Investment Securities - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Available-for-sale debt securities:
Amortized Cost	$ 3,849,492	$ 3,572,482
Gross Unrealized Gains	6,277	540
Gross Unrealized Losses	(372,538)	(347,130)
Estimated Fair Value	3,483,231	3,225,892
Held-to-maturity debt securities:
Held-to-maturity debt securities	831,513	865,477
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(112,603)	(101,633)
Estimated Fair Value	718,910	763,844
Equity securities at fair value	74,232	51,825
Total investment securities	4,388,976	4,143,194
Interest receivable	121,900	118,100
Available-for-sale
Available-for-sale debt securities:
Amortized Cost	3,849,492
Estimated Fair Value	3,483,231
Held-to-maturity debt securities:
Interest receivable	12,000	9,500
Held-to-maturity
Held-to-maturity debt securities:
Estimated Fair Value	718,910
Interest receivable	1,300	1,400
U.S. Treasury securities
Available-for-sale debt securities:
Amortized Cost	403,641	651,112
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(15,483)	(14,639)
Estimated Fair Value	388,158	636,473
U.S. government agency securities
Available-for-sale debt securities:
Amortized Cost	125,000	125,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(18,791)	(18,408)
Estimated Fair Value	106,209	106,592
Residential mortgage-backed securities
Available-for-sale debt securities:
Amortized Cost	3,307,715	2,782,734
Gross Unrealized Gains	6,277	540
Gross Unrealized Losses	(337,456)	(312,442)
Estimated Fair Value	2,976,536	2,470,832
Held-to-maturity debt securities:
Held-to-maturity debt securities	831,513	865,477
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(112,603)	(101,633)
Estimated Fair Value	718,910	763,844
CRT securities
Available-for-sale debt securities:
Amortized Cost	13,136	13,636
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(808)	(1,641)
Estimated Fair Value	$ 12,328	$ 11,995

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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