Investment Securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	$ 167,776	$ 40,403
Gross Unrealized Loss , Less than 12 months	(2,110)	(169)
Fair Value, 12 months or more	603,903	1,228,463
Gross Unrealized Loss , 12 months or more	(106,062)	(187,477)
Fair Value, Total	771,679	1,268,866
Gross Unrealized Loss , Total	(108,172)	(187,646)
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	143,783	25,923
Gross Unrealized Loss , Less than 12 months	(338)	(21)
Fair Value, 12 months or more	816	14,040
Gross Unrealized Loss , 12 months or more	(5)	(1,156)
Fair Value, Total	144,599	39,963
Gross Unrealized Loss , Total	(343)	(1,177)
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	0	0
Gross Unrealized Loss , Less than 12 months	0	0
Fair Value, 12 months or more	470,625	896,971
Gross Unrealized Loss , 12 months or more	(90,176)	(160,418)
Fair Value, Total	470,625	896,971
Gross Unrealized Loss , Total	(90,176)	(160,418)
Mortgage-backed securities - commercial
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	0	0
Gross Unrealized Loss , Less than 12 months	0	0
Fair Value, 12 months or more	16,289	16,961
Gross Unrealized Loss , 12 months or more	(858)	(1,225)
Fair Value, Total	16,289	16,961
Gross Unrealized Loss , Total	(858)	(1,225)
Municipal securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	23,993	14,480
Gross Unrealized Loss , Less than 12 months	(1,772)	(148)
Fair Value, 12 months or more	115,191	188,669
Gross Unrealized Loss , 12 months or more	(15,007)	(21,271)
Fair Value, Total	139,184	203,149
Gross Unrealized Loss , Total	(16,779)	(21,419)
U.S. Treasury securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months		0
Gross Unrealized Loss , Less than 12 months		0
Fair Value, 12 months or more		108,496
Gross Unrealized Loss , 12 months or more		(3,233)
Fair Value, Total		108,496
Gross Unrealized Loss , Total		(3,233)
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	0	0
Gross Unrealized Loss , Less than 12 months	0	0
Fair Value, 12 months or more	982	3,326
Gross Unrealized Loss , 12 months or more	(16)	(174)
Fair Value, Total	982	3,326
Gross Unrealized Loss , Total	$ (16)	$ (174)

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