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Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Tables) | 12 Months Ended
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Dec. 31, 2020
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase |
Schedule of information concerning federal funds purchased and securities sold under agreements to repurchase | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ | ​ | 2020 | ​ | 2019 | ​ | 2018 |
(Dollars in thousands) | ​ | Amount | ​ | Rate | ​ | Amount | ​ | Rate | ​ | Amount | ​ | Rate |
At period-end: |  | ​ |  |  |  |  | ​ |  |  |  |  | ​ |  |  |  | ​
Federal funds purchased and securities sold under repurchase agreements | ​ | $ | 779,666 |  | 0.17 | % | $ | 298,741 |  | 0.90 | % | $ | 270,649 |  | 1.08 | %
Average for the year: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal funds purchased and securities sold under repurchase agreements | ​ | $ | 553,110 |  | 0.35 | % | $ | 282,172 |  | 0.93 | % | $ | 312,768 |  | 0.75 | %
Maximum month-end balance: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal funds purchased and securities sold under repurchase agreements | ​ | $ | 779,666 | ​ | ​ | ​ | $ | 321,833 | ​ | ​ | ​ | $ | 362,047 | ​ | ​ | ​

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- Definition Tabular disclosure of securities financing transactions including resale and repurchase agreements, securities borrowed and lending transactions, securities received as collateral and obligations to return securities received as collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225877-175312 + Details
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