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Short-Term Borrowings - Average Balances and Cost of Funds (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Short-term Debt [Line Items] |  |  |
Average Balances | $ 356,853 | $ 123,444 | $ 155,735
Cost of Funds | 1.07% | 2.43% | 2.10%
Federal Home Loan Bank short-term advances |  |  |
Short-term Debt [Line Items] |  |  |
Average Balances | $ 345,601 | $ 114,965 | $ 147,749
Cost of Funds | 1.09% | 2.59% | 2.21%
Federal funds purchased |  |  |
Short-term Debt [Line Items] |  |  |
Average Balances | $ 363 | $ 0 | $ 0
Cost of Funds | 0.00% | 0.00% | 0.00%
Securities sold under agreements to repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Average Balances | $ 10,889 | $ 8,479 | $ 7,986
Cost of Funds | 0.30% | 0.15% | 0.17%

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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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