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Investment Securities - Summary of Credit Quality Indicators of Held-to-maturity Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | $ 600,501 | $ 651,527
AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 600,501 | 651,527
U.S. Treasury Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 49,263 | 49,045
U.S. Treasury Securities [Member] | AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 49,263 | 49,045
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]. |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 309,216 | 339,815
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]. | AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 309,216 | 339,815
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 242,022 | 262,667
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | $ 242,022 | $ 262,667

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