Investment Securities (Components Of Investment Securities) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Schedule of Investments [Line Items]
Debt Securities, Trading	$ 84,323,000		$ 78,315,000
Debt Securities, Trading and Available-for-sale	$ 87,381,000		81,719,000
Future Prepayment Rate Assumption Of Investment Portfolio	8.60%	9.60%
Mortgage Credit Investment Fund Limited Partnership	$ 70,000		70,000
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading	15,000		15,000
Debt Securities, Trading and Available-for-sale	15,000		15,000
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading	9,000		10,000
Debt Securities, Trading and Available-for-sale	9,000		10,000
Credit Risk Transfer Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading	573,000		606,000
Debt Securities, Trading and Available-for-sale	573,000		606,000
Agency Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading	83,726,000		77,684,000
Debt Securities, Trading and Available-for-sale	86,784,000		81,088,000
Available-for-sale Securities [Member]
Schedule of Investments [Line Items]
Available For Sale Securities Par	3,210,000		3,517,000
Debt Securities, Available-for-Sale, Unamortized discount	0		0
Debt Securities, Available-for-Sale, Unamortized premium	186,000		210,000
Debt Securities, Available-for-sale, Amortized Cost	3,396,000		3,727,000
Debt Securities, Available-for-Sale, Gross Unrealized Losses	338,000		323,000
Debt Securities, Available-for-Sale	3,058,000		3,404,000
Debt Securities, Available-for-Sale, Gross Unrealized Gains	0		0
Available-for-sale Securities [Member] \| Agency Securities [Member]
Schedule of Investments [Line Items]
Available For Sale Securities Par	3,210,000		3,517,000
Debt Securities, Available-for-Sale, Unamortized discount	0		0
Debt Securities, Available-for-Sale, Unamortized premium	186,000		210,000
Debt Securities, Available-for-sale, Amortized Cost	3,396,000		3,727,000
Debt Securities, Available-for-Sale, Gross Unrealized Losses	338,000		323,000
Debt Securities, Available-for-Sale	3,058,000		3,404,000
Debt Securities, Available-for-Sale, Gross Unrealized Gains	0		0
Trading Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading Securities, Gross Unrealized Gains	557,000		1,175,000
Debt Securities, Trading Securities, Gross Unrealized Losses	1,309,000		950,000
Trading Securities Par	84,686,000		77,313,000
Debt Securities, Trading Securities, Unamortized discount	776,000		534,000
Debt Securities, Trading Securities, Unamortized Premium	1,165,000		1,311,000
Debt Securities, Trading, Amortized Cost	85,075,000		78,090,000
Trading Securities [Member] \| Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading Securities, Gross Unrealized Gains	1,000		1,000
Debt Securities, Trading Securities, Gross Unrealized Losses	2,000		2,000
Trading Securities Par	18,000		18,000
Debt Securities, Trading Securities, Unamortized discount	3,000		3,000
Debt Securities, Trading Securities, Unamortized Premium	1,000		1,000
Debt Securities, Trading, Amortized Cost	16,000		16,000
Trading Securities [Member] \| Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading Securities, Gross Unrealized Gains	0		0
Debt Securities, Trading Securities, Gross Unrealized Losses	1,000		1,000
Trading Securities Par	11,000		11,000
Debt Securities, Trading Securities, Unamortized discount	1,000		0
Debt Securities, Trading Securities, Unamortized Premium	0		0
Debt Securities, Trading, Amortized Cost	10,000		11,000
Trading Securities [Member] \| Credit Risk Transfer Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading Securities, Gross Unrealized Gains	38,000		45,000
Debt Securities, Trading Securities, Gross Unrealized Losses	0		0
Trading Securities Par	530,000		555,000
Debt Securities, Trading Securities, Unamortized discount	8,000		10,000
Debt Securities, Trading Securities, Unamortized Premium	13,000		16,000
Debt Securities, Trading, Amortized Cost	535,000		561,000
Trading Securities [Member] \| Agency Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading Securities, Gross Unrealized Gains	518,000		1,129,000
Debt Securities, Trading Securities, Gross Unrealized Losses	1,306,000		947,000
Trading Securities Par	84,127,000		76,729,000
Debt Securities, Trading Securities, Unamortized discount	764,000		521,000
Debt Securities, Trading Securities, Unamortized Premium	1,151,000		1,294,000
Debt Securities, Trading, Amortized Cost	84,514,000		77,502,000
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading and Available-for-sale	15,000		15,000
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading and Available-for-sale	9,000		10,000
Credit Risk Transfer Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading and Available-for-sale	573,000		606,000
Credit Risk Transfer Securities [Member] \| Securities Remeasured at Fair Value [Member]
Schedule of Investments [Line Items]
Debt Securities, Trading and Available-for-sale	573,000		606,000
Non-Agency [Member] \| Trading Securities [Member] \| Interest-Only-Strip
Schedule of Investments [Line Items]
Trading Securities Par	$ 16,000		$ 16,000

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