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Financial Derivatives - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Gain expected to be reclassified from AOCI to earnings over next 12 months	$ 5,300,000
Gain (loss) from interest rate swaps designated as cash flow hedges reclassified to earnings	0	$ 0
Investments held as collateral	0	0
Cash posted as collateral		132,129,000
Financial derivatives in net payable position	0	0
Notional amount	15,447,553,000	14,022,179,000
Exchange Cleared
Derivative [Line Items]
Notional amount	12,800,000,000	11,000,000,000.0
Interest Rate Swap
Derivative [Line Items]
Notional amount	15,400,000,000	14,000,000,000.0
Cash
Derivative [Line Items]
Cash held as collateral	1,300,000	2,700,000
Cash posted as collateral	11,200,000	500,000
Available-for-Sale Securities
Derivative [Line Items]
Cash posted as collateral	$ 201,100,000	$ 131,700,000

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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.

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

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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The amount of net gain (loss) reclassified into earnings when interest rate cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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The fair value of collateral received by the entity associated with securities borrowed that must be returned if the counterparty fulfills its obligations. It appears on the balance sheet as a liability and has a corresponding asset that appears on the balance sheet called Securities Received as Collateral.

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