Investment Securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	$ 223,056	$ 40,403
Gross Unrealized Loss , Less than 12 months	(2,429)	(169)
Fair Value, 12 months or more	913,755	1,228,463
Gross Unrealized Loss , 12 months or more	(181,213)	(187,477)
Fair Value, Total	1,136,811	1,268,866
Gross Unrealized Loss , Total	(183,642)	(187,646)
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	191,125	25,923
Gross Unrealized Loss , Less than 12 months	(232)	(21)
Fair Value, 12 months or more	7,218	14,040
Gross Unrealized Loss , 12 months or more	(636)	(1,156)
Fair Value, Total	198,343	39,963
Gross Unrealized Loss , Total	(868)	(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	754,282	896,971
Gross Unrealized Loss , 12 months or more	(157,292)	(160,418)
Fair Value, Total	754,282	896,971
Gross Unrealized Loss , Total	(157,292)	(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	16,103	16,961
Gross Unrealized Loss , 12 months or more	(1,295)	(1,225)
Fair Value, Total	16,103	16,961
Gross Unrealized Loss , Total	(1,295)	(1,225)
Municipal securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	31,931	14,480
Gross Unrealized Loss , Less than 12 months	(2,197)	(148)
Fair Value, 12 months or more	132,733	188,669
Gross Unrealized Loss , 12 months or more	(21,909)	(21,271)
Fair Value, Total	164,664	203,149
Gross Unrealized Loss , Total	(24,106)	(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	3,419	3,326
Gross Unrealized Loss , 12 months or more	(81)	(174)
Fair Value, Total	3,419	3,326
Gross Unrealized Loss , Total	$ (81)	$ (174)

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