 190
Ending Balance 295,615
Available-for-sale Securities
 
Assets  
Beginning balance 728,695
Transfer to Level 3   
Principal paydowns (28,004)
Gains (losses) in net income, net 14,222
Unrealized gains in OCI, net 40,777
Acquisitions 262,860
Sales (52,038)
Other settlements, net 29
Ending Balance 966,541
Mortgage Servicing Rights
 
Assets  
Transfer to Level 3   
Gains (losses) in net income, net (17)
Acquisitions 1,579
Ending Balance 1,562
Derivative Liabilities
 
Liabilities  
Beginning balance 19,500
Transfer to Level 3   
Gains (losses) in net income, net 895
Unrealized gains in OCI, net   
Acquisitions   
Sales   
Other settlements, net (795)
Ending Balance 19,600
Asset-backed Securities | Acacia
 
Liabilities  
Beginning balance 209,381
Transfer to Level 3   
Principal paydowns (9,863)
Gains (losses) in net income, net 32,053
Unrealized gains in OCI, net   
Acquisitions   
Sales   
Other settlements, net 5,354
Ending Balance $ 236,925