Debt and Equity Securities - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Available-for-sale debt securities:
Amortized Cost	$ 3,980,545	$ 3,998,939
Gross Unrealized Gains	27,355	44,592
Gross Unrealized Losses	(94,045)	(92,076)
Estimated Fair Value	3,913,855	3,951,455
Held-to-maturity debt securities:
Held-to-maturity debt securities	709,594	725,722
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(71,010)	(70,890)
Estimated Fair Value	638,584	654,832
Equity securities at fair value	42,024	41,998
Trading debt securities	7,882	3,924
Other trading assets	4,673,355	4,723,099
Interest receivable	104,400	107,300
Available-for-sale
Available-for-sale debt securities:
Amortized Cost	3,980,545
Estimated Fair Value	3,913,855
Held-to-maturity debt securities:
Interest receivable	16,000	16,100
Held-to-maturity
Held-to-maturity debt securities:
Estimated Fair Value	638,584
Interest receivable	1,100	1,200
Residential mortgage-backed securities
Available-for-sale debt securities:
Amortized Cost	3,723,642	3,743,234
Gross Unrealized Gains	25,241	41,037
Gross Unrealized Losses	(93,382)	(91,625)
Estimated Fair Value	3,655,501	3,692,646
Held-to-maturity debt securities:
Held-to-maturity debt securities	709,594	725,722
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(71,010)	(70,890)
Estimated Fair Value	638,584	654,832
Commercial mortgage-backed securities
Available-for-sale debt securities:
Amortized Cost	245,890	244,457
Gross Unrealized Gains	2,114	3,555
Gross Unrealized Losses	(224)	0
Estimated Fair Value	247,780	248,012
Credit risk transfer securities
Available-for-sale debt securities:
Amortized Cost	11,013	11,248
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(439)	(451)
Estimated Fair Value	$ 10,574	$ 10,797

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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