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Deposits - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Deposit Liability [Line Items]
Time deposits greater than $250,000	$ 61,100		$ 85,500
Brokered demand deposits	755,400		553,200
Brokered money market deposits	10,400		415,700
Brokered certificates of deposit	5,300,000		4,000,000
Demand deposit overdrafts reclassified as loans	2,400		3,700
Total deposits	17,723,617		18,156,953
Discontinued Operations | BankMobile Technologies, Inc.
Deposit Liability [Line Items]
Expenses under the deposit servicing agreement	7,600	$ 17,800
Total deposits	$ 1,100,000		$ 1,100,000

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- Definition

Brokered Demand Deposits

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- Definition

Amount of brokered money market accounts.

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- Definition

Certificates of deposit brokered.

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- Definition

Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

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-SubTopic 210
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Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

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