Credit Risk and Interest Rate Risk - Offsetting Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Repurchase Agreements
Gross Amounts of Recognized Assets (Liabilities)	$ (13,427,545)	$ (14,030,465)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	(13,427,545)	(14,030,465)
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	15,399,244	15,831,008
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	20,211	0
Net Amount	1,991,910	1,800,543
Derivative Asset
Net Amounts Offset in the Consolidated Statements of Financial Position	3,611	37,468
Derivative Liability
Net Amounts Offset in the Consolidated Statements of Financial Position	0	0
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)	(13,628,545)	(14,124,509)
Gross Amounts Offset in the Consolidated Statements of Financial Position	204,611	131,512
Net Amounts Offset in the Consolidated Statements of Financial Position	(13,423,934)	(13,992,997)
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	15,399,244	15,831,008
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	141,194	201,332
Net Amount	2,116,504	2,039,343
Interest Rate Swaps
Derivative Asset
Gross Amounts of Recognized Assets (Liabilities)	1,092	87,451
Gross Amounts Offset in the Consolidated Statements of Financial Position	(1,092)	(51,653)
Net Amounts Offset in the Consolidated Statements of Financial Position	0	35,798
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	119,469	198,112
Net Amount	119,469	233,910
Derivative Liability
Derivatives	(205,703)	(169,790)
Gross Amounts Offset in the Consolidated Statements of Financial Position	205,703	169,790
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	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	0	0
Treasury Futures
Derivative Asset
Gross Amounts of Recognized Assets (Liabilities)	3,611	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	3,611	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	1,514	3,220
Net Amount	5,125	3,220
Derivative Liability
Derivatives	0	(13,375)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	13,375
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	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	0	0
Swaptions
Derivative Asset
Gross Amounts of Recognized Assets (Liabilities)	0	1,670
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	0	1,670
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	0	1,670
Derivative Liability
Derivatives	0	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	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	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	$ 0	$ 0

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