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Loans - Summary of non-acquired loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of Loans
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
Commercial loans | Construction and land development
Summary of Loans
Total loans	1,899,066	1,017,261
Commercial loans | Commercial non-owner occupied
Summary of Loans
Total loans	5,931,323	2,323,967
Commercial loans | Commercial non-owner occupied real estate
Summary of Loans
Total loans	4,842,092	2,158,701
Commercial loans | Commercial and industrial
Summary of Loans
Total loans	5,047,147	1,386,327
Commercial loans | Other income producing property
Summary of Loans
Total loans	587,448	346,554
Consumer | Consumer Owner Occupied Loans
Summary of Loans
Total loans	4,108,042	2,706,960
Consumer | Home equity loans
Summary of Loans
Total loans	1,336,689	758,020
Consumer | Consumer
Summary of Loans
Total loans	894,334	663,422
Consumer | Other loans
Summary of Loans
Total loans	$ 17,993	13,892
Non-acquired loans
Summary of Loans
Total loans		9,252,831	$ 7,933,286
Less allowance for credit losses		(56,927)
Loans, net		9,195,904
Non-acquired loans | Construction and land development
Summary of Loans
Total loans		968,360	841,445
Non-acquired loans | Commercial non-owner occupied
Summary of Loans
Total loans		1,811,138	1,415,551
Non-acquired loans | Consumer Owner Occupied Loans
Summary of Loans
Total loans		2,118,839	1,936,265
Non-acquired loans | Home equity loans
Summary of Loans
Total loans		518,628	495,148
Non-acquired loans | Commercial owner occupied real estate loan
Summary of Loans
Total loans		1,784,017	1,517,551
Non-acquired loans | Commercial and industrial
Summary of Loans
Total loans		1,280,859	1,054,952
Non-acquired loans | Other income producing property
Summary of Loans
Total loans		218,617	214,353
Non-acquired loans | Consumer
Summary of Loans
Total loans		538,481	448,664
Non-acquired loans | Other loans
Summary of Loans
Total loans		13,892	$ 9,357
Non-acquired loans | Commercial loans
Summary of Loans
Total loans		6,062,991
Non-acquired loans | Commercial loans | Construction and land development
Summary of Loans
Total loans		968,360
Non-acquired loans | Commercial loans | Commercial non-owner occupied
Summary of Loans
Total loans		1,811,138
Non-acquired loans | Commercial loans | Commercial non-owner occupied real estate
Summary of Loans
Total loans		2,779,498
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan
Summary of Loans
Total loans		1,784,017
Non-acquired loans | Commercial loans | Commercial and industrial
Summary of Loans
Total loans		1,280,859
Non-acquired loans | Commercial loans | Other income producing property
Summary of Loans
Total loans		218,617
Non-acquired loans | Consumer
Summary of Loans
Total loans		3,189,840
Non-acquired loans | Consumer | Consumer Owner Occupied Loans
Summary of Loans
Total loans		2,118,839
Non-acquired loans | Consumer | Home equity loans
Summary of Loans
Total loans		518,628
Non-acquired loans | Consumer | Real estate
Summary of Loans
Total loans		2,637,467
Non-acquired loans | Consumer | Consumer
Summary of Loans
Total loans		538,481
Non-acquired loans | Consumer | Other loans
Summary of Loans
Total loans		$ 13,892

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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