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Purchased Loans - Loan Portfolio by Risk-Rating Grades (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Loan portfolio by risk-rating grades |  |
Total | $ 7,698,070 | $ 7,620,322
Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 1,046,818 | 1,039,393
Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 657,491 | 633,389
Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 2,358,101 | 2,343,721
Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 3,463,953 | 3,427,530
Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 171,707 | 176,289
Purchased loans |  |
Loan portfolio by risk-rating grades |  |
Total | 1,867,948 | 2,031,766
Purchased loans | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 1,168,137 | 1,284,431
Purchased loans | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 1,120,830 | 1,241,834
Purchased loans | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 24,967 | 24,595
Purchased loans | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 22,340 | 18,002
Purchased loans | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 243,672 | 275,570
Purchased loans | Commercial, financial, agricultural | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 219,152 | 248,993
Purchased loans | Commercial, financial, agricultural | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 208,150 | 241,195
Purchased loans | Commercial, financial, agricultural | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 5,116 | 4,974
Purchased loans | Commercial, financial, agricultural | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 5,886 | 2,824
Purchased loans | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 75,061 | 85,731
Purchased loans | Real estate – construction | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 73,011 | 81,220
Purchased loans | Real estate – construction | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 70,974 | 81,220
Purchased loans | Real estate – construction | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 1,537 | 0
Purchased loans | Real estate – construction | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 500 | 0
Purchased loans | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 572,830 | 614,187
Purchased loans | Real estate – 1-4 family mortgage | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 94,018 | 100,039
Purchased loans | Real estate – 1-4 family mortgage | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 85,590 | 91,369
Purchased loans | Real estate – 1-4 family mortgage | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 2,525 | 2,498
Purchased loans | Real estate – 1-4 family mortgage | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 5,903 | 6,172
Purchased loans | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 960,273 | 1,037,454
Purchased loans | Real estate – commercial mortgage | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 781,291 | 853,498
Purchased loans | Real estate – commercial mortgage | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 755,454 | 827,372
Purchased loans | Real estate – commercial mortgage | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 15,789 | 17,123
Purchased loans | Real estate – commercial mortgage | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 10,048 | 9,003
Purchased loans | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 16,112 | 18,824
Purchased loans | Installment loans to individuals | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 665 | 681
Purchased loans | Installment loans to individuals | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 662 | 678
Purchased loans | Installment loans to individuals | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 0 | 0
Purchased loans | Installment loans to individuals | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | $ 3 | $ 3

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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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