Investment Securities - Pledged Securities (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Held-to-maturity	[1]	$ 407,801	$ 374,129
Asset Pledged as Collateral | Securing public and trust department deposits, and repurchase agreements:
Debt Securities, Available-for-sale [Line Items]
Available-for-sale		891,050	795,496
Held-to-maturity		285,207	160,643
Asset Pledged as Collateral | Securing collateral for cash flow hedge swaps:
Debt Securities, Available-for-sale [Line Items]
Available-for-sale		0	18,208
Held-to-maturity		0	9,936
Asset Pledged as Collateral | Securing additional borrowing capacity at the FHLB and the FRB:
Debt Securities, Available-for-sale [Line Items]
Available-for-sale		4,223	6,504
Held-to-maturity		$ 1,284	$ 549

[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 September 30, 2022 and $0 and $286, respectively, at December 31, 2021.