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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Fair Value	$ 23,150,000	$ 37,166,000
Notional Amount	6,861,921,000	11,346,407,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(3,317,000)	(16,072,000)
Notional Amount	1,619,790,000	3,582,153,000
Derivative Assets
Derivative [Line Items]
Fair Value	26,467,000	53,238,000
Notional Amount	5,242,131,000	7,764,254,000
Interest rate agreements | Derivative Liabilities
Derivative [Line Items]
Fair Value	(1,251,000)	0
Notional Amount	283,100,000	0
Interest rate agreements | Derivative Assets
Derivative [Line Items]
Fair Value	611,000	224,000
Notional Amount	161,500,000	42,000,000
TBAs
Derivative [Line Items]
Notional Amount	3,310,000,000	6,630,000,000
TBAs | Derivative Liabilities
Derivative [Line Items]
Fair Value	(658,000)	(15,495,000)
Notional Amount	870,000,000	3,105,000,000
TBAs | Derivative Assets
Derivative [Line Items]
Fair Value	2,880,000	18,260,000
Notional Amount	2,440,000,000	3,520,000,000
Futures
Derivative [Line Items]
Notional Amount	72,000,000
Futures | Derivative Liabilities
Derivative [Line Items]
Fair Value	(905,000)	0
Notional Amount	62,500,000	0
Futures | Derivative Assets
Derivative [Line Items]
Fair Value	25,000	0
Notional Amount	9,000,000	0
Swaptions | Derivative Assets
Derivative [Line Items]
Fair Value	18,318,000	19,727,000
Notional Amount	1,660,000,000	1,585,000,000
Loan purchase and interest rate lock commitments | Derivative Liabilities
Derivative [Line Items]
Fair Value	(503,000)	(577,000)
Notional Amount	404,190,000	477,153,000
Loan purchase and interest rate lock commitments | Derivative Assets
Derivative [Line Items]
Fair Value	4,633,000	15,027,000
Notional Amount	$ 971,631,000	$ 2,617,254,000

X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

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- Definition

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+ References

No definition available.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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