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Securities - Carrying Value of Held-to-Maturity Investment Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Amortized cost $ 942,314 $ 772,975
Net loss on date of transfer from available-for-sale (13,347) (13,347)
Allowance for credit loss (1,715) 0
Accretion of net unrealized loss on securities reclassified as held-to-maturity 10,001 9,245
Carrying value $ 937,253 $ 768,873