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Loans - Credit risk profile by risk grade of non acquired loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans
Total loans	$ 24,664,134	$ 11,375,104
Total loans - ASU 2016-13	24,664,134
Other Real Estate, Non Covered	47,920	11,964	$ 11,410	$ 11,203
Construction and land development
Loans
Total loans - ASU 2016-13	1,899,066
Commercial non-owner occupied
Loans
Total loans - ASU 2016-13	5,931,323
Commercial owner occupied real estate loan
Loans
Total loans - ASU 2016-13	4,842,092
Commercial and industrial
Loans
Total loans - ASU 2016-13	5,047,147
Other income producing property
Loans
Total loans - ASU 2016-13	587,448
Consumer Owner Occupied Loans
Loans
Total loans - ASU 2016-13	4,108,042
Home equity loans
Loans
Total loans - ASU 2016-13	1,336,689
Consumer
Loans
Total loans - ASU 2016-13	894,334
Other loans
Loans
Total loans - ASU 2016-13	17,993
Commercial loans
Loans
Total loans - ASU 2016-13	17,657,996
Commercial loans | Pass
Loans
Total loans - ASU 2016-13	16,665,456
Commercial loans | Special mention
Loans
Total loans - ASU 2016-13	671,626
Commercial loans | Substandard
Loans
Total loans - ASU 2016-13	320,880
Commercial loans | Doubtful
Loans
Total loans - ASU 2016-13	34
Commercial loans | Construction and land development
Loans
Total loans	1,899,066	1,017,261
Total loans - ASU 2016-13	1,238,265
Commercial loans | Construction and land development | Pass
Loans
Total loans - ASU 2016-13	1,190,196
Commercial loans | Construction and land development | Special mention
Loans
Total loans - ASU 2016-13	38,152
Commercial loans | Construction and land development | Substandard
Loans
Total loans - ASU 2016-13	9,909
Commercial loans | Construction and land development | Doubtful
Loans
Total loans - ASU 2016-13	8
Commercial loans | Commercial non-owner occupied
Loans
Total loans	5,931,323	2,323,967
Total loans - ASU 2016-13	5,931,323
Commercial loans | Commercial non-owner occupied | Pass
Loans
Total loans - ASU 2016-13	5,318,569
Commercial loans | Commercial non-owner occupied | Special mention
Loans
Total loans - ASU 2016-13	445,290
Commercial loans | Commercial non-owner occupied | Substandard
Loans
Total loans - ASU 2016-13	167,460
Commercial loans | Commercial non-owner occupied | Doubtful
Loans
Total loans - ASU 2016-13	4
Commercial loans | Commercial owner occupied real estate loan
Loans
Total loans - ASU 2016-13	4,842,092
Commercial loans | Commercial owner occupied real estate loan | Pass
Loans
Total loans - ASU 2016-13	4,631,256
Commercial loans | Commercial owner occupied real estate loan | Special mention
Loans
Total loans - ASU 2016-13	112,848
Commercial loans | Commercial owner occupied real estate loan | Substandard
Loans
Total loans - ASU 2016-13	97,982
Commercial loans | Commercial owner occupied real estate loan | Doubtful
Loans
Total loans - ASU 2016-13	6
Commercial loans | Commercial and industrial
Loans
Total loans	5,047,147	1,386,327
Total loans - ASU 2016-13	5,047,147
Commercial loans | Commercial and industrial | Pass
Loans
Total loans - ASU 2016-13	4,968,038
Commercial loans | Commercial and industrial | Special mention
Loans
Total loans - ASU 2016-13	52,704
Commercial loans | Commercial and industrial | Substandard
Loans
Total loans - ASU 2016-13	26,395
Commercial loans | Commercial and industrial | Doubtful
Loans
Total loans - ASU 2016-13	10
Commercial loans | Other income producing property
Loans
Total loans	587,448	346,554
Total loans - ASU 2016-13	546,039
Commercial loans | Other income producing property | Pass
Loans
Total loans - ASU 2016-13	509,724
Commercial loans | Other income producing property | Special mention
Loans
Total loans - ASU 2016-13	18,148
Commercial loans | Other income producing property | Substandard
Loans
Total loans - ASU 2016-13	18,161
Commercial loans | Other income producing property | Doubtful
Loans
Total loans - ASU 2016-13	6
Commercial loans | Consumer Owner Occupied Loans
Loans
Total loans - ASU 2016-13	35,137
Commercial loans | Consumer Owner Occupied Loans | Pass
Loans
Total loans - ASU 2016-13	29,680
Commercial loans | Consumer Owner Occupied Loans | Special mention
Loans
Total loans - ASU 2016-13	4,484
Commercial loans | Consumer Owner Occupied Loans | Substandard
Loans
Total loans - ASU 2016-13	973
Commercial loans | Other loans
Loans
Total loans - ASU 2016-13	17,993
Commercial loans | Other loans | Pass
Loans
Total loans - ASU 2016-13	17,993
Consumer
Loans
Total loans - ASU 2016-13	7,006,138
Consumer | Construction and land development
Loans
Total loans - ASU 2016-13	660,801
Consumer | Other income producing property
Loans
Total loans - ASU 2016-13	41,409
Consumer | Consumer Owner Occupied Loans
Loans
Total loans	4,108,042	2,706,960
Total loans - ASU 2016-13	4,072,905
Consumer | Home equity loans
Loans
Total loans	1,336,689	758,020
Total loans - ASU 2016-13	1,336,689
Consumer | Consumer
Loans
Total loans	894,334	663,422
Total loans - ASU 2016-13	894,334
Consumer | Other loans
Loans
Total loans	17,993	13,892
Non-acquired loans
Loans
Total loans		9,252,831	7,933,286
Total loans - ASU 2016-13	$ 12,289,456	9,252,831
Non-acquired loans | Pass
Loans
Total loans		9,123,097
