Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	May 26, 2022	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				$ 343,100,000	$ 1,099,000,000.000
Net unrealized holding loss on AFS Securities at date of transfer				(34,800,000)	(46,600,000)
Net unrealized holding losses on AFS Securities, net of tax at date of transfer				$ (26,100)	$ (28,800,000)
Net unamortized, unrealized loss on transfer of securities	$ (39,500,000)		$ (6,300,000)
Net unamortized, unrealized loss on transfer of securities, net of tax	(29,700,000)		(4,700,000)
Credit loss recognized	0		0
Potential credit loss exposure	5,300,000		7,300,000
Securities held to maturity	1,137,754,000		342,537,000
Realized gains or losses on security	0	$ 0
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law	2,546,000,000		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	4,800,000		5,100,000
Securities Held to Maturity [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Accrued interest receivable	2,100,000		670,000
Reserve for credit loss	0		0
Held-to-maturity nonnaccrual	$ 0		$ 0