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Committed Lines of Credit | 3 Months Ended
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Mar. 31, 2018
Short-term Debt [Abstract] |
Committed Lines of Credit | COMMITTED LINES OF CREDIT Avista Corp. Avista Corp. has a committed line of credit with various financial institutions in the total amount of $400.0 million that expires in April 2021. The committed line of credit is secured by non-transferable first mortgage bonds of the Company issued to the agent bank that would only become due and payable in the event, and then only to the extent, that the Company defaults on its obligations under the committed line of credit. Balances outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed line of credit were as follows as of March 31, 2018 and December 31, 2017 (dollars in thousands):
| March 31, |  | December 31,
| 2018 |  | 2017
Balance outstanding at end of period (1) | $ | 50,000 |  |  | $ | 105,000 |
Letters of credit outstanding at end of period | $ | 35,420 |  |  | $ | 34,420 |
Average interest rate at end of period | 2.56 | % |  | 2.26 | %
(1) | As of March 31, 2018 and December 31, 2017, the balance outstanding was classified as short-term borrowings on the Condensed Consolidated Balance Sheet.
AEL&P AEL&P has a committed line of credit in the amount of $25.0 million that expires in November 2019. As of March 31, 2018 and December 31, 2017, there were no borrowings or letters of credit outstanding under this committed line of credit. The committed line of credit is secured by non-transferable first mortgage bonds of AEL&P issued to the agent bank that would only become due and payable in the event, and then only to the extent, that AEL&P defaults on its obligations under the committed line of credit.

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- Definition The entire disclosure for short-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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