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Loans - Credit risk profile by risk grade of acquired non-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 non-owner occupied
Loans
Total loans	5,931,323	2,323,967
Commercial loans | Commercial and industrial
Loans
Total loans	5,047,147	1,386,327
Commercial loans | Other income producing property
Loans
Total loans	587,448	346,554
Consumer | Consumer Owner Occupied Loans
Loans
Total loans	4,108,042	2,706,960
Consumer | Home equity loans
Loans
Total loans	1,336,689	758,020
Consumer | Consumer
Loans
Total loans	894,334	663,422
Consumer | Other loans
Loans
Total loans	$ 17,993	13,892
Acquired non-credit impaired loans
Loans
Total loans		1,760,427	$ 2,594,826
Acquired non-credit impaired loans | Pass
Loans
Total loans		1,697,942
Acquired non-credit impaired loans | Special mention
Loans
Total loans		39,772
Acquired non-credit impaired loans | Substandard
Loans
Total loans		22,713
Acquired non-credit impaired loans | Construction and land development
Loans
Total loans		33,569	165,070
Acquired non-credit impaired loans | Commercial non-owner occupied
Loans
Total loans		447,441	679,253
Acquired non-credit impaired loans | Commercial owner occupied real estate loan
Loans
Total loans		307,193	421,841
Acquired non-credit impaired loans | Commercial and industrial
Loans
Total loans		101,880	212,537
Acquired non-credit impaired loans | Other income producing property
Loans
Total loans		95,697	133,110
Acquired non-credit impaired loans | Consumer Owner Occupied Loans
Loans
Total loans		496,431	628,813
Acquired non-credit impaired loans | Home equity loans
Loans
Total loans		188,732	242,425
Acquired non-credit impaired loans | Consumer
Loans
Total loans		89,484	$ 111,777
Acquired non-credit impaired loans | Commercial loans
Loans
Total loans		985,780
Acquired non-credit impaired loans | Commercial loans | Pass
Loans
Total loans		950,062
Acquired non-credit impaired loans | Commercial loans | Special mention
Loans
Total loans		27,005
Acquired non-credit impaired loans | Commercial loans | Substandard
Loans
Total loans		8,713
Acquired non-credit impaired loans | Commercial loans | Construction and land development
Loans
Total loans		33,569
Acquired non-credit impaired loans | Commercial loans | Construction and land development | Pass
Loans
Total loans		31,690
Acquired non-credit impaired loans | Commercial loans | Construction and land development | Special mention
Loans
Total loans		966
Acquired non-credit impaired loans | Commercial loans | Construction and land development | Substandard
Loans
Total loans		913
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied
Loans
Total loans		447,441
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied | Pass
Loans
Total loans		432,710
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied | Special mention
Loans
Total loans		14,162
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied | Substandard
Loans
Total loans		569
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan
Loans
Total loans		307,193
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan | Pass
Loans
Total loans		300,678
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan | Special mention
Loans
Total loans		3,092
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan | Substandard
Loans
Total loans		3,423
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial
Loans
Total loans		101,880
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial | Pass
Loans
Total loans		97,092
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial | Special mention
Loans
Total loans		2,948
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial | Substandard
Loans
Total loans		1,840
Acquired non-credit impaired loans | Commercial loans | Other income producing property
Loans
Total loans		95,697
Acquired non-credit impaired loans | Commercial loans | Other income producing property | Pass
Loans
Total loans		87,892
Acquired non-credit impaired loans | Commercial loans | Other income producing property | Special mention
Loans
Total loans		5,837
Acquired non-credit impaired loans | Commercial loans | Other income producing property | Substandard
Loans
Total loans		1,968
Acquired non-credit impaired loans | Consumer
Loans
Total loans		774,647
Acquired non-credit impaired loans | Consumer | Pass
Loans
Total loans		747,880
Acquired non-credit impaired loans | Consumer | Special mention
Loans
Total loans		12,767
Acquired non-credit impaired loans | Consumer | Substandard
Loans
Total loans		14,000
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans
Loans
Total loans		496,431
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans | Pass
Loans
Total loans		486,433
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans | Special mention
Loans
Total loans		6,434
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans | Substandard
Loans
Total loans		3,564
Acquired non-credit impaired loans | Consumer | Home equity loans
Loans
Total loans		188,732
Acquired non-credit impaired loans | Consumer | Home equity loans | Pass
Loans
Total loans		174,912
Acquired non-credit impaired loans | Consumer | Home equity loans | Special mention
Loans
Total loans		5,679
Acquired non-credit impaired loans | Consumer | Home equity loans | Substandard
Loans
Total loans		8,141
Acquired non-credit impaired loans | Consumer | Consumer
Loans
Total loans		89,484
Acquired non-credit impaired loans | Consumer | Consumer | Pass
Loans
Total loans		86,535
Acquired non-credit impaired loans | Consumer | Consumer | Special mention
Loans
Total loans		654
Acquired non-credit impaired loans | Consumer | Consumer | Substandard
Loans
Total loans		$ 2,295

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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