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Securities Sold Under Repurchase Agreements (Tables) | 12 Months Ended
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Dec. 31, 2021
Schedule of repurchase agreements | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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, 2021 term: |  | ​ |  |  | ​ |  |  | ​ |  |  |  | ​
Overnight agreements | ​ | $ | 500,495 | ​ | $ | 492,026 | ​ | $ | 428,235 |  | 0.16 | %
1 to 29 days | ​ |  | — | ​ |  | — | ​ |  | — |  | — | ​
30 to 90 days | ​ |  | — | ​ |  | — | ​ |  | — |  | — | ​
Over 90 days | ​ |  | 11,452 | ​ |  | 11,229 | ​ |  | 11,437 |  | 0.48 | ​
Total | ​ | $ | 511,947 | ​ | $ | 503,255 | ​ | $ | 439,672 |  | 0.17 | %
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 | %

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- Definition The entire disclosure for repurchase agreements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration