Investment Securities - Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 3,417,228	$ 3,266,829
Gross unrealized gains	14,969	31,608
Gross unrealized losses	(145,741)	(133,681)
Fair value	3,286,456	3,164,756
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	200,584	274,500
Gross unrealized gains	52	190
Gross unrealized losses	(6,401)	(7,946)
Fair value	194,235	266,744
Government-agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	28,324	32,693
Gross unrealized gains	581	877
Gross unrealized losses	(211)	(31)
Fair value	28,694	33,539
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,927,054	2,705,346
Gross unrealized gains	8,155	23,454
Gross unrealized losses	(130,178)	(116,453)
Fair value	2,805,031	2,612,347
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	35,165	41,619
Gross unrealized gains	454	409
Gross unrealized losses	(211)	(267)
Fair value	35,408	41,761
State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	118,970	119,173
Gross unrealized gains	784	1,249
Gross unrealized losses	(7,370)	(7,423)
Fair value	112,384	112,999
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	107,131	93,498
Gross unrealized gains	4,943	5,429
Gross unrealized losses	(1,370)	(1,561)
Fair value	$ 110,704	$ 97,366

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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