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Loans - Aging analysis of past due loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans and Allowance for Loan Losses
Past due	$ 61,216
Current	24,507,730
Non-Accruing	95,188
Total loans - ASU 2016-13	24,664,134
Greater than 90 Days Accruing	11,651
30 days past due
Loans and Allowance for Loan Losses
Past due	20,185
60 days past due
Loans and Allowance for Loan Losses
Past due	29,380
90 days past due
Loans and Allowance for Loan Losses
Past due	11,651
Non-acquired loans
Loans and Allowance for Loan Losses
Past due		$ 22,696
Current		9,230,135
Total loans - ASU 2016-13	12,289,456	9,252,831
Non-acquired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		13,535
Non-acquired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		1,387
Non-acquired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		7,774
Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due		13,916
Current		1,746,511
Total loans - ASU 2016-13		1,760,427
Acquired non-credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		3,147
Acquired non-credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		7,180
Acquired non-credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		3,589
Acquired credit impaired loans
Loans and Allowance for Loan Losses
Past due		17,460
Current		344,386
Total loans - ASU 2016-13		361,846
Acquired credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		6,059
Acquired credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		2,169
Acquired credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		9,232
Construction and land development
Loans and Allowance for Loan Losses
Past due	1,662
Current	1,894,983
Non-Accruing	2,421
Total loans - ASU 2016-13	1,899,066
Construction and land development \| 30 days past due
Loans and Allowance for Loan Losses
Past due	520
Construction and land development \| 60 days past due
Loans and Allowance for Loan Losses
Past due	1,142
Commercial non-owner occupied
Loans and Allowance for Loan Losses
Past due	1,031
Current	5,925,696
Non-Accruing	4,596
Total loans - ASU 2016-13	5,931,323
Commercial non-owner occupied \| 30 days past due
Loans and Allowance for Loan Losses
Past due	188
Commercial non-owner occupied \| 60 days past due
Loans and Allowance for Loan Losses
Past due	372
Commercial non-owner occupied \| 90 days past due
Loans and Allowance for Loan Losses
Past due	471
Commercial owner occupied real estate loan
Loans and Allowance for Loan Losses
Past due	3,740
Current	4,812,293
Non-Accruing	26,059
Total loans - ASU 2016-13	4,842,092
Commercial owner occupied real estate loan \| 30 days past due
Loans and Allowance for Loan Losses
Past due	2,900
Commercial owner occupied real estate loan \| 60 days past due
Loans and Allowance for Loan Losses
Past due	840
Residential real estate \| Acquired credit impaired loans
Loans and Allowance for Loan Losses
Past due		9,385
Current		153,974
Total loans - ASU 2016-13		163,359
Residential real estate \| Acquired credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		2,838
Residential real estate \| Acquired credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		976
Residential real estate \| Acquired credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		5,571
Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Past due	5,041
Current	4,072,255
Non-Accruing	30,746
Total loans - ASU 2016-13	4,108,042
Consumer Owner Occupied Loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due	1,375
Consumer Owner Occupied Loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due	3,632
Consumer Owner Occupied Loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due	34
Home equity loans
Loans and Allowance for Loan Losses
Past due	2,286
Current	1,324,459
Non-Accruing	9,944
Total loans - ASU 2016-13	1,336,689
Home equity loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due	1,805
Home equity loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due	481
Commercial and industrial
Loans and Allowance for Loan Losses
Past due	43,932
Current	4,993,997
Non-Accruing	9,218
Total loans - ASU 2016-13	5,047,147
Commercial and industrial \| 30 days past due
Loans and Allowance for Loan Losses
Past due	10,979
Commercial and industrial \| 60 days past due
Loans and Allowance for Loan Losses
Past due	22,089
Commercial and industrial \| 90 days past due
Loans and Allowance for Loan Losses
Past due	10,864
Other income producing property
Loans and Allowance for Loan Losses
Past due	965
Current	580,353
Non-Accruing	6,130
Total loans - ASU 2016-13	587,448
Other income producing property \| 30 days past due
Loans and Allowance for Loan Losses
Past due	687
Other income producing property \| 90 days past due
Loans and Allowance for Loan Losses
Past due	278
Other income producing property \| Non-acquired loans
Loans and Allowance for Loan Losses
Past due		665
Current		217,952
Total loans - ASU 2016-13		218,617
Other income producing property \| Non-acquired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		208
Other income producing property \| Non-acquired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		457
Other income producing property \| Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due		5,238
Current		90,459
Total loans - ASU 2016-13		95,697
Other income producing property \| Acquired non-credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		378
Other income producing property \| Acquired non-credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		4,309
Other income producing property \| Acquired non-credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		551
Consumer
Loans and Allowance for Loan Losses
Past due	2,540
Current	885,720
Non-Accruing	6,074
Total loans - ASU 2016-13	894,334
Consumer \| 30 days past due
Loans and Allowance for Loan Losses
Past due	1,718
Consumer \| 60 days past due
Loans and Allowance for Loan Losses
Past due	818
Consumer \| 90 days past due
Loans and Allowance for Loan Losses
Past due	4
Other loans
Loans and Allowance for Loan Losses
Past due	19
Current	17,974
Total loans - ASU 2016-13	17,993
Other loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due	13