Non-acquired loans | Special mention
Loans
Total loans		83,830
Non-acquired loans | Substandard
Loans
Total loans		45,904
Non-acquired loans | Construction and land development
Loans
Total loans		968,360	841,445
Non-acquired loans | Commercial non-owner occupied
Loans
Total loans		1,811,138	1,415,551
Non-acquired loans | Commercial owner occupied real estate loan
Loans
Total loans		1,784,017	1,517,551
Non-acquired loans | Commercial and industrial
Loans
Total loans		1,280,859	1,054,952
Non-acquired loans | Other income producing property
Loans
Total loans		218,617	214,353
Total loans - ASU 2016-13		218,617
Non-acquired loans | Consumer Owner Occupied Loans
Loans
Total loans		2,118,839	1,936,265
Non-acquired loans | Home equity loans
Loans
Total loans		518,628	495,148
Non-acquired loans | Consumer
Loans
Total loans		538,481	448,664
Non-acquired loans | Other loans
Loans
Total loans		13,892	$ 9,357
Non-acquired loans | Commercial loans
Loans
Total loans		6,062,991
Total loans - ASU 2016-13		1,280,859
Non-acquired loans | Commercial loans | Pass
Loans
Total loans		5,971,069
Non-acquired loans | Commercial loans | Special mention
Loans
Total loans		69,268
Non-acquired loans | Commercial loans | Substandard
Loans
Total loans		22,654
Non-acquired loans | Commercial loans | Construction and land development
Loans
Total loans		968,360
Total loans - ASU 2016-13		968,360
Non-acquired loans | Commercial loans | Construction and land development | Pass
Loans
Total loans		959,206
Non-acquired loans | Commercial loans | Construction and land development | Special mention
Loans
Total loans		7,095
Non-acquired loans | Commercial loans | Construction and land development | Substandard
Loans
Total loans		2,059
Non-acquired loans | Commercial loans | Commercial non-owner occupied
Loans
Total loans		1,811,138
Total loans - ASU 2016-13		1,811,138
Non-acquired loans | Commercial loans | Commercial non-owner occupied | Pass
Loans
Total loans		1,787,306
Non-acquired loans | Commercial loans | Commercial non-owner occupied | Special mention
Loans
Total loans		22,410
Non-acquired loans | Commercial loans | Commercial non-owner occupied | Substandard
Loans
Total loans		1,422
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan
Loans
Total loans		1,784,017
Total loans - ASU 2016-13		1,784,017
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan | Pass
Loans
Total loans		1,754,801
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan | Special mention
Loans
Total loans		19,742
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan | Substandard
Loans
Total loans		9,474
Non-acquired loans | Commercial loans | Commercial and industrial
Loans
Total loans		1,280,859
Non-acquired loans | Commercial loans | Commercial and industrial | Pass
Loans
Total loans		1,256,465
Non-acquired loans | Commercial loans | Commercial and industrial | Special mention
Loans
Total loans		16,055
Non-acquired loans | Commercial loans | Commercial and industrial | Substandard
Loans
Total loans		8,339
Non-acquired loans | Commercial loans | Other income producing property
Loans
Total loans		218,617
Non-acquired loans | Commercial loans | Other income producing property | Pass
Loans
Total loans		213,291
Non-acquired loans | Commercial loans | Other income producing property | Special mention
Loans
Total loans		3,966
Non-acquired loans | Commercial loans | Other income producing property | Substandard
Loans
Total loans		1,360
Non-acquired loans | Consumer
Loans
Total loans		3,189,840
Non-acquired loans | Consumer | Pass
Loans
Total loans		3,152,028
Non-acquired loans | Consumer | Special mention
Loans
Total loans		14,562
Non-acquired loans | Consumer | Substandard
Loans
Total loans		23,250
Non-acquired loans | Consumer | Consumer Owner Occupied Loans
Loans
Total loans		2,118,839
Total loans - ASU 2016-13		2,118,839
Non-acquired loans | Consumer | Consumer Owner Occupied Loans | Pass
Loans
Total loans		2,094,080
Non-acquired loans | Consumer | Consumer Owner Occupied Loans | Special mention
Loans
Total loans		9,585
Non-acquired loans | Consumer | Consumer Owner Occupied Loans | Substandard
Loans
Total loans		15,174
Non-acquired loans | Consumer | Home equity loans
Loans
Total loans		518,628
Total loans - ASU 2016-13		518,628
Non-acquired loans | Consumer | Home equity loans | Pass
Loans
Total loans		508,054
Non-acquired loans | Consumer | Home equity loans | Special mention
Loans
Total loans		4,490
Non-acquired loans | Consumer | Home equity loans | Substandard
Loans
Total loans		6,084
Non-acquired loans | Consumer | Consumer
Loans
Total loans		538,481
Total loans - ASU 2016-13		538,481
Non-acquired loans | Consumer | Consumer | Pass
Loans
Total loans		536,002
Non-acquired loans | Consumer | Consumer | Special mention
Loans
Total loans		487
Non-acquired loans | Consumer | Consumer | Substandard
Loans
Total loans		1,992
Non-acquired loans | Consumer | Other loans
Loans
Total loans		13,892
Total loans - ASU 2016-13		13,892
Non-acquired loans | Consumer | Other loans | Pass
Loans
Total loans		$ 13,892

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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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