Loans - Aging analysis of past due loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Loans and Allowance for Loan Losses
Non-Accruing	$ 163,320	$ 104,225
Total loans	32,016,672	30,177,862
30 days past due
Loans and Allowance for Loan Losses
Total loans	61,071	68,416
60 days past due
Loans and Allowance for Loan Losses
Total loans	28,966	31,607
90 days past due
Loans and Allowance for Loan Losses
Total loans	2,604	4,350
Total Past Due
Loans and Allowance for Loan Losses
Total loans	92,641	104,373
Current
Loans and Allowance for Loan Losses
Total loans	31,760,711	29,969,264
Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	25,780,875	22,805,039
Construction and land development
Loans and Allowance for Loan Losses
Non-Accruing	683	827
Total loans	2,776,241	2,860,360
Construction and land development | 30 days past due
Loans and Allowance for Loan Losses
Total loans	1,272	2,146
Construction and land development | 60 days past due
Loans and Allowance for Loan Losses
Total loans	474	3,653
Construction and land development | 90 days past due
Loans and Allowance for Loan Losses
Total loans	46
Construction and land development | Total Past Due
Loans and Allowance for Loan Losses
Total loans	1,792	5,799
Construction and land development | Current
Loans and Allowance for Loan Losses
Total loans	2,773,766	2,853,734
Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Non-Accruing	22,565	17,307
Total loans	6,259,048	5,162,042
Consumer Owner Occupied Loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	5,145	6,001
Consumer Owner Occupied Loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	1,595	744
Consumer Owner Occupied Loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	26	40
Consumer Owner Occupied Loans | Total Past Due
Loans and Allowance for Loan Losses
Total loans	6,766	6,785
Consumer Owner Occupied Loans | Current
Loans and Allowance for Loan Losses
Total loans	6,229,717	5,137,950
Home equity loans
Loans and Allowance for Loan Losses
Non-Accruing	4,352	6,316
Total loans	1,349,097	1,313,168
Home equity loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	3,221	2,527
Home equity loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	949	361
Home equity loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	1
Home equity loans | Total Past Due
Loans and Allowance for Loan Losses
Total loans	4,171	2,888
Home equity loans | Current
Loans and Allowance for Loan Losses
Total loans	1,340,574	1,303,964
Commercial and industrial
Loans and Allowance for Loan Losses
Non-Accruing	69,149	17,129
Total loans	5,458,229	5,313,483
Commercial and industrial | 30 days past due
Loans and Allowance for Loan Losses
Total loans	27,715	24,500
Commercial and industrial | 60 days past due
Loans and Allowance for Loan Losses
Total loans	14,819	11,677
Commercial and industrial | 90 days past due
Loans and Allowance for Loan Losses
Total loans	806	1,704
Commercial and industrial | Total Past Due
Loans and Allowance for Loan Losses
Total loans	43,340	37,881
Commercial and industrial | Current
Loans and Allowance for Loan Losses
Total loans	5,345,740	5,258,473
Other income producing property
Loans and Allowance for Loan Losses
Non-Accruing	3,683	2,734
Total loans	670,331	696,242
Other income producing property | 30 days past due
Loans and Allowance for Loan Losses
Total loans	301	1,623
Other income producing property | 60 days past due
Loans and Allowance for Loan Losses
Total loans	288	1,480
Other income producing property | 90 days past due
Loans and Allowance for Loan Losses
Total loans		298
Other income producing property | Total Past Due
Loans and Allowance for Loan Losses
Total loans	589	3,401
Other income producing property | Current
Loans and Allowance for Loan Losses
Total loans	666,059	690,107
Consumer loans
Loans and Allowance for Loan Losses
Non-Accruing	4,741	4,398
Total loans	1,258,078	1,278,426
Consumer loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	14,522	19,713
Consumer loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	7,965	10,655
Consumer loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	24
Consumer loans | Total Past Due
Loans and Allowance for Loan Losses
Total loans	22,511	30,368
Consumer loans | Current
Loans and Allowance for Loan Losses
Total loans	1,230,826	1,243,660
Other loans
Loans and Allowance for Loan Losses
Total loans	4,199	20,989
Other loans | Current
Loans and Allowance for Loan Losses
Total loans	4,199	20,989
Commercial loans
Loans and Allowance for Loan Losses
Total loans	22,222,778	21,430,337
Commercial loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	1,913,161	1,956,300
Commercial loans | Commercial non-owner occupied
