Derivatives (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Notional amount of derivatives	$ 8,710,799	$ 8,649,657
Fair value liability	3,100	4,100
Credit risk-related contingent features, net liability position	800	49,400
Credit risk-related contingent features, posted collateral	900	15,000
Derivatives Designated as Hedging Instruments [Member]
Derivative [Line Items]
Notional amount of derivatives	3,034,400	2,962,650
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member]
Derivative [Line Items]
Amortization of accumulated other comprehensive loss on terminated cash flow hedges	23,700
Notional amount of derivatives	100,000
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member] \| Swap Agreement 1, Expires 2022 [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 325,000
Derivative maturity expiration year	2022
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member] \| Swap Agreement 2, Expires 2023 [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 150,000
Derivative maturity expiration year	2023
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member] \| Swap Agreement 3, Expires 2026 [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 250,000
Derivative maturity expiration year	2026
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member] \| Swap Agreement 4, Expires 2027 [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 925,000
Derivative maturity expiration year	2027
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Amortization of accumulated other comprehensive loss on terminated cash flow hedges	$ 49,200
Basis adjustment associated with hedged items	62,800
Interest Rate Swaps - Securities [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Notional amount of derivatives	1,284,400	$ 1,837,650
Derivative hedged item	1,100,000
Interest Rate Swaps - Securities [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Fair Value Hedging [Member] \| Commercial Mortgage-Backed Securities [Member]
Derivative [Line Items]
Amortized cost basis of closed portfolio of pre-payable securities	$ 1,400,000

Derivative, Maturity Year

No definition available.

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
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- Definition

Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

+ References

No definition available.

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- 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

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959

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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
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-Name Accounting Standards Codification
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- Definition

Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, in last-of-layer hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EEE
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999718-113959

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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- Definition

Amortized cost of closed portfolio of prepayable financial asset, used to designate hedging relationship in which hedged item is last layer expected to be remaining at end of hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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- Definition

Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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