Investment Securities - Contractual Maturities of Investment Securities - Held-to-maturity Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Held-to-maturity, Amortized Cost
Due after one year through five years	$ 20,163
Due after five years through ten years	24,465
Due after ten years	51,719
Total Held-to-maturity Securities	96,347
Held-to-maturity, Fair Value
Due after one year through five years	17,117
Due after five years through ten years	19,496
Due after ten years	39,120
Total Held-to-maturity Securities	$ 75,733
Weighted average remaining life	7 years	7 years 3 months 18 days