Investment Securities - Summary of Pledged Securities (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Held-to-maturity	[1]	$ 679,506	$ 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		809,988	713,033
Held-to-maturity		568,473	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		98,146	85,899
Held-to-maturity		$ 50,046	$ 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 $238, respectively, at March 31, 2024, and $0 and $238, respectively, at December 31, 2023.