Loans, Allowance for Credit Losses, and Asset Quality Information - Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 110,058	$ 109,230	$ 109,853	$ 90,967	$ 90,967
Initial provision for credit losses on unfunded commitments acquired from GrandSouth	14,783	1,200	18,033	16,351
Charge-offs	(2,688)	(3,203)	(7,460)	(7,575)	(10,175)
Recoveries	565	971	2,292	2,845
Ending balance	122,718	108,198	122,718	108,198	109,853
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	9,860	13,019	11,369	13,306	13,306
Initial provision for credit losses on unfunded commitments acquired from GrandSouth	(583)	(1,200)	(2,092)	(3,408)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	9,277	11,819	9,277	11,819	$ 11,369
Unfunded Loan Commitment | GrandSouth
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Initial provision for credit losses on unfunded commitments acquired from GrandSouth	$ 0	$ 0	$ 0	$ 1,921