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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Tables) | 6 Months Ended
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Jun. 30, 2023
SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE AND OTHER SHORT-TERM BORROWINGS |
Schedule of securities sold under agreements to repurchase | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | June 30, 2023 |  |  | December 31, 2022 |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding balance at end of period | ​ | $ | 92,093 | ​ | ​ | $ | 216,956 | ​ | ​
Weighted average interest rate at end of period | ​ |  | 0.43 | % | ​ |  | 0.41 | % | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of securities pledged: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities and U.S. Government agencies | ​ | $ | 92,450 | ​ | ​ | $ | 254,296 | ​ | ​
Total securities pledged | ​ | $ | 92,450 | ​ | ​ | $ | 254,296 | ​ | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​ | ​ | Six Months Ended | ​ | ​ | ​
​ |  | June 30, | ​ | ​ | June 30, | ​ | ​ | ​
(dollars in thousands) |  | 2023 |  | ​ | 2022 |  |  | 2023 |  |  | 2022 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Average outstanding balance during the period |  | $ | 117,852 |  | ​ | $ | 294,388 | ​ | ​ | $ | 160,146 |  | ​ | $ | 297,263 | ​ | ​ | ​
Weighted average interest rate during the period | ​ | ​ | 0.59 | % | ​ | ​ | 0.07 | % | ​ | ​ | 0.53 | % | ​ | ​ | 0.05 | % | ​ | ​
Maximum outstanding at any month end during the period |  | $ | 121,835 |  | ​ | $ | 303,315 | ​ | ​ | $ | 224,067 |  | ​ | $ | 303,315 | ​ | ​ | ​

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- Definition Tabular disclosure of securities financing transactions including resale and repurchase agreements, securities borrowed and lending transactions, securities received as collateral and obligations to return securities received as collateral. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483466/210-20-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-1A + Details
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