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Investment Securities - Summary of Pledged Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Held-to-maturity [1] $ 693,637 $ 683,657
Asset Pledged as Collateral | Securing public and trust department deposits, and repurchase agreements:    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale 542,071 713,033
Held-to-maturity 553,726 559,142
Asset Pledged as Collateral | Securing additional borrowing capacity at the FHLB and the FRB:    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale 119,453 85,899
Held-to-maturity $ 63,768 $ 39,607
[1]     Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $236, respectively, at September 30, 2024, and $0 and $238, respectively, at December 31, 2023.