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Investment Securities - Summary of Pledged Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Held-to-maturity [1] $ 931,824 $ 774,800
Asset Pledged as Collateral | Securing public and trust department deposits, and repurchase agreements:    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale 406,307 505,963
Held-to-maturity 718,780 563,014
Asset Pledged as Collateral | Securing additional borrowing capacity at the FHLB and the FRB:    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale 4,099 3,119
Held-to-maturity $ 90,298 $ 1,215
[1]     Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $237, respectively, at both September 30, 2025 and December 31, 2024.