Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 337,459	$ 272,483	$ 300,665	$ 263,233
Charged-off loans	(24,709)	(17,699)	(57,616)	(33,384)
Recovery of previously charged-off loans	6,616	6,716	22,461	18,566
Provision for Loan and Lease Losses	26,826	26,588	80,682	39,673
Ending Balance	346,192	288,088	346,192	288,088
Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	26,497	19,609	26,617	19,618
Charged-off loans	0	(447)	0	(1,412)
Recovery of previously charged-off loans	52	1,039	66	1,373
Provision for Loan and Lease Losses	1,329	(132)	1,195	490
Ending Balance	27,878	20,069	27,878	20,069
Commercial real estate - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	55,108	52,547	40,479	58,504
Charged-off loans	0	(99)	0	(284)
Recovery of previously charged-off loans	44	0	1,233	247
Provision for Loan and Lease Losses	2,097	(1,884)	15,537	(7,903)
Ending Balance	57,249	50,564	57,249	50,564
Consumer real estate – mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	59,374	33,883	36,536	32,104
Charged-off loans	(168)	(155)	(598)	(409)
Recovery of previously charged-off loans	374	426	1,989	1,298
Provision for Loan and Lease Losses	10,917	1,311	32,570	2,472
Ending Balance	70,497	35,465	70,497	35,465
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	38,855	28,681	36,114	29,429
Charged-off loans	(3)	0	(3)	(150)
Recovery of previously charged-off loans	86	15	337	164
Provision for Loan and Lease Losses	(1,908)	(75)	582	(822)
Ending Balance	37,030	28,621	37,030	28,621
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	148,418	125,772	144,353	112,340
Charged-off loans	(20,330)	(13,029)	(45,158)	(22,684)
Recovery of previously charged-off loans	3,831	2,869	11,959	10,393
Provision for Loan and Lease Losses	12,383	24,673	33,148	40,236
Ending Balance	144,302	140,285	144,302	140,285
Consumer and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	9,207	11,991	16,566	11,238
Charged-off loans	(4,208)	(3,969)	(11,857)	(8,445)
Recovery of previously charged-off loans	2,229	2,367	6,877	5,091
Provision for Loan and Lease Losses	2,008	2,695	(2,350)	5,200
Ending Balance	$ 9,236	$ 13,084	$ 9,236	$ 13,084