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Derivative Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
Information about the balance sheet location and fair value of the Corporation’s derivative instruments below:
 Interest Rate Swap Contracts
Asset DerivativesLiability Derivatives
 Balance Sheet LocationFair ValueBalance Sheet LocationFair Value
 (In Thousands)
Derivatives not designated as hedging instruments    
September 30, 2021Derivatives$28,678 Derivatives$28,678 
December 31, 2020Derivatives$49,377 Derivatives$49,377 
Derivatives designated as hedging instruments    
September 30, 2021
Accumulated other comprehensive income (1)
$3,212 Derivatives$3,212 
December 31, 2020
Accumulated other comprehensive income (1)
$5,550 Derivatives$5,550