Securities, AFS Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 360
From one to five years	406,527
From five to ten years	566,555
After ten years	734,498
Amortized cost	1,707,940	$ 1,743,882
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	357
From one to five years	370,571
From five to ten years	495,942
After ten years	645,138
Fair value	$ 1,512,008	$ 1,527,225