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Investment Securities - Summary of Available-for-Sale Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 748,478 | $ 819,762
Gross unrealized gains | 14 | 1
Gross unrealized losses | (128,047) | (113,474)
Fair Value | 620,445 | 706,289
U.S. Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 74,386 | 74,031
Gross unrealized losses | (2,524) | (2,643)
Fair Value | 71,862 | 71,388
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]. |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 240,292 | 263,939
Gross unrealized gains | 14 | 1
Gross unrealized losses | (43,458) | (37,809)
Fair Value | 196,848 | 226,131
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 430,853 | 478,866
Gross unrealized losses | (81,911) | (72,940)
Fair Value | 348,942 | 405,926
Municipal Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 155 | 155
Gross unrealized losses | (3) | (2)
Fair Value | 152 | 153
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 2,000 | 2,000
Gross unrealized losses | (151) | (80)
Fair Value | 1,849 | 1,920
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 792 | 771
Fair Value | $ 792 | $ 771

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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