Loans - Aging analysis of past due loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loans and Allowance for Loan Losses
Non-Accruing	$ 120,970	$ 104,225
Total loans	30,696,142	30,177,862
30 days past due
Loans and Allowance for Loan Losses
Total loans	51,733	68,416
60 days past due
Loans and Allowance for Loan Losses
Total loans	30,173	31,607
90 days past due
Loans and Allowance for Loan Losses
Total loans	3,650	4,350
Total Past Due
Loans and Allowance for Loan Losses
Total loans	85,556	104,373
Current
Loans and Allowance for Loan Losses
Total loans	30,489,616	29,969,264
Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	23,750,452	22,805,039
Construction and land development
Loans and Allowance for Loan Losses
Non-Accruing	306	827
Total loans	2,749,290	2,860,360
Construction and land development | 30 days past due
Loans and Allowance for Loan Losses
Total loans	980	2,146
Construction and land development | 60 days past due
Loans and Allowance for Loan Losses
Total loans	4,050	3,653
Construction and land development | Total Past Due
Loans and Allowance for Loan Losses
Total loans	5,030	5,799
Construction and land development | Current
Loans and Allowance for Loan Losses
Total loans	2,743,954	2,853,734
Commercial non-owner occupied
Loans and Allowance for Loan Losses
Non-Accruing	21,758	20,425
Total loans	8,236,216	8,072,959
Commercial non-owner occupied | 30 days past due
Loans and Allowance for Loan Losses
Total loans	4,410	1,158
Commercial non-owner occupied | 60 days past due
Loans and Allowance for Loan Losses
Total loans	1,778	978
Commercial non-owner occupied | 90 days past due
Loans and Allowance for Loan Losses
Total loans		77
Commercial non-owner occupied | Total Past Due
Loans and Allowance for Loan Losses
Total loans	6,188	2,213
Commercial non-owner occupied | Current
Loans and Allowance for Loan Losses
Total loans	8,208,270	8,050,321
Commercial owner occupied real estate loan
Loans and Allowance for Loan Losses
Non-Accruing	35,563	35,089
Total loans	5,522,514	5,460,193
Commercial owner occupied real estate loan | 30 days past due
Loans and Allowance for Loan Losses
Total loans	3,841	10,748
Commercial owner occupied real estate loan | 60 days past due
Loans and Allowance for Loan Losses
Total loans	4,552	2,059
Commercial owner occupied real estate loan | 90 days past due
Loans and Allowance for Loan Losses
Total loans	1,665	2,231
Commercial owner occupied real estate loan | Total Past Due
Loans and Allowance for Loan Losses
Total loans	10,058	15,038
Commercial owner occupied real estate loan | Current
Loans and Allowance for Loan Losses
Total loans	5,476,893	5,410,066
Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Non-Accruing	19,381	17,307
Total loans	5,528,546	5,162,042
Consumer Owner Occupied Loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	2,521	6,001
Consumer Owner Occupied Loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	1,344	744
Consumer Owner Occupied Loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans		40
Consumer Owner Occupied Loans | Total Past Due
Loans and Allowance for Loan Losses
Total loans	3,865	6,785
Consumer Owner Occupied Loans | Current
Loans and Allowance for Loan Losses
Total loans	5,505,300	5,137,950
Home equity loans
Loans and Allowance for Loan Losses
Non-Accruing	5,736	6,316
Total loans	1,332,285	1,313,168
Home equity loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	2,811	2,527
Home equity loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	673	361
Home equity loans | Total Past Due
Loans and Allowance for Loan Losses
Total loans	3,484	2,888
Home equity loans | Current
Loans and Allowance for Loan Losses
Total loans	1,323,065	1,303,964
Commercial and industrial
Loans and Allowance for Loan Losses
Non-Accruing	29,953	17,129
Total loans	5,321,306	5,313,483
Commercial and industrial | 30 days past due
Loans and Allowance for Loan Losses
Total loans	21,931	24,500
Commercial and industrial | 60 days past due
Loans and Allowance for Loan Losses
Total loans	9,618	11,677
Commercial and industrial | 90 days past due
Loans and Allowance for Loan Losses
Total loans	1,837	1,704
Commercial and industrial | Total Past Due
Loans and Allowance for Loan Losses
Total loans	33,386	37,881
Commercial and industrial | Current
Loans and Allowance for Loan Losses
Total loans	5,257,967	5,258,473
Other income producing property
Loans and Allowance for Loan Losses
Non-Accruing	2,991	2,734
Total loans	721,291	696,242
Other income producing property | 30 days past due
Loans and Allowance for Loan Losses
Total loans	2,224	1,623
Other income producing property | 60 days past due
