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Derivative Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of notional amounts and estimated fair values of interest rate derivative contracts
The following table presents the notional amounts and estimated fair values of interest rate derivative contracts outstanding at September 30, 2021 and December 31, 2020:
September 30, 2021December 31, 2020
Notional AmountsEstimated Fair ValueNotional AmountsEstimated Fair Value
(In thousands)
Non-hedging interest rate derivatives
Interest rate swap asset (1)
$323,706 $17,843 $308,126 $25,740 
Interest rate swap liability (1)
323,706 (17,970)308,126 (26,162)
 (1) The estimated fair value of derivatives with customers was $13.0 million and $25.4 million as of September 30, 2021 and December 31, 2020, respectively. The estimated fair value of derivatives with third parties was $(13.2) million and $(25.9) million as of September 30, 2021 and December 31, 2020, respectively.