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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (4) (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
USD ($)
KeyRatio
CreditRiskGrade
LoanPool
Dec. 31, 2014
USD ($)
Financing Receivable Aging [Abstract]    
Current $ 6,360,604 $ 6,349,071
Financing Receivable, Recorded Investment, Past Due 18,031 21,055
Nonaccrual 68,438 79,343
Total LHFI $ 6,447,073 6,449,469
Number of days used as baseline in evaluating collateral documentation exceptions for loan policy 90 days  
Number of key quality ratios | KeyRatio 6  
Number of individual credit risk grades | CreditRiskGrade 10  
Number of primary commercial loan groups | LoanPool 9  
Minimum [Member]    
Financing Receivable Aging [Abstract]    
Credit amount used as baseline in evaluating non-owner occupied commercial real estate for loan policy $ 1,000  
Loan amount used as baseline in credit quality review for loan policy $ 100  
Period to conduct asset review 6 months  
Maximum [Member]    
Financing Receivable Aging [Abstract]    
Period to conduct asset review 18 months  
Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] $ 1,771 2,764
Commercial LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 4,704,717 4,708,378
Commercial LHFI [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 4,529,605 4,519,970
Commercial LHFI [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 19,741 22,663
Commercial LHFI [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 153,415 164,053
Commercial LHFI [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,956 1,692
Consumer LHFI [Member]    
Financing Receivable Aging [Abstract]    
Current 1,706,961 1,703,795
Nonaccrual 21,250 21,863
Subtotal 1,742,356 1,741,091
Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 12,374 12,795
Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 1,771 2,638
Construction, Land Development And Other Land Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Aging [Abstract]    
Current 670,865 605,685
Financing Receivable, Recorded Investment, Past Due 691 325
Nonaccrual 10,888 13,867
Total LHFI 682,444 619,877
Construction, Land Development And Other Land Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 0 60
Construction, Land Development And Other Land Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 618,862 556,641
Construction, Land Development And Other Land Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 587,766 518,944
Construction, Land Development And Other Land Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 548 479
Construction, Land Development And Other Land Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 30,090 37,022
Construction, Land Development And Other Land Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 458 196
Construction, Land Development And Other Land Properties [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Aging [Abstract]    
Current 63,093 62,897
Nonaccrual 29 81
Subtotal 63,582 63,236
Construction, Land Development And Other Land Properties [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 460 199
Construction, Land Development And Other Land Properties [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 0 59
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Aging [Abstract]    
Current 1,600,192 1,595,557
Financing Receivable, Recorded Investment, Past Due 12,859 13,219
Nonaccrual 24,882 25,621
Total LHFI 1,637,933 1,634,397
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 1,515 2,367
Secured by 1-4 Family Residential Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 134,330 134,551
Secured by 1-4 Family Residential Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 125,262 125,203
Secured by 1-4 Family Residential Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 845 1,652
Secured by 1-4 Family Residential Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 8,097 7,483
Secured by 1-4 Family Residential Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 126 213
Secured by 1-4 Family Residential Properties [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Aging [Abstract]    
Current 1,470,417 1,465,355
Nonaccrual 21,178 21,695
Subtotal 1,503,603 1,499,846
Secured by 1-4 Family Residential Properties [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 10,493 10,429
Secured by 1-4 Family Residential Properties [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 1,515 2,367
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Aging [Abstract]    
Current 1,547,377 1,525,482
Financing Receivable, Recorded Investment, Past Due 628 1,994
Nonaccrual 19,030 25,717
Total LHFI 1,567,035 1,553,193
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 0 0
Secured by Nonfarm, Nonresidential Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,566,194 1,552,318
Secured by Nonfarm, Nonresidential Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,499,458 1,462,226
Secured by Nonfarm, Nonresidential Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,268 8,431
Secured by Nonfarm, Nonresidential Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 65,107 81,661
Secured by Nonfarm, Nonresidential Properties [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 361 0
Secured by Nonfarm, Nonresidential Properties [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Aging [Abstract]    
Current 841 875
Nonaccrual 0 0
Subtotal 841 875
Secured by Nonfarm, Nonresidential Properties [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 0 0
Secured by Nonfarm, Nonresidential Properties [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 0 0
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Aging [Abstract]    
Current 239,446 252,389
Financing Receivable, Recorded Investment, Past Due 0 80
Nonaccrual 610 1,318
Total LHFI 240,056 253,787
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 0 0
