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Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Rate |  |  |
Repurchase agreement | $ 400,000 | $ 394,900 |
Carrying amount of the securities pledged to collateralize repurchase agreements | 471,300 | 515,900 |
Federal funds purchased and securities sold under repurchase agreements |  |  |
Amount |  |  |
At period-end | 781,239 | 779,666 | $ 298,741
Average for the year | 877,969 | 553,110 | 282,172
Maximum month-end balance | $ 898,663 | $ 779,666 | $ 321,833
Rate |  |  |
At period-end (as a percent) | 0.12% | 0.17% | 0.90%
Average for the year (as a percent) | 0.14% | 0.35% | 0.93%
Federal funds purchased and securities sold under repurchase agreements | Minimum |  |  |
Information concerning federal funds purchased and securities sold under repurchase agreements |  |  |
Maturity period from the transaction date | 1 day |  |
Federal funds purchased and securities sold under repurchase agreements | Maximum |  |  |
Information concerning federal funds purchased and securities sold under repurchase agreements |  |  |
Maturity period from the transaction date | 3 days |  |
Maturity period as per policies | 9 months |  |

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- Definition Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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