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Securities Sold Under Repurchase Agreements | 12 Months Ended
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Dec. 31, 2020
Securities Sold Under Repurchase Agreements | (8) Securities Sold Under Repurchase Agreements Our Subsidiary Banks have entered into repurchase agreements with individual customers of the Subsidiary Banks. The purchasers have agreed to resell to the Subsidiary Banks identical securities upon the maturities of the agreements. Securities sold under repurchase agreements were mortgage-backed securities and averaged $335,392,000 and $267,439,000 during 2020 and 2019, respectively, and the maximum amount outstanding at any month end during 2020 and 2019 was $428,148,000 and $299,827,000 respectively. Further information related to repurchase agreements at December 31, 2020 and 2019 is set forth in the following table: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Collateral Securities | ​ | Repurchase Borrowing |
​ | ​ | Book Value of | ​ | Fair Value of | ​ | Balance of | ​ | Weighted Average |
​ | ​ | Securities Sold | ​ | Securities Sold | ​ | Liability | ​ | Interest Rate |
​ | ​ | (Dollars in Thousands) |
December 31, 2020 term: |  | ​ |  |  | ​ |  |  | ​ |  |  |  | ​
Overnight agreements | ​ | $ | 506,020 | ​ | $ | 507,164 | ​ | $ | 416,757 |  | 0.13 | %
1 to 29 days | ​ |  | — | ​ |  | — | ​ |  | — |  | — | ​
30 to 90 days | ​ |  | — | ​ |  | — | ​ |  | — |  | — | ​
Over 90 days | ​ |  | 11,684 | ​ |  | 11,641 | ​ |  | 11,391 |  | 0.43 | ​
Total | ​ | $ | 517,704 | ​ | $ | 518,805 | ​ | $ | 428,148 |  | 0.14 | %
December 31, 2019 term: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Overnight agreements | ​ | $ | 317,107 | ​ | $ | 318,397 | ​ | $ | 225,243 |  | 0.87 | %
1 to 29 days | ​ |  | — | ​ |  | — | ​ |  | — |  | — | ​
30 to 90 days | ​ |  | — | ​ |  | — | ​ |  | — |  | — | ​
Over 90 days | ​ |  | 11,564 | ​ |  | 11,529 | ​ |  | 11,293 |  | 1.28 | ​
Total | ​ | $ | 328,671 | ​ | $ | 329,926 | ​ | $ | 236,536 |  | 0.89 | %
​ The book value and fair value of securities sold includes the entire book value and fair value of securities partially or fully pledged under repurchase agreements.

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- Definition The entire disclosure for repurchase agreements (also known as repos), resale agreements (also known as reverse repurchase agreements or reverse repos), securities borrowed transactions, and securities loaned transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -URI http://asc.fasb.org/topic&trid=2197590 + Details
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Namespace Prefix: | us-gaap_
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