Other Real Estate Secured [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 238,259 251,380
Other Real Estate Secured [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 233,130 246,099
Other Real Estate Secured [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 255 306
Other Real Estate Secured [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 4,874 4,975
Other Real Estate Secured [Member] | Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 0 0
Other Real Estate Secured [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Aging [Abstract]    
Current 1,797 2,407
Nonaccrual 0 0
Subtotal 1,797 2,407
Other Real Estate Secured [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 0 0
Other Real Estate Secured [Member] | Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 0 0
Commercial and Industrial Loans [Member]    
Financing Receivable Aging [Abstract]    
Current 1,205,402 1,255,323
Financing Receivable, Recorded Investment, Past Due 1,871 2,923
Nonaccrual 12,411 12,104
Total LHFI 1,219,684 1,270,350
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 0 126
Commercial and Industrial Loans [Member] | Commercial LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,219,684 1,270,344
Commercial and Industrial Loans [Member] | Commercial LHFI [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 1,174,226 1,239,247
Commercial and Industrial Loans [Member] | Commercial LHFI [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 9,825 4,245
Commercial and Industrial Loans [Member] | Commercial LHFI [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 35,050 26,133
Commercial and Industrial Loans [Member] | Commercial LHFI [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 583 719
Commercial and Industrial Loans [Member] | Consumer LHFI [Member]    
Financing Receivable Aging [Abstract]    
Current 0 0
Nonaccrual 0 0
Subtotal 0 6
Commercial and Industrial Loans [Member] | Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 0 5
Commercial and Industrial Loans [Member] | Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 0 1
Consumer Loans [Member]    
Financing Receivable Aging [Abstract]    
Current 163,494 165,503
Financing Receivable, Recorded Investment, Past Due 1,677 2,373
Nonaccrual 44 88
Total LHFI 165,215 167,964
Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 256 211
Consumer Loans [Member] | Commercial LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 0 0
Consumer Loans [Member] | Commercial LHFI [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 0 0
Consumer Loans [Member] | Commercial LHFI [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 0 0
Consumer Loans [Member] | Commercial LHFI [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 0 0
Consumer Loans [Member] | Commercial LHFI [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 0 0
Consumer Loans [Member] | Consumer LHFI [Member]    
Financing Receivable Aging [Abstract]    
Current 163,495 165,504
Nonaccrual 43 87
Subtotal 165,215 167,964
Consumer Loans [Member] | Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 1,421 2,162
Consumer Loans [Member] | Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 256 211
State and Other Political Subdivision Loans [Member]    
Financing Receivable Aging [Abstract]    
Current 574,265 602,727
Financing Receivable, Recorded Investment, Past Due 0 0
Nonaccrual 0 0
Total LHFI 574,265 602,727
State and Other Political Subdivision Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 0 0
State and Other Political Subdivision Loans [Member] | Commercial LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 574,265 602,727
State and Other Political Subdivision Loans [Member] | Commercial LHFI [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 558,055 589,653
State and Other Political Subdivision Loans [Member] | Commercial LHFI [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 7,000 7,550
State and Other Political Subdivision Loans [Member] | Commercial LHFI [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 9,210 5,524
State and Other Political Subdivision Loans [Member] | Commercial LHFI [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 0 0
State and Other Political Subdivision Loans [Member] | Consumer LHFI [Member]    
Financing Receivable Aging [Abstract]    
Current 0 0
Nonaccrual 0 0
Subtotal 0 0
State and Other Political Subdivision Loans [Member] | Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 0 0
State and Other Political Subdivision Loans [Member] | Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 0 0
Other Loans [Member]    
Financing Receivable Aging [Abstract]    
Current 359,563 346,405
Financing Receivable, Recorded Investment, Past Due 305 141
Nonaccrual 573 628
Total LHFI 360,441 347,174
Other Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due [1] 0 0
Other Loans [Member] | Commercial LHFI [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 353,123 340,417
Other Loans [Member] | Commercial LHFI [Member] | Pass [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 351,708 338,598
Other Loans [Member] | Commercial LHFI [Member] | Special Mention [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 0 0
Other Loans [Member] | Commercial LHFI [Member] | Substandard [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 987 1,255
Other Loans [Member] | Commercial LHFI [Member] | Doubtful [Member]    
Financing Receivable [Abstract]    
Financing receivable commercial 428 564
Other Loans [Member] | Consumer LHFI [Member]    
Financing Receivable Aging [Abstract]    
Current 7,318 6,757
Nonaccrual 0 0
Subtotal 7,318 6,757
Other Loans [Member] | Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due 0 0
Other Loans [Member] | Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Aging [Abstract]    
Financing Receivable, Recorded Investment, Past Due $ 0 $ 0
[1] Past due 90 days or more but still accruing interest.