Loans - Aging analysis of past due loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Loans and Allowance for Loan Losses
Non-Accruing	$ 165,506	$ 104,225
Total loans	31,536,785	30,177,862
30 days past due
Loans and Allowance for Loan Losses
Total loans	58,631	68,416
60 days past due
Loans and Allowance for Loan Losses
Total loans	20,348	31,607
90 days past due
Loans and Allowance for Loan Losses
Total loans	4,191	4,350
Total Past Due
Loans and Allowance for Loan Losses
Total loans	83,170	104,373
Current
Loans and Allowance for Loan Losses
Total loans	31,288,109	29,969,264
Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	24,990,889	22,805,039
Construction and land development
Loans and Allowance for Loan Losses
Non-Accruing	344	827
Total loans	2,817,125	2,860,360
Construction and land development | 30 days past due
Loans and Allowance for Loan Losses
Total loans	936	2,146
Construction and land development | 60 days past due
Loans and Allowance for Loan Losses
Total loans	105	3,653
Construction and land development | 90 days past due
Loans and Allowance for Loan Losses
Total loans	217
Construction and land development | Total Past Due
Loans and Allowance for Loan Losses
Total loans	1,258	5,799
Construction and land development | Current
Loans and Allowance for Loan Losses
Total loans	2,815,523	2,853,734
Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Non-Accruing	19,890	17,307
Total loans	5,927,781	5,162,042
Consumer Owner Occupied Loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	3,727	6,001
Consumer Owner Occupied Loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	2,052	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	5,779	6,785
Consumer Owner Occupied Loans | Current
Loans and Allowance for Loan Losses
Total loans	5,902,112	5,137,950
Home equity loans
Loans and Allowance for Loan Losses
Non-Accruing	4,707	6,316
Total loans	1,347,714	1,313,168
Home equity loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	1,876	2,527
Home equity loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	595	361
Home equity loans | Total Past Due
Loans and Allowance for Loan Losses
Total loans	2,471	2,888
Home equity loans | Current
Loans and Allowance for Loan Losses
Total loans	1,340,536	1,303,964
Commercial and industrial
Loans and Allowance for Loan Losses
Non-Accruing	59,377	17,129
Total loans	5,378,294	5,313,483
Commercial and industrial | 30 days past due
Loans and Allowance for Loan Losses
Total loans	26,794	24,500
Commercial and industrial | 60 days past due
Loans and Allowance for Loan Losses
Total loans	7,006	11,677
Commercial and industrial | 90 days past due
Loans and Allowance for Loan Losses
Total loans	2,466	1,704
Commercial and industrial | Total Past Due
Loans and Allowance for Loan Losses
Total loans	36,266	37,881
Commercial and industrial | Current
Loans and Allowance for Loan Losses
Total loans	5,282,651	5,258,473
Other income producing property
Loans and Allowance for Loan Losses
Non-Accruing	3,796	2,734
Total loans	711,712	696,242
Other income producing property | 30 days past due
Loans and Allowance for Loan Losses
Total loans	1,713	1,623
Other income producing property | 60 days past due
Loans and Allowance for Loan Losses
Total loans		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	1,713	3,401
Other income producing property | Current
Loans and Allowance for Loan Losses
Total loans	706,203	690,107
Consumer loans
Loans and Allowance for Loan Losses
Non-Accruing	4,888	4,398
Total loans	1,285,478	1,278,426
Consumer loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	15,406	19,713
Consumer loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	9,055	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	24,462	30,368
Consumer loans | Current
Loans and Allowance for Loan Losses
Total loans	1,256,128	1,243,660
Other loans
Loans and Allowance for Loan Losses
Total loans	6,494	20,989
Other loans | Current
Loans and Allowance for Loan Losses
Total loans	6,494	20,989
Commercial loans
Loans and Allowance for Loan Losses
Total loans	21,966,751	21,430,337
Commercial loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	1,888,746	1,956,300
Commercial loans | Commercial non-owner occupied
Loans and Allowance for Loan Losses
Non-Accruing	23,891	20,425
Total loans	8,476,236	8,072,959
