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LHFI and Allowance for Loan Losses, LHFI - Carrying Amount of Loans by Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable [Abstract]    
Current $ 7,184,434 $ 7,021,750
Financing Receivable, Recorded Investment, Past Due 12,894 14,323
Nonaccrual 70,694 55,312
Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 611 2,300
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 690,802 818,386
Financing Receivable, Recorded Investment, Past Due 390 214
Nonaccrual 6,308 6,123
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] 54  
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 1,608,332 1,616,361
Financing Receivable, Recorded Investment, Past Due 8,023 10,061
Nonaccrual 23,660 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] 403 2,058
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 1,870,936 1,718,151
Financing Receivable, Recorded Investment, Past Due 163 525
Nonaccrual 22,141 17,800
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 272,953 211,083
Financing Receivable, Recorded Investment, Past Due 706  
Nonaccrual 93 145
Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Current 1,348,949 1,334,623
Financing Receivable, Recorded Investment, Past Due 1,688 966
Nonaccrual 17,827 7,622
Consumer Loans [Member]    
Financing Receivable [Abstract]    
Current 162,972 166,680
Financing Receivable, Recorded Investment, Past Due 1,486 2,424
Nonaccrual 86 31
Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 154 242
State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Current 787,049 734,550
Financing Receivable, Recorded Investment, Past Due   65
Other Loans [Member]    
Financing Receivable [Abstract]    
Current 442,441 421,916
Financing Receivable, Recorded Investment, Past Due 438 68
Nonaccrual 579 512
Commercial LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 5,520,430 5,336,445
Commercial LHFI [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 5,359,463 5,180,903
Commercial LHFI [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 9,849 24,510
Commercial LHFI [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 148,345 128,883
Commercial LHFI [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,773 2,149
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 632,299 762,393
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Pass [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 617,582 746,227
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 14,191 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 526 529
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 128,639 133,328
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 119,537 125,268
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 552 345
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 8,194 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 356 190
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,892,367 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 1,832,682 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 1,487 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 57,525 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 673 361
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 272,736 209,865
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Pass [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 271,453 205,097
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,283 4,768
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,368,464 1,343,211
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,312,644 1,295,760
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 810 9,473
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 54,237 37,284
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 773 694
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 787,048 734,615
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 769,592 713,616
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 7,000 12,478
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 10,456 8,521
Commercial LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 438,877 417,310
Commercial LHFI [Member] | Other Loans [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 435,973 414,089
Commercial LHFI [Member] | Other Loans [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial   183
Commercial LHFI [Member] | Other Loans [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,459 2,663
Commercial LHFI [Member] | Other Loans [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 445 375
Consumer LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 7,268,022 7,091,385
Current 1,716,915 1,722,055
Nonaccrual 21,948 20,692
Subtotal 1,747,592 1,754,940
Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 8,118 9,893
Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 611 2,300
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 697,500 824,723
Current 64,411 62,158
Nonaccrual 485 26
Subtotal 65,201 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 251 146
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 1,640,015 1,649,501
Current 1,483,060 1,485,914
Nonaccrual 21,378 20,636
Subtotal 1,511,376 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 6,535 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 403 2,058
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,893,240 1,736,476
Current 873 753
Subtotal 873 753
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 273,752 211,228
Current 1,016 1,363
Subtotal 1,016 1,363
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,368,464 1,343,211
Consumer LHFI [Member] | Consumer Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 164,544 169,135
Current 162,973 166,681
Nonaccrual 85 30
Subtotal 164,544 169,135
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 1,332 2,182
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 154 242
Consumer LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 787,049 734,615
Current 1  
Subtotal 1  
Consumer LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 443,458 422,496
Current 4,581 5,186
Subtotal $ 4,581 $ 5,186
[1] Past due 90 days or more but still accruing interest.