Other loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due	6
Commercial loans
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	17,657,996
Commercial loans \| Non-acquired loans
Loans and Allowance for Loan Losses
Past due		6,280
Current		1,274,579
Total loans - ASU 2016-13		1,280,859
Commercial loans \| Non-acquired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		5,531
Commercial loans \| Non-acquired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		100
Commercial loans \| Non-acquired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		649
Commercial loans \| Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due		2,290
Current		304,903
Total loans - ASU 2016-13		307,193
Commercial loans \| Acquired non-credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		890
Commercial loans \| Acquired non-credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		702
Commercial loans \| Acquired non-credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		698
Commercial loans \| Acquired credit impaired loans
Loans and Allowance for Loan Losses
Past due		1,103
Current		5,926
Total loans - ASU 2016-13		7,029
Commercial loans \| Acquired credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		118
Commercial loans \| Acquired credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		910
Commercial loans \| Acquired credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		75
Commercial loans \| Construction and land development
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	1,238,265
Commercial loans \| Construction and land development \| Non-acquired loans
Loans and Allowance for Loan Losses
Past due		615
Current		967,745
Total loans - ASU 2016-13		968,360
Commercial loans \| Construction and land development \| Non-acquired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		321
Commercial loans \| Construction and land development \| Non-acquired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		39
Commercial loans \| Construction and land development \| Non-acquired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		255
Commercial loans \| Construction and land development \| Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due		276
Current		33,293
Total loans - ASU 2016-13		33,569
Commercial loans \| Construction and land development \| Acquired non-credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		20
Commercial loans \| Construction and land development \| Acquired non-credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		256
Commercial loans \| Construction and land development \| Acquired credit impaired loans
Loans and Allowance for Loan Losses
Past due		393
Current		24,639
Total loans - ASU 2016-13		25,032
Commercial loans \| Construction and land development \| Acquired credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		393
Commercial loans \| Commercial non-owner occupied
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	5,931,323
Greater than 90 Days Accruing	471
Commercial loans \| Commercial non-owner occupied \| Non-acquired loans
Loans and Allowance for Loan Losses
Past due		413
Current		1,810,725
Total loans - ASU 2016-13		1,811,138
Commercial loans \| Commercial non-owner occupied \| Non-acquired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		114
Commercial loans \| Commercial non-owner occupied \| Non-acquired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		299
Commercial loans \| Commercial non-owner occupied \| Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due		1,366
Current		446,075
Total loans - ASU 2016-13		447,441
Commercial loans \| Commercial non-owner occupied \| Acquired non-credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		144
Commercial loans \| Commercial non-owner occupied \| Acquired non-credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		1,146
Commercial loans \| Commercial non-owner occupied \| Acquired non-credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		76
Commercial loans \| Commercial non-owner occupied \| Acquired credit impaired loans
Loans and Allowance for Loan Losses
Past due		4,942
Current		125,996
Total loans - ASU 2016-13		130,938
Commercial loans \| Commercial non-owner occupied \| Acquired credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		2,283
Commercial loans \| Commercial non-owner occupied \| Acquired credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		2,659
Commercial loans \| Commercial owner occupied real estate loan
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	4,842,092
Commercial loans \| Commercial owner occupied real estate loan \| Non-acquired loans
Loans and Allowance for Loan Losses
Past due		6,949
Current		1,777,068
Total loans - ASU 2016-13		1,784,017
Commercial loans \| Commercial owner occupied real estate loan \| Non-acquired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		4,011
Commercial loans \| Commercial owner occupied real estate loan \| Non-acquired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		636
Commercial loans \| Commercial owner occupied real estate loan \| Non-acquired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		2,302
Commercial loans \| Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	35,137
Commercial loans \| Commercial and industrial
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	5,047,147
Greater than 90 Days Accruing	10,864
Commercial loans \| Commercial and industrial \| Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due		314
Current		101,566
Total loans - ASU 2016-13		101,880
Commercial loans \| Commercial and industrial \| Acquired non-credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		93
Commercial loans \| Commercial and industrial \| Acquired non-credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		204
Commercial loans \| Commercial and industrial \| Acquired non-credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		17
Commercial loans \| Other income producing property
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	546,039
Greater than 90 Days Accruing	278
Commercial loans \| Other loans
