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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
6 Months Ended
Jun. 30, 2013
Residential Loans at Fair Value
 
Assets  
Beginning balance $ 553,576
Principal paydowns (2,486)
(Losses) gains in net income, net (19,601)
Acquisitions 5,154,352
Sales (4,465,558)
Other settlements, net (915)
Ending Balance 1,219,368
Trading Securities
 
Assets  
Beginning balance 33,172
Principal paydowns (31)
(Losses) gains in net income, net 33,558
Acquisitions 91,850
Sales (16,934)
Ending Balance 141,615
Available-for-sale Securities
 
Assets  
Beginning balance 1,075,581
Principal paydowns (81,218)
(Losses) gains in net income, net 26,722
Unrealized losses in OCI, net (41,230)
Acquisitions 207,096
Sales (14,261)
Ending Balance 1,172,690
Mortgage Servicing Rights
 
Assets  
Beginning balance 5,315
(Losses) gains in net income, net 9,169
Acquisitions 28,614
Ending Balance $ 43,098