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Investment Securities - Narrative (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]      
Investment securities total $ 1,300,000   $ 1,000,000
Held-to-maturity securities 689,486   533,108
Available-for-sale Securities 612,719   $ 527,547
Purchases of available-for-sale securities 164,656 $ 199,079  
Maturities and paydowns of available-for-sale securities 100,403 137,632  
Sales of available-for-sale securities $ 0 0  
Number of securities | security 168   180
Purchases of held-to-maturity securities $ 260,257 0  
Maturities and paydowns of held-to-maturity securities $ 104,985 $ 47,385  
Number of held-to-maturity securities in unrealized loss positions | security 112   160
Held-to-maturity investment securities pledged as collateral $ 531,600   $ 500,500
Held-to-maturity investment securities held as collateral 0   0
Accrued interest receivable from available-for-sale investment securities 1,500   1,300
Accrued interest receivable from held-to-maturity investment securities 1,700   900
Other securities investments with no contractual maturity      
Schedule of Available-for-sale Securities [Line Items]      
Securities with no stated contractual date, amortized cost 700    
Securities with no stated contractual date, fair value 700    
Asset Pledged as Collateral      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities 0   0
Asset Pledged as Collateral | Federal Funds Purchased      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities $ 140,800   $ 238,600
Financing Receivable, Pledging Purpose [Extensible Enumeration] Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities