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Investment Securities - Summary of Credit Quality Indicators of Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | $ 620,445 | $ 706,289
AAA |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 617,652 | 703,445
Not Rated |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 2,793 | 2,844
U.S. Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 71,862 | 71,388
U.S. Treasury Securities [Member] | AAA |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at 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] |  |
Investment securities available-for-sale (at fair value) | 196,848 | 226,131
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]. | AAA |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at 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] |  |
Investment securities available-for-sale (at fair value) | 348,942 | 405,926
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | AAA |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 348,942 | 405,926
Municipal Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 152 | 153
Municipal Securities [Member] | Not Rated |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 152 | 153
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 1,849 | 1,920
Corporate Debt Securities [Member] | Not Rated |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 1,849 | 1,920
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 792 | 771
Other Securities [Member] | Not Rated |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | $ 792 | $ 771

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