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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of LHFI by Loan Type and Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable [Abstract]    
Current $ 8,666,880 $ 8,483,959
Financing Receivable, Recorded Investment, Past Due 12,314 18,433
Nonaccrual 67,836 67,575
Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 726 2,171
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 1,029,021 985,127
Financing Receivable, Recorded Investment, Past Due 208 392
Nonaccrual 2,262 2,105
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 1,778,488 1,645,876
Financing Receivable, Recorded Investment, Past Due 7,377 10,413
Nonaccrual 15,164 19,022
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 447 1,917
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 2,288,364 2,178,640
Financing Receivable, Recorded Investment, Past Due 536 2,575
Nonaccrual 5,389 12,608
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 452,940 517,744
Financing Receivable, Recorded Investment, Past Due 5  
Nonaccrual 742 212
Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Current 1,530,295 1,535,003
Financing Receivable, Recorded Investment, Past Due 1,757 2,004
Nonaccrual 33,870 33,338
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 21 12
Consumer Loans [Member]    
Financing Receivable [Abstract]    
Current 180,502 169,145
Financing Receivable, Recorded Investment, Past Due 1,979 2,638
Nonaccrual 228 135
Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 258 242
State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Current 920,416 952,094
Financing Receivable, Recorded Investment, Past Due   389
Nonaccrual 8,762  
Other Loans [Member]    
Financing Receivable [Abstract]    
Current 486,854 500,330
Financing Receivable, Recorded Investment, Past Due 452 22
Nonaccrual 1,419 155
Commercial LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 6,821,958 6,788,151
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 966,114 926,881
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 129,193 132,563
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,294,226 2,193,745
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 453,064 517,553
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,565,922 1,570,345
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 929,178 952,483
Commercial LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 484,261 494,581
Commercial LHFI [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 6,660,632 6,554,846
Commercial LHFI [Member] | Pass [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 961,316 922,563
Commercial LHFI [Member] | Pass [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 125,998 127,405
Commercial LHFI [Member] | Pass [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,259,388 2,135,749
Commercial LHFI [Member] | Pass [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 452,095 517,036
Commercial LHFI [Member] | Pass [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,490,431 1,437,590
Commercial LHFI [Member] | Pass [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 913,286 936,420
Commercial LHFI [Member] | Pass [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 458,118 478,083
Commercial LHFI [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 34,327 41,764
Commercial LHFI [Member] | Special Mention [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 78 316
Commercial LHFI [Member] | Special Mention [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 175 134
Commercial LHFI [Member] | Special Mention [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 3,052 6,684
Commercial LHFI [Member] | Special Mention [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 454  
Commercial LHFI [Member] | Special Mention [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 9,721 28,780
Commercial LHFI [Member] | Special Mention [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 5,250 5,850
Commercial LHFI [Member] | Special Mention [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 15,597  
Commercial LHFI [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 124,336 189,722
Commercial LHFI [Member] | Substandard [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 4,512 3,780
Commercial LHFI [Member] | Substandard [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,960 4,948
Commercial LHFI [Member] | Substandard [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 31,302 50,785
Commercial LHFI [Member] | Substandard [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 515 517
Commercial LHFI [Member] | Substandard [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 63,936 103,089
Commercial LHFI [Member] | Substandard [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 10,642 10,213
Commercial LHFI [Member] | Substandard [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 10,469 16,390
Commercial LHFI [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,663 1,819
Commercial LHFI [Member] | Doubtful [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 208 222
Commercial LHFI [Member] | Doubtful [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 60 76
Commercial LHFI [Member] | Doubtful [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 484 527
Commercial LHFI [Member] | Doubtful [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,834 886
Commercial LHFI [Member] | Doubtful [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 77 108
Consumer LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 8,747,030 8,569,967
Current 1,901,700 1,752,484
Nonaccrual 14,377 16,669
Subtotal 1,925,072 1,781,816
Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 8,290 10,612
Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 705 2,051
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,031,491 987,624
Current 65,028 60,240
Nonaccrual 346 161
Subtotal 65,377 60,743
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 3 342
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,801,029 1,675,311
Current 1,651,019 1,516,691
Nonaccrual 13,804 16,374
Subtotal 1,671,836 1,542,748
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 6,566 7,874
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 447 1,809
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,294,289 2,193,823
Current 63 78
Subtotal 63 78
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 453,687 517,956
Current 623 403
Subtotal 623 403
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,565,922 1,570,345
Consumer LHFI [Member] | Consumer Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 182,709 171,918
Current 180,503 169,146
Nonaccrual 227 134
Subtotal 182,709 171,918
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 1,721 2,396
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 258 242
Consumer LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 929,178 952,483
Consumer LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 488,725 500,507
Current 4,464 5,926
Subtotal $ 4,464 $ 5,926
[1] Past due 90 days or more but still accruing interest.