Investment Securities - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Available-for-sale debt securities:
Amortized Cost	$ 3,870,870	$ 3,694,578
Gross Unrealized Gains	30,998	7,200
Gross Unrealized Losses	(100,607)	(177,092)
Estimated Fair Value	3,801,261	3,524,686
Held-to-maturity debt securities:
Held-to-maturity debt securities	743,120	796,168
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(81,197)	(117,994)
Estimated Fair Value	661,923	678,174
Equity securities at fair value	55,054	75,261
Trading securities	2,219	0
Total investment securities	4,601,654	4,396,115
Interest receivable	107,600	107,300
Available-for-sale
Available-for-sale debt securities:
Amortized Cost	3,870,870
Estimated Fair Value	3,801,261
Held-to-maturity debt securities:
Interest receivable	15,600	13,800
Held-to-maturity
Held-to-maturity debt securities:
Estimated Fair Value	661,923
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	3,616,063	3,195,145
Gross Unrealized Gains	28,099	7,200
Gross Unrealized Losses	(100,147)	(168,302)
Estimated Fair Value	3,544,015	3,034,043
Held-to-maturity debt securities:
Held-to-maturity debt securities	743,120	796,168
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(81,197)	(117,994)
Estimated Fair Value	661,923	678,174
Commercial mortgage-backed securities
Available-for-sale debt securities:
Amortized Cost	243,360	206,830
Gross Unrealized Gains	2,899	0
Gross Unrealized Losses	(6)	(5,398)
Estimated Fair Value	246,253	201,432
Credit risk transfer securities
Available-for-sale debt securities:
Amortized Cost	11,447	12,466
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(454)	(540)
Estimated Fair Value	$ 10,993	$ 11,926

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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