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Investment Securities - Gross Gains and Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 2,755,273	$ 2,791,843
Gross unrealized gains	6	8
Gross unrealized losses	(385,947)	(428,164)
Fair value	2,369,332	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	(657)	(654)
Fair value	9,343	9,346
Agency bond securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	240,315	240,272
Gross unrealized gains	0	0
Gross unrealized losses	(43,626)	(47,166)
Fair value	196,689	193,106
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,475,406	2,511,958
Gross unrealized gains	6	8
Gross unrealized losses	(335,973)	(373,704)
Fair value	2,139,439	2,138,262
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	29,552	29,613
Gross unrealized gains	0	0
Gross unrealized losses	(5,691)	(6,640)
Fair value	$ 23,861	$ 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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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- Definition

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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Paragraph 2
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- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Topic 326
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-Section 45
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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