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Investment Securities - Summary 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
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain   163
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (106,259) (91,766)
Fair value 494,242 559,924
U.S. Treasury Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities 49,263 49,045
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (1,848) (1,416)
Fair value 47,415 47,629
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
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain   163
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (49,023) (41,162)
Fair value 260,193 298,816
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
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (55,388) (49,188)
Fair value $ 186,634 $ 213,479