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Derivative Financial Instruments
 3 Months Ended
Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Financial Instruments Derivative Financial Instruments
The Bank has entered into certain interest rate swap contracts that are not designated as hedging instruments. The following table presents the notional amounts and estimated fair values of interest rate derivative contracts outstanding at March 31, 2021 and December 31, 2020:
March 31, 2021December 31, 2020
Notional AmountsEstimated Fair ValueNotional AmountsEstimated Fair Value
(In thousands)
Non-hedging interest rate derivatives
Interest rate swap asset (1)
$315,681 $16,955 $308,126 $25,740 
Interest rate swap liability (1)
315,681 (17,133)308,126 (26,162)
 (1) The estimated fair value of derivatives with customers was $9.5 million and $25.4 million as of March 31, 2021 and December 31, 2020, respectively. The estimated fair value of derivatives with third parties was $(9.7) million and $(25.9) million as of March 31, 2021 and December 31, 2020, respectively.

Credit risk for derivatives with customers is concentrated within our primary market areas. Credit risk for derivatives with third-parties is concentrated among four well-known broker dealers.