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Investment Securities - Gross Gains and Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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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

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- 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 + Details
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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 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 (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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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 + Details
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