Investment Securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	$ 213,001	$ 40,403
Unrealized Loss, Less than 12 months	(525)	(169)
Fair Value, 12 months or more	990,287	1,228,463
Unrealized Loss, 12 months or more	(183,263)	(187,477)
Fair Value, Total	1,203,288	1,268,866
Unrealized Loss, Total	(183,788)	(187,646)
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	203,870	25,923
Unrealized Loss, Less than 12 months	(484)	(21)
Fair Value, 12 months or more	7,251	14,040
Unrealized Loss, 12 months or more	(687)	(1,156)
Fair Value, Total	211,121	39,963
Unrealized Loss, Total	(1,171)	(1,177)
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	0	0
Unrealized Loss, Less than 12 months	0	0
Fair Value, 12 months or more	776,208	896,971
Unrealized Loss, 12 months or more	(158,259)	(160,418)
Fair Value, Total	776,208	896,971
Unrealized Loss, Total	(158,259)	(160,418)
Mortgage-backed securities - commercial
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	0	0
Unrealized Loss, Less than 12 months	0	0
Fair Value, 12 months or more	16,615	16,961
Unrealized Loss, 12 months or more	(1,284)	(1,225)
Fair Value, Total	16,615	16,961
Unrealized Loss, Total	(1,284)	(1,225)
Municipal securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	9,131	14,480
Unrealized Loss, Less than 12 months	(41)	(148)
Fair Value, 12 months or more	155,959	188,669
Unrealized Loss, 12 months or more	(22,802)	(21,271)
Fair Value, Total	165,090	203,149
Unrealized Loss, Total	(22,843)	(21,419)
U.S. Treasury securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	0	0
Unrealized Loss, Less than 12 months	0	0
Fair Value, 12 months or more	30,857	108,496
Unrealized Loss, 12 months or more	(128)	(3,233)
Fair Value, Total	30,857	108,496
Unrealized Loss, Total	(128)	(3,233)
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	0	0
Unrealized Loss, Less than 12 months	0	0
Fair Value, 12 months or more	3,397	3,326
Unrealized Loss, 12 months or more	(103)	(174)
Fair Value, Total	3,397	3,326
Unrealized Loss, Total	$ (103)	$ (174)