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Borrowings (Tables) | 3 Months Ended
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Mar. 31, 2021
Borrowings |
Schedule of distribution of securities sold under agreements to repurchase and short-term borrowings and weighted average interest rates | Securities sold under agreements to repurchase were as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of | ​
​ | ​ | March 31, | ​ | December 31, | ​
​ |  | 2021 |  | 2020 |
Securities sold under agreements to repurchase | ​ | $ | 210,132 | ​ | $ | 175,614 | ​
Weighted average rate for securities sold under agreements to repurchase | ​ | ​ | 0.11 | % | ​ | 0.13 | %
Summary of long-term debt | Long-term debt is summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of
​ | ​ | March 31, | ​ | December 31,
​ |  | 2021 |  | 2020
Notes payable, FHLB, original maturity of 5 years, collateralized by FHLB deposits, residential and commercial real estate loans and FHLB stock | ​ | $ | 4,584 | ​ | $ | 4,757
Schedule of unamortized debt issuance cost | Unamortized debt issuance costs related to senior notes and subordinated notes are presented in the following table (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of
​ | ​ | March 31, | ​ | December 31,
​ |  | 2021 |  | 2020
Unamortized debt issuance costs related to: | ​ | ​ | ​ | ​ | ​ | ​
Senior notes issued in 2017 | ​ | $ | 157 | ​ | $ | 191
Subordinated notes issued in 2017 | ​ | ​ | 625 | ​ | ​ | 651
Subordinated notes issued in 2020 | ​ | ​ | 2,005 | ​ | ​ | 2,123
Total unamortized debt issuance costs | ​ | $ | 2,787 | ​ | $ | 2,965

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