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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Loan Portfolio [Abstract] |  |
Total LHFI | $ 6,447,073 | $ 6,449,469
Less allowance for loan losses, LHFI | 71,166 | 69,616
Net LHFI | 6,375,907 | 6,379,853
Loans and Leases Receivable, Other Information [Abstract] |  |
LHFI, Individually Evaluated For Impairment | 68,438 | 79,343
LHFI, Collectively Evaluated For Impairment | 6,378,635 | 6,370,126
Total LHFI | 6,447,073 | 6,449,469
Construction, Land Development And Other Land Properties [Member] | Loans Secured by Real Estate [Member] |  |
Loan Portfolio [Abstract] |  |
Total LHFI | 682,444 | 619,877
Loans and Leases Receivable, Other Information [Abstract] |  |
LHFI, Individually Evaluated For Impairment | 10,888 | 13,867
LHFI, Collectively Evaluated For Impairment | 671,556 | 606,010
Total LHFI | 682,444 | 619,877
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] |  |
Loan Portfolio [Abstract] |  |
Total LHFI | 1,637,933 | 1,634,397
Loans and Leases Receivable, Other Information [Abstract] |  |
LHFI, Individually Evaluated For Impairment | 24,882 | 25,621
LHFI, Collectively Evaluated For Impairment | 1,613,051 | 1,608,776
Total LHFI | 1,637,933 | 1,634,397
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] |  |
Loan Portfolio [Abstract] |  |
Total LHFI | 1,567,035 | 1,553,193
Loans and Leases Receivable, Other Information [Abstract] |  |
LHFI, Individually Evaluated For Impairment | 19,030 | 25,717
LHFI, Collectively Evaluated For Impairment | 1,548,005 | 1,527,476
Total LHFI | 1,567,035 | 1,553,193
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] |  |
Loan Portfolio [Abstract] |  |
Total LHFI | 240,056 | 253,787
Loans and Leases Receivable, Other Information [Abstract] |  |
LHFI, Individually Evaluated For Impairment | 610 | 1,318
LHFI, Collectively Evaluated For Impairment | 239,446 | 252,469
Total LHFI | 240,056 | 253,787
Commercial and Industrial Loans [Member] |  |
Loan Portfolio [Abstract] |  |
Total LHFI | 1,219,684 | 1,270,350
Loans and Leases Receivable, Other Information [Abstract] |  |
LHFI, Individually Evaluated For Impairment | 12,411 | 12,104
LHFI, Collectively Evaluated For Impairment | 1,207,273 | 1,258,246
Total LHFI | 1,219,684 | 1,270,350
Consumer Loans [Member] |  |
Loan Portfolio [Abstract] |  |
Total LHFI | 165,215 | 167,964
Loans and Leases Receivable, Other Information [Abstract] |  |
LHFI, Individually Evaluated For Impairment | 44 | 88
LHFI, Collectively Evaluated For Impairment | 165,171 | 167,876
Total LHFI | 165,215 | 167,964
State and Other Political Subdivision Loans [Member] |  |
Loan Portfolio [Abstract] |  |
Total LHFI | 574,265 | 602,727
Loans and Leases Receivable, Other Information [Abstract] |  |
LHFI, Individually Evaluated For Impairment | 0 | 0
LHFI, Collectively Evaluated For Impairment | 574,265 | 602,727
Total LHFI | 574,265 | 602,727
Other Loans [Member] |  |
Loan Portfolio [Abstract] |  |
Total LHFI | 360,441 | 347,174
Loans and Leases Receivable, Other Information [Abstract] |  |
LHFI, Individually Evaluated For Impairment | 573 | 628
LHFI, Collectively Evaluated For Impairment | 359,868 | 346,546
Total LHFI | $ 360,441 | $ 347,174

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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