Loans and Leases - Schedule of Performance of Loans Modified in Last 12 Months (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Modified [Line Items]
Total	$ 55	$ 34	$ 27
Current
Financing Receivable, Modified [Line Items]
Total	7	18	8
30 - 89 Past Due
Financing Receivable, Modified [Line Items]
Total	7	0	10
90+ Past Due
Financing Receivable, Modified [Line Items]
Total	41	16	9
Loans held for investment \| Multi-family
Financing Receivable, Modified [Line Items]
Total		2
Loans held for investment \| Multi-family \| Current
Financing Receivable, Modified [Line Items]
Total		2
Loans held for investment \| Multi-family \| 30 - 89 Past Due
Financing Receivable, Modified [Line Items]
Total		0
Loans held for investment \| Multi-family \| 90+ Past Due
Financing Receivable, Modified [Line Items]
Total		0
Loans held for investment \| Commercial real estate
Financing Receivable, Modified [Line Items]
Total	6	12	1
Loans held for investment \| Commercial real estate \| Current
Financing Receivable, Modified [Line Items]
Total	6	8	1
Loans held for investment \| Commercial real estate \| 30 - 89 Past Due
Financing Receivable, Modified [Line Items]
Total	0	0	0
Loans held for investment \| Commercial real estate \| 90+ Past Due
Financing Receivable, Modified [Line Items]
Total	0	4	0
Loans held for investment \| One-to-four family first mortgage
Financing Receivable, Modified [Line Items]
Total	42	16	11
Loans held for investment \| One-to-four family first mortgage \| Current
Financing Receivable, Modified [Line Items]
Total	1	8	3
Loans held for investment \| One-to-four family first mortgage \| 30 - 89 Past Due
Financing Receivable, Modified [Line Items]
Total	0	0	0
Loans held for investment \| One-to-four family first mortgage \| 90+ Past Due
Financing Receivable, Modified [Line Items]
Total	41	8	8
Commercial and industrial \| Commercial and industrial
Financing Receivable, Modified [Line Items]
Total	7	4	13
Commercial and industrial \| Commercial and industrial \| Current
Financing Receivable, Modified [Line Items]
Total	0	0	3
Commercial and industrial \| Commercial and industrial \| 30 - 89 Past Due
Financing Receivable, Modified [Line Items]
Total	7	0	9
Commercial and industrial \| Commercial and industrial \| 90+ Past Due
Financing Receivable, Modified [Line Items]
Total	$ 0	$ 4	1
Commercial and industrial \| Other Consumer
Financing Receivable, Modified [Line Items]
Total			2
Commercial and industrial \| Other Consumer \| Current
Financing Receivable, Modified [Line Items]
Total			1
Commercial and industrial \| Other Consumer \| 30 - 89 Past Due
Financing Receivable, Modified [Line Items]
Total			1
Commercial and industrial \| Other Consumer \| 90+ Past Due
Financing Receivable, Modified [Line Items]
Total			$ 0