Securities - Carrying Value of Held-to-Maturity Investment Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Amortized cost	$ 1,031,383	$ 1,143,548
Net loss on date of transfer from available-for-sale	(13,556)	(13,556)
Allowance for securities credit losses	(1,234)	(1,467)	$ (1,293)	$ (1,503)	$ (1,609)	$ (1,715)
Accretion of net unrealized loss on securities reclassified as held-to-maturity	11,119	10,668
Carrying value	$ 1,027,712	$ 1,139,193