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Loans - Credit risk profile by risk grade of acquired credit impaired loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans
Total loans	$ 24,664,134	$ 11,375,104
Commercial loans | Construction and land development
Loans
Total loans	1,899,066	1,017,261
Commercial loans | Commercial and industrial
Loans
Total loans	5,047,147	1,386,327
Consumer | Consumer
Loans
Total loans	$ 894,334	663,422
Acquired credit impaired loans
Loans
Total loans		361,846	$ 489,723
Acquired credit impaired loans | Pass
Loans
Total loans		218,364
Acquired credit impaired loans | Special mention
Loans
Total loans		58,281
Acquired credit impaired loans | Substandard
Loans
Total loans		85,201
Acquired credit impaired loans | Construction and land development
Loans
Total loans		25,032	32,942
Acquired credit impaired loans | Consumer
Loans
Total loans		35,488	42,492
Acquired credit impaired loans | Commercial and industrial
Loans
Total loans		7,029	10,043
Acquired credit impaired loans | Commercial loans | Real estate
Loans
Total loans		130,938	196,764
Acquired credit impaired loans | Commercial loans | Real estate | Pass
Loans
Total loans		108,762
Acquired credit impaired loans | Commercial loans | Real estate | Special mention
Loans
Total loans		6,465
Acquired credit impaired loans | Commercial loans | Real estate | Substandard
Loans
Total loans		15,711
Acquired credit impaired loans | Commercial loans | Construction and land development
Loans
Total loans		25,032
Acquired credit impaired loans | Commercial loans | Construction and land development | Pass
Loans
Total loans		17,756
Acquired credit impaired loans | Commercial loans | Construction and land development | Special mention
Loans
Total loans		2,904
Acquired credit impaired loans | Commercial loans | Construction and land development | Substandard
Loans
Total loans		4,372
Acquired credit impaired loans | Commercial loans | Commercial and industrial
Loans
Total loans		7,029
Acquired credit impaired loans | Consumer | Real estate
Loans
Total loans		163,359	$ 207,482
Acquired credit impaired loans | Consumer | Real estate | Pass
Loans
Total loans		82,203
Acquired credit impaired loans | Consumer | Real estate | Special mention
Loans
Total loans		35,968
Acquired credit impaired loans | Consumer | Real estate | Substandard
Loans
Total loans		45,188
Acquired credit impaired loans | Consumer | Consumer
Loans
Total loans		35,488
Acquired credit impaired loans | Consumer | Consumer | Pass
Loans
Total loans		4,483
Acquired credit impaired loans | Consumer | Consumer | Special mention
Loans
Total loans		12,658
Acquired credit impaired loans | Consumer | Consumer | Substandard
Loans
Total loans		18,347
Acquired credit impaired loans | Consumer | Commercial and industrial
Loans
Total loans		7,029
Acquired credit impaired loans | Consumer | Commercial and industrial | Pass
Loans
Total loans		5,160
Acquired credit impaired loans | Consumer | Commercial and industrial | Special mention
Loans
Total loans		286
Acquired credit impaired loans | Consumer | Commercial and industrial | Substandard
Loans
Total loans		$ 1,583

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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