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Investment Securities - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
Investment securities total $ 1,200,000 $ 1,400,000  
Securities with no stated contractual date, amortized cost 800    
Securities with no stated contractual date, fair value 800    
Amortized cost 727,819 819,762  
Available-for-sale Securities 628,829 706,289  
Held-to-maturity securities 585,052 651,527  
Purchases of available-for-sale securities 0 259,846 $ 288,580
Maturities and paydowns of available-for-sale securities $ 92,032 141,892 235,860
Sales of available-for-sale securities   $ 128,430  
Number of securities | security 230 244  
Purchases of held-to-maturity securities $ 2,452 $ 101,699 397,758
Maturities and paydowns of held-to-maturity securities $ 69,555 $ 133,363 $ 161,923
Number of held-to-maturity securities in unrealized loss positions | security 123 129  
Held-to-maturity investment securities pledged as collateral $ 559,300 $ 355,300  
Held-to-maturity investment securities held as collateral 0 0  
Accrued interest receivable from available-for-sale investment securities $ 1,300 1,500  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Noncurrent, Statement of Financial Position [Extensible Enumeration] Financing Receivable, Allowance for Credit Losses    
Accrued interest receivable from held-to-maturity investment securities $ 1,000 1,100  
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Financing Receivable, Allowance for Credit Losses    
Asset Pledged as Collateral      
Available-for-sale Securities $ 0 0  
Asset Pledged as Collateral | Federal Funds Purchased [Member]      
Available-for-sale Securities $ 312,400 $ 484,900