Credit Risk and Interest Rate Risk - Offsetting Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Repurchase Agreements
Gross Amounts of Recognized Assets (Liabilities)	$ (7,146,996)	$ (13,427,545)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	(7,146,996)	(13,427,545)
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	8,341,399	15,399,244
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	419,160	20,211
Net Amount	1,613,563	1,991,910
Derivative Asset
Net Amounts Offset in the Consolidated Statements of Financial Position	0	3,611
Derivative Liability
Net Amounts Offset in the Consolidated Statements of Financial Position	0	0
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)	(7,146,996)	(13,628,545)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	204,611
Net Amounts Offset in the Consolidated Statements of Financial Position	(7,146,996)	(13,423,934)
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	8,341,399	15,399,244
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	419,160	141,194
Net Amount	1,613,563	2,116,504
Interest Rate Swaps
Derivative Asset
Gross Amounts of Recognized Assets (Liabilities)		1,092
Gross Amounts Offset in the Consolidated Statements of Financial Position		(1,092)
Net Amounts Offset in the Consolidated Statements of Financial Position	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments		0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged		119,469
Net Amount		119,469
Derivative Liability
Derivatives		(205,703)
Gross Amounts Offset in the Consolidated Statements of Financial Position		205,703
Net Amounts Offset in the Consolidated Statements of Financial Position	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments		0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged		0
Net Amount		0
Treasury Futures
Derivative Asset
Gross Amounts of Recognized Assets (Liabilities)		3,611
Gross Amounts Offset in the Consolidated Statements of Financial Position		0
Net Amounts Offset in the Consolidated Statements of Financial Position	0	3,611
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments		0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged		1,514
Net Amount		5,125
Derivative Liability
Derivatives		0
Gross Amounts Offset in the Consolidated Statements of Financial Position		0
Net Amounts Offset in the Consolidated Statements of Financial Position	$ 0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments		0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged		0
Net Amount		$ 0

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