Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Sep. 01, 2022
Amortized Cost
Due in one year or less	$ 1,517
Due after one year through five years	13,778
Due after five years through ten years	95,218
Due after ten years	105,796
Total amortized cost	216,309
Mortgage-backed securities	268,967
Amortized Cost	485,276	$ 490,206
Fair Value
Due in one year or less	1,494
Due after one year through five years	12,766
Due after five years through ten years	82,084
Due after ten years	95,017
Total fair value	191,361
Mortgage-backed securities	243,344
Fair value	434,705	432,553
Amortized Cost
Due in one year or less	0
Due after one year through five years	84,463
Due after five years through ten years	74,282
Due after ten years	85,934
Total amortized cost	244,679
Mortgage-backed securities	219,267
Amortized Cost	463,946	465,858
Fair Value
Due in one year or less	0
Due after one year through five years	81,520
Due after five years through ten years	67,157
Due after ten years	76,773
Total fair value	225,450
Mortgage-backed securities	193,621
Fair value	$ 419,071	$ 411,264	$ 477,000