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Derivative Financial Instruments | 3 Months Ended
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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, 2021 |  | December 31, 2020
| Notional Amounts |  | Estimated Fair Value |  | Notional Amounts |  | Estimated 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.

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- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -URI http://asc.fasb.org/topic&trid=2229140 + Details
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