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Investment Securities - Narrative (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
USD ($)
security
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
security
Investment securities total $ 1,200,000   $ 1,200,000
Securities with no stated contractual date, fair value 51,232    
Amortized cost 789,933   727,819
Available-for-sale Securities 708,987   628,829
Held-to-maturity securities 538,157   $ 585,052
Purchases of available-for-sale securities 199,079 $ 0  
Maturities and paydowns of available-for-sale securities 137,632 71,339  
Sales of available-for-sale securities $ 0 0  
Number of securities | security 216   230
Purchases of held-to-maturity securities $ 0 2,452  
Maturities and paydowns of held-to-maturity securities $ 47,385 $ 53,947  
Number of held-to-maturity securities in unrealized loss positions | security 109   123
Held-to-maturity investment securities pledged as collateral $ 535,500   $ 559,300
Held-to-maturity investment securities held as collateral 0   0
Accrued interest receivable from available-for-sale investment securities 1,800   1,300
Accrued interest receivable from held-to-maturity investment securities 1,200   1,000
Other securities investments with no contractual maturity      
Securities with no stated contractual date, amortized cost 700    
Securities with no stated contractual date, fair value 700    
Asset Pledged as Collateral      
Available-for-sale Securities 0   0
Asset Pledged as Collateral | Federal Funds Purchased      
Available-for-sale Securities $ 236,700   $ 312,400
Financing Receivable, Pledging Purpose [Extensible Enumeration] Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities