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Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Customers
Derivative Asset
Estimated Fair Value	$ 9,500	$ 25,400
Third Parties
Derivative Asset
Estimated Fair Value		(25,900)
Derivative Liability
Estimated Fair Value	(9,700)
Interest rate swap
Derivative Asset
Estimated Fair Value	16,955
Derivative Liability
Estimated Fair Value	(17,133)
Interest rate swap | Non-hedging interest rate derivatives
Derivative Asset
Notional Amounts	315,681	308,126
Estimated Fair Value		25,740
Derivative Liability
Notional Amounts	$ 315,681	308,126
Estimated Fair Value		$ (26,162)

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
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