Debt and Equity Securities - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Available-for-sale debt securities:
Amortized Cost	$ 4,343,134	$ 3,998,939
Gross Unrealized Gains	193	44,592
Gross Unrealized Losses	(247,472)	(92,076)
Estimated Fair Value	4,095,855	3,951,455
Held-to-maturity debt securities:
Held-to-maturity debt securities	672,881	725,722
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(97,497)	(70,890)
Estimated Fair Value	575,384	654,832
Equity securities at fair value	42,007	41,998
Trading debt securities	0	3,924
Other trading assets	4,810,743	4,723,099
Interest receivable	106,900	107,300
Available-for-sale
Available-for-sale debt securities:
Amortized Cost	4,343,134
Estimated Fair Value	4,095,855
Held-to-maturity debt securities:
Interest receivable	17,600	16,100
Held-to-maturity
Held-to-maturity debt securities:
Estimated Fair Value	575,384
Interest receivable	1,100	1,200
Residential mortgage-backed securities
Available-for-sale debt securities:
Amortized Cost	4,084,245	3,743,234
Gross Unrealized Gains	193	41,037
Gross Unrealized Losses	(234,221)	(91,625)
Estimated Fair Value	3,850,217	3,692,646
Held-to-maturity debt securities:
Held-to-maturity debt securities	672,881	725,722
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(97,497)	(70,890)
Estimated Fair Value	575,384	654,832
Commercial mortgage-backed securities
Available-for-sale debt securities:
Amortized Cost	248,437	244,457
Gross Unrealized Gains	0	3,555
Gross Unrealized Losses	(12,918)	0
Estimated Fair Value	235,519	248,012
Credit risk transfer securities
Available-for-sale debt securities:
Amortized Cost	10,452	11,248
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(333)	(451)
Estimated Fair Value	$ 10,119	$ 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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