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Non Purchased Loans - (Details 6) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loan portfolio by risk-rating grades
Total	$ 6,235,805	$ 6,202,709
Commercial, financial, agricultural
Loan portfolio by risk-rating grades
Total	741,466	717,490
Real estate – construction
Loan portfolio by risk-rating grades
Total	413,734	552,679
Real estate – 1-4 family mortgage
Loan portfolio by risk-rating grades
Total	1,917,567	1,878,177
Real estate – commercial mortgage
Loan portfolio by risk-rating grades
Total	3,008,429	2,898,895
Installment loans to individuals
Loan portfolio by risk-rating grades
Total	154,609	155,468
Non purchased loans and leases
Loan portfolio by risk-rating grades
Total	4,834,085	4,713,572
Non purchased loans and leases | Internal Noninvestment Grade
Loan portfolio by risk-rating grades
Total	2,908,235	2,808,367
Non purchased loans and leases | Internal Noninvestment Grade | Commercial, financial, agricultural
Loan portfolio by risk-rating grades
Total	473,760	439,704
Non purchased loans and leases | Internal Noninvestment Grade | Lease financing
Loan portfolio by risk-rating grades
Total	0	0
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – construction
Loan portfolio by risk-rating grades
Total	329,547	402,549
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – 1-4 family mortgage
Loan portfolio by risk-rating grades
Total	214,895	200,385
Non purchased loans and leases | Internal Noninvestment Grade | Real estate – commercial mortgage
Loan portfolio by risk-rating grades
Total	1,890,033	1,765,729
Non purchased loans and leases | Internal Noninvestment Grade | Installment loans to individuals
Loan portfolio by risk-rating grades
Total	0	0
Non purchased loans and leases | Pass
Loan portfolio by risk-rating grades
Total	2,865,371	2,761,884
Non purchased loans and leases | Pass | Commercial, financial, agricultural
Loan portfolio by risk-rating grades
Total	470,252	434,323
Non purchased loans and leases | Pass | Lease financing
Loan portfolio by risk-rating grades
Total	0	0
Non purchased loans and leases | Pass | Real estate – construction
Loan portfolio by risk-rating grades
Total	329,322	402,156
Non purchased loans and leases | Pass | Real estate – 1-4 family mortgage
Loan portfolio by risk-rating grades
Total	205,083	190,882
Non purchased loans and leases | Pass | Real estate – commercial mortgage
Loan portfolio by risk-rating grades
Total	1,860,714	1,734,523
Non purchased loans and leases | Pass | Installment loans to individuals
Loan portfolio by risk-rating grades
Total	0	0
Non purchased loans and leases | Watch
Loan portfolio by risk-rating grades
Total	22,076	26,416
Non purchased loans and leases | Watch | Commercial, financial, agricultural
Loan portfolio by risk-rating grades
Total	1,846	4,531
Non purchased loans and leases | Watch | Lease financing
Loan portfolio by risk-rating grades
Total	0	0
Non purchased loans and leases | Watch | Real estate – construction
Loan portfolio by risk-rating grades
Total	225	393
Non purchased loans and leases | Watch | Real estate – 1-4 family mortgage
Loan portfolio by risk-rating grades
Total	3,739	3,374
Non purchased loans and leases | Watch | Real estate – commercial mortgage
Loan portfolio by risk-rating grades
Total	16,266	18,118
Non purchased loans and leases | Watch | Installment loans to individuals
Loan portfolio by risk-rating grades
Total	0	0
Non purchased loans and leases | Substandard
Loan portfolio by risk-rating grades
Total	20,788	20,067
Non purchased loans and leases | Substandard | Commercial, financial, agricultural
Loan portfolio by risk-rating grades
Total	1,662	850
Non purchased loans and leases | Substandard | Lease financing
Loan portfolio by risk-rating grades
Total	0	0
Non purchased loans and leases | Substandard | Real estate – construction
Loan portfolio by risk-rating grades
Total	0	0
Non purchased loans and leases | Substandard | Real estate – 1-4 family mortgage
Loan portfolio by risk-rating grades
Total	6,073	6,129
Non purchased loans and leases | Substandard | Real estate – commercial mortgage
Loan portfolio by risk-rating grades
Total	13,053	13,088
Non purchased loans and leases | Substandard | Installment loans to individuals
Loan portfolio by risk-rating grades
Total	$ 0	$ 0

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Loan portfolio by risk rating grades.

+ References

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes 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 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

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