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Offsetting Assets and Liabilities (Details) (USD $)
3 Months Ended
Mar. 31, 2013
counterparty
Dec. 31, 2012
Derivative hedging instruments, at fair value    
Gross Amounts of Recognized Assets $ 324,000 $ 203,000
Net Amounts of Assets Presented in the Consolidated Balance Sheet 324,000 203,000
Gross Amounts Not Offset in the Consolidated Balance Sheet    
Financial Instruments (324,000) (203,000)
Total    
Gross Amounts of Recognized Assets 324,000 203,000
Net Amounts of Assets Presented in the Consolidated Balance Sheet 324,000 203,000
Gross Amounts Not Offset in the Consolidated Balance Sheet    
Financial Instruments (324,000) (203,000)
Derivative hedging instruments, at fair value    
Gross Amounts of Recognized Liabilities 50,839,000 63,034,000
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 50,839,000 63,034,000
Gross Amounts Not Offset in the Consolidated Balance Sheet    
Financial Instruments (45,822,000) (58,018,000)
Cash Collateral Pledged (5,017,000) (5,016,000)
Repurchase agreements    
Gross Amounts of Recognized Liabilities 8,902,827,000 8,752,472,000
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 8,902,827,000 8,752,472,000
Gross Amounts Not Offset in the Consolidated Balance Sheet    
Financial Instruments (8,902,827,000) (8,752,472,000)
Total    
Gross Amounts of Recognized Liabilities 8,953,666,000 8,815,506,000
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 8,953,666,000 8,815,506,000
Gross Amounts Not Offset in the Consolidated Balance Sheet    
Financial Instruments (8,948,649,000) (8,810,490,000)
Cash Collateral Pledged (5,017,000) (5,016,000)
Additional disclosures    
Fair value of securities pledged against the swaps 57,100,000 68,900,000
Fair value of securities pledged against the repurchase agreements $ 10,908,000,000 $ 10,550,000,000
Number of repurchase agreement counterparties with unconditional right of setoff 1