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Short-Term Borrowings | 12 Months Ended
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Dec. 31, 2020
Short-Term Borrowings |
Short-Term Borrowings | NOTE 13 Short-Term Borrowings Short-term borrowings at December 31, 2020, 2019, and 2018 consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended | ​
​ | ​ | December 31, | ​
(dollars in thousands) |  | 2020 |  | 2019 |  | 2018 | ​
Fed funds purchased |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of end of period | ​ | $ | — | ​ | $ | — | ​ | $ | 93,460 | ​
Average daily balance | ​ | ​ | 80 | ​ | ​ | 61,709 | ​ | ​ | 86,768 | ​
Maximum month-end balance | ​ | ​ | — | ​ | ​ | 139,605 | ​ | ​ | 112,260 | ​
Weighted-average rate | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
During period | ​ | ​ | — | % | ​ | 2.54 | % | ​ | 2.18 | %
End of period | ​ | ​ | — | % | ​ | — | % | ​ | 2.63 | %
FHLB Short-term advances | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of end of period | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​
Average daily balance | ​ | ​ | — | ​ | ​ | 9,712 | ​ | ​ | 82 | ​
Maximum month-end balance | ​ | ​ | — | ​ | ​ | 135,000 | ​ | ​ | — | ​
Weighted-average rate | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
During period | ​ | ​ | — | % | ​ | 2.44 | % | ​ | 2.44 | %
End of period | ​ | ​ | — | % | ​ | — | % | ​ | — | %
​ The Company had outstanding credit capacity with the FHLB of $631.7 million and $552.2 million at December 31, 2020 and 2019 respectively, secured by pledged loans and investment securities. The Company also had $87.0 million of unsecured federal funds agreements with correspondent banks with no outstanding balance at December 31, 2020 and 2019. In 2019, the Company established a $15.0 million unsecured line of credit with Bank of North Dakota.

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- Definition The entire disclosure for short-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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