Securities Available for Sale - Proceeds and Gross Realized Gains and Losses from Sales of Other Securities Available for Sale (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Proceeds	[1]	$ 106,192	$ 2,396
Gross realized gains		708	3
Gross realized losses		$ (952)	$ (4)

[1] Prior period amounts have been reclassified to conform to the current period presentation. See “Notes to Condensed Consolidated Financial Statements – Note 1. Summary of Significant Accounting Policies” for additional information.