Debt and Equity Securities - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Available-for-sale debt securities:
Amortized Cost	$ 3,898,763	$ 3,998,939
Gross Unrealized Gains	25,132	44,592
Gross Unrealized Losses	(97,611)	(92,076)
Estimated Fair Value	3,826,284	3,951,455
Held-to-maturity debt securities:
Held-to-maturity debt securities	692,332	725,722
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(75,512)	(70,890)
Estimated Fair Value	616,820	654,832
Equity securities at fair value	43,429	41,998
Trading debt securities	2,539	3,924
Other trading assets	4,564,584	4,723,099
Interest receivable	110,700	107,300
Available-for-sale
Available-for-sale debt securities:
Amortized Cost	3,898,763
Estimated Fair Value	3,826,284
Held-to-maturity debt securities:
Interest receivable	15,600	16,100
Held-to-maturity
Held-to-maturity debt securities:
Estimated Fair Value	616,820
Interest receivable	1,100	1,200
Residential mortgage-backed securities
Available-for-sale debt securities:
Amortized Cost	3,640,879	3,743,234
Gross Unrealized Gains	23,945	41,037
Gross Unrealized Losses	(95,546)	(91,625)
Estimated Fair Value	3,569,278	3,692,646
Held-to-maturity debt securities:
Held-to-maturity debt securities	692,332	725,722
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(75,512)	(70,890)
Estimated Fair Value	616,820	654,832
Commercial mortgage-backed securities
Available-for-sale debt securities:
Amortized Cost	247,212	244,457
Gross Unrealized Gains	1,187	3,555
Gross Unrealized Losses	(1,674)	0
Estimated Fair Value	246,725	248,012
Credit risk transfer securities
Available-for-sale debt securities:
Amortized Cost	10,672	11,248
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(391)	(451)
Estimated Fair Value	$ 10,281	$ 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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