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Loans - Credit impaired 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 and industrial
Summary of Loans
Total loans	5,047,147	1,386,327
Consumer | Consumer
Summary of Loans
Total loans	$ 894,334	663,422
Acquired credit impaired loans
Summary of Loans
Total loans		361,846	$ 489,723
Less allowance for credit losses		(5,064)
Loans, net		356,782
Acquired credit impaired loans | Construction and land development
Summary of Loans
Total loans		25,032	32,942
Acquired credit impaired loans | Consumer
Summary of Loans
Total loans		35,488	42,492
Acquired credit impaired loans | Commercial and industrial
Summary of Loans
Total loans		7,029	10,043
Acquired credit impaired loans | Commercial loans | Real estate
Summary of Loans
Total loans		130,938	196,764
Acquired credit impaired loans | Commercial loans | Construction and land development
Summary of Loans
Total loans		25,032
Acquired credit impaired loans | Commercial loans | Commercial and industrial
Summary of Loans
Total loans		7,029
Acquired credit impaired loans | Consumer | Real estate
Summary of Loans
Total loans		163,359	$ 207,482
Acquired credit impaired loans | Consumer | Consumer
Summary of Loans
Total loans		35,488
Acquired credit impaired loans | Consumer | Commercial and industrial
Summary of Loans
Total loans		$ 7,029

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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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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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