Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2013
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Reclassification of Securities available for sale to securities held to maturity	$ 766,000,000.0			$ 1,099,000,000.000
Net unrealized holding loss on AFS Securities at date of transfer	(91,900,000)			(46,600,000)
Net unrealized holding losses on AFS Securities, net of tax at date of transfer	(68,900,000)			$ (28,800,000)
Net unamortized, unrealized loss on transfer of securities	(92,300,000)	$ (6,300,000)
Net unamortized, unrealized loss on transfer of securities, net of tax	(69,200,000)	(4,700,000)
Credit loss recognized	0	0
Potential credit loss exposure	4,500,000	7,300,000
Securities held to maturity	1,494,514,000	342,537,000
Realized gains or losses on security	0	0	$ 0
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law	2,693,000,000	2,831,000,000
Pledged securities providing additional contingency funding	0	0
30 Days or More Past Due [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities held to maturity	0	0
Securities Available for Sale [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Accrued interest receivable	4,000,000.0	5,100,000
Securities Held to Maturity [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Accrued interest receivable	2,700,000	670,000
Reserve for credit loss	0	0
Held-to-maturity nonnaccrual	$ 0	$ 0