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Repurchase Agreements and Other Borrowings - Schedule of Securities Underlying the Repurchase Agreements (Details) - Securities Sold under Agreements to Repurchase - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Short Term Debt [Line Items] |  |  |
Maximum outstanding at any month-end | $ 350,288 | $ 208,109 | $ 192,330
Average amount outstanding for the year | $ 219,298 | $ 169,437 | $ 140,622

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