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Purchased Loans - Loan Portfolio Not Subject to Risk Rating (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Loan portfolio not subject to risk rating |  |
Total | $ 7,767,657 | $ 7,620,322
Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Total | 987,818 | 1,039,393
Real estate – construction |  |
Loan portfolio not subject to risk rating |  |
Total | 712,818 | 633,389
Real estate – 1-4 family mortgage |  |
Loan portfolio not subject to risk rating |  |
Total | 2,433,099 | 2,343,721
Real estate – commercial mortgage |  |
Loan portfolio not subject to risk rating |  |
Total | 3,461,174 | 3,427,530
Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Total | 172,748 | 176,289
Purchased loans |  |
Loan portfolio not subject to risk rating |  |
Total | 1,709,891 | 2,031,766
Purchased loans | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 447,237 | 520,075
Purchased loans | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 445,102 | 518,604
Purchased loans | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 2,135 | 1,471
Purchased loans | Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Total | 197,455 | 275,570
Purchased loans | Commercial, financial, agricultural | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 10,463 | 11,262
Purchased loans | Commercial, financial, agricultural | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 10,424 | 11,216
Purchased loans | Commercial, financial, agricultural | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 39 | 46
Purchased loans | Real estate – construction |  |
Loan portfolio not subject to risk rating |  |
Total | 70,438 | 85,731
Purchased loans | Real estate – construction | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 1,028 | 4,511
Purchased loans | Real estate – construction | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 1,028 | 4,511
Purchased loans | Real estate – construction | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 0 | 0
Purchased loans | Real estate – 1-4 family mortgage |  |
Loan portfolio not subject to risk rating |  |
Total | 520,649 | 614,187
Purchased loans | Real estate – 1-4 family mortgage | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 392,450 | 460,179
Purchased loans | Real estate – 1-4 family mortgage | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 390,746 | 459,038
Purchased loans | Real estate – 1-4 family mortgage | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 1,704 | 1,141
Purchased loans | Real estate – commercial mortgage |  |
Loan portfolio not subject to risk rating |  |
Total | 906,219 | 1,037,454
Purchased loans | Real estate – commercial mortgage | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 30,352 | 27,618
Purchased loans | Real estate – commercial mortgage | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 30,234 | 27,495
Purchased loans | Real estate – commercial mortgage | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 118 | 123
Purchased loans | Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Total | 15,130 | 18,824
Purchased loans | Installment loans to individuals | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total | 12,944 | 16,505
Purchased loans | Installment loans to individuals | Performing |  |
Loan portfolio not subject to risk rating |  |
Total | 12,670 | 16,344
Purchased loans | Installment loans to individuals | Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Total | $ 274 | $ 161

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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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