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Securities Sold Under Agreements to Repurchase - Schedule of Securities Sold under Agreements to Repurchase and Related Weighted-Average Interest Rates (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Securities Sold under Agreements to Repurchase [Abstract]      
Securities sold under agreements to repurchase $ 375,247,000 $ 399,141,000 $ 431,166,000
Average amount outstanding during the period 396,495,000 355,039,000  
Maximum amount outstanding at any month-end during the period $ 405,278,000 $ 399,141,000  
Weighted average interest rate during period 0.10% 0.27%  
Weighted average interest rate at end of period 0.10% 0.12% 0.12%