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Borrowings - Short-term Borrowings (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Balance outstanding at year end | $ 58,223,000 | $ 36,592,000
Maximum balance at any month end during the year | 145,579,000 | 38,051,000
Average balance for the year | $ 96,882,000 | $ 35,630,000
Weighted average rate for the year (as a percent) | 3.79% | 0.51%
Weighted average rate on borrowings at year end | 3.00% | 0.97%
Estimated fair value at year end | $ 55,732,000 | $ 33,616,000
Customers |  |
Balance outstanding at year end | 30,710,000 | 34,480,000
Federal Reserve Bank |  |
Balance outstanding at year end | 27,500,000 | $ 2,110,000
Overnight borrowings | Federal Reserve Bank |  |
Balance outstanding at year end | $ 18,000 |

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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481372/852-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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