Derivatives And Hedging Activities (Fair Values of Derivatives Instruments) (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		$ 48,853,045	$ 51,533,807
TOTAL, Derivative Assets		152,354	139,255
TOTAL, Derivative Liabilities		356,807	410,752
Netting adjustments and cash collateral, Derivative Assets	[1],[2]	164,176	211,112
Netting adjustments and cash collateral, Derivative Liabilities	[1],[2]	(355,856)	(409,892)
DERIVATIVE ASSETS		316,530	350,367
DERIVATIVE LIABILITIES		951	860
Cash collateral posted		581,618	649,456
Cash collateral received		61,586	28,452
Derivatives designated as hedging instruments: [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		40,379,766	44,804,870
TOTAL, Derivative Assets		128,645	116,352
TOTAL, Derivative Liabilities		356,687	410,595
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		8,473,279	6,728,937
TOTAL, Derivative Assets		23,709	22,903
TOTAL, Derivative Liabilities		120	157
Interest rate swaps [Member] | Derivatives designated as hedging instruments: [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		40,379,766
Interest rate swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		6,607,099	6,383,296
TOTAL, Derivative Assets		19,451	22,072
TOTAL, Derivative Liabilities		90	152
Interest rate caps/floors [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		1,804,000	304,000
TOTAL, Derivative Assets		4,194	698
TOTAL, Derivative Liabilities		0	0
Mortgage delivery commitments [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		62,180	41,641
TOTAL, Derivative Assets		64	133
TOTAL, Derivative Liabilities		$ 30	$ 5

[1] Amounts represent the application of the netting requirements that allow FHLBank to settle positive and negative positions and cash collateral, including accrued interest, held or placed with the same clearing agent and/or derivative counterparty. Cash collateral posted was $581,618,000 and $649,456,000 as of June 30, 2024 and December 31, 2023, respectively. Cash collateral received was $61,586,000 and $28,452,000 as of June 30, 2024 and December 31, 2023, respectively.

[2] Represents the effect of legally enforceable master netting agreements that allow FHLBank to net settle positive and negative positions and also derivative cash collateral, including related accrued interest, held or placed with the same clearing agent or derivative counterparty.