v3.25.4

Investment Securities - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2025	Sep. 30, 2024	Dec. 31, 2025	Dec. 31, 2024
Available-for-sale debt securities:
Amortized Cost			$ 3,998,939	$ 3,694,578
Gross Unrealized Gains			44,592	7,200
Gross Unrealized Losses			(92,076)	(177,092)
Estimated Fair Value			3,951,455	3,524,686
Held-to-maturity debt securities:
Held-to-maturity debt securities			725,722	796,168
Gross Unrealized Gains			0	0
Gross Unrealized Losses			(70,890)	(117,994)
Estimated Fair Value			654,832	678,174
Equity securities at fair value			41,998	75,261
Trading securities			3,924	0
Total investment securities			4,723,099	4,396,115
Interest receivable			107,300	107,300
Available-for-sale
Available-for-sale debt securities:
Amortized Cost			3,998,939
Estimated Fair Value			3,951,455
Held-to-maturity debt securities:
Interest receivable			16,100	13,800
Debt Securities, Realized Gain (Loss)	$ 1,900	$ 179,600
Held-to-maturity
Held-to-maturity debt securities:
Estimated Fair Value			654,832
Interest receivable			1,200	1,300
U.S. Treasury securities
Available-for-sale debt securities:
Amortized Cost				280,137
Gross Unrealized Gains				0
Gross Unrealized Losses				(2,852)
Estimated Fair Value				277,285
Residential mortgage-backed securities
Available-for-sale debt securities:
Amortized Cost			3,743,234	3,195,145
Gross Unrealized Gains			41,037	7,200
Gross Unrealized Losses			(91,625)	(168,302)
Estimated Fair Value			3,692,646	3,034,043
Held-to-maturity debt securities:
Held-to-maturity debt securities			725,722	796,168
Gross Unrealized Gains			0	0
Gross Unrealized Losses			(70,890)	(117,994)
Estimated Fair Value			654,832	678,174
Commercial mortgage-backed securities
Available-for-sale debt securities:
Amortized Cost			244,457	206,830
Gross Unrealized Gains			3,555	0
Gross Unrealized Losses			0	(5,398)
Estimated Fair Value			248,012	201,432
CRT securities
Available-for-sale debt securities:
Amortized Cost			11,248	12,466
Gross Unrealized Gains			0	0
Gross Unrealized Losses			(451)	(540)
Estimated Fair Value			$ 10,797	$ 11,926

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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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