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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Location and Fair Value of the Company's Derivative Financial Instruments
Information about the balance sheet location and fair value of the Corporation’s derivative instruments is below:
 Interest Rate Swap Contracts
 Asset DerivativesLiability Derivatives
 Balance Sheet LocationFair ValueBalance Sheet LocationFair Value
 (In Thousands)
Derivatives not designated as hedging instruments    
December 31, 2020Accrued interest receivable and other assets$49,377 Accrued interest payable and other liabilities$49,377 
December 31, 2019Accrued interest receivable and other assets$18,346 Accrued interest payable and other liabilities$18,346 
Derivatives designated as hedging instruments
December 31, 2020
Accumulated other comprehensive income (1)
$5,550 Accrued interest payable and other liabilities
$5,550 
December 31, 2019
Accumulated other comprehensive income (1)
$2,539 Accrued interest payable and other liabilities
$2,539