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Securities - Carrying Value of Held-to-Maturity Investment Securities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Amortized cost $ 877,613 $ 772,975
Net loss on date of transfer from available-for-sale (13,347) (13,347)
Allowance for credit loss (2,393) 0
Accretion of net unrealized loss on securities reclassified as held-to-maturity 9,815 9,245
Carrying value $ 871,688 $ 768,873