Derivative Financial Instruments Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Derivative asset, fair value	$ 190,003	$ 331,269
Derivative, Collateral, Obligation to Return Securities	(11,822)	(7)
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	178,181	331,262
Derivative liability, gross liability	108,839	165,210
Derivative liability, Collateral, Right to Reclaim Securities	(11,822)	(7)
Derivative liability, Collateral, Right to Reclaim Cash	(96,802)	(165,203)
Derivative liability, Net Amount	215	0
Interest Rate Swap [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	189,960	330,951
Derivative, Collateral, Obligation to Return Securities	(11,779)	(2)
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	178,181	330,949
Derivative liability, gross liability	108,581	165,205
Derivative liability, Collateral, Right to Reclaim Securities	(11,779)	(2)
Derivative liability, Collateral, Right to Reclaim Cash	(96,802)	(165,203)
Derivative liability, Net Amount	0	0
Foreign Exchange Contract [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	43	318
Derivative, Collateral, Obligation to Return Securities	(43)	(5)
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	0	313
Derivative liability, gross liability	258	5
Derivative liability, Collateral, Right to Reclaim Securities	(43)	(5)
Derivative liability, Collateral, Right to Reclaim Cash	0	0
Derivative liability, Net Amount	$ 215	$ 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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