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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, 2019
Dec. 31, 2018
Financing Receivable [Abstract]    
Current $ 9,153,311 $ 8,756,553
Financing Receivable, Recorded Investment, Past Due 11,327 17,691
Nonaccrual 59,030 61,624
Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 878 856
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 1,134,576 1,054,099
Financing Receivable, Recorded Investment, Past Due 279 284
Nonaccrual 1,144 2,218
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 1,796,674 1,799,905
Financing Receivable, Recorded Investment, Past Due 5,183 10,869
Nonaccrual 18,598 14,718
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] 540 569
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 2,432,333 2,209,406
Financing Receivable, Recorded Investment, Past Due 2,218 1,887
Nonaccrual 7,757 9,621
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 667,423 542,597
Financing Receivable, Recorded Investment, Past Due 177 296
Nonaccrual 1,067 927
Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Current 1,464,860 1,513,131
Financing Receivable, Recorded Investment, Past Due 1,194 1,646
Nonaccrual 25,313 23,938
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 40  
Consumer Loans [Member]    
Financing Receivable [Abstract]    
Current 174,705 179,803
Financing Receivable, Recorded Investment, Past Due 2,079 2,440
Nonaccrual 110 205
Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 298 287
State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Current 974,378 965,037
Financing Receivable, Recorded Investment, Past Due   186
Nonaccrual 4,078 8,595
Other Loans [Member]    
Financing Receivable [Abstract]    
Current 508,362 492,575
Financing Receivable, Recorded Investment, Past Due 197 83
Nonaccrual 963 1,402
Commercial LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 7,261,370 6,879,655
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,056,889 988,228
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 119,005 126,367
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,442,277 2,220,854
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 667,928 542,891
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,491,342 1,538,715
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 978,456 973,818
Commercial LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 505,473 488,782
Commercial LHFI [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 7,102,026 6,712,604
Commercial LHFI [Member] | Pass [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,052,274 982,305
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 115,855 123,191
Commercial LHFI [Member] | Pass [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,397,641 2,182,106
Commercial LHFI [Member] | Pass [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 666,967 537,958
Commercial LHFI [Member] | Pass [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,416,225 1,468,262
Commercial LHFI [Member] | Pass [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 968,335 958,214
Commercial LHFI [Member] | Pass [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 484,729 460,568
Commercial LHFI [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 9,119 37,387
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 67 75
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 45 216
Commercial LHFI [Member] | Special Mention [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial   1,250
Commercial LHFI [Member] | Special Mention [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial   323
Commercial LHFI [Member] | Special Mention [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 948 12,431
Commercial LHFI [Member] | Special Mention [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 4,650 5,250
Commercial LHFI [Member] | Special Mention [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 3,409 17,842
Commercial LHFI [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 148,944 126,631
Commercial LHFI [Member] | Substandard [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 4,361 5,645
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 3,061 2,731
Commercial LHFI [Member] | Substandard [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 44,290 37,025
Commercial LHFI [Member] | Substandard [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 961 4,610
Commercial LHFI [Member] | Substandard [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 73,498 55,943
Commercial LHFI [Member] | Substandard [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 5,471 10,354
Commercial LHFI [Member] | Substandard [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 17,302 10,323
Commercial LHFI [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,281 3,033
Commercial LHFI [Member] | Doubtful [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 187 203
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 44 229
Commercial LHFI [Member] | Doubtful [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 346 473
Commercial LHFI [Member] | Doubtful [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 671 2,079
Commercial LHFI [Member] | Doubtful [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 33 49
Consumer LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 9,223,668 8,835,868
Current 1,937,866 1,929,437
Nonaccrual 17,221 13,770
Subtotal 1,962,298 1,956,213
Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 6,374 12,149
Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 837 857
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,135,999 1,056,601
Current 78,814 67,913
Nonaccrual 226 336
Subtotal 79,110 68,373
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 70 124
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,820,455 1,825,492
Current 1,679,502 1,675,455
Nonaccrual 16,886 13,229
Subtotal 1,701,450 1,699,125
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 4,523 9,872
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 539 569
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,442,308 2,220,914
Current 31 60
Subtotal 31 60
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 668,667 543,820
Current 739 929
Subtotal 739 929
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,491,367 1,538,715
Current 25  
Subtotal 25  
Consumer LHFI [Member] | Consumer Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 176,894 182,448
Current 174,706 179,802
Nonaccrual 109 205
Subtotal 176,894 182,448
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 1,781 2,153
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 298 288
Consumer LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 978,456 973,818
Consumer LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 509,522 494,060
Current 4,049 5,278
Subtotal $ 4,049 $ 5,278
[1] Past due 90 days or more but still accruing interest.