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	17,993
Consumer
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	7,006,138
Consumer \| 30 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	49,578
Consumer \| 60 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	7,456
Consumer \| 90 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	14,622
Consumer \| Acquired credit impaired loans
Loans and Allowance for Loan Losses
Past due		1,637
Current		33,851
Total loans - ASU 2016-13		35,488
Consumer \| Acquired credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		820
Consumer \| Acquired credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		283
Consumer \| Acquired credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		534
Consumer \| Construction and land development
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	660,801
Consumer \| Construction and land development \| 30 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	12,432
Consumer \| Construction and land development \| 60 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	720
Consumer \| Construction and land development \| 90 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	52
Consumer \| Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	4,072,905
Greater than 90 Days Accruing	34
Consumer \| Consumer Owner Occupied Loans \| 30 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	31,907
Consumer \| Consumer Owner Occupied Loans \| 60 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	5,364
Consumer \| Consumer Owner Occupied Loans \| 90 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	7,858
Consumer \| Consumer Owner Occupied Loans \| Non-acquired loans
Loans and Allowance for Loan Losses
Past due		3,866
Current		2,114,973
Total loans - ASU 2016-13		2,118,839
Consumer \| Consumer Owner Occupied Loans \| Non-acquired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		1,157
Consumer \| Consumer Owner Occupied Loans \| Non-acquired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		285
Consumer \| Consumer Owner Occupied Loans \| Non-acquired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		2,424
Consumer \| Consumer Owner Occupied Loans \| Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due		1,333
Current		495,098
Total loans - ASU 2016-13		496,431
Consumer \| Consumer Owner Occupied Loans \| Acquired non-credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		768
Consumer \| Consumer Owner Occupied Loans \| Acquired non-credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		151
Consumer \| Consumer Owner Occupied Loans \| Acquired non-credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		414
Consumer \| Home equity loans
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	1,336,689
Consumer \| Home equity loans \| 30 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	2,861
Consumer \| Home equity loans \| 60 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	534
Consumer \| Home equity loans \| 90 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	4,123
Consumer \| Home equity loans \| Non-acquired loans
Loans and Allowance for Loan Losses
Past due		1,944
Current		516,684
Total loans - ASU 2016-13		518,628
Consumer \| Home equity loans \| Non-acquired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		1,343
Consumer \| Home equity loans \| Non-acquired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		39
Consumer \| Home equity loans \| Non-acquired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		562
Consumer \| Home equity loans \| Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due		1,578
Current		187,154
Total loans - ASU 2016-13		188,732
Consumer \| Home equity loans \| Acquired non-credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		369
Consumer \| Home equity loans \| Acquired non-credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		55
Consumer \| Home equity loans \| Acquired non-credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		1,154
Consumer \| Other income producing property
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	41,409
Consumer \| Other income producing property \| 30 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	27
Consumer \| Other income producing property \| 60 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	13
Consumer \| Other income producing property \| 90 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	1
Consumer \| Consumer
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	894,334
Greater than 90 Days Accruing	4
Consumer \| Consumer \| 30 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	2,351
Consumer \| Consumer \| 60 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	825
Consumer \| Consumer \| 90 days past due
Loans and Allowance for Loan Losses
Total loans - ASU 2016-13	$ 2,588
Consumer \| Consumer \| Non-acquired loans
Loans and Allowance for Loan Losses
Past due		1,936
Current		536,545
Total loans - ASU 2016-13		538,481
Consumer \| Consumer \| Non-acquired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		825
Consumer \| Consumer \| Non-acquired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		285
Consumer \| Consumer \| Non-acquired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		826
Consumer \| Consumer \| Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due		1,521
Current		87,963
Total loans - ASU 2016-13		89,484
Consumer \| Consumer \| Acquired non-credit impaired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		485
Consumer \| Consumer \| Acquired non-credit impaired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		613
Consumer \| Consumer \| Acquired non-credit impaired loans \| 90 days past due
Loans and Allowance for Loan Losses
Past due		423
Consumer \| Other loans \| Non-acquired loans
Loans and Allowance for Loan Losses
Past due		28
Current		13,864
Total loans - ASU 2016-13		13,892
Consumer \| Other loans \| Non-acquired loans \| 30 days past due
Loans and Allowance for Loan Losses
Past due		25
Consumer \| Other loans \| Non-acquired loans \| 60 days past due
Loans and Allowance for Loan Losses
Past due		$ 3