Investment Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Securities Financing Transactions Disclosures [Abstract]
Available-for-sale securities	$ 484,130	$ 416,314
Accrued interest, after allowance for credit loss	$ 3,100
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable
Held-to-maturity securities	$ 340,957	347,285
Held-to-maturity, accrued Interest, after allowance for credit loss	$ 1,900
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable
Available-for-sale securities pledged as collateral	$ 541,800	544,700
Letter of credit outstanding, amount	406,500	162,500
Gross realized gains on the sale of AFS securities	$ 0	$ 0