Investment Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Securities Financing Transactions Disclosures [Abstract]
AFS accrued interest	$ 982
Held-to-maturity securities	396,998		$ 399,128
HTM accrued interest	2,200
Available-for-sale securities pledged as collateral	383,900		380,300
Letter of credit outstanding, amount	142,900		$ 153,500
Net gains	$ 0	$ 0
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable