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Securities Sold Under Agreements to Repurchase (Tables) | 12 Months Ended
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Dec. 31, 2019
Brokers And Dealers [Abstract] |
Summary of Securities Pledged as Collateral Under Repurchase Agreements | The following table presents detail regarding the securities pledged as collateral under repurchase agreements as of December 31, 2019 and 2018. All of the repurchase agreements are overnight agreements.
|  | December 31, 2019 |  |  | December 31, 2018 |
Securities pledged for repurchase agreements: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 810 |  |  | $ | 861 |
Obligations of U.S. government agencies |  |  | 17,864 |  |  |  | 21,338 |
Total securities pledged |  | $ | 18,674 |  |  | $ | 22,199 |
Gross amount of recognized liabilities for repurchase agreements |  | $ | 18,674 |  |  | $ | 22,199 |
Amounts related to agreements not included in offsetting disclosures above |  | $ | — |  |  | $ | — |
Schedule of Securities Sold Under Agreements to Repurchase | Information concerning securities sold under agreements to repurchase was as follows:
|  | 2019 |  |  | 2018 |  |  | 2017 |
Outstanding balance at year end |  | $ | 18,674 |  |  | $ | 22,199 |  |  | $ | 21,755 |
Average balance during the year |  |  | 18,321 |  |  |  | 18,456 |  |  |  | 18,234 |
Average interest rate during the year |  |  | 0.10 | % |  |  | 0.10 | % |  |  | 0.10 | %
Maximum month-end balance during the year |  | $ | 21,970 |  |  | $ | 22,199 |  |  | $ | 23,889 |
Weighted average interest rate at year end |  |  | 0.10 | % |  |  | 0.10 | % |  |  | 0.10 | %

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