Investment Securities - Narrative (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) security	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, accrued interest receivable	$ 2,100,000		$ 2,400,000
Held-to-maturity securities, accrued interest receivable	$ 2,000,000		$ 1,900,000
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other assets		Other assets
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other assets		Other assets
Proceeds from sales of investment securities, available-for-sale	$ 8,555,000	$ 0
Gross realized losses on securities	$ 555,000
Number of available for sale securities that have unrealized losses | security	261
Number of held to maturity securities that have unrealized losses | security	150
Allowance for credit loss	$ 18,657,000	$ 16,599,000	$ 18,371,000	$ 16,128,000
Investment Securities
Debt Securities, Available-for-sale [Line Items]
Allowance for credit loss	0
Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Investment securities pledged as collateral	$ 341,800,000		$ 429,900,000