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Notes Payable and Amounts Due Under Repurchase Agreements (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Notes Payable
Notes payable includes the following:
December 31,
20202019
(Dollars in thousands)
Senior notes due 2027
Principal$500,000 $500,000 
Unamortized debt issue costs(4,086)(4,607)
Unamortized discount(246)(277)
$495,668 $495,116