Loans and Allowance for Loan Losses
Non-Accruing	23,287	20,425
Total loans	8,702,352	8,072,959
Commercial loans | Commercial non-owner occupied | 30 days past due
Loans and Allowance for Loan Losses
Total loans	4,922	1,158
Commercial loans | Commercial non-owner occupied | 60 days past due
Loans and Allowance for Loan Losses
Total loans	1,378	978
Commercial loans | Commercial non-owner occupied | 90 days past due
Loans and Allowance for Loan Losses
Total loans		77
Commercial loans | Commercial non-owner occupied | Total Past Due
Loans and Allowance for Loan Losses
Total loans	6,300	2,213
Commercial loans | Commercial non-owner occupied | Current
Loans and Allowance for Loan Losses
Total loans	8,672,765	8,050,321
Commercial loans | Commercial owner occupied real estate loan
Loans and Allowance for Loan Losses
Non-Accruing	34,860	35,089
Total loans	5,539,097	5,460,193
Commercial loans | Commercial owner occupied real estate loan | 30 days past due
Loans and Allowance for Loan Losses
Total loans	3,973	10,748
Commercial loans | Commercial owner occupied real estate loan | 60 days past due
Loans and Allowance for Loan Losses
Total loans	1,498	2,059
Commercial loans | Commercial owner occupied real estate loan | 90 days past due
Loans and Allowance for Loan Losses
Total loans	1,701	2,231
Commercial loans | Commercial owner occupied real estate loan | Total Past Due
Loans and Allowance for Loan Losses
Total loans	7,172	15,038
Commercial loans | Commercial owner occupied real estate loan | Current
Loans and Allowance for Loan Losses
Total loans	5,497,065	5,410,066
Commercial loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Total loans	50,186	30,741
Commercial loans | Commercial and industrial
Loans and Allowance for Loan Losses
Total loans	5,458,229	5,313,483
Commercial loans | Other income producing property
Loans and Allowance for Loan Losses
Total loans	555,554	575,672
Commercial loans | Other loans
Loans and Allowance for Loan Losses
Total loans	4,199	20,989
Consumer portfolio loans
Loans and Allowance for Loan Losses
Total loans	9,793,894	8,747,525
Consumer portfolio loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	25,418	30,013
Consumer portfolio loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	13,526	14,615
Consumer portfolio loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	11,980	10,472
Consumer portfolio loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	863,080	904,060
Consumer portfolio loans | Construction and land development | 30 days past due
Loans and Allowance for Loan Losses
Total loans	59	125
Consumer portfolio loans | Construction and land development | 60 days past due
Loans and Allowance for Loan Losses
Total loans	11
Consumer portfolio loans | Construction and land development | 90 days past due
Loans and Allowance for Loan Losses
Total loans	231	477
Consumer portfolio loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Total loans	6,208,862	5,131,301
Consumer portfolio loans | Consumer Owner Occupied Loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	6,386	7,215
Consumer portfolio loans | Consumer Owner Occupied Loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	3,721	3,063
Consumer portfolio loans | Consumer Owner Occupied Loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	7,353	5,874
Consumer portfolio loans | Home equity loans
Loans and Allowance for Loan Losses
Total loans	1,349,097	1,313,168
Consumer portfolio loans | Home equity loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	3,989	2,658
Consumer portfolio loans | Home equity loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	1,338	691
Consumer portfolio loans | Home equity loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	971	1,081
Consumer portfolio loans | Other income producing property
Loans and Allowance for Loan Losses
Total loans	114,777	120,570
Consumer portfolio loans | Other income producing property | 30 days past due
Loans and Allowance for Loan Losses
Total loans	313	62
Consumer portfolio loans | Other income producing property | 60 days past due
Loans and Allowance for Loan Losses
Total loans	188	23
Consumer portfolio loans | Other income producing property | 90 days past due
Loans and Allowance for Loan Losses
Total loans	121	121
Consumer portfolio loans | Consumer loans
Loans and Allowance for Loan Losses
Total loans	1,258,078	1,278,426
Consumer portfolio loans | Consumer loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	14,671	19,953
Consumer portfolio loans | Consumer loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	8,268	10,838
Consumer portfolio loans | Consumer loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	$ 3,304	$ 2,919