Deposits - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Deposit Liability [Line Items]
Time deposits greater than $250,000	$ 89,300		$ 89,300		$ 85,500
Demand deposit overdrafts reclassified as loans	5,600		5,600		3,700
State and municipal deposits	597,400		597,400
Total deposits	17,950,431		17,950,431		18,156,953
Asset Pledged as Collateral
Deposit Liability [Line Items]
Available borrowing capacity through FHLB	600,500		600,500
Discontinued Operations | BankMobile Technologies, Inc.
Deposit Liability [Line Items]
Expenses under the deposit servicing agreement	7,300	$ 15,900	14,900	$ 33,700
Total deposits	$ 847,700		$ 847,700		$ 1,100,000