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Derivative Instruments - Non-hedge Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Sep. 30, 2019
Derivative [Line Items]
Notional Amount						$ 1,300,000
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	$ 3,053,030		$ 3,053,030		$ 2,592,778
Estimated Fair Value	(1,345)		(1,345)		$ (208)
Derivative, Gain (Loss) on Derivative, Net	(794)	$ (89)	$ (1,137)	$ (102)
Not Designated as Hedging Instrument | Assets
Derivative [Line Items]
Description of Location of Interest Rate Derivatives on Balance Sheet			Other assets		Other assets
Notional Amount	1,526,515		$ 1,526,515		$ 1,296,389
Estimated Fair Value	122,073		$ 122,073		$ 43,507
Not Designated as Hedging Instrument | Liabilities
Derivative [Line Items]
Description of Location of Interest Rate Derivatives on Balance Sheet			Other liabilities		Other liabilities
Notional Amount	1,526,515		$ 1,526,515		$ 1,296,389
Estimated Fair Value	$ (123,418)		$ (123,418)		$ (43,715)

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

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+ References

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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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- Definition

Description of where the interest rate derivatives are reported in the balance sheet.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c),(d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

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- Definition

Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

+ References

No definition available.

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