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LHFI and Allowance for Loan Losses, LHFI - Carrying Amount of Loans by Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable [Abstract]    
Current $ 7,787,295 $ 7,021,750
Financing Receivable, Recorded Investment, Past Due 14,684 14,323
Nonaccrual 49,234 55,312
Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 1,831 2,300
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 1,630,536 1,616,361
Financing Receivable, Recorded Investment, Past Due 9,178 10,061
Nonaccrual 20,329 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] 1,436 2,058
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 2,024,988 1,718,151
Financing Receivable, Recorded Investment, Past Due 706 525
Nonaccrual 8,482 17,800
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 317,567 211,083
Financing Receivable, Recorded Investment, Past Due 179  
Nonaccrual 402 145
Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Current 1,511,826 1,334,623
Financing Receivable, Recorded Investment, Past Due 784 966
Nonaccrual 15,824 7,622
Consumer Loans [Member]    
Financing Receivable [Abstract]    
Current 168,030 166,680
Financing Receivable, Recorded Investment, Past Due 2,232 2,424
Nonaccrual 300 31
Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 341 242
State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Current 916,480 734,550
Financing Receivable, Recorded Investment, Past Due 1,035 65
Other Loans [Member]    
Financing Receivable [Abstract]    
Current 390,093 421,916
Financing Receivable, Recorded Investment, Past Due 231 68
Nonaccrual 574 512
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Current 827,775 818,386
Financing Receivable, Recorded Investment, Past Due 339 214
Nonaccrual 3,323 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  
Commercial LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 6,084,312 5,336,445
Commercial LHFI [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 5,851,296 5,180,903
Commercial LHFI [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 28,438 24,510
Commercial LHFI [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 202,065 128,883
Commercial LHFI [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,513 2,149
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 131,076 133,328
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 124,615 125,268
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 170 345
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 6,162 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 129 190
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,033,445 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 1,989,554 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 4,394 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 38,913 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 584 361
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 317,481 209,865
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Pass [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 315,829 205,097
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 762  
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 890 4,768
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,528,434 1,343,211
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,386,155 1,295,760
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 7,095 9,473
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 134,199 37,284
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 985 694
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 917,515 734,615
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 899,935 713,616
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 11,130 8,521
Commercial LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 385,925 417,310
Commercial LHFI [Member] | Other Loans [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 382,890 414,089
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 2,685 2,663
Commercial LHFI [Member] | Other Loans [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 350 375
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 770,436 762,393
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Pass [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 752,318 746,227
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 9,567  
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 8,086 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 465 529
Consumer LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 7,851,213 7,091,385
Current 1,738,166 1,722,055
Nonaccrual 17,415 20,692
Subtotal 1,766,901 1,754,940
Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 9,489 9,893
Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 1,831 2,300
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,660,043 1,649,501
Current 1,503,096 1,485,914
Nonaccrual 17,058 20,636
Subtotal 1,528,967 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 7,377 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 1,436 2,058
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 2,034,176 1,736,476
Current 731 753
Subtotal 731 753
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 318,148 211,228
Current 667 1,363
Subtotal 667 1,363
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,528,434 1,343,211
Consumer LHFI [Member] | Consumer Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 170,562 169,135
Current 168,031 166,681
Nonaccrual 299 30
Subtotal 170,562 169,135
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 1,891 2,182
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 341 242
Consumer LHFI [Member] | State and Other Political Subdivision Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 917,515 734,615
Consumer LHFI [Member] | Other Loans [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 390,898 422,496
Current 4,940 5,186
Subtotal 4,973 5,186
Consumer LHFI [Member] | Other Loans [Member] | Past Due 30-89 Days [Member]    
Financing Receivable [Abstract]    
Financing Receivable, Recorded Investment, Past Due 33  
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 831,437 824,723
Current 60,701 62,158
Nonaccrual 58 26
Subtotal 61,001 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 188 $ 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  
[1] Past due 90 days or more but still accruing interest.