Loans and Allowance for Loan Losses
Total loans	156	1,480
Other income producing property | 90 days past due
Loans and Allowance for Loan Losses
Total loans	147	298
Other income producing property | Total Past Due
Loans and Allowance for Loan Losses
Total loans	2,527	3,401
Other income producing property | Current
Loans and Allowance for Loan Losses
Total loans	715,773	690,107
Consumer loans
Loans and Allowance for Loan Losses
Non-Accruing	5,282	4,398
Total loans	1,277,549	1,278,426
Consumer loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	13,015	19,713
Consumer loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	8,002	10,655
Consumer loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	1
Consumer loans | Total Past Due
Loans and Allowance for Loan Losses
Total loans	21,018	30,368
Consumer loans | Current
Loans and Allowance for Loan Losses
Total loans	1,251,249	1,243,660
Other loans
Loans and Allowance for Loan Losses
Total loans	7,145	20,989
Other loans | Current
Loans and Allowance for Loan Losses
Total loans	7,145	20,989
Commercial loans
Loans and Allowance for Loan Losses
Total loans	21,575,799	21,430,337
Commercial loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	1,855,548	1,956,300
Commercial loans | Commercial non-owner occupied
Loans and Allowance for Loan Losses
Total loans	8,236,216	8,072,959
Commercial loans | Commercial owner occupied real estate loan
Loans and Allowance for Loan Losses
Total loans	5,522,514	5,460,193
Commercial loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Total loans	33,237	30,741
Commercial loans | Commercial and industrial
Loans and Allowance for Loan Losses
Total loans	5,321,306	5,313,483
Commercial loans | Other income producing property
Loans and Allowance for Loan Losses
Total loans	599,833	575,672
Commercial loans | Other loans
Loans and Allowance for Loan Losses
Total loans	7,145	20,989
Consumer portfolio loans
Loans and Allowance for Loan Losses
Total loans	9,120,343	8,747,525
Consumer portfolio loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	21,921	30,013
Consumer portfolio loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	10,721	14,615
Consumer portfolio loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	10,654	10,472
Consumer portfolio loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	893,742	904,060
Consumer portfolio loans | Construction and land development | 30 days past due
Loans and Allowance for Loan Losses
Total loans	604	125
Consumer portfolio loans | Construction and land development | 60 days past due
Loans and Allowance for Loan Losses
Total loans	114
Consumer portfolio loans | Construction and land development | 90 days past due
Loans and Allowance for Loan Losses
Total loans	1	477
Consumer portfolio loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Total loans	5,495,309	5,131,301
Consumer portfolio loans | Consumer Owner Occupied Loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	4,126	7,215
Consumer portfolio loans | Consumer Owner Occupied Loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	1,706	3,063
Consumer portfolio loans | Consumer Owner Occupied Loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	5,955	5,874
Consumer portfolio loans | Home equity loans
Loans and Allowance for Loan Losses
Total loans	1,332,285	1,313,168
Consumer portfolio loans | Home equity loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	3,789	2,658
Consumer portfolio loans | Home equity loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	774	691
Consumer portfolio loans | Home equity loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	930	1,081
Consumer portfolio loans | Other income producing property
Loans and Allowance for Loan Losses
Total loans	121,458	120,570
Consumer portfolio loans | Other income producing property | 30 days past due
Loans and Allowance for Loan Losses
Total loans	292	62
Consumer portfolio loans | Other income producing property | 60 days past due
Loans and Allowance for Loan Losses
Total loans		23
Consumer portfolio loans | Other income producing property | 90 days past due
Loans and Allowance for Loan Losses
Total loans	256	121
Consumer portfolio loans | Consumer loans
Loans and Allowance for Loan Losses
Total loans	1,277,549	1,278,426
Consumer portfolio loans | Consumer loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	13,110	19,953
Consumer portfolio loans | Consumer loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	8,127	10,838
Consumer portfolio loans | Consumer loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	$ 3,512	$ 2,919