Loans and Allowance for Loan Losses - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable Including Other Real Estate Owned [Line Items]
Unearned income	$ 269,800	$ 248,100
Unamortized deferred costs	315,400	244,100
Unamortized purchase discounts	39,500	110,600
Commercial, financial and agricultural	26,022,374	23,828,537
Loans pledged to secure deposits and FHLB advances and for other purposes as required or permitted by law	14,200,000
Loans held for sale classified as TDR, amount	0	0
Commitment to lend additional funds to borrowers whose terms have been modified in a TDR	5,700	1,100
Other real estate owned	20,862	20,600
Residential real estate loans secured by residential real estate properties for which formal foreclosure proceedings were in process	30,000	26,000
Energy
Accounts, Notes, Loans and Financing Receivable Including Other Real Estate Owned [Line Items]
Commercial, financial and agricultural	3,800,000	3,600,000
Interest Rate Concession [Member]
Accounts, Notes, Loans and Financing Receivable Including Other Real Estate Owned [Line Items]
Post modification outstanding, recorded investment	4,400	10,900
Modification of Loan Structure [Member]
Accounts, Notes, Loans and Financing Receivable Including Other Real Estate Owned [Line Items]
Post modification outstanding, recorded investment	$ 21,800	36,500
FDIC loss sharing agreement
Accounts, Notes, Loans and Financing Receivable Including Other Real Estate Owned [Line Items]
FDIC loss sharing agreement, term	10 years
FDIC loss sharing agreement \| Commercial Loan
Accounts, Notes, Loans and Financing Receivable Including Other Real Estate Owned [Line Items]
FDIC loss sharing agreement, term	5 years
FDIC loss sharing agreement \| Single Family Residential Loan
Accounts, Notes, Loans and Financing Receivable Including Other Real Estate Owned [Line Items]
FDIC loss sharing agreement, term	10 years
Residential real estate
Accounts, Notes, Loans and Financing Receivable Including Other Real Estate Owned [Line Items]
Other real estate owned	$ 17,000	$ 11,000

FDIC Indemnification Asset, Term Of Loss Sharing Agreement

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- Definition

Loans Held-For-Sale, Classified as Troubled Debt Restructuring

+ References

No definition available.

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- Definition

Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Includes amounts for loans and leases covered under loss sharing agreements.

+ References

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- Definition

Loans and Leases Receivable, Unamortized Deferred Costs

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No definition available.

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Loans and Leases Receivable, Unamortized Discounts and Premiums

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No definition available.

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

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- Definition

Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

+ References

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-Name Accounting Standards Codification
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-Section 50
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- Definition

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
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Amount before allowance of loans issued to agricultural, commercial and industrial, and financial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

Reference 1: 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(a)(1))
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- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 35
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- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5162-111524

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-Name Regulation S-X (SX)
-Number 210
-Section 28
-Article 12

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-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph c
-Subparagraph Schedule III
-Article 5

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