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Derivative Financial Instruments - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Interest rate swaps, notional amount	$ 1,534,520	$ 1,481,109
Interest rate swaps, net carrying value	(25,803)	(59,668)
Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount	308,400	316,100
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest rate swaps, notional amount	996,500	1,021,500
Not Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount	229,700	143,600
Interest Rate Swaps 1 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest rate swaps, notional amount	355,000
Interest rate swaps, net carrying value	4,168
Interest Rate Swaps 1 [Member] | Not Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount	114,835	62,779
Interest rate swaps, net carrying value	3,225	1,319
Interest Rate Swaps 2 [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Interest rate swaps, notional amount	308,350	316,051
Interest rate swaps, net carrying value	(15,296)	(28,689)
Interest Rate Swap [Member]
Interest rate swaps, notional amount	308,400	316,100
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest rate swaps, notional amount	641,500	1,021,500
Interest rate swaps, net carrying value	(14,675)	(25,300)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount	114,835	80,779
Interest rate swaps, net carrying value	$ (3,225)	$ (6,998)

X

- Definition

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

+ References

Reference 1: 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

Reference 2: 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 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

+ Details

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X

- 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.

+ Details

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