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Investment Securities - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Securities Financing Transactions Disclosures [Abstract]
AFS accrued interest	$ 1,100
Held-to-maturity securities	386,618		$ 399,128
HTM accrued interest	$ 2,200
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	$ 490,100		380,300
Letter of credit outstanding, amount	154,000		$ 153,500
Net gains	$ 0	$ 0

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Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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