Investment Securities, Contractual Maturity (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Amortized Cost [Abstract]
One year or less	$ 335
After one year through five years	19,386
After five years through ten years	6,114
After ten years	114,863
Total	140,698
Fair Value [Abstract]
One year or less	335
After one year through five years	18,756
After five years through ten years	5,913
After ten years	93,433
Total	118,437
Amortized Cost [Abstract]
One year or less	283
After one year through five years	11,174
After five years through ten years	30,348
After ten years	808,582
Fair value, excluding securities without single maturity date	850,387
Fair Value [Abstract]
One year or less	283
After one year through five years	11,155
After five years through ten years	28,835
After ten years	665,636
Fair value, excluding investment securities without single maturity date	$ 705,909