Federal Home Loan Bank Advances and Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Short-Term Debt [Line Items]
Total FHLB advances	$ 3,000,000	$ 3,000,000
Weighted-average contractual interest rates for FHLB advances	3.82%	3.94%
Floating
Short-Term Debt [Line Items]
Total FHLB advances	$ 2,500,000	$ 2,000,000
Fixed
Short-Term Debt [Line Items]
Total FHLB advances	500,000	750,000
Overnight
Short-Term Debt [Line Items]
Total FHLB advances	$ 0	$ 250,000
Minimum | Floating
Short-Term Debt [Line Items]
Interest Rates	3.77%
Minimum | Fixed
Short-Term Debt [Line Items]
Interest Rates	3.87%
Maximum | Floating
Short-Term Debt [Line Items]
Interest Rates	3.87%
Maximum | Fixed
Short-Term Debt [Line Items]
Interest Rates	3.95%
Parent company | Junior Subordinated Debt
Short-Term Debt [Line Items]
Weighted-average rate (as a percent)	5.48%	5.53%
Long-term debt	$ 32,482	$ 32,320