Loans and Allowance for Loan Losses - Composition of loan portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Commercial loans:
Commercial, financial and agricultural	$ 26,022,374	$ 23,828,537
Real estate – construction	2,354,253	2,154,652
Commercial real estate – mortgage	10,453,280	9,877,206
Total commercial loans	38,829,907	35,860,395
Consumer loans:
Residential real estate – mortgage	13,993,285	13,922,656
Equity lines of credit	2,419,815	2,304,784
Equity loans	580,804	634,968
Credit card	627,359	630,456
Consumer direct	936,871	652,927
Consumer indirect	3,495,082	2,870,408
Total consumer loans	22,053,216	21,016,199
Covered loans	440,961	495,190
Total loans	$ 61,324,084	$ 57,371,784

Loans And Leases Receivable, Gross, Covered And Not Covered

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Loans and Lease Receivable, Gross, Consumer, Direct Consumer Loan

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Loans and Lease Receivable, Gross, Consumer, Equity Lines of Credit

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Loans and Lease Receivable, Gross, Consumer, Equity Loans

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Loans and Lease Receivable, Gross, Consumer, Indirect Consumer Loan

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Amount before allowance of commercial loans and leases receivable includes, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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-Subparagraph (SX 210.9-03.7(a),(b))
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Amount before allowance of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of consumer mortgage. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes subordinated loans such as home equity lines of credit and loans and leases covered under loss sharing agreements.

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Amount before allowance of credit card loans issued to individuals. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements.

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Amount before allowance of commercial construction loans. 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.

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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.

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Amount before allowance of mortgage loans on existing land or building. 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.

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