Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of Amortized Cost Basis of Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		$ 2,052,251
Term Loans by Origination Year, 2019		2,084,709
Term Loans by Origination Year, 2018		1,436,719
Term Loans by Origination Year, 2017		812,979
Term Loans by Origination Year, 2016		839,983
Term Loans by Origination Year, Prior to 2016		1,316,681
Financing Receivable, Revolving Loans		1,304,406
Total LHFI	[1]	9,847,728	$ 9,335,628
Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI		1,398,468	1,477,896
State and Other Political Subdivision Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI		935,349	967,944
Other Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	[2]	593,212	495,621
Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI		163,933	175,738
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI		494,519	1,162,791
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	[2]	547,148	1,855,913
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI		887,792	724,480
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI		2,707,627	2,475,245
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	[2]	891,428
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	[2]	1,228,252
Commercial LHFI [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		1,726,782
Term Loans by Origination Year, 2019		1,777,274
Term Loans by Origination Year, 2018		1,200,711
Term Loans by Origination Year, 2017		697,011
Term Loans by Origination Year, 2016		713,192
Term Loans by Origination Year, Prior to 2016		936,064
Financing Receivable, Revolving Loans		887,976
Total LHFI		7,939,010	7,348,158
Commercial LHFI [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI			7,178,617
Commercial LHFI [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI			9,049
Commercial LHFI [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI			159,163
Commercial LHFI [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI			1,329
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		440,617
Term Loans by Origination Year, 2019		186,648
Term Loans by Origination Year, 2018		120,343
Term Loans by Origination Year, 2017		87,668
Term Loans by Origination Year, 2016		76,725
Term Loans by Origination Year, Prior to 2016		55,312
Financing Receivable, Revolving Loans		431,155
Total LHFI		1,398,468	1,477,896
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		433,771
Term Loans by Origination Year, 2019		184,698
Term Loans by Origination Year, 2018		104,647
Term Loans by Origination Year, 2017		83,887
Term Loans by Origination Year, 2016		74,401
Term Loans by Origination Year, Prior to 2016		49,508
Financing Receivable, Revolving Loans		394,527
Total LHFI		1,325,439	1,407,837
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		844
Term Loans by Origination Year, 2018		177
Financing Receivable, Revolving Loans		3,000
Total LHFI		4,021	909
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		5,824
Term Loans by Origination Year, 2019		1,731
Term Loans by Origination Year, 2018		15,519
Term Loans by Origination Year, 2017		3,781
Term Loans by Origination Year, 2016		2,286
Term Loans by Origination Year, Prior to 2016		5,800
Financing Receivable, Revolving Loans		33,604
Total LHFI		68,545	68,262
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		178
Term Loans by Origination Year, 2019		219
Term Loans by Origination Year, 2016		38
Term Loans by Origination Year, Prior to 2016		4
Financing Receivable, Revolving Loans		24
Total LHFI		463	888
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		141,729
Term Loans by Origination Year, 2019		84,369
Term Loans by Origination Year, 2018		51,181
Term Loans by Origination Year, 2017		116,822
Term Loans by Origination Year, 2016		135,190
Term Loans by Origination Year, Prior to 2016		405,226
Financing Receivable, Revolving Loans		832
Total LHFI		935,349	967,944
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		141,729
Term Loans by Origination Year, 2019		84,369
Term Loans by Origination Year, 2018		51,181
Term Loans by Origination Year, 2017		116,529
Term Loans by Origination Year, 2016		135,190
Term Loans by Origination Year, Prior to 2016		396,607
Financing Receivable, Revolving Loans		832
Total LHFI		926,437	957,948
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Prior to 2016		4,000
Total LHFI		4,000	4,650
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2017		293
Term Loans by Origination Year, Prior to 2016		4,619
Total LHFI		4,912	5,346
Commercial LHFI [Member] | Other Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		82,583
Term Loans by Origination Year, 2019		79,084
Term Loans by Origination Year, 2018		24,177
Term Loans by Origination Year, 2017		11,708
Term Loans by Origination Year, 2016		57,423
Term Loans by Origination Year, Prior to 2016		51,748
Financing Receivable, Revolving Loans		286,489
Total LHFI		593,212
Commercial LHFI [Member] | Other Commercial Loans [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		74,539
