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Investment Securities - Narrative (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
security
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 748,478   819,762
Available-for-sale Securities 620,445   706,289
Held-to-maturity securities 600,501   $ 651,527
Purchases of available-for-sale securities 0 $ 260,249  
Maturities and paydowns of available-for-sale securities 71,339 116,002  
Sales of available-for-sale securities $ 0 0  
Number of securities | security 237   244
Purchases of held-to-maturity securities $ 2,452 91,607  
Maturities and paydowns of held-to-maturity securities $ 53,947 $ 93,201  
Number of held-to-maturity securities in unrealized loss positions | security 160   129
Held-to-maturity investment securities pledged as collateral $ 600,500   $ 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
Accrued interest receivable from held-to-maturity investment securities 1,300   1,100
Asset Pledged as Collateral      
Available-for-sale Securities 0   0
Asset Pledged as Collateral | Federal Funds Purchased [Member]      
Available-for-sale Securities $ 205,300   $ 484,900
Financing Receivable, Pledging Purpose [Extensible Enumeration] Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities