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Purchased Loans - Loan Portfolio Not Subject to Risk Rating (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Loan portfolio not subject to risk rating |  |
Total | $ 7,448,608 | $ 6,202,709
Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Total | 1,008,935 | 717,490
Real estate – construction |  |
Loan portfolio not subject to risk rating |  |
Total | 577,720 | 552,679
Real estate – 1-4 family mortgage |  |
Loan portfolio not subject to risk rating |  |
Total | 2,295,852 | 1,878,177
Real estate – commercial mortgage |  |
Loan portfolio not subject to risk rating |  |
Total | 3,390,389 | 2,898,895
Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Total | 175,712 | 155,468
Purchased loans |  |
Loan portfolio not subject to risk rating |  |
Total | 2,155,141 | 1,489,137
Purchased loans | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 545,689 | 316,127
Purchased loans | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 543,727 | 313,852
Purchased loans | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 1,962 | 2,275
Purchased loans | Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Total | 301,100 | 128,200
Purchased loans | Commercial, financial, agricultural | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 10,799 | 9,568
Purchased loans | Commercial, financial, agricultural | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 10,741 | 9,489
Purchased loans | Commercial, financial, agricultural | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 58 | 79
Purchased loans | Real estate – construction |  |
Loan portfolio not subject to risk rating |  |
Total | 100,082 | 68,753
Purchased loans | Real estate – construction | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 7,257 | 4,067
Purchased loans | Real estate – construction | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 7,257 | 3,601
Purchased loans | Real estate – construction | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 0 | 466
Purchased loans | Real estate – 1-4 family mortgage |  |
Loan portfolio not subject to risk rating |  |
Total | 651,792 | 452,447
Purchased loans | Real estate – 1-4 family mortgage | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 480,689 | 267,201
Purchased loans | Real estate – 1-4 family mortgage | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 479,069 | 265,697
Purchased loans | Real estate – 1-4 family mortgage | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 1,620 | 1,504
Purchased loans | Real estate – commercial mortgage |  |
Loan portfolio not subject to risk rating |  |
Total | 1,079,049 | 823,758
Purchased loans | Real estate – commercial mortgage | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 26,210 | 21,411
Purchased loans | Real estate – commercial mortgage | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 26,088 | 21,353
Purchased loans | Real estate – commercial mortgage | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 122 | 58
Purchased loans | Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Total | 23,118 | 15,979
Purchased loans | Installment loans to individuals | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 20,734 | 13,880
Purchased loans | Installment loans to individuals | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 20,572 | 13,712
Purchased loans | Installment loans to individuals | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | $ 162 | $ 168

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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://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=82891408&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=84173941&loc=d3e5074-111524 + Details
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