Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 01, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 1,319
Due after one year through five years	14,126
Due after five years through ten years	89,731
Due after ten years	113,831
Total excluding mortgage-backed securities	219,007
Mortgage-backed securities	271,199
Amortized Cost	490,206		$ 946,511
Fair Value
Due in one year or less	1,304
Due after one year through five years	12,871
Due after five years through ten years	76,895
Due after ten years	99,466
Total excluding mortgage-backed securities	190,536
Mortgage-backed securities	242,017
Fair Value	432,553		$ 938,164
Amortized Cost
Due in one year or less	0
Due after one year through five years	79,306
Due after five years through ten years	78,975
Due after ten years	85,881
Total amortized cost	244,162
Mortgage-backed securities	221,696
Amortized Cost	465,858
Fair Value
Due in one year or less	0
Due after one year through five years	75,759
Due after five years through ten years	69,275
Due after ten years	73,655
Total fair value	218,689
Mortgage-backed securities	192,575
Fair Value	$ 411,264	$ 477,000