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Derivative Financial Instruments, Agency Business (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) item	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) item	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) item
Derivative Financial Instruments
Notional Value, classified in Other Assets	$ 308,421		$ 308,421		$ 865,975
Notional Value, classified in Other Liabilities	36,198		36,198		319,142
Net (losses) gains from changes in the fair value of derivatives	(9,900)	$ 4,100	1,200	$ 4,200
(Loss) gain on derivative instruments	(2,607)	(7,368)	(5,828)	(58,099)
Other Income
Derivative Financial Instruments
(Loss) gain on derivative instruments	26,300	32,400	$ 63,200	54,400
Swap Futures
Derivative Financial Instruments
Derivative, maturity term			3 months
Swap Futures | Minimum
Derivative Financial Instruments
Derivative Swap Rate Period			5 years
Swap Futures | Maximum
Derivative Financial Instruments
Derivative Swap Rate Period			10 years
Swap Futures | Agency Business | Other Income
Derivative Financial Instruments
Realized gain (loss) on derivatives	9,400	11,200	$ (200)	57,300
Unrealized gain on derivatives	3,000	8,200		1,600
Swap Futures | Structured Business | Other Income
Derivative Financial Instruments
Realized gain (loss) on derivatives			(6,500)	2,800
Unrealized gain on derivatives		$ 100	(400)	$ 500
Non-Qualifying | Agency Business
Derivative Financial Instruments
Notional Value, classified in Other Assets	564,219		564,219		1,230,417
Fair Value, classified in Other Assets	2,387		2,387		3,892
Fair Value, classified in Other Liabilities	$ (393)		$ (393)		$ (1,221)
Non-Qualifying | Rate lock commitments | Agency Business
Derivative Financial Instruments
Count | item	5		5		7
Notional Value, classified in Other Assets	$ 16,550		$ 16,550		$ 136,354
Fair Value, classified in Other Assets	124		124		1,967
Fair Value, classified in Other Liabilities	$ (127)		$ (127)		$ (231)
Non-Qualifying | Forward Sale Commitments | Agency Business
Derivative Financial Instruments
Count | item	43		43		114
Notional Value, classified in Other Assets	$ 328,069		$ 328,069		$ 1,048,763
Fair Value, classified in Other Assets	2,263		2,263		1,925
Fair Value, classified in Other Liabilities	$ (266)		$ (266)		$ (990)
Non-Qualifying | Swap Futures | Agency Business
Derivative Financial Instruments
Count | item	2,196		2,196		453
Notional Value, classified in Other Assets	$ 219,600		$ 219,600		$ 45,300

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Nominal or face amount used to calculate payments on the derivative asset.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Nominal or face amount used to calculate payments on the derivative liability.

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The number of derivative instruments of a particular group held by the entity.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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