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Investment Securities - Gross Gains and Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 2,710,693	$ 2,791,843
Gross unrealized gains	4	8
Gross unrealized losses	(426,284)	(428,164)
Fair value	2,284,413	2,363,687
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	10,000	10,000
Gross unrealized gains	0	0
Gross unrealized losses	(642)	(654)
Fair value	9,358	9,346
Agency bond securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	240,358	240,272
Gross unrealized gains	0	0
Gross unrealized losses	(45,237)	(47,166)
Fair value	195,121	193,106
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,430,788	2,511,958
Gross unrealized gains	4	8
Gross unrealized losses	(374,346)	(373,704)
Fair value	2,056,446	2,138,262
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	29,547	29,613
Gross unrealized gains	0	0
Gross unrealized losses	(6,059)	(6,640)
Fair value	$ 23,488	$ 22,973

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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