Term Loans by Origination Year, 2019		76,935
Term Loans by Origination Year, 2018		23,491
Term Loans by Origination Year, 2017		11,708
Term Loans by Origination Year, 2016		56,530
Term Loans by Origination Year, Prior to 2016		51,725
Financing Receivable, Revolving Loans		265,683
Total LHFI		560,611
Commercial LHFI [Member] | Other Commercial Loans [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		7,917
Financing Receivable, Revolving Loans		11,333
Total LHFI		19,250
Commercial LHFI [Member] | Other Commercial Loans [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		127
Term Loans by Origination Year, 2019		2,146
Term Loans by Origination Year, 2018		686
Term Loans by Origination Year, 2016		893
Financing Receivable, Revolving Loans		9,473
Total LHFI		13,325
Commercial LHFI [Member] | Other Commercial Loans [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2019		3
Term Loans by Origination Year, Prior to 2016		23
Total LHFI		26
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		233,211
Term Loans by Origination Year, 2019		100,766
Term Loans by Origination Year, 2018		34,635
Term Loans by Origination Year, 2017		4,743
Term Loans by Origination Year, 2016		4,104
Term Loans by Origination Year, Prior to 2016		4,401
Financing Receivable, Revolving Loans		29,238
Total LHFI		411,098
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		226,639
Term Loans by Origination Year, 2019		96,572
Term Loans by Origination Year, 2018		33,263
Term Loans by Origination Year, 2017		4,709
Term Loans by Origination Year, 2016		3,424
Term Loans by Origination Year, Prior to 2016		4,336
Financing Receivable, Revolving Loans		29,238
Total LHFI		398,181
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		268
Total LHFI		268
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		6,304
Term Loans by Origination Year, 2019		4,194
Term Loans by Origination Year, 2018		1,372
Term Loans by Origination Year, 2017		34
Term Loans by Origination Year, 2016		680
Term Loans by Origination Year, Prior to 2016		23
Total LHFI		12,607
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Prior to 2016		42
Total LHFI		42
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		29,515
Term Loans by Origination Year, 2019		23,147
Term Loans by Origination Year, 2018		19,821
Term Loans by Origination Year, 2017		10,969
Term Loans by Origination Year, 2016		12,174
Term Loans by Origination Year, Prior to 2016		7,223
Financing Receivable, Revolving Loans		12,438
Total LHFI		115,287
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		28,504
Term Loans by Origination Year, 2019		23,022
Term Loans by Origination Year, 2018		18,840
Term Loans by Origination Year, 2017		10,616
Term Loans by Origination Year, 2016		11,869
Term Loans by Origination Year, Prior to 2016		6,610
Financing Receivable, Revolving Loans		8,288
Total LHFI		107,749
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		46
Term Loans by Origination Year, 2019		43
Total LHFI		89
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		934
Term Loans by Origination Year, 2019		82
Term Loans by Origination Year, 2018		981
Term Loans by Origination Year, 2017		353
Term Loans by Origination Year, 2016		305
Term Loans by Origination Year, Prior to 2016		613
Financing Receivable, Revolving Loans		4,150
Total LHFI		7,418
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		31
Total LHFI		31
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		119,064
Term Loans by Origination Year, 2019		206,361
Term Loans by Origination Year, 2018		303,663
Term Loans by Origination Year, 2017		107,141
Term Loans by Origination Year, 2016		110,649
Term Loans by Origination Year, Prior to 2016		29,041
Financing Receivable, Revolving Loans		11,336
Total LHFI		887,255
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		107,988
Term Loans by Origination Year, 2019		206,213
Term Loans by Origination Year, 2018		303,645
Term Loans by Origination Year, 2017		107,141
Term Loans by Origination Year, 2016		110,083
Term Loans by Origination Year, Prior to 2016		27,682
Financing Receivable, Revolving Loans		11,336
Total LHFI		874,088
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Prior to 2016		858
Total LHFI		858
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		11,076
Term Loans by Origination Year, 2019		148
Term Loans by Origination Year, 2018		18
Term Loans by Origination Year, 2016		566
Term Loans by Origination Year, Prior to 2016		501
Total LHFI		12,309
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		565,751
Term Loans by Origination Year, 2019		532,806
Term Loans by Origination Year, 2018		452,879
Term Loans by Origination Year, 2017		344,614
Term Loans by Origination Year, 2016		315,322
Term Loans by Origination Year, Prior to 2016		383,113
Financing Receivable, Revolving Loans		112,428
Total LHFI		2,706,913	2,475,090
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		545,273
