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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Fair Value	$ (1,575,000)	$ (127,723,000)
Notional Amount	224,803,000	13,589,356,000
TBAs
Derivative [Line Items]
Notional Amount	0	6,610,000,000
Interest rate futures
Derivative [Line Items]
Notional Amount		226,000,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(1,932,000)	(163,424,000)
Notional Amount	199,932,000	6,929,494,000
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	0	(97,235,000)
Notional Amount	0	2,314,300,000
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Fair Value	0	(51,530,000)
Notional Amount	0	139,500,000
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	0	(13,359,000)
Notional Amount	0	4,160,000,000
Derivative Liabilities | Interest rate futures
Derivative [Line Items]
Fair Value	0	(10,000)
Notional Amount	0	12,300,000
Derivative Liabilities | Loan purchase and interest rate lock commitments
Derivative [Line Items]
Fair Value	(1,932,000)	(1,290,000)
Notional Amount	199,932,000	303,394,000
Derivative Assets
Derivative [Line Items]
Fair Value	357,000	35,701,000
Notional Amount	24,871,000	6,659,862,000
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	0	17,095,000
Notional Amount	0	1,399,000,000
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	0	5,755,000
Notional Amount	0	2,445,000,000
Derivative Assets | Interest rate futures
Derivative [Line Items]
Fair Value	0	777,000
Notional Amount	0	213,700,000
Derivative Assets | Swaptions
Derivative [Line Items]
Fair Value	0	1,925,000
Notional Amount	0	1,065,000,000
Derivative Assets | Loan purchase and interest rate lock commitments
Derivative [Line Items]
Fair Value	357,000	10,149,000
Notional Amount	$ 24,871,000	$ 1,537,162,000

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=121572278&loc=d3e13433-108611

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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=121590274&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=121590274&loc=SL5579245-113959

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