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Investment Securities - Gross Gains and Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 2,400,781	$ 2,617,266
Gross unrealized gains	3	0
Gross unrealized losses	(367,982)	(380,265)
Fair value	2,032,802	2,237,001
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	10,000	10,000
Gross unrealized gains	0	0
Gross unrealized losses	(110)	(374)
Fair value	9,890	9,626
Agency bond securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	240,628	240,447
Gross unrealized gains	0	0
Gross unrealized losses	(38,132)	(40,217)
Fair value	202,496	200,230
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,121,037	2,337,411
Gross unrealized gains	3	0
Gross unrealized losses	(323,467)	(333,901)
Fair value	1,797,573	2,003,510
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	29,116	29,408
Gross unrealized gains	0	0
Gross unrealized losses	(6,273)	(5,773)
Fair value	$ 22,843	$ 23,635

X

- Definition

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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