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Non Purchased Loans - Loan Portfolio Not Subject to Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loan portfolio not subject to risk rating
Total	$ 9,122,907	$ 7,620,322
Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Total	1,313,344	1,039,393
Real estate – construction
Loan portfolio not subject to risk rating
Total	736,985	633,389
Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Total	2,762,683	2,343,721
Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Total	4,112,585	3,427,530
Installment loans to individuals
Loan portfolio not subject to risk rating
Total	197,310	176,289
Non purchased loans and leases
Loan portfolio not subject to risk rating
Total	6,210,238	5,588,556
Non purchased loans and leases | Performing and Nonperforming
Loan portfolio not subject to risk rating
Total	2,457,250	2,210,289
Non purchased loans and leases | Performing and Nonperforming | Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Total	204,009	192,982
Non purchased loans and leases | Performing and Nonperforming | Lease financing
Loan portfolio not subject to risk rating
Total	54,272	54,013
Non purchased loans and leases | Performing and Nonperforming | Real estate – construction
Loan portfolio not subject to risk rating
Total	66,353	63,417
Non purchased loans and leases | Performing and Nonperforming | Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Total	1,695,749	1,465,689
Non purchased loans and leases | Performing and Nonperforming | Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Total	334,442	331,657
Non purchased loans and leases | Performing and Nonperforming | Installment loans to individuals
Loan portfolio not subject to risk rating
Total	102,425	102,531
Non purchased loans and leases | Performing
Loan portfolio not subject to risk rating
Total	2,449,712	2,203,941
Non purchased loans and leases | Performing | Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Total	202,633	191,473
Non purchased loans and leases | Performing | Lease financing
Loan portfolio not subject to risk rating
Total	54,272	53,854
Non purchased loans and leases | Performing | Real estate – construction
Loan portfolio not subject to risk rating
Total	66,353	63,417
Non purchased loans and leases | Performing | Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Total	1,690,667	1,462,347
Non purchased loans and leases | Performing | Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Total	333,452	330,441
Non purchased loans and leases | Performing | Installment loans to individuals
Loan portfolio not subject to risk rating
Total	102,335	102,409
Non purchased loans and leases | Non- Performing
Loan portfolio not subject to risk rating
Total	7,538	6,348
Non purchased loans and leases | Non- Performing | Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Total	1,376	1,509
Non purchased loans and leases | Non- Performing | Lease financing
Loan portfolio not subject to risk rating
Total	0	159
Non purchased loans and leases | Non- Performing | Real estate – construction
Loan portfolio not subject to risk rating
Total	0	0
Non purchased loans and leases | Non- Performing | Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Total	5,082	3,342
Non purchased loans and leases | Non- Performing | Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Total	990	1,216
Non purchased loans and leases | Non- Performing | Installment loans to individuals
Loan portfolio not subject to risk rating
Total	$ 90	$ 122

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- Definition

Loan portfolio not subject to risk rating.

+ References

No definition available.

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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