Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Non-taxable:
Total	$ 50,638	$ 40,954	$ 148,163	$ 112,514
Held-to-maturity
Taxable:
Taxable	11,062	10,679	33,133	23,169
Non-taxable:
Non-taxable	10,137	10,181	30,488	26,371
Available-for-sale
Taxable:
Taxable	23,672	14,169	67,150	41,622
Non-taxable:
Non-taxable	$ 5,767	$ 5,925	$ 17,392	$ 21,352