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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
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable [Abstract]    
Current $ 7,930,457 $ 7,787,295
Financing Receivable, Recorded Investment, Past Due 12,893 14,684
Nonaccrual 61,307 49,234
Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 1,307 1,831
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 856,315 827,775
Financing Receivable, Recorded Investment, Past Due 756 339
Nonaccrual 2,856 3,323
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 217 54
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 1,628,136 1,630,536
Financing Receivable, Recorded Investment, Past Due 8,164 9,178
Nonaccrual 20,537 20,329
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] 612 1,436
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 2,052,020 2,024,988
Financing Receivable, Recorded Investment, Past Due 840 706
Nonaccrual 11,492 8,482
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 399,156 317,567
Financing Receivable, Recorded Investment, Past Due 289 179
Nonaccrual 191 402
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 228  
Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Current 1,514,497 1,511,826
Financing Receivable, Recorded Investment, Past Due 876 784
Nonaccrual 25,410 15,824
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 12  
Consumer Loans [Member]    
Financing Receivable [Abstract]    
Current 164,062 168,030
Financing Receivable, Recorded Investment, Past Due 1,927 2,232
Nonaccrual 325 300
Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 238 341
State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Current 910,493 916,480
Financing Receivable, Recorded Investment, Past Due   1,035
Other Loans [Member]    
Financing Receivable [Abstract]    
Current 405,778 390,093
Financing Receivable, Recorded Investment, Past Due 41 231
Nonaccrual 496 574
Commercial LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 6,250,002 6,084,312
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 797,175 770,436
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 136,781 131,076
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,063,654 2,033,445
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 399,016 317,481
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,540,783 1,528,434
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 910,493 917,515
Commercial LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 402,100 385,925
Commercial LHFI [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 6,002,777 5,851,296
Commercial LHFI [Member] | Pass [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 790,145 752,318
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 129,742 124,615
Commercial LHFI [Member] | Pass [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,012,125 1,989,554
Commercial LHFI [Member] | Pass [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 388,398 315,829
Commercial LHFI [Member] | Pass [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,390,084 1,386,155
Commercial LHFI [Member] | Pass [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 893,139 899,935
Commercial LHFI [Member] | Pass [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 399,144 382,890
Commercial LHFI [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 44,586 28,438
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   9,567
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 219 170
Commercial LHFI [Member] | Special Mention [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 9,172 4,394
Commercial LHFI [Member] | Special Mention [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 9,938 762
Commercial LHFI [Member] | Special Mention [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 18,807 7,095
Commercial LHFI [Member] | Special Mention [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 6,450 6,450
Commercial LHFI [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 199,773 202,065
Commercial LHFI [Member] | Substandard [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 6,567 8,086
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 6,610 6,162
Commercial LHFI [Member] | Substandard [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 41,597 38,913
Commercial LHFI [Member] | Substandard [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 680 890
Commercial LHFI [Member] | Substandard [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 130,806 134,199
Commercial LHFI [Member] | Substandard [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 10,904 11,130
Commercial LHFI [Member] | Substandard [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,609 2,685
Commercial LHFI [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,866 2,513
Commercial LHFI [Member] | Doubtful [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 463 465
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 210 129
Commercial LHFI [Member] | Doubtful [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 760 584
Commercial LHFI [Member] | Doubtful [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,086 985
Commercial LHFI [Member] | Doubtful [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 347 350
Consumer LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 8,004,657 7,851,213
Current 1,727,380 1,738,166
Nonaccrual 17,612 17,415
Subtotal 1,754,655 1,766,901
Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 8,813 9,489
Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 850 1,831
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 859,927 831,437
Current 62,185 60,701
Nonaccrual 121 58
Subtotal 62,752 61,001
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 446 188
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due   54
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,656,837 1,660,043
Current 1,495,639 1,503,096
Nonaccrual 17,167 17,058
Subtotal 1,520,056 1,528,967
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 6,638 7,377
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 612 1,436
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,064,352 2,034,176
Current 698 731
Subtotal 698 731
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 399,636 318,148
Current 620 667
Subtotal 620 667
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,540,783 1,528,434
Consumer LHFI [Member] | Consumer Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 166,314 170,562
Current 164,063 168,031
Nonaccrual 324 299
Subtotal 166,314 170,562
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 1,689 1,891
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 238 341
Consumer LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 910,493 917,515
Consumer LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 406,315 390,898
Current 4,175 4,940
Subtotal 4,215 4,973
Consumer LHFI [Member] | Other Loans [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due $ 40 $ 33
[1] Past due 90 days or more but still accruing interest.