Term Loans by Origination Year, 2019		503,516
Term Loans by Origination Year, 2018		435,877
Term Loans by Origination Year, 2017		326,971
Term Loans by Origination Year, 2016		274,113
Term Loans by Origination Year, Prior to 2016		333,242
Financing Receivable, Revolving Loans		110,298
Total LHFI		2,529,290	2,430,761
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		6,330
Term Loans by Origination Year, 2019		6,916
Term Loans by Origination Year, 2018		13,487
Term Loans by Origination Year, 2017		4,551
Term Loans by Origination Year, 2016		5,053
Term Loans by Origination Year, Prior to 2016		15,227
Total LHFI		51,564
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		14,093
Term Loans by Origination Year, 2019		22,207
Term Loans by Origination Year, 2018		3,515
Term Loans by Origination Year, 2017		13,092
Term Loans by Origination Year, 2016		35,939
Term Loans by Origination Year, Prior to 2016		34,326
Financing Receivable, Revolving Loans		2,130
Total LHFI		125,302	44,001
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		55
Term Loans by Origination Year, 2019		167
Term Loans by Origination Year, 2016		217
Term Loans by Origination Year, Prior to 2016		318
Total LHFI		757	328
Commercial LHFI [Member] | Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		114,312
Term Loans by Origination Year, 2019		564,093
Term Loans by Origination Year, 2018		194,012
Term Loans by Origination Year, 2017		13,346
Term Loans by Origination Year, 2016		1,605
Financing Receivable, Revolving Loans		4,060
Total LHFI		891,428
Commercial LHFI [Member] | Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		113,727
Term Loans by Origination Year, 2019		564,093
Term Loans by Origination Year, 2018		194,012
Term Loans by Origination Year, 2017		13,346
Term Loans by Origination Year, 2016		1,605
Financing Receivable, Revolving Loans		4,060
Total LHFI		890,843
Commercial LHFI [Member] | Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		585
Total LHFI		585
Consumer LHFI [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		325,469
Term Loans by Origination Year, 2019		307,435
Term Loans by Origination Year, 2018		236,008
Term Loans by Origination Year, 2017		115,968
Term Loans by Origination Year, 2016		126,791
Term Loans by Origination Year, Prior to 2016		380,617
Financing Receivable, Revolving Loans		416,430
Total LHFI		1,908,718	9,335,628
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI			1,477,896
Consumer LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI			967,944
Consumer LHFI [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		54,616
Term Loans by Origination Year, 2019		32,245
Term Loans by Origination Year, 2018		16,919
Term Loans by Origination Year, 2017		5,140
Term Loans by Origination Year, 2016		1,638
Term Loans by Origination Year, Prior to 2016		622
Financing Receivable, Revolving Loans		52,753
Total LHFI		163,933	175,738
Consumer LHFI [Member] | Consumer Loans [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		54,252
Term Loans by Origination Year, 2019		32,198
Term Loans by Origination Year, 2018		16,771
Term Loans by Origination Year, 2017		4,956
Term Loans by Origination Year, 2016		1,625
Term Loans by Origination Year, Prior to 2016		617
Financing Receivable, Revolving Loans		52,170
Total LHFI		162,589
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		329
Term Loans by Origination Year, 2019		40
Term Loans by Origination Year, 2018		70
Term Loans by Origination Year, 2017		168
Term Loans by Origination Year, 2016		10
Term Loans by Origination Year, Prior to 2016		5
Financing Receivable, Revolving Loans		503
Total LHFI		1,125
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		24
Term Loans by Origination Year, 2019		1
Term Loans by Origination Year, 2018		19
Financing Receivable, Revolving Loans		79
Total LHFI		123
Consumer LHFI [Member] | Consumer Loans [Member] | Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		11
Term Loans by Origination Year, 2019		6
Term Loans by Origination Year, 2018		59
Term Loans by Origination Year, 2017		16
Term Loans by Origination Year, 2016		3
Financing Receivable, Revolving Loans		1
Total LHFI		96
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		32,812
Term Loans by Origination Year, 2019		34,108
Term Loans by Origination Year, 2018		8,999
Term Loans by Origination Year, 2017		2,382
Term Loans by Origination Year, 2016		1,595
Term Loans by Origination Year, Prior to 2016		3,525
Total LHFI		83,421
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		32,812
Term Loans by Origination Year, 2019		34,108
Term Loans by Origination Year, 2018		8,758
Term Loans by Origination Year, 2017		2,382
Term Loans by Origination Year, 2016		1,576
Term Loans by Origination Year, Prior to 2016		3,347
Total LHFI		82,983
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Past Due 30-89 Days [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2018		241
Term Loans by Origination Year, Prior to 2016		74
