Loans and Allowance for Credit Losses - Schedule of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		$ 303,671	$ 107,341	$ 131,388
Charge-offs	$ (68,463)	(68,463)	(27,281)	(4,310)
Recoveries		12,553	11,182	9,075
Provision (Release) for Loan Losses		59,849	123,340	(28,812)
Balance at End of Period	307,610	307,610	303,671	107,341
Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	89,089	0
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		120,612	27,232	30,567
Charge-offs		(41,451)	(6,885)	(1,228)
Recoveries		4,172	4,610	791
Provision (Release) for Loan Losses		35,000	56,875	(2,898)
Balance at End of Period	118,333	118,333	120,612	27,232
Commercial | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	38,780	0
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		138,244	64,004	75,810
Charge-offs		(11,198)	(6,519)	(264)
Recoveries		2,417	1,095	4,403
Provision (Release) for Loan Losses		25,636	30,245	(15,945)
Balance at End of Period	155,099	155,099	138,244	64,004
Commercial real estate | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	49,419	0
BBCC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		2,431	2,458	6,120
Charge-offs		(1,650)	(85)	(144)
Recoveries		275	281	105
Provision (Release) for Loan Losses		1,831	(223)	(3,623)
Balance at End of Period	2,887	2,887	2,431	2,458
BBCC | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	0	0
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		21,916	9,347	12,608
Charge-offs	(256)	(256)	(344)	(346)
Recoveries		1,268	760	339
Provision (Release) for Loan Losses		(2,091)	12,017	(3,254)
Balance at End of Period	20,837	20,837	21,916	9,347
Residential real estate | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	136	0
Indirect
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		1,532	1,743	3,580
Charge-offs	(2,948)	(2,948)	(2,525)	(1,087)
Recoveries		1,559	1,263	1,682
Provision (Release) for Loan Losses		1,093	1,051	(2,432)
Balance at End of Period	1,236	1,236	1,532	1,743
Indirect | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	0	0
Direct
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		12,116	528	855
Charge-offs	(10,517)	(10,517)	(10,799)	(1,159)
Recoveries		2,331	2,557	777
Provision (Release) for Loan Losses		(761)	19,799	55
Balance at End of Period	3,169	3,169	12,116	528
Direct | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	31	0
Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		6,820	2,029	1,848
Charge-offs	(443)	(443)	(124)	(82)
Recoveries		531	616	978
Provision (Release) for Loan Losses		(859)	3,576	(715)
Balance at End of Period	$ 6,049	6,049	6,820	2,029
Home equity | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		$ 0	$ 723	$ 0