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Loans - Summary of loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of Loans
Total loans - ASU 2016-13	$ 24,664,134
Total loans	24,664,134	$ 11,375,104
Less allowance for credit losses	(457,309)	(56,927)
Loans, net	24,206,825	11,313,113
Deferred fees	35,600
Accrued interest receivable (AIR)	93,900
Acquired credit impaired loans
Summary of Loans
Total loans - ASU 2016-13		361,846
Total loans		361,846	$ 489,723
Less allowance for credit losses		(5,064)
Loans, net		356,782
Previous Accounting Guidance [Member]
Summary of Loans
Less allowance for credit losses		(61,991)
Unamortized Discounts	97,700
Construction and land development
Summary of Loans
Total loans - ASU 2016-13	1,899,066
Construction and land development | Acquired credit impaired loans
Summary of Loans
Total loans		25,032	32,942
Commercial non-owner occupied
Summary of Loans
Total loans - ASU 2016-13	5,931,323
Consumer Owner Occupied Loans
Summary of Loans
Total loans - ASU 2016-13	4,108,042
Home equity loans
Summary of Loans
Total loans - ASU 2016-13	1,336,689
Commercial owner occupied real estate loan
Summary of Loans
Total loans - ASU 2016-13	4,842,092
Commercial and industrial
Summary of Loans
Total loans - ASU 2016-13	5,047,147
Commercial and industrial | Acquired credit impaired loans
Summary of Loans
Total loans		7,029	10,043
Other income producing property
Summary of Loans
Total loans - ASU 2016-13	587,448
Consumer
Summary of Loans
Total loans - ASU 2016-13	894,334
Consumer | Acquired credit impaired loans
Summary of Loans
Total loans		35,488	42,492
Other loans
Summary of Loans
Total loans - ASU 2016-13	17,993
Commercial loans
Summary of Loans
Total loans - ASU 2016-13	17,657,996
Commercial loans | Acquired credit impaired loans
Summary of Loans
Total loans - ASU 2016-13		7,029
Commercial loans | Construction and land development
Summary of Loans
Total loans - ASU 2016-13	1,238,265
Total loans	1,899,066	1,017,261
Commercial loans | Construction and land development | Acquired credit impaired loans
Summary of Loans
Total loans - ASU 2016-13		25,032
Total loans		25,032
Commercial loans | Commercial non-owner occupied
Summary of Loans
Total loans - ASU 2016-13	5,931,323
Total loans	5,931,323	2,323,967
Commercial loans | Commercial non-owner occupied | Acquired credit impaired loans
Summary of Loans
Total loans - ASU 2016-13		130,938
Commercial loans | Commercial non-owner occupied real estate
Summary of Loans
Total loans	4,842,092	2,158,701
Commercial loans | Consumer Owner Occupied Loans
Summary of Loans
Total loans - ASU 2016-13	35,137
Commercial loans | Real estate | Acquired credit impaired loans
Summary of Loans
Total loans		130,938	196,764
Commercial loans | Commercial owner occupied real estate loan
Summary of Loans
Total loans - ASU 2016-13	4,842,092
Commercial loans | Commercial and industrial
Summary of Loans
Total loans - ASU 2016-13	5,047,147
Total loans	5,047,147	1,386,327
Commercial loans | Commercial and industrial | Acquired credit impaired loans
Summary of Loans
Total loans		7,029
Commercial loans | Other income producing property
Summary of Loans
Total loans - ASU 2016-13	546,039
Total loans	587,448	346,554
Commercial loans | Other loans
Summary of Loans
Total loans - ASU 2016-13	17,993
Consumer
Summary of Loans
Total loans - ASU 2016-13	7,006,138
Consumer | Acquired credit impaired loans
Summary of Loans
Total loans - ASU 2016-13		35,488
Consumer | Construction and land development
Summary of Loans
Total loans - ASU 2016-13	660,801
Consumer | Consumer Owner Occupied Loans
Summary of Loans
Total loans - ASU 2016-13	4,072,905
Total loans	4,108,042	2,706,960
Consumer | Home equity loans
Summary of Loans
Total loans - ASU 2016-13	1,336,689
Total loans	1,336,689	758,020
Consumer | Real estate | Acquired credit impaired loans
Summary of Loans
Total loans		163,359	$ 207,482
Consumer | Commercial and industrial | Acquired credit impaired loans
Summary of Loans
Total loans		7,029
Consumer | Other income producing property
Summary of Loans
Total loans - ASU 2016-13	41,409
Consumer | Consumer
Summary of Loans
Total loans - ASU 2016-13	894,334
Total loans	894,334	663,422
Consumer | Consumer | Acquired credit impaired loans
Summary of Loans
Total loans		35,488
Consumer | Other loans
Summary of Loans
Total loans	$ 17,993	$ 13,892

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