Total LHFI		315
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2016		19
Term Loans by Origination Year, Prior to 2016		104
Total LHFI		123
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		18,843
Term Loans by Origination Year, 2019		14,113
Term Loans by Origination Year, 2018		13,334
Term Loans by Origination Year, 2017		4,746
Term Loans by Origination Year, 2016		2,200
Term Loans by Origination Year, Prior to 2016		14,948
Financing Receivable, Revolving Loans		363,677
Total LHFI		431,861
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		18,709
Term Loans by Origination Year, 2019		13,768
Term Loans by Origination Year, 2018		13,212
Term Loans by Origination Year, 2017		4,295
Term Loans by Origination Year, 2016		2,142
Term Loans by Origination Year, Prior to 2016		14,300
Financing Receivable, Revolving Loans		360,724
Total LHFI		427,150
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Past Due 30-89 Days [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		126
Term Loans by Origination Year, 2019		297
Term Loans by Origination Year, 2017		15
Term Loans by Origination Year, 2016		58
Term Loans by Origination Year, Prior to 2016		186
Financing Receivable, Revolving Loans		538
Total LHFI		1,220
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2019		15
Term Loans by Origination Year, 2018		12
Financing Receivable, Revolving Loans		272
Total LHFI		299
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		8
Term Loans by Origination Year, 2019		33
Term Loans by Origination Year, 2018		110
Term Loans by Origination Year, 2017		436
Term Loans by Origination Year, Prior to 2016		462
Financing Receivable, Revolving Loans		2,143
Total LHFI		3,192
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		139
Term Loans by Origination Year, 2018		41
Term Loans by Origination Year, 2017		38
Term Loans by Origination Year, 2016		102
Term Loans by Origination Year, Prior to 2016		217
Total LHFI		537
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		139
Term Loans by Origination Year, 2018		41
Term Loans by Origination Year, 2017		38
Term Loans by Origination Year, 2016		102
Term Loans by Origination Year, Prior to 2016		217
Total LHFI		537
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		698
Term Loans by Origination Year, 2017		4
Term Loans by Origination Year, Prior to 2016		12
Total LHFI		714	$ 2,475,245
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		698
Term Loans by Origination Year, 2017		4
Term Loans by Origination Year, Prior to 2016		12
Total LHFI		714
Consumer LHFI [Member] | Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		218,361
Term Loans by Origination Year, 2019		226,969
Term Loans by Origination Year, 2018		196,715
Term Loans by Origination Year, 2017		103,658
Term Loans by Origination Year, 2016		121,256
Term Loans by Origination Year, Prior to 2016		361,293
Total LHFI		1,228,252
Consumer LHFI [Member] | Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		217,950
Term Loans by Origination Year, 2019		226,130
Term Loans by Origination Year, 2018		194,593
Term Loans by Origination Year, 2017		102,945
Term Loans by Origination Year, 2016		119,707
Term Loans by Origination Year, Prior to 2016		352,569
Total LHFI		1,213,894
Consumer LHFI [Member] | Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Past Due 30-89 Days [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		256
Term Loans by Origination Year, 2018		71
Term Loans by Origination Year, 2017		274
Term Loans by Origination Year, 2016		1,127
Term Loans by Origination Year, Prior to 2016		1,180
Total LHFI		2,908
Consumer LHFI [Member] | Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		7
Term Loans by Origination Year, 2016		181
Term Loans by Origination Year, Prior to 2016		171
Total LHFI		359
Consumer LHFI [Member] | Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020		148
Term Loans by Origination Year, 2019		839
Term Loans by Origination Year, 2018		2,051
Term Loans by Origination Year, 2017		439
Term Loans by Origination Year, 2016		241
Term Loans by Origination Year, Prior to 2016		7,373
Total LHFI		$ 11,091

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

[2] In accordance with the guidance in FASB ASC Topic 326, Trustmark redefined its LHFI portfolio segments and related loan classes based on the level at which risk is monitored within the ACL methodology. The other loans secured by real estate portfolio segment and related loan classes were separated from the loans secured by real estate portfolio segment. The other construction loans were segregated from the construction, land development and other land loans. The other loans secured by 1-4 family residential properties were segregated from the loans secured by 1-4 family residential properties and the loans secured by 1-4 family residential properties were redefined in the other loans secured by real estate portfolio segment. Other loans were redefined as other commercial loans.