Available for Sale Debt Securities - Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 3,266,829	$ 2,975,695
Gross unrealized gains	31,608	11,606
Gross unrealized losses	(133,681)	(218,386)
Fair value	3,164,756	2,768,915
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	274,500	348,621
Gross unrealized gains	190	317
Gross unrealized losses	(7,946)	(18,340)
Fair value	266,744	330,598
Government-agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	32,693	105,965
Gross unrealized gains	877	1,461
Gross unrealized losses	(31)	(191)
Fair value	33,539	107,235
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,705,346	2,243,725
Gross unrealized gains	23,454	4,982
Gross unrealized losses	(116,453)	(186,548)
Fair value	2,612,347	2,062,159
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	41,619	47,203
Gross unrealized gains	409	645
Gross unrealized losses	(267)	(285)
Fair value	41,761	47,563
State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	119,173	126,766
Gross unrealized gains	1,249	243
Gross unrealized losses	(7,423)	(10,092)
Fair value	112,999	116,917
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	93,498	103,415
Gross unrealized gains	5,429	3,958
Gross unrealized losses	(1,561)	(2,930)
Fair value	$ 97,366	$ 104,443

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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Amount, before tax, of unrealized loss 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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