Commercial loans | Commercial non-owner occupied | 30 days past due
Loans and Allowance for Loan Losses
Total loans	1,075	1,158
Commercial loans | Commercial non-owner occupied | 60 days past due
Loans and Allowance for Loan Losses
Total loans	109	978
Commercial loans | Commercial non-owner occupied | 90 days past due
Loans and Allowance for Loan Losses
Total loans	245	77
Commercial loans | Commercial non-owner occupied | Total Past Due
Loans and Allowance for Loan Losses
Total loans	1,429	2,213
Commercial loans | Commercial non-owner occupied | Current
Loans and Allowance for Loan Losses
Total loans	8,450,916	8,050,321
Commercial loans | Commercial owner occupied real estate loan
Loans and Allowance for Loan Losses
Non-Accruing	48,613	35,089
Total loans	5,585,951	5,460,193
Commercial loans | Commercial owner occupied real estate loan | 30 days past due
Loans and Allowance for Loan Losses
Total loans	7,104	10,748
Commercial loans | Commercial owner occupied real estate loan | 60 days past due
Loans and Allowance for Loan Losses
Total loans	1,426	2,059
Commercial loans | Commercial owner occupied real estate loan | 90 days past due
Loans and Allowance for Loan Losses
Total loans	1,262	2,231
Commercial loans | Commercial owner occupied real estate loan | Total Past Due
Loans and Allowance for Loan Losses
Total loans	9,792	15,038
Commercial loans | Commercial owner occupied real estate loan | Current
Loans and Allowance for Loan Losses
Total loans	5,527,546	5,410,066
Commercial loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Total loans	38,733	30,741
Commercial loans | Commercial and industrial
Loans and Allowance for Loan Losses
Total loans	5,378,294	5,313,483
Commercial loans | Other income producing property
Loans and Allowance for Loan Losses
Total loans	592,297	575,672
Commercial loans | Other loans
Loans and Allowance for Loan Losses
Total loans	6,494	20,989
Consumer portfolio loans
Loans and Allowance for Loan Losses
Total loans	9,570,034	8,747,525
Consumer portfolio loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	23,476	30,013
Consumer portfolio loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	13,632	14,615
Consumer portfolio loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	10,708	10,472
Consumer portfolio loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	928,379	904,060
Consumer portfolio loans | Construction and land development | 30 days past due
Loans and Allowance for Loan Losses
Total loans	170	125
Consumer portfolio loans | Construction and land development | 60 days past due
Loans and Allowance for Loan Losses
Total loans	65
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	5,889,048	5,131,301
Consumer portfolio loans | Consumer Owner Occupied Loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	5,420	7,215
Consumer portfolio loans | Consumer Owner Occupied Loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	3,046	3,063
Consumer portfolio loans | Consumer Owner Occupied Loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	6,431	5,874
Consumer portfolio loans | Home equity loans
Loans and Allowance for Loan Losses
Total loans	1,347,714	1,313,168
Consumer portfolio loans | Home equity loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	2,252	2,658
Consumer portfolio loans | Home equity loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	1,278	691
Consumer portfolio loans | Home equity loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	864	1,081
Consumer portfolio loans | Other income producing property
Loans and Allowance for Loan Losses
Total loans	119,415	120,570
Consumer portfolio loans | Other income producing property | 30 days past due
Loans and Allowance for Loan Losses
Total loans	61	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	255	121
Consumer portfolio loans | Consumer loans
Loans and Allowance for Loan Losses
Total loans	1,285,478	1,278,426
Consumer portfolio loans | Consumer loans | 30 days past due
Loans and Allowance for Loan Losses
Total loans	15,573	19,953
Consumer portfolio loans | Consumer loans | 60 days past due
Loans and Allowance for Loan Losses
Total loans	9,243	10,838
Consumer portfolio loans | Consumer loans | 90 days past due
Loans and Allowance for Loan Losses
Total loans	$ 3,157	$ 2,919