Derivative Financial Instruments Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Derivative asset, fair value	$ 186,886	$ 331,269
Derivative, Collateral, Obligation to Return Securities	(4,231)	(7)
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	182,655	331,262
Derivative liability, gross liability	97,302	165,210
Derivative liability, Collateral, Right to Reclaim Securities	(4,004)	(7)
Derivative liability, Collateral, Right to Reclaim Cash	(90,620)	(165,203)
Derivative liability, Net Amount	2,678	0
Interest Rate Swap [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	186,860	330,951
Derivative, Collateral, Obligation to Return Securities	(4,205)	(2)
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	182,655	330,949
Derivative liability, gross liability	97,018	165,205
Derivative liability, Collateral, Right to Reclaim Securities	(3,978)	(2)
Derivative liability, Collateral, Right to Reclaim Cash	(90,620)	(165,203)
Derivative liability, Net Amount	2,420	0
Foreign Exchange Contract [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	26	318
Derivative, Collateral, Obligation to Return Securities	(26)	(5)
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	0	313
Derivative liability, gross liability	284	5
Derivative liability, Collateral, Right to Reclaim Securities	(26)	(5)
Derivative liability, Collateral, Right to Reclaim Cash	0	0
Derivative liability, Net Amount	$ 258	$ 0

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

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after effects of master netting arrangements, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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