Securities - Narrative (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2024 USD ($) security	Dec. 31, 2023 USD ($) security	Mar. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities, carrying value	$ 144,400,000
Federal home loan bank	$ 1,200,000,000
Number of securities in unrealized loss positions | security	2,314	2,290
Unrealized loss positions	$ 2,100,000,000	$ 2,100,000,000
Percentage of portfolio	86.50%	85.10%
Allowance for credit losses for available for sale debt securities	$ 0	$ 0
Allowance for credit loss	158,000	157,000	$ 158,000	$ 0	$ 0	$ 0
Investment securities, held to maturity	1,904,439,000	1,945,795,000
Accrued interest receivable on available for sale debt securities	14,400,000	14,700,000
State and municipal
Schedule of Held-to-Maturity Securities [Line Items]
Allowance for credit loss	21,000	20,000
Investment securities, held to maturity	1,064,638,000	1,088,499,000
State and municipal | Internally-Assigned Rating Methodology
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities, held to maturity	$ 131,900,000	$ 143,700,000