Investment Securities - Pledged Securities (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Held-to-maturity	[1]	$ 400,720	$ 374,129
Securing public and trust department deposits, and repurchase agreements: | Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Available-for-sale		1,002,333	795,496
Held-to-maturity		297,880	160,643
Securing collateral for cash flow hedge swaps: | Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Available-for-sale		0	18,208
Held-to-maturity		0	9,936
Securing additional borrowing capacity at the FHLB and the FRB: | Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Available-for-sale		4,818	6,504
Held-to-maturity		$ 1,828	$ 549

[1]     Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $286, respectively, at June 30, 2022 and $0 and $286, respectively, at December 31, 2021.