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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