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Securities Sold Under Agreements to Repurchase (Tables)
9 Months Ended
Sep. 30, 2021
Securities Sold under Agreements to Repurchase [Abstract]  
Schedule of Securities Sold Under Agreements to Repurchase and Weighted-Average Interest Rates The following table presents securities sold under agreements to repurchase and related weighted-average interest rates:
At or for the
Nine Months
Ended
September 30,
2021
At
December 31,
2020
At or for the
Nine Months
Ended
September 30,
2020
(dollars in thousands)
Outstanding at period end$375,247 $431,166 $399,141 
Average amount outstanding during the period396,495 N/A355,039 
Maximum amount outstanding at any month-end during the period405,278 N/A399,141 
Weighted-average interest rate:
During the period0.10 %N/A0.27 %
At period end0.10 %0.12 %0.12 %
Schedule of Remaining Contractual Maturity of Secured Borrowings and Class of Collateral Pledged Under Repurchase Agreements
The following table presents the contractual maturity of our secured borrowings and class of collateral pledged:
 At September 30, 2021
 Remaining Contractual Maturity of the Agreements
(dollars in thousands)Overnight and ContinuousUp to
30 Days
 30-90 DaysGreater Than 90 daysTotal
Repurchase Agreements:     
U.S. Treasury and agency securities$375,247 $ $ $ $375,247 
Total$375,247 $ $ $ $375,247