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Loans and Leases - Summary of Financial Effects of Troubled Debt Restructurings (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Investment	Dec. 31, 2021 USD ($) Investment	Dec. 31, 2020 USD ($) Investment
Financing Receivable Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment	2	3	43
Pre-Modification Recorded Investment	$ 22	$ 12	$ 24
Post-Modification Recorded Investment	19	$ 12	23
Trouble debt restructuring, charge-off amount	$ 3		$ 1
Commercial Real Estate
Financing Receivable Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment	2	2
Pre-Modification Recorded Investment	$ 22	$ 4
Post-Modification Recorded Investment	$ 19	$ 4
Weighted Average Interest Rate, Pre-Modification	6.00%	6.00%
Weighted Average Interest Rate, Post-Modification	4.02%	3.55%
Trouble debt restructuring, charge-off amount	$ 3
Commercial and Industrial
Financing Receivable Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment		1	42
Pre-Modification Recorded Investment		$ 8	$ 9
Post-Modification Recorded Investment		$ 8	$ 8
Weighted Average Interest Rate, Pre-Modification		3.13%	2.36%
Weighted Average Interest Rate, Post-Modification		3.25%	2.23%
Trouble debt restructuring, charge-off amount			$ 1
One-to-Four Family First Mortgage
Financing Receivable Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment			1
Pre-Modification Recorded Investment			$ 15
Post-Modification Recorded Investment			$ 15
Weighted Average Interest Rate, Pre-Modification			8.00%
Weighted Average Interest Rate, Post-Modification			3.50%

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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Amount, before troubled debt restructuring, of financing receivable to be modified.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
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