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Securities Sold Under Reverse Repurchase Agreements and Short-term Borrowings - Schedule of Repurchase Agreements (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Overnight and Continuous | Agency mortgage-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral $ 140,666 $ 164,174