Securities - Carrying Value of Held-to-Maturity Investment Securities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Amortized cost	$ 1,071,911	$ 1,143,548
Net loss on date of transfer from available-for-sale	(13,556)	(13,556)
Allowance for securities credit losses	(1,293)	(1,467)	$ (1,380)	$ (1,609)	$ (1,717)	$ (1,715)
Accretion of net unrealized loss on securities reclassified as held-to-maturity	10,972	10,668
Carrying value	$ 1,068,034	$ 1,139,193