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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Carrying Amount of Loans by Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable [Abstract]    
Current $ 7,430,261 $ 7,021,750
Financing Receivable, Recorded Investment, Past Due 14,533 14,323
Nonaccrual 54,410 55,312
Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 953 2,300
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 760,747 818,386
Financing Receivable, Recorded Investment, Past Due 1,214 214
Nonaccrual 4,724 6,123
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 1,563,025 1,616,361
Financing Receivable, Recorded Investment, Past Due 9,321 10,061
Nonaccrual 20,107 23,079
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] 717 2,058
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 1,905,246 1,718,151
Financing Receivable, Recorded Investment, Past Due 594 525
Nonaccrual 10,313 17,800
Secured by Nonfarm, Nonresidential 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] 18  
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 315,805 211,083
Financing Receivable, Recorded Investment, Past Due 144  
Nonaccrual 1,731 145
Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Current 1,403,809 1,334,623
Financing Receivable, Recorded Investment, Past Due 1,048 966
Nonaccrual 16,525 7,622
Consumer Loans [Member]    
Financing Receivable [Abstract]    
Current 167,821 166,680
Financing Receivable, Recorded Investment, Past Due 2,063 2,424
Nonaccrual 189 31
Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 218 242
State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Current 875,973 734,550
Financing Receivable, Recorded Investment, Past Due   65
Other Loans [Member]    
Financing Receivable [Abstract]    
Current 437,835 421,916
Financing Receivable, Recorded Investment, Past Due 149 68
Nonaccrual 821 512
Commercial LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 5,799,239 5,336,445
Commercial LHFI [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 5,588,197 5,180,903
Commercial LHFI [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 28,041 24,510
Commercial LHFI [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 180,289 128,883
Commercial LHFI [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,712 2,149
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 705,496 762,393
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Pass [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 687,123 746,227
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 8,494  
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 9,410 15,637
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Doubtful [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 469 529
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 131,562 133,328
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Pass [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 124,472 125,268
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 467 345
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 6,262 7,525
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Doubtful [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 361 190
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,915,394 1,735,723
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Pass [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,870,036 1,680,846
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 3,196 2,031
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 41,668 52,485
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Doubtful [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 494 361
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 316,815 209,865
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Pass [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 314,858 205,097
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,957 4,768
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,421,382 1,343,211
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,304,137 1,295,760
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 9,094 9,473
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 107,405 37,284
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 746 694
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 875,973 734,615
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 858,168 713,616
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 6,450 12,478
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 11,355 8,521
Commercial LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 432,617 417,310
Commercial LHFI [Member] | Other Loans [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 429,403 414,089
Commercial LHFI [Member] | Other Loans [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 340 183
Commercial LHFI [Member] | Other Loans [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,232 2,663
Commercial LHFI [Member] | Other Loans [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 642 375
Consumer LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 7,499,204 7,091,385
Current 1,671,522 1,722,055
Nonaccrual 17,314 20,692
Subtotal 1,699,965 1,754,940
Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 10,194 9,893
Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 935 2,300
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 766,685 824,723
Current 60,546 62,158
Nonaccrual 467 26
Subtotal 61,189 62,330
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 176 146
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,592,453 1,649,501
Current 1,435,347 1,485,914
Nonaccrual 16,654 20,636
Subtotal 1,460,891 1,516,173
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 8,173 7,565
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 717 2,058
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,916,153 1,736,476
Current 759 753
Subtotal 759 753
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 317,680 211,228
Current 865 1,363
Subtotal 865 1,363
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,421,382 1,343,211
Consumer LHFI [Member] | Consumer Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 170,073 169,135
Current 167,817 166,681
Nonaccrual 193 30
Subtotal 170,073 169,135
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 1,845 2,182
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 218 242
Consumer LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 875,973 734,615
Consumer LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 438,805 422,496
Current 6,188 5,186
Subtotal $ 6,188 $ 5,186
[1] Past due 90 days or more but still accruing interest.