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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Securities Financing Transactions Disclosures [Abstract]    
Accrued interest, after allowance for credit loss $ 1,300  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable  
Held to maturity, at amortized cost $ 399,128 $ 399,494
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 $ 380,300 338,800
Letter of credit outstanding, amount $ 153,500 $ 189,000